initial code commit

LICENSE

@@ -1,6 +1,7 @@
+/*
    The MIT License (MIT)
 
-Copyright (c) 2014 trapexit
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
 
    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
@@ -9,13 +10,14 @@ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:
 
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
 
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/

Makefile

@@ -0,0 +1,60 @@
+# The MIT License (MIT)
+#
+# Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+SRC	=	$(wildcard src/*.cpp)
+OBJ	=	$(SRC:src/%.cpp=obj/%.o)
+DEPS	=	$(OBJ:obj/%.o=obj/%.d)
+TARGET	=	mergerfs
+CFLAGS	=	-g -Wall \
+		$(shell pkg-config fuse --cflags) \
+		-DFUSE_USE_VERSION=26 \
+		-MMD
+
+ifdef WITHOUT_XATTR
+CFLAGS	+=  	-DWITHOUT_XATTR
+endif
+
+LDFLAGS	=	$(shell pkg-config fuse --libs)
+
+all: $(TARGET)
+
+help:
+	@echo usage: make
+	@echo make WITHOUT_XATTR=1 - to build program without xattrs functionality
+
+$(TARGET): obj/obj-stamp $(OBJ)
+	g++ $(CFLAGS) $(OBJ) -o $@ $(LDFLAGS)
+
+obj/obj-stamp:
+	mkdir -p obj
+	touch $@
+
+obj/%.o: src/%.cpp
+	g++ $(CFLAGS) -c $< -o $@
+
+clean:
+	rm -rf obj "$(TARGET)"
+	find -name "*~" -delete
+
+.PHONY: all clean help
+
+include $(wildcard obj/*.d)

README.md

@@ -1,4 +1,101 @@
 mergerfs
 ========
 
-a FUSE union filesystem
+another FUSE union filesystem
+
+mergerfs is similar to mhddfs, unionfs, and aufs. Like mhddfs in that it too uses FUSE. Like aufs in that it provides multiple policies for how to handle behavior.
+
+Why create mergerfs when those exist? mhddfs isn't really maintained or flexible. There are also issues with running as root. aufs is more flexible but contains some hard to debug inconsistencies in behavior. Neither support file attributes ([chattr](http://linux.die.net/man/1/chattr)).
+
+Policies
+========
+
+Filesystem calls are broken up into 5 classes of policies: search, action, create, statfs, and none.
+
+Below shows each policy class, the FUSE calls they impact, and the policy names.
+
+####Policy classifications####
+| Class | FUSE calls | Policies |
+|-------|------------|----------|
+| search | access, getattr, getxattr, listxattr, open, readlink  | First Found (ff), First Found w/ Permission (ffwp), Newest (newest) |
+| action | chmod, link, removexattr, rmdir, setxattr, truncate, unlink, utimens | First Found (ff), First Found w/ Permission (ffwp), Newest (newest), All Found (all) |
+| create | create, mkdir, mknod | Existing Path (ep), Most Free Space (mfs), Existing Path Most Free Space (epmfs), Random (rand) |
+| statfs | statfs | Sum Used Max Free (sumf), Sum Used Sum Free (susf) |
+| none   | fallocate, fsync, ftruncate, ioctl, read, readdir, rename, symlink, write, release | |
+
+####Descriptions####
+| Class/Policy | Description |
+|--------------|-------------|
+| search/ff | Given the order the paths were provided at mount time act on the first one found (regardless if stat would return EACCES). |
+| search/ffwp | Given the order the paths were provided at mount time act on the first one found which you have access (stat does not error with EACCES). |
+| search/newest | If multiple files exist return the one with the most recent mtime. |
+| action/ff | (same as search/ff) |
+| action/ffwp | (same as search/ffwp) |
+| action/newest | (same as search/newest) |
+| action/all | Attempt to apply the call to each file found. If any sub call succeeds the entire operation succeeds and other errors ignored. If all fail then the last error is reported. |
+| create/ep | Choose the first path which is found. |
+| create/mfs | Assuming the path is found to exist (ENOENT would not be returned) use the drive with the most free space available. |
+| create/epmfs | If the path exists in multiple locations use the one with the most free space. Otherwise fall back to mfs. |
+| create/rand | Pick a destination at random. Again the dirname of the full path must exist somewhere. |
+| statfs/sumf | When reporting the size of the filesystem it will show the sum of all used but the available space will be reported as the max available across the filesystems mounted. |
+| statfs/susf | As above but will report the sum of available space. Since the largest usable space is that of the filesystem with the most usable space this option is deceptive. |
+
+**NOTE:** create is really a search for existence and then create. The 'search' policy applies to the first part. If the [dirname](http://linux.die.net/man/3/dirname) of the full path is not found to exist [ENOENT](http://linux.die.net/man/3/errno) is returned.
+
+Usage
+=====
+
+```
+$ mergerfs -o create=epmfs,search=ff,action=ff,statfs=sumf <mountpoint> <dir0>:<dir1>:<dir2>
+```
+
+| Option | Values | Default |
+|--------|--------|---------|
+| search | ff, ffwp, newest | ff |
+| action | ff, ffwp, newest, all | ff |
+| create | ep, mfs, epmfs, rand | epmfs |
+| statfs | sumf, susf | sumf |
+
+Building
+========
+
+Need to install FUSE development libraries.
+
+
+```
+[trapexit:~/dev/mergerfs] $ make help
+usage: make
+make WITHOUT_XATTR=1 - to build program without xattrs functionality
+```
+
+Runtime Settings
+================
+
+```
+<mountpoint>/.mergerfs
+```
+
+There is a pseudo file available at the mountpoint which currently allows for the runtime modification of policies. The file will not show up in readdirs but can be stat'ed, read, and writen. Most other calls will fail with EPERM, EINVAL, or whatever may be appropriate for that call. Anything not understood while writing will result in EINVAL otherwise the number of bytes written will be returned.
+
+Reading the file will result in a newline delimited list of current settings as followed:
+
+```
+[trapexit:/tmp/mount] $ cat .mergerfs
+action=ff
+create=epmfs
+search=ff
+statfs=sumf
+```
+
+Writing to the file is buffered and waits till a newline to process. Meaning echo works well.
+
+```
+[trapexit:/tmp/mount] $ echo "search=newest" >> .mergerfs
+[trapexit:/tmp/mount] $ cat .mergerfs
+action=ff
+create=epmfs
+search=newest
+statfs=sumf
+```
+
+*NOTE:* offset is not supported and ignored in both read and write. There is also a safety check which limits buffered + incoming length to a max of 1024 bytes.

TODO

@@ -0,0 +1,10 @@
+* logging
+* dynamic changing of source mounts
+* policies for readdir
+  * first found
+  * all found
+  * all found w/ permission
+  * newest
+* unit tests
+* add more to ioctl
+* use {list,set}xattr for setting runtime values via .mergerfs pseudofile

src/access.cpp

@@ -0,0 +1,85 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <fuse.h>
+
+#include <string>
+#include <vector>
+
+#include <unistd.h>
+#include <errno.h>
+
+#include "ugid.hpp"
+#include "fs.hpp"
+#include "config.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_access(const Policy::Search::Func  searchFunc,
+        const vector<string>       &srcmounts,
+        const string                fusepath,
+        const int                   mask)
+{
+  int rv;
+  string path;
+
+  path = searchFunc(srcmounts,fusepath).full;
+  if(path.empty())
+    return -ENOENT;
+
+  rv = ::eaccess(path.c_str(),mask);
+
+  return ((rv == -1) ? -errno : 0);
+}
+
+namespace mergerfs
+{
+  namespace access
+  {
+    int
+    access(const char *fusepath,
+           int         mask)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return 0;
+
+      return _access(config.policy.search,
+                     config.srcmounts,
+                     fusepath,
+                     mask);
+    }
+  }
+}

src/access.hpp

@@ -0,0 +1,33 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace access
+  {
+    int
+    access(const char *fusepath,
+           int         mask);
+  }
+}

src/assert.hpp

@@ -0,0 +1,36 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#define STATIC_ASSERT(cond) assert::StaticAssert< (cond) >()
+#define STATIC_ARRAYLENGTH_ASSERT(array,size) STATIC_ASSERT(((sizeof(array)/sizeof(array[0]))==(size)))
+
+namespace assert
+{
+  template<bool>
+  struct StaticAssert;
+
+  template<>
+  struct StaticAssert<true>
+  {};
+}

src/chmod.cpp

@@ -0,0 +1,88 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <errno.h>
+#include <string>
+#include <vector>
+
+#include "ugid.hpp"
+#include "fs.hpp"
+#include "config.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_chmod(const Policy::Action::Func  searchFunc,
+       const vector<string>       &srcmounts,
+       const string                fusepath,
+       const mode_t                mode)
+{
+  int rv;
+  int error;
+  vector<fs::Path> paths;
+
+  searchFunc(srcmounts,fusepath,paths);
+  if(paths.empty())
+    return -ENOENT;
+
+  rv    = -1;
+  error =  0;
+  for(vector<fs::Path>::const_iterator
+        i = paths.begin(), ei = paths.end(); i != ei; ++i)
+    {
+      rv &= ::chmod(i->full.c_str(),mode);
+      if(rv == -1)
+        error = errno;
+    }
+
+  return ((rv == -1) ? -error : 0);
+}
+
+namespace mergerfs
+{
+  namespace chmod
+  {
+    int
+    chmod(const char *fusepath,
+          mode_t      mode)
+    {
+      ugid::SetResetGuard   ugid;
+      const config::Config &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return -EPERM;
+
+      return _chmod(config.policy.action,
+                    config.srcmounts,
+                    fusepath,
+                    mode);
+    }
+  }
+}

src/chmod.hpp

@@ -0,0 +1,33 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace chmod
+  {
+    int
+    chmod(const char *fusepath,
+          mode_t      mode);
+  }
+}

src/chown.cpp

@@ -0,0 +1,92 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <errno.h>
+
+#include <string>
+#include <vector>
+
+#include "ugid.hpp"
+#include "fs.hpp"
+#include "config.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_chown(const Policy::Action::Func  searchFunc,
+       const vector<string>       &srcmounts,
+       const string                fusepath,
+       const uid_t                 uid,
+       const gid_t                 gid)
+{
+  int rv;
+  int error;
+  vector<fs::Path> paths;
+
+  searchFunc(srcmounts,fusepath,paths);
+  if(paths.empty())
+    return -ENOENT;
+
+  rv    = -1;
+  error =  0;
+  for(vector<fs::Path>::const_iterator
+        i = paths.begin(), ei = paths.end(); i != ei; ++i)
+    {
+      rv &= ::lchown(i->full.c_str(),uid,gid);
+      if(rv == -1)
+        error = errno;
+    }
+
+  return ((rv == -1) ? -error : 0);
+}
+
+namespace mergerfs
+{
+  namespace chown
+  {
+    int
+    chown(const char *fusepath,
+          uid_t       uid,
+          gid_t       gid)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return -EPERM;
+
+      return _chown(config.policy.action,
+                    config.srcmounts,
+                    fusepath,
+                    uid,
+                    gid);
+    }
+  }
+}

src/chown.hpp

@@ -0,0 +1,34 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace chown
+  {
+    int
+    chown(const char *fusepath,
+          uid_t       uid,
+          gid_t       gid);
+  }
+}

src/config.cpp

@@ -0,0 +1,91 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <sstream>
+
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include "config.hpp"
+
+namespace mergerfs
+{
+  namespace config
+  {
+    Config::Config()
+      : controlfile("/.mergerfs"),
+        testmode(false)
+    {
+      time_t now = time(NULL);
+
+      controlfilestat.st_dev     = 0;
+      controlfilestat.st_ino     = 0;
+      controlfilestat.st_mode    = (S_IFREG|S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
+      controlfilestat.st_nlink   = 1;
+      controlfilestat.st_uid     = ::getuid();
+      controlfilestat.st_gid     = ::getgid();
+      controlfilestat.st_rdev    = 0;
+      controlfilestat.st_size    = 0;
+      controlfilestat.st_blksize = 1024;
+      controlfilestat.st_blocks  = 0;
+      controlfilestat.st_atime   = now;
+      controlfilestat.st_mtime   = now;
+      controlfilestat.st_ctime   = now;
+    }
+
+    std::string
+    Config::generateReadStr() const
+    {
+      std::stringstream ss;
+
+      ss << "action=" << policy.action.str() << std::endl
+         << "create=" << policy.create.str() << std::endl
+         << "search=" << policy.search.str() << std::endl
+         << "statfs=" << policy.statfs.str() << std::endl;
+
+      return ss.str();
+    }
+
+    void
+    Config::updateReadStr()
+    {
+      readstr                 = generateReadStr();
+      controlfilestat.st_size = readstr.size();
+    }
+
+    const Config&
+    get(void)
+    {
+      return (*((Config*)fuse_get_context()->private_data));
+    }
+
+    Config&
+    get_writable(void)
+    {
+      return (*((Config*)fuse_get_context()->private_data));
+    }
+  }
+}

src/config.hpp

@@ -0,0 +1,64 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#ifndef __CONFIG_HPP__
+#define __CONFIG_HPP__
+
+#include <sys/stat.h>
+
+#include <string>
+#include <vector>
+
+#include "policy.hpp"
+
+namespace mergerfs
+{
+  namespace config
+  {
+    class Config
+    {
+    public:
+      Config();
+
+      std::string generateReadStr() const;
+      void        updateReadStr();
+
+    public:
+      std::string              destmount;
+      std::vector<std::string> srcmounts;
+      Policy                   policy;
+
+      const std::string        controlfile;
+      struct stat              controlfilestat;
+      std::string              readstr;
+
+      bool                     testmode;
+    };
+
+    const Config &get(void);
+    Config       &get_writable(void);
+  }
+}
+
+#endif

src/create.cpp

@@ -0,0 +1,115 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <string>
+#include <vector>
+
+#include "config.hpp"
+#include "ugid.hpp"
+#include "fileinfo.hpp"
+#include "fs.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::FileInfo;
+using mergerfs::Policy;
+
+static
+int
+_create_controlfile(uint64_t &fh)
+{
+  fh = (uint64_t)new string;
+
+  return 0;
+}
+
+static
+int
+_create(const Policy::Search::Func  searchFunc,
+        const Policy::Create::Func  createPathFunc,
+        const vector<string>       &srcmounts,
+        const string                fusepath,
+        const mode_t                mode,
+        const int                   flags,
+        uint64_t                   &fh)
+{
+  int fd;
+  string path;
+  string dirname;
+  fs::Path createpath;
+  fs::Path existingpath;
+
+  dirname      = fs::dirname(fusepath);
+  existingpath = searchFunc(srcmounts,dirname);
+  if(existingpath.base.empty())
+    return -ENOENT;
+
+  createpath = createPathFunc(srcmounts,dirname);
+  if(createpath.base != existingpath.base)
+    fs::clonepath(existingpath.base,createpath.base,dirname);
+
+  path = fs::make_path(createpath.base,fusepath);
+
+  fd = ::open(path.c_str(),flags,mode);
+  if(fd == -1)
+    return -errno;
+
+  fh = (uint64_t)new FileInfo(fd,flags,path);
+
+  return 0;
+}
+
+namespace mergerfs
+{
+  namespace create
+  {
+    int
+    create(const char            *fusepath,
+           mode_t                 mode,
+           struct fuse_file_info *fileinfo)
+    {
+      ugid::SetResetGuard   ugid;
+      const config::Config &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return _create_controlfile(fileinfo->fh);
+
+      return _create(config.policy.search,
+                     config.policy.create,
+                     config.srcmounts,
+                     fusepath,
+                     mode,
+                     fileinfo->flags,
+                     fileinfo->fh);
+    }
+  }
+}

src/create.hpp

@@ -0,0 +1,37 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <sys/types.h>
+#include <fuse.h>
+
+namespace mergerfs
+{
+  namespace create
+  {
+    int
+    create(const char            *fusepath,
+           mode_t                 mode,
+           struct fuse_file_info *fileinfo);
+  }
+}

src/fallocate.cpp

@@ -0,0 +1,93 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <fuse.h>
+
+#include <errno.h>
+#include <fcntl.h>
+
+#include "ugid.hpp"
+#include "config.hpp"
+#include "fileinfo.hpp"
+
+using namespace mergerfs;
+
+static
+int
+_fallocate(const int   fd,
+           const int   mode,
+           const off_t offset,
+           const off_t len)
+{
+  int rv;
+
+#ifdef _GNU_SOURCE
+  rv = ::fallocate(fd,mode,offset,len);
+#elif defined _XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L
+  if(mode)
+    {
+      rv = -1;
+      errno = EOPNOTSUPP;
+    }
+  else
+    {
+      rv = ::posix_fallocate(fd,offset,len);
+    }
+#else
+  rv = -1;
+  errno = EOPNOTSUPP;
+#endif
+
+  return ((rv == -1) ? -errno : 0);
+}
+
+namespace mergerfs
+{
+  namespace fallocate
+  {
+    int
+    fallocate(const char            *fusepath,
+              int                    mode,
+              off_t                  offset,
+              off_t                  len,
+              struct fuse_file_info *fi)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config   = config::get();
+      const FileInfo            *fileinfo = (FileInfo*)fi->fh;
+
+      if(fusepath == config.controlfile)
+        return -EINVAL;
+
+      return _fallocate(fileinfo->fd,
+                        mode,
+                        offset,
+                        len);
+    }
+  }
+}

src/fallocate.hpp

@@ -0,0 +1,36 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace fallocate
+  {
+    int
+    fallocate(const char            *fusepath,
+              int                    mode,
+              off_t                  offset,
+              off_t                  len,
+              struct fuse_file_info *fi);
+  }
+}

src/fileinfo.hpp

@@ -0,0 +1,53 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#ifndef __FILEINFO_H__
+#define __FILEINFO_H__
+
+#include <string>
+
+namespace mergerfs
+{
+  struct FileInfo
+  {
+  public:
+    FileInfo(int         fd_,
+             int         flags_,
+             std::string realpath_) :
+      fd(fd_),
+      flags(flags_),
+      realpath(realpath_)
+    {
+    }
+
+    int         fd;
+    int         flags;
+    std::string realpath;
+
+  private:
+    FileInfo() {}
+  };
+}
+
+#endif /* __FILEINFO_H__ */

src/fs.cpp

@@ -0,0 +1,704 @@
+/*
+  The MIT License (MIT)
+
+  Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+  THE SOFTWARE.
+*/
+
+#include <string>
+#include <vector>
+#include <map>
+#include <sstream>
+#include <cstdlib>
+#include <iterator>
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/fs.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/statvfs.h>
+#include <sys/types.h>
+#include <attr/xattr.h>
+#include <unistd.h>
+
+#include "fs.hpp"
+
+using std::string;
+using std::vector;
+using std::map;
+using std::istringstream;
+
+template<typename Container>
+Container&
+split(Container                                  &result,
+      const typename Container::value_type       &s,
+      typename Container::value_type::value_type  delimiter)
+{
+  string        str;
+  istringstream ss(s);
+
+  while(std::getline(ss,str,delimiter))
+    result.push_back(str);
+
+  return result;
+}
+
+template <typename Iter>
+Iter
+random_element(Iter begin,
+               Iter end)
+{
+  const unsigned long n = std::distance(begin, end);
+
+  std::advance(begin, (std::rand() % n));
+
+  return begin;
+}
+
+namespace fs
+{
+  string
+  dirname(const string path)
+  {
+    string parent = path;
+    string::reverse_iterator i;
+    string::reverse_iterator bi;
+
+    bi = parent.rend();
+    i  = parent.rbegin();
+    while(*i == '/' && i != bi)
+      i++;
+
+    while(*i != '/' && i != bi)
+      i++;
+
+    while(*i == '/' && i != bi)
+      i++;
+
+    parent.erase(i.base(),parent.end());
+
+    return parent;
+  }
+
+  string
+  basename(const string path)
+  {
+    return path.substr(path.find_last_of('/')+1);
+  }
+
+  bool
+  dir_is_empty(const string path)
+  {
+    DIR           *dir;
+    struct dirent *de;
+
+    dir = ::opendir(path.c_str());
+    if(!dir)
+      return false;
+
+    while((de = ::readdir(dir)))
+      {
+        const char *d_name = de->d_name;
+
+        if(d_name[0] == '.'     &&
+           ((d_name[1] == '\0') ||
+            (d_name[1] == '.' && d_name[2] == '\0')))
+          continue;
+
+        ::closedir(dir);
+
+        return false;
+      }
+
+    ::closedir(dir);
+
+    return true;
+  }
+
+  string
+  make_path(const string base,
+            const string suffix)
+  {
+    return base + suffix;
+  }
+
+  bool
+  path_exists(vector<string>::const_iterator begin,
+              vector<string>::const_iterator end,
+              const string                   fusepath)
+  {
+    for(vector<string>::const_iterator
+          iter = begin; iter != end; ++iter)
+      {
+        int         rv;
+        struct stat st;
+        string      path;
+
+        path = make_path(*iter,fusepath);
+        rv   = ::lstat(path.c_str(),&st);
+        if(rv == 0)
+          return true;
+      }
+
+    return false;
+  }
+
+  bool
+  path_exists(const vector<string> &srcmounts,
+              const string               fusepath)
+  {
+    return path_exists(srcmounts.begin(),
+                       srcmounts.end(),
+                       fusepath);
+  }
+
+  Path
+  find_first(vector<string>::const_iterator beginiter,
+             vector<string>::const_iterator enditer,
+             const string                   suffix)
+  {
+    for(vector<string>::const_iterator
+          iter = beginiter; iter != enditer; ++iter)
+      {
+        int         rv;
+        struct stat st;
+        string      path;
+
+        path = fs::make_path(*iter,suffix);
+        rv   = ::lstat(path.c_str(),&st);
+        if(rv == 0 || (rv == -1 && errno == EACCES))
+          return Path(*iter,path);
+      }
+
+    return Path();
+  }
+
+  Path
+  find_first(const vector<string> &basepaths,
+             const string          suffix)
+  {
+    return find_first(basepaths.begin(),
+                      basepaths.end(),
+                      suffix);
+  }
+
+  void
+  find_first(const vector<string> &basepaths,
+             const string          suffix,
+             vector<Path>         &paths)
+  {
+    paths.push_back(find_first(basepaths,suffix));
+  }
+
+  Path
+  find_first_with_permission(vector<string>::const_iterator beginiter,
+                             vector<string>::const_iterator enditer,
+                             const string                   suffix)
+  {
+    for(vector<string>::const_iterator
+          iter = beginiter; iter != enditer; ++iter)
+      {
+        int         rv;
+        struct stat st;
+        string      path;
+
+        path = make_path(*iter,suffix);
+        rv   = ::lstat(path.c_str(),&st);
+        if(rv == 0)
+          return Path(*iter,path);
+      }
+
+    return Path();
+  }
+
+  Path
+  find_first_with_permission(const vector<string> &basepaths,
+                             const string          suffix)
+  {
+    return find_first_with_permission(basepaths.begin(),
+                                      basepaths.end(),
+                                      suffix);
+  }
+
+  void
+  find_first_with_permission(const vector<string> &basepaths,
+                             const string          suffix,
+                             vector<Path>         &paths)
+  {
+    paths.push_back(find_first_with_permission(basepaths,suffix));
+  }
+
+  Path
+  find_newest(vector<string>::const_iterator beginiter,
+              vector<string>::const_iterator enditer,
+              const string                   suffix)
+  {
+    time_t newest;
+    string npath;
+    vector<string>::const_iterator niter;
+
+    newest = 0;
+    for(vector<string>::const_iterator
+          iter = beginiter; iter != enditer; ++iter)
+      {
+        int rv;
+        struct stat st;
+        const string path = make_path(*iter,suffix);
+
+        rv  = ::lstat(path.c_str(),&st);
+        if(rv == 0 && st.st_mtime > newest)
+          {
+            newest = st.st_mtime;
+            niter  = iter;
+            npath  = path;
+          }
+      }
+
+    if(newest)
+      return Path(*niter,npath);
+
+    return Path();
+  }
+
+  Path
+  find_newest(const vector<string> &basepaths,
+              const string          suffix)
+  {
+    return find_newest(basepaths.begin(),
+                       basepaths.end(),
+                       suffix);
+  }
+
+  void
+  find_newest(const vector<string> &basepaths,
+              const string          suffix,
+              vector<Path>         &paths)
+  {
+    paths.push_back(find_newest(basepaths,suffix));
+  }
+
+  void
+  find_all(const vector<string> &basepaths,
+           const string          suffix,
+           vector<Path>         &paths)
+  {
+    for(vector<string>::const_iterator
+          i = basepaths.begin(), ei = basepaths.end(); i != ei; ++i)
+      {
+        int         rv;
+        struct stat st;
+        string      path;
+
+        path = fs::make_path(*i,suffix);
+        rv   = ::lstat(path.c_str(),&st);
+        if(rv == 0 || (rv == -1 && errno == EACCES))
+          paths.push_back(Path(*i,path));
+      }
+  }
+
+  Path
+  find_mfs(vector<string>::const_iterator iter,
+           vector<string>::const_iterator enditer,
+           const string                   fusepath)
+  {
+    fsblkcnt_t mfs = 0;
+    string mfspath;
+    string fullmfspath;
+
+    for(;iter != enditer; ++iter)
+      {
+        int rv;
+        struct statvfs fsstats;
+        const string   mountpoint = *iter;
+
+        rv = ::statvfs(mountpoint.c_str(),&fsstats);
+        if(rv == 0)
+          {
+            fsblkcnt_t  spaceavail;
+
+            spaceavail = (fsstats.f_bsize * fsstats.f_bavail);
+            if(spaceavail > mfs)
+              {
+                mfs     = spaceavail;
+                mfspath = mountpoint;
+              }
+          }
+      }
+
+    fullmfspath = make_path(mfspath,fusepath);
+
+    return Path(mfspath,fullmfspath);
+  }
+
+  Path
+  find_mfs(const vector<string> &paths,
+           const string          fusepath)
+  {
+    return find_mfs(paths.begin(),
+                    paths.end(),
+                    fusepath);
+  }
+
+  Path
+  find_mfs_existing(vector<string>::const_iterator iter,
+                    vector<string>::const_iterator enditer,
+                    const string                   fusepath)
+  {
+    fsblkcnt_t existingmfs = 0;
+    fsblkcnt_t generalmfs  = 0;
+    string     path;
+    string     generalmfspath;
+    string     existingmfspath;
+
+    do
+      {
+        int rv;
+        struct statvfs fsstats;
+        const string   mountpoint = *iter;
+
+        rv = ::statvfs(mountpoint.c_str(),&fsstats);
+        if(rv == 0)
+          {
+            struct stat filestats;
+            fsblkcnt_t  spaceavail;
+
+            spaceavail = (fsstats.f_bsize * fsstats.f_bavail);
+            if(spaceavail > generalmfs)
+              {
+                generalmfs     = spaceavail;
+                generalmfspath = mountpoint;
+              }
+
+            path = make_path(mountpoint,fusepath);
+            rv = ::lstat(path.c_str(),&filestats);
+            if(rv == 0)
+              {
+                if(spaceavail > existingmfs)
+                  {
+                    existingmfs     = spaceavail;
+                    existingmfspath = mountpoint;
+                  }
+              }
+          }
+
+        ++iter;
+      }
+    while(iter != enditer);
+
+    if(existingmfspath.empty())
+      existingmfspath = generalmfspath;
+
+    return Path(existingmfspath,path);
+  }
+
+  Path
+  find_mfs_existing(const vector<string> &paths,
+                    const string          fusepath)
+  {
+    return find_mfs_existing(paths.begin(),
+                             paths.end(),
+                             fusepath);
+  }
+
+  Path
+  find_random(vector<string>::const_iterator iter,
+              vector<string>::const_iterator enditer,
+              string                         fusepath)
+  {
+    string randombasepath;
+    string randomfullpath;
+
+    randombasepath = *random_element(iter,enditer);
+    randomfullpath = make_path(randombasepath,fusepath);
+
+    return Path(randombasepath,randomfullpath);
+  }
+
+  Path
+  find_random(const vector<string> &paths,
+              const string          fusepath)
+  {
+    return find_random(paths.begin(),
+                       paths.end(),
+                       fusepath);
+  }
+
+  int
+  listxattr(const string  path,
+            vector<char> &attrs)
+  {
+    int rv;
+    int size;
+
+    rv    = -1;
+    errno = ERANGE;
+    while(rv == -1 && errno == ERANGE)
+      {
+        size = ::listxattr(path.c_str(),NULL,0);
+        attrs.resize(size);
+        rv   = ::listxattr(path.c_str(),&attrs[0],size);
+      }
+
+    return rv;
+  }
+
+  int
+  listxattr(const string         path,
+            vector<string> &attrvector)
+  {
+    int rv;
+    vector<char> attrs;
+
+    rv = listxattr(path,attrs);
+    if(rv != -1)
+      {
+        string tmp(attrs.begin(),attrs.end());
+        split(attrvector,tmp,'\0');
+      }
+
+    return rv;
+  }
+
+  int
+  listxattr(const string  path,
+            string &attrstr)
+  {
+    int rv;
+    vector<char> attrs;
+
+    rv = listxattr(path,attrs);
+    if(rv != -1)
+      attrstr = string(attrs.begin(),attrs.end());
+
+    return rv;
+  }
+
+  int
+  getxattr(const string  path,
+           const string  attr,
+           vector<char> &value)
+  {
+    int rv;
+    int size;
+
+    rv    = -1;
+    errno = ERANGE;
+    while(rv == -1 && errno == ERANGE)
+      {
+        size = ::getxattr(path.c_str(),attr.c_str(),NULL,0);
+        value.resize(size);
+        rv   = ::getxattr(path.c_str(),attr.c_str(),&value[0],size);
+      }
+
+    return rv;
+  }
+
+  int
+  getxattr(const string  path,
+           const string  attr,
+           string       &value)
+  {
+    int          rv;
+    vector<char> tmpvalue;
+
+    rv = getxattr(path,attr,tmpvalue);
+    if(rv != -1)
+      value = string(tmpvalue.begin(),tmpvalue.end());
+
+    return rv;
+  }
+
+
+  int
+  getxattrs(const string        path,
+            map<string,string> &attrs)
+  {
+    int rv;
+    string attrstr;
+
+    rv = listxattr(path,attrstr);
+    if(rv == -1)
+      return -1;
+
+    {
+      string key;
+      istringstream ss(attrstr);
+
+      while(getline(ss,key,'\0'))
+        {
+          string value;
+
+          rv = getxattr(path,key,value);
+          if(rv != -1)
+            attrs[key] = value;
+        }
+    }
+
+    return 0;
+  }
+
+  int
+  setxattr(const string path,
+           const string key,
+           const string value,
+           const int    flags)
+  {
+    return ::setxattr(path.c_str(),
+                      key.c_str(),
+                      value.data(),
+                      value.size(),
+                      flags);
+  }
+
+  int
+  setxattr(const int    fd,
+           const string key,
+           const string value,
+           const int    flags)
+  {
+    return ::fsetxattr(fd,
+                       key.c_str(),
+                       value.data(),
+                       value.size(),
+                       flags);
+  }
+
+  int
+  setxattrs(const string              path,
+            const map<string,string> &attrs)
+  {
+    int fd;
+
+    fd = ::open(path.c_str(),O_RDONLY|O_NONBLOCK);
+    if(fd == -1)
+      return -1;
+
+    for(map<string,string>::const_iterator
+          i = attrs.begin(), ei = attrs.end(); i != ei; ++i)
+      {
+        setxattr(fd,i->first,i->second,0);
+      }
+
+    return ::close(fd);
+  }
+
+  int
+  copyxattrs(const string from,
+             const string to)
+  {
+    int rv;
+    map<string,string> attrs;
+
+    rv = getxattrs(from,attrs);
+    if(rv == -1)
+      return -1;
+
+    return setxattrs(to,attrs);
+  }
+
+  int
+  copyattr(const string from,
+           const string to)
+  {
+    int fd;
+    int rv;
+    int flags;
+    int error;
+    const int openflags = O_RDONLY|O_NONBLOCK;
+
+    fd = ::open(from.c_str(),openflags);
+    if(fd == -1)
+      return -1;
+
+    rv = ::ioctl(fd,FS_IOC_GETFLAGS,&flags);
+    if(rv == -1)
+      {
+        error = errno;
+        ::close(fd);
+        errno = error;
+        return -1;
+      }
+
+    fd = ::open(to.c_str(),openflags);
+    if(fd == -1)
+      return -1;
+
+    rv = ::ioctl(fd,FS_IOC_SETFLAGS,&flags);
+    if(rv == -1)
+      {
+        error = errno;
+        ::close(fd);
+        errno = error;
+        return -1;
+      }
+
+    return ::close(fd);
+  }
+
+  int
+  clonepath(const string fromsrc,
+            const string tosrc,
+            const string relative)
+  {
+    int         rv;
+    struct stat st;
+    string      topath;
+    string      frompath;
+    string      dirname;
+
+    dirname = fs::dirname(relative);
+    if(!dirname.empty())
+      {
+        rv = clonepath(fromsrc,tosrc,dirname);
+        if(rv == -1)
+          return -1;
+      }
+
+    frompath = make_path(fromsrc,relative);
+
+    rv = ::stat(frompath.c_str(),&st);
+    if(rv == -1)
+      return -1;
+    else if(!S_ISDIR(st.st_mode))
+      return (errno = ENOTDIR,-1);
+
+    topath = make_path(tosrc,relative);
+    rv = ::mkdir(topath.c_str(),st.st_mode);
+    if(rv == -1)
+      return -1;
+
+    rv = ::chown(topath.c_str(),st.st_uid,st.st_gid);
+    if(rv == -1)
+      return -1;
+
+    // It may not support it... it's fine...
+    rv = copyattr(frompath,topath);
+    if(rv == -1 && errno != ENOTTY)
+      return -1;
+
+    rv = copyxattrs(frompath,topath);
+    if(rv == -1 && errno != ENOTTY)
+      return -1;
+
+    return (errno = 0);
+  }
+};

src/fs.hpp

@@ -0,0 +1,159 @@
+/*
+  The MIT License (MIT)
+
+  Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+  THE SOFTWARE.
+*/
+
+#ifndef __FS_HPP__
+#define __FS_HPP__
+
+#include <string>
+#include <vector>
+#include <map>
+
+namespace fs
+{
+  using std::string;
+  using std::vector;
+  using std::map;
+
+  struct Path
+  {
+    Path() {}
+    Path(const string b,
+         const string f)
+      : base(b),
+        full(f)
+    {}
+
+    string base;
+    string full;
+  };
+
+  typedef fs::Path (*SearchFunc)(const vector<string>&,const string);
+  typedef void     (*VecSearchFunc)(const vector<string>&,const string,vector<Path>&);
+
+  string dirname(const string path);
+  string basename(const string path);
+
+  bool dir_is_empty(const string path);
+
+  string make_path(const string base,
+                   const string suffix);
+
+  bool path_exists(vector<string>::const_iterator  begin,
+                   vector<string>::const_iterator  end,
+                   const string                    fusepath);
+  bool path_exists(const vector<string>           &srcmounts,
+                   const string                    fusepath);
+
+  Path find_first(vector<string>::const_iterator  begin,
+                  vector<string>::const_iterator  end,
+                  const string                    fusepath);
+  Path find_first(const vector<string>           &paths,
+                  const string                    fusepath);
+  void find_first(const vector<string> &paths,
+                  const string          fusepath,
+                  vector<Path>         &rv);
+
+  Path find_first_with_permission(vector<string>::const_iterator  begin,
+                                  vector<string>::const_iterator  end,
+                                  const string                    fusepath);
+  Path find_first_with_permission(const vector<string>           &paths,
+                                  const string                    fusepath);
+  void find_first_with_permission(const vector<string> &paths,
+                                  const string          fusepath,
+                                  vector<Path>         &rv);
+
+  Path find_newest(vector<string>::const_iterator  begin,
+                   vector<string>::const_iterator  end,
+                   const string                    fusepath);
+  Path find_newest(const vector<string>           &paths,
+                   const string                    fusepath);
+  void find_newest(const vector<string> &paths,
+                   const string          fusepath,
+                   vector<Path>         &rv);
+
+  void find_all(const vector<string> &paths,
+                const string          fusepath,
+                vector<Path>         &rv);
+
+  Path find_mfs(vector<string>::const_iterator  iter,
+                vector<string>::const_iterator  enditer,
+                const string                    fusepath);
+  Path find_mfs(const vector<string>           &paths,
+                const string                    fusepath);
+
+  Path find_mfs_existing(vector<string>::const_iterator  iter,
+                         vector<string>::const_iterator  enditer,
+                         const string                    fusepath);
+  Path find_mfs_existing(const vector<string>           &paths,
+                         const string                    fusepath);
+
+  Path find_random(vector<string>::const_iterator  iter,
+                   vector<string>::const_iterator  enditer,
+                   const string                    fusepath);
+  Path find_random(const vector<string>           &paths,
+                   const string                    fusepath);
+
+
+
+  int clonepath(const string srcfrom,
+                const string srcto,
+                const string relative);
+
+  int listxattr(const string    path,
+                vector<char>   &attrs);
+  int listxattr(const string    path,
+                string         &attrs);
+  int listxattr(const string    path,
+                vector<string> &attrs);
+
+  int getxattr(const string  path,
+               const string  attr,
+               vector<char> &value);
+  int getxattr(const string  path,
+               const string  attr,
+               string       &value);
+
+  int getxattrs(const string        path,
+                map<string,string> &attrs);
+
+  int setxattr(const string path,
+               const string key,
+               const string value,
+               const int    flags);
+  int setxattr(const int    fd,
+               const string key,
+               const string value,
+               const int    flags);
+
+  int setxattrs(const string              path,
+                const map<string,string> &attrs);
+
+  int copyxattrs(const string from,
+                 const string to);
+
+  int copyattr(const string from,
+               const string to);
+};
+
+#endif // __FS_HPP__

src/fsync.cpp

@@ -0,0 +1,75 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <fuse.h>
+
+#include <string>
+#include <vector>
+
+#include <unistd.h>
+#include <errno.h>
+
+#include "config.hpp"
+#include "ugid.hpp"
+#include "fileinfo.hpp"
+
+static
+int
+_fsync(const int fd,
+       const int isdatasync)
+{
+  int rv;
+
+  rv = (isdatasync ?
+        ::fdatasync(fd) :
+        ::fsync(fd));
+
+  return ((rv == -1) ? -errno : 0);
+}
+
+namespace mergerfs
+{
+  namespace fsync
+  {
+    int
+    fsync(const char            *fusepath,
+          int                    isdatasync,
+          struct fuse_file_info *fi)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config   = config::get();
+      const FileInfo            *fileinfo = (FileInfo*)fi->fh;
+
+      if(fusepath == config.controlfile)
+        return 0;
+
+      return _fsync(fileinfo->fd,
+                    isdatasync);
+    }
+  }
+}

src/fsync.hpp

@@ -0,0 +1,36 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+namespace mergerfs
+{
+  namespace fsync
+  {
+    int
+    fsync(const char            *fusepath,
+          int                    isdatasync,
+          struct fuse_file_info *fi);
+  }
+}

src/ftruncate.cpp

@@ -0,0 +1,67 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <errno.h>
+
+#include "config.hpp"
+#include "ugid.hpp"
+#include "fileinfo.hpp"
+
+static
+int
+_ftruncate(const int   fd,
+           const off_t size)
+{
+  int rv;
+
+  rv = ::ftruncate(fd,size);
+
+  return ((rv == -1) ? -errno : 0);
+}
+
+namespace mergerfs
+{
+  namespace ftruncate
+  {
+    int
+    ftruncate(const char            *fusepath,
+              off_t                  size,
+              struct fuse_file_info *fi)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config   = config::get();
+      const FileInfo            *fileinfo = (FileInfo*)fi->fh;
+
+      if(fusepath == config.controlfile)
+        return -EPERM;
+
+      return _ftruncate(fileinfo->fd,
+                        size);
+    }
+  }
+}

src/ftruncate.hpp

@@ -0,0 +1,39 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <unistd.h>
+#include <sys/types.h>
+
+namespace mergerfs
+{
+  namespace ftruncate
+  {
+    int
+    ftruncate(const char            *fusepath,
+              off_t                  size,
+              struct fuse_file_info *fi);
+  }
+}

src/getattr.cpp

@@ -0,0 +1,83 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <string>
+#include <vector>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "config.hpp"
+#include "fs.hpp"
+#include "ugid.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_getattr(const Policy::Search::Func  searchFunc,
+         const vector<string>       &srcmounts,
+         const string                fusepath,
+         struct stat                &buf)
+{
+  int rv;
+  string path;
+
+  path = searchFunc(srcmounts,fusepath).full;
+  if(path.empty())
+    return -ENOENT;
+
+  rv = ::lstat(path.c_str(),&buf);
+
+  return ((rv == -1) ? -errno : 0);
+}
+
+namespace mergerfs
+{
+  namespace getattr
+  {
+    int
+    getattr(const char  *fusepath,
+            struct stat *buf)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return (*buf = config.controlfilestat,0);
+
+      return _getattr(config.policy.search,
+                      config.srcmounts,
+                      fusepath,
+                      *buf);
+    }
+  }
+}

src/getattr.hpp

@@ -0,0 +1,37 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+namespace mergerfs
+{
+  namespace getattr
+  {
+    int
+    getattr(const char  *fusepath,
+            struct stat *buf);
+  }
+}

src/getxattr.cpp

@@ -0,0 +1,90 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <string>
+#include <vector>
+
+#include <errno.h>
+#include <sys/types.h>
+#include <attr/xattr.h>
+
+#include "config.hpp"
+#include "fs.hpp"
+#include "ugid.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_getxattr(const Policy::Search::Func  searchFunc,
+          const vector<string>       &srcmounts,
+          const string                fusepath,
+          const char                 *attrname,
+          char                       *buf,
+          const size_t                count)
+{
+#ifndef WITHOUT_XATTR
+  int rv;
+  string path;
+
+  path = searchFunc(srcmounts,fusepath).full;
+  if(path.empty())
+    return -ENOENT;
+
+  rv = ::lgetxattr(path.c_str(),attrname,buf,count);
+
+  return ((rv == -1) ? -errno : rv);
+#else
+  return -ENOTSUP;
+#endif
+}
+
+namespace mergerfs
+{
+  namespace getxattr
+  {
+    int
+    getxattr(const char *fusepath,
+             const char *attrname,
+             char       *buf,
+             size_t      count)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return -ENOTSUP;
+
+      return _getxattr(config.policy.search,
+                       config.srcmounts,
+                       fusepath,
+                       attrname,
+                       buf,
+                       count);
+    }
+  }
+}

src/getxattr.hpp

@@ -0,0 +1,35 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace getxattr
+  {
+    int
+    getxattr(const char *fusepath,
+             const char *attrname,
+             char       *buf,
+             size_t      count);
+  }
+}

src/ioctl.cpp

@@ -0,0 +1,89 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <string>
+
+#include <errno.h>
+#include <sys/ioctl.h>
+#include <linux/fs.h>
+
+#include "config.hpp"
+#include "fileinfo.hpp"
+#include "ugid.hpp"
+
+static
+int
+_ioctl(const int           fd,
+       const int           cmd,
+       void               *arg,
+       const unsigned int  flags,
+       void               *data)
+{
+  int rv;
+
+  switch(cmd)
+    {
+    case FS_IOC_GETFLAGS:
+    case FS_IOC_SETFLAGS:
+      rv = ::ioctl(fd,cmd,data);
+      break;
+
+    default:
+      rv = -1;
+      errno = ENOTTY;
+      break;
+    }
+
+  return ((rv == -1) ? -errno : rv);
+}
+
+namespace mergerfs
+{
+  namespace ioctl
+  {
+    int
+    ioctl(const char            *fusepath,
+          int                    cmd,
+          void                  *arg,
+          struct fuse_file_info *fi,
+          unsigned int           flags,
+          void                  *data)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config   = config::get();
+      const FileInfo            *fileinfo = (FileInfo*)fi->fh;
+
+      if(fusepath == config.controlfile)
+        return -EINVAL;
+
+      return _ioctl(fileinfo->fd,
+                    cmd,
+                    arg,
+                    flags,
+                    data);
+    }
+  }
+}

src/ioctl.hpp

@@ -0,0 +1,37 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace ioctl
+  {
+    int
+    ioctl(const char            *fusepath,
+          int                    cmd,
+          void                  *arg,
+          struct fuse_file_info *fi,
+          unsigned int           flags,
+          void                  *data);
+  }
+}

src/link.cpp

@@ -0,0 +1,91 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <string>
+#include <vector>
+
+#include <errno.h>
+#include <unistd.h>
+
+#include "config.hpp"
+#include "fs.hpp"
+#include "ugid.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_link(const Policy::Action::Func  searchFunc,
+      const vector<string>       &srcmounts,
+      const string                from,
+      const string                to)
+{
+  int rv;
+  int error;
+  vector<fs::Path> paths;
+
+  searchFunc(srcmounts,from,paths);
+  if(paths.empty())
+    return -ENOENT;
+
+  rv    = -1;
+  error =  0;
+  for(vector<fs::Path>::const_iterator
+        i = paths.begin(), ei = paths.end(); i != ei; ++i)
+    {
+      const string pathfrom = fs::make_path(i->base,from);
+      const string pathto   = fs::make_path(i->base,to);
+
+      rv &= ::link(pathfrom.c_str(),pathto.c_str());
+      if(rv == -1)
+        error = errno;
+    }
+
+  return ((rv == -1) ? -error : 0);
+}
+
+namespace mergerfs
+{
+  namespace link
+  {
+    int
+    link(const char *from,
+         const char *to)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(from == config.controlfile)
+        return -EPERM;
+
+      return _link(config.policy.action,
+                   config.srcmounts,
+                   from,
+                   to);
+    }
+  }
+}

src/link.hpp

@@ -0,0 +1,33 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace link
+  {
+    int
+    link(const char *from,
+         const char *to);
+  }
+}

src/listxattr.cpp

@@ -0,0 +1,87 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <string>
+#include <vector>
+
+#include <sys/types.h>
+#include <attr/xattr.h>
+#include <errno.h>
+
+#include "config.hpp"
+#include "fs.hpp"
+#include "ugid.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_listxattr(const Policy::Search::Func  searchFunc,
+           const vector<string>       &srcmounts,
+           const string                fusepath,
+           char                       *list,
+           const size_t                size)
+{
+#ifndef WITHOUT_XATTR
+  int rv;
+  string path;
+
+  path = searchFunc(srcmounts,fusepath).full;
+  if(path.empty())
+    return -ENOENT;
+
+  rv = ::llistxattr(path.c_str(),list,size);
+
+  return ((rv == -1) ? -errno : rv);
+#else
+  return -ENOTSUP;
+#endif
+}
+
+namespace mergerfs
+{
+  namespace listxattr
+  {
+    int
+    listxattr(const char *fusepath,
+              char       *list,
+              size_t      size)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return -ENOTSUP;
+
+      return _listxattr(config.policy.search,
+                        config.srcmounts,
+                        fusepath,
+                        list,
+                        size);
+    }
+  }
+}

src/listxattr.hpp

@@ -0,0 +1,34 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace listxattr
+  {
+    int
+    listxattr(const char *fusepath,
+              char       *buf,
+              size_t      count);
+  }
+}

src/mergerfs.cpp

@@ -0,0 +1,163 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+ */
+
+#include <fuse.h>
+#include <string.h>
+
+#include <cstdlib>
+#include <iostream>
+
+#include "mergerfs.hpp"
+#include "option_parser.hpp"
+#include "resources.hpp"
+#include "fs.hpp"
+#include "test.hpp"
+
+#include "access.hpp"
+#include "chmod.hpp"
+#include "chown.hpp"
+#include "create.hpp"
+#include "fallocate.hpp"
+#include "fsync.hpp"
+#include "ftruncate.hpp"
+#include "getattr.hpp"
+#include "getxattr.hpp"
+#include "ioctl.hpp"
+#include "link.hpp"
+#include "listxattr.hpp"
+#include "mkdir.hpp"
+#include "mknod.hpp"
+#include "open.hpp"
+#include "read.hpp"
+#include "readdir.hpp"
+#include "readlink.hpp"
+#include "release.hpp"
+#include "removexattr.hpp"
+#include "rename.hpp"
+#include "rmdir.hpp"
+#include "setxattr.hpp"
+#include "statfs.hpp"
+#include "symlink.hpp"
+#include "truncate.hpp"
+#include "unlink.hpp"
+#include "utimens.hpp"
+#include "write.hpp"
+
+static
+struct fuse_operations
+get_fuse_operations()
+{
+  struct fuse_operations ops = {};
+
+  ops.flag_nopath      = false;
+  ops.flag_nullpath_ok = false;
+
+  ops.access      = mergerfs::access::access;
+  ops.bmap        = NULL;
+  ops.chmod       = mergerfs::chmod::chmod;
+  ops.chown       = mergerfs::chown::chown;
+  ops.create      = mergerfs::create::create;
+  ops.destroy     = NULL;
+  ops.fallocate   = mergerfs::fallocate::fallocate;
+  ops.fgetattr    = NULL;
+  ops.flock       = NULL;
+  ops.flush       = NULL;       /* called on close() of fd */
+  ops.fsync       = mergerfs::fsync::fsync;
+  ops.fsyncdir    = NULL;
+  ops.ftruncate   = mergerfs::ftruncate::ftruncate;
+  ops.getattr     = mergerfs::getattr::getattr;
+  ops.getdir      = NULL;       /* deprecated; use readdir */
+  ops.getxattr    = mergerfs::getxattr::getxattr;
+  ops.init        = NULL;
+  ops.ioctl       = NULL;
+  ops.ioctl       = mergerfs::ioctl::ioctl;
+  ops.link        = mergerfs::link::link;
+  ops.listxattr   = mergerfs::listxattr::listxattr;
+  ops.lock        = NULL;
+  ops.mkdir       = mergerfs::mkdir::mkdir;
+  ops.mknod       = mergerfs::mknod::mknod;
+  ops.open        = mergerfs::open::open;
+  ops.opendir     = NULL;
+  ops.poll        = NULL;
+  ops.read        = mergerfs::read::read;
+  ops.read_buf    = NULL;
+  ops.readdir     = mergerfs::readdir::readdir;
+  ops.readlink    = mergerfs::readlink::readlink;
+  ops.release     = mergerfs::release::release;
+  ops.releasedir  = NULL;
+  ops.removexattr = mergerfs::removexattr::removexattr;
+  ops.rename      = mergerfs::rename::rename;
+  ops.rmdir       = mergerfs::rmdir::rmdir;
+  ops.setxattr    = mergerfs::setxattr::setxattr;
+  ops.statfs      = mergerfs::statfs::statfs;
+  ops.symlink     = mergerfs::symlink::symlink;
+  ops.truncate    = mergerfs::truncate::truncate;
+  ops.unlink      = mergerfs::unlink::unlink;
+  ops.utime       = NULL;       /* deprecated; use utimens() */
+  ops.utimens     = mergerfs::utimens::utimens;
+  ops.write       = mergerfs::write::write;
+  ops.write_buf   = NULL;
+
+  return ops;
+}
+
+namespace mergerfs
+{
+  int
+  main(const struct fuse_args &args,
+       config::Config         &config)
+  {
+    struct fuse_operations ops;
+
+    ops = get_fuse_operations();
+
+    std::srand(time(NULL));
+    resources::reset_umask();
+    resources::maxout_rlimit_nofile();
+    resources::maxout_rlimit_fsize();
+
+    return fuse_main(args.argc,
+                     args.argv,
+                     &ops,
+                     &config);
+  }
+}
+
+int
+main(int   argc,
+     char *argv[])
+{
+  int rv;
+  mergerfs::config::Config config;
+  struct fuse_args args = FUSE_ARGS_INIT(argc,argv);
+
+  mergerfs::options::parse(args,config);
+
+  if(config.testmode == false)
+    rv = mergerfs::main(args,config);
+  else
+    rv = mergerfs::test(args,config);
+
+  return rv;
+}

src/mergerfs.hpp

@@ -0,0 +1,28 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#ifndef __MERGER_HPP__
+#define __MERGER_HPP__
+
+#endif

src/mkdir.cpp

@@ -0,0 +1,98 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <string>
+#include <vector>
+
+#include "ugid.hpp"
+#include "fileinfo.hpp"
+#include "fs.hpp"
+#include "config.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_mkdir(const Policy::Search::Func  searchFunc,
+       const Policy::Create::Func  createPathFunc,
+       const vector<string>       &srcmounts,
+       const string                fusepath,
+       const mode_t                mode)
+{
+  int rv;
+  string path;
+  string dirname;
+  fs::Path createpath;
+  fs::Path existingpath;
+
+  if(fs::path_exists(srcmounts,fusepath))
+    return -EEXIST;
+
+  dirname      = fs::dirname(fusepath);
+  existingpath = searchFunc(srcmounts,dirname);
+  if(existingpath.base.empty())
+    return -ENOENT;
+
+  createpath = createPathFunc(srcmounts,dirname);
+  if(createpath.base != existingpath.base)
+    fs::clonepath(existingpath.base,createpath.base,dirname);
+
+  path = fs::make_path(createpath.base,fusepath);
+
+  rv = ::mkdir(path.c_str(),mode);
+
+  return ((rv == -1) ? -errno : 0);
+}
+
+namespace mergerfs
+{
+  namespace mkdir
+  {
+    int
+    mkdir(const char *fusepath,
+          mode_t      mode)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return -EEXIST;
+
+      return _mkdir(config.policy.search,
+                    config.policy.create,
+                    config.srcmounts,
+                    fusepath,
+                    mode);
+    }
+  }
+}

src/mkdir.hpp

@@ -0,0 +1,33 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace mkdir
+  {
+    int
+    mkdir(const char *fusepath,
+          mode_t      mode);
+  }
+}

src/mknod.cpp

@@ -0,0 +1,102 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <string>
+#include <vector>
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "ugid.hpp"
+#include "fs.hpp"
+#include "config.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_mknod(const Policy::Search::Func  searchFunc,
+       const Policy::Create::Func  createPathFunc,
+       const vector<string>       &srcmounts,
+       const string                fusepath,
+       const mode_t                mode,
+       const dev_t                 dev)
+{
+  int rv;
+  string path;
+  string dirname;
+  fs::Path createpath;
+  fs::Path existingpath;
+
+  if(fs::path_exists(srcmounts,fusepath))
+    return -EEXIST;
+
+  dirname      = fs::dirname(fusepath);
+  existingpath = searchFunc(srcmounts,dirname);
+  if(existingpath.base.empty())
+    return -ENOENT;
+
+  createpath = createPathFunc(srcmounts,dirname);
+  if(existingpath.base != createpath.base)
+    fs::clonepath(existingpath.base,createpath.base,dirname);
+
+  path = fs::make_path(createpath.base,fusepath);
+
+  rv = ::mknod(path.c_str(),mode,dev);
+
+  return ((rv == -1) ? -errno : 0);
+}
+
+namespace mergerfs
+{
+  namespace mknod
+  {
+    int
+    mknod(const char *fusepath,
+          mode_t      mode,
+          dev_t       rdev)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return -EEXIST;
+
+      return _mknod(config.policy.search,
+                    config.policy.create,
+                    config.srcmounts,
+                    fusepath,
+                    mode,
+                    rdev);
+    }
+  }
+}

src/mknod.hpp

@@ -0,0 +1,34 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace mknod
+  {
+    int
+    mknod(const char *fusepath,
+          mode_t      mode,
+          dev_t       rdev);
+  }
+}

src/open.cpp

@@ -0,0 +1,99 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string>
+#include <vector>
+
+#include "ugid.hpp"
+#include "fileinfo.hpp"
+#include "fs.hpp"
+#include "config.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::FileInfo;
+using mergerfs::Policy;
+
+static
+int
+_open_controlfile(uint64_t &fh)
+{
+  fh = (uint64_t)new string;
+
+  return 0;
+}
+
+static
+int
+_open(const Policy::Search::Func  searchFunc,
+      const vector<string>       &srcmounts,
+      const string                fusepath,
+      const int                   flags,
+      uint64_t                   &fh)
+{
+  int      fd;
+  fs::Path path;
+
+  path = searchFunc(srcmounts,fusepath);
+  if(path.full.empty())
+    return -ENOENT;
+
+  fd = ::open(path.full.c_str(),flags);
+  if(fd == -1)
+    return -errno;
+
+  fh = (uint64_t)new FileInfo(fd,flags,path.full);
+
+  return 0;
+}
+
+namespace mergerfs
+{
+  namespace open
+  {
+    int
+    open(const char            *fusepath,
+         struct fuse_file_info *fileinfo)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return _open_controlfile(fileinfo->fh);
+
+      return _open(config.policy.search,
+                   config.srcmounts,
+                   fusepath,
+                   fileinfo->flags,
+                   fileinfo->fh);
+    }
+  }
+}

src/open.hpp

@@ -0,0 +1,35 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+namespace mergerfs
+{
+  namespace open
+  {
+    int
+    open(const char            *fusepath,
+         struct fuse_file_info *fileinfo);
+  }
+}

src/option_parser.cpp

@@ -0,0 +1,145 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <stddef.h>
+#include <string.h>
+
+#include <iostream>
+#include <string>
+#include <sstream>
+
+#include "config.hpp"
+#include "policy.hpp"
+
+using namespace mergerfs;
+
+template<typename Container>
+Container&
+split(Container                                  &result,
+      const typename Container::value_type       &s,
+      typename Container::value_type::value_type  delimiter)
+{
+  std::istringstream ss(s);
+  while(!ss.eof())
+    {
+      typename Container::value_type field;
+      std::getline(ss,field,delimiter);
+      if(field.empty())
+        continue;
+      result.push_back(field);
+    }
+
+  return result;
+}
+
+static
+int
+process_opt(config::Config    &config,
+            const std::string  arg)
+{
+  int rv = 0;
+  std::vector<std::string> argvalue;
+  Policy &policy = config.policy;
+
+  split(argvalue,arg,'=');
+  switch(argvalue.size())
+    {
+    case 2:
+      if(argvalue[0] == "statfs")
+        policy.statfs.fromString(argvalue[1]);
+      else if(argvalue[0] == "create")
+        policy.create.fromString(argvalue[1]);
+      else if(argvalue[0] == "search")
+        policy.search.fromString(argvalue[1]);
+      else if(argvalue[0] == "action")
+        policy.action.fromString(argvalue[1]);
+      else
+        rv = 1;
+      break;
+
+    default:
+    case 1:
+      if(argvalue[0] == "test")
+        config.testmode = true;
+      else
+        rv = 1;
+      break;
+    };
+
+  return rv;
+}
+
+static
+int
+option_processor(void             *data,
+                 const char       *arg,
+                 int               key,
+                 struct fuse_args *outargs)
+{
+  int rv = 0;
+  config::Config &config = *(config::Config*)data;
+
+  switch(key)
+    {
+    case FUSE_OPT_KEY_OPT:
+      rv = process_opt(config,arg);
+      break;
+
+    case FUSE_OPT_KEY_NONOPT:
+      if(config.destmount.empty())
+        {
+          rv = 1;
+          config.destmount = arg;
+        }
+      else
+        {
+          split(config.srcmounts,arg,':');
+        }
+      break;
+
+    default:
+      break;
+    }
+
+  return rv;
+}
+
+namespace mergerfs
+{
+  namespace options
+  {
+    void
+    parse(struct fuse_args &args,
+          config::Config   &config)
+    {
+      fuse_opt_parse(&args,
+                     &config,
+                     NULL,
+                     ::option_processor);
+      config.updateReadStr();
+    }
+  }
+}

src/option_parser.hpp

@@ -0,0 +1,37 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include "config.hpp"
+
+namespace mergerfs
+{
+  namespace options
+  {
+    void
+    parse(struct fuse_args         &args,
+          mergerfs::config::Config &config);
+  }
+}

src/policy.cpp

@@ -0,0 +1,306 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include "policy.hpp"
+#include "fs.hpp"
+
+namespace mergerfs
+{
+  Policy::Create::Create(Type value)
+  {
+    *this = value;
+  }
+
+  Policy::Create&
+  Policy::Create::operator=(const Policy::Create::Type value)
+  {
+    _str   = toString(value);
+    _value = fromString(_str);
+    _func  = findFunc(_value);
+
+    return *this;
+  }
+
+  Policy::Create&
+  Policy::Create::operator=(const std::string str)
+  {
+    _value = fromString(str);
+    _str   = toString(_value);
+    _func  = findFunc(_value);
+
+    return *this;
+  }
+
+  Policy::Create::Type
+  Policy::Create::fromString(const std::string str)
+  {
+    if(str == "ep")
+      return Policy::Create::ExistingPath;
+    else if(str == "mfs")
+      return Policy::Create::MostFreeSpace;
+    else if(str == "epmfs")
+      return Policy::Create::ExistingPathMostFreeSpace;
+    else if(str == "rand")
+      return Policy::Create::Random;
+
+    return Policy::Create::Invalid;
+  }
+
+  std::string
+  Policy::Create::toString(const Type value)
+  {
+    switch(value)
+      {
+      case Policy::Create::ExistingPath:
+        return "ep";
+      case Policy::Create::ExistingPathMostFreeSpace:
+        return "epmfs";
+      case Policy::Create::MostFreeSpace:
+        return "mfs";
+      case Policy::Create::Random:
+        return "rand";
+      case Policy::Create::Invalid:
+      default:
+        return "invalid";
+      }
+  }
+
+  Policy::Create::Func
+  Policy::Create::findFunc(Policy::Create::Type value)
+  {
+    switch(value)
+      {
+      case Policy::Create::ExistingPath:
+        return fs::find_first;
+      case Policy::Create::ExistingPathMostFreeSpace:
+        return fs::find_mfs_existing;
+      case Policy::Create::MostFreeSpace:
+        return fs::find_mfs;
+      case Policy::Create::Random:
+        return fs::find_random;
+      case Policy::Create::Invalid:
+      default:
+        return NULL;
+      }
+  }
+
+  Policy::Search::Search(Type value)
+  {
+    *this = value;
+  }
+
+  Policy::Search&
+  Policy::Search::operator=(const Policy::Search::Type value)
+  {
+    _str   = toString(value);
+    _value = fromString(_str);
+    _func  = findFunc(_value);
+
+    return *this;
+  }
+
+  Policy::Search&
+  Policy::Search::operator=(const std::string str)
+  {
+    _value = fromString(str);
+    _str   = toString(_value);
+    _func  = findFunc(_value);
+
+    return *this;
+  }
+
+  Policy::Search::Type
+  Policy::Search::fromString(const std::string str)
+  {
+    if(str == "ff")
+      return Policy::Search::FirstFound;
+    else if(str == "ffwp")
+      return Policy::Search::FirstFoundWithPermissions;
+    else if(str == "newest")
+      return Policy::Search::Newest;
+
+    return Policy::Search::Invalid;
+  }
+
+  std::string
+  Policy::Search::toString(Policy::Search::Type value)
+  {
+    switch(value)
+      {
+      case Policy::Search::FirstFound:
+        return "ff";
+      case Policy::Search::FirstFoundWithPermissions:
+        return "ffwp";
+      case Policy::Search::Newest:
+        return "newest";
+      case Policy::Search::Invalid:
+      default:
+        return "invalid";
+      }
+  }
+
+  Policy::Search::Func
+  Policy::Search::findFunc(Policy::Search::Type value)
+  {
+    switch(value)
+      {
+      case Policy::Search::FirstFound:
+        return fs::find_first;
+      case Policy::Search::FirstFoundWithPermissions:
+        return fs::find_first_with_permission;
+      case Policy::Search::Newest:
+        return fs::find_newest;
+      case Policy::Search::Invalid:
+      default:
+        return NULL;
+      }
+  }
+
+  Policy::Action::Action(const Policy::Action::Type value)
+  {
+    *this = value;
+  }
+
+  Policy::Action&
+  Policy::Action::operator=(const Policy::Action::Type value)
+  {
+    _str   = toString(value);
+    _value = fromString(_str);
+    _func  = findFunc(_value);
+
+    return *this;
+  }
+
+  Policy::Action&
+  Policy::Action::operator=(const std::string str)
+  {
+    _value = fromString(str);
+    _str   = toString(_value);
+    _func  = findFunc(_value);
+
+    return *this;
+  }
+
+  Policy::Action::Type
+  Policy::Action::fromString(const std::string str)
+  {
+    if(str == "ff")
+      return Policy::Action::FirstFound;
+    else if(str == "ffwp")
+      return Policy::Action::FirstFoundWithPermissions;
+    else if(str == "newest")
+      return Policy::Action::Newest;
+    else if(str == "all")
+      return Policy::Action::All;
+
+    return Policy::Action::Invalid;
+  }
+
+  std::string
+  Policy::Action::toString(Policy::Action::Type value)
+  {
+    switch(value)
+      {
+      case Policy::Action::FirstFound:
+        return "ff";
+      case Policy::Action::FirstFoundWithPermissions:
+        return "ffwp";
+      case Policy::Action::Newest:
+        return "newest";
+      case Policy::Action::All:
+        return "all";
+      case Policy::Action::Invalid:
+      default:
+        return "invalid";
+      }
+  }
+
+  Policy::Action::Func
+  Policy::Action::findFunc(const Policy::Action::Type value)
+  {
+    switch(value)
+      {
+      case Policy::Action::FirstFound:
+        return fs::find_first;
+      case Policy::Action::FirstFoundWithPermissions:
+        return fs::find_first_with_permission;
+      case Policy::Action::Newest:
+        return fs::find_newest;
+      case Policy::Action::All:
+        return fs::find_all;
+      case Policy::Action::Invalid:
+      default:
+        return NULL;
+      }
+  }
+
+  Policy::StatFS::StatFS(const Policy::StatFS::Type value)
+  {
+    *this = value;
+  }
+
+  Policy::StatFS&
+  Policy::StatFS::operator=(Policy::StatFS::Type value)
+  {
+    _str   = toString(value);
+    _value = fromString(_str);
+
+    return *this;
+  }
+
+  Policy::StatFS&
+  Policy::StatFS::operator=(const std::string str)
+  {
+    _value = fromString(str);
+    _str   = toString(_value);
+
+    return *this;
+  }
+
+  Policy::StatFS::Type
+  Policy::StatFS::fromString(const std::string str)
+  {
+    if(str == "susf")
+      return Policy::StatFS::SumUsedSumFree;
+    else if(str == "sumf")
+      return Policy::StatFS::SumUsedMaxFree;
+
+    return Policy::StatFS::Invalid;
+  }
+
+  std::string
+  Policy::StatFS::toString(const Policy::StatFS::Type value)
+  {
+    switch(value)
+      {
+      case Policy::StatFS::SumUsedSumFree:
+        return "susf";
+      case Policy::StatFS::SumUsedMaxFree:
+        return "sumf";
+      case Policy::StatFS::Invalid:
+      default:
+        return "invalid";
+      }
+  }
+}

src/policy.hpp

@@ -0,0 +1,207 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#ifndef __POLICY_HPP__
+#define __POLICY_HPP__
+
+#include <string>
+
+#include "fs.hpp"
+
+namespace mergerfs
+{
+  class Policy
+  {
+  public:
+    enum Type
+      {
+        STATFS,
+        ACTION,
+        CREATE,
+        SEARCH
+      };
+
+  public:
+    class StatFS
+    {
+    public:
+      enum Type
+        {
+          Invalid = -1,
+          SumUsedSumFree,
+          SumUsedMaxFree,
+          Max
+        };
+
+      StatFS(Type _value);
+
+    public:
+      operator Type() const { return _value; }
+      operator std::string() const { return _str; }
+      std::string str() const { return _str; }
+
+      StatFS& operator=(const Type);
+      StatFS& operator=(const std::string);
+
+      static Type        fromString(const std::string);
+      static std::string toString(const Type);
+
+    private:
+      StatFS();
+
+    private:
+      Type        _value;
+      std::string _str;
+    };
+
+    class Create
+    {
+    public:
+      typedef fs::SearchFunc Func;
+      enum Type
+        {
+          Invalid = -1,
+          ExistingPath,
+          MostFreeSpace,
+          ExistingPathMostFreeSpace,
+          Random,
+          Max
+        };
+
+    public:
+      Create(Type);
+
+      operator Type() const { return _value; }
+      operator Func() const { return _func;  }
+      operator std::string() const { return _str; }
+      std::string str() const { return _str; }
+
+      Create& operator=(const Type);
+      Create& operator=(const std::string);
+
+      static Type        fromString(const std::string);
+      static std::string toString(const Type);
+      static Func        findFunc(const Type);
+
+    private:
+      Create();
+
+    private:
+      Type        _value;
+      std::string _str;
+      Func        _func;
+    };
+
+    class Search
+    {
+    public:
+      typedef fs::SearchFunc Func;
+      enum Type
+        {
+          Invalid = -1,
+          FirstFound,
+          FirstFoundWithPermissions,
+          Newest,
+          Max
+        };
+
+    public:
+      Search(Type);
+
+      operator Type() const { return _value; }
+      operator Func() const { return _func;  }
+      operator std::string() const { return _str; }
+      std::string str() const { return _str; }
+
+      Search& operator=(const Type);
+      Search& operator=(const std::string);
+
+      static Type        fromString(const std::string);
+      static std::string toString(const Type);
+      static Func        findFunc(const Type);
+
+    private:
+      Search();
+
+    private:
+      Type        _value;
+      std::string _str;
+      Func        _func;
+    };
+
+    class Action
+    {
+    public:
+      typedef fs::VecSearchFunc Func;
+      enum Type
+        {
+          Invalid = -1,
+          FirstFound,
+          FirstFoundWithPermissions,
+          Newest,
+          All,
+          Max
+        };
+
+    public:
+      Action(Type);
+
+      operator Type() const { return _value; }
+      operator Func() const { return _func;  }
+      operator std::string() const { return _str; }
+      std::string str() const { return _str; }
+
+      Action& operator=(const Type);
+      Action& operator=(const std::string);
+
+      static Type        fromString(const std::string);
+      static std::string toString(const Type);
+      static Func        findFunc(const Type);
+
+    private:
+      Action();
+
+    private:
+      Type        _value;
+      std::string _str;
+      Func        _func;
+    };
+
+  public:
+    Policy() :
+      statfs(StatFS::SumUsedMaxFree),
+      create(Create::ExistingPathMostFreeSpace),
+      search(Search::FirstFound),
+      action(Action::FirstFound)
+    {}
+
+  public:
+    StatFS statfs;
+    Create create;
+    Search search;
+    Action action;
+  };
+}
+
+#endif

src/read.cpp

@@ -0,0 +1,94 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <string>
+#include <algorithm>
+
+#include "config.hpp"
+#include "ugid.hpp"
+#include "fileinfo.hpp"
+
+using std::string;
+
+static
+int
+_read_controlfile(const string  readstr,
+                  char         *buf,
+                  const size_t  count)
+{
+  size_t n;
+
+  n = std::min(count,readstr.length());
+
+  memcpy(buf,readstr.data(),n);
+
+  return (int)n;
+}
+
+static
+int
+_read(const int     fd,
+      void         *buf,
+      const size_t  count,
+      const off_t   offset)
+{
+  int rv;
+
+  rv = ::pread(fd,buf,count,offset);
+
+  return ((rv == -1) ? -errno : rv);
+}
+
+namespace mergerfs
+{
+  namespace read
+  {
+    int
+    read(const char            *fusepath,
+         char                  *buf,
+         size_t                 count,
+         off_t                  offset,
+         struct fuse_file_info *fi)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return _read_controlfile(config.readstr,
+                                 buf,
+                                 count);
+
+      return _read(((FileInfo*)fi->fh)->fd,
+                   buf,
+                   count,
+                   offset);
+    }
+  }
+}

src/read.hpp

@@ -0,0 +1,36 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace read
+  {
+    int
+    read(const char            *fusepath,
+         char                  *buf,
+         size_t                 count,
+         off_t                  offset,
+         struct fuse_file_info *fi);
+  }
+}

src/readdir.cpp

@@ -0,0 +1,147 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <string>
+#include <set>
+#include <vector>
+
+#include <errno.h>
+#include <dirent.h>
+
+#include "readdir.hpp"
+#include "config.hpp"
+#include "ugid.hpp"
+#include "fs.hpp"
+
+using std::string;
+using std::vector;
+using std::set;
+using std::pair;
+using mergerfs::readdir::FileData;
+
+#define NO_OFFSET 0
+
+static
+int
+_readdir(const vector<string>  &srcmounts,
+         const string           dirname,
+         void                  *buf,
+         const fuse_fill_dir_t  filler)
+{
+  set<string> found;
+
+  for(vector<string>::const_iterator
+        iter = srcmounts.begin(), enditer = srcmounts.end();
+      iter != enditer;
+      ++iter)
+    {
+      DIR *dh;
+      string basepath;
+
+      basepath = fs::make_path(*iter,dirname);
+      dh = ::opendir(basepath.c_str());
+      if(!dh)
+        continue;
+
+      for(struct dirent *de = ::readdir(dh); de != NULL; de = ::readdir(dh))
+        {
+          string d_name(de->d_name);
+          pair<set<string>::iterator,bool> ret;
+
+          ret = found.insert(d_name);
+          if(ret.second == false)
+            continue;
+
+          {
+            struct stat st;
+            string path;
+
+            path = fs::make_path(basepath,d_name);
+            if(::lstat(path.c_str(),&st) == -1)
+              {
+                found.erase(ret.first);
+                continue;
+              }
+
+            filler(buf,de->d_name,&st,NO_OFFSET);
+          }
+        }
+
+      ::closedir(dh);
+    }
+
+  if(found.empty())
+    return -ENOENT;
+
+  return 0;
+}
+
+static
+int
+stat_vector_filler(void              *buf,
+                   const char        *name,
+                   const struct stat *stbuf,
+                   off_t              off)
+{
+  vector<FileData> *stats = (vector<FileData>*)buf;
+
+  stats->push_back(FileData(name,*stbuf));
+
+  return 0;
+}
+
+namespace mergerfs
+{
+  namespace readdir
+  {
+    int
+    readdir(const vector<string> &srcmounts,
+            const string          dirname,
+            vector<FileData>     &stats)
+    {
+      return _readdir(srcmounts,
+                      dirname,
+                      &stats,
+                      stat_vector_filler);
+    }
+
+    int
+    readdir(const char            *fusepath,
+            void                  *buf,
+            fuse_fill_dir_t        filler,
+            off_t                  offset,
+            struct fuse_file_info *fi)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      return _readdir(config.srcmounts,
+                      fusepath,
+                      buf,
+                      filler);
+    }
+  }
+}

src/readdir.hpp

@@ -0,0 +1,67 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#ifndef __MERGERFS_READDIR_HPP__
+#define __MERGERFS_READDIR_HPP__
+
+#include <fuse.h>
+
+#include <string>
+#include <vector>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+namespace mergerfs
+{
+  namespace readdir
+  {
+    struct FileData
+    {
+      FileData(std::string filename_,
+               struct stat stats_)
+        : filename(filename_),
+          stats(stats_)
+      {}
+
+      std::string filename;
+      struct stat stats;
+    };
+
+    int
+    readdir(const char            *fusepath,
+            void                  *buf,
+            fuse_fill_dir_t        filler,
+            off_t                  offset,
+            struct fuse_file_info *fi);
+
+    int
+    readdir(const std::vector<std::string> &srcmounts,
+            const std::string               dirname,
+            std::vector<FileData>          &stats);
+  }
+}
+
+#endif

src/readlink.cpp

@@ -0,0 +1,88 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <errno.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <string.h>
+#include <string>
+
+#include "config.hpp"
+#include "ugid.hpp"
+#include "fs.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_readlink(const Policy::Search::Func  searchFunc,
+          const vector<string>&       srcmounts,
+          const string                fusepath,
+          char                       *buf,
+          const size_t                size)
+{
+  int rv;
+  string path;
+
+  path = searchFunc(srcmounts,fusepath).full;
+  if(path.empty())
+    return -ENOENT;
+
+  rv = ::readlink(path.c_str(),buf,size);
+  if(rv == -1)
+    return -errno;
+
+  buf[rv] = '\0';
+
+  return 0;
+}
+
+namespace mergerfs
+{
+  namespace readlink
+  {
+    int
+    readlink(const char *fusepath,
+             char       *buf,
+             size_t      size)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return -EINVAL;
+
+      return _readlink(config.policy.search,
+                       config.srcmounts,
+                       fusepath,
+                       buf,
+                       size);
+    }
+  }
+}

src/readlink.hpp

@@ -0,0 +1,34 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace readlink
+  {
+    int
+    readlink(const char *fusepath,
+             char       *buf,
+             size_t      size);
+  }
+}

src/release.cpp

@@ -0,0 +1,83 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <errno.h>
+
+#include <string>
+
+#include "config.hpp"
+#include "ugid.hpp"
+#include "fileinfo.hpp"
+
+using std::string;
+using mergerfs::FileInfo;
+
+static
+int
+_release_controlfile(uint64_t &fh)
+{
+  string *strbuf = (string*)fh;
+
+  delete strbuf;
+
+  fh = 0;
+
+  return 0;
+}
+
+static
+int
+_release(uint64_t &fh)
+{
+  const FileInfo *fileinfo = (FileInfo*)fh;
+
+  ::close(fileinfo->fd);
+
+  delete fileinfo;
+
+  fh = 0;
+
+  return 0;
+}
+
+namespace mergerfs
+{
+  namespace release
+  {
+    int
+    release(const char            *fusepath,
+            struct fuse_file_info *fi)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return _release_controlfile(fi->fh);
+
+      return _release(fi->fh);
+    }
+  }
+}

src/release.hpp

@@ -0,0 +1,33 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace release
+  {
+    int
+    release(const char            *fusepath,
+            struct fuse_file_info *fi);
+  }
+}

src/removexattr.cpp

@@ -0,0 +1,93 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <string>
+#include <vector>
+
+#include <errno.h>
+#include <sys/types.h>
+#include <attr/xattr.h>
+
+#include "config.hpp"
+#include "ugid.hpp"
+#include "fs.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_removexattr(const Policy::Action::Func  searchFunc,
+             const vector<string>       &srcmounts,
+             const string                fusepath,
+             const char                 *attrname)
+{
+#ifndef WITHOUT_XATTR
+  int rv;
+  int error;
+  vector<fs::Path> paths;
+
+  searchFunc(srcmounts,fusepath,paths);
+  if(paths.empty())
+    return -ENOENT;
+
+  rv    = -1;
+  error =  0;
+  for(vector<fs::Path>::const_iterator
+        i = paths.begin(), ei = paths.end(); i != ei; ++i)
+    {
+      rv &= ::lremovexattr(i->full.c_str(),attrname);
+      if(rv == -1)
+        error = errno;
+    }
+
+  return ((rv == -1) ? -error : 0);
+#else
+  return -ENOTSUP;
+#endif
+}
+
+namespace mergerfs
+{
+  namespace removexattr
+  {
+    int
+    removexattr(const char *fusepath,
+                const char *attrname)
+    {
+      const ugid::SetResetGuard  uid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return -ENOTSUP;
+
+      return _removexattr(config.policy.action,
+                          config.srcmounts,
+                          fusepath,
+                          attrname);
+    }
+  }
+}

src/removexattr.hpp

@@ -0,0 +1,33 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace removexattr
+  {
+    int
+    removexattr(const char *fusepath,
+                const char *attrname);
+  }
+}

src/rename.cpp

@@ -0,0 +1,82 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <string>
+#include <vector>
+
+#include "ugid.hpp"
+#include "fs.hpp"
+#include "config.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_rename(const Policy::Search::Func  searchFunc,
+        const vector<string>       &srcmounts,
+        const string                from,
+        const string                to)
+{
+  int rv;
+  string pathto;
+  fs::Path pathfrom;
+
+  pathfrom = searchFunc(srcmounts,from);
+  if(pathfrom.base.empty())
+    return -ENOENT;
+
+  pathto = fs::make_path(pathfrom.base,to);
+
+  rv = ::rename(pathfrom.full.c_str(),pathto.c_str());
+
+  return ((rv == -1) ? -errno : 0);
+}
+
+namespace mergerfs
+{
+  namespace rename
+  {
+    int
+    rename(const char *from,
+           const char *to)
+    {
+      const ugid::SetResetGuard  uid;
+      const config::Config      &config = config::get();
+
+      if(from == config.controlfile)
+        return -ENOENT;
+
+      return _rename(config.policy.search,
+                     config.srcmounts,
+                     from,
+                     to);
+    }
+  }
+}

src/rename.hpp

@@ -0,0 +1,33 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace rename
+  {
+    int
+    rename(const char *from,
+           const char *to);
+  }
+}

src/resources.cpp

@@ -0,0 +1,78 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+namespace mergerfs
+{
+  namespace resources
+  {
+    int
+    reset_umask(void)
+    {
+      umask(0);
+      return 0;
+    }
+
+    int
+    maxout_rlimit(int resource)
+    {
+      struct rlimit rlim;
+
+      if(geteuid() == 0)
+        {
+          rlim.rlim_cur = RLIM_INFINITY;
+          rlim.rlim_max = RLIM_INFINITY;
+        }
+      else
+        {
+          int rv;
+
+          rv = ::getrlimit(resource,&rlim);
+          if(rv == -1)
+            return -1;
+
+          rlim.rlim_cur = rlim.rlim_max;
+        }
+
+      return ::setrlimit(resource,&rlim);
+    }
+
+    int
+    maxout_rlimit_nofile(void)
+    {
+      return maxout_rlimit(RLIMIT_NOFILE);
+    }
+
+    int
+    maxout_rlimit_fsize(void)
+    {
+      return maxout_rlimit(RLIMIT_FSIZE);
+    }
+  }
+}

src/resources.hpp

@@ -0,0 +1,34 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace resources
+  {
+    int reset_umask(void);
+    int maxout_rlimit(int resource);
+    int maxout_rlimit_nofile(void);
+    int maxout_rlimit_fsize(void);
+  }
+}

src/rmdir.cpp

@@ -0,0 +1,84 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <errno.h>
+#include <unistd.h>
+
+#include <string>
+
+#include "ugid.hpp"
+#include "fs.hpp"
+#include "config.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_rmdir(const Policy::Action::Func  searchFunc,
+       const vector<string>       &srcmounts,
+       const string                fusepath)
+{
+  int rv;
+  int error;
+  vector<fs::Path> paths;
+
+  searchFunc(srcmounts,fusepath,paths);
+  if(paths.empty())
+    return -ENOENT;
+
+  rv    = -1;
+  error =  0;
+  for(vector<fs::Path>::const_iterator
+        i = paths.begin(), ei = paths.end(); i != ei; ++i)
+    {
+      rv &= ::rmdir(i->full.c_str());
+      if(rv == -1)
+        error = errno;
+    }
+
+  return ((rv == -1) ? -error : 0);
+}
+
+namespace mergerfs
+{
+  namespace rmdir
+  {
+    int
+    rmdir(const char *fusepath)
+    {
+      const ugid::SetResetGuard  uid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return -ENOTDIR;
+
+      return _rmdir(config.policy.action,
+                    config.srcmounts,
+                    fusepath);
+    }
+  }
+}

src/rmdir.hpp

@@ -0,0 +1,32 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace rmdir
+  {
+    int
+    rmdir(const char *fusepath);
+  }
+}

src/setxattr.cpp

@@ -0,0 +1,101 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <string>
+#include <vector>
+
+#include <errno.h>
+#include <sys/types.h>
+#include <attr/xattr.h>
+
+#include "config.hpp"
+#include "fs.hpp"
+#include "ugid.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_setxattr(const Policy::Action::Func  searchFunc,
+          const vector<string>       &srcmounts,
+          const string                fusepath,
+          const char                 *attrname,
+          const char                 *attrval,
+          const size_t                attrvalsize,
+          const int                   flags)
+{
+#ifndef WITHOUT_XATTR
+  int rv;
+  int error;
+  vector<fs::Path> paths;
+
+  searchFunc(srcmounts,fusepath,paths);
+  if(paths.empty())
+    return -ENOENT;
+
+  rv    = -1;
+  error =  0;
+  for(vector<fs::Path>::const_iterator
+        i = paths.begin(), ei = paths.end(); i != ei; ++i)
+    {
+      rv &= ::lsetxattr(i->full.c_str(),attrname,attrval,attrvalsize,flags);
+      if(rv == -1)
+        error = errno;
+    }
+
+  return ((rv == -1) ? -error : 0);
+#else
+  return -ENOTSUP;
+#endif
+}
+namespace mergerfs
+{
+  namespace setxattr
+  {
+    int
+    setxattr(const char *fusepath,
+             const char *attrname,
+             const char *attrval,
+             size_t      attrvalsize,
+             int         flags)
+    {
+      const ugid::SetResetGuard  uid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return -ENOTSUP;
+
+      return _setxattr(config.policy.action,
+                       config.srcmounts,
+                       fusepath,
+                       attrname,
+                       attrval,
+                       attrvalsize,
+                       flags);
+    }
+  }
+}

src/setxattr.hpp

@@ -0,0 +1,36 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace setxattr
+  {
+    int
+    setxattr(const char *fusepath,
+             const char *attrname,
+             const char *attrval,
+             size_t      attrvalsize,
+             int         flags);
+  }
+}

src/statfs.cpp

@@ -0,0 +1,160 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <sys/statvfs.h>
+#include <errno.h>
+
+#include <climits>
+#include <string>
+#include <vector>
+#include <map>
+
+#include "ugid.hpp"
+#include "config.hpp"
+
+using std::string;
+using std::vector;
+using std::map;
+using std::pair;
+using mergerfs::Policy;
+
+static
+void
+_normalize_statvfs(struct statvfs      *fsstat,
+                   const unsigned long  min_bsize,
+                   const unsigned long  min_frsize,
+                   const unsigned long  min_namemax)
+{
+  if(fsstat->f_bsize > min_bsize)
+    {
+      fsstat->f_bfree  *= fsstat->f_bsize / min_bsize;
+      fsstat->f_bavail *= fsstat->f_bsize / min_bsize;
+      fsstat->f_bsize   = min_bsize;
+    }
+
+  if(fsstat->f_frsize > min_frsize)
+    {
+      fsstat->f_blocks *= fsstat->f_frsize / min_frsize;
+      fsstat->f_frsize  = min_frsize;
+    }
+
+  if(fsstat->f_namemax > min_namemax)
+    fsstat->f_namemax = min_namemax;
+}
+
+static
+void
+_merge_statvfs(struct statvfs       * const out,
+               const struct statvfs * const in,
+               const Policy::StatFS         policy)
+{
+  switch(policy)
+    {
+    case Policy::StatFS::SumUsedMaxFree:
+      if(out->f_bfree < in->f_bfree)
+        {
+          out->f_bfree  = in->f_bfree;
+          out->f_bavail = in->f_bavail;
+        }
+      break;
+
+    default:
+    case Policy::StatFS::SumUsedSumFree:
+      out->f_bfree  += in->f_bfree;
+      out->f_bavail += in->f_bavail;
+      break;
+    }
+
+  out->f_ffree  += in->f_ffree;
+  out->f_favail += in->f_favail;
+  out->f_files  += in->f_files;
+  out->f_blocks += in->f_blocks;
+}
+
+static
+int
+_statfs(const Policy::StatFS  policy,
+        const vector<string> &srcmounts,
+        struct statvfs       &fsstat)
+{
+  unsigned long min_bsize   = ULONG_MAX;
+  unsigned long min_frsize  = ULONG_MAX;
+  unsigned long min_namemax = ULONG_MAX;
+  map<unsigned long,struct statvfs> fsstats;
+  vector<string>::const_iterator iter;
+  vector<string>::const_iterator enditer;
+
+  for(iter = srcmounts.begin(), enditer = srcmounts.end(); iter != enditer; ++iter)
+    {
+      int rv;
+      struct statvfs fsstat;
+      rv = ::statvfs(iter->c_str(),&fsstat);
+      if(rv != 0)
+        continue;
+
+      if(min_bsize > fsstat.f_bsize)
+        min_bsize = fsstat.f_bsize;
+      if(min_frsize > fsstat.f_frsize)
+        min_frsize = fsstat.f_frsize;
+      if(min_namemax > fsstat.f_namemax)
+        min_namemax = fsstat.f_namemax;
+
+      fsstats.insert(pair<unsigned long,struct statvfs>(fsstat.f_fsid,fsstat));
+    }
+
+  map<unsigned long,struct statvfs>::iterator fsstatiter    = fsstats.begin();
+  map<unsigned long,struct statvfs>::iterator endfsstatiter = fsstats.end();
+  if(fsstatiter != endfsstatiter)
+    {
+      fsstat = (fsstatiter++)->second;
+      _normalize_statvfs(&fsstat,min_bsize,min_frsize,min_namemax);
+      for(;fsstatiter != endfsstatiter;++fsstatiter)
+        {
+          _normalize_statvfs(&fsstatiter->second,min_bsize,min_frsize,min_namemax);
+          _merge_statvfs(&fsstat,&fsstatiter->second,policy);
+        }
+    }
+
+  return 0;
+}
+
+namespace mergerfs
+{
+  namespace statfs
+  {
+    int
+    statfs(const char     *fusepath,
+           struct statvfs *stat)
+    {
+      const ugid::SetResetGuard  uid;
+      const config::Config      &config = config::get();
+
+      return _statfs(config.policy.statfs,
+                     config.srcmounts,
+                     *stat);
+    }
+  }
+}

src/statfs.hpp

@@ -0,0 +1,33 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace statfs
+  {
+    int
+    statfs(const char     *fusepath,
+           struct statvfs *fsstat);
+  }
+}

src/symlink.cpp

@@ -0,0 +1,79 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <errno.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <string>
+
+#include "fs.hpp"
+#include "config.hpp"
+#include "ugid.hpp"
+
+using std::string;
+using std::vector;
+
+static
+int
+_symlink(const vector<string> &srcmounts,
+         const string          from,
+         const string          to)
+{
+  int rv;
+  fs::Path path;
+
+  path = fs::find_first(srcmounts,fs::dirname(to));
+  if(path.base.empty())
+    return -ENOENT;
+
+  path.full = fs::make_path(path.base,to);
+
+  rv = symlink(from.c_str(),path.full.c_str());
+
+  return ((rv == -1) ? -errno : 0);
+}
+
+namespace mergerfs
+{
+  namespace symlink
+  {
+    int
+    symlink(const char *oldpath,
+            const char *newpath)
+    {
+      const ugid::SetResetGuard  uid;
+      const config::Config      &config = config::get();
+
+      if(oldpath == config.controlfile ||
+         newpath == config.controlfile)
+        return -EPERM;
+
+      return _symlink(config.srcmounts,
+                      oldpath,
+                      newpath);
+    }
+  }
+}

src/symlink.hpp

@@ -0,0 +1,33 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace symlink
+  {
+    int
+    symlink(const char *oldpath,
+            const char *newpath);
+  }
+}

src/test.cpp

@@ -0,0 +1,53 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <cstdlib>
+#include <iostream>
+#include <sstream>
+
+#include <string>
+#include <vector>
+#include <map>
+
+#include <string.h>
+
+#include "config.hpp"
+#include "readdir.hpp"
+#include "fs.hpp"
+
+using std::string;
+
+namespace mergerfs
+{
+  int
+  test(const struct fuse_args         &args,
+       const mergerfs::config::Config &config)
+  {
+    return 0;
+  }
+}

src/test.hpp

@@ -0,0 +1,30 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  int
+  test(const struct fuse_args &args,
+       const mergerfs::config::Config       &config);
+}

src/truncate.cpp

@@ -0,0 +1,91 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <errno.h>
+
+#include <string>
+#include <vector>
+
+#include "ugid.hpp"
+#include "fs.hpp"
+#include "config.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_truncate(const Policy::Action::Func  searchFunc,
+          const vector<string>       &srcmounts,
+          const string                fusepath,
+          const off_t                 size)
+{
+  int rv;
+  int error;
+  vector<fs::Path> paths;
+
+  searchFunc(srcmounts,fusepath,paths);
+  if(paths.empty())
+    return -ENOENT;
+
+  rv    = -1;
+  error =  0;
+  for(vector<fs::Path>::const_iterator
+        i = paths.begin(), ei = paths.end(); i != ei; ++i)
+    {
+      rv &= ::truncate(i->full.c_str(),size);
+      if(rv == -1)
+        error = errno;
+    }
+
+  return ((rv == -1) ? -error : 0);
+}
+
+namespace mergerfs
+{
+  namespace truncate
+  {
+    int
+    truncate(const char *fusepath,
+             off_t       size)
+    {
+      const ugid::SetResetGuard  uid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return -EPERM;
+
+      return _truncate(config.policy.action,
+                       config.srcmounts,
+                       fusepath,
+                       size);
+    }
+  }
+}

src/truncate.hpp

@@ -0,0 +1,35 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <sys/types.h>
+
+namespace mergerfs
+{
+  namespace truncate
+  {
+    int
+    truncate(const char *fusepath,
+             off_t       size);
+  }
+}

src/ugid.hpp

@@ -0,0 +1,94 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#ifndef __UGID_HPP__
+#define __UGID_HPP__
+
+#include <fuse.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+namespace mergerfs
+{
+  namespace ugid
+  {
+    struct SetResetGuard
+    {
+      SetResetGuard()
+      {
+        const struct fuse_context *fc = fuse_get_context();
+
+        olduid   = ::getuid();
+        oldgid   = ::getgid();
+        oldumask = ::umask(fc->umask);
+        newuid   = fc->uid;
+        newgid   = fc->gid;
+        newumask = fc->umask;
+
+        if(olduid != newuid)
+          ::seteuid(newuid);
+        if(oldgid != newgid)
+          ::setegid(newgid);
+      }
+
+      SetResetGuard(uid_t  u,
+                    gid_t  g,
+                    mode_t m)
+      {
+        olduid   = ::getuid();
+        oldgid   = ::getgid();
+        oldumask = ::umask(m);
+        newuid   = u;
+        newgid   = g;
+        newumask = m;
+
+        if(olduid != newuid)
+          ::seteuid(newuid);
+        if(oldgid != newgid)
+          ::setegid(newgid);
+      }
+
+      ~SetResetGuard()
+      {
+        ::umask(oldumask);
+        if(olduid != newuid)
+          ::seteuid(olduid);
+        if(oldgid != newgid)
+          ::setegid(oldgid);
+      }
+
+      uid_t  olduid;
+      gid_t  oldgid;
+      mode_t oldumask;
+      uid_t  newuid;
+      gid_t  newgid;
+      mode_t newumask;
+    };
+  }
+}
+
+
+#endif /* __UGID_HPP__ */

src/unlink.cpp

@@ -0,0 +1,85 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <errno.h>
+#include <unistd.h>
+
+#include <string>
+#include <vector>
+
+#include "ugid.hpp"
+#include "fs.hpp"
+#include "config.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_unlink(const Policy::Action::Func  searchFunc,
+        const vector<string>       &srcmounts,
+        const string                fusepath)
+{
+  int rv;
+  int error;
+  vector<fs::Path> paths;
+
+  searchFunc(srcmounts,fusepath,paths);
+  if(paths.empty())
+    return -ENOENT;
+
+  rv    = -1;
+  error =  0;
+  for(vector<fs::Path>::const_iterator
+        i = paths.begin(), ei = paths.end(); i != ei; ++i)
+    {
+      rv &= ::unlink(i->full.c_str());
+      if(rv == -1)
+        error = errno;
+    }
+
+  return ((rv == -1) ? -error : 0);
+}
+
+namespace mergerfs
+{
+  namespace unlink
+  {
+    int
+    unlink(const char *fusepath)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return -EPERM;
+
+      return _unlink(config.policy.action,
+                     config.srcmounts,
+                     fusepath);
+    }
+  }
+}

src/unlink.hpp

@@ -0,0 +1,32 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace unlink
+  {
+    int
+    unlink(const char *fusepath);
+  }
+}

src/utimens.cpp

@@ -0,0 +1,88 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <errno.h>
+#include <unistd.h>
+
+#include <string>
+#include <vector>
+
+#include "ugid.hpp"
+#include "fs.hpp"
+#include "config.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_utimens(const Policy::Action::Func  searchFunc,
+         const vector<string>       &srcmounts,
+         const string                fusepath,
+         const struct timespec       ts[2])
+{
+  int rv;
+  int error;
+  vector<fs::Path> paths;
+
+  searchFunc(srcmounts,fusepath,paths);
+  if(paths.empty())
+    return -ENOENT;
+
+  rv    = -1;
+  error =  0;
+  for(vector<fs::Path>::const_iterator
+        i = paths.begin(), ei = paths.end(); i != ei; ++i)
+    {
+      rv &= ::utimensat(0,i->full.c_str(),ts,AT_SYMLINK_NOFOLLOW);
+      if(rv == -1)
+        error = errno;
+    }
+
+  return ((rv == -1) ? -error : 0);
+}
+
+namespace mergerfs
+{
+  namespace utimens
+  {
+    int
+    utimens(const char            *fusepath,
+            const struct timespec  ts[2])
+    {
+      ugid::SetResetGuard   ugid;
+      const config::Config &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return -EPERM;
+
+      return _utimens(config.policy.action,
+                      config.srcmounts,
+                      fusepath,
+                      ts);
+    }
+  }
+}

src/utimens.hpp

@@ -0,0 +1,33 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace utimens
+  {
+    int
+    utimens(const char            *fusepath,
+            const struct timespec  ts[2]);
+  }
+}

src/write.cpp

@@ -0,0 +1,163 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <fuse.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#include <string>
+#include <vector>
+#include <sstream>
+
+#include "config.hpp"
+#include "policy.hpp"
+#include "ugid.hpp"
+#include "fileinfo.hpp"
+
+using mergerfs::config::Config;
+using mergerfs::Policy;
+using std::string;
+using std::vector;
+using std::stringstream;
+
+static
+int
+_process_kv(Config       &config,
+            const string  key,
+            const string  value)
+{
+  int rv = 0;
+
+  if(key == "search")
+    {
+      rv = (Policy::Search::fromString(value) != -1) ? 0 : -EINVAL;
+      if(rv == 0)
+        config.policy.search = value;
+    }
+  else if(key == "action")
+    {
+      rv = (Policy::Action::fromString(value) != -1) ? 0 : -EINVAL;
+      if(rv == 0)
+        config.policy.action = value;
+    }
+  else if(key == "create")
+    {
+      rv = (Policy::Create::fromString(value) != -1) ? 0 : -EINVAL;
+      if(rv == 0)
+        config.policy.create = value;
+    }
+  else if(key == "statfs")
+    {
+      rv = (Policy::StatFS::fromString(value) != -1) ? 0 : -EINVAL;
+      if(rv == 0)
+        config.policy.statfs = value;
+    }
+  else
+    {
+      rv = -EINVAL;
+    }
+
+  if(rv == 0)
+    config.updateReadStr();
+
+  return rv;
+}
+
+static
+int
+_write_controlfile(Config       &config,
+                   string       &existing,
+                   const string  buf,
+                   const off_t   _offset)
+{
+  size_t bufsize      = buf.size();
+  size_t existingsize = existing.size();
+
+  if((existingsize + buf.size()) > 1024)
+    return (existing.clear(),-EINVAL);
+
+  existing += buf;
+
+  size_t nlpos = existing.find_first_of('\n',existingsize);
+  if(nlpos == string::npos)
+    return 0;
+
+  string line = existing.substr(0,nlpos);
+  existing = existing.substr(nlpos+1);
+
+  size_t equalsoffset = line.find_first_of('=');
+  if(equalsoffset == string::npos)
+    return -EINVAL;
+
+  int rv;
+  string key   = line.substr(0,equalsoffset);
+  string value = line.substr(equalsoffset+1);
+
+  rv = _process_kv(config,key,value);
+
+  return ((rv < 0) ? rv : bufsize);
+}
+
+static
+int
+_write(const int     fd,
+       const void   *buf,
+       const size_t  count,
+       const off_t   offset)
+{
+  int rv;
+
+  rv = ::pwrite(fd,buf,count,offset);
+
+  return ((rv == -1) ? -errno : rv);
+}
+
+namespace mergerfs
+{
+  namespace write
+  {
+    int
+    write(const char            *fusepath,
+          const char            *buf,
+          size_t                 count,
+          off_t                  offset,
+          struct fuse_file_info *fi)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config   = config::get();
+
+      if(fusepath == config.controlfile)
+        return _write_controlfile(config::get_writable(),
+                                  *(string*)fi->fh,
+                                  string(buf,count),
+                                  offset);
+
+      return _write(((FileInfo*)fi->fh)->fd,
+                    buf,
+                    count,
+                    offset);
+    }
+  }
+}

src/write.hpp

@@ -0,0 +1,36 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+namespace mergerfs
+{
+  namespace write
+  {
+    int
+    write(const char            *fusepath,
+          const char            *buf,
+          size_t                 count,
+          off_t                  offset,
+          struct fuse_file_info *fi);
+  }
+}