moveonenospc: enhance the feature to allow using a policy

Just like functions you can now set a policy for moveonfreenospc. This
allows for more flexibility.

For backwards compatibility moveonfreenospc=true is converted to
moveonfreenospc=mfs.

minfreespace does apply which is slightly different from original behavior.

README.md

@@ -1,6 +1,6 @@
 % mergerfs(1) mergerfs user manual
 % Antonio SJ Musumeci <trapexit@spawn.link>
-% 2020-06-28
+% 2020-07-14
 
 # NAME
 
@@ -96,7 +96,7 @@ See the mergerfs [wiki for real world deployments](https://github.com/trapexit/m
 * **branches**: Colon delimited list of branches.
 * **allow_other**: A libfuse option which allows users besides the one which ran mergerfs to see the filesystem. This is required for most use-cases.
 * **minfreespace=SIZE**: The minimum space value used for creation policies. Understands 'K', 'M', and 'G' to represent kilobyte, megabyte, and gigabyte respectively. (default: 4G)
-* **moveonenospc=BOOL**: When enabled if a **write** fails with **ENOSPC** (no space left on device) or **EDQUOT** (disk quota exceeded) a scan of all drives will be done looking for the drive with the most free space which is at least the size of the file plus the amount which failed to write. An attempt to move the file to that drive will occur (keeping all metadata possible) and if successful the original is unlinked and the write retried. (default: false)
+* **moveonenospc=BOOL|POLICY**: When enabled if a **write** fails with **ENOSPC** (no space left on device) or **EDQUOT** (disk quota exceeded) the policy selected will run to find a new location for the file. An attempt to move the file to that branch will occur (keeping all metadata possible) and if successful the original is unlinked and the write retried. (default: false, true = mfs)
 * **use_ino**: Causes mergerfs to supply file/directory inodes rather than libfuse. While not a default it is recommended it be enabled so that linked files share the same inode value.
 * **inodecalc=passthrough|path-hash|devino-hash|hybrid-hash**: Selects the inode calculation algorithm. (default: hybrid-hash)
 * **dropcacheonclose=BOOL**: When a file is requested to be closed call `posix_fadvise` on it first to instruct the kernel that we no longer need the data and it can drop its cache. Recommended when **cache.files=partial|full|auto-full** to limit double caching. (default: false)

man/mergerfs.1

@@ -1,7 +1,7 @@
 .\"t
 .\" Automatically generated by Pandoc 1.19.2.4
 .\"
-.TH "mergerfs" "1" "2020\-06\-28" "mergerfs user manual" ""
+.TH "mergerfs" "1" "2020\-07\-14" "mergerfs user manual" ""
 .hy
 .SH NAME
 .PP
@@ -131,15 +131,14 @@ Understands \[aq]K\[aq], \[aq]M\[aq], and \[aq]G\[aq] to represent
 kilobyte, megabyte, and gigabyte respectively.
 (default: 4G)
 .IP \[bu] 2
-\f[B]moveonenospc=BOOL\f[]: When enabled if a \f[B]write\f[] fails with
-\f[B]ENOSPC\f[] (no space left on device) or \f[B]EDQUOT\f[] (disk quota
-exceeded) a scan of all drives will be done looking for the drive with
-the most free space which is at least the size of the file plus the
-amount which failed to write.
-An attempt to move the file to that drive will occur (keeping all
+\f[B]moveonenospc=BOOL|POLICY\f[]: When enabled if a \f[B]write\f[]
+fails with \f[B]ENOSPC\f[] (no space left on device) or \f[B]EDQUOT\f[]
+(disk quota exceeded) the policy selected will run to find a new
+location for the file.
+An attempt to move the file to that branch will occur (keeping all
 metadata possible) and if successful the original is unlinked and the
 write retried.
-(default: false)
+(default: false, true = mfs)
 .IP \[bu] 2
 \f[B]use_ino\f[]: Causes mergerfs to supply file/directory inodes rather
 than libfuse.

src/config.hpp

@@ -19,6 +19,7 @@
 #include "branch.hpp"
 #include "config_inodecalc.hpp"
 #include "config_readdir.hpp"
+#include "config_moveonenospc.hpp"
 #include "enum.hpp"
 #include "errno.hpp"
 #include "func_category.hpp"
@@ -109,7 +110,7 @@ public:
   ConfigBOOL     link_cow;
   ConfigUINT64   minfreespace;
   ConfigSTR      mount;
-  ConfigBOOL     moveonenospc;
+  MoveOnENOSPC   moveonenospc;
   ConfigBOOL     nullrw;
   ConfigUINT64   pid;
   ConfigBOOL     posix_acl;

src/config_moveonenospc.cpp

@@ -0,0 +1,54 @@
+/*
+  ISC License
+
+  Copyright (c) 2020, Antonio SJ Musumeci <trapexit@spawn.link>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include "ef.hpp"
+#include "from_string.hpp"
+#include "config_moveonenospc.hpp"
+
+int
+MoveOnENOSPC::from_string(const std::string &s_)
+{
+  int rv;
+  std::string s;
+  const Policy *tmp;
+
+  rv = str::from(s_,&enabled);
+  if((rv == 0) && (enabled == true))
+    s = "mfs";
+  ef(rv != 0)
+    s = s_;
+  else
+    return 0;
+
+  tmp = &Policy::find(s);
+  if(tmp == Policy::invalid)
+    return -EINVAL;
+
+  policy  = tmp;
+  enabled = true;
+
+  return 0;
+}
+
+std::string
+MoveOnENOSPC::to_string(void) const
+{
+  if(enabled)
+    return policy->to_string();
+  return "false";
+}

src/config_moveonenospc.hpp

@@ -0,0 +1,44 @@
+/*
+  ISC License
+
+  Copyright (c) 2020, Antonio SJ Musumeci <trapexit@spawn.link>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#pragma once
+
+#include "policy.hpp"
+#include "tofrom_string.hpp"
+
+#include <string>
+
+class MoveOnENOSPC : public ToFromString
+{
+public:
+  MoveOnENOSPC(const bool enabled_)
+    : enabled(enabled_)
+  {
+    policy = (enabled ?
+              &Policy::mfs :
+              &Policy::invalid);
+  }
+
+public:
+  int from_string(const std::string &s);
+  std::string to_string() const;
+
+public:
+  bool enabled;
+  const Policy *policy;
+};

src/fs.hpp

@@ -31,11 +31,6 @@ namespace fs
                     const char           *fusepath_,
                     vector<string>       &paths_);
 
-  int findonfs(const vector<string> &basepaths_,
-               const string         &fusepath_,
-               const int             fd_,
-               string               &basepath_);
-
   void realpathize(vector<string> &strs_);
 
   int getfl(const int fd_);

src/fs_acl.cpp

@@ -33,7 +33,7 @@ namespace fs
       int rv;
       std::string dirpath;
 
-      dirpath = fs::path::dirname(&fullpath_);
+      dirpath = fs::path::dirname(fullpath_);
 
       rv = fs::lgetxattr(dirpath,POSIX_ACL_DEFAULT_XATTR,NULL,0);
 

src/fs_copydata_copy_file_range.cpp

@@ -28,22 +28,24 @@ namespace l
                            uint64_t  size_)
   {
     int64_t  rv;
-    uint64_t len;
+    uint64_t nleft;
     int64_t  src_off;
     int64_t  dst_off;
 
     src_off = 0;
     dst_off = 0;
-    len     = size_;
+    nleft   = size_;
     do
       {
-        rv = fs::copy_file_range(src_fd_,&src_off,dst_fd_,&dst_off,len,0);
+        rv = fs::copy_file_range(src_fd_,&src_off,dst_fd_,&dst_off,nleft,0);
+        if((rv == -1) && (errno == EINTR))
+          continue;
         if(rv == -1)
           return -1;
 
-        len -= rv;
+        nleft -= rv;
       }
-    while((len > 0) && (rv > 0));
+    while(nleft > 0);
 
     return size_;
   }

src/fs_copydata_readwrite.cpp

@@ -30,26 +30,26 @@ namespace l
   int
   writen(const int     fd_,
          const char   *buf_,
-         const size_t  count_)
+         const size_t  size_)
   {
+    ssize_t rv;
     size_t nleft;
-    ssize_t nwritten;
 
-    nleft = count_;
+    nleft = size_;
     do
       {
-        nwritten = fs::write(fd_,buf_,nleft);
-        if((nwritten == -1) && (errno == EINTR))
+        rv = fs::write(fd_,buf_,nleft);
+        if((rv == -1) && (errno == EINTR))
           continue;
-        if(nwritten == -1)
+        if(rv == -1)
           return -1;
 
-        nleft -= nwritten;
-        buf_  += nwritten;
+        nleft -= rv;
+        buf_  += rv;
       }
     while(nleft > 0);
 
-    return count_;
+    return size_;
   }
 
   static

src/fs_file_size.cpp

@@ -0,0 +1,37 @@
+/*
+  ISC License
+
+  Copyright (c) 2020, Antonio SJ Musumeci <trapexit@spawn.link>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include "fs_base_stat.hpp"
+
+#include <stdint.h>
+
+namespace fs
+{
+  int64_t
+  file_size(const int fd_)
+  {
+    int rv;
+    struct stat st;
+
+    rv = fs::fstat(fd_,&st);
+    if(rv == -1)
+      return -1;
+
+    return st.st_size;
+  }
+}

src/fs_file_size.hpp

@@ -0,0 +1,27 @@
+/*
+  ISC License
+
+  Copyright (c) 2020, Antonio SJ Musumeci <trapexit@spawn.link>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#pragma once
+
+#include <stdint.h>
+
+namespace fs
+{
+  int64_t
+  file_size(const int fd);
+}

src/fs_findonfs.cpp

@@ -0,0 +1,65 @@
+/*
+  ISC License
+
+  Copyright (c) 2020, Antonio SJ Musumeci <trapexit@spawn.link>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include "branch.hpp"
+#include "fs_base_stat.hpp"
+#include "fs_path.hpp"
+
+#include <string>
+
+namespace fs
+{
+  int
+  findonfs(const Branches    &branches_,
+           const std::string &fusepath_,
+           const int          fd_,
+           std::string       *basepath_)
+  {
+    int rv;
+    dev_t dev;
+    struct stat st;
+    std::string fullpath;
+    const Branch *branch;
+    const rwlock::ReadGuard guard(&branches_.lock);
+
+    rv = fs::fstat(fd_,&st);
+    if(rv == -1)
+      return -1;
+
+    dev = st.st_dev;
+    for(size_t i = 0, ei = branches_.size(); i != ei; i++)
+      {
+        branch = &branches_[i];
+
+        fullpath = fs::path::make(branch->path,fusepath_);
+
+        rv = fs::lstat(fullpath,&st);
+        if(rv == -1)
+          continue;
+
+        if(st.st_dev != dev)
+          continue;
+
+        *basepath_ = branch->path;
+
+        return 0;
+      }
+
+    return (errno=ENOENT,-1);
+  }
+}

src/fs_base_mkstemp.hpp → src/fs_findonfs.hpp

@@ -1,7 +1,7 @@
 /*
   ISC License
 
-  Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link>
+  Copyright (c) 2020, Antonio SJ Musumeci <trapexit@spawn.link>
 
   Permission to use, copy, modify, and/or distribute this software for any
   purpose with or without fee is hereby granted, provided that the above
@@ -18,30 +18,15 @@
 
 #pragma once
 
-#include <string>
+#include "branch.hpp"
 
-#include <stdlib.h>
-#include <string.h>
+#include <string>
 
 namespace fs
 {
-  static
-  inline
   int
-  mkstemp(std::string &filepath_)
-  {
-    int fd;
-    char buf[filepath_.size()+8];
-
-    strcpy(buf,filepath_.c_str());
-    strcpy(buf+filepath_.size(),".XXXXXX");
-
-    fd = ::mkstemp(buf);
-    if(fd == -1)
-      return -1;
-
-    filepath_ = buf;
-
-    return fd;
-  }
+  findonfs(const Branches    &branches,
+           const std::string &fusepath,
+           const int          fd,
+           std::string       *basepath);
 }

src/fs_has_space.cpp

@@ -0,0 +1,41 @@
+/*
+  ISC License
+
+  Copyright (c) 2020, Antonio SJ Musumeci <trapexit@spawn.link>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include "fs_base_statvfs.hpp"
+#include "statvfs_util.hpp"
+
+#include <string>
+
+#include <stdint.h>
+
+namespace fs
+{
+  bool
+  has_space(const std::string &str_,
+            const int64_t      size_)
+  {
+    int rv;
+    struct statvfs st;
+
+    rv = fs::statvfs(str_,&st);
+    if(rv == -1)
+      return false;
+
+    return (StatVFS::spaceavail(st) > size_);
+  }
+}

src/fs_has_space.hpp

@@ -0,0 +1,30 @@
+/*
+  ISC License
+
+  Copyright (c) 2020, Antonio SJ Musumeci <trapexit@spawn.link>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#pragma once
+
+#include <string>
+
+#include <stdint.h>
+
+namespace fs
+{
+  bool
+  has_space(const std::string &str,
+            const int64_t      size);
+}

src/fs_mktemp.cpp

@@ -19,13 +19,16 @@
 #include "errno.hpp"
 #include "fs_base_open.hpp"
 
-#include <fcntl.h>
-#include <string.h>
-
 #include <cstdlib>
+#include <string>
+
+#include <limits.h>
 
 using std::string;
 
+#define PADLEN 6
+#define MAX_ATTEMPTS 10
+
 static
 string
 generate_tmp_path(const string &base_)
@@ -33,8 +36,10 @@ generate_tmp_path(const string &base_)
   string tmp;
 
   tmp = base_;
-  tmp += '_';
-  for(int i = 0; i < 6; i++)
+  if((tmp.size() + PADLEN + 1) > PATH_MAX)
+    tmp.resize(tmp.size() - PADLEN - 1);
+  tmp += '.';
+  for(int i = 0; i < PADLEN; i++)
     tmp += ('A' + (std::rand() % 26));
 
   return tmp;
@@ -52,7 +57,7 @@ namespace fs
     string tmppath;
 
     fd    = -1;
-    count = 10;
+    count = MAX_ATTEMPTS;
     flags = (flags_ | O_EXCL | O_CREAT);
     while(count-- > 0)
       {

src/fs_movefile.cpp

@@ -14,81 +14,90 @@
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
-#include <fcntl.h>
-#include <stdlib.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include <string>
-#include <vector>
-
 #include "errno.hpp"
 #include "fs.hpp"
-#include "fs_base_open.hpp"
 #include "fs_base_close.hpp"
-#include "fs_base_mkstemp.hpp"
+#include "fs_base_open.hpp"
 #include "fs_base_rename.hpp"
-#include "fs_base_unlink.hpp"
 #include "fs_base_stat.hpp"
+#include "fs_base_unlink.hpp"
 #include "fs_clonefile.hpp"
 #include "fs_clonepath.hpp"
+#include "fs_file_size.hpp"
+#include "fs_findonfs.hpp"
+#include "fs_has_space.hpp"
+#include "fs_mktemp.hpp"
 #include "fs_path.hpp"
+#include "policy.hpp"
+#include "ugid.hpp"
+
+#include <string>
+#include <vector>
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
 
 using std::string;
 using std::vector;
 
-namespace fs
+namespace l
 {
+  static
   int
-  movefile(const vector<string> &basepaths,
-           const string         &fusepath,
-           const size_t          additional_size,
-           int                  &origfd)
+  movefile(Policy::Func::Create  createFunc_,
+           const Branches       &branches_,
+           const uint64_t        minfreepsace_,
+           const string         &fusepath_,
+           int                  *origfd_)
   {
     int rv;
     int fdin;
     int fdout;
     int fdin_flags;
+    int64_t fdin_size;
     string fusedir;
     string fdin_path;
-    string fdout_path;
     string fdout_temp;
-    struct stat fdin_st;
+    vector<string> fdout_path;
 
-    fdin = origfd;
+    fdin = *origfd_;
 
-    rv = fs::fstat(fdin,&fdin_st);
-    if(rv == -1)
+    fdin_flags = fs::getfl(fdin);
+    if(fdin_flags == -1)
       return -1;
 
-    fdin_flags = fs::getfl(fdin);
+    rv = fs::findonfs(branches_,fusepath_,fdin,&fdin_path);
     if(rv == -1)
       return -1;
 
-    rv = fs::findonfs(basepaths,fusepath,fdin,fdin_path);
+    rv = createFunc_(branches_,fusepath_,minfreepsace_,&fdout_path);
     if(rv == -1)
       return -1;
 
-    fdin_st.st_size += additional_size;
-    rv = fs::mfs(basepaths,fdin_st.st_size,fdout_path);
-    if(rv == -1)
+    fdin_size = fs::file_size(fdin);
+    if(fdin_size == -1)
       return -1;
 
-    fusedir = fs::path::dirname(&fusepath);
+    if(fs::has_space(fdout_path[0],fdin_size) == false)
+      return (errno=ENOSPC,-1);
+
+    fusedir = fs::path::dirname(fusepath_);
 
-    rv = fs::clonepath(fdin_path,fdout_path,fusedir);
+    rv = fs::clonepath(fdin_path,fdout_path[0],fusedir);
     if(rv == -1)
       return -1;
 
-    fs::path::append(fdin_path,fusepath);
+    fs::path::append(fdin_path,fusepath_);
     fdin = fs::open(fdin_path,O_RDONLY);
     if(fdin == -1)
       return -1;
 
-    fs::path::append(fdout_path,fusepath);
-    fdout_temp = fdout_path;
-    fdout = fs::mkstemp(fdout_temp);
+    fs::path::append(fdout_path[0],fusepath_);
+    fdout_temp = fdout_path[0];
+    fdout = fs::mktemp(fdout_temp,fdin_flags);
     if(fdout == -1)
       return -1;
 
@@ -96,18 +105,14 @@ namespace fs
     if(rv == -1)
       goto cleanup;
 
-    rv = fs::setfl(fdout,fdin_flags);
-    if(rv == -1)
-      goto cleanup;
-
-    rv = fs::rename(fdout_temp,fdout_path);
+    rv = fs::rename(fdout_temp,fdout_path[0]);
     if(rv == -1)
       goto cleanup;
 
     // should we care if it fails?
     fs::unlink(fdin_path);
 
-    std::swap(origfd,fdout);
+    std::swap(*origfd_,fdout);
     fs::close(fdin);
     fs::close(fdout);
 
@@ -124,3 +129,28 @@ namespace fs
     return -1;
   }
 }
+
+namespace fs
+{
+  int
+  movefile(const Policy   *policy_,
+           const Branches &basepaths_,
+           const uint64_t  minfreepsace_,
+           const string   &fusepath_,
+           int            *origfd_)
+  {
+    return l::movefile(policy_,basepaths_,minfreepsace_,fusepath_,origfd_);
+  }
+
+  int
+  movefile_as_root(const Policy   *policy_,
+                   const Branches &basepaths_,
+                   const uint64_t  minfreepsace_,
+                   const string   &fusepath_,
+                   int            *origfd_)
+  {
+    const ugid::Set ugid(0,0);
+
+    return fs::movefile(policy_,basepaths_,minfreepsace_,fusepath_,origfd_);
+  }
+}

src/fs_movefile.hpp

@@ -16,14 +16,24 @@
 
 #pragma once
 
+#include "branch.hpp"
+#include "policy.hpp"
+
 #include <string>
-#include <vector>
 
 namespace fs
 {
   int
-  movefile(const std::vector<std::string> &basepaths,
+  movefile(const Policy      *policy,
+           const Branches    &branches,
+           const uint64_t     minfreepsace,
+           const std::string &fusepath,
+           int               *origfd);
+
+  int
+  movefile_as_root(const Policy      *policy,
+                   const Branches    &branches,
+                   const uint64_t     minfreepsace,
                    const std::string &fusepath,
-           const size_t                    additional_size,
-           int                            &origfd);
+                   int               *origfd);
 }

src/fs_path.cpp

@@ -34,17 +34,17 @@ namespace fs
     {
       string path(path_);
 
-      return fs::path::dirname(&path);
+      return fs::path::dirname(path);
     }
 
     string
-    dirname(const string *path_)
+    dirname(const string &path_)
     {
       string rv;
       string::reverse_iterator i;
       string::reverse_iterator ei;
 
-      rv = *path_;
+      rv = path_;
 
       i  = rv.rbegin();
       ei = rv.rend();

src/fs_path.hpp

@@ -25,8 +25,8 @@ namespace fs
   {
     using std::string;
 
-    string dirname(const char *path_);
-    string dirname(const string *path_);
+    string dirname(const char *path);
+    string dirname(const string &path);
 
     string basename(const string &path);
 

src/fuse_write.cpp

@@ -75,6 +75,32 @@ namespace l
     return rv;
   }
 
+  static
+  int
+  move_and_write(WriteFunc     func_,
+                 const char   *buf_,
+                 const size_t  count_,
+                 const off_t   offset_,
+                 FileInfo     *fi_,
+                 int           err_)
+  {
+    int rv;
+    const Config &config = Config::ro();
+
+    if(config.moveonenospc.enabled == false)
+      return err_;
+
+    rv = fs::movefile_as_root(config.moveonenospc.policy,
+                              config.branches,
+                              config.minfreespace,
+                              fi_->fusepath,
+                              &fi_->fd);
+    if(rv == -1)
+      return err_;
+
+    return func_(fi_->fd,buf_,count_,offset_);
+  }
+
   static
   int
   write(WriteFunc       func_,
@@ -90,23 +116,7 @@ namespace l
 
     rv = func_(fi->fd,buf_,count_,offset_);
     if(l::out_of_space(-rv))
-      {
-        const Config &config = Config::ro();
-
-        if(config.moveonenospc)
-          {
-            vector<string> paths;
-            const ugid::Set ugid(0,0);
-
-            config.branches.to_paths(paths);
-
-            rv = fs::movefile(paths,fi->fusepath,count_,fi->fd);
-            if(rv == -1)
-              return -ENOSPC;
-
-            rv = func_(fi->fd,buf_,count_,offset_);
-          }
-      }
+      rv = l::move_and_write(func_,buf_,count_,offset_,fi,rv);
 
     return rv;
   }

src/fuse_write_buf.cpp

@@ -19,10 +19,8 @@
 #include "fileinfo.hpp"
 #include "fs_movefile.hpp"
 #include "fuse_write.hpp"
-#include "policy.hpp"
-#include "ugid.hpp"
 
-#include <fuse.h>
+#include "fuse.h"
 
 #include <string>
 #include <vector>
@@ -63,22 +61,24 @@ namespace l
 
   static
   int
-  move_and_write_buf(fuse_bufvec *src_,
+  move_and_write_buf(FileInfo    *fi_,
+                     fuse_bufvec *src_,
                      off_t        offset_,
-                     FileInfo    *fi_)
+                     int          err_)
   {
     int rv;
-    uint64_t extra;
-    vector<string> paths;
-    const ugid::Set ugid(0,0);
     const Config &config = Config::ro();
 
-    config.branches.to_paths(paths);
+    if(config.moveonenospc.enabled == false)
+      return err_;
 
-    extra = fuse_buf_size(src_);
-    rv = fs::movefile(paths,fi_->fusepath,extra,fi_->fd);
+    rv = fs::movefile_as_root(config.moveonenospc.policy,
+                              config.branches,
+                              config.minfreespace,
+                              fi_->fusepath,
+                              &fi_->fd);
     if(rv == -1)
-      return -ENOSPC;
+      return err_;
 
     return l::write_buf(fi_->fd,src_,offset_);
   }
@@ -96,7 +96,7 @@ namespace FUSE
 
     rv = l::write_buf(fi->fd,src_,offset_);
     if(l::out_of_space(-rv))
-      rv = l::move_and_write_buf(src_,offset_,fi);
+      rv = l::move_and_write_buf(fi,src_,offset_,rv);
 
     return rv;
   }

src/statvfs_util.hpp

@@ -33,7 +33,7 @@ namespace StatVFS
 
   static
   inline
-  uint64_t
+  int64_t
   spaceavail(const struct statvfs &st)
   {
     return (st.f_frsize * st.f_bavail);
@@ -41,7 +41,7 @@ namespace StatVFS
 
   static
   inline
-  uint64_t
+  int64_t
   spaceused(const struct statvfs &st)
   {
     return (st.f_frsize * (st.f_blocks - st.f_bavail));