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122 lines
3.2 KiB
122 lines
3.2 KiB
/*
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ISC License
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Copyright (c) 2024, Antonio SJ Musumeci <trapexit@spawn.link>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "func_open_create_utils.hpp"
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#include "procfs_get_name.hpp"
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/*
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The kernel expects being able to issue read requests when running
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with writeback caching enabled so we must change O_WRONLY to
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O_RDWR.
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With writeback caching enabled the kernel handles O_APPEND. Could
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be an issue if the underlying file changes out of band but that is
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true of any caching.
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*/
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void
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utils::tweak_flags_writeback_cache(int *flags_)
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{
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if((*flags_ & O_ACCMODE) == O_WRONLY)
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*flags_ = ((*flags_ & ~O_ACCMODE) | O_RDWR);
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if(*flags_ & O_APPEND)
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*flags_ &= ~O_APPEND;
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}
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namespace l
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{
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static
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bool
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rdonly(const int flags_)
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{
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return ((flags_ & O_ACCMODE) == O_RDONLY);
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}
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}
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bool
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utils::calculate_flush(FlushOnClose flushonclose_,
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int const flags_)
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{
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switch(flushonclose_)
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{
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case FlushOnCloseEnum::NEVER:
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return false;
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case FlushOnCloseEnum::OPENED_FOR_WRITE:
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return !l::rdonly(flags_);
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case FlushOnCloseEnum::ALWAYS:
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return true;
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}
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return true;
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}
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void
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utils::cfg_to_ffi_flags(Config::Read &cfg_,
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int const tid_,
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fuse_file_info_t *ffi_)
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{
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switch(cfg_->cache_files)
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{
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case CacheFiles::ENUM::LIBFUSE:
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ffi_->direct_io = cfg_->direct_io;
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ffi_->keep_cache = cfg_->kernel_cache;
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ffi_->auto_cache = cfg_->auto_cache;
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break;
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case CacheFiles::ENUM::OFF:
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ffi_->direct_io = 1;
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ffi_->keep_cache = 0;
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ffi_->auto_cache = 0;
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break;
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case CacheFiles::ENUM::PARTIAL:
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ffi_->direct_io = 0;
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ffi_->keep_cache = 0;
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ffi_->auto_cache = 0;
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break;
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case CacheFiles::ENUM::FULL:
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ffi_->direct_io = 0;
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ffi_->keep_cache = 1;
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ffi_->auto_cache = 0;
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break;
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case CacheFiles::ENUM::AUTO_FULL:
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ffi_->direct_io = 0;
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ffi_->keep_cache = 0;
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ffi_->auto_cache = 1;
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break;
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case CacheFiles::ENUM::PER_PROCESS:
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std::string proc_name;
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proc_name = procfs::get_name(tid_);
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if(cfg_->cache_files_process_names.count(proc_name) == 0)
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{
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ffi_->direct_io = 1;
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ffi_->keep_cache = 0;
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ffi_->auto_cache = 0;
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}
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else
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{
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ffi_->direct_io = 0;
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ffi_->keep_cache = 0;
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ffi_->auto_cache = 0;
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}
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break;
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}
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if(cfg_->parallel_direct_writes == true)
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ffi_->parallel_direct_writes = ffi_->direct_io;
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}
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