mirror of
https://github.com/trapexit/mergerfs.git
synced 2025-02-15 19:22:45 +08:00
138 lines
3.1 KiB
C++
138 lines
3.1 KiB
C++
/*
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Copyright (c) 2016, 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 <fuse.h>
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#include "config.hpp"
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#include "errno.hpp"
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#include "fileinfo.hpp"
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#include "fs_base_write.hpp"
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#include "fs_movefile.hpp"
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#include "rwlock.hpp"
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#include "ugid.hpp"
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using namespace mergerfs;
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typedef int (*WriteFunc)(const int,const void*,const size_t,const off_t);
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static
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bool
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_out_of_space(const int error)
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{
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return ((error == ENOSPC) ||
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(error == EDQUOT));
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}
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static
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inline
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int
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_write(const int fd,
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const void *buf,
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const size_t count,
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const off_t offset)
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{
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int rv;
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rv = fs::pwrite(fd,buf,count,offset);
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if(rv == -1)
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return -errno;
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if(rv == 0)
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return 0;
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return count;
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}
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static
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inline
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int
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_write_direct_io(const int fd,
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const void *buf,
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const size_t count,
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const off_t offset)
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{
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int rv;
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rv = fs::pwrite(fd,buf,count,offset);
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if(rv == -1)
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return -errno;
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return rv;
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}
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namespace mergerfs
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{
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namespace fuse
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{
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static
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inline
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int
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write(WriteFunc func,
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const char *fusepath,
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const char *buf,
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const size_t count,
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const off_t offset,
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fuse_file_info *ffi)
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{
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int rv;
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FileInfo* fi = reinterpret_cast<FileInfo*>(ffi->fh);
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rv = func(fi->fd,buf,count,offset);
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if(_out_of_space(-rv))
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{
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const fuse_context *fc = fuse_get_context();
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const Config &config = Config::get(fc);
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if(config.moveonenospc)
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{
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const ugid::Set ugid(0,0);
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const rwlock::ReadGuard readlock(&config.srcmountslock);
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rv = fs::movefile(config.srcmounts,fusepath,count,fi->fd);
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if(rv == -1)
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return -ENOSPC;
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rv = func(fi->fd,buf,count,offset);
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}
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}
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return rv;
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}
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int
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write(const char *fusepath,
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const char *buf,
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size_t count,
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off_t offset,
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fuse_file_info *ffi)
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{
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return write(_write,fusepath,buf,count,offset,ffi);
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}
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int
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write_direct_io(const char *fusepath,
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const char *buf,
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size_t count,
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off_t offset,
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fuse_file_info *ffi)
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{
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return write(_write_direct_io,fusepath,buf,count,offset,ffi);
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}
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}
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}
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