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set direct_io per open/create, now runtime configurable

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This commit is contained in:
Antonio SJ Musumeci 2019-01-09 00:01:52 -05:00
parent c36bc5320d
commit 87b2795f2b
12 changed files with 336 additions and 334 deletions
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195
src/write.cpp
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@ -33,119 +33,116 @@ using std::vector;
typedef int (*WriteFunc)(const int,const void*,const size_t,const off_t);
static
bool
_out_of_space(const int error)
namespace local
{
return ((error == ENOSPC) ||
(error == EDQUOT));
static
bool
out_of_space(const int error_)
{
return ((error_ == ENOSPC) ||
(error_ == EDQUOT));
}
static
int
write_regular(const int fd_,
const void *buf_,
const size_t count_,
const off_t offset_)
{
int rv;
rv = fs::pwrite(fd_,buf_,count_,offset_);
if(rv == -1)
return -errno;
if(rv == 0)
return 0;
return count_;
}
static
int
write_direct_io(const int fd_,
const void *buf_,
const size_t count_,
const off_t offset_)
{
int rv;
rv = fs::pwrite(fd_,buf_,count_,offset_);
if(rv == -1)
return -errno;
return rv;
}
static
int
write(WriteFunc func_,
const char *buf_,
const size_t count_,
const off_t offset_,
fuse_file_info *ffi_)
{
int rv;
FileInfo* fi;
fi = reinterpret_cast<FileInfo*>(ffi_->fh);
rv = func_(fi->fd,buf_,count_,offset_);
if(local::out_of_space(-rv))
{
const fuse_context *fc = fuse_get_context();
const Config &config = Config::get(fc);
if(config.moveonenospc)
{
vector<string> paths;
const ugid::Set ugid(0,0);
const rwlock::ReadGuard readlock(&config.branches_lock);
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_);
}
}
return rv;
}
}
static
inline
int
_write(const int fd,
const void *buf,
const size_t count,
const off_t offset)
{
int rv;
rv = fs::pwrite(fd,buf,count,offset);
if(rv == -1)
return -errno;
if(rv == 0)
return 0;
return count;
}
static
inline
int
_write_direct_io(const int fd,
const void *buf,
const size_t count,
const off_t offset)
{
int rv;
rv = fs::pwrite(fd,buf,count,offset);
if(rv == -1)
return -errno;
return rv;
}
namespace mergerfs
{
namespace fuse
{
static
inline
int
write(WriteFunc func,
const char *buf,
const size_t count,
const off_t offset,
fuse_file_info *ffi)
write(const char *fusepath_,
const char *buf_,
size_t count_,
off_t offset_,
fuse_file_info *ffi_)
{
int rv;
FileInfo* fi = reinterpret_cast<FileInfo*>(ffi->fh);
WriteFunc wf;
rv = func(fi->fd,buf,count,offset);
if(_out_of_space(-rv))
{
const fuse_context *fc = fuse_get_context();
const Config &config = Config::get(fc);
wf = ((ffi_->direct_io) ?
local::write_direct_io :
local::write_regular);
if(config.moveonenospc)
{
vector<string> paths;
const ugid::Set ugid(0,0);
const rwlock::ReadGuard readlock(&config.branches_lock);
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);
}
}
return rv;
return local::write(wf,buf_,count_,offset_,ffi_);
}
int
write(const char *fusepath,
const char *buf,
size_t count,
off_t offset,
fuse_file_info *ffi)
write_null(const char *fusepath_,
const char *buf_,
size_t count_,
off_t offset_,
fuse_file_info *ffi_)
{
return write(_write,buf,count,offset,ffi);
}
int
write_direct_io(const char *fusepath,
const char *buf,
size_t count,
off_t offset,
fuse_file_info *ffi)
{
return write(_write_direct_io,buf,count,offset,ffi);
}
int
write_null(const char *fusepath,
const char *buf,
size_t count,
off_t offset,
fuse_file_info *ffi)
{
return count;
return count_;
}
}
}