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add cache.writeback to xattrs

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This commit is contained in:
Antonio SJ Musumeci 2020-02-12 14:15:31 -05:00
parent 4cb866cee9
commit 576ff3694e
4 changed files with 96 additions and 78 deletions
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90
src/fuse_open.cpp
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@ -35,19 +35,58 @@ typedef Config::CacheFiles CacheFiles;
namespace l
{
/*
The kernel expects being able to issue read requests when running
with writeback caching enabled so we must change O_WRONLY to
O_RDWR.
With writeback caching enabled the kernel handles O_APPEND. Could
be an issue if the underlying file changes out of band but that is
true of any caching.
*/
static
int
tweak_flags_writeback_cache(const int flags_)
void
tweak_flags_writeback_cache(int *flags_)
{
int flags;
if((*flags_ & O_ACCMODE) == O_WRONLY)
*flags_ = ((*flags_ & ~O_ACCMODE) | O_RDWR);
if(*flags_ & O_APPEND)
*flags_ &= ~O_APPEND;
}
flags = flags_;
if((flags & O_ACCMODE) == O_WRONLY)
flags = ((flags & ~O_ACCMODE) | O_RDWR);
if(flags & O_APPEND)
flags &= ~O_APPEND;
return flags;
static
void
config_to_ffi_flags(const Config &config_,
fuse_file_info *ffi_)
{
switch(config_.cache_files)
{
case CacheFiles::LIBFUSE:
ffi_->direct_io = config_.direct_io;
ffi_->keep_cache = config_.kernel_cache;
ffi_->auto_cache = config_.auto_cache;
break;
case CacheFiles::OFF:
ffi_->direct_io = 1;
ffi_->keep_cache = 0;
ffi_->auto_cache = 0;
break;
case CacheFiles::PARTIAL:
ffi_->direct_io = 0;
ffi_->keep_cache = 0;
ffi_->auto_cache = 0;
break;
case CacheFiles::FULL:
ffi_->direct_io = 0;
ffi_->keep_cache = 1;
ffi_->auto_cache = 0;
break;
case CacheFiles::AUTO_FULL:
ffi_->direct_io = 0;
ffi_->keep_cache = 0;
ffi_->auto_cache = 1;
break;
}
}
static
@ -108,37 +147,10 @@ namespace FUSE
const ugid::Set ugid(fc->uid,fc->gid);
const rwlock::ReadGuard readlock(&config.branches_lock);
switch(config.cache_files)
{
case CacheFiles::LIBFUSE:
ffi_->direct_io = config.direct_io;
ffi_->keep_cache = config.kernel_cache;
ffi_->auto_cache = config.auto_cache;
break;
case CacheFiles::OFF:
ffi_->direct_io = 1;
ffi_->keep_cache = 0;
ffi_->auto_cache = 0;
break;
case CacheFiles::PARTIAL:
ffi_->direct_io = 0;
ffi_->keep_cache = 0;
ffi_->auto_cache = 0;
break;
case CacheFiles::FULL:
ffi_->direct_io = 0;
ffi_->keep_cache = 1;
ffi_->auto_cache = 0;
break;
case CacheFiles::AUTO_FULL:
ffi_->direct_io = 0;
ffi_->keep_cache = 0;
ffi_->auto_cache = 1;
break;
}
l::config_to_ffi_flags(config,ffi_);
if(config.writeback_cache)
ffi_->flags = l::tweak_flags_writeback_cache(ffi_->flags);
l::tweak_flags_writeback_cache(&ffi_->flags);
return l::open(config.open,
config.open_cache,