diff options
| author | Miklos Szeredi <mszeredi@suse.cz> | 2007-10-18 03:07:05 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-18 14:37:31 -0700 |
| commit | 0e9663ee452ffce0d429656ebbcfe69417a30e92 (patch) | |
| tree | a72825f122c9e38d4adc42ebcfd127f366da4a0f /fs/fuse/inode.c | |
| parent | f33321141b273d60cbb3a8f56a5489baad82ba5e (diff) | |
fuse: add blksize field to fuse_attr
There are cases when the filesystem will be passed the buffer from a single
read or write call, namely:
1) in 'direct-io' mode (not O_DIRECT), read/write requests don't go
through the page cache, but go directly to the userspace fs
2) currently buffered writes are done with single page requests, but
if Nick's ->perform_write() patch goes it, it will be possible to
do larger write requests. But only if the original write() was
also bigger than a page.
In these cases the filesystem might want to give a hint to the app
about the optimal I/O size.
Allow the userspace filesystem to supply a blksize value to be returned by
stat() and friends. If the field is zero, it defaults to the old
PAGE_CACHE_SIZE value.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fuse/inode.c')
| -rw-r--r-- | fs/fuse/inode.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 49d716036ea7..9a68d6970845 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -148,6 +148,11 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, inode->i_ctime.tv_sec = attr->ctime; inode->i_ctime.tv_nsec = attr->ctimensec; + if (attr->blksize != 0) + inode->i_blkbits = ilog2(attr->blksize); + else + inode->i_blkbits = inode->i_sb->s_blocksize_bits; + /* * Don't set the sticky bit in i_mode, unless we want the VFS * to check permissions. This prevents failures due to the |