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authorMiklos Szeredi <mszeredi@suse.cz>2007-10-18 03:07:05 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:37:31 -0700
commit0e9663ee452ffce0d429656ebbcfe69417a30e92 (patch)
treea72825f122c9e38d4adc42ebcfd127f366da4a0f /fs/fuse/inode.c
parentf33321141b273d60cbb3a8f56a5489baad82ba5e (diff)
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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.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 49d716036ea..9a68d697084 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