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| author | Miklos Szeredi <mszeredi@suse.cz> | 2008-04-30 00:54:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 08:29:51 -0700 |
| commit | e5d9a0df07484d6d191756878c974e4307fb24ce (patch) | |
| tree | b3117ed75242e523dd7c2ff9fc0878b78c7fcb0c /fs/fuse/file.c | |
| parent | 5c5c5e51b26413d50a9efae2ca7d6c5c6cd453ac (diff) | |
| download | lwn-e5d9a0df07484d6d191756878c974e4307fb24ce.tar.gz lwn-e5d9a0df07484d6d191756878c974e4307fb24ce.zip | |
fuse: fix max i/o size calculation
Fix a bug that Werner Baumann reported: fuse can send a bigger write request
than the maximum specified. This only affected direct_io operation.
In addition set a sane minimum for the max_read and max_write tunables, so I/O
always makes some progress.
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/file.c')
| -rw-r--r-- | fs/fuse/file.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index a02418c89d4b..2d3649e42599 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -966,14 +966,15 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf, while (count) { size_t nres; - size_t nbytes = min(count, nmax); - int err = fuse_get_user_pages(req, buf, nbytes, !write); + size_t nbytes_limit = min(count, nmax); + size_t nbytes; + int err = fuse_get_user_pages(req, buf, nbytes_limit, !write); if (err) { res = err; break; } nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset; - nbytes = min(count, nbytes); + nbytes = min(nbytes_limit, nbytes); if (write) nres = fuse_send_write(req, file, inode, pos, nbytes, current->files); |