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authorMiklos Szeredi <mszeredi@suse.cz>2008-04-30 00:54:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 08:29:51 -0700
commite5d9a0df07484d6d191756878c974e4307fb24ce (patch)
treeb3117ed75242e523dd7c2ff9fc0878b78c7fcb0c /fs/fuse
parent5c5c5e51b26413d50a9efae2ca7d6c5c6cd453ac (diff)
downloadconfigs-e5d9a0df07484d6d191756878c974e4307fb24ce.tar.gz
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')
-rw-r--r--fs/fuse/file.c7
-rw-r--r--fs/fuse/inode.c3
2 files changed, 6 insertions, 4 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index a02418c89d4..2d3649e4259 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);
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 7d01c68852a..0cef5ea319f 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -584,6 +584,7 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
fc->minor = arg->minor;
fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
+ fc->max_write = min_t(unsigned, 4096, fc->max_write);
fc->conn_init = 1;
}
fuse_put_request(fc, req);
@@ -658,7 +659,7 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
fc->flags = d.flags;
fc->user_id = d.user_id;
fc->group_id = d.group_id;
- fc->max_read = d.max_read;
+ fc->max_read = min_t(unsigned, 4096, d.max_read);
/* Used by get_root_inode() */
sb->s_fs_info = fc;