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authorMaxim Patlasov <MPatlasov@parallels.com>2013-10-02 15:01:07 +0400
committerMiklos Szeredi <mszeredi@suse.cz>2013-11-05 10:11:26 +0100
commitf6011081f5e290756bd90fe96f1e86d3eac76f77 (patch)
tree12c724c1dcb89f2618ff39457941593f10749a96 /fs/fuse
parentcb2ffb26e67ef89c44f46e971440cda2f83ae236 (diff)
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fuse: writepages: roll back changes if request not found
fuse_writepage_in_flight() returns false if it fails to find request with given index in fi->writepages. Then the caller proceeds with populating data->orig_pages[] and incrementing req->num_pages. Hence, fuse_writepage_in_flight() must revert changes it made in request before returning false. Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/file.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 135360e2b9e5..077b03844998 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1649,7 +1649,6 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
spin_lock(&fc->lock);
list_del(&new_req->writepages_entry);
- new_req->num_pages = 1;
list_for_each_entry(old_req, &fi->writepages, writepages_entry) {
BUG_ON(old_req->inode != new_req->inode);
curr_index = old_req->misc.write.in.offset >> PAGE_CACHE_SHIFT;
@@ -1659,9 +1658,12 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
break;
}
}
- if (!found)
+ if (!found) {
+ list_add(&new_req->writepages_entry, &fi->writepages);
goto out_unlock;
+ }
+ new_req->num_pages = 1;
for (tmp = old_req; tmp != NULL; tmp = tmp->misc.write.next) {
BUG_ON(tmp->inode != new_req->inode);
curr_index = tmp->misc.write.in.offset >> PAGE_CACHE_SHIFT;