[PATCH 1/4] fuse: writepages: roll back changes if request not found

[Maxim Patlasov]

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@xxxxxxxxxxxxx>
---
 fs/fuse/file.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 135360e..575e44f 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1659,8 +1659,11 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
 			break;
 		}
 	}
-	if (!found)
+	if (!found) {
+		new_req->num_pages = 0;
+		list_add(&new_req->writepages_entry, &fi->writepages);
 		goto out_unlock;
+	}
 
 	for (tmp = old_req; tmp != NULL; tmp = tmp->misc.write.next) {
 		BUG_ON(tmp->inode != new_req->inode);

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