[PATCH 5/5] fuse: writepages: protect secondary requests from fusefile release

[Maxim Patlasov]

All async fuse requests must be supplied with extra reference to a fuse file.
This is necessary to ensure that the fuse file is not released until all
in-flight requests are completed. Fuse secondary writeback requests must
obey this rule as well.

Signed-off-by: Maxim Patlasov <MPatlasov@xxxxxxxxxxxxx>
---
 fs/fuse/file.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 06d6099..23bc608 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1548,6 +1548,7 @@ static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req)
 		struct fuse_req *next = req->misc.write.next;
 		req->misc.write.next = next->misc.write.next;
 		next->misc.write.next = NULL;
+		next->ff = fuse_file_get(req->ff);
 		list_add(&next->writepages_entry, &fi->writepages);
 		list_add_tail(&next->list, &fi->queued_writes);
 		fuse_flush_writepages(inode);

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