linux-kernel - [PATCH 4/4] fuse: writepages: protect secondary requests from fuse file release

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Message-ID: <20131002173848.31188.77211.stgit@dhcp-10-30-17-2.sw.ru>
Date:	Wed, 02 Oct 2013 21:38:54 +0400
From:	Maxim Patlasov <MPatlasov@...allels.com>
To:	miklos@...redi.hu
Cc:	fuse-devel@...ts.sourceforge.net, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] fuse: writepages: protect secondary requests from fuse
 file release

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@...allels.com>
---
 fs/fuse/file.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 5d323bd..266a792 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1521,6 +1521,7 @@ static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req)
 			continue;
 		}
 
+		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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