ceph: writepage grabs and releases inode

Fixes a deadlock that is triggered due to kswapd,
while the page was locked and the iput couldn't tear
down the address space.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index bf535815592d..d0cdceb0b90b 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -448,8 +448,13 @@ out:
 
 static int ceph_writepage(struct page *page, struct writeback_control *wbc)
 {
-        int err = writepage_nounlock(page, wbc);
+        int err;
+        struct inode *inode = page->mapping->host;
+        BUG_ON(!inode);
+        igrab(inode);
+        err = writepage_nounlock(page, wbc);
         unlock_page(page);
+        iput(inode);
         return err;
 }