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>

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index bf535815592db1882a02a1a5d8382fa38e88854b..d0cdceb0b90bfa9b87922492048ee58c5d8ca473 100644 (file)
--- 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;
 }