From 0444d76ae64fffc7851797fc1b6ebdbb44ac504a Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Tue, 29 Mar 2011 18:08:50 +1100 Subject: fs: don't use igrab() while holding i_lock MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fix the incorrect use of igrab() inside the i_lock in NFS and Ceph‥ If we are already holding the i_lock, we have a reference to the inode so we can safely use ihold() to gain an extra reference. This avoids hangs due to lock recursion on the i_lock now that the inode_lock is gone and igrab() uses the i_lock itself. Signed-off-by: Dave Chinner Cc: Al Viro Cc: linux-fsdevel@vger.kernel.org Cc: Ryan Mallon Signed-off-by: Linus Torvalds --- fs/ceph/addr.c | 2 +- fs/ceph/snap.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) (limited to 'fs/ceph') diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 561438b6a50c..37368ba2e67c 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -92,7 +92,7 @@ static int ceph_set_page_dirty(struct page *page) ci->i_head_snapc = ceph_get_snap_context(snapc); ++ci->i_wrbuffer_ref_head; if (ci->i_wrbuffer_ref == 0) - igrab(inode); + ihold(inode); ++ci->i_wrbuffer_ref; dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " "snapc %p seq %lld (%d snaps)\n", diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c index f40b9139e437..0aee66b92af3 100644 --- a/fs/ceph/snap.c +++ b/fs/ceph/snap.c @@ -463,8 +463,8 @@ void ceph_queue_cap_snap(struct ceph_inode_info *ci) dout("queue_cap_snap %p cap_snap %p queuing under %p\n", inode, capsnap, snapc); - igrab(inode); - + ihold(inode); + atomic_set(&capsnap->nref, 1); capsnap->ci = ci; INIT_LIST_HEAD(&capsnap->ci_item); -- cgit v1.2.3