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| author | Dave Chinner <dchinner@redhat.com> | 2011-03-29 18:08:50 +1100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-29 07:50:34 -0700 |
| commit | 0444d76ae64fffc7851797fc1b6ebdbb44ac504a (patch) | |
| tree | d0678f0f8c82f3c2b2c66a6b47242eef1b323142 | |
| parent | cb1817b37313b4b6c7f8f93c730553dd3cb6ac57 (diff) | |
| download | linux-0444d76ae64fffc7851797fc1b6ebdbb44ac504a.tar.gz linux-0444d76ae64fffc7851797fc1b6ebdbb44ac504a.tar.bz2 linux-0444d76ae64fffc7851797fc1b6ebdbb44ac504a.zip | |
fs: don't use igrab() while holding i_lock
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 <dchinner@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Cc: Ryan Mallon <ryan@bluewatersys.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/ceph/addr.c | 2 | ||||
| -rw-r--r-- | fs/ceph/snap.c | 4 | ||||
| -rw-r--r-- | fs/nfs/nfs4state.c | 3 |
3 files changed, 5 insertions, 4 deletions
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); diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index ab1bf5bb021f..a6804f704d9d 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -590,7 +590,8 @@ nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) state->owner = owner; atomic_inc(&owner->so_count); list_add(&state->inode_states, &nfsi->open_states); - state->inode = igrab(inode); + ihold(inode); + state->inode = inode; spin_unlock(&inode->i_lock); /* Note: The reclaim code dictates that we add stateless * and read-only stateids to the end of the list */ |