Merge branch 'master'

1 files changed, 20 insertions, 7 deletions

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 48146bdc6bdd..94b60dd03801 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -2732,16 +2732,29 @@ xfs_iunpin(
         ASSERT(atomic_read(&ip->i_pincount) > 0);
 
         if (atomic_dec_and_test(&ip->i_pincount)) {
-                vnode_t *vp = XFS_ITOV_NULL(ip);
+                /*
+                 * If the inode is currently being reclaimed, the
+                 * linux inode _and_ the xfs vnode may have been
+                 * freed so we cannot reference either of them safely.
+                 * Hence we should not try to do anything to them
+                 * if the xfs inode is currently in the reclaim
+                 * path.
+                 *
+                 * However, we still need to issue the unpin wakeup
+                 * call as the inode reclaim may be blocked waiting for
+                 * the inode to become unpinned.
+                 */
+                if (!(ip->i_flags & (XFS_IRECLAIM|XFS_IRECLAIMABLE))) {
+                        vnode_t *vp = XFS_ITOV_NULL(ip);
 
-                /* make sync come back and flush this inode */
-                if (vp) {
-                        struct inode    *inode = vn_to_inode(vp);
+                        /* make sync come back and flush this inode */
+                        if (vp) {
+                                struct inode    *inode = vn_to_inode(vp);
 
-                        if (!(inode->i_state & I_NEW))
-                                mark_inode_dirty_sync(inode);
+                                if (!(inode->i_state & I_NEW))
+                                        mark_inode_dirty_sync(inode);
+                        }
                 }
-
                 wake_up(&ip->i_ipin_wait);
         }
 }