[PATCH 4.7 097/186] pNFS: Fix LAYOUTGET handling of NFS4ERR_BAD_STATEID and NFS4ERR_EXPIRED

[Greg Kroah-Hartman]

4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>

commit f7db0b283868411dc6bc8a223fd032b211d2d91f upstream.

We want to recover the open stateid if there is no layout stateid
and/or the stateid argument matches an open stateid.
Otherwise throw out the existing layout and recover from scratch, as
the layout stateid is bad.

Fixes: 183d9e7b112aa ("pnfs: rework LAYOUTGET retry handling")
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/nfs/nfs4proc.c |   32 ++++++++++++++------------------
 1 file changed, 14 insertions(+), 18 deletions(-)

--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7872,6 +7872,7 @@ nfs4_layoutget_handle_exception(struct r
 	struct pnfs_layout_hdr *lo;
 	int nfs4err = task->tk_status;
 	int err, status = 0;
+	LIST_HEAD(head);
 
 	dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
 
@@ -7916,30 +7917,25 @@ nfs4_layoutget_handle_exception(struct r
 	case -NFS4ERR_BAD_STATEID:
 		exception->timeout = 0;
 		spin_lock(&inode->i_lock);
-		if (nfs4_stateid_match(&lgp->args.stateid,
+		lo = NFS_I(inode)->layout;
+		/* If the open stateid was bad, then recover it. */
+		if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
+		    nfs4_stateid_match_other(&lgp->args.stateid,
 					&lgp->args.ctx->state->stateid)) {
 			spin_unlock(&inode->i_lock);
-			/* If the open stateid was bad, then recover it. */
 			exception->state = lgp->args.ctx->state;
 			break;
 		}
-		lo = NFS_I(inode)->layout;
-		if (lo && !test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) &&
-		    nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
-			LIST_HEAD(head);
 
-			/*
-			 * Mark the bad layout state as invalid, then retry
-			 * with the current stateid.
-			 */
-			set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
-			pnfs_mark_matching_lsegs_invalid(lo, &head, NULL, 0);
-			spin_unlock(&inode->i_lock);
-			pnfs_free_lseg_list(&head);
-			status = -EAGAIN;
-			goto out;
-		} else
-			spin_unlock(&inode->i_lock);
+		/*
+		 * Mark the bad layout state as invalid, then retry
+		 */
+		set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
+		pnfs_mark_matching_lsegs_invalid(lo, &head, NULL, 0);
+		spin_unlock(&inode->i_lock);
+		pnfs_free_lseg_list(&head);
+		status = -EAGAIN;
+		goto out;
 	}
 
 	err = nfs4_handle_exception(server, nfs4err, exception);