Commit 76e8f138 authored Jun 11, 2012 by Brian Foster Committed by Ben Myers Jun 21, 2012

xfs: check for stale inode before acquiring iflock on push



An inode in the AIL can be flush locked and marked stale if
a cluster free transaction occurs at the right time. The
inode item is then marked as flushing, which causes xfsaild
to spin and leaves the filesystem stalled. This is
reproduced by running xfstests 273 in a loop for an
extended period of time.

Check for stale inodes before the flush lock. This marks
the inode as pinned, leads to a log flush and allows the
filesystem to proceed.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

parent 51c84223

fs/xfs/xfs_inode_item.c

+8 −9

Original line number	Diff line number	Diff line
		@@ -504,6 +504,14 @@ xfs_inode_item_push(
		goto out_unlock;
		}

		/*
		* Stale inode items should force out the iclog.
		*/
		if (ip->i_flags & XFS_ISTALE) {
		rval = XFS_ITEM_PINNED;
		goto out_unlock;
		}

		/*
		* Someone else is already flushing the inode. Nothing we can do
		* here but wait for the flush to finish and remove the item from
		@@ -514,15 +522,6 @@ xfs_inode_item_push(
		goto out_unlock;
		}

		/*
		* Stale inode items should force out the iclog.
		*/
		if (ip->i_flags & XFS_ISTALE) {
		xfs_ifunlock(ip);
		xfs_iunlock(ip, XFS_ILOCK_SHARED);
		return XFS_ITEM_PINNED;
		}

		ASSERT(iip->ili_fields != 0 \|\| XFS_FORCED_SHUTDOWN(ip->i_mount));
		ASSERT(iip->ili_logged == 0 \|\| XFS_FORCED_SHUTDOWN(ip->i_mount));