From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:43370 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751790AbdK1ObJ (ORCPT ); Tue, 28 Nov 2017 09:31:09 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 953D380B29 for ; Tue, 28 Nov 2017 14:31:09 +0000 (UTC) Received: from odin.usersys.redhat.com (ovpn-204-122.brq.redhat.com [10.40.204.122]) by smtp.corp.redhat.com (Postfix) with ESMTP id EBABC5C549 for ; Tue, 28 Nov 2017 14:31:08 +0000 (UTC) From: Carlos Maiolino Subject: [PATCH V2] xfs: Properly retry failed dquot items in case of error during buffer writeback Date: Tue, 28 Nov 2017 15:31:01 +0100 Message-Id: <20171128143101.18861-1-cmaiolino@redhat.com> Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: linux-xfs@vger.kernel.org Once the inode item writeback errors is already fixed, it's time to fix the same problem in dquot code. Although there were no reports of users hitting this bug in dquot code (at least none I've seen), the bug is there and I was already planning to fix it when the correct approach to fix the inodes part was decided. This patch aims to fix the same problem in dquot code, regarding failed buffers being unable to be resubmitted once they are flush locked. Tested with the recently test-case sent to fstests list by Hou Tao. Signed-off-by: Carlos Maiolino --- V2: - in xfs_dquot.c ..Add a couple of parentheses around lip->li_flags & XFS_LI_FAILED - in xfs_dquot_item.c: ..Add missing blank line between variable definiton and code ..Initialize dqp pointer out of variable definition to shut up gcc's 'unused variable' warning fs/xfs/xfs_dquot.c | 11 ++++++++--- fs/xfs/xfs_dquot_item.c | 40 ++++++++++++++++++++++++++++++++++++++-- 2 files changed, 46 insertions(+), 5 deletions(-) diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c index d57c2db64e59..b2bafa284253 100644 --- a/fs/xfs/xfs_dquot.c +++ b/fs/xfs/xfs_dquot.c @@ -970,14 +970,19 @@ xfs_qm_dqflush_done( * holding the lock before removing the dquot from the AIL. */ if ((lip->li_flags & XFS_LI_IN_AIL) && - lip->li_lsn == qip->qli_flush_lsn) { + ((lip->li_lsn == qip->qli_flush_lsn) || + (lip->li_flags & XFS_LI_FAILED))) { /* xfs_trans_ail_delete() drops the AIL lock. */ spin_lock(&ailp->xa_lock); - if (lip->li_lsn == qip->qli_flush_lsn) + if (lip->li_lsn == qip->qli_flush_lsn) { xfs_trans_ail_delete(ailp, lip, SHUTDOWN_CORRUPT_INCORE); - else + } else if (lip->li_flags & XFS_LI_FAILED) { + xfs_clear_li_failed(lip); spin_unlock(&ailp->xa_lock); + } else { + spin_unlock(&ailp->xa_lock); + } } /* diff --git a/fs/xfs/xfs_dquot_item.c b/fs/xfs/xfs_dquot_item.c index 2c7a1629e064..664dea105e76 100644 --- a/fs/xfs/xfs_dquot_item.c +++ b/fs/xfs/xfs_dquot_item.c @@ -137,6 +137,26 @@ xfs_qm_dqunpin_wait( wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0)); } +/* + * Callback used to mark a buffer with XFS_LI_FAILED when items in the buffer + * have been failed during writeback + * + * this informs the AIL that the dquot is already flush locked on the next push, + * and acquires a hold on the buffer to ensure that it isn't reclaimed before + * dirty data makes it to disk. + */ +STATIC void +xfs_dquot_item_error( + struct xfs_log_item *lip, + struct xfs_buf *bp) +{ + struct xfs_dquot *dqp; + + dqp = DQUOT_ITEM(lip)->qli_dquot; + ASSERT(!completion_done(&dqp->q_flush)); + xfs_set_li_failed(lip, bp); +} + STATIC uint xfs_qm_dquot_logitem_push( struct xfs_log_item *lip, @@ -144,13 +164,28 @@ xfs_qm_dquot_logitem_push( __acquires(&lip->li_ailp->xa_lock) { struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; - struct xfs_buf *bp = NULL; + struct xfs_buf *bp = lip->li_buf; uint rval = XFS_ITEM_SUCCESS; int error; if (atomic_read(&dqp->q_pincount) > 0) return XFS_ITEM_PINNED; + /* + * The buffer containing this item failed to be written back + * previously. Resubmit the buffer for IO + */ + if (lip->li_flags & XFS_LI_FAILED) { + if (!xfs_buf_trylock(bp)) + return XFS_ITEM_LOCKED; + + if (!xfs_buf_resubmit_failed_buffers(bp, lip, buffer_list)) + rval = XFS_ITEM_FLUSHING; + + xfs_buf_unlock(bp); + return rval; + } + if (!xfs_dqlock_nowait(dqp)) return XFS_ITEM_LOCKED; @@ -242,7 +277,8 @@ static const struct xfs_item_ops xfs_dquot_item_ops = { .iop_unlock = xfs_qm_dquot_logitem_unlock, .iop_committed = xfs_qm_dquot_logitem_committed, .iop_push = xfs_qm_dquot_logitem_push, - .iop_committing = xfs_qm_dquot_logitem_committing + .iop_committing = xfs_qm_dquot_logitem_committing, + .iop_error = xfs_dquot_item_error }; /* -- 2.14.3