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![Carlos Maiolino](/assets/img/avatar_default.png)
When a buffer has been failed during writeback, the inode items into it are kept flush locked, and are never resubmitted due the flush lock, so, if any buffer fails to be written, the items in AIL are never written to disk and never unlocked. This causes unmount operation to hang due these items flush locked in AIL, but this also causes the items in AIL to never be written back, even when the IO device comes back to normal. I've been testing this patch with a DM-thin device, creating a filesystem larger than the real device. When writing enough data to fill the DM-thin device, XFS receives ENOSPC errors from the device, and keep spinning on xfsaild (when 'retry forever' configuration is set). At this point, the filesystem can not be unmounted because of the flush locked items in AIL, but worse, the items in AIL are never retried at all (once xfs_inode_item_push() will skip the items that are flush locked), even if the underlying DM-thin device is expanded to the proper size. This patch fixes both cases, retrying any item that has been failed previously, using the infra-structure provided by the previous patch. Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
198 lines
5.5 KiB
C
198 lines
5.5 KiB
C
/*
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* Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_TRANS_PRIV_H__
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#define __XFS_TRANS_PRIV_H__
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struct xfs_log_item;
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struct xfs_log_item_desc;
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struct xfs_mount;
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struct xfs_trans;
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struct xfs_ail;
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struct xfs_log_vec;
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void xfs_trans_init(struct xfs_mount *);
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void xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
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void xfs_trans_del_item(struct xfs_log_item *);
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void xfs_trans_free_items(struct xfs_trans *tp, xfs_lsn_t commit_lsn,
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bool abort);
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void xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
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void xfs_trans_committed_bulk(struct xfs_ail *ailp, struct xfs_log_vec *lv,
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xfs_lsn_t commit_lsn, int aborted);
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/*
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* AIL traversal cursor.
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*
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* Rather than using a generation number for detecting changes in the ail, use
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* a cursor that is protected by the ail lock. The aild cursor exists in the
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* struct xfs_ail, but other traversals can declare it on the stack and link it
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* to the ail list.
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*
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* When an object is deleted from or moved int the AIL, the cursor list is
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* searched to see if the object is a designated cursor item. If it is, it is
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* deleted from the cursor so that the next time the cursor is used traversal
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* will return to the start.
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*
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* This means a traversal colliding with a removal will cause a restart of the
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* list scan, rather than any insertion or deletion anywhere in the list. The
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* low bit of the item pointer is set if the cursor has been invalidated so
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* that we can tell the difference between invalidation and reaching the end
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* of the list to trigger traversal restarts.
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*/
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struct xfs_ail_cursor {
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struct list_head list;
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struct xfs_log_item *item;
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};
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/*
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* Private AIL structures.
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*
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* Eventually we need to drive the locking in here as well.
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*/
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struct xfs_ail {
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struct xfs_mount *xa_mount;
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struct task_struct *xa_task;
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struct list_head xa_ail;
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xfs_lsn_t xa_target;
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xfs_lsn_t xa_target_prev;
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struct list_head xa_cursors;
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spinlock_t xa_lock;
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xfs_lsn_t xa_last_pushed_lsn;
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int xa_log_flush;
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struct list_head xa_buf_list;
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wait_queue_head_t xa_empty;
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};
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/*
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* From xfs_trans_ail.c
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*/
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void xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
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struct xfs_ail_cursor *cur,
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struct xfs_log_item **log_items, int nr_items,
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xfs_lsn_t lsn) __releases(ailp->xa_lock);
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/*
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* Return a pointer to the first item in the AIL. If the AIL is empty, then
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* return NULL.
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*/
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static inline struct xfs_log_item *
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xfs_ail_min(
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struct xfs_ail *ailp)
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{
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return list_first_entry_or_null(&ailp->xa_ail, struct xfs_log_item,
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li_ail);
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}
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static inline void
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xfs_trans_ail_update(
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struct xfs_ail *ailp,
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struct xfs_log_item *lip,
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xfs_lsn_t lsn) __releases(ailp->xa_lock)
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{
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xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
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}
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bool xfs_ail_delete_one(struct xfs_ail *ailp, struct xfs_log_item *lip);
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void xfs_trans_ail_delete(struct xfs_ail *ailp, struct xfs_log_item *lip,
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int shutdown_type) __releases(ailp->xa_lock);
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static inline void
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xfs_trans_ail_remove(
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struct xfs_log_item *lip,
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int shutdown_type)
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{
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struct xfs_ail *ailp = lip->li_ailp;
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spin_lock(&ailp->xa_lock);
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/* xfs_trans_ail_delete() drops the AIL lock */
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if (lip->li_flags & XFS_LI_IN_AIL)
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xfs_trans_ail_delete(ailp, lip, shutdown_type);
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else
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spin_unlock(&ailp->xa_lock);
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}
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void xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
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void xfs_ail_push_all(struct xfs_ail *);
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void xfs_ail_push_all_sync(struct xfs_ail *);
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struct xfs_log_item *xfs_ail_min(struct xfs_ail *ailp);
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xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp);
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struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
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struct xfs_ail_cursor *cur,
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xfs_lsn_t lsn);
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struct xfs_log_item * xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
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struct xfs_ail_cursor *cur,
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xfs_lsn_t lsn);
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struct xfs_log_item * xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
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struct xfs_ail_cursor *cur);
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void xfs_trans_ail_cursor_done(struct xfs_ail_cursor *cur);
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#if BITS_PER_LONG != 64
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static inline void
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xfs_trans_ail_copy_lsn(
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struct xfs_ail *ailp,
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xfs_lsn_t *dst,
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xfs_lsn_t *src)
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{
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ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
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spin_lock(&ailp->xa_lock);
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*dst = *src;
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spin_unlock(&ailp->xa_lock);
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}
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#else
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static inline void
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xfs_trans_ail_copy_lsn(
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struct xfs_ail *ailp,
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xfs_lsn_t *dst,
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xfs_lsn_t *src)
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{
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ASSERT(sizeof(xfs_lsn_t) == 8);
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*dst = *src;
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}
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#endif
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static inline void
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xfs_clear_li_failed(
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struct xfs_log_item *lip)
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{
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struct xfs_buf *bp = lip->li_buf;
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ASSERT(lip->li_flags & XFS_LI_IN_AIL);
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lockdep_assert_held(&lip->li_ailp->xa_lock);
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if (lip->li_flags & XFS_LI_FAILED) {
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lip->li_flags &= ~XFS_LI_FAILED;
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lip->li_buf = NULL;
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xfs_buf_rele(bp);
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}
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}
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static inline void
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xfs_set_li_failed(
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struct xfs_log_item *lip,
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struct xfs_buf *bp)
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{
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lockdep_assert_held(&lip->li_ailp->xa_lock);
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if (!(lip->li_flags & XFS_LI_FAILED)) {
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xfs_buf_hold(bp);
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lip->li_flags |= XFS_LI_FAILED;
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lip->li_buf = bp;
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}
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}
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#endif /* __XFS_TRANS_PRIV_H__ */
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