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18f1df4e00
Hendik has reported suspend failures due to xfsaild blocking the freezer
to settle down.
Jan 17 19:59:56 linux-6380 kernel: PM: Syncing filesystems ... done.
Jan 17 19:59:56 linux-6380 kernel: PM: Preparing system for sleep (mem)
Jan 17 19:59:56 linux-6380 kernel: Freezing user space processes ... (elapsed 0.001 seconds) done.
Jan 17 19:59:56 linux-6380 kernel: Freezing remaining freezable tasks ...
Jan 17 19:59:56 linux-6380 kernel: Freezing of tasks failed after 20.002 seconds (1 tasks refusing to freeze, wq_busy=0):
Jan 17 19:59:56 linux-6380 kernel: xfsaild/dm-5 S 00000000 0 1293 2 0x00000080
Jan 17 19:59:56 linux-6380 kernel: f0ef5f00 00000046 00000200 00000000 ffff9022 c02d3800 00000000 00000032
Jan 17 19:59:56 linux-6380 kernel: ee0b2400 00000032 f71e0d00 f36fabc0 f0ef2d00 f0ef6000 f0ef2d00 f12f90c0
Jan 17 19:59:56 linux-6380 kernel: f0ef5f0c c0844e44 00000000 f0ef5f6c f811e0be 00000000 00000000 f0ef2d00
Jan 17 19:59:56 linux-6380 kernel: Call Trace:
Jan 17 19:59:56 linux-6380 kernel: [<c0844e44>] schedule+0x34/0x90
Jan 17 19:59:56 linux-6380 kernel: [<f811e0be>] xfsaild+0x5de/0x600 [xfs]
Jan 17 19:59:56 linux-6380 kernel: [<c0286cbb>] kthread+0x9b/0xb0
Jan 17 19:59:56 linux-6380 kernel: [<c0848a79>] ret_from_kernel_thread+0x21/0x38
The issue has been there for quite some time but it has been made
visible by only by 24ba16bb3d
("xfs: clear PF_NOFREEZE for xfsaild
kthread") because the suspend started seeing xfsaild.
The above commit has missed that the !xfs_ail_min branch might call
schedule with TASK_INTERRUPTIBLE without calling try_to_freeze so the pm
suspend would wake up the kernel thread over and over again without any
progress. What we want here is to use freezable_schedule instead to hide
the thread from the suspend.
While we are here also change schedule_timeout to freezable variant to
prevent from spurious wakeups by suspend.
[dchinner: re-add set_freezeable call so the freezer will account properly
for this kthread. ]
Reported-by: Hendrik Woltersdorf <hendrikw@arcor.de>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
796 lines
20 KiB
C
796 lines
20 KiB
C
/*
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* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
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* Copyright (c) 2008 Dave Chinner
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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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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_trans.h"
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#include "xfs_trans_priv.h"
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#include "xfs_trace.h"
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#include "xfs_error.h"
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#include "xfs_log.h"
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#ifdef DEBUG
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/*
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* Check that the list is sorted as it should be.
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*/
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STATIC void
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xfs_ail_check(
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struct xfs_ail *ailp,
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xfs_log_item_t *lip)
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{
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xfs_log_item_t *prev_lip;
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if (list_empty(&ailp->xa_ail))
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return;
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/*
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* Check the next and previous entries are valid.
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*/
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ASSERT((lip->li_flags & XFS_LI_IN_AIL) != 0);
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prev_lip = list_entry(lip->li_ail.prev, xfs_log_item_t, li_ail);
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if (&prev_lip->li_ail != &ailp->xa_ail)
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ASSERT(XFS_LSN_CMP(prev_lip->li_lsn, lip->li_lsn) <= 0);
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prev_lip = list_entry(lip->li_ail.next, xfs_log_item_t, li_ail);
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if (&prev_lip->li_ail != &ailp->xa_ail)
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ASSERT(XFS_LSN_CMP(prev_lip->li_lsn, lip->li_lsn) >= 0);
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}
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#else /* !DEBUG */
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#define xfs_ail_check(a,l)
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#endif /* DEBUG */
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/*
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* Return a pointer to the last 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 xfs_log_item_t *
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xfs_ail_max(
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struct xfs_ail *ailp)
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{
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if (list_empty(&ailp->xa_ail))
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return NULL;
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return list_entry(ailp->xa_ail.prev, xfs_log_item_t, li_ail);
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}
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/*
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* Return a pointer to the item which follows the given item in the AIL. If
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* the given item is the last item in the list, then return NULL.
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*/
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static xfs_log_item_t *
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xfs_ail_next(
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struct xfs_ail *ailp,
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xfs_log_item_t *lip)
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{
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if (lip->li_ail.next == &ailp->xa_ail)
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return NULL;
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return list_first_entry(&lip->li_ail, xfs_log_item_t, li_ail);
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}
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/*
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* This is called by the log manager code to determine the LSN of the tail of
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* the log. This is exactly the LSN of the first item in the AIL. If the AIL
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* is empty, then this function returns 0.
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*
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* We need the AIL lock in order to get a coherent read of the lsn of the last
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* item in the AIL.
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*/
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xfs_lsn_t
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xfs_ail_min_lsn(
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struct xfs_ail *ailp)
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{
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xfs_lsn_t lsn = 0;
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xfs_log_item_t *lip;
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spin_lock(&ailp->xa_lock);
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lip = xfs_ail_min(ailp);
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if (lip)
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lsn = lip->li_lsn;
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spin_unlock(&ailp->xa_lock);
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return lsn;
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}
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/*
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* Return the maximum lsn held in the AIL, or zero if the AIL is empty.
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*/
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static xfs_lsn_t
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xfs_ail_max_lsn(
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struct xfs_ail *ailp)
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{
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xfs_lsn_t lsn = 0;
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xfs_log_item_t *lip;
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spin_lock(&ailp->xa_lock);
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lip = xfs_ail_max(ailp);
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if (lip)
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lsn = lip->li_lsn;
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spin_unlock(&ailp->xa_lock);
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return lsn;
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}
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/*
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* The cursor keeps track of where our current traversal is up to by tracking
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* the next item in the list for us. However, for this to be safe, removing an
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* object from the AIL needs to invalidate any cursor that points to it. hence
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* the traversal cursor needs to be linked to the struct xfs_ail so that
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* deletion can search all the active cursors for invalidation.
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*/
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STATIC void
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xfs_trans_ail_cursor_init(
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struct xfs_ail *ailp,
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struct xfs_ail_cursor *cur)
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{
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cur->item = NULL;
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list_add_tail(&cur->list, &ailp->xa_cursors);
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}
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/*
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* Get the next item in the traversal and advance the cursor. If the cursor
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* was invalidated (indicated by a lip of 1), restart the traversal.
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*/
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struct xfs_log_item *
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xfs_trans_ail_cursor_next(
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struct xfs_ail *ailp,
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struct xfs_ail_cursor *cur)
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{
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struct xfs_log_item *lip = cur->item;
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if ((uintptr_t)lip & 1)
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lip = xfs_ail_min(ailp);
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if (lip)
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cur->item = xfs_ail_next(ailp, lip);
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return lip;
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}
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/*
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* When the traversal is complete, we need to remove the cursor from the list
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* of traversing cursors.
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*/
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void
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xfs_trans_ail_cursor_done(
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struct xfs_ail_cursor *cur)
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{
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cur->item = NULL;
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list_del_init(&cur->list);
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}
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/*
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* Invalidate any cursor that is pointing to this item. This is called when an
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* item is removed from the AIL. Any cursor pointing to this object is now
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* invalid and the traversal needs to be terminated so it doesn't reference a
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* freed object. We set the low bit of the cursor item pointer so we can
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* distinguish between an invalidation and the end of the list when getting the
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* next item from the cursor.
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*/
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STATIC void
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xfs_trans_ail_cursor_clear(
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struct xfs_ail *ailp,
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struct xfs_log_item *lip)
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{
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struct xfs_ail_cursor *cur;
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list_for_each_entry(cur, &ailp->xa_cursors, list) {
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if (cur->item == lip)
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cur->item = (struct xfs_log_item *)
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((uintptr_t)cur->item | 1);
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}
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}
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/*
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* Find the first item in the AIL with the given @lsn by searching in ascending
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* LSN order and initialise the cursor to point to the next item for a
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* ascending traversal. Pass a @lsn of zero to initialise the cursor to the
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* first item in the AIL. Returns NULL if the list is empty.
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*/
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xfs_log_item_t *
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xfs_trans_ail_cursor_first(
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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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{
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xfs_log_item_t *lip;
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xfs_trans_ail_cursor_init(ailp, cur);
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if (lsn == 0) {
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lip = xfs_ail_min(ailp);
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goto out;
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}
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list_for_each_entry(lip, &ailp->xa_ail, li_ail) {
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if (XFS_LSN_CMP(lip->li_lsn, lsn) >= 0)
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goto out;
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}
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return NULL;
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out:
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if (lip)
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cur->item = xfs_ail_next(ailp, lip);
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return lip;
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}
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static struct xfs_log_item *
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__xfs_trans_ail_cursor_last(
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struct xfs_ail *ailp,
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xfs_lsn_t lsn)
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{
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xfs_log_item_t *lip;
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list_for_each_entry_reverse(lip, &ailp->xa_ail, li_ail) {
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if (XFS_LSN_CMP(lip->li_lsn, lsn) <= 0)
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return lip;
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}
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return NULL;
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}
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/*
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* Find the last item in the AIL with the given @lsn by searching in descending
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* LSN order and initialise the cursor to point to that item. If there is no
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* item with the value of @lsn, then it sets the cursor to the last item with an
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* LSN lower than @lsn. Returns NULL if the list is empty.
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*/
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struct xfs_log_item *
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xfs_trans_ail_cursor_last(
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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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{
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xfs_trans_ail_cursor_init(ailp, cur);
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cur->item = __xfs_trans_ail_cursor_last(ailp, lsn);
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return cur->item;
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}
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/*
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* Splice the log item list into the AIL at the given LSN. We splice to the
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* tail of the given LSN to maintain insert order for push traversals. The
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* cursor is optional, allowing repeated updates to the same LSN to avoid
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* repeated traversals. This should not be called with an empty list.
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*/
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static void
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xfs_ail_splice(
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struct xfs_ail *ailp,
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struct xfs_ail_cursor *cur,
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struct list_head *list,
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xfs_lsn_t lsn)
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{
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struct xfs_log_item *lip;
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ASSERT(!list_empty(list));
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/*
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* Use the cursor to determine the insertion point if one is
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* provided. If not, or if the one we got is not valid,
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* find the place in the AIL where the items belong.
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*/
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lip = cur ? cur->item : NULL;
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if (!lip || (uintptr_t)lip & 1)
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lip = __xfs_trans_ail_cursor_last(ailp, lsn);
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/*
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* If a cursor is provided, we know we're processing the AIL
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* in lsn order, and future items to be spliced in will
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* follow the last one being inserted now. Update the
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* cursor to point to that last item, now while we have a
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* reliable pointer to it.
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*/
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if (cur)
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cur->item = list_entry(list->prev, struct xfs_log_item, li_ail);
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/*
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* Finally perform the splice. Unless the AIL was empty,
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* lip points to the item in the AIL _after_ which the new
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* items should go. If lip is null the AIL was empty, so
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* the new items go at the head of the AIL.
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*/
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if (lip)
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list_splice(list, &lip->li_ail);
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else
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list_splice(list, &ailp->xa_ail);
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}
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/*
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* Delete the given item from the AIL. Return a pointer to the item.
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*/
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static void
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xfs_ail_delete(
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struct xfs_ail *ailp,
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xfs_log_item_t *lip)
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{
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xfs_ail_check(ailp, lip);
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list_del(&lip->li_ail);
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xfs_trans_ail_cursor_clear(ailp, lip);
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}
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static long
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xfsaild_push(
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struct xfs_ail *ailp)
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{
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xfs_mount_t *mp = ailp->xa_mount;
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struct xfs_ail_cursor cur;
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xfs_log_item_t *lip;
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xfs_lsn_t lsn;
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xfs_lsn_t target;
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long tout;
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int stuck = 0;
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int flushing = 0;
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int count = 0;
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/*
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* If we encountered pinned items or did not finish writing out all
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* buffers the last time we ran, force the log first and wait for it
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* before pushing again.
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*/
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if (ailp->xa_log_flush && ailp->xa_last_pushed_lsn == 0 &&
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(!list_empty_careful(&ailp->xa_buf_list) ||
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xfs_ail_min_lsn(ailp))) {
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ailp->xa_log_flush = 0;
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XFS_STATS_INC(mp, xs_push_ail_flush);
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xfs_log_force(mp, XFS_LOG_SYNC);
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}
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spin_lock(&ailp->xa_lock);
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/* barrier matches the xa_target update in xfs_ail_push() */
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smp_rmb();
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target = ailp->xa_target;
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ailp->xa_target_prev = target;
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lip = xfs_trans_ail_cursor_first(ailp, &cur, ailp->xa_last_pushed_lsn);
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if (!lip) {
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/*
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* If the AIL is empty or our push has reached the end we are
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* done now.
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*/
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xfs_trans_ail_cursor_done(&cur);
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spin_unlock(&ailp->xa_lock);
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goto out_done;
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}
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XFS_STATS_INC(mp, xs_push_ail);
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lsn = lip->li_lsn;
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while ((XFS_LSN_CMP(lip->li_lsn, target) <= 0)) {
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int lock_result;
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/*
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* Note that iop_push may unlock and reacquire the AIL lock. We
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* rely on the AIL cursor implementation to be able to deal with
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* the dropped lock.
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*/
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lock_result = lip->li_ops->iop_push(lip, &ailp->xa_buf_list);
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switch (lock_result) {
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case XFS_ITEM_SUCCESS:
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XFS_STATS_INC(mp, xs_push_ail_success);
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trace_xfs_ail_push(lip);
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ailp->xa_last_pushed_lsn = lsn;
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break;
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case XFS_ITEM_FLUSHING:
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/*
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* The item or its backing buffer is already beeing
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* flushed. The typical reason for that is that an
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* inode buffer is locked because we already pushed the
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* updates to it as part of inode clustering.
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*
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* We do not want to to stop flushing just because lots
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* of items are already beeing flushed, but we need to
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* re-try the flushing relatively soon if most of the
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* AIL is beeing flushed.
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*/
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XFS_STATS_INC(mp, xs_push_ail_flushing);
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trace_xfs_ail_flushing(lip);
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flushing++;
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ailp->xa_last_pushed_lsn = lsn;
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break;
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case XFS_ITEM_PINNED:
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XFS_STATS_INC(mp, xs_push_ail_pinned);
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trace_xfs_ail_pinned(lip);
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stuck++;
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ailp->xa_log_flush++;
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break;
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case XFS_ITEM_LOCKED:
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XFS_STATS_INC(mp, xs_push_ail_locked);
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trace_xfs_ail_locked(lip);
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stuck++;
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break;
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default:
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ASSERT(0);
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break;
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}
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count++;
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/*
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* Are there too many items we can't do anything with?
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*
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* If we we are skipping too many items because we can't flush
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* them or they are already being flushed, we back off and
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* given them time to complete whatever operation is being
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* done. i.e. remove pressure from the AIL while we can't make
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* progress so traversals don't slow down further inserts and
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* removals to/from the AIL.
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*
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* The value of 100 is an arbitrary magic number based on
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* observation.
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*/
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if (stuck > 100)
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break;
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lip = xfs_trans_ail_cursor_next(ailp, &cur);
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if (lip == NULL)
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break;
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lsn = lip->li_lsn;
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}
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xfs_trans_ail_cursor_done(&cur);
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spin_unlock(&ailp->xa_lock);
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if (xfs_buf_delwri_submit_nowait(&ailp->xa_buf_list))
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ailp->xa_log_flush++;
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if (!count || XFS_LSN_CMP(lsn, target) >= 0) {
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out_done:
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/*
|
|
* We reached the target or the AIL is empty, so wait a bit
|
|
* longer for I/O to complete and remove pushed items from the
|
|
* AIL before we start the next scan from the start of the AIL.
|
|
*/
|
|
tout = 50;
|
|
ailp->xa_last_pushed_lsn = 0;
|
|
} else if (((stuck + flushing) * 100) / count > 90) {
|
|
/*
|
|
* Either there is a lot of contention on the AIL or we are
|
|
* stuck due to operations in progress. "Stuck" in this case
|
|
* is defined as >90% of the items we tried to push were stuck.
|
|
*
|
|
* Backoff a bit more to allow some I/O to complete before
|
|
* restarting from the start of the AIL. This prevents us from
|
|
* spinning on the same items, and if they are pinned will all
|
|
* the restart to issue a log force to unpin the stuck items.
|
|
*/
|
|
tout = 20;
|
|
ailp->xa_last_pushed_lsn = 0;
|
|
} else {
|
|
/*
|
|
* Assume we have more work to do in a short while.
|
|
*/
|
|
tout = 10;
|
|
}
|
|
|
|
return tout;
|
|
}
|
|
|
|
static int
|
|
xfsaild(
|
|
void *data)
|
|
{
|
|
struct xfs_ail *ailp = data;
|
|
long tout = 0; /* milliseconds */
|
|
|
|
current->flags |= PF_MEMALLOC;
|
|
set_freezable();
|
|
|
|
while (!kthread_should_stop()) {
|
|
if (tout && tout <= 20)
|
|
__set_current_state(TASK_KILLABLE);
|
|
else
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
spin_lock(&ailp->xa_lock);
|
|
|
|
/*
|
|
* Idle if the AIL is empty and we are not racing with a target
|
|
* update. We check the AIL after we set the task to a sleep
|
|
* state to guarantee that we either catch an xa_target update
|
|
* or that a wake_up resets the state to TASK_RUNNING.
|
|
* Otherwise, we run the risk of sleeping indefinitely.
|
|
*
|
|
* The barrier matches the xa_target update in xfs_ail_push().
|
|
*/
|
|
smp_rmb();
|
|
if (!xfs_ail_min(ailp) &&
|
|
ailp->xa_target == ailp->xa_target_prev) {
|
|
spin_unlock(&ailp->xa_lock);
|
|
freezable_schedule();
|
|
tout = 0;
|
|
continue;
|
|
}
|
|
spin_unlock(&ailp->xa_lock);
|
|
|
|
if (tout)
|
|
freezable_schedule_timeout(msecs_to_jiffies(tout));
|
|
|
|
__set_current_state(TASK_RUNNING);
|
|
|
|
try_to_freeze();
|
|
|
|
tout = xfsaild_push(ailp);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This routine is called to move the tail of the AIL forward. It does this by
|
|
* trying to flush items in the AIL whose lsns are below the given
|
|
* threshold_lsn.
|
|
*
|
|
* The push is run asynchronously in a workqueue, which means the caller needs
|
|
* to handle waiting on the async flush for space to become available.
|
|
* We don't want to interrupt any push that is in progress, hence we only queue
|
|
* work if we set the pushing bit approriately.
|
|
*
|
|
* We do this unlocked - we only need to know whether there is anything in the
|
|
* AIL at the time we are called. We don't need to access the contents of
|
|
* any of the objects, so the lock is not needed.
|
|
*/
|
|
void
|
|
xfs_ail_push(
|
|
struct xfs_ail *ailp,
|
|
xfs_lsn_t threshold_lsn)
|
|
{
|
|
xfs_log_item_t *lip;
|
|
|
|
lip = xfs_ail_min(ailp);
|
|
if (!lip || XFS_FORCED_SHUTDOWN(ailp->xa_mount) ||
|
|
XFS_LSN_CMP(threshold_lsn, ailp->xa_target) <= 0)
|
|
return;
|
|
|
|
/*
|
|
* Ensure that the new target is noticed in push code before it clears
|
|
* the XFS_AIL_PUSHING_BIT.
|
|
*/
|
|
smp_wmb();
|
|
xfs_trans_ail_copy_lsn(ailp, &ailp->xa_target, &threshold_lsn);
|
|
smp_wmb();
|
|
|
|
wake_up_process(ailp->xa_task);
|
|
}
|
|
|
|
/*
|
|
* Push out all items in the AIL immediately
|
|
*/
|
|
void
|
|
xfs_ail_push_all(
|
|
struct xfs_ail *ailp)
|
|
{
|
|
xfs_lsn_t threshold_lsn = xfs_ail_max_lsn(ailp);
|
|
|
|
if (threshold_lsn)
|
|
xfs_ail_push(ailp, threshold_lsn);
|
|
}
|
|
|
|
/*
|
|
* Push out all items in the AIL immediately and wait until the AIL is empty.
|
|
*/
|
|
void
|
|
xfs_ail_push_all_sync(
|
|
struct xfs_ail *ailp)
|
|
{
|
|
struct xfs_log_item *lip;
|
|
DEFINE_WAIT(wait);
|
|
|
|
spin_lock(&ailp->xa_lock);
|
|
while ((lip = xfs_ail_max(ailp)) != NULL) {
|
|
prepare_to_wait(&ailp->xa_empty, &wait, TASK_UNINTERRUPTIBLE);
|
|
ailp->xa_target = lip->li_lsn;
|
|
wake_up_process(ailp->xa_task);
|
|
spin_unlock(&ailp->xa_lock);
|
|
schedule();
|
|
spin_lock(&ailp->xa_lock);
|
|
}
|
|
spin_unlock(&ailp->xa_lock);
|
|
|
|
finish_wait(&ailp->xa_empty, &wait);
|
|
}
|
|
|
|
/*
|
|
* xfs_trans_ail_update - bulk AIL insertion operation.
|
|
*
|
|
* @xfs_trans_ail_update takes an array of log items that all need to be
|
|
* positioned at the same LSN in the AIL. If an item is not in the AIL, it will
|
|
* be added. Otherwise, it will be repositioned by removing it and re-adding
|
|
* it to the AIL. If we move the first item in the AIL, update the log tail to
|
|
* match the new minimum LSN in the AIL.
|
|
*
|
|
* This function takes the AIL lock once to execute the update operations on
|
|
* all the items in the array, and as such should not be called with the AIL
|
|
* lock held. As a result, once we have the AIL lock, we need to check each log
|
|
* item LSN to confirm it needs to be moved forward in the AIL.
|
|
*
|
|
* To optimise the insert operation, we delete all the items from the AIL in
|
|
* the first pass, moving them into a temporary list, then splice the temporary
|
|
* list into the correct position in the AIL. This avoids needing to do an
|
|
* insert operation on every item.
|
|
*
|
|
* This function must be called with the AIL lock held. The lock is dropped
|
|
* before returning.
|
|
*/
|
|
void
|
|
xfs_trans_ail_update_bulk(
|
|
struct xfs_ail *ailp,
|
|
struct xfs_ail_cursor *cur,
|
|
struct xfs_log_item **log_items,
|
|
int nr_items,
|
|
xfs_lsn_t lsn) __releases(ailp->xa_lock)
|
|
{
|
|
xfs_log_item_t *mlip;
|
|
int mlip_changed = 0;
|
|
int i;
|
|
LIST_HEAD(tmp);
|
|
|
|
ASSERT(nr_items > 0); /* Not required, but true. */
|
|
mlip = xfs_ail_min(ailp);
|
|
|
|
for (i = 0; i < nr_items; i++) {
|
|
struct xfs_log_item *lip = log_items[i];
|
|
if (lip->li_flags & XFS_LI_IN_AIL) {
|
|
/* check if we really need to move the item */
|
|
if (XFS_LSN_CMP(lsn, lip->li_lsn) <= 0)
|
|
continue;
|
|
|
|
trace_xfs_ail_move(lip, lip->li_lsn, lsn);
|
|
xfs_ail_delete(ailp, lip);
|
|
if (mlip == lip)
|
|
mlip_changed = 1;
|
|
} else {
|
|
lip->li_flags |= XFS_LI_IN_AIL;
|
|
trace_xfs_ail_insert(lip, 0, lsn);
|
|
}
|
|
lip->li_lsn = lsn;
|
|
list_add(&lip->li_ail, &tmp);
|
|
}
|
|
|
|
if (!list_empty(&tmp))
|
|
xfs_ail_splice(ailp, cur, &tmp, lsn);
|
|
|
|
if (mlip_changed) {
|
|
if (!XFS_FORCED_SHUTDOWN(ailp->xa_mount))
|
|
xlog_assign_tail_lsn_locked(ailp->xa_mount);
|
|
spin_unlock(&ailp->xa_lock);
|
|
|
|
xfs_log_space_wake(ailp->xa_mount);
|
|
} else {
|
|
spin_unlock(&ailp->xa_lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* xfs_trans_ail_delete_bulk - remove multiple log items from the AIL
|
|
*
|
|
* @xfs_trans_ail_delete_bulk takes an array of log items that all need to
|
|
* removed from the AIL. The caller is already holding the AIL lock, and done
|
|
* all the checks necessary to ensure the items passed in via @log_items are
|
|
* ready for deletion. This includes checking that the items are in the AIL.
|
|
*
|
|
* For each log item to be removed, unlink it from the AIL, clear the IN_AIL
|
|
* flag from the item and reset the item's lsn to 0. If we remove the first
|
|
* item in the AIL, update the log tail to match the new minimum LSN in the
|
|
* AIL.
|
|
*
|
|
* This function will not drop the AIL lock until all items are removed from
|
|
* the AIL to minimise the amount of lock traffic on the AIL. This does not
|
|
* greatly increase the AIL hold time, but does significantly reduce the amount
|
|
* of traffic on the lock, especially during IO completion.
|
|
*
|
|
* This function must be called with the AIL lock held. The lock is dropped
|
|
* before returning.
|
|
*/
|
|
void
|
|
xfs_trans_ail_delete_bulk(
|
|
struct xfs_ail *ailp,
|
|
struct xfs_log_item **log_items,
|
|
int nr_items,
|
|
int shutdown_type) __releases(ailp->xa_lock)
|
|
{
|
|
xfs_log_item_t *mlip;
|
|
int mlip_changed = 0;
|
|
int i;
|
|
|
|
mlip = xfs_ail_min(ailp);
|
|
|
|
for (i = 0; i < nr_items; i++) {
|
|
struct xfs_log_item *lip = log_items[i];
|
|
if (!(lip->li_flags & XFS_LI_IN_AIL)) {
|
|
struct xfs_mount *mp = ailp->xa_mount;
|
|
|
|
spin_unlock(&ailp->xa_lock);
|
|
if (!XFS_FORCED_SHUTDOWN(mp)) {
|
|
xfs_alert_tag(mp, XFS_PTAG_AILDELETE,
|
|
"%s: attempting to delete a log item that is not in the AIL",
|
|
__func__);
|
|
xfs_force_shutdown(mp, shutdown_type);
|
|
}
|
|
return;
|
|
}
|
|
|
|
trace_xfs_ail_delete(lip, mlip->li_lsn, lip->li_lsn);
|
|
xfs_ail_delete(ailp, lip);
|
|
lip->li_flags &= ~XFS_LI_IN_AIL;
|
|
lip->li_lsn = 0;
|
|
if (mlip == lip)
|
|
mlip_changed = 1;
|
|
}
|
|
|
|
if (mlip_changed) {
|
|
if (!XFS_FORCED_SHUTDOWN(ailp->xa_mount))
|
|
xlog_assign_tail_lsn_locked(ailp->xa_mount);
|
|
if (list_empty(&ailp->xa_ail))
|
|
wake_up_all(&ailp->xa_empty);
|
|
spin_unlock(&ailp->xa_lock);
|
|
|
|
xfs_log_space_wake(ailp->xa_mount);
|
|
} else {
|
|
spin_unlock(&ailp->xa_lock);
|
|
}
|
|
}
|
|
|
|
int
|
|
xfs_trans_ail_init(
|
|
xfs_mount_t *mp)
|
|
{
|
|
struct xfs_ail *ailp;
|
|
|
|
ailp = kmem_zalloc(sizeof(struct xfs_ail), KM_MAYFAIL);
|
|
if (!ailp)
|
|
return -ENOMEM;
|
|
|
|
ailp->xa_mount = mp;
|
|
INIT_LIST_HEAD(&ailp->xa_ail);
|
|
INIT_LIST_HEAD(&ailp->xa_cursors);
|
|
spin_lock_init(&ailp->xa_lock);
|
|
INIT_LIST_HEAD(&ailp->xa_buf_list);
|
|
init_waitqueue_head(&ailp->xa_empty);
|
|
|
|
ailp->xa_task = kthread_run(xfsaild, ailp, "xfsaild/%s",
|
|
ailp->xa_mount->m_fsname);
|
|
if (IS_ERR(ailp->xa_task))
|
|
goto out_free_ailp;
|
|
|
|
mp->m_ail = ailp;
|
|
return 0;
|
|
|
|
out_free_ailp:
|
|
kmem_free(ailp);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
void
|
|
xfs_trans_ail_destroy(
|
|
xfs_mount_t *mp)
|
|
{
|
|
struct xfs_ail *ailp = mp->m_ail;
|
|
|
|
kthread_stop(ailp->xa_task);
|
|
kmem_free(ailp);
|
|
}
|