482 lines
12 KiB
C
482 lines
12 KiB
C
/*
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* Copyright (c) 2000-2003 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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#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_inode.h"
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#include "xfs_quota.h"
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#include "xfs_error.h"
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#include "xfs_trans.h"
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#include "xfs_buf_item.h"
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#include "xfs_trans_priv.h"
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#include "xfs_qm.h"
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#include "xfs_log.h"
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static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
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{
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return container_of(lip, struct xfs_dq_logitem, qli_item);
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}
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/*
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* returns the number of iovecs needed to log the given dquot item.
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*/
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STATIC void
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xfs_qm_dquot_logitem_size(
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struct xfs_log_item *lip,
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int *nvecs,
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int *nbytes)
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{
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*nvecs += 2;
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*nbytes += sizeof(struct xfs_dq_logformat) +
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sizeof(struct xfs_disk_dquot);
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}
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/*
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* fills in the vector of log iovecs for the given dquot log item.
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*/
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STATIC void
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xfs_qm_dquot_logitem_format(
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struct xfs_log_item *lip,
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struct xfs_log_vec *lv)
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{
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struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
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struct xfs_log_iovec *vecp = NULL;
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struct xfs_dq_logformat *qlf;
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qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QFORMAT);
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qlf->qlf_type = XFS_LI_DQUOT;
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qlf->qlf_size = 2;
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qlf->qlf_id = be32_to_cpu(qlip->qli_dquot->q_core.d_id);
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qlf->qlf_blkno = qlip->qli_dquot->q_blkno;
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qlf->qlf_len = 1;
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qlf->qlf_boffset = qlip->qli_dquot->q_bufoffset;
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xlog_finish_iovec(lv, vecp, sizeof(struct xfs_dq_logformat));
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xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_DQUOT,
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&qlip->qli_dquot->q_core,
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sizeof(struct xfs_disk_dquot));
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}
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/*
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* Increment the pin count of the given dquot.
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*/
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STATIC void
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xfs_qm_dquot_logitem_pin(
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struct xfs_log_item *lip)
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{
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struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
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ASSERT(XFS_DQ_IS_LOCKED(dqp));
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atomic_inc(&dqp->q_pincount);
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}
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/*
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* Decrement the pin count of the given dquot, and wake up
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* anyone in xfs_dqwait_unpin() if the count goes to 0. The
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* dquot must have been previously pinned with a call to
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* xfs_qm_dquot_logitem_pin().
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*/
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STATIC void
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xfs_qm_dquot_logitem_unpin(
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struct xfs_log_item *lip,
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int remove)
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{
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struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
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ASSERT(atomic_read(&dqp->q_pincount) > 0);
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if (atomic_dec_and_test(&dqp->q_pincount))
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wake_up(&dqp->q_pinwait);
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}
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STATIC xfs_lsn_t
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xfs_qm_dquot_logitem_committed(
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struct xfs_log_item *lip,
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xfs_lsn_t lsn)
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{
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/*
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* We always re-log the entire dquot when it becomes dirty,
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* so, the latest copy _is_ the only one that matters.
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*/
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return lsn;
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}
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/*
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* This is called to wait for the given dquot to be unpinned.
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* Most of these pin/unpin routines are plagiarized from inode code.
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*/
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void
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xfs_qm_dqunpin_wait(
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struct xfs_dquot *dqp)
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{
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ASSERT(XFS_DQ_IS_LOCKED(dqp));
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if (atomic_read(&dqp->q_pincount) == 0)
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return;
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/*
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* Give the log a push so we don't wait here too long.
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*/
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xfs_log_force(dqp->q_mount, 0);
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wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
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}
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/*
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* Callback used to mark a buffer with XFS_LI_FAILED when items in the buffer
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* have been failed during writeback
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*
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* this informs the AIL that the dquot is already flush locked on the next push,
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* and acquires a hold on the buffer to ensure that it isn't reclaimed before
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* dirty data makes it to disk.
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*/
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STATIC void
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xfs_dquot_item_error(
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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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struct xfs_dquot *dqp;
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dqp = DQUOT_ITEM(lip)->qli_dquot;
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ASSERT(!completion_done(&dqp->q_flush));
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xfs_set_li_failed(lip, bp);
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}
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STATIC uint
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xfs_qm_dquot_logitem_push(
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struct xfs_log_item *lip,
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struct list_head *buffer_list) __releases(&lip->li_ailp->xa_lock)
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__acquires(&lip->li_ailp->xa_lock)
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{
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struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
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struct xfs_buf *bp = lip->li_buf;
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uint rval = XFS_ITEM_SUCCESS;
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int error;
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if (atomic_read(&dqp->q_pincount) > 0)
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return XFS_ITEM_PINNED;
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/*
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* The buffer containing this item failed to be written back
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* previously. Resubmit the buffer for IO
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*/
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if (lip->li_flags & XFS_LI_FAILED) {
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if (!xfs_buf_trylock(bp))
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return XFS_ITEM_LOCKED;
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if (!xfs_buf_resubmit_failed_buffers(bp, lip, buffer_list))
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rval = XFS_ITEM_FLUSHING;
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xfs_buf_unlock(bp);
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return rval;
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}
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if (!xfs_dqlock_nowait(dqp))
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return XFS_ITEM_LOCKED;
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/*
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* Re-check the pincount now that we stabilized the value by
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* taking the quota lock.
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*/
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if (atomic_read(&dqp->q_pincount) > 0) {
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rval = XFS_ITEM_PINNED;
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goto out_unlock;
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}
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/*
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* Someone else is already flushing the dquot. Nothing we can do
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* here but wait for the flush to finish and remove the item from
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* the AIL.
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*/
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if (!xfs_dqflock_nowait(dqp)) {
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rval = XFS_ITEM_FLUSHING;
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goto out_unlock;
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}
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spin_unlock(&lip->li_ailp->xa_lock);
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error = xfs_qm_dqflush(dqp, &bp);
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if (error) {
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xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p",
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__func__, error, dqp);
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} else {
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if (!xfs_buf_delwri_queue(bp, buffer_list))
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rval = XFS_ITEM_FLUSHING;
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xfs_buf_relse(bp);
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}
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spin_lock(&lip->li_ailp->xa_lock);
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out_unlock:
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xfs_dqunlock(dqp);
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return rval;
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}
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/*
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* Unlock the dquot associated with the log item.
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* Clear the fields of the dquot and dquot log item that
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* are specific to the current transaction. If the
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* hold flags is set, do not unlock the dquot.
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*/
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STATIC void
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xfs_qm_dquot_logitem_unlock(
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struct xfs_log_item *lip)
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{
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struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
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ASSERT(XFS_DQ_IS_LOCKED(dqp));
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/*
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* Clear the transaction pointer in the dquot
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*/
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dqp->q_transp = NULL;
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/*
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* dquots are never 'held' from getting unlocked at the end of
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* a transaction. Their locking and unlocking is hidden inside the
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* transaction layer, within trans_commit. Hence, no LI_HOLD flag
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* for the logitem.
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*/
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xfs_dqunlock(dqp);
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}
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/*
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* this needs to stamp an lsn into the dquot, I think.
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* rpc's that look at user dquot's would then have to
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* push on the dependency recorded in the dquot
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*/
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STATIC void
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xfs_qm_dquot_logitem_committing(
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struct xfs_log_item *lip,
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xfs_lsn_t lsn)
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{
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}
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/*
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* This is the ops vector for dquots
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*/
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static const struct xfs_item_ops xfs_dquot_item_ops = {
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.iop_size = xfs_qm_dquot_logitem_size,
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.iop_format = xfs_qm_dquot_logitem_format,
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.iop_pin = xfs_qm_dquot_logitem_pin,
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.iop_unpin = xfs_qm_dquot_logitem_unpin,
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.iop_unlock = xfs_qm_dquot_logitem_unlock,
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.iop_committed = xfs_qm_dquot_logitem_committed,
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.iop_push = xfs_qm_dquot_logitem_push,
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.iop_committing = xfs_qm_dquot_logitem_committing,
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.iop_error = xfs_dquot_item_error
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};
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/*
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* Initialize the dquot log item for a newly allocated dquot.
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* The dquot isn't locked at this point, but it isn't on any of the lists
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* either, so we don't care.
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*/
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void
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xfs_qm_dquot_logitem_init(
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struct xfs_dquot *dqp)
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{
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struct xfs_dq_logitem *lp = &dqp->q_logitem;
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xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
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&xfs_dquot_item_ops);
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lp->qli_dquot = dqp;
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}
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/*------------------ QUOTAOFF LOG ITEMS -------------------*/
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static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
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{
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return container_of(lip, struct xfs_qoff_logitem, qql_item);
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}
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/*
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* This returns the number of iovecs needed to log the given quotaoff item.
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* We only need 1 iovec for an quotaoff item. It just logs the
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* quotaoff_log_format structure.
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*/
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STATIC void
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xfs_qm_qoff_logitem_size(
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struct xfs_log_item *lip,
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int *nvecs,
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int *nbytes)
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{
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*nvecs += 1;
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*nbytes += sizeof(struct xfs_qoff_logitem);
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}
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STATIC void
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xfs_qm_qoff_logitem_format(
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struct xfs_log_item *lip,
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struct xfs_log_vec *lv)
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{
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struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
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struct xfs_log_iovec *vecp = NULL;
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struct xfs_qoff_logformat *qlf;
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qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QUOTAOFF);
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qlf->qf_type = XFS_LI_QUOTAOFF;
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qlf->qf_size = 1;
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qlf->qf_flags = qflip->qql_flags;
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xlog_finish_iovec(lv, vecp, sizeof(struct xfs_qoff_logitem));
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}
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/*
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* Pinning has no meaning for an quotaoff item, so just return.
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*/
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STATIC void
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xfs_qm_qoff_logitem_pin(
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struct xfs_log_item *lip)
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{
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}
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/*
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* Since pinning has no meaning for an quotaoff item, unpinning does
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* not either.
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*/
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STATIC void
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xfs_qm_qoff_logitem_unpin(
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struct xfs_log_item *lip,
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int remove)
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{
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}
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/*
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* There isn't much you can do to push a quotaoff item. It is simply
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* stuck waiting for the log to be flushed to disk.
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*/
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STATIC uint
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xfs_qm_qoff_logitem_push(
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struct xfs_log_item *lip,
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struct list_head *buffer_list)
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{
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return XFS_ITEM_LOCKED;
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}
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/*
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* Quotaoff items have no locking or pushing, so return failure
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* so that the caller doesn't bother with us.
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*/
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STATIC void
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xfs_qm_qoff_logitem_unlock(
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struct xfs_log_item *lip)
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{
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}
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/*
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* The quotaoff-start-item is logged only once and cannot be moved in the log,
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* so simply return the lsn at which it's been logged.
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*/
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STATIC xfs_lsn_t
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xfs_qm_qoff_logitem_committed(
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struct xfs_log_item *lip,
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xfs_lsn_t lsn)
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{
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return lsn;
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}
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STATIC xfs_lsn_t
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xfs_qm_qoffend_logitem_committed(
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struct xfs_log_item *lip,
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xfs_lsn_t lsn)
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{
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struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip);
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struct xfs_qoff_logitem *qfs = qfe->qql_start_lip;
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struct xfs_ail *ailp = qfs->qql_item.li_ailp;
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/*
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* Delete the qoff-start logitem from the AIL.
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* xfs_trans_ail_delete() drops the AIL lock.
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*/
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spin_lock(&ailp->xa_lock);
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xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR);
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kmem_free(qfs->qql_item.li_lv_shadow);
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kmem_free(lip->li_lv_shadow);
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kmem_free(qfs);
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kmem_free(qfe);
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return (xfs_lsn_t)-1;
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}
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/*
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* XXX rcc - don't know quite what to do with this. I think we can
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* just ignore it. The only time that isn't the case is if we allow
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* the client to somehow see that quotas have been turned off in which
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* we can't allow that to get back until the quotaoff hits the disk.
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* So how would that happen? Also, do we need different routines for
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* quotaoff start and quotaoff end? I suspect the answer is yes but
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* to be sure, I need to look at the recovery code and see how quota off
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* recovery is handled (do we roll forward or back or do something else).
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* If we roll forwards or backwards, then we need two separate routines,
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* one that does nothing and one that stamps in the lsn that matters
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* (truly makes the quotaoff irrevocable). If we do something else,
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* then maybe we don't need two.
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*/
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STATIC void
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xfs_qm_qoff_logitem_committing(
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struct xfs_log_item *lip,
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xfs_lsn_t commit_lsn)
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{
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}
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static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
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.iop_size = xfs_qm_qoff_logitem_size,
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.iop_format = xfs_qm_qoff_logitem_format,
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.iop_pin = xfs_qm_qoff_logitem_pin,
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.iop_unpin = xfs_qm_qoff_logitem_unpin,
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.iop_unlock = xfs_qm_qoff_logitem_unlock,
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.iop_committed = xfs_qm_qoffend_logitem_committed,
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.iop_push = xfs_qm_qoff_logitem_push,
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.iop_committing = xfs_qm_qoff_logitem_committing
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};
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/*
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* This is the ops vector shared by all quotaoff-start log items.
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*/
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static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
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.iop_size = xfs_qm_qoff_logitem_size,
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.iop_format = xfs_qm_qoff_logitem_format,
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.iop_pin = xfs_qm_qoff_logitem_pin,
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.iop_unpin = xfs_qm_qoff_logitem_unpin,
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.iop_unlock = xfs_qm_qoff_logitem_unlock,
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.iop_committed = xfs_qm_qoff_logitem_committed,
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.iop_push = xfs_qm_qoff_logitem_push,
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.iop_committing = xfs_qm_qoff_logitem_committing
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};
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/*
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* Allocate and initialize an quotaoff item of the correct quota type(s).
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*/
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struct xfs_qoff_logitem *
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xfs_qm_qoff_logitem_init(
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struct xfs_mount *mp,
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struct xfs_qoff_logitem *start,
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uint flags)
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{
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struct xfs_qoff_logitem *qf;
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qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP);
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xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
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&xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
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qf->qql_item.li_mountp = mp;
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qf->qql_start_lip = start;
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qf->qql_flags = flags;
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return qf;
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}
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