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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (c) 2000-2003 Silicon Graphics, Inc.
- * All Rights Reserved.
- */
- #include "xfs.h"
- #include "xfs_fs.h"
- #include "xfs_shared.h"
- #include "xfs_format.h"
- #include "xfs_log_format.h"
- #include "xfs_trans_resv.h"
- #include "xfs_mount.h"
- #include "xfs_inode.h"
- #include "xfs_quota.h"
- #include "xfs_trans.h"
- #include "xfs_buf_item.h"
- #include "xfs_trans_priv.h"
- #include "xfs_qm.h"
- #include "xfs_log.h"
- static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
- {
- return container_of(lip, struct xfs_dq_logitem, qli_item);
- }
- /*
- * returns the number of iovecs needed to log the given dquot item.
- */
- STATIC void
- xfs_qm_dquot_logitem_size(
- struct xfs_log_item *lip,
- int *nvecs,
- int *nbytes)
- {
- *nvecs += 2;
- *nbytes += sizeof(struct xfs_dq_logformat) +
- sizeof(struct xfs_disk_dquot);
- }
- /*
- * fills in the vector of log iovecs for the given dquot log item.
- */
- STATIC void
- xfs_qm_dquot_logitem_format(
- struct xfs_log_item *lip,
- struct xfs_log_vec *lv)
- {
- struct xfs_disk_dquot ddq;
- struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
- struct xfs_log_iovec *vecp = NULL;
- struct xfs_dq_logformat *qlf;
- qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QFORMAT);
- qlf->qlf_type = XFS_LI_DQUOT;
- qlf->qlf_size = 2;
- qlf->qlf_id = qlip->qli_dquot->q_id;
- qlf->qlf_blkno = qlip->qli_dquot->q_blkno;
- qlf->qlf_len = 1;
- qlf->qlf_boffset = qlip->qli_dquot->q_bufoffset;
- xlog_finish_iovec(lv, vecp, sizeof(struct xfs_dq_logformat));
- xfs_dquot_to_disk(&ddq, qlip->qli_dquot);
- xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_DQUOT, &ddq,
- sizeof(struct xfs_disk_dquot));
- }
- /*
- * Increment the pin count of the given dquot.
- */
- STATIC void
- xfs_qm_dquot_logitem_pin(
- struct xfs_log_item *lip)
- {
- struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
- ASSERT(XFS_DQ_IS_LOCKED(dqp));
- atomic_inc(&dqp->q_pincount);
- }
- /*
- * Decrement the pin count of the given dquot, and wake up
- * anyone in xfs_dqwait_unpin() if the count goes to 0. The
- * dquot must have been previously pinned with a call to
- * xfs_qm_dquot_logitem_pin().
- */
- STATIC void
- xfs_qm_dquot_logitem_unpin(
- struct xfs_log_item *lip,
- int remove)
- {
- struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
- ASSERT(atomic_read(&dqp->q_pincount) > 0);
- if (atomic_dec_and_test(&dqp->q_pincount))
- wake_up(&dqp->q_pinwait);
- }
- /*
- * This is called to wait for the given dquot to be unpinned.
- * Most of these pin/unpin routines are plagiarized from inode code.
- */
- void
- xfs_qm_dqunpin_wait(
- struct xfs_dquot *dqp)
- {
- ASSERT(XFS_DQ_IS_LOCKED(dqp));
- if (atomic_read(&dqp->q_pincount) == 0)
- return;
- /*
- * Give the log a push so we don't wait here too long.
- */
- xfs_log_force(dqp->q_mount, 0);
- wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
- }
- STATIC uint
- xfs_qm_dquot_logitem_push(
- struct xfs_log_item *lip,
- struct list_head *buffer_list)
- __releases(&lip->li_ailp->ail_lock)
- __acquires(&lip->li_ailp->ail_lock)
- {
- struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
- struct xfs_buf *bp = lip->li_buf;
- uint rval = XFS_ITEM_SUCCESS;
- int error;
- if (atomic_read(&dqp->q_pincount) > 0)
- return XFS_ITEM_PINNED;
- if (!xfs_dqlock_nowait(dqp))
- return XFS_ITEM_LOCKED;
- /*
- * Re-check the pincount now that we stabilized the value by
- * taking the quota lock.
- */
- if (atomic_read(&dqp->q_pincount) > 0) {
- rval = XFS_ITEM_PINNED;
- goto out_unlock;
- }
- /*
- * Someone else is already flushing the dquot. Nothing we can do
- * here but wait for the flush to finish and remove the item from
- * the AIL.
- */
- if (!xfs_dqflock_nowait(dqp)) {
- rval = XFS_ITEM_FLUSHING;
- goto out_unlock;
- }
- spin_unlock(&lip->li_ailp->ail_lock);
- error = xfs_qm_dqflush(dqp, &bp);
- if (!error) {
- if (!xfs_buf_delwri_queue(bp, buffer_list))
- rval = XFS_ITEM_FLUSHING;
- xfs_buf_relse(bp);
- } else if (error == -EAGAIN)
- rval = XFS_ITEM_LOCKED;
- spin_lock(&lip->li_ailp->ail_lock);
- out_unlock:
- xfs_dqunlock(dqp);
- return rval;
- }
- STATIC void
- xfs_qm_dquot_logitem_release(
- struct xfs_log_item *lip)
- {
- struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
- ASSERT(XFS_DQ_IS_LOCKED(dqp));
- /*
- * dquots are never 'held' from getting unlocked at the end of
- * a transaction. Their locking and unlocking is hidden inside the
- * transaction layer, within trans_commit. Hence, no LI_HOLD flag
- * for the logitem.
- */
- xfs_dqunlock(dqp);
- }
- STATIC void
- xfs_qm_dquot_logitem_committing(
- struct xfs_log_item *lip,
- xfs_csn_t seq)
- {
- return xfs_qm_dquot_logitem_release(lip);
- }
- static const struct xfs_item_ops xfs_dquot_item_ops = {
- .iop_size = xfs_qm_dquot_logitem_size,
- .iop_format = xfs_qm_dquot_logitem_format,
- .iop_pin = xfs_qm_dquot_logitem_pin,
- .iop_unpin = xfs_qm_dquot_logitem_unpin,
- .iop_release = xfs_qm_dquot_logitem_release,
- .iop_committing = xfs_qm_dquot_logitem_committing,
- .iop_push = xfs_qm_dquot_logitem_push,
- };
- /*
- * Initialize the dquot log item for a newly allocated dquot.
- * The dquot isn't locked at this point, but it isn't on any of the lists
- * either, so we don't care.
- */
- void
- xfs_qm_dquot_logitem_init(
- struct xfs_dquot *dqp)
- {
- struct xfs_dq_logitem *lp = &dqp->q_logitem;
- xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
- &xfs_dquot_item_ops);
- lp->qli_dquot = dqp;
- }
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