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220 lines
5.2 KiB
220 lines
5.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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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#include "xfs.h" |
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#include "xfs_fs.h" |
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#include "xfs_shared.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_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_disk_dquot ddq; |
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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 = qlip->qli_dquot->q_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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xfs_dquot_to_disk(&ddq, qlip->qli_dquot); |
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xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_DQUOT, &ddq, |
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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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/* |
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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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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) |
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__releases(&lip->li_ailp->ail_lock) |
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__acquires(&lip->li_ailp->ail_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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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->ail_lock); |
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error = xfs_qm_dqflush(dqp, &bp); |
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if (!error) { |
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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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} else if (error == -EAGAIN) |
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rval = XFS_ITEM_LOCKED; |
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spin_lock(&lip->li_ailp->ail_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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STATIC void |
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xfs_qm_dquot_logitem_release( |
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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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* 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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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_csn_t seq) |
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{ |
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return xfs_qm_dquot_logitem_release(lip); |
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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_release = xfs_qm_dquot_logitem_release, |
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.iop_committing = xfs_qm_dquot_logitem_committing, |
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.iop_push = xfs_qm_dquot_logitem_push, |
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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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