path: root/fs/xfs/xfs_dquot.c

// 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_format.h"
#include "xfs_log_format.h"
#include "xfs_shared.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_quota.h"
#include "xfs_trans.h"
#include "xfs_buf_item.h"
#include "xfs_trans_space.h"
#include "xfs_trans_priv.h"
#include "xfs_qm.h"
#include "xfs_trace.h"
#include "xfs_log.h"
#include "xfs_bmap_btree.h"

/*
 * Lock order:
 *
 * ip->i_lock
 *   qi->qi_tree_lock
 *     dquot->q_qlock (xfs_dqlock() and friends)
 *       dquot->q_flush (xfs_dqflock() and friends)
 *       qi->qi_lru_lock
 *
 * If two dquots need to be locked the order is user before group/project,
 * otherwise by the lowest id first, see xfs_dqlock2.
 */

struct kmem_zone		*xfs_qm_dqtrxzone;
static struct kmem_zone		*xfs_qm_dqzone;

static struct lock_class_key xfs_dquot_group_class;
static struct lock_class_key xfs_dquot_project_class;

/*
 * This is called to free all the memory associated with a dquot
 */
void
xfs_qm_dqdestroy(
	xfs_dquot_t	*dqp)
{
	ASSERT(list_empty(&dqp->q_lru));

	kmem_free(dqp->q_logitem.qli_item.li_lv_shadow);
	mutex_destroy(&dqp->q_qlock);

	XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot);
	kmem_zone_free(xfs_qm_dqzone, dqp);
}

/*
 * If default limits are in force, push them into the dquot now.
 * We overwrite the dquot limits only if they are zero and this
 * is not the root dquot.
 */
void
xfs_qm_adjust_dqlimits(
	struct xfs_mount	*mp,
	struct xfs_dquot	*dq)
{
	struct xfs_quotainfo	*q = mp->m_quotainfo;
	struct xfs_disk_dquot	*d = &dq->q_core;
	struct xfs_def_quota	*defq;
	int			prealloc = 0;

	ASSERT(d->d_id);
	defq = xfs_get_defquota(dq, q);

	if (defq->bsoftlimit && !d->d_blk_softlimit) {
		d->d_blk_softlimit = cpu_to_be64(defq->bsoftlimit);
		prealloc = 1;
	}
	if (defq->bhardlimit && !d->d_blk_hardlimit) {
		d->d_blk_hardlimit = cpu_to_be64(defq->bhardlimit);
		prealloc = 1;
	}
	if (defq->isoftlimit && !d->d_ino_softlimit)
		d->d_ino_softlimit = cpu_to_be64(defq->isoftlimit);
	if (defq->ihardlimit && !d->d_ino_hardlimit)
		d->d_ino_hardlimit = cpu_to_be64(defq->ihardlimit);
	if (defq->rtbsoftlimit && !d->d_rtb_softlimit)
		d->d_rtb_softlimit = cpu_to_be64(defq->rtbsoftlimit);
	if (defq->rtbhardlimit && !d->d_rtb_hardlimit)
		d->d_rtb_hardlimit = cpu_to_be64(defq->rtbhardlimit);

	if (prealloc)
		xfs_dquot_set_prealloc_limits(dq);
}

/*
 * Check the limits and timers of a dquot and start or reset timers
 * if necessary.
 * This gets called even when quota enforcement is OFF, which makes our
 * life a little less complicated. (We just don't reject any quota
 * reservations in that case, when enforcement is off).
 * We also return 0 as the values of the timers in Q_GETQUOTA calls, when
 * enforcement's off.
 * In contrast, warnings are a little different in that they don't
 * 'automatically' get started when limits get exceeded.  They do
 * get reset to zero, however, when we find the count to be under
 * the soft limit (they are only ever set non-zero via userspace).
 */
void
xfs_qm_adjust_dqtimers(
	xfs_mount_t		*mp,
	xfs_disk_dquot_t	*d)
{
	ASSERT(d->