246 lines
6.1 KiB
C
246 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#ifndef __XFS_DQUOT_H__
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#define __XFS_DQUOT_H__
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/*
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* Dquots are structures that hold quota information about a user or a group,
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* much like inodes are for files. In fact, dquots share many characteristics
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* with inodes. However, dquots can also be a centralized resource, relative
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* to a collection of inodes. In this respect, dquots share some characteristics
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* of the superblock.
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* XFS dquots exploit both those in its algorithms. They make every attempt
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* to not be a bottleneck when quotas are on and have minimal impact, if any,
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* when quotas are off.
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*/
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struct xfs_mount;
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struct xfs_trans;
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enum {
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XFS_QLOWSP_1_PCNT = 0,
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XFS_QLOWSP_3_PCNT,
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XFS_QLOWSP_5_PCNT,
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XFS_QLOWSP_MAX
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};
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struct xfs_dquot_res {
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/* Total resources allocated and reserved. */
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xfs_qcnt_t reserved;
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/* Total resources allocated. */
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xfs_qcnt_t count;
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/* Absolute and preferred limits. */
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xfs_qcnt_t hardlimit;
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xfs_qcnt_t softlimit;
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/*
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* For root dquots, this is the default grace period, in seconds.
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* Otherwise, this is when the quota grace period expires,
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* in seconds since the Unix epoch.
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*/
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time64_t timer;
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};
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static inline bool
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xfs_dquot_res_over_limits(
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const struct xfs_dquot_res *qres)
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{
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if ((qres->softlimit && qres->softlimit < qres->reserved) ||
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(qres->hardlimit && qres->hardlimit < qres->reserved))
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return true;
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return false;
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}
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/*
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* The incore dquot structure
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*/
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struct xfs_dquot {
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struct list_head q_lru;
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struct xfs_mount *q_mount;
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xfs_dqtype_t q_type;
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uint16_t q_flags;
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xfs_dqid_t q_id;
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uint q_nrefs;
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int q_bufoffset;
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xfs_daddr_t q_blkno;
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xfs_fileoff_t q_fileoffset;
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struct xfs_dquot_res q_blk; /* regular blocks */
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struct xfs_dquot_res q_ino; /* inodes */
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struct xfs_dquot_res q_rtb; /* realtime blocks */
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struct xfs_dq_logitem q_logitem;
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xfs_qcnt_t q_prealloc_lo_wmark;
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xfs_qcnt_t q_prealloc_hi_wmark;
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int64_t q_low_space[XFS_QLOWSP_MAX];
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struct mutex q_qlock;
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struct completion q_flush;
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atomic_t q_pincount;
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struct wait_queue_head q_pinwait;
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};
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/*
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* Lock hierarchy for q_qlock:
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* XFS_QLOCK_NORMAL is the implicit default,
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* XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
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*/
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enum {
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XFS_QLOCK_NORMAL = 0,
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XFS_QLOCK_NESTED,
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};
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/*
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* Manage the q_flush completion queue embedded in the dquot. This completion
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* queue synchronizes processes attempting to flush the in-core dquot back to
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* disk.
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*/
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static inline void xfs_dqflock(struct xfs_dquot *dqp)
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{
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wait_for_completion(&dqp->q_flush);
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}
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static inline bool xfs_dqflock_nowait(struct xfs_dquot *dqp)
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{
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return try_wait_for_completion(&dqp->q_flush);
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}
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static inline void xfs_dqfunlock(struct xfs_dquot *dqp)
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{
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complete(&dqp->q_flush);
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}
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static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp)
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{
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return mutex_trylock(&dqp->q_qlock);
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}
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static inline void xfs_dqlock(struct xfs_dquot *dqp)
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{
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mutex_lock(&dqp->q_qlock);
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}
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static inline void xfs_dqunlock(struct xfs_dquot *dqp)
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{
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mutex_unlock(&dqp->q_qlock);
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}
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static inline int
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xfs_dquot_type(const struct xfs_dquot *dqp)
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{
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return dqp->q_type & XFS_DQTYPE_REC_MASK;
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}
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static inline int xfs_this_quota_on(struct xfs_mount *mp, xfs_dqtype_t type)
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{
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switch (type) {
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case XFS_DQTYPE_USER:
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return XFS_IS_UQUOTA_ON(mp);
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case XFS_DQTYPE_GROUP:
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return XFS_IS_GQUOTA_ON(mp);
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case XFS_DQTYPE_PROJ:
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return XFS_IS_PQUOTA_ON(mp);
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default:
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return 0;
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}
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}
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static inline struct xfs_dquot *xfs_inode_dquot(
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struct xfs_inode *ip,
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xfs_dqtype_t type)
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{
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switch (type) {
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case XFS_DQTYPE_USER:
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return ip->i_udquot;
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case XFS_DQTYPE_GROUP:
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return ip->i_gdquot;
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case XFS_DQTYPE_PROJ:
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return ip->i_pdquot;
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default:
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return NULL;
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}
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}
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/* Decide if the dquot's limits are actually being enforced. */
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static inline bool
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xfs_dquot_is_enforced(
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const struct xfs_dquot *dqp)
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{
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switch (xfs_dquot_type(dqp)) {
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case XFS_DQTYPE_USER:
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return XFS_IS_UQUOTA_ENFORCED(dqp->q_mount);
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case XFS_DQTYPE_GROUP:
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return XFS_IS_GQUOTA_ENFORCED(dqp->q_mount);
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case XFS_DQTYPE_PROJ:
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return XFS_IS_PQUOTA_ENFORCED(dqp->q_mount);
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}
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ASSERT(0);
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return false;
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}
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/*
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* Check whether a dquot is under low free space conditions. We assume the quota
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* is enabled and enforced.
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*/
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static inline bool xfs_dquot_lowsp(struct xfs_dquot *dqp)
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{
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int64_t freesp;
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freesp = dqp->q_blk.hardlimit - dqp->q_blk.reserved;
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if (freesp < dqp->q_low_space[XFS_QLOWSP_1_PCNT])
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return true;
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return false;
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}
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void xfs_dquot_to_disk(struct xfs_disk_dquot *ddqp, struct xfs_dquot *dqp);
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#define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock)))
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#define XFS_DQ_IS_DIRTY(dqp) ((dqp)->q_flags & XFS_DQFLAG_DIRTY)
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void xfs_qm_dqdestroy(struct xfs_dquot *dqp);
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int xfs_qm_dqflush(struct xfs_dquot *dqp, struct xfs_buf **bpp);
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void xfs_qm_dqunpin_wait(struct xfs_dquot *dqp);
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void xfs_qm_adjust_dqtimers(struct xfs_dquot *d);
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void xfs_qm_adjust_dqlimits(struct xfs_dquot *d);
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xfs_dqid_t xfs_qm_id_for_quotatype(struct xfs_inode *ip,
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xfs_dqtype_t type);
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int xfs_qm_dqget(struct xfs_mount *mp, xfs_dqid_t id,
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xfs_dqtype_t type, bool can_alloc,
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struct xfs_dquot **dqpp);
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int xfs_qm_dqget_inode(struct xfs_inode *ip, xfs_dqtype_t type,
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bool can_alloc, struct xfs_dquot **dqpp);
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int xfs_qm_dqget_next(struct xfs_mount *mp, xfs_dqid_t id,
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xfs_dqtype_t type, struct xfs_dquot **dqpp);
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int xfs_qm_dqget_uncached(struct xfs_mount *mp,
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xfs_dqid_t id, xfs_dqtype_t type,
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struct xfs_dquot **dqpp);
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void xfs_qm_dqput(struct xfs_dquot *dqp);
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void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
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void xfs_dquot_set_prealloc_limits(struct xfs_dquot *);
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static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp)
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{
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xfs_dqlock(dqp);
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dqp->q_nrefs++;
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xfs_dqunlock(dqp);
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return dqp;
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}
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typedef int (*xfs_qm_dqiterate_fn)(struct xfs_dquot *dq,
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xfs_dqtype_t type, void *priv);
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int xfs_qm_dqiterate(struct xfs_mount *mp, xfs_dqtype_t type,
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xfs_qm_dqiterate_fn iter_fn, void *priv);
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time64_t xfs_dquot_set_timeout(struct xfs_mount *mp, time64_t timeout);
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time64_t xfs_dquot_set_grace_period(time64_t grace);
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#endif /* __XFS_DQUOT_H__ */
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