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Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Copyright (c) 2000-2005 Silicon Graphics, Inc.
	4	* All Rights Reserved.
	5	*/
	6	#ifndef __XFS_DQUOT_H__
	7	#define __XFS_DQUOT_H__
	8
	9	/*
	10	* Dquots are structures that hold quota information about a user or a group,
	11	* much like inodes are for files. In fact, dquots share many characteristics
	12	* with inodes. However, dquots can also be a centralized resource, relative
	13	* to a collection of inodes. In this respect, dquots share some characteristics
	14	* of the superblock.
	15	* XFS dquots exploit both those in its algorithms. They make every attempt
	16	* to not be a bottleneck when quotas are on and have minimal impact, if any,
	17	* when quotas are off.
	18	*/
	19
	20	struct xfs_mount;
	21	struct xfs_trans;
	22
	23	enum {
	24	XFS_QLOWSP_1_PCNT = 0,
	25	XFS_QLOWSP_3_PCNT,
	26	XFS_QLOWSP_5_PCNT,
	27	XFS_QLOWSP_MAX
	28	};
	29
	30	/*
	31	* The incore dquot structure
	32	*/
	33	struct xfs_dquot {
	34	uint dq_flags;
	35	struct list_head q_lru;
	36	struct xfs_mount *q_mount;
	37	uint q_nrefs;
	38	xfs_daddr_t q_blkno;
	39	int q_bufoffset;
	40	xfs_fileoff_t q_fileoffset;
	41
	42	struct xfs_disk_dquot q_core;
	43	struct xfs_dq_logitem q_logitem;
	44	/* total regular nblks used+reserved */
	45	xfs_qcnt_t q_res_bcount;
	46	/* total inos allocd+reserved */
	47	xfs_qcnt_t q_res_icount;
	48	/* total realtime blks used+reserved */
	49	xfs_qcnt_t q_res_rtbcount;
	50	xfs_qcnt_t q_prealloc_lo_wmark;
	51	xfs_qcnt_t q_prealloc_hi_wmark;
	52	int64_t q_low_space[XFS_QLOWSP_MAX];
	53	struct mutex q_qlock;
	54	struct completion q_flush;
	55	atomic_t q_pincount;
	56	struct wait_queue_head q_pinwait;
	57	};
	58
	59	/*
	60	* Lock hierarchy for q_qlock:
	61	* XFS_QLOCK_NORMAL is the implicit default,
	62	* XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
	63	*/
	64	enum {
	65	XFS_QLOCK_NORMAL = 0,
	66	XFS_QLOCK_NESTED,
	67	};
	68
	69	/*
	70	* Manage the q_flush completion queue embedded in the dquot. This completion
	71	* queue synchronizes processes attempting to flush the in-core dquot back to
	72	* disk.
	73	*/
	74	static inline void xfs_dqflock(struct xfs_dquot *dqp)
	75	{
	76	wait_for_completion(&dqp->q_flush);
	77	}
	78
	79	static inline bool xfs_dqflock_nowait(struct xfs_dquot *dqp)
	80	{
	81	return try_wait_for_completion(&dqp->q_flush);
	82	}
	83
	84	static inline void xfs_dqfunlock(struct xfs_dquot *dqp)
	85	{
	86	complete(&dqp->q_flush);
	87	}
	88
	89	static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp)
	90	{
	91	return mutex_trylock(&dqp->q_qlock);
	92	}
	93
	94	static inline void xfs_dqlock(struct xfs_dquot *dqp)
	95	{
	96	mutex_lock(&dqp->q_qlock);
	97	}
	98
	99	static inline void xfs_dqunlock(struct xfs_dquot *dqp)
	100	{
	101	mutex_unlock(&dqp->q_qlock);
	102	}
	103
	104	static inline int xfs_this_quota_on(struct xfs_mount *mp, int type)
	105	{
	106	switch (type & XFS_DQ_ALLTYPES) {
	107	case XFS_DQ_USER:
	108	return XFS_IS_UQUOTA_ON(mp);
	109	case XFS_DQ_GROUP:
	110	return XFS_IS_GQUOTA_ON(mp);
	111	case XFS_DQ_PROJ:
	112	return XFS_IS_PQUOTA_ON(mp);
	113	default:
	114	return 0;
	115	}
	116	}
	117
	118	static inline struct xfs_dquot xfs_inode_dquot(struct xfs_inode ip, int type)
	119	{
	120	switch (type & XFS_DQ_ALLTYPES) {
	121	case XFS_DQ_USER:
	122	return ip->i_udquot;
	123	case XFS_DQ_GROUP:
	124	return ip->i_gdquot;
	125	case XFS_DQ_PROJ:
	126	return ip->i_pdquot;
	127	default:
	128	return NULL;
	129	}
	130	}
	131
	132	/*
	133	* Check whether a dquot is under low free space conditions. We assume the quota
	134	* is enabled and enforced.
	135	*/
	136	static inline bool xfs_dquot_lowsp(struct xfs_dquot *dqp)
	137	{
	138	int64_t freesp;
	139
	140	freesp = be64_to_cpu(dqp->q_core.d_blk_hardlimit) - dqp->q_res_bcount;
	141	if (freesp < dqp->q_low_space[XFS_QLOWSP_1_PCNT])
	142	return true;
	143
	144	return false;
	145	}
	146
	147	#define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock)))
	148	#define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY)
	149	#define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER)
	150	#define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ)
	151	#define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP)
	152
	153	void xfs_qm_dqdestroy(struct xfs_dquot *dqp);
	154	int xfs_qm_dqflush(struct xfs_dquot dqp, struct xfs_buf *bpp);
	155	void xfs_qm_dqunpin_wait(struct xfs_dquot *dqp);
	156	void xfs_qm_adjust_dqtimers(struct xfs_mount *mp,
	157	struct xfs_disk_dquot *d);
	158	void xfs_qm_adjust_dqlimits(struct xfs_mount *mp,
	159	struct xfs_dquot *d);
	160	xfs_dqid_t xfs_qm_id_for_quotatype(struct xfs_inode *ip, uint type);
	161	int xfs_qm_dqget(struct xfs_mount *mp, xfs_dqid_t id,
	162	uint type, bool can_alloc,
	163	struct xfs_dquot **dqpp);
	164	int xfs_qm_dqget_inode(struct xfs_inode *ip, uint type,
	165	bool can_alloc,
	166	struct xfs_dquot **dqpp);
	167	int xfs_qm_dqget_next(struct xfs_mount *mp, xfs_dqid_t id,
	168	uint type, struct xfs_dquot **dqpp);
	169	int xfs_qm_dqget_uncached(struct xfs_mount *mp,
	170	xfs_dqid_t id, uint type,
	171	struct xfs_dquot **dqpp);
	172	void xfs_qm_dqput(struct xfs_dquot *dqp);
	173
	174	void xfs_dqlock2(struct xfs_dquot , struct xfs_dquot );
	175
	176	void xfs_dquot_set_prealloc_limits(struct xfs_dquot *);
	177
	178	static inline struct xfs_dquot xfs_qm_dqhold(struct xfs_dquot dqp)
	179	{
	180	xfs_dqlock(dqp);
	181	dqp->q_nrefs++;
	182	xfs_dqunlock(dqp);
	183	return dqp;
	184	}
	185
	186	typedef int (xfs_qm_dqiterate_fn)(struct xfs_dquot dq, uint dqtype,
	187	void *priv);
	188	int xfs_qm_dqiterate(struct xfs_mount *mp, uint dqtype,
	189	xfs_qm_dqiterate_fn iter_fn, void *priv);
	190
	191	#endif /* __XFS_DQUOT_H__ */