xfs_quota.h

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
  4 * All Rights Reserved.
  5 */
  6#ifndef __XFS_QUOTA_H__
  7#define __XFS_QUOTA_H__
  8
  9#include "xfs_quota_defs.h"
 10
 11/*
 12 * Kernel only quota definitions and functions
 13 */
 14
 15struct xfs_trans;
 16struct xfs_buf;
 17
 18/*
 19 * This check is done typically without holding the inode lock;
 20 * that may seem racy, but it is harmless in the context that it is used.
 21 * The inode cannot go inactive as long a reference is kept, and
 22 * therefore if dquot(s) were attached, they'll stay consistent.
 23 * If, for example, the ownership of the inode changes while
 24 * we didn't have the inode locked, the appropriate dquot(s) will be
 25 * attached atomically.
 26 */
 27#define XFS_NOT_DQATTACHED(mp, ip) \
 28	((XFS_IS_UQUOTA_ON(mp) && (ip)->i_udquot == NULL) || \
 29	 (XFS_IS_GQUOTA_ON(mp) && (ip)->i_gdquot == NULL) || \
 30	 (XFS_IS_PQUOTA_ON(mp) && (ip)->i_pdquot == NULL))
 31
 32#define XFS_QM_NEED_QUOTACHECK(mp) \
 33	((XFS_IS_UQUOTA_ON(mp) && \
 34		(mp->m_sb.sb_qflags & XFS_UQUOTA_CHKD) == 0) || \
 35	 (XFS_IS_GQUOTA_ON(mp) && \
 36		(mp->m_sb.sb_qflags & XFS_GQUOTA_CHKD) == 0) || \
 37	 (XFS_IS_PQUOTA_ON(mp) && \
 38		(mp->m_sb.sb_qflags & XFS_PQUOTA_CHKD) == 0))
 39
 40static inline uint
 41xfs_quota_chkd_flag(
 42	xfs_dqtype_t		type)
 43{
 44	switch (type) {
 45	case XFS_DQTYPE_USER:
 46		return XFS_UQUOTA_CHKD;
 47	case XFS_DQTYPE_GROUP:
 48		return XFS_GQUOTA_CHKD;
 49	case XFS_DQTYPE_PROJ:
 50		return XFS_PQUOTA_CHKD;
 51	default:
 52		return 0;
 53	}
 54}
 55
 56/*
 57 * The structure kept inside the xfs_trans_t keep track of dquot changes
 58 * within a transaction and apply them later.
 59 */
 60struct xfs_dqtrx {
 61	struct xfs_dquot *qt_dquot;	  /* the dquot this refers to */
 62
 63	uint64_t	qt_blk_res;	  /* blks reserved on a dquot */
 64	int64_t		qt_bcount_delta;  /* dquot blk count changes */
 65	int64_t		qt_delbcnt_delta; /* delayed dquot blk count changes */
 66
 67	uint64_t	qt_rtblk_res;	  /* # blks reserved on a dquot */
 68	uint64_t	qt_rtblk_res_used;/* # blks used from reservation */
 69	int64_t		qt_rtbcount_delta;/* dquot realtime blk changes */
 70	int64_t		qt_delrtb_delta;  /* delayed RT blk count changes */
 71
 72	uint64_t	qt_ino_res;	  /* inode reserved on a dquot */
 73	uint64_t	qt_ino_res_used;  /* inodes used from the reservation */
 74	int64_t		qt_icount_delta;  /* dquot inode count changes */
 75};
 76
 77enum xfs_apply_dqtrx_type {
 78	XFS_APPLY_DQTRX_COMMIT = 0,
 79	XFS_APPLY_DQTRX_UNRESERVE,
 80};
 81
 82/*
 83 * Parameters for applying dqtrx changes to a dquot.  The hook function arg
 84 * parameter is enum xfs_apply_dqtrx_type.
 85 */
 86struct xfs_apply_dqtrx_params {
 87	uintptr_t		tx_id;
 88	xfs_ino_t		ino;
 89	xfs_dqtype_t		q_type;
 90	xfs_dqid_t		q_id;
 91};
 92
 93#ifdef CONFIG_XFS_QUOTA
 94extern void xfs_trans_dup_dqinfo(struct xfs_trans *, struct xfs_trans *);
 95extern void xfs_trans_free_dqinfo(struct xfs_trans *);
 96extern void xfs_trans_mod_dquot_byino(struct xfs_trans *, struct xfs_inode *,
 97		uint, int64_t);
 98extern void xfs_trans_apply_dquot_deltas(struct xfs_trans *);
 99void xfs_trans_unreserve_and_mod_dquots(struct xfs_trans *tp,
100		bool already_locked);
101int xfs_trans_reserve_quota_nblks(struct xfs_trans *tp, struct xfs_inode *ip,
102		int64_t dblocks, int64_t rblocks, bool force);
103extern int xfs_trans_reserve_quota_bydquots(struct xfs_trans *,
104		struct xfs_mount *, struct xfs_dquot *,
105		struct xfs_dquot *, struct xfs_dquot *, int64_t, long, uint);
106int xfs_trans_reserve_quota_icreate(struct xfs_trans *tp,
107		struct xfs_dquot *udqp, struct xfs_dquot *gdqp,
108		struct xfs_dquot *pdqp, int64_t dblocks);
109
110extern int xfs_qm_vop_dqalloc(struct xfs_inode *, kuid_t, kgid_t,
111		prid_t, uint, struct xfs_dquot **, struct xfs_dquot **,
112		struct xfs_dquot **);
113extern void xfs_qm_vop_create_dqattach(struct xfs_trans *, struct xfs_inode *,
114		struct xfs_dquot *, struct xfs_dquot *, struct xfs_dquot *);
115extern int xfs_qm_vop_rename_dqattach(struct xfs_inode **);
116extern struct xfs_dquot *xfs_qm_vop_chown(struct xfs_trans *,
117		struct xfs_inode *, struct xfs_dquot **, struct xfs_dquot *);
118extern int xfs_qm_dqattach(struct xfs_inode *);
119extern int xfs_qm_dqattach_locked(struct xfs_inode *ip, bool doalloc);
120extern void xfs_qm_dqdetach(struct xfs_inode *);
121extern void xfs_qm_dqrele(struct xfs_dquot *);
122extern void xfs_qm_statvfs(struct xfs_inode *, struct kstatfs *);
123extern int xfs_qm_newmount(struct xfs_mount *, uint *, uint *);
124void xfs_qm_resume_quotaon(struct xfs_mount *mp);
125extern void xfs_qm_mount_quotas(struct xfs_mount *);
126extern void xfs_qm_unmount(struct xfs_mount *);
127extern void xfs_qm_unmount_quotas(struct xfs_mount *);
128bool xfs_inode_near_dquot_enforcement(struct xfs_inode *ip, xfs_dqtype_t type);
129int xfs_quota_reserve_blkres(struct xfs_inode *ip, int64_t blocks);
130
131# ifdef CONFIG_XFS_LIVE_HOOKS
132void xfs_trans_mod_ino_dquot(struct xfs_trans *tp, struct xfs_inode *ip,
133		struct xfs_dquot *dqp, unsigned int field, int64_t delta);
134
135struct xfs_quotainfo;
136
137struct xfs_dqtrx_hook {
138	struct xfs_hook		mod_hook;
139	struct xfs_hook		apply_hook;
140};
141
142void xfs_dqtrx_hook_disable(void);
143void xfs_dqtrx_hook_enable(void);
144
145int xfs_dqtrx_hook_add(struct xfs_quotainfo *qi, struct xfs_dqtrx_hook *hook);
146void xfs_dqtrx_hook_del(struct xfs_quotainfo *qi, struct xfs_dqtrx_hook *hook);
147void xfs_dqtrx_hook_setup(struct xfs_dqtrx_hook *hook, notifier_fn_t mod_fn,
148		notifier_fn_t apply_fn);
149# else
150#  define xfs_trans_mod_ino_dquot(tp, ip, dqp, field, delta) \
151		xfs_trans_mod_dquot((tp), (dqp), (field), (delta))
152# endif /* CONFIG_XFS_LIVE_HOOKS */
153
154#else
155static inline int
156xfs_qm_vop_dqalloc(struct xfs_inode *ip, kuid_t kuid, kgid_t kgid,
157		prid_t prid, uint flags, struct xfs_dquot **udqp,
158		struct xfs_dquot **gdqp, struct xfs_dquot **pdqp)
159{
160	*udqp = NULL;
161	*gdqp = NULL;
162	*pdqp = NULL;
163	return 0;
164}
165#define xfs_trans_dup_dqinfo(tp, tp2)
166#define xfs_trans_free_dqinfo(tp)
167static inline void xfs_trans_mod_dquot_byino(struct xfs_trans *tp,
168		struct xfs_inode *ip, uint field, int64_t delta)
169{
170}
171#define xfs_trans_apply_dquot_deltas(tp)
172#define xfs_trans_unreserve_and_mod_dquots(tp, a)
173static inline int xfs_trans_reserve_quota_nblks(struct xfs_trans *tp,
174		struct xfs_inode *ip, int64_t dblocks, int64_t rblocks,
175		bool force)
176{
177	return 0;
178}
179static inline int xfs_trans_reserve_quota_bydquots(struct xfs_trans *tp,
180		struct xfs_mount *mp, struct xfs_dquot *udqp,
181		struct xfs_dquot *gdqp, struct xfs_dquot *pdqp,
182		int64_t nblks, long nions, uint flags)
183{
184	return 0;
185}
186
187static inline int
188xfs_trans_reserve_quota_icreate(struct xfs_trans *tp, struct xfs_dquot *udqp,
189		struct xfs_dquot *gdqp, struct xfs_dquot *pdqp, int64_t dblocks)
190{
191	return 0;
192}
193
194#define xfs_qm_vop_create_dqattach(tp, ip, u, g, p)
195#define xfs_qm_vop_rename_dqattach(it)					(0)
196#define xfs_qm_vop_chown(tp, ip, old, new)				(NULL)
197#define xfs_qm_dqattach(ip)						(0)
198#define xfs_qm_dqattach_locked(ip, fl)					(0)
199#define xfs_qm_dqdetach(ip)
200#define xfs_qm_dqrele(d)			do { (d) = (d); } while(0)
201#define xfs_qm_statvfs(ip, s)			do { } while(0)
202#define xfs_qm_newmount(mp, a, b)					(0)
203#define xfs_qm_resume_quotaon(mp)		((void)0)
204#define xfs_qm_mount_quotas(mp)
205#define xfs_qm_unmount(mp)
206#define xfs_qm_unmount_quotas(mp)
207#define xfs_inode_near_dquot_enforcement(ip, type)			(false)
208
209static inline int xfs_quota_reserve_blkres(struct xfs_inode *ip, int64_t blocks)
210{
211	return 0;
212}
213
214# ifdef CONFIG_XFS_LIVE_HOOKS
215#  define xfs_dqtrx_hook_enable()		((void)0)
216#  define xfs_dqtrx_hook_disable()		((void)0)
217# endif /* CONFIG_XFS_LIVE_HOOKS */
218
219#endif /* CONFIG_XFS_QUOTA */
220
221static inline void
222xfs_quota_unreserve_blkres(struct xfs_inode *ip, uint64_t blocks)
223{
224	/* don't return an error as unreserving quotas can't fail */
225	xfs_quota_reserve_blkres(ip, -(int64_t)blocks);
226}
227
228extern int xfs_mount_reset_sbqflags(struct xfs_mount *);
229
230#endif	/* __XFS_QUOTA_H__ */