xref: /linux/fs/xfs/xfs_quota.h (revision b477ff98d903618a1ab8247861f2ea6e70c0f0f8)
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 
15 struct xfs_trans;
16 struct 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 
40 static inline uint
xfs_quota_chkd_flag(xfs_dqtype_t type)41 xfs_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  */
60 struct 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 
77 enum 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  */
86 struct 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
94 extern void xfs_trans_dup_dqinfo(struct xfs_trans *, struct xfs_trans *);
95 extern void xfs_trans_free_dqinfo(struct xfs_trans *);
96 extern void xfs_trans_mod_dquot_byino(struct xfs_trans *, struct xfs_inode *,
97 		uint, int64_t);
98 extern void xfs_trans_apply_dquot_deltas(struct xfs_trans *);
99 void xfs_trans_unreserve_and_mod_dquots(struct xfs_trans *tp,
100 		bool already_locked);
101 int xfs_trans_reserve_quota_nblks(struct xfs_trans *tp, struct xfs_inode *ip,
102 		int64_t dblocks, int64_t rblocks, bool force);
103 extern 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);
106 int 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 
110 extern 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 **);
113 extern void xfs_qm_vop_create_dqattach(struct xfs_trans *, struct xfs_inode *,
114 		struct xfs_dquot *, struct xfs_dquot *, struct xfs_dquot *);
115 extern int xfs_qm_vop_rename_dqattach(struct xfs_inode **);
116 extern struct xfs_dquot *xfs_qm_vop_chown(struct xfs_trans *,
117 		struct xfs_inode *, struct xfs_dquot **, struct xfs_dquot *);
118 extern int xfs_qm_dqattach(struct xfs_inode *);
119 extern int xfs_qm_dqattach_locked(struct xfs_inode *ip, bool doalloc);
120 extern void xfs_qm_dqdetach(struct xfs_inode *);
121 extern void xfs_qm_dqrele(struct xfs_dquot *);
122 extern void xfs_qm_statvfs(struct xfs_inode *, struct kstatfs *);
123 extern int xfs_qm_newmount(struct xfs_mount *, uint *, uint *);
124 void xfs_qm_resume_quotaon(struct xfs_mount *mp);
125 extern void xfs_qm_mount_quotas(struct xfs_mount *);
126 extern void xfs_qm_unmount(struct xfs_mount *);
127 extern void xfs_qm_unmount_quotas(struct xfs_mount *);
128 bool xfs_inode_near_dquot_enforcement(struct xfs_inode *ip, xfs_dqtype_t type);
129 int xfs_quota_reserve_blkres(struct xfs_inode *ip, int64_t blocks);
130 
131 # ifdef CONFIG_XFS_LIVE_HOOKS
132 void 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 
135 struct xfs_quotainfo;
136 
137 struct xfs_dqtrx_hook {
138 	struct xfs_hook		mod_hook;
139 	struct xfs_hook		apply_hook;
140 };
141 
142 void xfs_dqtrx_hook_disable(void);
143 void xfs_dqtrx_hook_enable(void);
144 
145 int xfs_dqtrx_hook_add(struct xfs_quotainfo *qi, struct xfs_dqtrx_hook *hook);
146 void xfs_dqtrx_hook_del(struct xfs_quotainfo *qi, struct xfs_dqtrx_hook *hook);
147 void 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
155 static inline int
xfs_qm_vop_dqalloc(struct xfs_inode * ip,kuid_t kuid,kgid_t kgid,prid_t prid,uint flags,struct xfs_dquot ** udqp,struct xfs_dquot ** gdqp,struct xfs_dquot ** pdqp)156 xfs_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)
xfs_trans_mod_dquot_byino(struct xfs_trans * tp,struct xfs_inode * ip,uint field,int64_t delta)167 static 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)
xfs_trans_reserve_quota_nblks(struct xfs_trans * tp,struct xfs_inode * ip,int64_t dblocks,int64_t rblocks,bool force)173 static 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 }
xfs_trans_reserve_quota_bydquots(struct xfs_trans * tp,struct xfs_mount * mp,struct xfs_dquot * udqp,struct xfs_dquot * gdqp,struct xfs_dquot * pdqp,int64_t nblks,long nions,uint flags)179 static 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 
187 static inline int
xfs_trans_reserve_quota_icreate(struct xfs_trans * tp,struct xfs_dquot * udqp,struct xfs_dquot * gdqp,struct xfs_dquot * pdqp,int64_t dblocks)188 xfs_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 
xfs_quota_reserve_blkres(struct xfs_inode * ip,int64_t blocks)209 static 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 
221 static inline void
xfs_quota_unreserve_blkres(struct xfs_inode * ip,uint64_t blocks)222 xfs_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 
228 extern int xfs_mount_reset_sbqflags(struct xfs_mount *);
229 
230 #endif	/* __XFS_QUOTA_H__ */
231