Line data Source code
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 : struct xfs_dquot_res {
31 : /* Total resources allocated and reserved. */
32 : xfs_qcnt_t reserved;
33 :
34 : /* Total resources allocated. */
35 : xfs_qcnt_t count;
36 :
37 : /* Absolute and preferred limits. */
38 : xfs_qcnt_t hardlimit;
39 : xfs_qcnt_t softlimit;
40 :
41 : /*
42 : * For root dquots, this is the default grace period, in seconds.
43 : * Otherwise, this is when the quota grace period expires,
44 : * in seconds since the Unix epoch.
45 : */
46 : time64_t timer;
47 : };
48 :
49 : static inline bool
50 98001983 : xfs_dquot_res_over_limits(
51 : const struct xfs_dquot_res *qres)
52 : {
53 98001983 : if ((qres->softlimit && qres->softlimit < qres->reserved) ||
54 98001839 : (qres->hardlimit && qres->hardlimit < qres->reserved))
55 144 : return true;
56 : return false;
57 : }
58 :
59 : /*
60 : * The incore dquot structure
61 : */
62 : struct xfs_dquot {
63 : struct list_head q_lru;
64 : struct xfs_mount *q_mount;
65 : xfs_dqtype_t q_type;
66 : uint16_t q_flags;
67 : xfs_dqid_t q_id;
68 : uint q_nrefs;
69 : int q_bufoffset;
70 : xfs_daddr_t q_blkno;
71 : xfs_fileoff_t q_fileoffset;
72 :
73 : struct xfs_dquot_res q_blk; /* regular blocks */
74 : struct xfs_dquot_res q_ino; /* inodes */
75 : struct xfs_dquot_res q_rtb; /* realtime blocks */
76 :
77 : struct xfs_dq_logitem q_logitem;
78 :
79 : xfs_qcnt_t q_prealloc_lo_wmark;
80 : xfs_qcnt_t q_prealloc_hi_wmark;
81 : int64_t q_low_space[XFS_QLOWSP_MAX];
82 : struct mutex q_qlock;
83 : struct completion q_flush;
84 : atomic_t q_pincount;
85 : struct wait_queue_head q_pinwait;
86 : };
87 :
88 : /*
89 : * Lock hierarchy for q_qlock:
90 : * XFS_QLOCK_NORMAL is the implicit default,
91 : * XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
92 : */
93 : enum {
94 : XFS_QLOCK_NORMAL = 0,
95 : XFS_QLOCK_NESTED,
96 : };
97 :
98 : /*
99 : * Manage the q_flush completion queue embedded in the dquot. This completion
100 : * queue synchronizes processes attempting to flush the in-core dquot back to
101 : * disk.
102 : */
103 : static inline void xfs_dqflock(struct xfs_dquot *dqp)
104 : {
105 6912935 : wait_for_completion(&dqp->q_flush);
106 : }
107 :
108 : static inline bool xfs_dqflock_nowait(struct xfs_dquot *dqp)
109 : {
110 13662326 : return try_wait_for_completion(&dqp->q_flush);
111 : }
112 :
113 : static inline void xfs_dqfunlock(struct xfs_dquot *dqp)
114 : {
115 19005971 : complete(&dqp->q_flush);
116 : }
117 :
118 : static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp)
119 : {
120 14829134 : return mutex_trylock(&dqp->q_qlock);
121 : }
122 :
123 : static inline void xfs_dqlock(struct xfs_dquot *dqp)
124 : {
125 4300616895 : mutex_lock(&dqp->q_qlock);
126 : }
127 :
128 : static inline void xfs_dqunlock(struct xfs_dquot *dqp)
129 : {
130 4332021145 : mutex_unlock(&dqp->q_qlock);
131 306680810 : }
132 :
133 : static inline int
134 : xfs_dquot_type(const struct xfs_dquot *dqp)
135 : {
136 3675889940 : return dqp->q_type & XFS_DQTYPE_REC_MASK;
137 : }
138 :
139 14796806 : static inline int xfs_this_quota_on(struct xfs_mount *mp, xfs_dqtype_t type)
140 : {
141 14796806 : switch (type) {
142 7027531 : case XFS_DQTYPE_USER:
143 7027531 : return XFS_IS_UQUOTA_ON(mp);
144 6748553 : case XFS_DQTYPE_GROUP:
145 6748553 : return XFS_IS_GQUOTA_ON(mp);
146 1020722 : case XFS_DQTYPE_PROJ:
147 1020722 : return XFS_IS_PQUOTA_ON(mp);
148 : default:
149 : return 0;
150 : }
151 : }
152 :
153 : static inline struct xfs_dquot *xfs_inode_dquot(
154 : struct xfs_inode *ip,
155 : xfs_dqtype_t type)
156 : {
157 134012536 : switch (type) {
158 44970884 : case XFS_DQTYPE_USER:
159 44975163 : return ip->i_udquot;
160 44965949 : case XFS_DQTYPE_GROUP:
161 44970228 : return ip->i_gdquot;
162 44071424 : case XFS_DQTYPE_PROJ:
163 44075703 : return ip->i_pdquot;
164 : default:
165 : return NULL;
166 : }
167 : }
168 :
169 : /* Decide if the dquot's limits are actually being enforced. */
170 : static inline bool
171 202296546 : xfs_dquot_is_enforced(
172 : const struct xfs_dquot *dqp)
173 : {
174 202296546 : switch (xfs_dquot_type(dqp)) {
175 81126157 : case XFS_DQTYPE_USER:
176 81126157 : return XFS_IS_UQUOTA_ENFORCED(dqp->q_mount);
177 81047841 : case XFS_DQTYPE_GROUP:
178 81047841 : return XFS_IS_GQUOTA_ENFORCED(dqp->q_mount);
179 40122548 : case XFS_DQTYPE_PROJ:
180 40122548 : return XFS_IS_PQUOTA_ENFORCED(dqp->q_mount);
181 : }
182 0 : ASSERT(0);
183 0 : return false;
184 : }
185 :
186 : /*
187 : * Check whether a dquot is under low free space conditions. We assume the quota
188 : * is enabled and enforced.
189 : */
190 : static inline bool xfs_dquot_lowsp(struct xfs_dquot *dqp)
191 : {
192 19212 : int64_t freesp;
193 :
194 19212 : freesp = dqp->q_blk.hardlimit - dqp->q_blk.reserved;
195 19212 : if (freesp < dqp->q_low_space[XFS_QLOWSP_1_PCNT])
196 17992 : return true;
197 :
198 : return false;
199 : }
200 :
201 : void xfs_dquot_to_disk(struct xfs_disk_dquot *ddqp, struct xfs_dquot *dqp);
202 :
203 : #define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock)))
204 : #define XFS_DQ_IS_DIRTY(dqp) ((dqp)->q_flags & XFS_DQFLAG_DIRTY)
205 :
206 : void xfs_qm_dqdestroy(struct xfs_dquot *dqp);
207 : int xfs_qm_dqflush(struct xfs_dquot *dqp, struct xfs_buf **bpp);
208 : void xfs_qm_dqunpin_wait(struct xfs_dquot *dqp);
209 : void xfs_qm_adjust_dqtimers(struct xfs_dquot *d);
210 : void xfs_qm_adjust_dqlimits(struct xfs_dquot *d);
211 : xfs_dqid_t xfs_qm_id_for_quotatype(struct xfs_inode *ip,
212 : xfs_dqtype_t type);
213 : int xfs_qm_dqget(struct xfs_mount *mp, xfs_dqid_t id,
214 : xfs_dqtype_t type, bool can_alloc,
215 : struct xfs_dquot **dqpp);
216 : int xfs_qm_dqget_inode(struct xfs_inode *ip, xfs_dqtype_t type,
217 : bool can_alloc, struct xfs_dquot **dqpp);
218 : int xfs_qm_dqget_next(struct xfs_mount *mp, xfs_dqid_t id,
219 : xfs_dqtype_t type, struct xfs_dquot **dqpp);
220 : int xfs_qm_dqget_uncached(struct xfs_mount *mp,
221 : xfs_dqid_t id, xfs_dqtype_t type,
222 : struct xfs_dquot **dqpp);
223 : void xfs_qm_dqput(struct xfs_dquot *dqp);
224 :
225 : void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
226 :
227 : void xfs_dquot_set_prealloc_limits(struct xfs_dquot *);
228 :
229 186161382 : static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp)
230 : {
231 186161382 : xfs_dqlock(dqp);
232 186189277 : dqp->q_nrefs++;
233 186189277 : xfs_dqunlock(dqp);
234 186172403 : return dqp;
235 : }
236 :
237 : typedef int (*xfs_qm_dqiterate_fn)(struct xfs_dquot *dq,
238 : xfs_dqtype_t type, void *priv);
239 : int xfs_qm_dqiterate(struct xfs_mount *mp, xfs_dqtype_t type,
240 : xfs_qm_dqiterate_fn iter_fn, void *priv);
241 :
242 : time64_t xfs_dquot_set_timeout(struct xfs_mount *mp, time64_t timeout);
243 : time64_t xfs_dquot_set_grace_period(time64_t grace);
244 :
245 : #endif /* __XFS_DQUOT_H__ */
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