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1da177e4 | 1 | /* |
4ce3121f NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
4ce3121f NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
4ce3121f NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
4ce3121f NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 LT |
17 | */ |
18 | #ifndef __XFS_DQUOT_H__ | |
19 | #define __XFS_DQUOT_H__ | |
20 | ||
21 | /* | |
22 | * Dquots are structures that hold quota information about a user or a group, | |
23 | * much like inodes are for files. In fact, dquots share many characteristics | |
24 | * with inodes. However, dquots can also be a centralized resource, relative | |
25 | * to a collection of inodes. In this respect, dquots share some characteristics | |
26 | * of the superblock. | |
27 | * XFS dquots exploit both those in its algorithms. They make every attempt | |
28 | * to not be a bottleneck when quotas are on and have minimal impact, if any, | |
29 | * when quotas are off. | |
30 | */ | |
31 | ||
32 | /* | |
33 | * The hash chain headers (hash buckets) | |
34 | */ | |
35 | typedef struct xfs_dqhash { | |
36 | struct xfs_dquot *qh_next; | |
37 | mutex_t qh_lock; | |
38 | uint qh_version; /* ever increasing version */ | |
39 | uint qh_nelems; /* number of dquots on the list */ | |
40 | } xfs_dqhash_t; | |
41 | ||
42 | typedef struct xfs_dqlink { | |
43 | struct xfs_dquot *ql_next; /* forward link */ | |
44 | struct xfs_dquot **ql_prevp; /* pointer to prev ql_next */ | |
45 | } xfs_dqlink_t; | |
46 | ||
47 | struct xfs_mount; | |
48 | struct xfs_trans; | |
49 | ||
50 | /* | |
51 | * This is the marker which is designed to occupy the first few | |
52 | * bytes of the xfs_dquot_t structure. Even inside this, the freelist pointers | |
53 | * must come first. | |
54 | * This serves as the marker ("sentinel") when we have to restart list | |
55 | * iterations because of locking considerations. | |
56 | */ | |
57 | typedef struct xfs_dqmarker { | |
58 | struct xfs_dquot*dqm_flnext; /* link to freelist: must be first */ | |
59 | struct xfs_dquot*dqm_flprev; | |
60 | xfs_dqlink_t dqm_mplist; /* link to mount's list of dquots */ | |
61 | xfs_dqlink_t dqm_hashlist; /* link to the hash chain */ | |
62 | uint dqm_flags; /* various flags (XFS_DQ_*) */ | |
63 | } xfs_dqmarker_t; | |
64 | ||
65 | /* | |
66 | * The incore dquot structure | |
67 | */ | |
68 | typedef struct xfs_dquot { | |
69 | xfs_dqmarker_t q_lists; /* list ptrs, q_flags (marker) */ | |
70 | xfs_dqhash_t *q_hash; /* the hashchain header */ | |
71 | struct xfs_mount*q_mount; /* filesystem this relates to */ | |
72 | struct xfs_trans*q_transp; /* trans this belongs to currently */ | |
73 | uint q_nrefs; /* # active refs from inodes */ | |
74 | xfs_daddr_t q_blkno; /* blkno of dquot buffer */ | |
75 | int q_bufoffset; /* off of dq in buffer (# dquots) */ | |
76 | xfs_fileoff_t q_fileoffset; /* offset in quotas file */ | |
77 | ||
78 | struct xfs_dquot*q_gdquot; /* group dquot, hint only */ | |
79 | xfs_disk_dquot_t q_core; /* actual usage & quotas */ | |
80 | xfs_dq_logitem_t q_logitem; /* dquot log item */ | |
81 | xfs_qcnt_t q_res_bcount; /* total regular nblks used+reserved */ | |
82 | xfs_qcnt_t q_res_icount; /* total inos allocd+reserved */ | |
83 | xfs_qcnt_t q_res_rtbcount;/* total realtime blks used+reserved */ | |
84 | mutex_t q_qlock; /* quota lock */ | |
e1f49cf2 | 85 | struct completion q_flush; /* flush completion queue */ |
bc3048e3 PL |
86 | atomic_t q_pincount; /* dquot pin count */ |
87 | wait_queue_head_t q_pinwait; /* dquot pinning wait queue */ | |
1da177e4 LT |
88 | #ifdef XFS_DQUOT_TRACE |
89 | struct ktrace *q_trace; /* trace header structure */ | |
90 | #endif | |
91 | } xfs_dquot_t; | |
92 | ||
93 | ||
94 | #define dq_flnext q_lists.dqm_flnext | |
95 | #define dq_flprev q_lists.dqm_flprev | |
96 | #define dq_mplist q_lists.dqm_mplist | |
97 | #define dq_hashlist q_lists.dqm_hashlist | |
98 | #define dq_flags q_lists.dqm_flags | |
99 | ||
100 | #define XFS_DQHOLD(dqp) ((dqp)->q_nrefs++) | |
101 | ||
1da177e4 LT |
102 | #ifdef DEBUG |
103 | static inline int | |
104 | XFS_DQ_IS_LOCKED(xfs_dquot_t *dqp) | |
105 | { | |
106 | if (mutex_trylock(&dqp->q_qlock)) { | |
107 | mutex_unlock(&dqp->q_qlock); | |
108 | return 0; | |
109 | } | |
110 | return 1; | |
111 | } | |
112 | #endif | |
113 | ||
114 | ||
115 | /* | |
e1f49cf2 DC |
116 | * Manage the q_flush completion queue embedded in the dquot. This completion |
117 | * queue synchronizes processes attempting to flush the in-core dquot back to | |
118 | * disk. | |
1da177e4 | 119 | */ |
e1f49cf2 DC |
120 | static inline void xfs_dqflock(xfs_dquot_t *dqp) |
121 | { | |
122 | wait_for_completion(&dqp->q_flush); | |
123 | } | |
124 | ||
125 | static inline int xfs_dqflock_nowait(xfs_dquot_t *dqp) | |
126 | { | |
127 | return try_wait_for_completion(&dqp->q_flush); | |
128 | } | |
129 | ||
130 | static inline void xfs_dqfunlock(xfs_dquot_t *dqp) | |
131 | { | |
132 | complete(&dqp->q_flush); | |
133 | } | |
1da177e4 | 134 | |
1da177e4 LT |
135 | #define XFS_DQ_IS_ON_FREELIST(dqp) ((dqp)->dq_flnext != (dqp)) |
136 | #define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY) | |
137 | #define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER) | |
c8ad20ff NS |
138 | #define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ) |
139 | #define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP) | |
1da177e4 LT |
140 | #define XFS_DQ_TO_QINF(dqp) ((dqp)->q_mount->m_quotainfo) |
141 | #define XFS_DQ_TO_QIP(dqp) (XFS_QM_ISUDQ(dqp) ? \ | |
142 | XFS_DQ_TO_QINF(dqp)->qi_uquotaip : \ | |
143 | XFS_DQ_TO_QINF(dqp)->qi_gquotaip) | |
144 | ||
145 | #define XFS_IS_THIS_QUOTA_OFF(d) (! (XFS_QM_ISUDQ(d) ? \ | |
146 | (XFS_IS_UQUOTA_ON((d)->q_mount)) : \ | |
c8ad20ff | 147 | (XFS_IS_OQUOTA_ON((d)->q_mount)))) |
1da177e4 LT |
148 | |
149 | #ifdef XFS_DQUOT_TRACE | |
150 | /* | |
151 | * Dquot Tracing stuff. | |
152 | */ | |
153 | #define DQUOT_TRACE_SIZE 64 | |
154 | #define DQUOT_KTRACE_ENTRY 1 | |
155 | ||
156 | extern void __xfs_dqtrace_entry(xfs_dquot_t *dqp, char *func, | |
157 | void *, xfs_inode_t *); | |
158 | #define xfs_dqtrace_entry_ino(a,b,ip) \ | |
159 | __xfs_dqtrace_entry((a), (b), (void*)__return_address, (ip)) | |
160 | #define xfs_dqtrace_entry(a,b) \ | |
161 | __xfs_dqtrace_entry((a), (b), (void*)__return_address, NULL) | |
162 | #else | |
163 | #define xfs_dqtrace_entry(a,b) | |
164 | #define xfs_dqtrace_entry_ino(a,b,ip) | |
165 | #endif | |
166 | ||
167 | #ifdef QUOTADEBUG | |
168 | extern void xfs_qm_dqprint(xfs_dquot_t *); | |
169 | #else | |
170 | #define xfs_qm_dqprint(a) | |
171 | #endif | |
172 | ||
173 | extern void xfs_qm_dqdestroy(xfs_dquot_t *); | |
174 | extern int xfs_qm_dqflush(xfs_dquot_t *, uint); | |
4f0e8a98 | 175 | extern int xfs_qm_dqpurge(xfs_dquot_t *); |
1da177e4 LT |
176 | extern void xfs_qm_dqunpin_wait(xfs_dquot_t *); |
177 | extern int xfs_qm_dqlock_nowait(xfs_dquot_t *); | |
1da177e4 LT |
178 | extern void xfs_qm_dqflock_pushbuf_wait(xfs_dquot_t *dqp); |
179 | extern void xfs_qm_adjust_dqtimers(xfs_mount_t *, | |
180 | xfs_disk_dquot_t *); | |
181 | extern void xfs_qm_adjust_dqlimits(xfs_mount_t *, | |
182 | xfs_disk_dquot_t *); | |
1da177e4 LT |
183 | extern int xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *, |
184 | xfs_dqid_t, uint, uint, xfs_dquot_t **); | |
185 | extern void xfs_qm_dqput(xfs_dquot_t *); | |
186 | extern void xfs_qm_dqrele(xfs_dquot_t *); | |
187 | extern void xfs_dqlock(xfs_dquot_t *); | |
188 | extern void xfs_dqlock2(xfs_dquot_t *, xfs_dquot_t *); | |
189 | extern void xfs_dqunlock(xfs_dquot_t *); | |
190 | extern void xfs_dqunlock_nonotify(xfs_dquot_t *); | |
191 | ||
192 | #endif /* __XFS_DQUOT_H__ */ |