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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 { | |
e6a81f13 | 36 | struct list_head qh_list; |
a0b0b8a5 | 37 | struct mutex qh_lock; |
1da177e4 LT |
38 | uint qh_version; /* ever increasing version */ |
39 | uint qh_nelems; /* number of dquots on the list */ | |
40 | } xfs_dqhash_t; | |
41 | ||
1da177e4 LT |
42 | struct xfs_mount; |
43 | struct xfs_trans; | |
44 | ||
1da177e4 LT |
45 | /* |
46 | * The incore dquot structure | |
47 | */ | |
48 | typedef struct xfs_dquot { | |
74457cf4 | 49 | uint dq_flags; /* various flags (XFS_DQ_*) */ |
3a8406f6 | 50 | struct list_head q_freelist; /* global free list of dquots */ |
3a25404b | 51 | struct list_head q_mplist; /* mount's list of dquots */ |
3a8406f6 | 52 | struct list_head q_hashlist; /* gloabl hash list of dquots */ |
1da177e4 LT |
53 | xfs_dqhash_t *q_hash; /* the hashchain header */ |
54 | struct xfs_mount*q_mount; /* filesystem this relates to */ | |
55 | struct xfs_trans*q_transp; /* trans this belongs to currently */ | |
56 | uint q_nrefs; /* # active refs from inodes */ | |
57 | xfs_daddr_t q_blkno; /* blkno of dquot buffer */ | |
58 | int q_bufoffset; /* off of dq in buffer (# dquots) */ | |
59 | xfs_fileoff_t q_fileoffset; /* offset in quotas file */ | |
60 | ||
61 | struct xfs_dquot*q_gdquot; /* group dquot, hint only */ | |
62 | xfs_disk_dquot_t q_core; /* actual usage & quotas */ | |
63 | xfs_dq_logitem_t q_logitem; /* dquot log item */ | |
64 | xfs_qcnt_t q_res_bcount; /* total regular nblks used+reserved */ | |
65 | xfs_qcnt_t q_res_icount; /* total inos allocd+reserved */ | |
66 | xfs_qcnt_t q_res_rtbcount;/* total realtime blks used+reserved */ | |
a0b0b8a5 | 67 | struct mutex q_qlock; /* quota lock */ |
e1f49cf2 | 68 | struct completion q_flush; /* flush completion queue */ |
bc3048e3 PL |
69 | atomic_t q_pincount; /* dquot pin count */ |
70 | wait_queue_head_t q_pinwait; /* dquot pinning wait queue */ | |
1da177e4 LT |
71 | } xfs_dquot_t; |
72 | ||
5bb87a33 | 73 | /* |
af901ca1 | 74 | * Lock hierarchy for q_qlock: |
5bb87a33 CH |
75 | * XFS_QLOCK_NORMAL is the implicit default, |
76 | * XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2 | |
77 | */ | |
78 | enum { | |
79 | XFS_QLOCK_NORMAL = 0, | |
80 | XFS_QLOCK_NESTED, | |
81 | }; | |
82 | ||
1da177e4 | 83 | /* |
e1f49cf2 DC |
84 | * Manage the q_flush completion queue embedded in the dquot. This completion |
85 | * queue synchronizes processes attempting to flush the in-core dquot back to | |
86 | * disk. | |
1da177e4 | 87 | */ |
e1f49cf2 DC |
88 | static inline void xfs_dqflock(xfs_dquot_t *dqp) |
89 | { | |
90 | wait_for_completion(&dqp->q_flush); | |
91 | } | |
92 | ||
93 | static inline int xfs_dqflock_nowait(xfs_dquot_t *dqp) | |
94 | { | |
95 | return try_wait_for_completion(&dqp->q_flush); | |
96 | } | |
97 | ||
98 | static inline void xfs_dqfunlock(xfs_dquot_t *dqp) | |
99 | { | |
100 | complete(&dqp->q_flush); | |
101 | } | |
1da177e4 | 102 | |
800b484e CH |
103 | static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp) |
104 | { | |
105 | return mutex_trylock(&dqp->q_qlock); | |
106 | } | |
107 | ||
108 | static inline void xfs_dqlock(struct xfs_dquot *dqp) | |
109 | { | |
110 | mutex_lock(&dqp->q_qlock); | |
111 | } | |
112 | ||
5b03ff1b | 113 | static inline void xfs_dqunlock(struct xfs_dquot *dqp) |
800b484e CH |
114 | { |
115 | mutex_unlock(&dqp->q_qlock); | |
116 | } | |
117 | ||
6967b964 CS |
118 | static inline int xfs_this_quota_on(struct xfs_mount *mp, int type) |
119 | { | |
120 | switch (type & XFS_DQ_ALLTYPES) { | |
121 | case XFS_DQ_USER: | |
122 | return XFS_IS_UQUOTA_ON(mp); | |
123 | case XFS_DQ_GROUP: | |
124 | case XFS_DQ_PROJ: | |
125 | return XFS_IS_OQUOTA_ON(mp); | |
126 | default: | |
127 | return 0; | |
128 | } | |
129 | } | |
130 | ||
36731410 CS |
131 | static inline xfs_dquot_t *xfs_inode_dquot(struct xfs_inode *ip, int type) |
132 | { | |
133 | switch (type & XFS_DQ_ALLTYPES) { | |
134 | case XFS_DQ_USER: | |
135 | return ip->i_udquot; | |
136 | case XFS_DQ_GROUP: | |
137 | case XFS_DQ_PROJ: | |
138 | return ip->i_gdquot; | |
139 | default: | |
140 | return NULL; | |
141 | } | |
142 | } | |
143 | ||
7201813b | 144 | #define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock))) |
1da177e4 LT |
145 | #define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY) |
146 | #define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER) | |
c8ad20ff NS |
147 | #define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ) |
148 | #define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP) | |
1da177e4 LT |
149 | #define XFS_DQ_TO_QINF(dqp) ((dqp)->q_mount->m_quotainfo) |
150 | #define XFS_DQ_TO_QIP(dqp) (XFS_QM_ISUDQ(dqp) ? \ | |
151 | XFS_DQ_TO_QINF(dqp)->qi_uquotaip : \ | |
152 | XFS_DQ_TO_QINF(dqp)->qi_gquotaip) | |
153 | ||
7ae44407 CH |
154 | extern int xfs_qm_dqread(struct xfs_mount *, xfs_dqid_t, uint, |
155 | uint, struct xfs_dquot **); | |
1da177e4 LT |
156 | extern void xfs_qm_dqdestroy(xfs_dquot_t *); |
157 | extern int xfs_qm_dqflush(xfs_dquot_t *, uint); | |
92678554 | 158 | extern void xfs_qm_dqpurge(xfs_dquot_t *); |
1da177e4 | 159 | extern void xfs_qm_dqunpin_wait(xfs_dquot_t *); |
1da177e4 LT |
160 | extern void xfs_qm_adjust_dqtimers(xfs_mount_t *, |
161 | xfs_disk_dquot_t *); | |
162 | extern void xfs_qm_adjust_dqlimits(xfs_mount_t *, | |
163 | xfs_disk_dquot_t *); | |
1da177e4 LT |
164 | extern int xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *, |
165 | xfs_dqid_t, uint, uint, xfs_dquot_t **); | |
166 | extern void xfs_qm_dqput(xfs_dquot_t *); | |
800b484e CH |
167 | |
168 | extern void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *); | |
800b484e | 169 | extern void xfs_dqflock_pushbuf_wait(struct xfs_dquot *dqp); |
1da177e4 | 170 | |
78e55892 CH |
171 | static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp) |
172 | { | |
173 | xfs_dqlock(dqp); | |
174 | dqp->q_nrefs++; | |
175 | xfs_dqunlock(dqp); | |
176 | return dqp; | |
177 | } | |
178 | ||
1da177e4 | 179 | #endif /* __XFS_DQUOT_H__ */ |