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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 | ||
1da177e4 LT |
32 | struct xfs_mount; |
33 | struct xfs_trans; | |
34 | ||
1da177e4 LT |
35 | /* |
36 | * The incore dquot structure | |
37 | */ | |
38 | typedef struct xfs_dquot { | |
74457cf4 | 39 | uint dq_flags; /* various flags (XFS_DQ_*) */ |
f8739c3c | 40 | struct list_head q_lru; /* global free list of dquots */ |
1da177e4 LT |
41 | struct xfs_mount*q_mount; /* filesystem this relates to */ |
42 | struct xfs_trans*q_transp; /* trans this belongs to currently */ | |
43 | uint q_nrefs; /* # active refs from inodes */ | |
44 | xfs_daddr_t q_blkno; /* blkno of dquot buffer */ | |
45 | int q_bufoffset; /* off of dq in buffer (# dquots) */ | |
46 | xfs_fileoff_t q_fileoffset; /* offset in quotas file */ | |
47 | ||
48 | struct xfs_dquot*q_gdquot; /* group dquot, hint only */ | |
49 | xfs_disk_dquot_t q_core; /* actual usage & quotas */ | |
50 | xfs_dq_logitem_t q_logitem; /* dquot log item */ | |
51 | xfs_qcnt_t q_res_bcount; /* total regular nblks used+reserved */ | |
52 | xfs_qcnt_t q_res_icount; /* total inos allocd+reserved */ | |
53 | xfs_qcnt_t q_res_rtbcount;/* total realtime blks used+reserved */ | |
a0b0b8a5 | 54 | struct mutex q_qlock; /* quota lock */ |
e1f49cf2 | 55 | struct completion q_flush; /* flush completion queue */ |
bc3048e3 PL |
56 | atomic_t q_pincount; /* dquot pin count */ |
57 | wait_queue_head_t q_pinwait; /* dquot pinning wait queue */ | |
1da177e4 LT |
58 | } xfs_dquot_t; |
59 | ||
5bb87a33 | 60 | /* |
af901ca1 | 61 | * Lock hierarchy for q_qlock: |
5bb87a33 CH |
62 | * XFS_QLOCK_NORMAL is the implicit default, |
63 | * XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2 | |
64 | */ | |
65 | enum { | |
66 | XFS_QLOCK_NORMAL = 0, | |
67 | XFS_QLOCK_NESTED, | |
68 | }; | |
69 | ||
1da177e4 | 70 | /* |
e1f49cf2 DC |
71 | * Manage the q_flush completion queue embedded in the dquot. This completion |
72 | * queue synchronizes processes attempting to flush the in-core dquot back to | |
73 | * disk. | |
1da177e4 | 74 | */ |
e1f49cf2 DC |
75 | static inline void xfs_dqflock(xfs_dquot_t *dqp) |
76 | { | |
77 | wait_for_completion(&dqp->q_flush); | |
78 | } | |
79 | ||
80 | static inline int xfs_dqflock_nowait(xfs_dquot_t *dqp) | |
81 | { | |
82 | return try_wait_for_completion(&dqp->q_flush); | |
83 | } | |
84 | ||
85 | static inline void xfs_dqfunlock(xfs_dquot_t *dqp) | |
86 | { | |
87 | complete(&dqp->q_flush); | |
88 | } | |
1da177e4 | 89 | |
800b484e CH |
90 | static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp) |
91 | { | |
92 | return mutex_trylock(&dqp->q_qlock); | |
93 | } | |
94 | ||
95 | static inline void xfs_dqlock(struct xfs_dquot *dqp) | |
96 | { | |
97 | mutex_lock(&dqp->q_qlock); | |
98 | } | |
99 | ||
5b03ff1b | 100 | static inline void xfs_dqunlock(struct xfs_dquot *dqp) |
800b484e CH |
101 | { |
102 | mutex_unlock(&dqp->q_qlock); | |
103 | } | |
104 | ||
6967b964 CS |
105 | static inline int xfs_this_quota_on(struct xfs_mount *mp, int type) |
106 | { | |
107 | switch (type & XFS_DQ_ALLTYPES) { | |
108 | case XFS_DQ_USER: | |
109 | return XFS_IS_UQUOTA_ON(mp); | |
110 | case XFS_DQ_GROUP: | |
111 | case XFS_DQ_PROJ: | |
112 | return XFS_IS_OQUOTA_ON(mp); | |
113 | default: | |
114 | return 0; | |
115 | } | |
116 | } | |
117 | ||
36731410 CS |
118 | static inline xfs_dquot_t *xfs_inode_dquot(struct xfs_inode *ip, int type) |
119 | { | |
120 | switch (type & XFS_DQ_ALLTYPES) { | |
121 | case XFS_DQ_USER: | |
122 | return ip->i_udquot; | |
123 | case XFS_DQ_GROUP: | |
124 | case XFS_DQ_PROJ: | |
125 | return ip->i_gdquot; | |
126 | default: | |
127 | return NULL; | |
128 | } | |
129 | } | |
130 | ||
7201813b | 131 | #define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock))) |
1da177e4 LT |
132 | #define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY) |
133 | #define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER) | |
c8ad20ff NS |
134 | #define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ) |
135 | #define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP) | |
1da177e4 LT |
136 | #define XFS_DQ_TO_QINF(dqp) ((dqp)->q_mount->m_quotainfo) |
137 | #define XFS_DQ_TO_QIP(dqp) (XFS_QM_ISUDQ(dqp) ? \ | |
138 | XFS_DQ_TO_QINF(dqp)->qi_uquotaip : \ | |
139 | XFS_DQ_TO_QINF(dqp)->qi_gquotaip) | |
140 | ||
7ae44407 CH |
141 | extern int xfs_qm_dqread(struct xfs_mount *, xfs_dqid_t, uint, |
142 | uint, struct xfs_dquot **); | |
1da177e4 LT |
143 | extern void xfs_qm_dqdestroy(xfs_dquot_t *); |
144 | extern int xfs_qm_dqflush(xfs_dquot_t *, uint); | |
1da177e4 | 145 | extern void xfs_qm_dqunpin_wait(xfs_dquot_t *); |
1da177e4 LT |
146 | extern void xfs_qm_adjust_dqtimers(xfs_mount_t *, |
147 | xfs_disk_dquot_t *); | |
148 | extern void xfs_qm_adjust_dqlimits(xfs_mount_t *, | |
149 | xfs_disk_dquot_t *); | |
1da177e4 LT |
150 | extern int xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *, |
151 | xfs_dqid_t, uint, uint, xfs_dquot_t **); | |
152 | extern void xfs_qm_dqput(xfs_dquot_t *); | |
800b484e CH |
153 | |
154 | extern void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *); | |
800b484e | 155 | extern void xfs_dqflock_pushbuf_wait(struct xfs_dquot *dqp); |
1da177e4 | 156 | |
78e55892 CH |
157 | static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp) |
158 | { | |
159 | xfs_dqlock(dqp); | |
160 | dqp->q_nrefs++; | |
161 | xfs_dqunlock(dqp); | |
162 | return dqp; | |
163 | } | |
164 | ||
1da177e4 | 165 | #endif /* __XFS_DQUOT_H__ */ |