1 /*
2 * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32 #ifndef __XFS_DQUOT_H__
33 #define __XFS_DQUOT_H__
34
35 /*
36 * Dquots are structures that hold quota information about a user or a group,
37 * much like inodes are for files. In fact, dquots share many characteristics
38 * with inodes. However, dquots can also be a centralized resource, relative
39 * to a collection of inodes. In this respect, dquots share some characteristics
40 * of the superblock.
41 * XFS dquots exploit both those in its algorithms. They make every attempt
42 * to not be a bottleneck when quotas are on and have minimal impact, if any,
43 * when quotas are off.
44 */
45
46 /*
47 * The hash chain headers (hash buckets)
48 */
49 typedef struct xfs_dqhash {
50 struct xfs_dquot *qh_next;
51 mutex_t qh_lock;
52 uint qh_version; /* ever increasing version */
53 uint qh_nelems; /* number of dquots on the list */
54 } xfs_dqhash_t;
55
56 typedef struct xfs_dqlink {
57 struct xfs_dquot *ql_next; /* forward link */
58 struct xfs_dquot **ql_prevp; /* pointer to prev ql_next */
59 } xfs_dqlink_t;
60
61 struct xfs_mount;
62 struct xfs_trans;
63
64 /*
65 * This is the marker which is designed to occupy the first few
66 * bytes of the xfs_dquot_t structure. Even inside this, the freelist pointers
67 * must come first.
68 * This serves as the marker ("sentinel") when we have to restart list
69 * iterations because of locking considerations.
70 */
71 typedef struct xfs_dqmarker {
72 struct xfs_dquot*dqm_flnext; /* link to freelist: must be first */
73 struct xfs_dquot*dqm_flprev;
74 xfs_dqlink_t dqm_mplist; /* link to mount's list of dquots */
75 xfs_dqlink_t dqm_hashlist; /* link to the hash chain */
76 uint dqm_flags; /* various flags (XFS_DQ_*) */
77 } xfs_dqmarker_t;
78
79 /*
80 * The incore dquot structure
81 */
82 typedef struct xfs_dquot {
83 xfs_dqmarker_t q_lists; /* list ptrs, q_flags (marker) */
84 xfs_dqhash_t *q_hash; /* the hashchain header */
85 struct xfs_mount*q_mount; /* filesystem this relates to */
86 struct xfs_trans*q_transp; /* trans this belongs to currently */
87 uint q_nrefs; /* # active refs from inodes */
88 xfs_daddr_t q_blkno; /* blkno of dquot buffer */
89 int q_bufoffset; /* off of dq in buffer (# dquots) */
90 xfs_fileoff_t q_fileoffset; /* offset in quotas file */
91
92 struct xfs_dquot*q_gdquot; /* group dquot, hint only */
93 xfs_disk_dquot_t q_core; /* actual usage & quotas */
94 xfs_dq_logitem_t q_logitem; /* dquot log item */
95 xfs_qcnt_t q_res_bcount; /* total regular nblks used+reserved */
96 xfs_qcnt_t q_res_icount; /* total inos allocd+reserved */
97 xfs_qcnt_t q_res_rtbcount;/* total realtime blks used+reserved */
98 mutex_t q_qlock; /* quota lock */
99 sema_t q_flock; /* flush lock */
100 uint q_pincount; /* pin count for this dquot */
101 sv_t q_pinwait; /* sync var for pinning */
102 #ifdef XFS_DQUOT_TRACE
103 struct ktrace *q_trace; /* trace header structure */
104 #endif
105 } xfs_dquot_t;
106
107
108 #define dq_flnext q_lists.dqm_flnext
109 #define dq_flprev q_lists.dqm_flprev
110 #define dq_mplist q_lists.dqm_mplist
111 #define dq_hashlist q_lists.dqm_hashlist
112 #define dq_flags q_lists.dqm_flags
113
114 #define XFS_DQHOLD(dqp) ((dqp)->q_nrefs++)
115
116 /*
117 * Quota Accounting flags
118 */
119 #define XFS_ALL_QUOTA_ACCT (XFS_UQUOTA_ACCT | XFS_GQUOTA_ACCT)
120 #define XFS_ALL_QUOTA_ENFD (XFS_UQUOTA_ENFD | XFS_GQUOTA_ENFD)
121 #define XFS_ALL_QUOTA_CHKD (XFS_UQUOTA_CHKD | XFS_GQUOTA_CHKD)
122 #define XFS_ALL_QUOTA_ACTV (XFS_UQUOTA_ACTIVE | XFS_GQUOTA_ACTIVE)
123 #define XFS_ALL_QUOTA_ACCT_ENFD (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
124 XFS_GQUOTA_ACCT|XFS_GQUOTA_ENFD)
125
126 #define XFS_IS_QUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_ALL_QUOTA_ACCT)
127 #define XFS_IS_UQUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_UQUOTA_ACCT)
128 #define XFS_IS_GQUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_GQUOTA_ACCT)
129
130 /*
131 * Quota Limit Enforcement flags
132 */
133 #define XFS_IS_QUOTA_ENFORCED(mp) ((mp)->m_qflags & XFS_ALL_QUOTA_ENFD)
134 #define XFS_IS_UQUOTA_ENFORCED(mp) ((mp)->m_qflags & XFS_UQUOTA_ENFD)
135 #define XFS_IS_GQUOTA_ENFORCED(mp) ((mp)->m_qflags & XFS_GQUOTA_ENFD)
136
137 #ifdef DEBUG
138 static inline int
139 XFS_DQ_IS_LOCKED(xfs_dquot_t *dqp)
140 {
141 if (mutex_trylock(&dqp->q_qlock)) {
142 mutex_unlock(&dqp->q_qlock);
143 return 0;
144 }
145 return 1;
146 }
147 #endif
148
149
150 /*
151 * The following three routines simply manage the q_flock
152 * semaphore embedded in the dquot. This semaphore synchronizes
153 * processes attempting to flush the in-core dquot back to disk.
154 */
155 #define xfs_dqflock(dqp) { psema(&((dqp)->q_flock), PINOD | PRECALC);\
156 (dqp)->dq_flags |= XFS_DQ_FLOCKED; }
157 #define xfs_dqfunlock(dqp) { ASSERT(valusema(&((dqp)->q_flock)) <= 0); \
158 vsema(&((dqp)->q_flock)); \
159 (dqp)->dq_flags &= ~(XFS_DQ_FLOCKED); }
160
161 #define XFS_DQ_PINLOCK(dqp) mutex_spinlock( \
162 &(XFS_DQ_TO_QINF(dqp)->qi_pinlock))
163 #define XFS_DQ_PINUNLOCK(dqp, s) mutex_spinunlock( \
164 &(XFS_DQ_TO_QINF(dqp)->qi_pinlock), s)
165
166 #define XFS_DQ_IS_FLUSH_LOCKED(dqp) (valusema(&((dqp)->q_flock)) <= 0)
167 #define XFS_DQ_IS_ON_FREELIST(dqp) ((dqp)->dq_flnext != (dqp))
168 #define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY)
169 #define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER)
170 #define XFS_DQ_TO_QINF(dqp) ((dqp)->q_mount->m_quotainfo)
171 #define XFS_DQ_TO_QIP(dqp) (XFS_QM_ISUDQ(dqp) ? \
172 XFS_DQ_TO_QINF(dqp)->qi_uquotaip : \
173 XFS_DQ_TO_QINF(dqp)->qi_gquotaip)
174
175 #define XFS_IS_THIS_QUOTA_OFF(d) (! (XFS_QM_ISUDQ(d) ? \
176 (XFS_IS_UQUOTA_ON((d)->q_mount)) : \
177 (XFS_IS_GQUOTA_ON((d)->q_mount))))
178
179 #ifdef XFS_DQUOT_TRACE
180 /*
181 * Dquot Tracing stuff.
182 */
183 #define DQUOT_TRACE_SIZE 64
184 #define DQUOT_KTRACE_ENTRY 1
185
186 extern void __xfs_dqtrace_entry(xfs_dquot_t *dqp, char *func,
187 void *, xfs_inode_t *);
188 #define xfs_dqtrace_entry_ino(a,b,ip) \
189 __xfs_dqtrace_entry((a), (b), (void*)__return_address, (ip))
190 #define xfs_dqtrace_entry(a,b) \
191 __xfs_dqtrace_entry((a), (b), (void*)__return_address, NULL)
192 #else
193 #define xfs_dqtrace_entry(a,b)
194 #define xfs_dqtrace_entry_ino(a,b,ip)
195 #endif
196
197 #ifdef QUOTADEBUG
198 extern void xfs_qm_dqprint(xfs_dquot_t *);
199 #else
200 #define xfs_qm_dqprint(a)
201 #endif
202
203 extern void xfs_qm_dqdestroy(xfs_dquot_t *);
204 extern int xfs_qm_dqflush(xfs_dquot_t *, uint);
205 extern int xfs_qm_dqpurge(xfs_dquot_t *, uint);
206 extern void xfs_qm_dqunpin_wait(xfs_dquot_t *);
207 extern int xfs_qm_dqlock_nowait(xfs_dquot_t *);
208 extern int xfs_qm_dqflock_nowait(xfs_dquot_t *);
209 extern void xfs_qm_dqflock_pushbuf_wait(xfs_dquot_t *dqp);
210 extern void xfs_qm_adjust_dqtimers(xfs_mount_t *,
211 xfs_disk_dquot_t *);
212 extern void xfs_qm_adjust_dqlimits(xfs_mount_t *,
213 xfs_disk_dquot_t *);
214 extern int xfs_qm_dqwarn(xfs_disk_dquot_t *, uint);
215 extern int xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *,
216 xfs_dqid_t, uint, uint, xfs_dquot_t **);
217 extern void xfs_qm_dqput(xfs_dquot_t *);
218 extern void xfs_qm_dqrele(xfs_dquot_t *);
219 extern void xfs_dqlock(xfs_dquot_t *);
220 extern void xfs_dqlock2(xfs_dquot_t *, xfs_dquot_t *);
221 extern void xfs_dqunlock(xfs_dquot_t *);
222 extern void xfs_dqunlock_nonotify(xfs_dquot_t *);
223
224 #endif /* __XFS_DQUOT_H__ */
225
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