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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott4ce31212005-11-02 14:59:41 +11002 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott4ce31212005-11-02 14:59:41 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott4ce31212005-11-02 14:59:41 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott4ce31212005-11-02 14:59:41 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
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 */
35typedef struct xfs_dqhash {
36 struct xfs_dquot *qh_next;
Christoph Hellwiga0b0b8a2009-03-29 09:51:00 +020037 struct mutex qh_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 uint qh_version; /* ever increasing version */
39 uint qh_nelems; /* number of dquots on the list */
40} xfs_dqhash_t;
41
42typedef 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
47struct xfs_mount;
48struct 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 */
57typedef 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 */
68typedef 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 */
Christoph Hellwiga0b0b8a2009-03-29 09:51:00 +020084 struct mutex q_qlock; /* quota lock */
David Chinnere1f49cf2008-08-13 16:41:43 +100085 struct completion q_flush; /* flush completion queue */
Peter Leckiebc3048e2008-10-30 17:05:04 +110086 atomic_t q_pincount; /* dquot pin count */
87 wait_queue_head_t q_pinwait; /* dquot pinning wait queue */
Linus Torvalds1da177e2005-04-16 15:20:36 -070088#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
Christoph Hellwig5bb87a32009-01-19 02:03:19 +0100100/*
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200101 * Lock hierarchy for q_qlock:
Christoph Hellwig5bb87a32009-01-19 02:03:19 +0100102 * XFS_QLOCK_NORMAL is the implicit default,
103 * XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
104 */
105enum {
106 XFS_QLOCK_NORMAL = 0,
107 XFS_QLOCK_NESTED,
108};
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110#define XFS_DQHOLD(dqp) ((dqp)->q_nrefs++)
111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112/*
David Chinnere1f49cf2008-08-13 16:41:43 +1000113 * Manage the q_flush completion queue embedded in the dquot. This completion
114 * queue synchronizes processes attempting to flush the in-core dquot back to
115 * disk.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 */
David Chinnere1f49cf2008-08-13 16:41:43 +1000117static inline void xfs_dqflock(xfs_dquot_t *dqp)
118{
119 wait_for_completion(&dqp->q_flush);
120}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
David Chinnere1f49cf2008-08-13 16:41:43 +1000122static inline int xfs_dqflock_nowait(xfs_dquot_t *dqp)
123{
124 return try_wait_for_completion(&dqp->q_flush);
125}
126
127static inline void xfs_dqfunlock(xfs_dquot_t *dqp)
128{
129 complete(&dqp->q_flush);
130}
131
Christoph Hellwig72018132009-02-09 08:39:24 +0100132#define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133#define XFS_DQ_IS_ON_FREELIST(dqp) ((dqp)->dq_flnext != (dqp))
134#define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY)
135#define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER)
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000136#define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ)
137#define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138#define XFS_DQ_TO_QINF(dqp) ((dqp)->q_mount->m_quotainfo)
139#define XFS_DQ_TO_QIP(dqp) (XFS_QM_ISUDQ(dqp) ? \
140 XFS_DQ_TO_QINF(dqp)->qi_uquotaip : \
141 XFS_DQ_TO_QINF(dqp)->qi_gquotaip)
142
143#define XFS_IS_THIS_QUOTA_OFF(d) (! (XFS_QM_ISUDQ(d) ? \
144 (XFS_IS_UQUOTA_ON((d)->q_mount)) : \
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000145 (XFS_IS_OQUOTA_ON((d)->q_mount))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
147#ifdef XFS_DQUOT_TRACE
148/*
149 * Dquot Tracing stuff.
150 */
151#define DQUOT_TRACE_SIZE 64
152#define DQUOT_KTRACE_ENTRY 1
153
154extern void __xfs_dqtrace_entry(xfs_dquot_t *dqp, char *func,
155 void *, xfs_inode_t *);
156#define xfs_dqtrace_entry_ino(a,b,ip) \
157 __xfs_dqtrace_entry((a), (b), (void*)__return_address, (ip))
158#define xfs_dqtrace_entry(a,b) \
159 __xfs_dqtrace_entry((a), (b), (void*)__return_address, NULL)
160#else
161#define xfs_dqtrace_entry(a,b)
162#define xfs_dqtrace_entry_ino(a,b,ip)
163#endif
164
165#ifdef QUOTADEBUG
166extern void xfs_qm_dqprint(xfs_dquot_t *);
167#else
168#define xfs_qm_dqprint(a)
169#endif
170
171extern void xfs_qm_dqdestroy(xfs_dquot_t *);
172extern int xfs_qm_dqflush(xfs_dquot_t *, uint);
Denys Vlasenko4f0e8a92008-05-19 16:34:04 +1000173extern int xfs_qm_dqpurge(xfs_dquot_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174extern void xfs_qm_dqunpin_wait(xfs_dquot_t *);
175extern int xfs_qm_dqlock_nowait(xfs_dquot_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176extern void xfs_qm_dqflock_pushbuf_wait(xfs_dquot_t *dqp);
177extern void xfs_qm_adjust_dqtimers(xfs_mount_t *,
178 xfs_disk_dquot_t *);
179extern void xfs_qm_adjust_dqlimits(xfs_mount_t *,
180 xfs_disk_dquot_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181extern int xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *,
182 xfs_dqid_t, uint, uint, xfs_dquot_t **);
183extern void xfs_qm_dqput(xfs_dquot_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184extern void xfs_dqlock(xfs_dquot_t *);
185extern void xfs_dqlock2(xfs_dquot_t *, xfs_dquot_t *);
186extern void xfs_dqunlock(xfs_dquot_t *);
187extern void xfs_dqunlock_nonotify(xfs_dquot_t *);
188
189#endif /* __XFS_DQUOT_H__ */