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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070032struct xfs_mount;
33struct xfs_trans;
34
35/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 * The incore dquot structure
37 */
38typedef struct xfs_dquot {
Christoph Hellwig74457cf2010-04-13 15:06:53 +100039 uint dq_flags; /* various flags (XFS_DQ_*) */
Christoph Hellwigf8739c32012-03-13 08:52:34 +000040 struct list_head q_lru; /* global free list of dquots */
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 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 */
Christoph Hellwiga0b0b8a2009-03-29 09:51:00 +020054 struct mutex q_qlock; /* quota lock */
David Chinnere1f49cf2008-08-13 16:41:43 +100055 struct completion q_flush; /* flush completion queue */
Peter Leckiebc3048e2008-10-30 17:05:04 +110056 atomic_t q_pincount; /* dquot pin count */
57 wait_queue_head_t q_pinwait; /* dquot pinning wait queue */
Linus Torvalds1da177e2005-04-16 15:20:36 -070058} xfs_dquot_t;
59
Christoph Hellwig5bb87a32009-01-19 02:03:19 +010060/*
André Goddard Rosaaf901ca2009-11-14 13:09:05 -020061 * Lock hierarchy for q_qlock:
Christoph Hellwig5bb87a32009-01-19 02:03:19 +010062 * XFS_QLOCK_NORMAL is the implicit default,
63 * XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
64 */
65enum {
66 XFS_QLOCK_NORMAL = 0,
67 XFS_QLOCK_NESTED,
68};
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070/*
David Chinnere1f49cf2008-08-13 16:41:43 +100071 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 */
David Chinnere1f49cf2008-08-13 16:41:43 +100075static inline void xfs_dqflock(xfs_dquot_t *dqp)
76{
77 wait_for_completion(&dqp->q_flush);
78}
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
David Chinnere1f49cf2008-08-13 16:41:43 +100080static inline int xfs_dqflock_nowait(xfs_dquot_t *dqp)
81{
82 return try_wait_for_completion(&dqp->q_flush);
83}
84
85static inline void xfs_dqfunlock(xfs_dquot_t *dqp)
86{
87 complete(&dqp->q_flush);
88}
89
Christoph Hellwig800b4842011-12-06 21:58:14 +000090static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp)
91{
92 return mutex_trylock(&dqp->q_qlock);
93}
94
95static inline void xfs_dqlock(struct xfs_dquot *dqp)
96{
97 mutex_lock(&dqp->q_qlock);
98}
99
Christoph Hellwig5b03ff12012-02-20 02:31:22 +0000100static inline void xfs_dqunlock(struct xfs_dquot *dqp)
Christoph Hellwig800b4842011-12-06 21:58:14 +0000101{
102 mutex_unlock(&dqp->q_qlock);
103}
104
Chandra Seetharaman6967b962012-01-23 17:31:25 +0000105static 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
Chandra Seetharaman36731412012-01-23 17:31:30 +0000118static 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
Christoph Hellwig72018132009-02-09 08:39:24 +0100131#define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132#define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY)
133#define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER)
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000134#define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ)
135#define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136#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
Christoph Hellwig7ae44402011-12-06 21:58:25 +0000141extern int xfs_qm_dqread(struct xfs_mount *, xfs_dqid_t, uint,
142 uint, struct xfs_dquot **);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143extern void xfs_qm_dqdestroy(xfs_dquot_t *);
Christoph Hellwigfe7257f2012-04-23 15:58:37 +1000144extern int xfs_qm_dqflush(struct xfs_dquot *, struct xfs_buf **);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145extern void xfs_qm_dqunpin_wait(xfs_dquot_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146extern void xfs_qm_adjust_dqtimers(xfs_mount_t *,
147 xfs_disk_dquot_t *);
148extern void xfs_qm_adjust_dqlimits(xfs_mount_t *,
149 xfs_disk_dquot_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150extern int xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *,
151 xfs_dqid_t, uint, uint, xfs_dquot_t **);
152extern void xfs_qm_dqput(xfs_dquot_t *);
Christoph Hellwig800b4842011-12-06 21:58:14 +0000153
154extern void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Christoph Hellwig78e55892011-12-06 21:58:22 +0000156static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp)
157{
158 xfs_dqlock(dqp);
159 dqp->q_nrefs++;
160 xfs_dqunlock(dqp);
161 return dqp;
162}
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164#endif /* __XFS_DQUOT_H__ */