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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 {
Dave Chinnere6a81f12010-04-13 15:06:51 +100036 struct list_head qh_list;
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070042struct xfs_mount;
43struct xfs_trans;
44
45/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 * The incore dquot structure
47 */
48typedef struct xfs_dquot {
Christoph Hellwig74457cf2010-04-13 15:06:53 +100049 uint dq_flags; /* various flags (XFS_DQ_*) */
Dave Chinner3a8406f2010-04-13 15:06:52 +100050 struct list_head q_freelist; /* global free list of dquots */
Dave Chinner3a254042010-04-13 15:06:48 +100051 struct list_head q_mplist; /* mount's list of dquots */
Dave Chinner3a8406f2010-04-13 15:06:52 +100052 struct list_head q_hashlist; /* gloabl hash list of dquots */
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 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 */
Christoph Hellwiga0b0b8a2009-03-29 09:51:00 +020067 struct mutex q_qlock; /* quota lock */
David Chinnere1f49cf2008-08-13 16:41:43 +100068 struct completion q_flush; /* flush completion queue */
Peter Leckiebc3048e2008-10-30 17:05:04 +110069 atomic_t q_pincount; /* dquot pin count */
70 wait_queue_head_t q_pinwait; /* dquot pinning wait queue */
Linus Torvalds1da177e2005-04-16 15:20:36 -070071} xfs_dquot_t;
72
Christoph Hellwig5bb87a32009-01-19 02:03:19 +010073/*
André Goddard Rosaaf901ca2009-11-14 13:09:05 -020074 * Lock hierarchy for q_qlock:
Christoph Hellwig5bb87a32009-01-19 02:03:19 +010075 * XFS_QLOCK_NORMAL is the implicit default,
76 * XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
77 */
78enum {
79 XFS_QLOCK_NORMAL = 0,
80 XFS_QLOCK_NESTED,
81};
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#define XFS_DQHOLD(dqp) ((dqp)->q_nrefs++)
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085/*
David Chinnere1f49cf2008-08-13 16:41:43 +100086 * Manage the q_flush completion queue embedded in the dquot. This completion
87 * queue synchronizes processes attempting to flush the in-core dquot back to
88 * disk.
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 */
David Chinnere1f49cf2008-08-13 16:41:43 +100090static inline void xfs_dqflock(xfs_dquot_t *dqp)
91{
92 wait_for_completion(&dqp->q_flush);
93}
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
David Chinnere1f49cf2008-08-13 16:41:43 +100095static inline int xfs_dqflock_nowait(xfs_dquot_t *dqp)
96{
97 return try_wait_for_completion(&dqp->q_flush);
98}
99
100static inline void xfs_dqfunlock(xfs_dquot_t *dqp)
101{
102 complete(&dqp->q_flush);
103}
104
Christoph Hellwig72018132009-02-09 08:39:24 +0100105#define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106#define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY)
107#define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER)
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000108#define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ)
109#define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110#define XFS_DQ_TO_QINF(dqp) ((dqp)->q_mount->m_quotainfo)
111#define XFS_DQ_TO_QIP(dqp) (XFS_QM_ISUDQ(dqp) ? \
112 XFS_DQ_TO_QINF(dqp)->qi_uquotaip : \
113 XFS_DQ_TO_QINF(dqp)->qi_gquotaip)
114
115#define XFS_IS_THIS_QUOTA_OFF(d) (! (XFS_QM_ISUDQ(d) ? \
116 (XFS_IS_UQUOTA_ON((d)->q_mount)) : \
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000117 (XFS_IS_OQUOTA_ON((d)->q_mount))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119extern void xfs_qm_dqdestroy(xfs_dquot_t *);
120extern int xfs_qm_dqflush(xfs_dquot_t *, uint);
Denys Vlasenko4f0e8a92008-05-19 16:34:04 +1000121extern int xfs_qm_dqpurge(xfs_dquot_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122extern void xfs_qm_dqunpin_wait(xfs_dquot_t *);
123extern int xfs_qm_dqlock_nowait(xfs_dquot_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124extern void xfs_qm_dqflock_pushbuf_wait(xfs_dquot_t *dqp);
125extern void xfs_qm_adjust_dqtimers(xfs_mount_t *,
126 xfs_disk_dquot_t *);
127extern void xfs_qm_adjust_dqlimits(xfs_mount_t *,
128 xfs_disk_dquot_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129extern int xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *,
130 xfs_dqid_t, uint, uint, xfs_dquot_t **);
131extern void xfs_qm_dqput(xfs_dquot_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132extern void xfs_dqlock(xfs_dquot_t *);
133extern void xfs_dqlock2(xfs_dquot_t *, xfs_dquot_t *);
134extern void xfs_dqunlock(xfs_dquot_t *);
135extern void xfs_dqunlock_nonotify(xfs_dquot_t *);
136
137#endif /* __XFS_DQUOT_H__ */