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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
Brian Fosterb1366452013-03-18 10:51:46 -040035enum {
36 XFS_QLOWSP_1_PCNT = 0,
37 XFS_QLOWSP_3_PCNT,
38 XFS_QLOWSP_5_PCNT,
39 XFS_QLOWSP_MAX
40};
41
Linus Torvalds1da177e2005-04-16 15:20:36 -070042/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 * The incore dquot structure
44 */
45typedef struct xfs_dquot {
Christoph Hellwig74457cf2010-04-13 15:06:53 +100046 uint dq_flags; /* various flags (XFS_DQ_*) */
Christoph Hellwigf8739c32012-03-13 08:52:34 +000047 struct list_head q_lru; /* global free list of dquots */
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 struct xfs_mount*q_mount; /* filesystem this relates to */
49 struct xfs_trans*q_transp; /* trans this belongs to currently */
50 uint q_nrefs; /* # active refs from inodes */
51 xfs_daddr_t q_blkno; /* blkno of dquot buffer */
52 int q_bufoffset; /* off of dq in buffer (# dquots) */
53 xfs_fileoff_t q_fileoffset; /* offset in quotas file */
54
55 struct xfs_dquot*q_gdquot; /* group dquot, hint only */
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -050056 struct xfs_dquot*q_pdquot; /* project dquot, hint only */
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 xfs_disk_dquot_t q_core; /* actual usage & quotas */
58 xfs_dq_logitem_t q_logitem; /* dquot log item */
59 xfs_qcnt_t q_res_bcount; /* total regular nblks used+reserved */
60 xfs_qcnt_t q_res_icount; /* total inos allocd+reserved */
61 xfs_qcnt_t q_res_rtbcount;/* total realtime blks used+reserved */
Brian Fosterb1366452013-03-18 10:51:46 -040062 xfs_qcnt_t q_prealloc_lo_wmark;/* prealloc throttle wmark */
63 xfs_qcnt_t q_prealloc_hi_wmark;/* prealloc disabled wmark */
64 int64_t q_low_space[XFS_QLOWSP_MAX];
Christoph Hellwiga0b0b8a2009-03-29 09:51:00 +020065 struct mutex q_qlock; /* quota lock */
David Chinnere1f49cf2008-08-13 16:41:43 +100066 struct completion q_flush; /* flush completion queue */
Peter Leckiebc3048e2008-10-30 17:05:04 +110067 atomic_t q_pincount; /* dquot pin count */
68 wait_queue_head_t q_pinwait; /* dquot pinning wait queue */
Linus Torvalds1da177e2005-04-16 15:20:36 -070069} xfs_dquot_t;
70
Christoph Hellwig5bb87a32009-01-19 02:03:19 +010071/*
André Goddard Rosaaf901ca2009-11-14 13:09:05 -020072 * Lock hierarchy for q_qlock:
Christoph Hellwig5bb87a32009-01-19 02:03:19 +010073 * XFS_QLOCK_NORMAL is the implicit default,
74 * XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
75 */
76enum {
77 XFS_QLOCK_NORMAL = 0,
78 XFS_QLOCK_NESTED,
79};
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081/*
David Chinnere1f49cf2008-08-13 16:41:43 +100082 * Manage the q_flush completion queue embedded in the dquot. This completion
83 * queue synchronizes processes attempting to flush the in-core dquot back to
84 * disk.
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 */
David Chinnere1f49cf2008-08-13 16:41:43 +100086static inline void xfs_dqflock(xfs_dquot_t *dqp)
87{
88 wait_for_completion(&dqp->q_flush);
89}
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
David Chinnere1f49cf2008-08-13 16:41:43 +100091static inline int xfs_dqflock_nowait(xfs_dquot_t *dqp)
92{
93 return try_wait_for_completion(&dqp->q_flush);
94}
95
96static inline void xfs_dqfunlock(xfs_dquot_t *dqp)
97{
98 complete(&dqp->q_flush);
99}
100
Christoph Hellwig800b4842011-12-06 21:58:14 +0000101static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp)
102{
103 return mutex_trylock(&dqp->q_qlock);
104}
105
106static inline void xfs_dqlock(struct xfs_dquot *dqp)
107{
108 mutex_lock(&dqp->q_qlock);
109}
110
Christoph Hellwig5b03ff12012-02-20 02:31:22 +0000111static inline void xfs_dqunlock(struct xfs_dquot *dqp)
Christoph Hellwig800b4842011-12-06 21:58:14 +0000112{
113 mutex_unlock(&dqp->q_qlock);
114}
115
Chandra Seetharaman6967b962012-01-23 17:31:25 +0000116static inline int xfs_this_quota_on(struct xfs_mount *mp, int type)
117{
118 switch (type & XFS_DQ_ALLTYPES) {
119 case XFS_DQ_USER:
120 return XFS_IS_UQUOTA_ON(mp);
121 case XFS_DQ_GROUP:
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -0500122 return XFS_IS_GQUOTA_ON(mp);
Chandra Seetharaman6967b962012-01-23 17:31:25 +0000123 case XFS_DQ_PROJ:
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -0500124 return XFS_IS_PQUOTA_ON(mp);
Chandra Seetharaman6967b962012-01-23 17:31:25 +0000125 default:
126 return 0;
127 }
128}
129
Chandra Seetharaman36731412012-01-23 17:31:30 +0000130static inline xfs_dquot_t *xfs_inode_dquot(struct xfs_inode *ip, int type)
131{
132 switch (type & XFS_DQ_ALLTYPES) {
133 case XFS_DQ_USER:
134 return ip->i_udquot;
135 case XFS_DQ_GROUP:
Chandra Seetharaman36731412012-01-23 17:31:30 +0000136 return ip->i_gdquot;
Chandra Seetharaman92f8ff72013-07-11 00:00:40 -0500137 case XFS_DQ_PROJ:
138 return ip->i_pdquot;
Chandra Seetharaman36731412012-01-23 17:31:30 +0000139 default:
140 return NULL;
141 }
142}
143
Christoph Hellwig72018132009-02-09 08:39:24 +0100144#define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145#define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY)
146#define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER)
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000147#define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ)
148#define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Christoph Hellwig7ae44402011-12-06 21:58:25 +0000150extern int xfs_qm_dqread(struct xfs_mount *, xfs_dqid_t, uint,
151 uint, struct xfs_dquot **);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152extern void xfs_qm_dqdestroy(xfs_dquot_t *);
Christoph Hellwigfe7257f2012-04-23 15:58:37 +1000153extern int xfs_qm_dqflush(struct xfs_dquot *, struct xfs_buf **);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154extern void xfs_qm_dqunpin_wait(xfs_dquot_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155extern void xfs_qm_adjust_dqtimers(xfs_mount_t *,
156 xfs_disk_dquot_t *);
Brian Foster4b6eae2e2013-03-18 10:51:45 -0400157extern void xfs_qm_adjust_dqlimits(struct xfs_mount *,
158 struct xfs_dquot *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159extern int xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *,
160 xfs_dqid_t, uint, uint, xfs_dquot_t **);
161extern void xfs_qm_dqput(xfs_dquot_t *);
Christoph Hellwig800b4842011-12-06 21:58:14 +0000162
163extern void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Brian Fosterb1366452013-03-18 10:51:46 -0400165extern void xfs_dquot_set_prealloc_limits(struct xfs_dquot *);
166
Christoph Hellwig78e55892011-12-06 21:58:22 +0000167static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp)
168{
169 xfs_dqlock(dqp);
170 dqp->q_nrefs++;
171 xfs_dqunlock(dqp);
172 return dqp;
173}
174
Dave Chinner1813dd62012-11-14 17:54:40 +1100175extern const struct xfs_buf_ops xfs_dquot_buf_ops;
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177#endif /* __XFS_DQUOT_H__ */