2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * 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.
14 * 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
18 #ifndef __XFS_DQUOT_H__
19 #define __XFS_DQUOT_H__
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
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.
36 XFS_QLOWSP_1_PCNT
= 0,
43 * The incore dquot structure
45 typedef struct xfs_dquot
{
46 uint dq_flags
; /* various flags (XFS_DQ_*) */
47 struct list_head q_lru
; /* global free list of dquots */
48 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 */
55 xfs_disk_dquot_t q_core
; /* actual usage & quotas */
56 xfs_dq_logitem_t q_logitem
; /* dquot log item */
57 xfs_qcnt_t q_res_bcount
; /* total regular nblks used+reserved */
58 xfs_qcnt_t q_res_icount
; /* total inos allocd+reserved */
59 xfs_qcnt_t q_res_rtbcount
;/* total realtime blks used+reserved */
60 xfs_qcnt_t q_prealloc_lo_wmark
;/* prealloc throttle wmark */
61 xfs_qcnt_t q_prealloc_hi_wmark
;/* prealloc disabled wmark */
62 int64_t q_low_space
[XFS_QLOWSP_MAX
];
63 struct mutex q_qlock
; /* quota lock */
64 struct completion q_flush
; /* flush completion queue */
65 atomic_t q_pincount
; /* dquot pin count */
66 wait_queue_head_t q_pinwait
; /* dquot pinning wait queue */
70 * Lock hierarchy for q_qlock:
71 * XFS_QLOCK_NORMAL is the implicit default,
72 * XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
80 * Manage the q_flush completion queue embedded in the dquot. This completion
81 * queue synchronizes processes attempting to flush the in-core dquot back to
84 static inline void xfs_dqflock(xfs_dquot_t
*dqp
)
86 wait_for_completion(&dqp
->q_flush
);
89 static inline int xfs_dqflock_nowait(xfs_dquot_t
*dqp
)
91 return try_wait_for_completion(&dqp
->q_flush
);
94 static inline void xfs_dqfunlock(xfs_dquot_t
*dqp
)
96 complete(&dqp
->q_flush
);
99 static inline int xfs_dqlock_nowait(struct xfs_dquot
*dqp
)
101 return mutex_trylock(&dqp
->q_qlock
);
104 static inline void xfs_dqlock(struct xfs_dquot
*dqp
)
106 mutex_lock(&dqp
->q_qlock
);
109 static inline void xfs_dqunlock(struct xfs_dquot
*dqp
)
111 mutex_unlock(&dqp
->q_qlock
);
114 static inline int xfs_this_quota_on(struct xfs_mount
*mp
, int type
)
116 switch (type
& XFS_DQ_ALLTYPES
) {
118 return XFS_IS_UQUOTA_ON(mp
);
120 return XFS_IS_GQUOTA_ON(mp
);
122 return XFS_IS_PQUOTA_ON(mp
);
128 static inline xfs_dquot_t
*xfs_inode_dquot(struct xfs_inode
*ip
, int type
)
130 switch (type
& XFS_DQ_ALLTYPES
) {
142 #define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock)))
143 #define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY)
144 #define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER)
145 #define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ)
146 #define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP)
148 extern int xfs_qm_dqread(struct xfs_mount
*, xfs_dqid_t
, uint
,
149 uint
, struct xfs_dquot
**);
150 extern void xfs_qm_dqdestroy(xfs_dquot_t
*);
151 extern int xfs_qm_dqflush(struct xfs_dquot
*, struct xfs_buf
**);
152 extern void xfs_qm_dqunpin_wait(xfs_dquot_t
*);
153 extern void xfs_qm_adjust_dqtimers(xfs_mount_t
*,
155 extern void xfs_qm_adjust_dqlimits(struct xfs_mount
*,
157 extern int xfs_qm_dqget(xfs_mount_t
*, xfs_inode_t
*,
158 xfs_dqid_t
, uint
, uint
, xfs_dquot_t
**);
159 extern void xfs_qm_dqput(xfs_dquot_t
*);
161 extern void xfs_dqlock2(struct xfs_dquot
*, struct xfs_dquot
*);
163 extern void xfs_dquot_set_prealloc_limits(struct xfs_dquot
*);
165 static inline struct xfs_dquot
*xfs_qm_dqhold(struct xfs_dquot
*dqp
)
173 #endif /* __XFS_DQUOT_H__ */