1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#ifndef __XFS_DQUOT_H__
#define __XFS_DQUOT_H__
/*
* Dquots are structures that hold quota information about a user or a group,
* much like inodes are for files. In fact, dquots share many characteristics
* with inodes. However, dquots can also be a centralized resource, relative
* to a collection of inodes. In this respect, dquots share some characteristics
* of the superblock.
* XFS dquots exploit both those in its algorithms. They make every attempt
* to not be a bottleneck when quotas are on and have minimal impact, if any,
* when quotas are off.
*/
struct xfs_mount;
struct xfs_trans;
enum {
XFS_QLOWSP_1_PCNT = 0,
XFS_QLOWSP_3_PCNT,
XFS_QLOWSP_5_PCNT,
XFS_QLOWSP_MAX
};
/*
* The incore dquot structure
*/
typedef struct xfs_dquot {
uint dq_flags; /* various flags (XFS_DQ_*) */
struct list_head q_lru; /* global free list of dquots */
struct xfs_mount*q_mount; /* filesystem this relates to */
uint q_nrefs; /* # active refs from inodes */
xfs_daddr_t q_blkno; /* blkno of dquot buffer */
int q_bufoffset; /* off of dq in buffer (# dquots) */
xfs_fileoff_t q_fileoffset; /* offset in quotas file */
xfs_disk_dquot_t q_core; /* actual usage & quotas */
xfs_dq_logitem_t q_logitem; /* dquot log item */
xfs_qcnt_t q_res_bcount; /* total regular nblks used+reserved */
xfs_qcnt_t q_res_icount; /* total inos allocd+reserved */
xfs_qcnt_t q_res_rtbcount;/* total realtime blks used+reserved */
xfs_qcnt_t q_prealloc_lo_wmark;/* prealloc throttle wmark */
xfs_qcnt_t q_prealloc_hi_wmark;/* prealloc disabled wmark */
int64_t q_low_space[XFS_QLOWSP_MAX];
struct mutex q_qlock; /* quota lock */
struct completion q_flush; /* flush completion queue */
atomic_t q_pincount; /* dquot pin count */
wait_queue_head_t q_pinwait; /* dquot pinning wait queue */
} xfs_dquot_t;
/*
* Lock hierarchy for q_qlock:
* XFS_QLOCK_NORMAL is the implicit default,
* XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
*/
enum {
XFS_QLOCK_NORMAL = 0,
XFS_QLOCK_NESTED,
};
/*
* Manage the q_flush completion queue embedded in the dquot. This completion
* queue synchronizes processes attempting to flush the in-core dquot back to
* disk.
*/
static inline void xfs_dqflock(xfs_dquot_t *dqp)
{
wait_for_completion(&dqp->q_flush);
}
static inline bool xfs_dqflock_nowait(xfs_dquot_t *dqp)
{
return try_wait_for_completion(&dqp->q_flush);
}
static inline void xfs_dqfunlock(xfs_dquot_t *dqp)
{
complete(&dqp->q_flush);
}
static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp)
{
return mutex_trylock(&dqp->q_qlock);
}
static inline void xfs_dqlock(struct xfs_dquot *dqp)
{
mutex_lock(&dqp->q_qlock);
}
static inline void xfs_dqunlock(struct xfs_dquot *dqp)
{
mutex_unlock(&dqp->q_qlock);
}
static inline int xfs_this_quota_on(struct xfs_mount *mp, int type)
{
switch (type & XFS_DQ_ALLTYPES) {
case XFS_DQ_USER:
return XFS_IS_UQUOTA_ON(mp);
case XFS_DQ_GROUP:
return XFS_IS_GQUOTA_ON(mp);
case XFS_DQ_PROJ:
return XFS_IS_PQUOTA_ON(mp);
default:
return 0;
}
}
static inline xfs_dquot_t *xfs_inode_dquot(struct xfs_inode *ip, int type)
{
switch (type & XFS_DQ_ALLTYPES) {
case XFS_DQ_USER:
return ip->i_udquot;
case XFS_DQ_GROUP:
return ip->i_gdquot;
case XFS_DQ_PROJ:
return ip->i_pdquot;
default:
return NULL;
}
}
/*
* Check whether a dquot is under low free space conditions. We assume the quota
* is enabled and enforced.
*/
static inline bool xfs_dquot_lowsp(struct xfs_dquot *dqp)
{
int64_t freesp;
freesp = be64_to_cpu(dqp->q_core.d_blk_hardlimit) - dqp->q_res_bcount;
if (freesp < dqp->q_low_space[XFS_QLOWSP_1_PCNT])
return true;
return false;
}
#define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock)))
#define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY)
#define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER)
#define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ)
#define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP)
extern void xfs_qm_dqdestroy(xfs_dquot_t *);
extern int xfs_qm_dqflush(struct xfs_dquot *, struct xfs_buf **);
extern void xfs_qm_dqunpin_wait(xfs_dquot_t *);
extern void xfs_qm_adjust_dqtimers(xfs_mount_t *,
xfs_disk_dquot_t *);
extern void xfs_qm_adjust_dqlimits(struct xfs_mount *,
struct xfs_dquot *);
extern xfs_dqid_t xfs_qm_id_for_quotatype(struct xfs_inode *ip,
uint type);
extern int xfs_qm_dqget(struct xfs_mount *mp, xfs_dqid_t id,
uint type, bool can_alloc,
struct xfs_dquot **dqpp);
extern int xfs_qm_dqget_inode(struct xfs_inode *ip, uint type,
bool can_alloc,
struct xfs_dquot **dqpp);
extern int xfs_qm_dqget_next(struct xfs_mount *mp, xfs_dqid_t id,
uint type, struct xfs_dquot **dqpp);
extern int xfs_qm_dqget_uncached(struct xfs_mount *mp,
xfs_dqid_t id, uint type,
struct xfs_dquot **dqpp);
extern void xfs_qm_dqput(xfs_dquot_t *);
extern void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
extern void xfs_dquot_set_prealloc_limits(struct xfs_dquot *);
static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp)
{
xfs_dqlock(dqp);
dqp->q_nrefs++;
xfs_dqunlock(dqp);
return dqp;
}
typedef int (*xfs_qm_dqiterate_fn)(struct xfs_dquot *dq, uint dqtype,
void *priv);
int xfs_qm_dqiterate(struct xfs_mount *mp, uint dqtype,
xfs_qm_dqiterate_fn iter_fn, void *priv);
#endif /* __XFS_DQUOT_H__ */
|
