Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Definitions for diskquota-operations. When diskquota is configured these
3 * macros expand to the right source-code.
4 *
5 * Author: Marco van Wieringen <mvw@planets.elm.net>
6 *
7 * Version: $Id: quotaops.h,v 1.2 1998/01/15 16:22:26 ecd Exp $
8 *
9 */
10#ifndef _LINUX_QUOTAOPS_
11#define _LINUX_QUOTAOPS_
12
13#include <linux/config.h>
14#include <linux/smp_lock.h>
15
16#include <linux/fs.h>
17
18#if defined(CONFIG_QUOTA)
19
20/*
21 * declaration of quota_function calls in kernel.
22 */
23extern void sync_dquots(struct super_block *sb, int type);
24
25extern int dquot_initialize(struct inode *inode, int type);
26extern int dquot_drop(struct inode *inode);
27
28extern int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
29extern int dquot_alloc_inode(const struct inode *inode, unsigned long number);
30
31extern int dquot_free_space(struct inode *inode, qsize_t number);
32extern int dquot_free_inode(const struct inode *inode, unsigned long number);
33
34extern int dquot_transfer(struct inode *inode, struct iattr *iattr);
35extern int dquot_commit(struct dquot *dquot);
36extern int dquot_acquire(struct dquot *dquot);
37extern int dquot_release(struct dquot *dquot);
38extern int dquot_commit_info(struct super_block *sb, int type);
39extern int dquot_mark_dquot_dirty(struct dquot *dquot);
40
41extern int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path);
42extern int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
43 int format_id, int type);
44extern int vfs_quota_off(struct super_block *sb, int type);
45#define vfs_quota_off_mount(sb, type) vfs_quota_off(sb, type)
46extern int vfs_quota_sync(struct super_block *sb, int type);
47extern int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
48extern int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
49extern int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
50extern int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
51
52/*
53 * Operations supported for diskquotas.
54 */
55extern struct dquot_operations dquot_operations;
56extern struct quotactl_ops vfs_quotactl_ops;
57
58#define sb_dquot_ops (&dquot_operations)
59#define sb_quotactl_ops (&vfs_quotactl_ops)
60
61/* It is better to call this function outside of any transaction as it might
62 * need a lot of space in journal for dquot structure allocation. */
63static __inline__ void DQUOT_INIT(struct inode *inode)
64{
65 BUG_ON(!inode->i_sb);
66 if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode))
67 inode->i_sb->dq_op->initialize(inode, -1);
68}
69
70/* The same as with DQUOT_INIT */
71static __inline__ void DQUOT_DROP(struct inode *inode)
72{
73 /* Here we can get arbitrary inode from clear_inode() so we have
74 * to be careful. OTOH we don't need locking as quota operations
75 * are allowed to change only at mount time */
76 if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
77 && inode->i_sb->dq_op->drop) {
78 int cnt;
79 /* Test before calling to rule out calls from proc and such
80 * where we are not allowed to block. Note that this is
81 * actually reliable test even without the lock - the caller
82 * must assure that nobody can come after the DQUOT_DROP and
83 * add quota pointers back anyway */
84 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
85 if (inode->i_dquot[cnt] != NODQUOT)
86 break;
87 if (cnt < MAXQUOTAS)
88 inode->i_sb->dq_op->drop(inode);
89 }
90}
91
92/* The following allocation/freeing/transfer functions *must* be called inside
93 * a transaction (deadlocks possible otherwise) */
94static __inline__ int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
95{
96 if (sb_any_quota_enabled(inode->i_sb)) {
97 /* Used space is updated in alloc_space() */
98 if (inode->i_sb->dq_op->alloc_space(inode, nr, 1) == NO_QUOTA)
99 return 1;
100 }
101 else
102 inode_add_bytes(inode, nr);
103 return 0;
104}
105
106static __inline__ int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
107{
108 int ret;
109 if (!(ret = DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr)))
110 mark_inode_dirty(inode);
111 return ret;
112}
113
114static __inline__ int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
115{
116 if (sb_any_quota_enabled(inode->i_sb)) {
117 /* Used space is updated in alloc_space() */
118 if (inode->i_sb->dq_op->alloc_space(inode, nr, 0) == NO_QUOTA)
119 return 1;
120 }
121 else
122 inode_add_bytes(inode, nr);
123 return 0;
124}
125
126static __inline__ int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
127{
128 int ret;
129 if (!(ret = DQUOT_ALLOC_SPACE_NODIRTY(inode, nr)))
130 mark_inode_dirty(inode);
131 return ret;
132}
133
134static __inline__ int DQUOT_ALLOC_INODE(struct inode *inode)
135{
136 if (sb_any_quota_enabled(inode->i_sb)) {
137 DQUOT_INIT(inode);
138 if (inode->i_sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA)
139 return 1;
140 }
141 return 0;
142}
143
144static __inline__ void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
145{
146 if (sb_any_quota_enabled(inode->i_sb))
147 inode->i_sb->dq_op->free_space(inode, nr);
148 else
149 inode_sub_bytes(inode, nr);
150}
151
152static __inline__ void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr)
153{
154 DQUOT_FREE_SPACE_NODIRTY(inode, nr);
155 mark_inode_dirty(inode);
156}
157
158static __inline__ void DQUOT_FREE_INODE(struct inode *inode)
159{
160 if (sb_any_quota_enabled(inode->i_sb))
161 inode->i_sb->dq_op->free_inode(inode, 1);
162}
163
164static __inline__ int DQUOT_TRANSFER(struct inode *inode, struct iattr *iattr)
165{
166 if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode)) {
167 DQUOT_INIT(inode);
168 if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
169 return 1;
170 }
171 return 0;
172}
173
174/* The following two functions cannot be called inside a transaction */
175#define DQUOT_SYNC(sb) sync_dquots(sb, -1)
176
177static __inline__ int DQUOT_OFF(struct super_block *sb)
178{
179 int ret = -ENOSYS;
180
181 if (sb_any_quota_enabled(sb) && sb->s_qcop && sb->s_qcop->quota_off)
182 ret = sb->s_qcop->quota_off(sb, -1);
183 return ret;
184}
185
186#else
187
188/*
189 * NO-OP when quota not configured.
190 */
191#define sb_dquot_ops (NULL)
192#define sb_quotactl_ops (NULL)
193#define sync_dquots_dev(dev,type) (NULL)
194#define DQUOT_INIT(inode) do { } while(0)
195#define DQUOT_DROP(inode) do { } while(0)
196#define DQUOT_ALLOC_INODE(inode) (0)
197#define DQUOT_FREE_INODE(inode) do { } while(0)
198#define DQUOT_SYNC(sb) do { } while(0)
199#define DQUOT_OFF(sb) do { } while(0)
200#define DQUOT_TRANSFER(inode, iattr) (0)
201extern __inline__ int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
202{
203 inode_add_bytes(inode, nr);
204 return 0;
205}
206
207extern __inline__ int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
208{
209 DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr);
210 mark_inode_dirty(inode);
211 return 0;
212}
213
214extern __inline__ int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
215{
216 inode_add_bytes(inode, nr);
217 return 0;
218}
219
220extern __inline__ int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
221{
222 DQUOT_ALLOC_SPACE_NODIRTY(inode, nr);
223 mark_inode_dirty(inode);
224 return 0;
225}
226
227extern __inline__ void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
228{
229 inode_sub_bytes(inode, nr);
230}
231
232extern __inline__ void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr)
233{
234 DQUOT_FREE_SPACE_NODIRTY(inode, nr);
235 mark_inode_dirty(inode);
236}
237
238#endif /* CONFIG_QUOTA */
239
240#define DQUOT_PREALLOC_BLOCK_NODIRTY(inode, nr) DQUOT_PREALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
241#define DQUOT_PREALLOC_BLOCK(inode, nr) DQUOT_PREALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
242#define DQUOT_ALLOC_BLOCK_NODIRTY(inode, nr) DQUOT_ALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
243#define DQUOT_ALLOC_BLOCK(inode, nr) DQUOT_ALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
244#define DQUOT_FREE_BLOCK_NODIRTY(inode, nr) DQUOT_FREE_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
245#define DQUOT_FREE_BLOCK(inode, nr) DQUOT_FREE_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
246
247#endif /* _LINUX_QUOTAOPS_ */