2 * Definitions for diskquota-operations. When diskquota is configured these
3 * macros expand to the right source-code.
5 * Author: Marco van Wieringen <mvw@planets.elm.net>
7 #ifndef _LINUX_QUOTAOPS_
8 #define _LINUX_QUOTAOPS_
12 #define DQUOT_SPACE_WARN 0x1
13 #define DQUOT_SPACE_RESERVE 0x2
14 #define DQUOT_SPACE_NOFAIL 0x4
16 static inline struct quota_info *sb_dqopt(struct super_block *sb)
21 /* i_mutex must being held */
22 static inline bool is_quota_modification(struct inode *inode, struct iattr *ia)
24 return (ia->ia_valid & ATTR_SIZE && ia->ia_size != inode->i_size) ||
25 (ia->ia_valid & ATTR_UID && !uid_eq(ia->ia_uid, inode->i_uid)) ||
26 (ia->ia_valid & ATTR_GID && !gid_eq(ia->ia_gid, inode->i_gid));
29 #if defined(CONFIG_QUOTA)
31 #define quota_error(sb, fmt, args...) \
32 __quota_error((sb), __func__, fmt , ## args)
35 void __quota_error(struct super_block *sb, const char *func,
36 const char *fmt, ...);
39 * declaration of quota_function calls in kernel.
41 void inode_add_rsv_space(struct inode *inode, qsize_t number);
42 void inode_claim_rsv_space(struct inode *inode, qsize_t number);
43 void inode_sub_rsv_space(struct inode *inode, qsize_t number);
44 void inode_reclaim_rsv_space(struct inode *inode, qsize_t number);
46 int dquot_initialize(struct inode *inode);
47 bool dquot_initialize_needed(struct inode *inode);
48 void dquot_drop(struct inode *inode);
49 struct dquot *dqget(struct super_block *sb, struct kqid qid);
50 static inline struct dquot *dqgrab(struct dquot *dquot)
52 /* Make sure someone else has active reference to dquot */
53 WARN_ON_ONCE(!atomic_read(&dquot->dq_count));
54 WARN_ON_ONCE(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags));
55 atomic_inc(&dquot->dq_count);
58 void dqput(struct dquot *dquot);
59 int dquot_scan_active(struct super_block *sb,
60 int (*fn)(struct dquot *dquot, unsigned long priv),
62 struct dquot *dquot_alloc(struct super_block *sb, int type);
63 void dquot_destroy(struct dquot *dquot);
65 int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags);
66 void __dquot_free_space(struct inode *inode, qsize_t number, int flags);
68 int dquot_alloc_inode(struct inode *inode);
70 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
71 void dquot_free_inode(struct inode *inode);
72 void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number);
74 int dquot_disable(struct super_block *sb, int type, unsigned int flags);
75 /* Suspend quotas on remount RO */
76 static inline int dquot_suspend(struct super_block *sb, int type)
78 return dquot_disable(sb, type, DQUOT_SUSPENDED);
80 int dquot_resume(struct super_block *sb, int type);
82 int dquot_commit(struct dquot *dquot);
83 int dquot_acquire(struct dquot *dquot);
84 int dquot_release(struct dquot *dquot);
85 int dquot_commit_info(struct super_block *sb, int type);
86 int dquot_get_next_id(struct super_block *sb, struct kqid *qid);
87 int dquot_mark_dquot_dirty(struct dquot *dquot);
89 int dquot_file_open(struct inode *inode, struct file *file);
91 int dquot_enable(struct inode *inode, int type, int format_id,
93 int dquot_quota_on(struct super_block *sb, int type, int format_id,
94 const struct path *path);
95 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
96 int format_id, int type);
97 int dquot_quota_off(struct super_block *sb, int type);
98 int dquot_writeback_dquots(struct super_block *sb, int type);
99 int dquot_quota_sync(struct super_block *sb, int type);
100 int dquot_get_state(struct super_block *sb, struct qc_state *state);
101 int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii);
102 int dquot_get_dqblk(struct super_block *sb, struct kqid id,
103 struct qc_dqblk *di);
104 int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id,
105 struct qc_dqblk *di);
106 int dquot_set_dqblk(struct super_block *sb, struct kqid id,
107 struct qc_dqblk *di);
109 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
110 int dquot_transfer(struct inode *inode, struct iattr *iattr);
112 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
114 return sb_dqopt(sb)->info + type;
118 * Functions for checking status of quota
121 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
123 return sb_dqopt(sb)->flags &
124 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
127 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
129 return sb_dqopt(sb)->flags &
130 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
133 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
135 return sb_dqopt(sb)->flags &
136 dquot_state_flag(DQUOT_SUSPENDED, type);
139 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
141 return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED);
144 /* Does kernel know about any quota information for given sb + type? */
145 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
147 /* Currently if anything is on, then quota usage is on as well */
148 return sb_has_quota_usage_enabled(sb, type);
151 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
153 return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED);
156 static inline bool sb_has_quota_active(struct super_block *sb, int type)
158 return sb_has_quota_loaded(sb, type) &&
159 !sb_has_quota_suspended(sb, type);
163 * Operations supported for diskquotas.
165 extern const struct dquot_operations dquot_operations;
166 extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
170 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
175 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
180 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
185 static inline int sb_any_quota_suspended(struct super_block *sb)
190 /* Does kernel know about any quota information for given sb + type? */
191 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
196 static inline int sb_any_quota_loaded(struct super_block *sb)
201 static inline int sb_has_quota_active(struct super_block *sb, int type)
206 static inline int dquot_initialize(struct inode *inode)
211 static inline bool dquot_initialize_needed(struct inode *inode)
216 static inline void dquot_drop(struct inode *inode)
220 static inline int dquot_alloc_inode(struct inode *inode)
225 static inline void dquot_free_inode(struct inode *inode)
229 static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
234 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
237 if (!(flags & DQUOT_SPACE_RESERVE))
238 inode_add_bytes(inode, number);
242 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
245 if (!(flags & DQUOT_SPACE_RESERVE))
246 inode_sub_bytes(inode, number);
249 static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
251 inode_add_bytes(inode, number);
255 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
258 inode_sub_bytes(inode, number);
262 static inline int dquot_disable(struct super_block *sb, int type,
268 static inline int dquot_suspend(struct super_block *sb, int type)
273 static inline int dquot_resume(struct super_block *sb, int type)
278 #define dquot_file_open generic_file_open
280 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
285 #endif /* CONFIG_QUOTA */
287 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
289 return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
292 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
294 __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
295 mark_inode_dirty_sync(inode);
298 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
302 ret = dquot_alloc_space_nodirty(inode, nr);
305 * Mark inode fully dirty. Since we are allocating blocks, inode
306 * would become fully dirty soon anyway and it reportedly
307 * reduces lock contention.
309 mark_inode_dirty(inode);
314 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
316 return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
319 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
321 dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
324 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
326 return dquot_alloc_space(inode, nr << inode->i_blkbits);
329 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
331 return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
334 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
338 ret = dquot_prealloc_block_nodirty(inode, nr);
340 mark_inode_dirty_sync(inode);
344 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
346 return __dquot_alloc_space(inode, nr << inode->i_blkbits,
347 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
350 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
354 ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
356 mark_inode_dirty_sync(inode);
360 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
362 dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
363 mark_inode_dirty_sync(inode);
366 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
368 __dquot_free_space(inode, nr, 0);
371 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
373 dquot_free_space_nodirty(inode, nr);
374 mark_inode_dirty_sync(inode);
377 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
379 dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
382 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
384 dquot_free_space(inode, nr << inode->i_blkbits);
387 static inline void dquot_release_reservation_block(struct inode *inode,
390 __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
393 unsigned int qtype_enforce_flag(int type);
395 #endif /* _LINUX_QUOTAOPS_ */