1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Definitions for diskquota-operations. When diskquota is configured these
4 * macros expand to the right source-code.
6 * Author: Marco van Wieringen <mvw@planets.elm.net>
8 #ifndef _LINUX_QUOTAOPS_
9 #define _LINUX_QUOTAOPS_
13 #define DQUOT_SPACE_WARN 0x1
14 #define DQUOT_SPACE_RESERVE 0x2
15 #define DQUOT_SPACE_NOFAIL 0x4
17 static inline struct quota_info *sb_dqopt(struct super_block *sb)
22 /* i_mutex must being held */
23 static inline bool is_quota_modification(struct inode *inode, struct iattr *ia)
25 return (ia->ia_valid & ATTR_SIZE) ||
26 (ia->ia_valid & ATTR_UID && !uid_eq(ia->ia_uid, inode->i_uid)) ||
27 (ia->ia_valid & ATTR_GID && !gid_eq(ia->ia_gid, inode->i_gid));
30 #if defined(CONFIG_QUOTA)
32 #define quota_error(sb, fmt, args...) \
33 __quota_error((sb), __func__, fmt , ## args)
36 void __quota_error(struct super_block *sb, const char *func,
37 const char *fmt, ...);
40 * declaration of quota_function calls in kernel.
42 int dquot_initialize(struct inode *inode);
43 bool dquot_initialize_needed(struct inode *inode);
44 void dquot_drop(struct inode *inode);
45 struct dquot *dqget(struct super_block *sb, struct kqid qid);
46 static inline struct dquot *dqgrab(struct dquot *dquot)
48 /* Make sure someone else has active reference to dquot */
49 WARN_ON_ONCE(!atomic_read(&dquot->dq_count));
50 WARN_ON_ONCE(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags));
51 atomic_inc(&dquot->dq_count);
55 static inline bool dquot_is_busy(struct dquot *dquot)
57 if (test_bit(DQ_MOD_B, &dquot->dq_flags))
59 if (atomic_read(&dquot->dq_count) > 1)
64 void dqput(struct dquot *dquot);
65 int dquot_scan_active(struct super_block *sb,
66 int (*fn)(struct dquot *dquot, unsigned long priv),
68 struct dquot *dquot_alloc(struct super_block *sb, int type);
69 void dquot_destroy(struct dquot *dquot);
71 int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags);
72 void __dquot_free_space(struct inode *inode, qsize_t number, int flags);
74 int dquot_alloc_inode(struct inode *inode);
76 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
77 void dquot_free_inode(struct inode *inode);
78 void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number);
80 int dquot_disable(struct super_block *sb, int type, unsigned int flags);
81 /* Suspend quotas on remount RO */
82 static inline int dquot_suspend(struct super_block *sb, int type)
84 return dquot_disable(sb, type, DQUOT_SUSPENDED);
86 int dquot_resume(struct super_block *sb, int type);
88 int dquot_commit(struct dquot *dquot);
89 int dquot_acquire(struct dquot *dquot);
90 int dquot_release(struct dquot *dquot);
91 int dquot_commit_info(struct super_block *sb, int type);
92 int dquot_get_next_id(struct super_block *sb, struct kqid *qid);
93 int dquot_mark_dquot_dirty(struct dquot *dquot);
95 int dquot_file_open(struct inode *inode, struct file *file);
97 int dquot_enable(struct inode *inode, int type, int format_id,
99 int dquot_quota_on(struct super_block *sb, int type, int format_id,
100 const struct path *path);
101 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
102 int format_id, int type);
103 int dquot_quota_off(struct super_block *sb, int type);
104 int dquot_writeback_dquots(struct super_block *sb, int type);
105 int dquot_quota_sync(struct super_block *sb, int type);
106 int dquot_get_state(struct super_block *sb, struct qc_state *state);
107 int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii);
108 int dquot_get_dqblk(struct super_block *sb, struct kqid id,
109 struct qc_dqblk *di);
110 int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id,
111 struct qc_dqblk *di);
112 int dquot_set_dqblk(struct super_block *sb, struct kqid id,
113 struct qc_dqblk *di);
115 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
116 int dquot_transfer(struct inode *inode, struct iattr *iattr);
118 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
120 return sb_dqopt(sb)->info + type;
124 * Functions for checking status of quota
127 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
129 return sb_dqopt(sb)->flags &
130 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
133 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
135 return sb_dqopt(sb)->flags &
136 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
139 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
141 return sb_dqopt(sb)->flags &
142 dquot_state_flag(DQUOT_SUSPENDED, type);
145 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
147 return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED);
150 /* Does kernel know about any quota information for given sb + type? */
151 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
153 /* Currently if anything is on, then quota usage is on as well */
154 return sb_has_quota_usage_enabled(sb, type);
157 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
159 return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED);
162 static inline bool sb_has_quota_active(struct super_block *sb, int type)
164 return sb_has_quota_loaded(sb, type) &&
165 !sb_has_quota_suspended(sb, type);
169 * Operations supported for diskquotas.
171 extern const struct dquot_operations dquot_operations;
172 extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
176 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
181 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
186 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
191 static inline int sb_any_quota_suspended(struct super_block *sb)
196 /* Does kernel know about any quota information for given sb + type? */
197 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
202 static inline int sb_any_quota_loaded(struct super_block *sb)
207 static inline int sb_has_quota_active(struct super_block *sb, int type)
212 static inline int dquot_initialize(struct inode *inode)
217 static inline bool dquot_initialize_needed(struct inode *inode)
222 static inline void dquot_drop(struct inode *inode)
226 static inline int dquot_alloc_inode(struct inode *inode)
231 static inline void dquot_free_inode(struct inode *inode)
235 static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
240 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
243 if (!(flags & DQUOT_SPACE_RESERVE))
244 inode_add_bytes(inode, number);
248 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
251 if (!(flags & DQUOT_SPACE_RESERVE))
252 inode_sub_bytes(inode, number);
255 static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
257 inode_add_bytes(inode, number);
261 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
264 inode_sub_bytes(inode, number);
268 static inline int dquot_disable(struct super_block *sb, int type,
274 static inline int dquot_suspend(struct super_block *sb, int type)
279 static inline int dquot_resume(struct super_block *sb, int type)
284 #define dquot_file_open generic_file_open
286 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
291 #endif /* CONFIG_QUOTA */
293 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
295 return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
298 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
300 __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
301 mark_inode_dirty_sync(inode);
304 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
308 ret = dquot_alloc_space_nodirty(inode, nr);
311 * Mark inode fully dirty. Since we are allocating blocks, inode
312 * would become fully dirty soon anyway and it reportedly
313 * reduces lock contention.
315 mark_inode_dirty(inode);
320 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
322 return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
325 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
327 dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
330 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
332 return dquot_alloc_space(inode, nr << inode->i_blkbits);
335 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
337 return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
340 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
344 ret = dquot_prealloc_block_nodirty(inode, nr);
346 mark_inode_dirty_sync(inode);
350 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
352 return __dquot_alloc_space(inode, nr << inode->i_blkbits,
353 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
356 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
360 ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
362 mark_inode_dirty_sync(inode);
366 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
368 dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
369 mark_inode_dirty_sync(inode);
372 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
374 __dquot_free_space(inode, nr, 0);
377 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
379 dquot_free_space_nodirty(inode, nr);
380 mark_inode_dirty_sync(inode);
383 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
385 dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
388 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
390 dquot_free_space(inode, nr << inode->i_blkbits);
393 static inline void dquot_release_reservation_block(struct inode *inode,
396 __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
399 unsigned int qtype_enforce_flag(int type);
401 #endif /* _LINUX_QUOTAOPS_ */