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 int kernel_quotactl(unsigned int cmd, const char __user *special,
31 qid_t id, void __user *addr);
33 #if defined(CONFIG_QUOTA)
35 #define quota_error(sb, fmt, args...) \
36 __quota_error((sb), __func__, fmt , ## args)
39 void __quota_error(struct super_block *sb, const char *func,
40 const char *fmt, ...);
43 * declaration of quota_function calls in kernel.
45 int dquot_initialize(struct inode *inode);
46 bool dquot_initialize_needed(struct inode *inode);
47 void dquot_drop(struct inode *inode);
48 struct dquot *dqget(struct super_block *sb, struct kqid qid);
49 static inline struct dquot *dqgrab(struct dquot *dquot)
51 /* Make sure someone else has active reference to dquot */
52 WARN_ON_ONCE(!atomic_read(&dquot->dq_count));
53 WARN_ON_ONCE(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags));
54 atomic_inc(&dquot->dq_count);
58 static inline bool dquot_is_busy(struct dquot *dquot)
60 if (test_bit(DQ_MOD_B, &dquot->dq_flags))
62 if (atomic_read(&dquot->dq_count) > 1)
67 void dqput(struct dquot *dquot);
68 int dquot_scan_active(struct super_block *sb,
69 int (*fn)(struct dquot *dquot, unsigned long priv),
71 struct dquot *dquot_alloc(struct super_block *sb, int type);
72 void dquot_destroy(struct dquot *dquot);
74 int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags);
75 void __dquot_free_space(struct inode *inode, qsize_t number, int flags);
77 int dquot_alloc_inode(struct inode *inode);
79 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
80 void dquot_free_inode(struct inode *inode);
81 void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number);
83 int dquot_disable(struct super_block *sb, int type, unsigned int flags);
84 /* Suspend quotas on remount RO */
85 static inline int dquot_suspend(struct super_block *sb, int type)
87 return dquot_disable(sb, type, DQUOT_SUSPENDED);
89 int dquot_resume(struct super_block *sb, int type);
91 int dquot_commit(struct dquot *dquot);
92 int dquot_acquire(struct dquot *dquot);
93 int dquot_release(struct dquot *dquot);
94 int dquot_commit_info(struct super_block *sb, int type);
95 int dquot_get_next_id(struct super_block *sb, struct kqid *qid);
96 int dquot_mark_dquot_dirty(struct dquot *dquot);
98 int dquot_file_open(struct inode *inode, struct file *file);
100 int dquot_enable(struct inode *inode, int type, int format_id,
102 int dquot_quota_on(struct super_block *sb, int type, int format_id,
103 const struct path *path);
104 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
105 int format_id, int type);
106 int dquot_quota_off(struct super_block *sb, int type);
107 int dquot_writeback_dquots(struct super_block *sb, int type);
108 int dquot_quota_sync(struct super_block *sb, int type);
109 int dquot_get_state(struct super_block *sb, struct qc_state *state);
110 int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii);
111 int dquot_get_dqblk(struct super_block *sb, struct kqid id,
112 struct qc_dqblk *di);
113 int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id,
114 struct qc_dqblk *di);
115 int dquot_set_dqblk(struct super_block *sb, struct kqid id,
116 struct qc_dqblk *di);
118 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
119 int dquot_transfer(struct inode *inode, struct iattr *iattr);
121 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
123 return sb_dqopt(sb)->info + type;
127 * Functions for checking status of quota
130 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
132 return sb_dqopt(sb)->flags &
133 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
136 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
138 return sb_dqopt(sb)->flags &
139 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
142 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
144 return sb_dqopt(sb)->flags &
145 dquot_state_flag(DQUOT_SUSPENDED, type);
148 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
150 return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED);
153 /* Does kernel know about any quota information for given sb + type? */
154 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
156 /* Currently if anything is on, then quota usage is on as well */
157 return sb_has_quota_usage_enabled(sb, type);
160 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
162 return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED);
165 static inline bool sb_has_quota_active(struct super_block *sb, int type)
167 return sb_has_quota_loaded(sb, type) &&
168 !sb_has_quota_suspended(sb, type);
172 * Operations supported for diskquotas.
174 extern const struct dquot_operations dquot_operations;
175 extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
179 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
184 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
189 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
194 static inline int sb_any_quota_suspended(struct super_block *sb)
199 /* Does kernel know about any quota information for given sb + type? */
200 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
205 static inline int sb_any_quota_loaded(struct super_block *sb)
210 static inline int sb_has_quota_active(struct super_block *sb, int type)
215 static inline int dquot_initialize(struct inode *inode)
220 static inline bool dquot_initialize_needed(struct inode *inode)
225 static inline void dquot_drop(struct inode *inode)
229 static inline int dquot_alloc_inode(struct inode *inode)
234 static inline void dquot_free_inode(struct inode *inode)
238 static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
243 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
246 if (!(flags & DQUOT_SPACE_RESERVE))
247 inode_add_bytes(inode, number);
251 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
254 if (!(flags & DQUOT_SPACE_RESERVE))
255 inode_sub_bytes(inode, number);
258 static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
260 inode_add_bytes(inode, number);
264 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
267 inode_sub_bytes(inode, number);
271 static inline int dquot_disable(struct super_block *sb, int type,
277 static inline int dquot_suspend(struct super_block *sb, int type)
282 static inline int dquot_resume(struct super_block *sb, int type)
287 #define dquot_file_open generic_file_open
289 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
294 #endif /* CONFIG_QUOTA */
296 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
298 return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
301 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
303 __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
304 mark_inode_dirty_sync(inode);
307 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
311 ret = dquot_alloc_space_nodirty(inode, nr);
314 * Mark inode fully dirty. Since we are allocating blocks, inode
315 * would become fully dirty soon anyway and it reportedly
316 * reduces lock contention.
318 mark_inode_dirty(inode);
323 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
325 return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
328 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
330 dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
333 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
335 return dquot_alloc_space(inode, nr << inode->i_blkbits);
338 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
340 return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
343 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
347 ret = dquot_prealloc_block_nodirty(inode, nr);
349 mark_inode_dirty_sync(inode);
353 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
355 return __dquot_alloc_space(inode, nr << inode->i_blkbits,
356 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
359 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
363 ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
365 mark_inode_dirty_sync(inode);
369 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
371 dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
372 mark_inode_dirty_sync(inode);
375 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
377 __dquot_free_space(inode, nr, 0);
380 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
382 dquot_free_space_nodirty(inode, nr);
383 mark_inode_dirty_sync(inode);
386 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
388 dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
391 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
393 dquot_free_space(inode, nr << inode->i_blkbits);
396 static inline void dquot_release_reservation_block(struct inode *inode,
399 __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
402 unsigned int qtype_enforce_flag(int type);
404 #endif /* _LINUX_QUOTAOPS_ */