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.
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_load_quota_sb(struct super_block *sb, int type, int format_id,
102 int dquot_load_quota_inode(struct inode *inode, int type, int format_id,
104 int dquot_quota_on(struct super_block *sb, int type, int format_id,
105 const struct path *path);
106 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
107 int format_id, int type);
108 int dquot_quota_off(struct super_block *sb, int type);
109 int dquot_writeback_dquots(struct super_block *sb, int type);
110 int dquot_quota_sync(struct super_block *sb, int type);
111 int dquot_get_state(struct super_block *sb, struct qc_state *state);
112 int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii);
113 int dquot_get_dqblk(struct super_block *sb, struct kqid id,
114 struct qc_dqblk *di);
115 int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id,
116 struct qc_dqblk *di);
117 int dquot_set_dqblk(struct super_block *sb, struct kqid id,
118 struct qc_dqblk *di);
120 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
121 int dquot_transfer(struct inode *inode, struct iattr *iattr);
123 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
125 return sb_dqopt(sb)->info + type;
129 * Functions for checking status of quota
132 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
134 return sb_dqopt(sb)->flags &
135 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
138 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
140 return sb_dqopt(sb)->flags &
141 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
144 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
146 return sb_dqopt(sb)->flags &
147 dquot_state_flag(DQUOT_SUSPENDED, type);
150 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
152 return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED);
155 /* Does kernel know about any quota information for given sb + type? */
156 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
158 /* Currently if anything is on, then quota usage is on as well */
159 return sb_has_quota_usage_enabled(sb, type);
162 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
164 return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED);
167 static inline bool sb_has_quota_active(struct super_block *sb, int type)
169 return sb_has_quota_loaded(sb, type) &&
170 !sb_has_quota_suspended(sb, type);
174 * Operations supported for diskquotas.
176 extern const struct dquot_operations dquot_operations;
177 extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
181 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
186 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
191 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
196 static inline int sb_any_quota_suspended(struct super_block *sb)
201 /* Does kernel know about any quota information for given sb + type? */
202 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
207 static inline int sb_any_quota_loaded(struct super_block *sb)
212 static inline int sb_has_quota_active(struct super_block *sb, int type)
217 static inline int dquot_initialize(struct inode *inode)
222 static inline bool dquot_initialize_needed(struct inode *inode)
227 static inline void dquot_drop(struct inode *inode)
231 static inline int dquot_alloc_inode(struct inode *inode)
236 static inline void dquot_free_inode(struct inode *inode)
240 static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
245 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
248 if (!(flags & DQUOT_SPACE_RESERVE))
249 inode_add_bytes(inode, number);
253 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
256 if (!(flags & DQUOT_SPACE_RESERVE))
257 inode_sub_bytes(inode, number);
260 static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
262 inode_add_bytes(inode, number);
266 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
269 inode_sub_bytes(inode, number);
273 static inline int dquot_disable(struct super_block *sb, int type,
279 static inline int dquot_suspend(struct super_block *sb, int type)
284 static inline int dquot_resume(struct super_block *sb, int type)
289 #define dquot_file_open generic_file_open
291 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
296 #endif /* CONFIG_QUOTA */
298 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
300 return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
303 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
305 __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
306 mark_inode_dirty_sync(inode);
309 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
313 ret = dquot_alloc_space_nodirty(inode, nr);
316 * Mark inode fully dirty. Since we are allocating blocks, inode
317 * would become fully dirty soon anyway and it reportedly
318 * reduces lock contention.
320 mark_inode_dirty(inode);
325 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
327 return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
330 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
332 dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
335 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
337 return dquot_alloc_space(inode, nr << inode->i_blkbits);
340 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
342 return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
345 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
349 ret = dquot_prealloc_block_nodirty(inode, nr);
351 mark_inode_dirty_sync(inode);
355 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
357 return __dquot_alloc_space(inode, nr << inode->i_blkbits,
358 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
361 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
365 ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
367 mark_inode_dirty_sync(inode);
371 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
373 dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
374 mark_inode_dirty_sync(inode);
377 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
379 __dquot_free_space(inode, nr, 0);
382 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
384 dquot_free_space_nodirty(inode, nr);
385 mark_inode_dirty_sync(inode);
388 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
390 dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
393 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
395 dquot_free_space(inode, nr << inode->i_blkbits);
398 static inline void dquot_release_reservation_block(struct inode *inode,
401 __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
404 unsigned int qtype_enforce_flag(int type);
406 #endif /* _LINUX_QUOTAOPS_ */