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 && ia->ia_size != inode->i_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);
57 void dqput(struct dquot *dquot);
58 int dquot_scan_active(struct super_block *sb,
59 int (*fn)(struct dquot *dquot, unsigned long priv),
61 struct dquot *dquot_alloc(struct super_block *sb, int type);
62 void dquot_destroy(struct dquot *dquot);
64 int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags);
65 void __dquot_free_space(struct inode *inode, qsize_t number, int flags);
67 int dquot_alloc_inode(struct inode *inode);
69 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
70 void dquot_free_inode(struct inode *inode);
71 void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number);
73 int dquot_disable(struct super_block *sb, int type, unsigned int flags);
74 /* Suspend quotas on remount RO */
75 static inline int dquot_suspend(struct super_block *sb, int type)
77 return dquot_disable(sb, type, DQUOT_SUSPENDED);
79 int dquot_resume(struct super_block *sb, int type);
81 int dquot_commit(struct dquot *dquot);
82 int dquot_acquire(struct dquot *dquot);
83 int dquot_release(struct dquot *dquot);
84 int dquot_commit_info(struct super_block *sb, int type);
85 int dquot_get_next_id(struct super_block *sb, struct kqid *qid);
86 int dquot_mark_dquot_dirty(struct dquot *dquot);
88 int dquot_file_open(struct inode *inode, struct file *file);
90 int dquot_enable(struct inode *inode, int type, int format_id,
92 int dquot_quota_on(struct super_block *sb, int type, int format_id,
93 const struct path *path);
94 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
95 int format_id, int type);
96 int dquot_quota_off(struct super_block *sb, int type);
97 int dquot_writeback_dquots(struct super_block *sb, int type);
98 int dquot_quota_sync(struct super_block *sb, int type);
99 int dquot_get_state(struct super_block *sb, struct qc_state *state);
100 int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii);
101 int dquot_get_dqblk(struct super_block *sb, struct kqid id,
102 struct qc_dqblk *di);
103 int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id,
104 struct qc_dqblk *di);
105 int dquot_set_dqblk(struct super_block *sb, struct kqid id,
106 struct qc_dqblk *di);
108 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
109 int dquot_transfer(struct inode *inode, struct iattr *iattr);
111 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
113 return sb_dqopt(sb)->info + type;
117 * Functions for checking status of quota
120 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
122 return sb_dqopt(sb)->flags &
123 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
126 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
128 return sb_dqopt(sb)->flags &
129 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
132 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
134 return sb_dqopt(sb)->flags &
135 dquot_state_flag(DQUOT_SUSPENDED, type);
138 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
140 return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED);
143 /* Does kernel know about any quota information for given sb + type? */
144 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
146 /* Currently if anything is on, then quota usage is on as well */
147 return sb_has_quota_usage_enabled(sb, type);
150 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
152 return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED);
155 static inline bool sb_has_quota_active(struct super_block *sb, int type)
157 return sb_has_quota_loaded(sb, type) &&
158 !sb_has_quota_suspended(sb, type);
162 * Operations supported for diskquotas.
164 extern const struct dquot_operations dquot_operations;
165 extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
169 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
174 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
179 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
184 static inline int sb_any_quota_suspended(struct super_block *sb)
189 /* Does kernel know about any quota information for given sb + type? */
190 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
195 static inline int sb_any_quota_loaded(struct super_block *sb)
200 static inline int sb_has_quota_active(struct super_block *sb, int type)
205 static inline int dquot_initialize(struct inode *inode)
210 static inline bool dquot_initialize_needed(struct inode *inode)
215 static inline void dquot_drop(struct inode *inode)
219 static inline int dquot_alloc_inode(struct inode *inode)
224 static inline void dquot_free_inode(struct inode *inode)
228 static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
233 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
236 if (!(flags & DQUOT_SPACE_RESERVE))
237 inode_add_bytes(inode, number);
241 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
244 if (!(flags & DQUOT_SPACE_RESERVE))
245 inode_sub_bytes(inode, number);
248 static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
250 inode_add_bytes(inode, number);
254 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
257 inode_sub_bytes(inode, number);
261 static inline int dquot_disable(struct super_block *sb, int type,
267 static inline int dquot_suspend(struct super_block *sb, int type)
272 static inline int dquot_resume(struct super_block *sb, int type)
277 #define dquot_file_open generic_file_open
279 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
284 #endif /* CONFIG_QUOTA */
286 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
288 return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
291 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
293 __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
294 mark_inode_dirty_sync(inode);
297 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
301 ret = dquot_alloc_space_nodirty(inode, nr);
304 * Mark inode fully dirty. Since we are allocating blocks, inode
305 * would become fully dirty soon anyway and it reportedly
306 * reduces lock contention.
308 mark_inode_dirty(inode);
313 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
315 return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
318 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
320 dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
323 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
325 return dquot_alloc_space(inode, nr << inode->i_blkbits);
328 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
330 return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
333 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
337 ret = dquot_prealloc_block_nodirty(inode, nr);
339 mark_inode_dirty_sync(inode);
343 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
345 return __dquot_alloc_space(inode, nr << inode->i_blkbits,
346 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
349 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
353 ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
355 mark_inode_dirty_sync(inode);
359 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
361 dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
362 mark_inode_dirty_sync(inode);
365 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
367 __dquot_free_space(inode, nr, 0);
370 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
372 dquot_free_space_nodirty(inode, nr);
373 mark_inode_dirty_sync(inode);
376 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
378 dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
381 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
383 dquot_free_space(inode, nr << inode->i_blkbits);
386 static inline void dquot_release_reservation_block(struct inode *inode,
389 __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
392 unsigned int qtype_enforce_flag(int type);
394 #endif /* _LINUX_QUOTAOPS_ */