| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Definitions for diskquota-operations. When diskquota is configured these |
| * macros expand to the right source-code. |
| * |
| * Author: Marco van Wieringen <mvw@planets.elm.net> |
| */ |
| #ifndef _LINUX_QUOTAOPS_ |
| #define _LINUX_QUOTAOPS_ |
| |
| #include <linux/fs.h> |
| |
| #define DQUOT_SPACE_WARN 0x1 |
| #define DQUOT_SPACE_RESERVE 0x2 |
| #define DQUOT_SPACE_NOFAIL 0x4 |
| |
| static inline struct quota_info *sb_dqopt(struct super_block *sb) |
| { |
| return &sb->s_dquot; |
| } |
| |
| /* i_mutex must being held */ |
| static inline bool is_quota_modification(struct inode *inode, struct iattr *ia) |
| { |
| return (ia->ia_valid & ATTR_SIZE) || |
| (ia->ia_valid & ATTR_UID && !uid_eq(ia->ia_uid, inode->i_uid)) || |
| (ia->ia_valid & ATTR_GID && !gid_eq(ia->ia_gid, inode->i_gid)); |
| } |
| |
| #if defined(CONFIG_QUOTA) |
| |
| #define quota_error(sb, fmt, args...) \ |
| __quota_error((sb), __func__, fmt , ## args) |
| |
| extern __printf(3, 4) |
| void __quota_error(struct super_block *sb, const char *func, |
| const char *fmt, ...); |
| |
| /* |
| * declaration of quota_function calls in kernel. |
| */ |
| int dquot_initialize(struct inode *inode); |
| bool dquot_initialize_needed(struct inode *inode); |
| void dquot_drop(struct inode *inode); |
| struct dquot *dqget(struct super_block *sb, struct kqid qid); |
| static inline struct dquot *dqgrab(struct dquot *dquot) |
| { |
| /* Make sure someone else has active reference to dquot */ |
| WARN_ON_ONCE(!atomic_read(&dquot->dq_count)); |
| WARN_ON_ONCE(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)); |
| atomic_inc(&dquot->dq_count); |
| return dquot; |
| } |
| |
| static inline bool dquot_is_busy(struct dquot *dquot) |
| { |
| if (test_bit(DQ_MOD_B, &dquot->dq_flags)) |
| return true; |
| if (atomic_read(&dquot->dq_count) > 1) |
| return true; |
| return false; |
| } |
| |
| void dqput(struct dquot *dquot); |
| int dquot_scan_active(struct super_block *sb, |
| int (*fn)(struct dquot *dquot, unsigned long priv), |
| unsigned long priv); |
| struct dquot *dquot_alloc(struct super_block *sb, int type); |
| void dquot_destroy(struct dquot *dquot); |
| |
| int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags); |
| void __dquot_free_space(struct inode *inode, qsize_t number, int flags); |
| |
| int dquot_alloc_inode(struct inode *inode); |
| |
| int dquot_claim_space_nodirty(struct inode *inode, qsize_t number); |
| void dquot_free_inode(struct inode *inode); |
| void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number); |
| |
| int dquot_disable(struct super_block *sb, int type, unsigned int flags); |
| /* Suspend quotas on remount RO */ |
| static inline int dquot_suspend(struct super_block *sb, int type) |
| { |
| return dquot_disable(sb, type, DQUOT_SUSPENDED); |
| } |
| int dquot_resume(struct super_block *sb, int type); |
| |
| int dquot_commit(struct dquot *dquot); |
| int dquot_acquire(struct dquot *dquot); |
| int dquot_release(struct dquot *dquot); |
| int dquot_commit_info(struct super_block *sb, int type); |
| int dquot_get_next_id(struct super_block *sb, struct kqid *qid); |
| int dquot_mark_dquot_dirty(struct dquot *dquot); |
| |
| int dquot_file_open(struct inode *inode, struct file *file); |
| |
| int dquot_load_quota_sb(struct super_block *sb, int type, int format_id, |
| unsigned int flags); |
| int dquot_load_quota_inode(struct inode *inode, int type, int format_id, |
| unsigned int flags); |
| int dquot_quota_on(struct super_block *sb, int type, int format_id, |
| const struct path *path); |
| int dquot_quota_on_mount(struct super_block *sb, char *qf_name, |
| int format_id, int type); |
| int dquot_quota_off(struct super_block *sb, int type); |
| int dquot_writeback_dquots(struct super_block *sb, int type); |
| int dquot_quota_sync(struct super_block *sb, int type); |
| int dquot_get_state(struct super_block *sb, struct qc_state *state); |
| int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii); |
| int dquot_get_dqblk(struct super_block *sb, struct kqid id, |
| struct qc_dqblk *di); |
| int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id, |
| struct qc_dqblk *di); |
| int dquot_set_dqblk(struct super_block *sb, struct kqid id, |
| struct qc_dqblk *di); |
| |
| int __dquot_transfer(struct inode *inode, struct dquot **transfer_to); |
| int dquot_transfer(struct inode *inode, struct iattr *iattr); |
| |
| static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type) |
| { |
| return sb_dqopt(sb)->info + type; |
| } |
| |
| /* |
| * Functions for checking status of quota |
| */ |
| |
| static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type) |
| { |
| return sb_dqopt(sb)->flags & |
| dquot_state_flag(DQUOT_USAGE_ENABLED, type); |
| } |
| |
| static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type) |
| { |
| return sb_dqopt(sb)->flags & |
| dquot_state_flag(DQUOT_LIMITS_ENABLED, type); |
| } |
| |
| static inline bool sb_has_quota_suspended(struct super_block *sb, int type) |
| { |
| return sb_dqopt(sb)->flags & |
| dquot_state_flag(DQUOT_SUSPENDED, type); |
| } |
| |
| static inline unsigned sb_any_quota_suspended(struct super_block *sb) |
| { |
| return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED); |
| } |
| |
| /* Does kernel know about any quota information for given sb + type? */ |
| static inline bool sb_has_quota_loaded(struct super_block *sb, int type) |
| { |
| /* Currently if anything is on, then quota usage is on as well */ |
| return sb_has_quota_usage_enabled(sb, type); |
| } |
| |
| static inline unsigned sb_any_quota_loaded(struct super_block *sb) |
| { |
| return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED); |
| } |
| |
| static inline bool sb_has_quota_active(struct super_block *sb, int type) |
| { |
| return sb_has_quota_loaded(sb, type) && |
| !sb_has_quota_suspended(sb, type); |
| } |
| |
| /* |
| * Operations supported for diskquotas. |
| */ |
| extern const struct dquot_operations dquot_operations; |
| extern const struct quotactl_ops dquot_quotactl_sysfile_ops; |
| |
| #else |
| |
| static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type) |
| { |
| return 0; |
| } |
| |
| static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type) |
| { |
| return 0; |
| } |
| |
| static inline int sb_has_quota_suspended(struct super_block *sb, int type) |
| { |
| return 0; |
| } |
| |
| static inline int sb_any_quota_suspended(struct super_block *sb) |
| { |
| return 0; |
| } |
| |
| /* Does kernel know about any quota information for given sb + type? */ |
| static inline int sb_has_quota_loaded(struct super_block *sb, int type) |
| { |
| return 0; |
| } |
| |
| static inline int sb_any_quota_loaded(struct super_block *sb) |
| { |
| return 0; |
| } |
| |
| static inline int sb_has_quota_active(struct super_block *sb, int type) |
| { |
| return 0; |
| } |
| |
| static inline int dquot_initialize(struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline bool dquot_initialize_needed(struct inode *inode) |
| { |
| return false; |
| } |
| |
| static inline void dquot_drop(struct inode *inode) |
| { |
| } |
| |
| static inline int dquot_alloc_inode(struct inode *inode) |
| { |
| return 0; |
| } |
| |
| static inline void dquot_free_inode(struct inode *inode) |
| { |
| } |
| |
| static inline int dquot_transfer(struct inode *inode, struct iattr *iattr) |
| { |
| return 0; |
| } |
| |
| static inline int __dquot_alloc_space(struct inode *inode, qsize_t number, |
| int flags) |
| { |
| if (!(flags & DQUOT_SPACE_RESERVE)) |
| inode_add_bytes(inode, number); |
| return 0; |
| } |
| |
| static inline void __dquot_free_space(struct inode *inode, qsize_t number, |
| int flags) |
| { |
| if (!(flags & DQUOT_SPACE_RESERVE)) |
| inode_sub_bytes(inode, number); |
| } |
| |
| static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) |
| { |
| inode_add_bytes(inode, number); |
| return 0; |
| } |
| |
| static inline int dquot_reclaim_space_nodirty(struct inode *inode, |
| qsize_t number) |
| { |
| inode_sub_bytes(inode, number); |
| return 0; |
| } |
| |
| static inline int dquot_disable(struct super_block *sb, int type, |
| unsigned int flags) |
| { |
| return 0; |
| } |
| |
| static inline int dquot_suspend(struct super_block *sb, int type) |
| { |
| return 0; |
| } |
| |
| static inline int dquot_resume(struct super_block *sb, int type) |
| { |
| return 0; |
| } |
| |
| #define dquot_file_open generic_file_open |
| |
| static inline int dquot_writeback_dquots(struct super_block *sb, int type) |
| { |
| return 0; |
| } |
| |
| #endif /* CONFIG_QUOTA */ |
| |
| static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr) |
| { |
| return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN); |
| } |
| |
| static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr) |
| { |
| __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL); |
| mark_inode_dirty_sync(inode); |
| } |
| |
| static inline int dquot_alloc_space(struct inode *inode, qsize_t nr) |
| { |
| int ret; |
| |
| ret = dquot_alloc_space_nodirty(inode, nr); |
| if (!ret) { |
| /* |
| * Mark inode fully dirty. Since we are allocating blocks, inode |
| * would become fully dirty soon anyway and it reportedly |
| * reduces lock contention. |
| */ |
| mark_inode_dirty(inode); |
| } |
| return ret; |
| } |
| |
| static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr) |
| { |
| return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits); |
| } |
| |
| static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr) |
| { |
| dquot_alloc_space_nofail(inode, nr << inode->i_blkbits); |
| } |
| |
| static inline int dquot_alloc_block(struct inode *inode, qsize_t nr) |
| { |
| return dquot_alloc_space(inode, nr << inode->i_blkbits); |
| } |
| |
| static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr) |
| { |
| return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0); |
| } |
| |
| static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr) |
| { |
| int ret; |
| |
| ret = dquot_prealloc_block_nodirty(inode, nr); |
| if (!ret) |
| mark_inode_dirty_sync(inode); |
| return ret; |
| } |
| |
| static inline int dquot_reserve_block(struct inode *inode, qsize_t nr) |
| { |
| return __dquot_alloc_space(inode, nr << inode->i_blkbits, |
| DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE); |
| } |
| |
| static inline int dquot_claim_block(struct inode *inode, qsize_t nr) |
| { |
| int ret; |
| |
| ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits); |
| if (!ret) |
| mark_inode_dirty_sync(inode); |
| return ret; |
| } |
| |
| static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr) |
| { |
| dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits); |
| mark_inode_dirty_sync(inode); |
| } |
| |
| static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr) |
| { |
| __dquot_free_space(inode, nr, 0); |
| } |
| |
| static inline void dquot_free_space(struct inode *inode, qsize_t nr) |
| { |
| dquot_free_space_nodirty(inode, nr); |
| mark_inode_dirty_sync(inode); |
| } |
| |
| static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr) |
| { |
| dquot_free_space_nodirty(inode, nr << inode->i_blkbits); |
| } |
| |
| static inline void dquot_free_block(struct inode *inode, qsize_t nr) |
| { |
| dquot_free_space(inode, nr << inode->i_blkbits); |
| } |
| |
| static inline void dquot_release_reservation_block(struct inode *inode, |
| qsize_t nr) |
| { |
| __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE); |
| } |
| |
| unsigned int qtype_enforce_flag(int type); |
| |
| #endif /* _LINUX_QUOTAOPS_ */ |