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 /* 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 user_namespace *mnt_userns,
                      struct inode *inode, struct iattr *ia)
 {
     return ((ia->ia_valid & ATTR_SIZE) ||
         i_uid_needs_update(mnt_userns, ia, inode) ||
         i_gid_needs_update(mnt_userns, ia, inode));
 }
 
 #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 user_namespace *mnt_userns, 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 user_namespace *mnt_userns,
                  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_ */

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