text: /*
   * 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_size != inode->i_size) ||
  		(ia->ia_valid & ATTR_UID && ia->ia_uid != inode->i_uid) ||
  		(ia->ia_valid & ATTR_GID && ia->ia_gid != inode->i_gid);
  }
  
  #if defined(CONFIG_QUOTA)
  
  #define quota_error(sb, fmt, args...) \
  	__quota_error((sb), __func__, fmt , ## args)
  
  extern void __quota_error(struct super_block *sb, const char *func,
  			 const char *fmt, ...);
  
  /*
   * declaration of quota_function calls in kernel.
   */
  void inode_add_rsv_space(struct inode *inode, qsize_t number);
  void inode_claim_rsv_space(struct inode *inode, qsize_t number);
  void inode_sub_rsv_space(struct inode *inode, qsize_t number);
  
  void dquot_initialize(struct inode *inode);
  void dquot_drop(struct inode *inode);
  struct dquot *dqget(struct super_block *sb, unsigned int id, int type);
  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(const struct inode *inode);
  
  int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
  void dquot_free_inode(const struct inode *inode);
  
  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_mark_dquot_dirty(struct dquot *dquot);
  
  int dquot_file_open(struct inode *inode, struct file *file);
  
  int dquot_quota_on(struct super_block *sb, int type, int format_id,
  	char *path);
  int dquot_enable(struct inode *inode, int type, int format_id,
  	unsigned int flags);
  int dquot_quota_on_path(struct super_block *sb, int type, int format_id,
   	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_quota_sync(struct super_block *sb, int type, int wait);
  int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  int dquot_get_dqblk(struct super_block *sb, int type, qid_t id,
  		struct fs_disk_quota *di);
  int dquot_set_dqblk(struct super_block *sb, int type, qid_t id,
  		struct fs_disk_quota *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)
  {
  	unsigned type, tmsk = 0;
  	for (type = 0; type < MAXQUOTAS; type++)
  		tmsk |= sb_has_quota_suspended(sb, type) << type;
  	return tmsk;
  }
  
  /* 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)
  {
  	unsigned type, tmsk = 0;
  	for (type = 0; type < MAXQUOTAS; type++)
  		tmsk |= sb_has_quota_loaded(sb, type) << type;
  	return	tmsk;
  }
  
  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_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 void dquot_initialize(struct inode *inode)
  {
  }
  
  static inline void dquot_drop(struct inode *inode)
  {
  }
  
  static inline int dquot_alloc_inode(const struct inode *inode)
  {
  	return 0;
  }
  
  static inline void dquot_free_inode(const 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_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
  
  #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 inode_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_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);
  }
  
  #endif /* _LINUX_QUOTAOPS_ */
  