/* * quota.h for OCFS2 * * On disk quota structures for local and global quota file, in-memory * structures. * */ #ifndef _OCFS2_QUOTA_H #define _OCFS2_QUOTA_H #include <linux/types.h> #include <linux/slab.h> #include <linux/quota.h> #include <linux/list.h> #include <linux/dqblk_qtree.h> #include "ocfs2.h" /* Common stuff */ /* id number of quota format */ #define QFMT_OCFS2 3 /* * In-memory structures */ struct ocfs2_dquot { struct dquot dq_dquot; /* Generic VFS dquot */ loff_t dq_local_off; /* Offset in the local quota file */ struct ocfs2_quota_chunk *dq_chunk; /* Chunk dquot is in */ unsigned int dq_use_count; /* Number of nodes having reference to this entry in global quota file */ s64 dq_origspace; /* Last globally synced space usage */ s64 dq_originodes; /* Last globally synced inode usage */ }; /* Description of one chunk to recover in memory */ struct ocfs2_recovery_chunk { struct list_head rc_list; /* List of chunks */ int rc_chunk; /* Chunk number */ unsigned long *rc_bitmap; /* Bitmap of entries to recover */ }; struct ocfs2_quota_recovery { struct list_head r_list[MAXQUOTAS]; /* List of chunks to recover */ }; /* In-memory structure with quota header information */ struct ocfs2_mem_dqinfo { unsigned int dqi_type; /* Quota type this structure describes */ unsigned int dqi_chunks; /* Number of chunks in local quota file */ unsigned int dqi_blocks; /* Number of blocks allocated for local quota file */ unsigned int dqi_syncms; /* How often should we sync with other nodes */ struct list_head dqi_chunk; /* List of chunks */ struct inode *dqi_gqinode; /* Global quota file inode */ struct ocfs2_lock_res dqi_gqlock; /* Lock protecting quota information structure */ struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */ int dqi_gqi_count; /* Number of holders of dqi_gqi_bh */ struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */ struct buffer_head *dqi_ibh; /* Buffer with information header */ struct qtree_mem_dqinfo dqi_gi; /* Info about global file */ struct delayed_work dqi_sync_work; /* Work for syncing dquots */ struct ocfs2_quota_recovery *dqi_rec; /* Pointer to recovery * information, in case we * enable quotas on file * needing it */ }; static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot) { return container_of(dquot, struct ocfs2_dquot, dq_dquot); } struct ocfs2_quota_chunk { struct list_head qc_chunk; /* List of quotafile chunks */ int qc_num; /* Number of quota chunk */ struct buffer_head *qc_headerbh; /* Buffer head with chunk header */ }; extern struct kmem_cache *ocfs2_dquot_cachep; extern struct kmem_cache *ocfs2_qf_chunk_cachep; extern struct qtree_fmt_operations ocfs2_global_ops; struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery( struct ocfs2_super *osb, int slot_num); int ocfs2_finish_quota_recovery(struct ocfs2_super *osb, struct ocfs2_quota_recovery *rec, int slot_num); void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec); ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); ssize_t ocfs2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); int ocfs2_global_read_info(struct super_block *sb, int type); int ocfs2_global_write_info(struct super_block *sb, int type); int ocfs2_global_read_dquot(struct dquot *dquot); int __ocfs2_sync_dquot(struct dquot *dquot, int freeing); static inline int ocfs2_sync_dquot(struct dquot *dquot) { return __ocfs2_sync_dquot(dquot, 0); } static inline int ocfs2_global_release_dquot(struct dquot *dquot) { return __ocfs2_sync_dquot(dquot, 1); } int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); int ocfs2_read_quota_block(struct inode *inode, u64 v_block, struct buffer_head **bh); extern const struct dquot_operations ocfs2_quota_operations; extern struct quota_format_type ocfs2_quota_format; int ocfs2_quota_setup(void); void ocfs2_quota_shutdown(void); #endif /* _OCFS2_QUOTA_H */