1 /* 2 * quota.h for OCFS2 3 * 4 * On disk quota structures for local and global quota file, in-memory 5 * structures. 6 * 7 */ 8 9 #ifndef _OCFS2_QUOTA_H 10 #define _OCFS2_QUOTA_H 11 12 #include <linux/types.h> 13 #include <linux/slab.h> 14 #include <linux/quota.h> 15 #include <linux/list.h> 16 #include <linux/dqblk_qtree.h> 17 18 #include "ocfs2.h" 19 20 /* 21 * In-memory structures 22 */ 23 struct ocfs2_dquot { 24 struct dquot dq_dquot; /* Generic VFS dquot */ 25 loff_t dq_local_off; /* Offset in the local quota file */ 26 u64 dq_local_phys_blk; /* Physical block carrying quota structure */ 27 struct ocfs2_quota_chunk *dq_chunk; /* Chunk dquot is in */ 28 unsigned int dq_use_count; /* Number of nodes having reference to this entry in global quota file */ 29 s64 dq_origspace; /* Last globally synced space usage */ 30 s64 dq_originodes; /* Last globally synced inode usage */ 31 struct llist_node list; /* Member of list of dquots to drop */ 32 }; 33 34 /* Description of one chunk to recover in memory */ 35 struct ocfs2_recovery_chunk { 36 struct list_head rc_list; /* List of chunks */ 37 int rc_chunk; /* Chunk number */ 38 unsigned long *rc_bitmap; /* Bitmap of entries to recover */ 39 }; 40 41 struct ocfs2_quota_recovery { 42 struct list_head r_list[MAXQUOTAS]; /* List of chunks to recover */ 43 }; 44 45 /* In-memory structure with quota header information */ 46 struct ocfs2_mem_dqinfo { 47 unsigned int dqi_type; /* Quota type this structure describes */ 48 unsigned int dqi_chunks; /* Number of chunks in local quota file */ 49 unsigned int dqi_blocks; /* Number of blocks allocated for local quota file */ 50 unsigned int dqi_syncms; /* How often should we sync with other nodes */ 51 struct list_head dqi_chunk; /* List of chunks */ 52 struct inode *dqi_gqinode; /* Global quota file inode */ 53 struct ocfs2_lock_res dqi_gqlock; /* Lock protecting quota information structure */ 54 struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */ 55 int dqi_gqi_count; /* Number of holders of dqi_gqi_bh */ 56 u64 dqi_giblk; /* Number of block with global information header */ 57 struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */ 58 struct buffer_head *dqi_libh; /* Buffer with local information header */ 59 struct qtree_mem_dqinfo dqi_gi; /* Info about global file */ 60 struct delayed_work dqi_sync_work; /* Work for syncing dquots */ 61 struct ocfs2_quota_recovery *dqi_rec; /* Pointer to recovery 62 * information, in case we 63 * enable quotas on file 64 * needing it */ 65 }; 66 67 static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot) 68 { 69 return container_of(dquot, struct ocfs2_dquot, dq_dquot); 70 } 71 72 struct ocfs2_quota_chunk { 73 struct list_head qc_chunk; /* List of quotafile chunks */ 74 int qc_num; /* Number of quota chunk */ 75 struct buffer_head *qc_headerbh; /* Buffer head with chunk header */ 76 }; 77 78 extern struct kmem_cache *ocfs2_dquot_cachep; 79 extern struct kmem_cache *ocfs2_qf_chunk_cachep; 80 81 extern struct qtree_fmt_operations ocfs2_global_ops; 82 83 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery( 84 struct ocfs2_super *osb, int slot_num); 85 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb, 86 struct ocfs2_quota_recovery *rec, 87 int slot_num); 88 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec); 89 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, 90 size_t len, loff_t off); 91 ssize_t ocfs2_quota_write(struct super_block *sb, int type, 92 const char *data, size_t len, loff_t off); 93 int ocfs2_global_read_info(struct super_block *sb, int type); 94 int ocfs2_global_write_info(struct super_block *sb, int type); 95 int ocfs2_global_read_dquot(struct dquot *dquot); 96 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing); 97 static inline int ocfs2_sync_dquot(struct dquot *dquot) 98 { 99 return __ocfs2_sync_dquot(dquot, 0); 100 } 101 static inline int ocfs2_global_release_dquot(struct dquot *dquot) 102 { 103 return __ocfs2_sync_dquot(dquot, 1); 104 } 105 106 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); 107 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); 108 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh); 109 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block, 110 struct buffer_head **bh); 111 int ocfs2_create_local_dquot(struct dquot *dquot); 112 int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot); 113 int ocfs2_local_write_dquot(struct dquot *dquot); 114 void ocfs2_drop_dquot_refs(struct work_struct *work); 115 116 extern const struct dquot_operations ocfs2_quota_operations; 117 extern struct quota_format_type ocfs2_quota_format; 118 119 #endif /* _OCFS2_QUOTA_H */ 120