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 }; 32 33 /* Description of one chunk to recover in memory */ 34 struct ocfs2_recovery_chunk { 35 struct list_head rc_list; /* List of chunks */ 36 int rc_chunk; /* Chunk number */ 37 unsigned long *rc_bitmap; /* Bitmap of entries to recover */ 38 }; 39 40 struct ocfs2_quota_recovery { 41 struct list_head r_list[MAXQUOTAS]; /* List of chunks to recover */ 42 }; 43 44 /* In-memory structure with quota header information */ 45 struct ocfs2_mem_dqinfo { 46 unsigned int dqi_type; /* Quota type this structure describes */ 47 unsigned int dqi_chunks; /* Number of chunks in local quota file */ 48 unsigned int dqi_blocks; /* Number of blocks allocated for local quota file */ 49 unsigned int dqi_syncms; /* How often should we sync with other nodes */ 50 struct list_head dqi_chunk; /* List of chunks */ 51 struct inode *dqi_gqinode; /* Global quota file inode */ 52 struct ocfs2_lock_res dqi_gqlock; /* Lock protecting quota information structure */ 53 struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */ 54 int dqi_gqi_count; /* Number of holders of dqi_gqi_bh */ 55 u64 dqi_giblk; /* Number of block with global information header */ 56 struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */ 57 struct buffer_head *dqi_libh; /* Buffer with local information header */ 58 struct qtree_mem_dqinfo dqi_gi; /* Info about global file */ 59 struct delayed_work dqi_sync_work; /* Work for syncing dquots */ 60 struct ocfs2_quota_recovery *dqi_rec; /* Pointer to recovery 61 * information, in case we 62 * enable quotas on file 63 * needing it */ 64 }; 65 66 static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot) 67 { 68 return container_of(dquot, struct ocfs2_dquot, dq_dquot); 69 } 70 71 struct ocfs2_quota_chunk { 72 struct list_head qc_chunk; /* List of quotafile chunks */ 73 int qc_num; /* Number of quota chunk */ 74 struct buffer_head *qc_headerbh; /* Buffer head with chunk header */ 75 }; 76 77 extern struct kmem_cache *ocfs2_dquot_cachep; 78 extern struct kmem_cache *ocfs2_qf_chunk_cachep; 79 80 extern struct qtree_fmt_operations ocfs2_global_ops; 81 82 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery( 83 struct ocfs2_super *osb, int slot_num); 84 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb, 85 struct ocfs2_quota_recovery *rec, 86 int slot_num); 87 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec); 88 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, 89 size_t len, loff_t off); 90 ssize_t ocfs2_quota_write(struct super_block *sb, int type, 91 const char *data, size_t len, loff_t off); 92 int ocfs2_global_read_info(struct super_block *sb, int type); 93 int ocfs2_global_write_info(struct super_block *sb, int type); 94 int ocfs2_global_read_dquot(struct dquot *dquot); 95 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing); 96 static inline int ocfs2_sync_dquot(struct dquot *dquot) 97 { 98 return __ocfs2_sync_dquot(dquot, 0); 99 } 100 static inline int ocfs2_global_release_dquot(struct dquot *dquot) 101 { 102 return __ocfs2_sync_dquot(dquot, 1); 103 } 104 105 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); 106 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); 107 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh); 108 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block, 109 struct buffer_head **bh); 110 int ocfs2_create_local_dquot(struct dquot *dquot); 111 int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot); 112 int ocfs2_local_write_dquot(struct dquot *dquot); 113 114 extern const struct dquot_operations ocfs2_quota_operations; 115 extern struct quota_format_type ocfs2_quota_format; 116 117 int ocfs2_quota_setup(void); 118 void ocfs2_quota_shutdown(void); 119 120 #endif /* _OCFS2_QUOTA_H */ 121