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 struct ocfs2_quota_chunk *dq_chunk; /* Chunk dquot is in */ 27 unsigned int dq_use_count; /* Number of nodes having reference to this entry in global quota file */ 28 s64 dq_origspace; /* Last globally synced space usage */ 29 s64 dq_originodes; /* Last globally synced inode usage */ 30 }; 31 32 /* Description of one chunk to recover in memory */ 33 struct ocfs2_recovery_chunk { 34 struct list_head rc_list; /* List of chunks */ 35 int rc_chunk; /* Chunk number */ 36 unsigned long *rc_bitmap; /* Bitmap of entries to recover */ 37 }; 38 39 struct ocfs2_quota_recovery { 40 struct list_head r_list[MAXQUOTAS]; /* List of chunks to recover */ 41 }; 42 43 /* In-memory structure with quota header information */ 44 struct ocfs2_mem_dqinfo { 45 unsigned int dqi_type; /* Quota type this structure describes */ 46 unsigned int dqi_chunks; /* Number of chunks in local quota file */ 47 unsigned int dqi_blocks; /* Number of blocks allocated for local quota file */ 48 unsigned int dqi_syncms; /* How often should we sync with other nodes */ 49 struct list_head dqi_chunk; /* List of chunks */ 50 struct inode *dqi_gqinode; /* Global quota file inode */ 51 struct ocfs2_lock_res dqi_gqlock; /* Lock protecting quota information structure */ 52 struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */ 53 int dqi_gqi_count; /* Number of holders of dqi_gqi_bh */ 54 struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */ 55 struct buffer_head *dqi_ibh; /* Buffer with information header */ 56 struct qtree_mem_dqinfo dqi_gi; /* Info about global file */ 57 struct delayed_work dqi_sync_work; /* Work for syncing dquots */ 58 struct ocfs2_quota_recovery *dqi_rec; /* Pointer to recovery 59 * information, in case we 60 * enable quotas on file 61 * needing it */ 62 }; 63 64 static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot) 65 { 66 return container_of(dquot, struct ocfs2_dquot, dq_dquot); 67 } 68 69 struct ocfs2_quota_chunk { 70 struct list_head qc_chunk; /* List of quotafile chunks */ 71 int qc_num; /* Number of quota chunk */ 72 struct buffer_head *qc_headerbh; /* Buffer head with chunk header */ 73 }; 74 75 extern struct kmem_cache *ocfs2_dquot_cachep; 76 extern struct kmem_cache *ocfs2_qf_chunk_cachep; 77 78 extern struct qtree_fmt_operations ocfs2_global_ops; 79 80 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery( 81 struct ocfs2_super *osb, int slot_num); 82 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb, 83 struct ocfs2_quota_recovery *rec, 84 int slot_num); 85 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec); 86 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, 87 size_t len, loff_t off); 88 ssize_t ocfs2_quota_write(struct super_block *sb, int type, 89 const char *data, size_t len, loff_t off); 90 int ocfs2_global_read_info(struct super_block *sb, int type); 91 int ocfs2_global_write_info(struct super_block *sb, int type); 92 int ocfs2_global_read_dquot(struct dquot *dquot); 93 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing); 94 static inline int ocfs2_sync_dquot(struct dquot *dquot) 95 { 96 return __ocfs2_sync_dquot(dquot, 0); 97 } 98 static inline int ocfs2_global_release_dquot(struct dquot *dquot) 99 { 100 return __ocfs2_sync_dquot(dquot, 1); 101 } 102 103 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); 104 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); 105 int ocfs2_read_quota_block(struct inode *inode, u64 v_block, 106 struct buffer_head **bh); 107 108 extern const struct dquot_operations ocfs2_quota_operations; 109 extern struct quota_format_type ocfs2_quota_format; 110 111 int ocfs2_quota_setup(void); 112 void ocfs2_quota_shutdown(void); 113 114 #endif /* _OCFS2_QUOTA_H */ 115