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 /* Common stuff */ 21 /* id number of quota format */ 22 #define QFMT_OCFS2 3 23 24 /* 25 * In-memory structures 26 */ 27 struct ocfs2_dquot { 28 struct dquot dq_dquot; /* Generic VFS dquot */ 29 loff_t dq_local_off; /* Offset in the local quota file */ 30 struct ocfs2_quota_chunk *dq_chunk; /* Chunk dquot is in */ 31 unsigned int dq_use_count; /* Number of nodes having reference to this entry in global quota file */ 32 s64 dq_origspace; /* Last globally synced space usage */ 33 s64 dq_originodes; /* Last globally synced inode usage */ 34 }; 35 36 /* Description of one chunk to recover in memory */ 37 struct ocfs2_recovery_chunk { 38 struct list_head rc_list; /* List of chunks */ 39 int rc_chunk; /* Chunk number */ 40 unsigned long *rc_bitmap; /* Bitmap of entries to recover */ 41 }; 42 43 struct ocfs2_quota_recovery { 44 struct list_head r_list[MAXQUOTAS]; /* List of chunks to recover */ 45 }; 46 47 /* In-memory structure with quota header information */ 48 struct ocfs2_mem_dqinfo { 49 unsigned int dqi_type; /* Quota type this structure describes */ 50 unsigned int dqi_chunks; /* Number of chunks in local quota file */ 51 unsigned int dqi_blocks; /* Number of blocks allocated for local quota file */ 52 unsigned int dqi_syncms; /* How often should we sync with other nodes */ 53 unsigned int dqi_syncjiff; /* Precomputed dqi_syncms in jiffies */ 54 struct list_head dqi_chunk; /* List of chunks */ 55 struct inode *dqi_gqinode; /* Global quota file inode */ 56 struct ocfs2_lock_res dqi_gqlock; /* Lock protecting quota information structure */ 57 struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */ 58 int dqi_gqi_count; /* Number of holders of dqi_gqi_bh */ 59 struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */ 60 struct buffer_head *dqi_ibh; /* Buffer with information header */ 61 struct qtree_mem_dqinfo dqi_gi; /* Info about global file */ 62 struct delayed_work dqi_sync_work; /* Work for syncing dquots */ 63 struct ocfs2_quota_recovery *dqi_rec; /* Pointer to recovery 64 * information, in case we 65 * enable quotas on file 66 * needing it */ 67 }; 68 69 static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot) 70 { 71 return container_of(dquot, struct ocfs2_dquot, dq_dquot); 72 } 73 74 struct ocfs2_quota_chunk { 75 struct list_head qc_chunk; /* List of quotafile chunks */ 76 int qc_num; /* Number of quota chunk */ 77 struct buffer_head *qc_headerbh; /* Buffer head with chunk header */ 78 }; 79 80 extern struct kmem_cache *ocfs2_dquot_cachep; 81 extern struct kmem_cache *ocfs2_qf_chunk_cachep; 82 83 extern struct qtree_fmt_operations ocfs2_global_ops; 84 85 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery( 86 struct ocfs2_super *osb, int slot_num); 87 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb, 88 struct ocfs2_quota_recovery *rec, 89 int slot_num); 90 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec); 91 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, 92 size_t len, loff_t off); 93 ssize_t ocfs2_quota_write(struct super_block *sb, int type, 94 const char *data, size_t len, loff_t off); 95 int ocfs2_global_read_info(struct super_block *sb, int type); 96 int ocfs2_global_write_info(struct super_block *sb, int type); 97 int ocfs2_global_read_dquot(struct dquot *dquot); 98 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing); 99 static inline int ocfs2_sync_dquot(struct dquot *dquot) 100 { 101 return __ocfs2_sync_dquot(dquot, 0); 102 } 103 static inline int ocfs2_global_release_dquot(struct dquot *dquot) 104 { 105 return __ocfs2_sync_dquot(dquot, 1); 106 } 107 108 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); 109 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); 110 int ocfs2_read_quota_block(struct inode *inode, u64 v_block, 111 struct buffer_head **bh); 112 113 extern struct dquot_operations ocfs2_quota_operations; 114 extern struct quota_format_type ocfs2_quota_format; 115 116 int ocfs2_quota_setup(void); 117 void ocfs2_quota_shutdown(void); 118 119 #endif /* _OCFS2_QUOTA_H */ 120