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/* Number of quota types we support */ 21#define OCFS2_MAXQUOTAS 2 22 23/* 24 * In-memory structures 25 */ 26struct ocfs2_dquot { 27 struct dquot dq_dquot; /* Generic VFS dquot */ 28 loff_t dq_local_off; /* Offset in the local quota file */ 29 u64 dq_local_phys_blk; /* Physical block carrying quota structure */ 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 struct llist_node list; /* Member of list of dquots to drop */ 35}; 36 37/* Description of one chunk to recover in memory */ 38struct ocfs2_recovery_chunk { 39 struct list_head rc_list; /* List of chunks */ 40 int rc_chunk; /* Chunk number */ 41 unsigned long *rc_bitmap; /* Bitmap of entries to recover */ 42}; 43 44struct ocfs2_quota_recovery { 45 struct list_head r_list[OCFS2_MAXQUOTAS]; /* List of chunks to recover */ 46}; 47 48/* In-memory structure with quota header information */ 49struct ocfs2_mem_dqinfo { 50 unsigned int dqi_type; /* Quota type this structure describes */ 51 unsigned int dqi_flags; /* Flags OLQF_* */ 52 unsigned int dqi_chunks; /* Number of chunks in local quota file */ 53 unsigned int dqi_blocks; /* Number of blocks allocated for local quota file */ 54 unsigned int dqi_syncms; /* How often should we sync with other nodes */ 55 struct list_head dqi_chunk; /* List of chunks */ 56 struct inode *dqi_gqinode; /* Global quota file inode */ 57 struct ocfs2_lock_res dqi_gqlock; /* Lock protecting quota information structure */ 58 struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */ 59 int dqi_gqi_count; /* Number of holders of dqi_gqi_bh */ 60 u64 dqi_giblk; /* Number of block with global information header */ 61 struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */ 62 struct buffer_head *dqi_libh; /* Buffer with local information header */ 63 struct qtree_mem_dqinfo dqi_gi; /* Info about global file */ 64 struct delayed_work dqi_sync_work; /* Work for syncing dquots */ 65 struct ocfs2_quota_recovery *dqi_rec; /* Pointer to recovery 66 * information, in case we 67 * enable quotas on file 68 * needing it */ 69}; 70 71static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot) 72{ 73 return container_of(dquot, struct ocfs2_dquot, dq_dquot); 74} 75 76struct ocfs2_quota_chunk { 77 struct list_head qc_chunk; /* List of quotafile chunks */ 78 int qc_num; /* Number of quota chunk */ 79 struct buffer_head *qc_headerbh; /* Buffer head with chunk header */ 80}; 81 82extern struct kmem_cache *ocfs2_dquot_cachep; 83extern struct kmem_cache *ocfs2_qf_chunk_cachep; 84 85extern struct qtree_fmt_operations ocfs2_global_ops; 86 87struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery( 88 struct ocfs2_super *osb, int slot_num); 89int ocfs2_finish_quota_recovery(struct ocfs2_super *osb, 90 struct ocfs2_quota_recovery *rec, 91 int slot_num); 92void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec); 93ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, 94 size_t len, loff_t off); 95ssize_t ocfs2_quota_write(struct super_block *sb, int type, 96 const char *data, size_t len, loff_t off); 97int ocfs2_global_read_info(struct super_block *sb, int type); 98int ocfs2_global_write_info(struct super_block *sb, int type); 99int ocfs2_global_read_dquot(struct dquot *dquot); 100int __ocfs2_sync_dquot(struct dquot *dquot, int freeing); 101static inline int ocfs2_sync_dquot(struct dquot *dquot) 102{ 103 return __ocfs2_sync_dquot(dquot, 0); 104} 105static inline int ocfs2_global_release_dquot(struct dquot *dquot) 106{ 107 return __ocfs2_sync_dquot(dquot, 1); 108} 109 110int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); 111void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); 112int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh); 113int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block, 114 struct buffer_head **bh); 115int ocfs2_create_local_dquot(struct dquot *dquot); 116int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot); 117int ocfs2_local_write_dquot(struct dquot *dquot); 118void ocfs2_drop_dquot_refs(struct work_struct *work); 119 120extern const struct dquot_operations ocfs2_quota_operations; 121extern struct quota_format_type ocfs2_quota_format; 122 123#endif /* _OCFS2_QUOTA_H */ 124