1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * quota.h for OCFS2 4 * 5 * On disk quota structures for local and global quota file, in-memory 6 * structures. 7 * 8 */ 9 10 #ifndef _OCFS2_QUOTA_H 11 #define _OCFS2_QUOTA_H 12 13 #include <linux/types.h> 14 #include <linux/slab.h> 15 #include <linux/quota.h> 16 #include <linux/list.h> 17 #include <linux/dqblk_qtree.h> 18 19 #include "ocfs2.h" 20 21 /* Number of quota types we support */ 22 #define OCFS2_MAXQUOTAS 2 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 u64 dq_local_phys_blk; /* Physical block carrying quota structure */ 31 struct ocfs2_quota_chunk *dq_chunk; /* Chunk dquot is in */ 32 unsigned int dq_use_count; /* Number of nodes having reference to this entry in global quota file */ 33 s64 dq_origspace; /* Last globally synced space usage */ 34 s64 dq_originodes; /* Last globally synced inode usage */ 35 struct llist_node list; /* Member of list of dquots to drop */ 36 }; 37 38 /* Description of one chunk to recover in memory */ 39 struct ocfs2_recovery_chunk { 40 struct list_head rc_list; /* List of chunks */ 41 int rc_chunk; /* Chunk number */ 42 unsigned long *rc_bitmap; /* Bitmap of entries to recover */ 43 }; 44 45 struct ocfs2_quota_recovery { 46 struct list_head r_list[OCFS2_MAXQUOTAS]; /* List of chunks to recover */ 47 }; 48 49 /* In-memory structure with quota header information */ 50 struct ocfs2_mem_dqinfo { 51 unsigned int dqi_type; /* Quota type this structure describes */ 52 unsigned int dqi_flags; /* Flags OLQF_* */ 53 unsigned int dqi_chunks; /* Number of chunks in local quota file */ 54 unsigned int dqi_blocks; /* Number of blocks allocated for local quota file */ 55 unsigned int dqi_syncms; /* How often should we sync with other nodes */ 56 struct list_head dqi_chunk; /* List of chunks */ 57 struct inode *dqi_gqinode; /* Global quota file inode */ 58 struct ocfs2_lock_res dqi_gqlock; /* Lock protecting quota information structure */ 59 struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */ 60 int dqi_gqi_count; /* Number of holders of dqi_gqi_bh */ 61 u64 dqi_giblk; /* Number of block with global information header */ 62 struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */ 63 struct buffer_head *dqi_libh; /* Buffer with local information header */ 64 struct qtree_mem_dqinfo dqi_gi; /* Info about global file */ 65 struct delayed_work dqi_sync_work; /* Work for syncing dquots */ 66 struct ocfs2_quota_recovery *dqi_rec; /* Pointer to recovery 67 * information, in case we 68 * enable quotas on file 69 * needing it */ 70 }; 71 72 static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot) 73 { 74 return container_of(dquot, struct ocfs2_dquot, dq_dquot); 75 } 76 77 struct ocfs2_quota_chunk { 78 struct list_head qc_chunk; /* List of quotafile chunks */ 79 int qc_num; /* Number of quota chunk */ 80 struct buffer_head *qc_headerbh; /* Buffer head with chunk header */ 81 }; 82 83 extern struct kmem_cache *ocfs2_dquot_cachep; 84 extern struct kmem_cache *ocfs2_qf_chunk_cachep; 85 86 extern const struct qtree_fmt_operations ocfs2_global_ops; 87 88 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery( 89 struct ocfs2_super *osb, int slot_num); 90 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb, 91 struct ocfs2_quota_recovery *rec, 92 int slot_num); 93 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec); 94 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, 95 size_t len, loff_t off); 96 ssize_t ocfs2_quota_write(struct super_block *sb, int type, 97 const char *data, size_t len, loff_t off); 98 int ocfs2_global_read_info(struct super_block *sb, int type); 99 int ocfs2_global_write_info(struct super_block *sb, int type); 100 int ocfs2_global_read_dquot(struct dquot *dquot); 101 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing); 102 static inline int ocfs2_sync_dquot(struct dquot *dquot) 103 { 104 return __ocfs2_sync_dquot(dquot, 0); 105 } 106 static inline int ocfs2_global_release_dquot(struct dquot *dquot) 107 { 108 return __ocfs2_sync_dquot(dquot, 1); 109 } 110 111 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); 112 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); 113 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh); 114 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block, 115 struct buffer_head **bh); 116 int ocfs2_create_local_dquot(struct dquot *dquot); 117 int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot); 118 int ocfs2_local_write_dquot(struct dquot *dquot); 119 void ocfs2_drop_dquot_refs(struct work_struct *work); 120 121 extern const struct dquot_operations ocfs2_quota_operations; 122 extern struct quota_format_type ocfs2_quota_format; 123 124 #endif /* _OCFS2_QUOTA_H */ 125