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quota.h
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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 #endif /* _OCFS2_QUOTA_H */
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