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
OCFS2_DQUOT(struct dquot * dquot)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);
ocfs2_sync_dquot(struct dquot * dquot)99 static inline int ocfs2_sync_dquot(struct dquot *dquot)
100 {
101 return __ocfs2_sync_dquot(dquot, 0);
102 }
ocfs2_global_release_dquot(struct dquot * dquot)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