Root/fs/ocfs2/quota.h

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

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