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Jan Kara9e33d692008-08-25 19:56:50 +02001/*
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 */
27struct 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/* In-memory structure with quota header information */
37struct ocfs2_mem_dqinfo {
38 unsigned int dqi_type; /* Quota type this structure describes */
39 unsigned int dqi_chunks; /* Number of chunks in local quota file */
40 unsigned int dqi_blocks; /* Number of blocks allocated for local quota file */
41 unsigned int dqi_syncms; /* How often should we sync with other nodes */
Mark Fasheh171bf932008-10-20 15:36:47 +020042 unsigned int dqi_syncjiff; /* Precomputed dqi_syncms in jiffies */
Jan Kara9e33d692008-08-25 19:56:50 +020043 struct list_head dqi_chunk; /* List of chunks */
44 struct inode *dqi_gqinode; /* Global quota file inode */
45 struct ocfs2_lock_res dqi_gqlock; /* Lock protecting quota information structure */
46 struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */
47 int dqi_gqi_count; /* Number of holders of dqi_gqi_bh */
48 struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */
49 struct buffer_head *dqi_ibh; /* Buffer with information header */
50 struct qtree_mem_dqinfo dqi_gi; /* Info about global file */
Mark Fasheh171bf932008-10-20 15:36:47 +020051 struct delayed_work dqi_sync_work; /* Work for syncing dquots */
Jan Kara9e33d692008-08-25 19:56:50 +020052};
53
54static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
55{
56 return container_of(dquot, struct ocfs2_dquot, dq_dquot);
57}
58
59struct ocfs2_quota_chunk {
60 struct list_head qc_chunk; /* List of quotafile chunks */
61 int qc_num; /* Number of quota chunk */
62 struct buffer_head *qc_headerbh; /* Buffer head with chunk header */
63};
64
65extern struct kmem_cache *ocfs2_dquot_cachep;
66extern struct kmem_cache *ocfs2_qf_chunk_cachep;
67
68extern struct qtree_fmt_operations ocfs2_global_ops;
69
70ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
71 size_t len, loff_t off);
72ssize_t ocfs2_quota_write(struct super_block *sb, int type,
73 const char *data, size_t len, loff_t off);
74int ocfs2_global_read_info(struct super_block *sb, int type);
75int ocfs2_global_write_info(struct super_block *sb, int type);
76int ocfs2_global_read_dquot(struct dquot *dquot);
77int __ocfs2_sync_dquot(struct dquot *dquot, int freeing);
78static inline int ocfs2_sync_dquot(struct dquot *dquot)
79{
80 return __ocfs2_sync_dquot(dquot, 0);
81}
82static inline int ocfs2_global_release_dquot(struct dquot *dquot)
83{
84 return __ocfs2_sync_dquot(dquot, 1);
85}
86
87int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
88void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
89struct buffer_head *ocfs2_read_quota_block(struct inode *inode,
90 int block, int *err);
91
92extern struct dquot_operations ocfs2_quota_operations;
93extern struct quota_format_type ocfs2_quota_format;
94
Mark Fasheh171bf932008-10-20 15:36:47 +020095int ocfs2_quota_setup(void);
96void ocfs2_quota_shutdown(void);
97
Jan Kara9e33d692008-08-25 19:56:50 +020098#endif /* _OCFS2_QUOTA_H */