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	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 */
34struct 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
40struct 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 */
45struct 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
66static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
67{
68	return container_of(dquot, struct ocfs2_dquot, dq_dquot);
69}
70
71struct 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
77extern struct kmem_cache *ocfs2_dquot_cachep;
78extern struct kmem_cache *ocfs2_qf_chunk_cachep;
79
80extern struct qtree_fmt_operations ocfs2_global_ops;
81
82struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
83				struct ocfs2_super *osb, int slot_num);
84int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
85				struct ocfs2_quota_recovery *rec,
86				int slot_num);
87void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec);
88ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
89			 size_t len, loff_t off);
90ssize_t ocfs2_quota_write(struct super_block *sb, int type,
91			  const char *data, size_t len, loff_t off);
92int ocfs2_global_read_info(struct super_block *sb, int type);
93int ocfs2_global_write_info(struct super_block *sb, int type);
94int ocfs2_global_read_dquot(struct dquot *dquot);
95int __ocfs2_sync_dquot(struct dquot *dquot, int freeing);
96static inline int ocfs2_sync_dquot(struct dquot *dquot)
97{
98	return __ocfs2_sync_dquot(dquot, 0);
99}
100static inline int ocfs2_global_release_dquot(struct dquot *dquot)
101{
102	return __ocfs2_sync_dquot(dquot, 1);
103}
104
105int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
106void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
107int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh);
108int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
109				struct buffer_head **bh);
110int ocfs2_create_local_dquot(struct dquot *dquot);
111int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot);
112int ocfs2_local_write_dquot(struct dquot *dquot);
113
114extern const struct dquot_operations ocfs2_quota_operations;
115extern struct quota_format_type ocfs2_quota_format;
116
117int ocfs2_quota_setup(void);
118void ocfs2_quota_shutdown(void);
119
120#endif /* _OCFS2_QUOTA_H */
121