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/* Number of quota types we support */
21#define OCFS2_MAXQUOTAS 2
22
23/*
24 * In-memory structures
25 */
26struct ocfs2_dquot {
27	struct dquot dq_dquot;	/* Generic VFS dquot */
28	loff_t dq_local_off;	/* Offset in the local quota file */
29	u64 dq_local_phys_blk;	/* Physical block carrying quota structure */
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	struct llist_node list;	/* Member of list of dquots to drop */
35};
36
37/* Description of one chunk to recover in memory */
38struct ocfs2_recovery_chunk {
39	struct list_head rc_list;	/* List of chunks */
40	int rc_chunk;			/* Chunk number */
41	unsigned long *rc_bitmap;	/* Bitmap of entries to recover */
42};
43
44struct ocfs2_quota_recovery {
45	struct list_head r_list[OCFS2_MAXQUOTAS];	/* List of chunks to recover */
46};
47
48/* In-memory structure with quota header information */
49struct ocfs2_mem_dqinfo {
50	unsigned int dqi_type;		/* Quota type this structure describes */
51	unsigned int dqi_flags;		/* Flags OLQF_* */
52	unsigned int dqi_chunks;	/* Number of chunks in local quota file */
53	unsigned int dqi_blocks;	/* Number of blocks allocated for local quota file */
54	unsigned int dqi_syncms;	/* How often should we sync with other nodes */
55	struct list_head dqi_chunk;	/* List of chunks */
56	struct inode *dqi_gqinode;	/* Global quota file inode */
57	struct ocfs2_lock_res dqi_gqlock;	/* Lock protecting quota information structure */
58	struct buffer_head *dqi_gqi_bh;	/* Buffer head with global quota file inode - set only if inode lock is obtained */
59	int dqi_gqi_count;		/* Number of holders of dqi_gqi_bh */
60	u64 dqi_giblk;			/* Number of block with global information header */
61	struct buffer_head *dqi_lqi_bh;	/* Buffer head with local quota file inode */
62	struct buffer_head *dqi_libh;	/* Buffer with local information header */
63	struct qtree_mem_dqinfo dqi_gi;	/* Info about global file */
64	struct delayed_work dqi_sync_work;	/* Work for syncing dquots */
65	struct ocfs2_quota_recovery *dqi_rec;	/* Pointer to recovery
66						 * information, in case we
67						 * enable quotas on file
68						 * needing it */
69};
70
71static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
72{
73	return container_of(dquot, struct ocfs2_dquot, dq_dquot);
74}
75
76struct ocfs2_quota_chunk {
77	struct list_head qc_chunk;	/* List of quotafile chunks */
78	int qc_num;			/* Number of quota chunk */
79	struct buffer_head *qc_headerbh;	/* Buffer head with chunk header */
80};
81
82extern struct kmem_cache *ocfs2_dquot_cachep;
83extern struct kmem_cache *ocfs2_qf_chunk_cachep;
84
85extern struct qtree_fmt_operations ocfs2_global_ops;
86
87struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
88				struct ocfs2_super *osb, int slot_num);
89int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
90				struct ocfs2_quota_recovery *rec,
91				int slot_num);
92void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec);
93ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
94			 size_t len, loff_t off);
95ssize_t ocfs2_quota_write(struct super_block *sb, int type,
96			  const char *data, size_t len, loff_t off);
97int ocfs2_global_read_info(struct super_block *sb, int type);
98int ocfs2_global_write_info(struct super_block *sb, int type);
99int ocfs2_global_read_dquot(struct dquot *dquot);
100int __ocfs2_sync_dquot(struct dquot *dquot, int freeing);
101static inline int ocfs2_sync_dquot(struct dquot *dquot)
102{
103	return __ocfs2_sync_dquot(dquot, 0);
104}
105static inline int ocfs2_global_release_dquot(struct dquot *dquot)
106{
107	return __ocfs2_sync_dquot(dquot, 1);
108}
109
110int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
111void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
112int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh);
113int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
114				struct buffer_head **bh);
115int ocfs2_create_local_dquot(struct dquot *dquot);
116int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot);
117int ocfs2_local_write_dquot(struct dquot *dquot);
118void ocfs2_drop_dquot_refs(struct work_struct *work);
119
120extern const struct dquot_operations ocfs2_quota_operations;
121extern struct quota_format_type ocfs2_quota_format;
122
123#endif /* _OCFS2_QUOTA_H */
124