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    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
117#endif /* _OCFS2_QUOTA_H */
118

Archive Download this file



interactive