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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 | /* Common stuff */ |
21 | /* id number of quota format */ |
22 | #define QFMT_OCFS2 3 |
23 | |
24 | /* |
25 | * In-memory structures |
26 | */ |
27 | struct 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 | /* Description of one chunk to recover in memory */ |
37 | struct ocfs2_recovery_chunk { |
38 | struct list_head rc_list; /* List of chunks */ |
39 | int rc_chunk; /* Chunk number */ |
40 | unsigned long *rc_bitmap; /* Bitmap of entries to recover */ |
41 | }; |
42 | |
43 | struct ocfs2_quota_recovery { |
44 | struct list_head r_list[MAXQUOTAS]; /* List of chunks to recover */ |
45 | }; |
46 | |
47 | /* In-memory structure with quota header information */ |
48 | struct ocfs2_mem_dqinfo { |
49 | unsigned int dqi_type; /* Quota type this structure describes */ |
50 | unsigned int dqi_chunks; /* Number of chunks in local quota file */ |
51 | unsigned int dqi_blocks; /* Number of blocks allocated for local quota file */ |
52 | unsigned int dqi_syncms; /* How often should we sync with other nodes */ |
53 | struct list_head dqi_chunk; /* List of chunks */ |
54 | struct inode *dqi_gqinode; /* Global quota file inode */ |
55 | struct ocfs2_lock_res dqi_gqlock; /* Lock protecting quota information structure */ |
56 | struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */ |
57 | int dqi_gqi_count; /* Number of holders of dqi_gqi_bh */ |
58 | struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */ |
59 | struct buffer_head *dqi_ibh; /* Buffer with information header */ |
60 | struct qtree_mem_dqinfo dqi_gi; /* Info about global file */ |
61 | struct delayed_work dqi_sync_work; /* Work for syncing dquots */ |
62 | struct ocfs2_quota_recovery *dqi_rec; /* Pointer to recovery |
63 | * information, in case we |
64 | * enable quotas on file |
65 | * needing it */ |
66 | }; |
67 | |
68 | static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot) |
69 | { |
70 | return container_of(dquot, struct ocfs2_dquot, dq_dquot); |
71 | } |
72 | |
73 | struct ocfs2_quota_chunk { |
74 | struct list_head qc_chunk; /* List of quotafile chunks */ |
75 | int qc_num; /* Number of quota chunk */ |
76 | struct buffer_head *qc_headerbh; /* Buffer head with chunk header */ |
77 | }; |
78 | |
79 | extern struct kmem_cache *ocfs2_dquot_cachep; |
80 | extern struct kmem_cache *ocfs2_qf_chunk_cachep; |
81 | |
82 | extern struct qtree_fmt_operations ocfs2_global_ops; |
83 | |
84 | struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery( |
85 | struct ocfs2_super *osb, int slot_num); |
86 | int ocfs2_finish_quota_recovery(struct ocfs2_super *osb, |
87 | struct ocfs2_quota_recovery *rec, |
88 | int slot_num); |
89 | void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec); |
90 | ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, |
91 | size_t len, loff_t off); |
92 | ssize_t ocfs2_quota_write(struct super_block *sb, int type, |
93 | const char *data, size_t len, loff_t off); |
94 | int ocfs2_global_read_info(struct super_block *sb, int type); |
95 | int ocfs2_global_write_info(struct super_block *sb, int type); |
96 | int ocfs2_global_read_dquot(struct dquot *dquot); |
97 | int __ocfs2_sync_dquot(struct dquot *dquot, int freeing); |
98 | static inline int ocfs2_sync_dquot(struct dquot *dquot) |
99 | { |
100 | return __ocfs2_sync_dquot(dquot, 0); |
101 | } |
102 | static inline int ocfs2_global_release_dquot(struct dquot *dquot) |
103 | { |
104 | return __ocfs2_sync_dquot(dquot, 1); |
105 | } |
106 | |
107 | int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); |
108 | void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); |
109 | int ocfs2_read_quota_block(struct inode *inode, u64 v_block, |
110 | struct buffer_head **bh); |
111 | |
112 | extern struct dquot_operations ocfs2_quota_operations; |
113 | extern struct quota_format_type ocfs2_quota_format; |
114 | |
115 | int ocfs2_quota_setup(void); |
116 | void ocfs2_quota_shutdown(void); |
117 | |
118 | #endif /* _OCFS2_QUOTA_H */ |
119 |
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