xref: /openbmc/linux/fs/ocfs2/quota.h (revision 9d56dd3b083a3bec56e9da35ce07baca81030b03)
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  */
23 struct ocfs2_dquot {
24 	struct dquot dq_dquot;	/* Generic VFS dquot */
25 	loff_t dq_local_off;	/* Offset in the local quota file */
26 	struct ocfs2_quota_chunk *dq_chunk;	/* Chunk dquot is in */
27 	unsigned int dq_use_count;	/* Number of nodes having reference to this entry in global quota file */
28 	s64 dq_origspace;	/* Last globally synced space usage */
29 	s64 dq_originodes;	/* Last globally synced inode usage */
30 };
31 
32 /* Description of one chunk to recover in memory */
33 struct ocfs2_recovery_chunk {
34 	struct list_head rc_list;	/* List of chunks */
35 	int rc_chunk;			/* Chunk number */
36 	unsigned long *rc_bitmap;	/* Bitmap of entries to recover */
37 };
38 
39 struct ocfs2_quota_recovery {
40 	struct list_head r_list[MAXQUOTAS];	/* List of chunks to recover */
41 };
42 
43 /* In-memory structure with quota header information */
44 struct ocfs2_mem_dqinfo {
45 	unsigned int dqi_type;		/* Quota type this structure describes */
46 	unsigned int dqi_chunks;	/* Number of chunks in local quota file */
47 	unsigned int dqi_blocks;	/* Number of blocks allocated for local quota file */
48 	unsigned int dqi_syncms;	/* How often should we sync with other nodes */
49 	struct list_head dqi_chunk;	/* List of chunks */
50 	struct inode *dqi_gqinode;	/* Global quota file inode */
51 	struct ocfs2_lock_res dqi_gqlock;	/* Lock protecting quota information structure */
52 	struct buffer_head *dqi_gqi_bh;	/* Buffer head with global quota file inode - set only if inode lock is obtained */
53 	int dqi_gqi_count;		/* Number of holders of dqi_gqi_bh */
54 	struct buffer_head *dqi_lqi_bh;	/* Buffer head with local quota file inode */
55 	struct buffer_head *dqi_ibh;	/* Buffer with information header */
56 	struct qtree_mem_dqinfo dqi_gi;	/* Info about global file */
57 	struct delayed_work dqi_sync_work;	/* Work for syncing dquots */
58 	struct ocfs2_quota_recovery *dqi_rec;	/* Pointer to recovery
59 						 * information, in case we
60 						 * enable quotas on file
61 						 * needing it */
62 };
63 
64 static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
65 {
66 	return container_of(dquot, struct ocfs2_dquot, dq_dquot);
67 }
68 
69 struct ocfs2_quota_chunk {
70 	struct list_head qc_chunk;	/* List of quotafile chunks */
71 	int qc_num;			/* Number of quota chunk */
72 	struct buffer_head *qc_headerbh;	/* Buffer head with chunk header */
73 };
74 
75 extern struct kmem_cache *ocfs2_dquot_cachep;
76 extern struct kmem_cache *ocfs2_qf_chunk_cachep;
77 
78 extern struct qtree_fmt_operations ocfs2_global_ops;
79 
80 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
81 				struct ocfs2_super *osb, int slot_num);
82 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
83 				struct ocfs2_quota_recovery *rec,
84 				int slot_num);
85 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec);
86 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
87 			 size_t len, loff_t off);
88 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
89 			  const char *data, size_t len, loff_t off);
90 int ocfs2_global_read_info(struct super_block *sb, int type);
91 int ocfs2_global_write_info(struct super_block *sb, int type);
92 int ocfs2_global_read_dquot(struct dquot *dquot);
93 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing);
94 static inline int ocfs2_sync_dquot(struct dquot *dquot)
95 {
96 	return __ocfs2_sync_dquot(dquot, 0);
97 }
98 static inline int ocfs2_global_release_dquot(struct dquot *dquot)
99 {
100 	return __ocfs2_sync_dquot(dquot, 1);
101 }
102 
103 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
104 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
105 int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
106 			   struct buffer_head **bh);
107 
108 extern const struct dquot_operations ocfs2_quota_operations;
109 extern struct quota_format_type ocfs2_quota_format;
110 
111 int ocfs2_quota_setup(void);
112 void ocfs2_quota_shutdown(void);
113 
114 #endif /* _OCFS2_QUOTA_H */
115