xref: /openbmc/linux/fs/ocfs2/quota.h (revision 3932b9ca)
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 	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 	struct llist_node list;	/* Member of list of dquots to drop */
32 };
33 
34 /* Description of one chunk to recover in memory */
35 struct ocfs2_recovery_chunk {
36 	struct list_head rc_list;	/* List of chunks */
37 	int rc_chunk;			/* Chunk number */
38 	unsigned long *rc_bitmap;	/* Bitmap of entries to recover */
39 };
40 
41 struct ocfs2_quota_recovery {
42 	struct list_head r_list[MAXQUOTAS];	/* List of chunks to recover */
43 };
44 
45 /* In-memory structure with quota header information */
46 struct ocfs2_mem_dqinfo {
47 	unsigned int dqi_type;		/* Quota type this structure describes */
48 	unsigned int dqi_chunks;	/* Number of chunks in local quota file */
49 	unsigned int dqi_blocks;	/* Number of blocks allocated for local quota file */
50 	unsigned int dqi_syncms;	/* How often should we sync with other nodes */
51 	struct list_head dqi_chunk;	/* List of chunks */
52 	struct inode *dqi_gqinode;	/* Global quota file inode */
53 	struct ocfs2_lock_res dqi_gqlock;	/* Lock protecting quota information structure */
54 	struct buffer_head *dqi_gqi_bh;	/* Buffer head with global quota file inode - set only if inode lock is obtained */
55 	int dqi_gqi_count;		/* Number of holders of dqi_gqi_bh */
56 	u64 dqi_giblk;			/* Number of block with global information header */
57 	struct buffer_head *dqi_lqi_bh;	/* Buffer head with local quota file inode */
58 	struct buffer_head *dqi_libh;	/* Buffer with local information header */
59 	struct qtree_mem_dqinfo dqi_gi;	/* Info about global file */
60 	struct delayed_work dqi_sync_work;	/* Work for syncing dquots */
61 	struct ocfs2_quota_recovery *dqi_rec;	/* Pointer to recovery
62 						 * information, in case we
63 						 * enable quotas on file
64 						 * needing it */
65 };
66 
67 static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
68 {
69 	return container_of(dquot, struct ocfs2_dquot, dq_dquot);
70 }
71 
72 struct ocfs2_quota_chunk {
73 	struct list_head qc_chunk;	/* List of quotafile chunks */
74 	int qc_num;			/* Number of quota chunk */
75 	struct buffer_head *qc_headerbh;	/* Buffer head with chunk header */
76 };
77 
78 extern struct kmem_cache *ocfs2_dquot_cachep;
79 extern struct kmem_cache *ocfs2_qf_chunk_cachep;
80 
81 extern struct qtree_fmt_operations ocfs2_global_ops;
82 
83 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
84 				struct ocfs2_super *osb, int slot_num);
85 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
86 				struct ocfs2_quota_recovery *rec,
87 				int slot_num);
88 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec);
89 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
90 			 size_t len, loff_t off);
91 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
92 			  const char *data, size_t len, loff_t off);
93 int ocfs2_global_read_info(struct super_block *sb, int type);
94 int ocfs2_global_write_info(struct super_block *sb, int type);
95 int ocfs2_global_read_dquot(struct dquot *dquot);
96 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing);
97 static inline int ocfs2_sync_dquot(struct dquot *dquot)
98 {
99 	return __ocfs2_sync_dquot(dquot, 0);
100 }
101 static inline int ocfs2_global_release_dquot(struct dquot *dquot)
102 {
103 	return __ocfs2_sync_dquot(dquot, 1);
104 }
105 
106 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
107 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
108 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh);
109 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
110 				struct buffer_head **bh);
111 int ocfs2_create_local_dquot(struct dquot *dquot);
112 int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot);
113 int ocfs2_local_write_dquot(struct dquot *dquot);
114 void ocfs2_drop_dquot_refs(struct work_struct *work);
115 
116 extern const struct dquot_operations ocfs2_quota_operations;
117 extern struct quota_format_type ocfs2_quota_format;
118 
119 #endif /* _OCFS2_QUOTA_H */
120