[linux-block.git] / fs / ocfs2 / quota.h

/*
 * quota.h for OCFS2
 *
 * On disk quota structures for local and global quota file, in-memory
 * structures.
 *
 */

#ifndef _OCFS2_QUOTA_H
#define _OCFS2_QUOTA_H

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/quota.h>
#include <linux/list.h>
#include <linux/dqblk_qtree.h>

#include "ocfs2.h"

/* Common stuff */
/* id number of quota format */
#define QFMT_OCFS2 3

/*
 * In-memory structures
 */
struct ocfs2_dquot {
	struct dquot dq_dquot;	/* Generic VFS dquot */
	loff_t dq_local_off;	/* Offset in the local quota file */
	struct ocfs2_quota_chunk *dq_chunk;	/* Chunk dquot is in */
	unsigned int dq_use_count;	/* Number of nodes having reference to this entry in global quota file */
	s64 dq_origspace;	/* Last globally synced space usage */
	s64 dq_originodes;	/* Last globally synced inode usage */
};

/* Description of one chunk to recover in memory */
struct ocfs2_recovery_chunk {
	struct list_head rc_list;	/* List of chunks */
	int rc_chunk;			/* Chunk number */
	unsigned long *rc_bitmap;	/* Bitmap of entries to recover */
};

struct ocfs2_quota_recovery {
	struct list_head r_list[MAXQUOTAS];	/* List of chunks to recover */
};

/* In-memory structure with quota header information */
struct ocfs2_mem_dqinfo {
	unsigned int dqi_type;		/* Quota type this structure describes */
	unsigned int dqi_chunks;	/* Number of chunks in local quota file */
	unsigned int dqi_blocks;	/* Number of blocks allocated for local quota file */
	unsigned int dqi_syncms;	/* How often should we sync with other nodes */
	struct list_head dqi_chunk;	/* List of chunks */
	struct inode *dqi_gqinode;	/* Global quota file inode */
	struct ocfs2_lock_res dqi_gqlock;	/* Lock protecting quota information structure */
	struct buffer_head *dqi_gqi_bh;	/* Buffer head with global quota file inode - set only if inode lock is obtained */
	int dqi_gqi_count;		/* Number of holders of dqi_gqi_bh */
	struct buffer_head *dqi_lqi_bh;	/* Buffer head with local quota file inode */
	struct buffer_head *dqi_ibh;	/* Buffer with information header */
	struct qtree_mem_dqinfo dqi_gi;	/* Info about global file */
	struct delayed_work dqi_sync_work;	/* Work for syncing dquots */
	struct ocfs2_quota_recovery *dqi_rec;	/* Pointer to recovery
						 * information, in case we
						 * enable quotas on file
						 * needing it */
};

static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
{
	return container_of(dquot, struct ocfs2_dquot, dq_dquot);
}

struct ocfs2_quota_chunk {
	struct list_head qc_chunk;	/* List of quotafile chunks */
	int qc_num;			/* Number of quota chunk */
	struct buffer_head *qc_headerbh;	/* Buffer head with chunk header */
};

extern struct kmem_cache *ocfs2_dquot_cachep;
extern struct kmem_cache *ocfs2_qf_chunk_cachep;

extern struct qtree_fmt_operations ocfs2_global_ops;

struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
				struct ocfs2_super *osb, int slot_num);
int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
				struct ocfs2_quota_recovery *rec,
				int slot_num);
void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec);
ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
			 size_t len, loff_t off);
ssize_t ocfs2_quota_write(struct super_block *sb, int type,
			  const char *data, size_t len, loff_t off);
int ocfs2_global_read_info(struct super_block *sb, int type);
int ocfs2_global_write_info(struct super_block *sb, int type);
int ocfs2_global_read_dquot(struct dquot *dquot);
int __ocfs2_sync_dquot(struct dquot *dquot, int freeing);
static inline int ocfs2_sync_dquot(struct dquot *dquot)
{
	return __ocfs2_sync_dquot(dquot, 0);
}
static inline int ocfs2_global_release_dquot(struct dquot *dquot)
{
	return __ocfs2_sync_dquot(dquot, 1);
}

int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
			   struct buffer_head **bh);

extern struct dquot_operations ocfs2_quota_operations;
extern struct quota_format_type ocfs2_quota_format;

int ocfs2_quota_setup(void);
void ocfs2_quota_shutdown(void);

#endif /* _OCFS2_QUOTA_H */
Commit	Line	Data
9e33d69f JK	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
2205363d JK	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
9e33d69f JK	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 */
171bf93c	61	struct delayed_work dqi_sync_work; /* Work for syncing dquots */
2205363d JK	62	struct ocfs2_quota_recovery dqi_rec; / Pointer to recovery
	63	* information, in case we
	64	* enable quotas on file
	65	* needing it */
9e33d69f JK	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
2205363d JK	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);
9e33d69f JK	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);
85eb8b73 JB	109	int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
85eb8b73 JB	110	struct buffer_head **bh);
9e33d69f JK	111
	112	extern struct dquot_operations ocfs2_quota_operations;
	113	extern struct quota_format_type ocfs2_quota_format;
	114
171bf93c MF	115	int ocfs2_quota_setup(void);
	116	void ocfs2_quota_shutdown(void);
	117
9e33d69f	118	#endif /* _OCFS2_QUOTA_H */