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 */