LXR linux/fs/ocfs2/quota.h

   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 */
 118