release/src-rt-6.x.4708/linux/linux-2.6.36/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  */
  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 };
  32
  33 /* Description of one chunk to recover in memory */
  34 struct 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
  40 struct 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 */
  45 struct 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
  66 static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
  67 {
  68         return container_of(dquot, struct ocfs2_dquot, dq_dquot);
  69 }
  70
  71 struct 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
  77 extern struct kmem_cache *ocfs2_dquot_cachep;
  78 extern struct kmem_cache *ocfs2_qf_chunk_cachep;
  79
  80 extern struct qtree_fmt_operations ocfs2_global_ops;
  81
  82 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
  83                                 struct ocfs2_super *osb, int slot_num);
  84 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
  85                                 struct ocfs2_quota_recovery *rec,
  86                                 int slot_num);
  87 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec);
  88 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
  89                          size_t len, loff_t off);
  90 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
  91                           const char *data, size_t len, loff_t off);
  92 int ocfs2_global_read_info(struct super_block *sb, int type);
  93 int ocfs2_global_write_info(struct super_block *sb, int type);
  94 int ocfs2_global_read_dquot(struct dquot *dquot);
  95 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing);
  96 static inline int ocfs2_sync_dquot(struct dquot *dquot)
  97 {
  98         return __ocfs2_sync_dquot(dquot, 0);
  99 }
 100 static inline int ocfs2_global_release_dquot(struct dquot *dquot)
 101 {
 102         return __ocfs2_sync_dquot(dquot, 1);
 103 }
 104
 105 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
 106 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
 107 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh);
 108 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
 109                                 struct buffer_head **bh);
 110 int ocfs2_create_local_dquot(struct dquot *dquot);
 111 int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot);
 112 int ocfs2_local_write_dquot(struct dquot *dquot);
 113
 114 extern const struct dquot_operations ocfs2_quota_operations;
 115 extern struct quota_format_type ocfs2_quota_format;
 116
 117 int ocfs2_quota_setup(void);
 118 void ocfs2_quota_shutdown(void);
 119
 120 #endif /* _OCFS2_QUOTA_H */