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