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         struct ocfs2_quota_chunk *dq_chunk;     /* Chunk dquot is in */
  27         unsigned int dq_use_count;      /* Number of nodes having reference to this entry in global quota file */
  28         s64 dq_origspace;       /* Last globally synced space usage */
  29         s64 dq_originodes;      /* Last globally synced inode usage */
  30 };
  31
  32 /* Description of one chunk to recover in memory */
  33 struct ocfs2_recovery_chunk {
  34         struct list_head rc_list;       /* List of chunks */
  35         int rc_chunk;                   /* Chunk number */
  36         unsigned long *rc_bitmap;       /* Bitmap of entries to recover */
  37 };
  38
  39 struct ocfs2_quota_recovery {
  40         struct list_head r_list[MAXQUOTAS];     /* List of chunks to recover */
  41 };
  42
  43 /* In-memory structure with quota header information */
  44 struct ocfs2_mem_dqinfo {
  45         unsigned int dqi_type;          /* Quota type this structure describes */
  46         unsigned int dqi_chunks;        /* Number of chunks in local quota file */
  47         unsigned int dqi_blocks;        /* Number of blocks allocated for local quota file */
  48         unsigned int dqi_syncms;        /* How often should we sync with other nodes */
  49         struct list_head dqi_chunk;     /* List of chunks */
  50         struct inode *dqi_gqinode;      /* Global quota file inode */
  51         struct ocfs2_lock_res dqi_gqlock;       /* Lock protecting quota information structure */
  52         struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */
  53         int dqi_gqi_count;              /* Number of holders of dqi_gqi_bh */
  54         struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */
  55         struct buffer_head *dqi_ibh;    /* Buffer with information header */
  56         struct qtree_mem_dqinfo dqi_gi; /* Info about global file */
  57         struct delayed_work dqi_sync_work;      /* Work for syncing dquots */
  58         struct ocfs2_quota_recovery *dqi_rec;   /* Pointer to recovery
  59                                                  * information, in case we
  60                                                  * enable quotas on file
  61                                                  * needing it */
  62 };
  63
  64 static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
  65 {
  66         return container_of(dquot, struct ocfs2_dquot, dq_dquot);
  67 }
  68
  69 struct ocfs2_quota_chunk {
  70         struct list_head qc_chunk;      /* List of quotafile chunks */
  71         int qc_num;                     /* Number of quota chunk */
  72         struct buffer_head *qc_headerbh;        /* Buffer head with chunk header */
  73 };
  74
  75 extern struct kmem_cache *ocfs2_dquot_cachep;
  76 extern struct kmem_cache *ocfs2_qf_chunk_cachep;
  77
  78 extern struct qtree_fmt_operations ocfs2_global_ops;
  79
  80 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
  81                                 struct ocfs2_super *osb, int slot_num);
  82 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
  83                                 struct ocfs2_quota_recovery *rec,
  84                                 int slot_num);
  85 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec);
  86 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
  87                          size_t len, loff_t off);
  88 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
  89                           const char *data, size_t len, loff_t off);
  90 int ocfs2_global_read_info(struct super_block *sb, int type);
  91 int ocfs2_global_write_info(struct super_block *sb, int type);
  92 int ocfs2_global_read_dquot(struct dquot *dquot);
  93 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing);
  94 static inline int ocfs2_sync_dquot(struct dquot *dquot)
  95 {
  96         return __ocfs2_sync_dquot(dquot, 0);
  97 }
  98 static inline int ocfs2_global_release_dquot(struct dquot *dquot)
  99 {
 100         return __ocfs2_sync_dquot(dquot, 1);
 101 }
 102
 103 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
 104 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
 105 int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
 106                            struct buffer_head **bh);
 107
 108 extern const struct dquot_operations ocfs2_quota_operations;
 109 extern struct quota_format_type ocfs2_quota_format;
 110
 111 int ocfs2_quota_setup(void);
 112 void ocfs2_quota_shutdown(void);
 113
 114 #endif /* _OCFS2_QUOTA_H */