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 /* Number of quota types we support */
  21 #define OCFS2_MAXQUOTAS 2
  22
  23 /*
  24  * In-memory structures
  25  */
  26 struct ocfs2_dquot {
  27         struct dquot dq_dquot;  /* Generic VFS dquot */
  28         loff_t dq_local_off;    /* Offset in the local quota file */
  29         u64 dq_local_phys_blk;  /* Physical block carrying quota structure */
  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         struct llist_node list; /* Member of list of dquots to drop */
  35 };
  36
  37 /* Description of one chunk to recover in memory */
  38 struct ocfs2_recovery_chunk {
  39         struct list_head rc_list;       /* List of chunks */
  40         int rc_chunk;                   /* Chunk number */
  41         unsigned long *rc_bitmap;       /* Bitmap of entries to recover */
  42 };
  43
  44 struct ocfs2_quota_recovery {
  45         struct list_head r_list[OCFS2_MAXQUOTAS];       /* List of chunks to recover */
  46 };
  47
  48 /* In-memory structure with quota header information */
  49 struct ocfs2_mem_dqinfo {
  50         unsigned int dqi_type;          /* Quota type this structure describes */
  51         unsigned int dqi_chunks;        /* Number of chunks in local quota file */
  52         unsigned int dqi_blocks;        /* Number of blocks allocated for local quota file */
  53         unsigned int dqi_syncms;        /* How often should we sync with other nodes */
  54         struct list_head dqi_chunk;     /* List of chunks */
  55         struct inode *dqi_gqinode;      /* Global quota file inode */
  56         struct ocfs2_lock_res dqi_gqlock;       /* Lock protecting quota information structure */
  57         struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */
  58         int dqi_gqi_count;              /* Number of holders of dqi_gqi_bh */
  59         u64 dqi_giblk;                  /* Number of block with global information header */
  60         struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */
  61         struct buffer_head *dqi_libh;   /* Buffer with local information header */
  62         struct qtree_mem_dqinfo dqi_gi; /* Info about global file */
  63         struct delayed_work dqi_sync_work;      /* Work for syncing dquots */
  64         struct ocfs2_quota_recovery *dqi_rec;   /* Pointer to recovery
  65                                                  * information, in case we
  66                                                  * enable quotas on file
  67                                                  * needing it */
  68 };
  69
  70 static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
  71 {
  72         return container_of(dquot, struct ocfs2_dquot, dq_dquot);
  73 }
  74
  75 struct ocfs2_quota_chunk {
  76         struct list_head qc_chunk;      /* List of quotafile chunks */
  77         int qc_num;                     /* Number of quota chunk */
  78         struct buffer_head *qc_headerbh;        /* Buffer head with chunk header */
  79 };
  80
  81 extern struct kmem_cache *ocfs2_dquot_cachep;
  82 extern struct kmem_cache *ocfs2_qf_chunk_cachep;
  83
  84 extern struct qtree_fmt_operations ocfs2_global_ops;
  85
  86 struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
  87                                 struct ocfs2_super *osb, int slot_num);
  88 int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
  89                                 struct ocfs2_quota_recovery *rec,
  90                                 int slot_num);
  91 void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec);
  92 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
  93                          size_t len, loff_t off);
  94 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
  95                           const char *data, size_t len, loff_t off);
  96 int ocfs2_global_read_info(struct super_block *sb, int type);
  97 int ocfs2_global_write_info(struct super_block *sb, int type);
  98 int ocfs2_global_read_dquot(struct dquot *dquot);
  99 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing);
 100 static inline int ocfs2_sync_dquot(struct dquot *dquot)
 101 {
 102         return __ocfs2_sync_dquot(dquot, 0);
 103 }
 104 static inline int ocfs2_global_release_dquot(struct dquot *dquot)
 105 {
 106         return __ocfs2_sync_dquot(dquot, 1);
 107 }
 108
 109 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
 110 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
 111 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh);
 112 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
 113                                 struct buffer_head **bh);
 114 int ocfs2_create_local_dquot(struct dquot *dquot);
 115 int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot);
 116 int ocfs2_local_write_dquot(struct dquot *dquot);
 117 void ocfs2_drop_dquot_refs(struct work_struct *work);
 118
 119 extern const struct dquot_operations ocfs2_quota_operations;
 120 extern struct quota_format_type ocfs2_quota_format;
 121
 122 #endif /* _OCFS2_QUOTA_H */