fs/xfs/xfs_buf_item.h

   1 /*
   2  * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_BUF_ITEM_H__
  19 #define __XFS_BUF_ITEM_H__
  20
  21 extern kmem_zone_t      *xfs_buf_item_zone;
  22
  23 /*
  24  * This flag indicates that the buffer contains on disk inodes
  25  * and requires special recovery handling.
  26  */
  27 #define XFS_BLF_INODE_BUF       (1<<0)
  28 /*
  29  * This flag indicates that the buffer should not be replayed
  30  * during recovery because its blocks are being freed.
  31  */
  32 #define XFS_BLF_CANCEL          (1<<1)
  33
  34 /*
  35  * This flag indicates that the buffer contains on disk
  36  * user or group dquots and may require special recovery handling.
  37  */
  38 #define XFS_BLF_UDQUOT_BUF      (1<<2)
  39 #define XFS_BLF_PDQUOT_BUF      (1<<3)
  40 #define XFS_BLF_GDQUOT_BUF      (1<<4)
  41
  42 /*
  43  * all buffers now need flags to tell recovery where the magic number
  44  * is so that it can verify and calculate the CRCs on the buffer correctly
  45  * once the changes have been replayed into the buffer.
  46  */
  47 #define XFS_BLF_BTREE_BUF       (1<<5)
  48 #define XFS_BLF_AGF_BUF         (1<<6)
  49
  50 #define XFS_BLF_TYPE_MASK       \
  51                 (XFS_BLF_UDQUOT_BUF | \
  52                  XFS_BLF_PDQUOT_BUF | \
  53                  XFS_BLF_GDQUOT_BUF | \
  54                  XFS_BLF_BTREE_BUF | \
  55                  XFS_BLF_AGF_BUF)
  56
  57 #define XFS_BLF_CHUNK           128
  58 #define XFS_BLF_SHIFT           7
  59 #define BIT_TO_WORD_SHIFT       5
  60 #define NBWORD                  (NBBY * sizeof(unsigned int))
  61
  62 /*
  63  * This is the structure used to lay out a buf log item in the
  64  * log.  The data map describes which 128 byte chunks of the buffer
  65  * have been logged.
  66  */
  67 #define XFS_BLF_DATAMAP_SIZE    ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD)
  68
  69 typedef struct xfs_buf_log_format {
  70         unsigned short  blf_type;       /* buf log item type indicator */
  71         unsigned short  blf_size;       /* size of this item */
  72         ushort          blf_flags;      /* misc state */
  73         ushort          blf_len;        /* number of blocks in this buf */
  74         __int64_t       blf_blkno;      /* starting blkno of this buf */
  75         unsigned int    blf_map_size;   /* used size of data bitmap in words */
  76         unsigned int    blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */
  77 } xfs_buf_log_format_t;
  78
  79 /*
  80  * buf log item flags
  81  */
  82 #define XFS_BLI_HOLD            0x01
  83 #define XFS_BLI_DIRTY           0x02
  84 #define XFS_BLI_STALE           0x04
  85 #define XFS_BLI_LOGGED          0x08
  86 #define XFS_BLI_INODE_ALLOC_BUF 0x10
  87 #define XFS_BLI_STALE_INODE     0x20
  88 #define XFS_BLI_INODE_BUF       0x40
  89
  90 #define XFS_BLI_FLAGS \
  91         { XFS_BLI_HOLD,         "HOLD" }, \
  92         { XFS_BLI_DIRTY,        "DIRTY" }, \
  93         { XFS_BLI_STALE,        "STALE" }, \
  94         { XFS_BLI_LOGGED,       "LOGGED" }, \
  95         { XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \
  96         { XFS_BLI_STALE_INODE,  "STALE_INODE" }, \
  97         { XFS_BLI_INODE_BUF,    "INODE_BUF" }
  98
  99
 100 #ifdef __KERNEL__
 101
 102 struct xfs_buf;
 103 struct xfs_mount;
 104 struct xfs_buf_log_item;
 105
 106 /*
 107  * This is the in core log item structure used to track information
 108  * needed to log buffers.  It tracks how many times the lock has been
 109  * locked, and which 128 byte chunks of the buffer are dirty.
 110  */
 111 typedef struct xfs_buf_log_item {
 112         xfs_log_item_t          bli_item;       /* common item structure */
 113         struct xfs_buf          *bli_buf;       /* real buffer pointer */
 114         unsigned int            bli_flags;      /* misc flags */
 115         unsigned int            bli_recur;      /* lock recursion count */
 116         atomic_t                bli_refcount;   /* cnt of tp refs */
 117         int                     bli_format_count;       /* count of headers */
 118         struct xfs_buf_log_format *bli_formats; /* array of in-log header ptrs */
 119         struct xfs_buf_log_format __bli_format; /* embedded in-log header */
 120 } xfs_buf_log_item_t;
 121
 122 void    xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
 123 void    xfs_buf_item_relse(struct xfs_buf *);
 124 void    xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
 125 uint    xfs_buf_item_dirty(xfs_buf_log_item_t *);
 126 void    xfs_buf_attach_iodone(struct xfs_buf *,
 127                               void(*)(struct xfs_buf *, xfs_log_item_t *),
 128                               xfs_log_item_t *);
 129 void    xfs_buf_iodone_callbacks(struct xfs_buf *);
 130 void    xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *);
 131
 132 #endif  /* __KERNEL__ */
 133
 134 #endif  /* __XFS_BUF_ITEM_H__ */