release/src-rt-6.x.4708/linux/linux-2.6.36/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 is the structure used to lay out a buf log item in the
  25  * log.  The data map describes which 128 byte chunks of the buffer
  26  * have been logged.
  27  * For 6.2 and beyond, this is XFS_LI_BUF.  We use this to log everything.
  28  */
  29 typedef struct xfs_buf_log_format {
  30         unsigned short  blf_type;       /* buf log item type indicator */
  31         unsigned short  blf_size;       /* size of this item */
  32         ushort          blf_flags;      /* misc state */
  33         ushort          blf_len;        /* number of blocks in this buf */
  34         __int64_t       blf_blkno;      /* starting blkno of this buf */
  35         unsigned int    blf_map_size;   /* size of data bitmap in words */
  36         unsigned int    blf_data_map[1];/* variable size bitmap of */
  37                                         /*   regions of buffer in this item */
  38 } xfs_buf_log_format_t;
  39
  40 /*
  41  * This flag indicates that the buffer contains on disk inodes
  42  * and requires special recovery handling.
  43  */
  44 #define XFS_BLF_INODE_BUF       0x1
  45 /*
  46  * This flag indicates that the buffer should not be replayed
  47  * during recovery because its blocks are being freed.
  48  */
  49 #define XFS_BLF_CANCEL          0x2
  50 /*
  51  * This flag indicates that the buffer contains on disk
  52  * user or group dquots and may require special recovery handling.
  53  */
  54 #define XFS_BLF_UDQUOT_BUF      0x4
  55 #define XFS_BLF_PDQUOT_BUF      0x8
  56 #define XFS_BLF_GDQUOT_BUF      0x10
  57
  58 #define XFS_BLF_CHUNK           128
  59 #define XFS_BLF_SHIFT           7
  60 #define BIT_TO_WORD_SHIFT       5
  61 #define NBWORD                  (NBBY * sizeof(unsigned int))
  62
  63 /*
  64  * buf log item flags
  65  */
  66 #define XFS_BLI_HOLD            0x01
  67 #define XFS_BLI_DIRTY           0x02
  68 #define XFS_BLI_STALE           0x04
  69 #define XFS_BLI_LOGGED          0x08
  70 #define XFS_BLI_INODE_ALLOC_BUF 0x10
  71 #define XFS_BLI_STALE_INODE     0x20
  72 #define XFS_BLI_INODE_BUF       0x40
  73
  74 #define XFS_BLI_FLAGS \
  75         { XFS_BLI_HOLD,         "HOLD" }, \
  76         { XFS_BLI_DIRTY,        "DIRTY" }, \
  77         { XFS_BLI_STALE,        "STALE" }, \
  78         { XFS_BLI_LOGGED,       "LOGGED" }, \
  79         { XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \
  80         { XFS_BLI_STALE_INODE,  "STALE_INODE" }, \
  81         { XFS_BLI_INODE_BUF,    "INODE_BUF" }
  82
  83
  84 #ifdef __KERNEL__
  85
  86 struct xfs_buf;
  87 struct xfs_mount;
  88 struct xfs_buf_log_item;
  89
  90 /*
  91  * This is the in core log item structure used to track information
  92  * needed to log buffers.  It tracks how many times the lock has been
  93  * locked, and which 128 byte chunks of the buffer are dirty.
  94  */
  95 typedef struct xfs_buf_log_item {
  96         xfs_log_item_t          bli_item;       /* common item structure */
  97         struct xfs_buf          *bli_buf;       /* real buffer pointer */
  98         unsigned int            bli_flags;      /* misc flags */
  99         unsigned int            bli_recur;      /* lock recursion count */
 100         atomic_t                bli_refcount;   /* cnt of tp refs */
 101 #ifdef XFS_TRANS_DEBUG
 102         char                    *bli_orig;      /* original buffer copy */
 103         char                    *bli_logged;    /* bytes logged (bitmap) */
 104 #endif
 105         xfs_buf_log_format_t    bli_format;     /* in-log header */
 106 } xfs_buf_log_item_t;
 107
 108 /*
 109  * This structure is used during recovery to record the buf log
 110  * items which have been canceled and should not be replayed.
 111  */
 112 typedef struct xfs_buf_cancel {
 113         xfs_daddr_t             bc_blkno;
 114         uint                    bc_len;
 115         int                     bc_refcount;
 116         struct xfs_buf_cancel   *bc_next;
 117 } xfs_buf_cancel_t;
 118
 119 void    xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
 120 void    xfs_buf_item_relse(struct xfs_buf *);
 121 void    xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
 122 uint    xfs_buf_item_dirty(xfs_buf_log_item_t *);
 123 void    xfs_buf_attach_iodone(struct xfs_buf *,
 124                               void(*)(struct xfs_buf *, xfs_log_item_t *),
 125                               xfs_log_item_t *);
 126 void    xfs_buf_iodone_callbacks(struct xfs_buf *);
 127 void    xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *);
 128
 129 #ifdef XFS_TRANS_DEBUG
 130 void
 131 xfs_buf_item_flush_log_debug(
 132         struct xfs_buf *bp,
 133         uint    first,
 134         uint    last);
 135 #else
 136 #define xfs_buf_item_flush_log_debug(bp, first, last)
 137 #endif
 138
 139 #endif  /* __KERNEL__ */
 140
 141 #endif  /* __XFS_BUF_ITEM_H__ */