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 /*
  22  * This is the structure used to lay out a buf log item in the
  23  * log.  The data map describes which 128 byte chunks of the buffer
  24  * have been logged.  This structure works only on buffers that
  25  * reside up to the first TB in the filesystem.  These buffers are
  26  * generated only by pre-6.2 systems and are known as XFS_LI_6_1_BUF.
  27  */
  28 typedef struct xfs_buf_log_format_v1 {
  29         unsigned short  blf_type;       /* buf log item type indicator */
  30         unsigned short  blf_size;       /* size of this item */
  31         __int32_t       blf_blkno;      /* starting blkno of this buf */
  32         ushort          blf_flags;      /* misc state */
  33         ushort          blf_len;        /* number of blocks in this buf */
  34         unsigned int    blf_map_size;   /* size of data bitmap in words */
  35         unsigned int    blf_data_map[1];/* variable size bitmap of */
  36                                         /*   regions of buffer in this item */
  37 } xfs_buf_log_format_v1_t;
  38
  39 /*
  40  * This is a form of the above structure with a 64 bit blkno field.
  41  * For 6.2 and beyond, this is XFS_LI_BUF.  We use this to log everything.
  42  */
  43 typedef struct xfs_buf_log_format_t {
  44         unsigned short  blf_type;       /* buf log item type indicator */
  45         unsigned short  blf_size;       /* size of this item */
  46         ushort          blf_flags;      /* misc state */
  47         ushort          blf_len;        /* number of blocks in this buf */
  48         __int64_t       blf_blkno;      /* starting blkno of this buf */
  49         unsigned int    blf_map_size;   /* size of data bitmap in words */
  50         unsigned int    blf_data_map[1];/* variable size bitmap of */
  51                                         /*   regions of buffer in this item */
  52 } xfs_buf_log_format_t;
  53
  54 /*
  55  * This flag indicates that the buffer contains on disk inodes
  56  * and requires special recovery handling.
  57  */
  58 #define XFS_BLI_INODE_BUF       0x1
  59 /*
  60  * This flag indicates that the buffer should not be replayed
  61  * during recovery because its blocks are being freed.
  62  */
  63 #define XFS_BLI_CANCEL          0x2
  64 /*
  65  * This flag indicates that the buffer contains on disk
  66  * user or group dquots and may require special recovery handling.
  67  */
  68 #define XFS_BLI_UDQUOT_BUF      0x4
  69 #define XFS_BLI_PDQUOT_BUF      0x8
  70 #define XFS_BLI_GDQUOT_BUF      0x10
  71
  72 #define XFS_BLI_CHUNK           128
  73 #define XFS_BLI_SHIFT           7
  74 #define BIT_TO_WORD_SHIFT       5
  75 #define NBWORD                  (NBBY * sizeof(unsigned int))
  76
  77 /*
  78  * buf log item flags
  79  */
  80 #define XFS_BLI_HOLD            0x01
  81 #define XFS_BLI_DIRTY           0x02
  82 #define XFS_BLI_STALE           0x04
  83 #define XFS_BLI_LOGGED          0x08
  84 #define XFS_BLI_INODE_ALLOC_BUF 0x10
  85 #define XFS_BLI_STALE_INODE     0x20
  86
  87
  88 #ifdef __KERNEL__
  89
  90 struct xfs_buf;
  91 struct ktrace;
  92 struct xfs_mount;
  93 struct xfs_buf_log_item;
  94
  95 #if defined(XFS_BLI_TRACE)
  96 #define XFS_BLI_TRACE_SIZE      32
  97
  98 void    xfs_buf_item_trace(char *, struct xfs_buf_log_item *);
  99 #else
 100 #define xfs_buf_item_trace(id, bip)
 101 #endif
 102
 103 /*
 104  * This is the in core log item structure used to track information
 105  * needed to log buffers.  It tracks how many times the lock has been
 106  * locked, and which 128 byte chunks of the buffer are dirty.
 107  */
 108 typedef struct xfs_buf_log_item {
 109         xfs_log_item_t          bli_item;       /* common item structure */
 110         struct xfs_buf          *bli_buf;       /* real buffer pointer */
 111         unsigned int            bli_flags;      /* misc flags */
 112         unsigned int            bli_recur;      /* lock recursion count */
 113         atomic_t                bli_refcount;   /* cnt of tp refs */
 114 #ifdef XFS_BLI_TRACE
 115         struct ktrace           *bli_trace;     /* event trace buf */
 116 #endif
 117 #ifdef XFS_TRANS_DEBUG
 118         char                    *bli_orig;      /* original buffer copy */
 119         char                    *bli_logged;    /* bytes logged (bitmap) */
 120 #endif
 121         xfs_buf_log_format_t    bli_format;     /* in-log header */
 122 } xfs_buf_log_item_t;
 123
 124 /*
 125  * This structure is used during recovery to record the buf log
 126  * items which have been canceled and should not be replayed.
 127  */
 128 typedef struct xfs_buf_cancel {
 129         xfs_daddr_t             bc_blkno;
 130         uint                    bc_len;
 131         int                     bc_refcount;
 132         struct xfs_buf_cancel   *bc_next;
 133 } xfs_buf_cancel_t;
 134
 135 void    xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
 136 void    xfs_buf_item_relse(struct xfs_buf *);
 137 void    xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
 138 uint    xfs_buf_item_dirty(xfs_buf_log_item_t *);
 139 void    xfs_buf_attach_iodone(struct xfs_buf *,
 140                               void(*)(struct xfs_buf *, xfs_log_item_t *),
 141                               xfs_log_item_t *);
 142 void    xfs_buf_iodone_callbacks(struct xfs_buf *);
 143 void    xfs_buf_iodone(struct xfs_buf *, xfs_buf_log_item_t *);
 144
 145 #ifdef XFS_TRANS_DEBUG
 146 void
 147 xfs_buf_item_flush_log_debug(
 148         struct xfs_buf *bp,
 149         uint    first,
 150         uint    last);
 151 #else
 152 #define xfs_buf_item_flush_log_debug(bp, first, last)
 153 #endif
 154
 155 #endif  /* __KERNEL__ */
 156
 157 #endif  /* __XFS_BUF_ITEM_H__ */