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 /* kernel only definitions */
  22
  23 /* buf log item flags */
  24 #define XFS_BLI_HOLD            0x01
  25 #define XFS_BLI_DIRTY           0x02
  26 #define XFS_BLI_STALE           0x04
  27 #define XFS_BLI_LOGGED          0x08
  28 #define XFS_BLI_INODE_ALLOC_BUF 0x10
  29 #define XFS_BLI_STALE_INODE     0x20
  30 #define XFS_BLI_INODE_BUF       0x40
  31 #define XFS_BLI_ORDERED         0x80
  32
  33 #define XFS_BLI_FLAGS \
  34         { XFS_BLI_HOLD,         "HOLD" }, \
  35         { XFS_BLI_DIRTY,        "DIRTY" }, \
  36         { XFS_BLI_STALE,        "STALE" }, \
  37         { XFS_BLI_LOGGED,       "LOGGED" }, \
  38         { XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \
  39         { XFS_BLI_STALE_INODE,  "STALE_INODE" }, \
  40         { XFS_BLI_INODE_BUF,    "INODE_BUF" }, \
  41         { XFS_BLI_ORDERED,      "ORDERED" }
  42
  43
  44 struct xfs_buf;
  45 struct xfs_mount;
  46 struct xfs_buf_log_item;
  47
  48 /*
  49  * This is the in core log item structure used to track information
  50  * needed to log buffers.  It tracks how many times the lock has been
  51  * locked, and which 128 byte chunks of the buffer are dirty.
  52  */
  53 typedef struct xfs_buf_log_item {
  54         xfs_log_item_t          bli_item;       /* common item structure */
  55         struct xfs_buf          *bli_buf;       /* real buffer pointer */
  56         unsigned int            bli_flags;      /* misc flags */
  57         unsigned int            bli_recur;      /* lock recursion count */
  58         atomic_t                bli_refcount;   /* cnt of tp refs */
  59         int                     bli_format_count;       /* count of headers */
  60         struct xfs_buf_log_format *bli_formats; /* array of in-log header ptrs */
  61         struct xfs_buf_log_format __bli_format; /* embedded in-log header */
  62 } xfs_buf_log_item_t;
  63
  64 int     xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
  65 void    xfs_buf_item_relse(struct xfs_buf *);
  66 void    xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
  67 uint    xfs_buf_item_dirty(xfs_buf_log_item_t *);
  68 void    xfs_buf_attach_iodone(struct xfs_buf *,
  69                               void(*)(struct xfs_buf *, xfs_log_item_t *),
  70                               xfs_log_item_t *);
  71 void    xfs_buf_iodone_callbacks(struct xfs_buf *);
  72 void    xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *);
  73
  74 extern kmem_zone_t      *xfs_buf_item_zone;
  75
  76 #endif  /* __XFS_BUF_ITEM_H__ */