• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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  void	xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
109  void	xfs_buf_item_relse(struct xfs_buf *);
110  void	xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
111  uint	xfs_buf_item_dirty(xfs_buf_log_item_t *);
112  void	xfs_buf_attach_iodone(struct xfs_buf *,
113  			      void(*)(struct xfs_buf *, xfs_log_item_t *),
114  			      xfs_log_item_t *);
115  void	xfs_buf_iodone_callbacks(struct xfs_buf *);
116  void	xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *);
117  
118  #ifdef XFS_TRANS_DEBUG
119  void
120  xfs_buf_item_flush_log_debug(
121  	struct xfs_buf *bp,
122  	uint	first,
123  	uint	last);
124  #else
125  #define	xfs_buf_item_flush_log_debug(bp, first, last)
126  #endif
127  
128  #endif	/* __KERNEL__ */
129  
130  #endif	/* __XFS_BUF_ITEM_H__ */
131