2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
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.
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.
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
18 #ifndef __XFS_BUF_ITEM_H__
19 #define __XFS_BUF_ITEM_H__
21 extern kmem_zone_t *xfs_buf_item_zone;
24 * This flag indicates that the buffer contains on disk inodes
25 * and requires special recovery handling.
27 #define XFS_BLF_INODE_BUF (1<<0)
29 * This flag indicates that the buffer should not be replayed
30 * during recovery because its blocks are being freed.
32 #define XFS_BLF_CANCEL (1<<1)
35 * This flag indicates that the buffer contains on disk
36 * user or group dquots and may require special recovery handling.
38 #define XFS_BLF_UDQUOT_BUF (1<<2)
39 #define XFS_BLF_PDQUOT_BUF (1<<3)
40 #define XFS_BLF_GDQUOT_BUF (1<<4)
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.
47 #define XFS_BLF_BTREE_BUF (1<<5)
48 #define XFS_BLF_AGF_BUF (1<<6)
49 #define XFS_BLF_AGFL_BUF (1<<7)
50 #define XFS_BLF_AGI_BUF (1<<8)
51 #define XFS_BLF_DINO_BUF (1<<9)
52 #define XFS_BLF_SYMLINK_BUF (1<<10)
54 #define XFS_BLF_TYPE_MASK \
55 (XFS_BLF_UDQUOT_BUF | \
56 XFS_BLF_PDQUOT_BUF | \
57 XFS_BLF_GDQUOT_BUF | \
65 #define XFS_BLF_CHUNK 128
66 #define XFS_BLF_SHIFT 7
67 #define BIT_TO_WORD_SHIFT 5
68 #define NBWORD (NBBY * sizeof(unsigned int))
71 * This is the structure used to lay out a buf log item in the
72 * log. The data map describes which 128 byte chunks of the buffer
75 #define XFS_BLF_DATAMAP_SIZE ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD)
77 typedef struct xfs_buf_log_format {
78 unsigned short blf_type; /* buf log item type indicator */
79 unsigned short blf_size; /* size of this item */
80 ushort blf_flags; /* misc state */
81 ushort blf_len; /* number of blocks in this buf */
82 __int64_t blf_blkno; /* starting blkno of this buf */
83 unsigned int blf_map_size; /* used size of data bitmap in words */
84 unsigned int blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */
85 } xfs_buf_log_format_t;
90 #define XFS_BLI_HOLD 0x01
91 #define XFS_BLI_DIRTY 0x02
92 #define XFS_BLI_STALE 0x04
93 #define XFS_BLI_LOGGED 0x08
94 #define XFS_BLI_INODE_ALLOC_BUF 0x10
95 #define XFS_BLI_STALE_INODE 0x20
96 #define XFS_BLI_INODE_BUF 0x40
98 #define XFS_BLI_FLAGS \
99 { XFS_BLI_HOLD, "HOLD" }, \
100 { XFS_BLI_DIRTY, "DIRTY" }, \
101 { XFS_BLI_STALE, "STALE" }, \
102 { XFS_BLI_LOGGED, "LOGGED" }, \
103 { XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \
104 { XFS_BLI_STALE_INODE, "STALE_INODE" }, \
105 { XFS_BLI_INODE_BUF, "INODE_BUF" }
112 struct xfs_buf_log_item;
115 * This is the in core log item structure used to track information
116 * needed to log buffers. It tracks how many times the lock has been
117 * locked, and which 128 byte chunks of the buffer are dirty.
119 typedef struct xfs_buf_log_item {
120 xfs_log_item_t bli_item; /* common item structure */
121 struct xfs_buf *bli_buf; /* real buffer pointer */
122 unsigned int bli_flags; /* misc flags */
123 unsigned int bli_recur; /* lock recursion count */
124 atomic_t bli_refcount; /* cnt of tp refs */
125 int bli_format_count; /* count of headers */
126 struct xfs_buf_log_format *bli_formats; /* array of in-log header ptrs */
127 struct xfs_buf_log_format __bli_format; /* embedded in-log header */
128 } xfs_buf_log_item_t;
130 void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
131 void xfs_buf_item_relse(struct xfs_buf *);
132 void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
133 uint xfs_buf_item_dirty(xfs_buf_log_item_t *);
134 void xfs_buf_attach_iodone(struct xfs_buf *,
135 void(*)(struct xfs_buf *, xfs_log_item_t *),
137 void xfs_buf_iodone_callbacks(struct xfs_buf *);
138 void xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *);
140 #endif /* __KERNEL__ */
142 #endif /* __XFS_BUF_ITEM_H__ */