Merge master.kernel.org:/home/rmk/linux-2.6-mmc
[linux-2.6/mini2440.git] / fs / xfs / xfs_buf_item.h
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1 /*
2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
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__
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.
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;
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.
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;
55 * This flag indicates that the buffer contains on disk inodes
56 * and requires special recovery handling.
58 #define XFS_BLI_INODE_BUF 0x1
60 * This flag indicates that the buffer should not be replayed
61 * during recovery because its blocks are being freed.
63 #define XFS_BLI_CANCEL 0x2
65 * This flag indicates that the buffer contains on disk
66 * user or group dquots and may require special recovery handling.
68 #define XFS_BLI_UDQUOT_BUF 0x4
69 #define XFS_BLI_PDQUOT_BUF 0x8
70 #define XFS_BLI_GDQUOT_BUF 0x10
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))
78 * buf log item flags
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
88 #ifdef __KERNEL__
90 struct xfs_buf;
91 struct ktrace;
92 struct xfs_mount;
93 struct xfs_buf_log_item;
95 #if defined(XFS_BLI_TRACE)
96 #define XFS_BLI_TRACE_SIZE 32
98 void xfs_buf_item_trace(char *, struct xfs_buf_log_item *);
99 #else
100 #define xfs_buf_item_trace(id, bip)
101 #endif
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.
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;
125 * This structure is used during recovery to record the buf log
126 * items which have been canceled and should not be replayed.
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;
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 *);
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
155 #endif /* __KERNEL__ */
157 #endif /* __XFS_BUF_ITEM_H__ */