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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/xfs/xfs_buf_item.h
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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1/*
2 * Copyright (c) 2000-2001 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32#ifndef __XFS_BUF_ITEM_H__
33#define __XFS_BUF_ITEM_H__
34
35/*
36 * This is the structure used to lay out a buf log item in the
37 * log. The data map describes which 128 byte chunks of the buffer
38 * have been logged. This structure works only on buffers that
39 * reside up to the first TB in the filesystem. These buffers are
40 * generated only by pre-6.2 systems and are known as XFS_LI_6_1_BUF.
41 */
42typedef struct xfs_buf_log_format_v1 {
43 unsigned short blf_type; /* buf log item type indicator */
44 unsigned short blf_size; /* size of this item */
45 __int32_t blf_blkno; /* starting blkno of this buf */
46 ushort blf_flags; /* misc state */
47 ushort blf_len; /* number of blocks in this buf */
48 unsigned int blf_map_size; /* size of data bitmap in words */
49 unsigned int blf_data_map[1];/* variable size bitmap of */
50 /* regions of buffer in this item */
51} xfs_buf_log_format_v1_t;
52
53/*
54 * This is a form of the above structure with a 64 bit blkno field.
55 * For 6.2 and beyond, this is XFS_LI_BUF. We use this to log everything.
56 */
57typedef struct xfs_buf_log_format_t {
58 unsigned short blf_type; /* buf log item type indicator */
59 unsigned short blf_size; /* size of this item */
60 ushort blf_flags; /* misc state */
61 ushort blf_len; /* number of blocks in this buf */
62 __int64_t blf_blkno; /* starting blkno of this buf */
63 unsigned int blf_map_size; /* size of data bitmap in words */
64 unsigned int blf_data_map[1];/* variable size bitmap of */
65 /* regions of buffer in this item */
66} xfs_buf_log_format_t;
67
68/*
69 * This flag indicates that the buffer contains on disk inodes
70 * and requires special recovery handling.
71 */
72#define XFS_BLI_INODE_BUF 0x1
73/*
74 * This flag indicates that the buffer should not be replayed
75 * during recovery because its blocks are being freed.
76 */
77#define XFS_BLI_CANCEL 0x2
78/*
79 * This flag indicates that the buffer contains on disk
80 * user or group dquots and may require special recovery handling.
81 */
82#define XFS_BLI_UDQUOT_BUF 0x4
83/* #define XFS_BLI_PDQUOT_BUF 0x8 */
84#define XFS_BLI_GDQUOT_BUF 0x10
85
86#define XFS_BLI_CHUNK 128
87#define XFS_BLI_SHIFT 7
88#define BIT_TO_WORD_SHIFT 5
89#define NBWORD (NBBY * sizeof(unsigned int))
90
91/*
92 * buf log item flags
93 */
94#define XFS_BLI_HOLD 0x01
95#define XFS_BLI_DIRTY 0x02
96#define XFS_BLI_STALE 0x04
97#define XFS_BLI_LOGGED 0x08
98#define XFS_BLI_INODE_ALLOC_BUF 0x10
99#define XFS_BLI_STALE_INODE 0x20
100
101
102#ifdef __KERNEL__
103
104struct xfs_buf;
105struct ktrace;
106struct xfs_mount;
107struct xfs_buf_log_item;
108
109#if defined(XFS_BLI_TRACE)
110#define XFS_BLI_TRACE_SIZE 32
111
112void xfs_buf_item_trace(char *, struct xfs_buf_log_item *);
113#else
114#define xfs_buf_item_trace(id, bip)
115#endif
116
117/*
118 * This is the in core log item structure used to track information
119 * needed to log buffers. It tracks how many times the lock has been
120 * locked, and which 128 byte chunks of the buffer are dirty.
121 */
122typedef struct xfs_buf_log_item {
123 xfs_log_item_t bli_item; /* common item structure */
124 struct xfs_buf *bli_buf; /* real buffer pointer */
125 unsigned int bli_flags; /* misc flags */
126 unsigned int bli_recur; /* lock recursion count */
127 atomic_t bli_refcount; /* cnt of tp refs */
128#ifdef XFS_BLI_TRACE
129 struct ktrace *bli_trace; /* event trace buf */
130#endif
131#ifdef XFS_TRANS_DEBUG
132 char *bli_orig; /* original buffer copy */
133 char *bli_logged; /* bytes logged (bitmap) */
134#endif
135 xfs_buf_log_format_t bli_format; /* in-log header */
136} xfs_buf_log_item_t;
137
138/*
139 * This structure is used during recovery to record the buf log
140 * items which have been canceled and should not be replayed.
141 */
142typedef struct xfs_buf_cancel {
143 xfs_daddr_t bc_blkno;
144 uint bc_len;
145 int bc_refcount;
146 struct xfs_buf_cancel *bc_next;
147} xfs_buf_cancel_t;
148
149void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
150void xfs_buf_item_relse(struct xfs_buf *);
151void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
152uint xfs_buf_item_dirty(xfs_buf_log_item_t *);
153void xfs_buf_attach_iodone(struct xfs_buf *,
154 void(*)(struct xfs_buf *, xfs_log_item_t *),
155 xfs_log_item_t *);
156void xfs_buf_iodone_callbacks(struct xfs_buf *);
157void xfs_buf_iodone(struct xfs_buf *, xfs_buf_log_item_t *);
158
159#ifdef XFS_TRANS_DEBUG
160void
161xfs_buf_item_flush_log_debug(
162 struct xfs_buf *bp,
163 uint first,
164 uint last);
165#else
166#define xfs_buf_item_flush_log_debug(bp, first, last)
167#endif
168
169#endif /* __KERNEL__ */
170
171#endif /* __XFS_BUF_ITEM_H__ */