tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
21extern 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 */
29typedef struct xfs_buf_log_format_t {
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_BLI_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_BLI_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_BLI_UDQUOT_BUF 0x4
55#define XFS_BLI_PDQUOT_BUF 0x8
56#define XFS_BLI_GDQUOT_BUF 0x10
57
58#define XFS_BLI_CHUNK 128
59#define XFS_BLI_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
73
74#ifdef __KERNEL__
75
76struct xfs_buf;
77struct ktrace;
78struct xfs_mount;
79struct xfs_buf_log_item;
80
81#if defined(XFS_BLI_TRACE)
82#define XFS_BLI_TRACE_SIZE 32
83
84void xfs_buf_item_trace(char *, struct xfs_buf_log_item *);
85#else
86#define xfs_buf_item_trace(id, bip)
87#endif
88
89/*
90 * This is the in core log item structure used to track information
91 * needed to log buffers. It tracks how many times the lock has been
92 * locked, and which 128 byte chunks of the buffer are dirty.
93 */
94typedef struct xfs_buf_log_item {
95 xfs_log_item_t bli_item; /* common item structure */
96 struct xfs_buf *bli_buf; /* real buffer pointer */
97 unsigned int bli_flags; /* misc flags */
98 unsigned int bli_recur; /* lock recursion count */
99 atomic_t bli_refcount; /* cnt of tp refs */
100#ifdef XFS_BLI_TRACE
101 struct ktrace *bli_trace; /* event trace buf */
102#endif
103#ifdef XFS_TRANS_DEBUG
104 char *bli_orig; /* original buffer copy */
105 char *bli_logged; /* bytes logged (bitmap) */
106#endif
107 xfs_buf_log_format_t bli_format; /* in-log header */
108} xfs_buf_log_item_t;
109
110/*
111 * This structure is used during recovery to record the buf log
112 * items which have been canceled and should not be replayed.
113 */
114typedef struct xfs_buf_cancel {
115 xfs_daddr_t bc_blkno;
116 uint bc_len;
117 int bc_refcount;
118 struct xfs_buf_cancel *bc_next;
119} xfs_buf_cancel_t;
120
121void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
122void xfs_buf_item_relse(struct xfs_buf *);
123void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
124uint xfs_buf_item_dirty(xfs_buf_log_item_t *);
125void xfs_buf_attach_iodone(struct xfs_buf *,
126 void(*)(struct xfs_buf *, xfs_log_item_t *),
127 xfs_log_item_t *);
128void xfs_buf_iodone_callbacks(struct xfs_buf *);
129void xfs_buf_iodone(struct xfs_buf *, xfs_buf_log_item_t *);
130
131#ifdef XFS_TRANS_DEBUG
132void
133xfs_buf_item_flush_log_debug(
134 struct xfs_buf *bp,
135 uint first,
136 uint last);
137#else
138#define xfs_buf_item_flush_log_debug(bp, first, last)
139#endif
140
141#endif /* __KERNEL__ */
142
143#endif /* __XFS_BUF_ITEM_H__ */