blob: 217f34af00cbe563aefe229116261416193e3b0f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18#ifndef __XFS_BUF_ITEM_H__
19#define __XFS_BUF_ITEM_H__
20
David Chinnera8272ce2007-11-23 16:28:09 +110021extern kmem_zone_t *xfs_buf_item_zone;
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023/*
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
Eric Sandeen804195b2007-02-10 18:35:02 +110026 * have been logged.
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 * 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
Nathan Scottc8ad20f2005-06-21 15:38:48 +100055#define XFS_BLI_PDQUOT_BUF 0x8
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#define XFS_BLI_GDQUOT_BUF 0x10
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
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
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000073#define XFS_BLI_FLAGS \
74 { XFS_BLI_HOLD, "HOLD" }, \
75 { XFS_BLI_DIRTY, "DIRTY" }, \
76 { XFS_BLI_STALE, "STALE" }, \
77 { XFS_BLI_LOGGED, "LOGGED" }, \
78 { XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \
79 { XFS_BLI_STALE_INODE, "STALE_INODE" }
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82#ifdef __KERNEL__
83
84struct xfs_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085struct xfs_mount;
86struct xfs_buf_log_item;
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088/*
89 * This is the in core log item structure used to track information
90 * needed to log buffers. It tracks how many times the lock has been
91 * locked, and which 128 byte chunks of the buffer are dirty.
92 */
93typedef struct xfs_buf_log_item {
94 xfs_log_item_t bli_item; /* common item structure */
95 struct xfs_buf *bli_buf; /* real buffer pointer */
96 unsigned int bli_flags; /* misc flags */
97 unsigned int bli_recur; /* lock recursion count */
98 atomic_t bli_refcount; /* cnt of tp refs */
Linus Torvalds1da177e2005-04-16 15:20:36 -070099#ifdef XFS_TRANS_DEBUG
100 char *bli_orig; /* original buffer copy */
101 char *bli_logged; /* bytes logged (bitmap) */
102#endif
103 xfs_buf_log_format_t bli_format; /* in-log header */
104} xfs_buf_log_item_t;
105
106/*
107 * This structure is used during recovery to record the buf log
108 * items which have been canceled and should not be replayed.
109 */
110typedef struct xfs_buf_cancel {
111 xfs_daddr_t bc_blkno;
112 uint bc_len;
113 int bc_refcount;
114 struct xfs_buf_cancel *bc_next;
115} xfs_buf_cancel_t;
116
117void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
118void xfs_buf_item_relse(struct xfs_buf *);
119void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
120uint xfs_buf_item_dirty(xfs_buf_log_item_t *);
121void xfs_buf_attach_iodone(struct xfs_buf *,
122 void(*)(struct xfs_buf *, xfs_log_item_t *),
123 xfs_log_item_t *);
124void xfs_buf_iodone_callbacks(struct xfs_buf *);
125void xfs_buf_iodone(struct xfs_buf *, xfs_buf_log_item_t *);
126
127#ifdef XFS_TRANS_DEBUG
128void
129xfs_buf_item_flush_log_debug(
130 struct xfs_buf *bp,
131 uint first,
132 uint last);
133#else
134#define xfs_buf_item_flush_log_debug(bp, first, last)
135#endif
136
137#endif /* __KERNEL__ */
138
139#endif /* __XFS_BUF_ITEM_H__ */