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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/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 * This flag indicates that the buffer contains on disk inodes
25 * and requires special recovery handling.
26 */
Dave Chinnerc1155412010-05-07 11:05:19 +100027#define XFS_BLF_INODE_BUF 0x1
Linus Torvalds1da177e2005-04-16 15:20:36 -070028/*
29 * This flag indicates that the buffer should not be replayed
30 * during recovery because its blocks are being freed.
31 */
Dave Chinnerc1155412010-05-07 11:05:19 +100032#define XFS_BLF_CANCEL 0x2
Linus Torvalds1da177e2005-04-16 15:20:36 -070033/*
34 * This flag indicates that the buffer contains on disk
35 * user or group dquots and may require special recovery handling.
36 */
Dave Chinnerc1155412010-05-07 11:05:19 +100037#define XFS_BLF_UDQUOT_BUF 0x4
38#define XFS_BLF_PDQUOT_BUF 0x8
39#define XFS_BLF_GDQUOT_BUF 0x10
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Dave Chinnerc1155412010-05-07 11:05:19 +100041#define XFS_BLF_CHUNK 128
42#define XFS_BLF_SHIFT 7
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#define BIT_TO_WORD_SHIFT 5
44#define NBWORD (NBBY * sizeof(unsigned int))
45
46/*
Dave Chinner77c1a082012-06-22 18:50:07 +100047 * This is the structure used to lay out a buf log item in the
48 * log. The data map describes which 128 byte chunks of the buffer
49 * have been logged.
50 */
51#define XFS_BLF_DATAMAP_SIZE ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD)
52
53typedef struct xfs_buf_log_format {
54 unsigned short blf_type; /* buf log item type indicator */
55 unsigned short blf_size; /* size of this item */
56 ushort blf_flags; /* misc state */
57 ushort blf_len; /* number of blocks in this buf */
58 __int64_t blf_blkno; /* starting blkno of this buf */
59 unsigned int blf_map_size; /* used size of data bitmap in words */
60 unsigned int blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */
61} xfs_buf_log_format_t;
62
63/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 * 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
Dave Chinnerccf7c232010-05-20 23:19:42 +100072#define XFS_BLI_INODE_BUF 0x40
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000074#define XFS_BLI_FLAGS \
75 { XFS_BLI_HOLD, "HOLD" }, \
76 { XFS_BLI_DIRTY, "DIRTY" }, \
77 { XFS_BLI_STALE, "STALE" }, \
78 { XFS_BLI_LOGGED, "LOGGED" }, \
79 { XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \
Dave Chinnerccf7c232010-05-20 23:19:42 +100080 { XFS_BLI_STALE_INODE, "STALE_INODE" }, \
81 { XFS_BLI_INODE_BUF, "INODE_BUF" }
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000082
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84#ifdef __KERNEL__
85
86struct xfs_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087struct xfs_mount;
88struct xfs_buf_log_item;
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090/*
91 * This is the in core log item structure used to track information
92 * needed to log buffers. It tracks how many times the lock has been
93 * locked, and which 128 byte chunks of the buffer are dirty.
94 */
95typedef struct xfs_buf_log_item {
96 xfs_log_item_t bli_item; /* common item structure */
97 struct xfs_buf *bli_buf; /* real buffer pointer */
98 unsigned int bli_flags; /* misc flags */
99 unsigned int bli_recur; /* lock recursion count */
100 atomic_t bli_refcount; /* cnt of tp refs */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101#ifdef XFS_TRANS_DEBUG
102 char *bli_orig; /* original buffer copy */
103 char *bli_logged; /* bytes logged (bitmap) */
104#endif
Dave Chinner372cc85e2012-06-22 18:50:12 +1000105 int bli_format_count; /* count of headers */
106 struct xfs_buf_log_format *bli_formats; /* array of in-log header ptrs */
Dave Chinner77c1a082012-06-22 18:50:07 +1000107 struct xfs_buf_log_format bli_format; /* embedded in-log header */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108} xfs_buf_log_item_t;
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
111void xfs_buf_item_relse(struct xfs_buf *);
112void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
113uint xfs_buf_item_dirty(xfs_buf_log_item_t *);
114void xfs_buf_attach_iodone(struct xfs_buf *,
115 void(*)(struct xfs_buf *, xfs_log_item_t *),
116 xfs_log_item_t *);
117void xfs_buf_iodone_callbacks(struct xfs_buf *);
Christoph Hellwigca30b2a2010-06-23 18:11:15 +1000118void xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120#ifdef XFS_TRANS_DEBUG
121void
122xfs_buf_item_flush_log_debug(
123 struct xfs_buf *bp,
124 uint first,
125 uint last);
126#else
127#define xfs_buf_item_flush_log_debug(bp, first, last)
128#endif
129
130#endif /* __KERNEL__ */
131
132#endif /* __XFS_BUF_ITEM_H__ */