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/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#ifndef __XFS_BUF_ITEM_H__
#define __XFS_BUF_ITEM_H__
/*
* This is the structure used to lay out a buf log item in the
* log. The data map describes which 128 byte chunks of the buffer
* have been logged. This structure works only on buffers that
* reside up to the first TB in the filesystem. These buffers are
* generated only by pre-6.2 systems and are known as XFS_LI_6_1_BUF.
*/
typedef struct xfs_buf_log_format_v1 {
unsigned short blf_type; /* buf log item type indicator */
unsigned short blf_size; /* size of this item */
__int32_t blf_blkno; /* starting blkno of this buf */
ushort blf_flags; /* misc state */
ushort blf_len; /* number of blocks in this buf */
unsigned int blf_map_size; /* size of data bitmap in words */
unsigned int blf_data_map[1];/* variable size bitmap of */
/* regions of buffer in this item */
} xfs_buf_log_format_v1_t;
/*
* This is a form of the above structure with a 64 bit blkno field.
* For 6.2 and beyond, this is XFS_LI_BUF. We use this to log everything.
*/
typedef struct xfs_buf_log_format_t {
unsigned short blf_type; /* buf log item type indicator */
unsigned short blf_size; /* size of this item */
ushort blf_flags; /* misc state */
ushort blf_len; /* number of blocks in this buf */
__int64_t blf_blkno; /* starting blkno of this buf */
unsigned int blf_map_size; /* size of data bitmap in words */
unsigned int blf_data_map[1];/* variable size bitmap of */
/* regions of buffer in this item */
} xfs_buf_log_format_t;
/*
* This flag indicates that the buffer contains on disk inodes
* and requires special recovery handling.
*/
#define XFS_BLI_INODE_BUF 0x1
/*
* This flag indicates that the buffer should not be replayed
* during recovery because its blocks are being freed.
*/
#define XFS_BLI_CANCEL 0x2
/*
* This flag indicates that the buffer contains on disk
* user or group dquots and may require special recovery handling.
*/
#define XFS_BLI_UDQUOT_BUF 0x4
/* #define XFS_BLI_PDQUOT_BUF 0x8 */
#define XFS_BLI_GDQUOT_BUF 0x10
#define XFS_BLI_CHUNK 128
#define XFS_BLI_SHIFT 7
#define BIT_TO_WORD_SHIFT 5
#define NBWORD (NBBY * sizeof(unsigned int))
/*
* buf log item flags
*/
#define XFS_BLI_HOLD 0x01
#define XFS_BLI_DIRTY 0x02
#define XFS_BLI_STALE 0x04
#define XFS_BLI_LOGGED 0x08
#define XFS_BLI_INODE_ALLOC_BUF 0x10
#ifdef __KERNEL__
struct xfs_buf;
struct ktrace;
struct xfs_mount;
/*
* This is the in core log item structure used to track information
* needed to log buffers. It tracks how many times the lock has been
* locked, and which 128 byte chunks of the buffer are dirty.
*/
typedef struct xfs_buf_log_item {
xfs_log_item_t bli_item; /* common item structure */
struct xfs_buf *bli_buf; /* real buffer pointer */
unsigned int bli_flags; /* misc flags */
unsigned int bli_recur; /* lock recursion count */
atomic_t bli_refcount; /* cnt of tp refs */
#ifdef DEBUG
struct ktrace *bli_trace; /* event trace buf */
#endif
#ifdef XFS_TRANS_DEBUG
char *bli_orig; /* original buffer copy */
char *bli_logged; /* bytes logged (bitmap) */
#endif
xfs_buf_log_format_t bli_format; /* in-log header */
} xfs_buf_log_item_t;
/*
* This structure is used during recovery to record the buf log
* items which have been canceled and should not be replayed.
*/
typedef struct xfs_buf_cancel {
xfs_daddr_t bc_blkno;
uint bc_len;
int bc_refcount;
struct xfs_buf_cancel *bc_next;
} xfs_buf_cancel_t;
#define XFS_BLI_TRACE_SIZE 32
#if defined(XFS_ALL_TRACE)
#define XFS_BLI_TRACE
#endif
#if !defined(DEBUG)
#undef XFS_BLI_TRACE
#endif
#if defined(XFS_BLI_TRACE)
void xfs_buf_item_trace(char *, xfs_buf_log_item_t *);
#else
#define xfs_buf_item_trace(id, bip)
#endif
void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
void xfs_buf_item_relse(struct xfs_buf *);
void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
uint xfs_buf_item_dirty(xfs_buf_log_item_t *);
int xfs_buf_item_bits(uint *, uint, uint);
int xfs_buf_item_contig_bits(uint *, uint, uint);
int xfs_buf_item_next_bit(uint *, uint, uint);
void xfs_buf_attach_iodone(struct xfs_buf *,
void(*)(struct xfs_buf *, xfs_log_item_t *),
xfs_log_item_t *);
void xfs_buf_iodone_callbacks(struct xfs_buf *);
void xfs_buf_iodone(struct xfs_buf *, xfs_buf_log_item_t *);
#ifdef XFS_TRANS_DEBUG
void
xfs_buf_item_flush_log_debug(
struct xfs_buf *bp,
uint first,
uint last);
#else
#define xfs_buf_item_flush_log_debug(bp, first, last)
#endif
#endif /* __KERNEL__ */
#endif /* __XFS_BUF_ITEM_H__ */
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