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Diffstat (limited to 'fs/xfs/xfs_buf_item.h')
| -rw-r--r-- | fs/xfs/xfs_buf_item.h | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/fs/xfs/xfs_buf_item.h b/fs/xfs/xfs_buf_item.h new file mode 100644 index 000000000000..5f1b0c9308f6 --- /dev/null +++ b/fs/xfs/xfs_buf_item.h @@ -0,0 +1,171 @@ +/* + * Copyright (c) 2000-2001 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 +#define XFS_BLI_STALE_INODE 0x20 + + +#ifdef __KERNEL__ + +struct xfs_buf; +struct ktrace; +struct xfs_mount; +struct xfs_buf_log_item; + +#if defined(XFS_BLI_TRACE) +#define XFS_BLI_TRACE_SIZE 32 + +void xfs_buf_item_trace(char *, struct xfs_buf_log_item *); +#else +#define xfs_buf_item_trace(id, bip) +#endif + +/* + * 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 XFS_BLI_TRACE + 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; + +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 *); +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__ */ |