331b6cc0ea
Improve support for writing to XFS partitions. Work done by: Russell Cattelan <cattelan at xfs dot org>
158 lines
5.0 KiB
C
158 lines
5.0 KiB
C
/*
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* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_BUF_ITEM_H__
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#define __XFS_BUF_ITEM_H__
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/*
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* This is the structure used to lay out a buf log item in the
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* log. The data map describes which 128 byte chunks of the buffer
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* have been logged. This structure works only on buffers that
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* reside up to the first TB in the filesystem. These buffers are
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* generated only by pre-6.2 systems and are known as XFS_LI_6_1_BUF.
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*/
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typedef struct xfs_buf_log_format_v1 {
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unsigned short blf_type; /* buf log item type indicator */
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unsigned short blf_size; /* size of this item */
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__int32_t blf_blkno; /* starting blkno of this buf */
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ushort blf_flags; /* misc state */
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ushort blf_len; /* number of blocks in this buf */
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unsigned int blf_map_size; /* size of data bitmap in words */
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unsigned int blf_data_map[1];/* variable size bitmap of */
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/* regions of buffer in this item */
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} xfs_buf_log_format_v1_t;
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/*
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* This is a form of the above structure with a 64 bit blkno field.
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* For 6.2 and beyond, this is XFS_LI_BUF. We use this to log everything.
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*/
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typedef struct xfs_buf_log_format_t {
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unsigned short blf_type; /* buf log item type indicator */
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unsigned short blf_size; /* size of this item */
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ushort blf_flags; /* misc state */
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ushort blf_len; /* number of blocks in this buf */
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__int64_t blf_blkno; /* starting blkno of this buf */
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unsigned int blf_map_size; /* size of data bitmap in words */
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unsigned int blf_data_map[1];/* variable size bitmap of */
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/* regions of buffer in this item */
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} xfs_buf_log_format_t;
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/*
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* This flag indicates that the buffer contains on disk inodes
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* and requires special recovery handling.
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*/
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#define XFS_BLI_INODE_BUF 0x1
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/*
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* This flag indicates that the buffer should not be replayed
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* during recovery because its blocks are being freed.
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*/
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#define XFS_BLI_CANCEL 0x2
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/*
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* This flag indicates that the buffer contains on disk
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* user or group dquots and may require special recovery handling.
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*/
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#define XFS_BLI_UDQUOT_BUF 0x4
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#define XFS_BLI_PDQUOT_BUF 0x8
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#define XFS_BLI_GDQUOT_BUF 0x10
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#define XFS_BLI_CHUNK 128
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#define XFS_BLI_SHIFT 7
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#define BIT_TO_WORD_SHIFT 5
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#define NBWORD (NBBY * sizeof(unsigned int))
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/*
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* buf log item flags
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*/
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#define XFS_BLI_HOLD 0x01
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#define XFS_BLI_DIRTY 0x02
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#define XFS_BLI_STALE 0x04
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#define XFS_BLI_LOGGED 0x08
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#define XFS_BLI_INODE_ALLOC_BUF 0x10
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#define XFS_BLI_STALE_INODE 0x20
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#ifdef __KERNEL__
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struct xfs_buf;
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struct ktrace;
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struct xfs_mount;
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struct xfs_buf_log_item;
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#if defined(XFS_BLI_TRACE)
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#define XFS_BLI_TRACE_SIZE 32
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void xfs_buf_item_trace(char *, struct xfs_buf_log_item *);
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#else
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#define xfs_buf_item_trace(id, bip)
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#endif
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/*
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* This is the in core log item structure used to track information
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* needed to log buffers. It tracks how many times the lock has been
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* locked, and which 128 byte chunks of the buffer are dirty.
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*/
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typedef struct xfs_buf_log_item {
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xfs_log_item_t bli_item; /* common item structure */
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struct xfs_buf *bli_buf; /* real buffer pointer */
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unsigned int bli_flags; /* misc flags */
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unsigned int bli_recur; /* lock recursion count */
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atomic_t bli_refcount; /* cnt of tp refs */
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#ifdef XFS_BLI_TRACE
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struct ktrace *bli_trace; /* event trace buf */
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#endif
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#ifdef XFS_TRANS_DEBUG
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char *bli_orig; /* original buffer copy */
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char *bli_logged; /* bytes logged (bitmap) */
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#endif
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xfs_buf_log_format_t bli_format; /* in-log header */
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} xfs_buf_log_item_t;
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/*
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* This structure is used during recovery to record the buf log
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* items which have been canceled and should not be replayed.
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*/
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typedef struct xfs_buf_cancel {
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xfs_daddr_t bc_blkno;
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uint bc_len;
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int bc_refcount;
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struct xfs_buf_cancel *bc_next;
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} xfs_buf_cancel_t;
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void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
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void xfs_buf_item_relse(struct xfs_buf *);
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void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
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uint xfs_buf_item_dirty(xfs_buf_log_item_t *);
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void xfs_buf_attach_iodone(struct xfs_buf *,
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void(*)(struct xfs_buf *, xfs_log_item_t *),
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xfs_log_item_t *);
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void xfs_buf_iodone_callbacks(struct xfs_buf *);
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void xfs_buf_iodone(struct xfs_buf *, xfs_buf_log_item_t *);
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#ifdef XFS_TRANS_DEBUG
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void
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xfs_buf_item_flush_log_debug(
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struct xfs_buf *bp,
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uint first,
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uint last);
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#else
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#define xfs_buf_item_flush_log_debug(bp, first, last)
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#endif
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#endif /* __KERNEL__ */
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#endif /* __XFS_BUF_ITEM_H__ */
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