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+/*
+ * 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__ */
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