1/* 2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * 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. 13 * 14 * 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 17 */ 18#ifndef __XFS_BUF_ITEM_H__ 19#define __XFS_BUF_ITEM_H__ 20 21/* 22 * This is the structure used to lay out a buf log item in the 23 * log. The data map describes which 128 byte chunks of the buffer 24 * have been logged. 25 * For 6.2 and beyond, this is XFS_LI_BUF. We use this to log everything. 26 */ 27typedef struct xfs_buf_log_format_t { 28 unsigned short blf_type; /* buf log item type indicator */ 29 unsigned short blf_size; /* size of this item */ 30 ushort blf_flags; /* misc state */ 31 ushort blf_len; /* number of blocks in this buf */ 32 __int64_t blf_blkno; /* starting blkno of this buf */ 33 unsigned int blf_map_size; /* size of data bitmap in words */ 34 unsigned int blf_data_map[1];/* variable size bitmap of */ 35 /* regions of buffer in this item */ 36} xfs_buf_log_format_t; 37 38/* 39 * This flag indicates that the buffer contains on disk inodes 40 * and requires special recovery handling. 41 */ 42#define XFS_BLI_INODE_BUF 0x1 43/* 44 * This flag indicates that the buffer should not be replayed 45 * during recovery because its blocks are being freed. 46 */ 47#define XFS_BLI_CANCEL 0x2 48/* 49 * This flag indicates that the buffer contains on disk 50 * user or group dquots and may require special recovery handling. 51 */ 52#define XFS_BLI_UDQUOT_BUF 0x4 53#define XFS_BLI_PDQUOT_BUF 0x8 54#define XFS_BLI_GDQUOT_BUF 0x10 55 56#define XFS_BLI_CHUNK 128 57#define XFS_BLI_SHIFT 7 58#define BIT_TO_WORD_SHIFT 5 59#define NBWORD (NBBY * sizeof(unsigned int)) 60 61/* 62 * buf log item flags 63 */ 64#define XFS_BLI_HOLD 0x01 65#define XFS_BLI_DIRTY 0x02 66#define XFS_BLI_STALE 0x04 67#define XFS_BLI_LOGGED 0x08 68#define XFS_BLI_INODE_ALLOC_BUF 0x10 69#define XFS_BLI_STALE_INODE 0x20 70 71 72#ifdef __KERNEL__ 73 74struct xfs_buf; 75struct ktrace; 76struct xfs_mount; 77struct xfs_buf_log_item; 78 79#if defined(XFS_BLI_TRACE) 80#define XFS_BLI_TRACE_SIZE 32 81 82void xfs_buf_item_trace(char *, struct xfs_buf_log_item *); 83#else 84#define xfs_buf_item_trace(id, bip) 85#endif 86 87/* 88 * This is the in core log item structure used to track information 89 * needed to log buffers. It tracks how many times the lock has been 90 * locked, and which 128 byte chunks of the buffer are dirty. 91 */ 92typedef struct xfs_buf_log_item { 93 xfs_log_item_t bli_item; /* common item structure */ 94 struct xfs_buf *bli_buf; /* real buffer pointer */ 95 unsigned int bli_flags; /* misc flags */ 96 unsigned int bli_recur; /* lock recursion count */ 97 atomic_t bli_refcount; /* cnt of tp refs */ 98#ifdef XFS_BLI_TRACE 99 struct ktrace *bli_trace; /* event trace buf */ 100#endif 101#ifdef XFS_TRANS_DEBUG 102 char *bli_orig; /* original buffer copy */ 103 char *bli_logged; /* bytes logged (bitmap) */ 104#endif 105 xfs_buf_log_format_t bli_format; /* in-log header */ 106} xfs_buf_log_item_t; 107 108/* 109 * This structure is used during recovery to record the buf log 110 * items which have been canceled and should not be replayed. 111 */ 112typedef struct xfs_buf_cancel { 113 xfs_daddr_t bc_blkno; 114 uint bc_len; 115 int bc_refcount; 116 struct xfs_buf_cancel *bc_next; 117} xfs_buf_cancel_t; 118 119void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *); 120void xfs_buf_item_relse(struct xfs_buf *); 121void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint); 122uint xfs_buf_item_dirty(xfs_buf_log_item_t *); 123void xfs_buf_attach_iodone(struct xfs_buf *, 124 void(*)(struct xfs_buf *, xfs_log_item_t *), 125 xfs_log_item_t *); 126void xfs_buf_iodone_callbacks(struct xfs_buf *); 127void xfs_buf_iodone(struct xfs_buf *, xfs_buf_log_item_t *); 128 129#ifdef XFS_TRANS_DEBUG 130void 131xfs_buf_item_flush_log_debug( 132 struct xfs_buf *bp, 133 uint first, 134 uint last); 135#else 136#define xfs_buf_item_flush_log_debug(bp, first, last) 137#endif 138 139#endif /* __KERNEL__ */ 140 141#endif /* __XFS_BUF_ITEM_H__ */ 142