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. This structure works only on buffers that 25 * reside up to the first TB in the filesystem. These buffers are 26 * generated only by pre-6.2 systems and are known as XFS_LI_6_1_BUF. 27 */ 28 typedef struct xfs_buf_log_format_v1 { 29 unsigned short blf_type; /* buf log item type indicator */ 30 unsigned short blf_size; /* size of this item */ 31 __int32_t blf_blkno; /* starting blkno of this buf */ 32 ushort blf_flags; /* misc state */ 33 ushort blf_len; /* number of blocks in this buf */ 34 unsigned int blf_map_size; /* size of data bitmap in words */ 35 unsigned int blf_data_map[1];/* variable size bitmap of */ 36 /* regions of buffer in this item */ 37 } xfs_buf_log_format_v1_t; 38 39 /* 40 * This is a form of the above structure with a 64 bit blkno field. 41 * For 6.2 and beyond, this is XFS_LI_BUF. We use this to log everything. 42 */ 43 typedef struct xfs_buf_log_format_t { 44 unsigned short blf_type; /* buf log item type indicator */ 45 unsigned short blf_size; /* size of this item */ 46 ushort blf_flags; /* misc state */ 47 ushort blf_len; /* number of blocks in this buf */ 48 __int64_t blf_blkno; /* starting blkno of this buf */ 49 unsigned int blf_map_size; /* size of data bitmap in words */ 50 unsigned int blf_data_map[1];/* variable size bitmap of */ 51 /* regions of buffer in this item */ 52 } xfs_buf_log_format_t; 53 54 /* 55 * This flag indicates that the buffer contains on disk inodes 56 * and requires special recovery handling. 57 */ 58 #define XFS_BLI_INODE_BUF 0x1 59 /* 60 * This flag indicates that the buffer should not be replayed 61 * during recovery because its blocks are being freed. 62 */ 63 #define XFS_BLI_CANCEL 0x2 64 /* 65 * This flag indicates that the buffer contains on disk 66 * user or group dquots and may require special recovery handling. 67 */ 68 #define XFS_BLI_UDQUOT_BUF 0x4 69 #define XFS_BLI_PDQUOT_BUF 0x8 70 #define XFS_BLI_GDQUOT_BUF 0x10 71 72 #define XFS_BLI_CHUNK 128 73 #define XFS_BLI_SHIFT 7 74 #define BIT_TO_WORD_SHIFT 5 75 #define NBWORD (NBBY * sizeof(unsigned int)) 76 77 /* 78 * buf log item flags 79 */ 80 #define XFS_BLI_HOLD 0x01 81 #define XFS_BLI_DIRTY 0x02 82 #define XFS_BLI_STALE 0x04 83 #define XFS_BLI_LOGGED 0x08 84 #define XFS_BLI_INODE_ALLOC_BUF 0x10 85 #define XFS_BLI_STALE_INODE 0x20 86 87 88 #ifdef __KERNEL__ 89 90 struct xfs_buf; 91 struct ktrace; 92 struct xfs_mount; 93 struct xfs_buf_log_item; 94 95 #if defined(XFS_BLI_TRACE) 96 #define XFS_BLI_TRACE_SIZE 32 97 98 void xfs_buf_item_trace(char *, struct xfs_buf_log_item *); 99 #else 100 #define xfs_buf_item_trace(id, bip) 101 #endif 102 103 /* 104 * This is the in core log item structure used to track information 105 * needed to log buffers. It tracks how many times the lock has been 106 * locked, and which 128 byte chunks of the buffer are dirty. 107 */ 108 typedef struct xfs_buf_log_item { 109 xfs_log_item_t bli_item; /* common item structure */ 110 struct xfs_buf *bli_buf; /* real buffer pointer */ 111 unsigned int bli_flags; /* misc flags */ 112 unsigned int bli_recur; /* lock recursion count */ 113 atomic_t bli_refcount; /* cnt of tp refs */ 114 #ifdef XFS_BLI_TRACE 115 struct ktrace *bli_trace; /* event trace buf */ 116 #endif 117 #ifdef XFS_TRANS_DEBUG 118 char *bli_orig; /* original buffer copy */ 119 char *bli_logged; /* bytes logged (bitmap) */ 120 #endif 121 xfs_buf_log_format_t bli_format; /* in-log header */ 122 } xfs_buf_log_item_t; 123 124 /* 125 * This structure is used during recovery to record the buf log 126 * items which have been canceled and should not be replayed. 127 */ 128 typedef struct xfs_buf_cancel { 129 xfs_daddr_t bc_blkno; 130 uint bc_len; 131 int bc_refcount; 132 struct xfs_buf_cancel *bc_next; 133 } xfs_buf_cancel_t; 134 135 void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *); 136 void xfs_buf_item_relse(struct xfs_buf *); 137 void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint); 138 uint xfs_buf_item_dirty(xfs_buf_log_item_t *); 139 void xfs_buf_attach_iodone(struct xfs_buf *, 140 void(*)(struct xfs_buf *, xfs_log_item_t *), 141 xfs_log_item_t *); 142 void xfs_buf_iodone_callbacks(struct xfs_buf *); 143 void xfs_buf_iodone(struct xfs_buf *, xfs_buf_log_item_t *); 144 145 #ifdef XFS_TRANS_DEBUG 146 void 147 xfs_buf_item_flush_log_debug( 148 struct xfs_buf *bp, 149 uint first, 150 uint last); 151 #else 152 #define xfs_buf_item_flush_log_debug(bp, first, last) 153 #endif 154 155 #endif /* __KERNEL__ */ 156 157 #endif /* __XFS_BUF_ITEM_H__ */ 158