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