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 flag indicates that the buffer contains on disk inodes 25 * and requires special recovery handling. 26 */ 27 #define XFS_BLF_INODE_BUF 0x1 28 /* 29 * This flag indicates that the buffer should not be replayed 30 * during recovery because its blocks are being freed. 31 */ 32 #define XFS_BLF_CANCEL 0x2 33 /* 34 * This flag indicates that the buffer contains on disk 35 * user or group dquots and may require special recovery handling. 36 */ 37 #define XFS_BLF_UDQUOT_BUF 0x4 38 #define XFS_BLF_PDQUOT_BUF 0x8 39 #define XFS_BLF_GDQUOT_BUF 0x10 40 41 #define XFS_BLF_CHUNK 128 42 #define XFS_BLF_SHIFT 7 43 #define BIT_TO_WORD_SHIFT 5 44 #define NBWORD (NBBY * sizeof(unsigned int)) 45 46 /* 47 * This is the structure used to lay out a buf log item in the 48 * log. The data map describes which 128 byte chunks of the buffer 49 * have been logged. 50 */ 51 #define XFS_BLF_DATAMAP_SIZE ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD) 52 53 typedef struct xfs_buf_log_format { 54 unsigned short blf_type; /* buf log item type indicator */ 55 unsigned short blf_size; /* size of this item */ 56 ushort blf_flags; /* misc state */ 57 ushort blf_len; /* number of blocks in this buf */ 58 __int64_t blf_blkno; /* starting blkno of this buf */ 59 unsigned int blf_map_size; /* used size of data bitmap in words */ 60 unsigned int blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */ 61 } xfs_buf_log_format_t; 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 #define XFS_BLI_INODE_BUF 0x40 73 74 #define XFS_BLI_FLAGS \ 75 { XFS_BLI_HOLD, "HOLD" }, \ 76 { XFS_BLI_DIRTY, "DIRTY" }, \ 77 { XFS_BLI_STALE, "STALE" }, \ 78 { XFS_BLI_LOGGED, "LOGGED" }, \ 79 { XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \ 80 { XFS_BLI_STALE_INODE, "STALE_INODE" }, \ 81 { XFS_BLI_INODE_BUF, "INODE_BUF" } 82 83 84 #ifdef __KERNEL__ 85 86 struct xfs_buf; 87 struct xfs_mount; 88 struct xfs_buf_log_item; 89 90 /* 91 * This is the in core log item structure used to track information 92 * needed to log buffers. It tracks how many times the lock has been 93 * locked, and which 128 byte chunks of the buffer are dirty. 94 */ 95 typedef struct xfs_buf_log_item { 96 xfs_log_item_t bli_item; /* common item structure */ 97 struct xfs_buf *bli_buf; /* real buffer pointer */ 98 unsigned int bli_flags; /* misc flags */ 99 unsigned int bli_recur; /* lock recursion count */ 100 atomic_t bli_refcount; /* cnt of tp refs */ 101 #ifdef XFS_TRANS_DEBUG 102 char *bli_orig; /* original buffer copy */ 103 char *bli_logged; /* bytes logged (bitmap) */ 104 #endif 105 int bli_format_count; /* count of headers */ 106 struct xfs_buf_log_format *bli_formats; /* array of in-log header ptrs */ 107 struct xfs_buf_log_format bli_format; /* embedded in-log header */ 108 } xfs_buf_log_item_t; 109 110 void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *); 111 void xfs_buf_item_relse(struct xfs_buf *); 112 void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint); 113 uint xfs_buf_item_dirty(xfs_buf_log_item_t *); 114 void xfs_buf_attach_iodone(struct xfs_buf *, 115 void(*)(struct xfs_buf *, xfs_log_item_t *), 116 xfs_log_item_t *); 117 void xfs_buf_iodone_callbacks(struct xfs_buf *); 118 void xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *); 119 120 #ifdef XFS_TRANS_DEBUG 121 void 122 xfs_buf_item_flush_log_debug( 123 struct xfs_buf *bp, 124 uint first, 125 uint last); 126 #else 127 #define xfs_buf_item_flush_log_debug(bp, first, last) 128 #endif 129 130 #endif /* __KERNEL__ */ 131 132 #endif /* __XFS_BUF_ITEM_H__ */ 133