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 (1<<0) 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 (1<<1) 33 34 /* 35 * This flag indicates that the buffer contains on disk 36 * user or group dquots and may require special recovery handling. 37 */ 38 #define XFS_BLF_UDQUOT_BUF (1<<2) 39 #define XFS_BLF_PDQUOT_BUF (1<<3) 40 #define XFS_BLF_GDQUOT_BUF (1<<4) 41 42 /* 43 * all buffers now need flags to tell recovery where the magic number 44 * is so that it can verify and calculate the CRCs on the buffer correctly 45 * once the changes have been replayed into the buffer. 46 */ 47 #define XFS_BLF_BTREE_BUF (1<<5) 48 49 #define XFS_BLF_TYPE_MASK \ 50 (XFS_BLF_UDQUOT_BUF | \ 51 XFS_BLF_PDQUOT_BUF | \ 52 XFS_BLF_GDQUOT_BUF | \ 53 XFS_BLF_BTREE_BUF) 54 55 #define XFS_BLF_CHUNK 128 56 #define XFS_BLF_SHIFT 7 57 #define BIT_TO_WORD_SHIFT 5 58 #define NBWORD (NBBY * sizeof(unsigned int)) 59 60 /* 61 * This is the structure used to lay out a buf log item in the 62 * log. The data map describes which 128 byte chunks of the buffer 63 * have been logged. 64 */ 65 #define XFS_BLF_DATAMAP_SIZE ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD) 66 67 typedef struct xfs_buf_log_format { 68 unsigned short blf_type; /* buf log item type indicator */ 69 unsigned short blf_size; /* size of this item */ 70 ushort blf_flags; /* misc state */ 71 ushort blf_len; /* number of blocks in this buf */ 72 __int64_t blf_blkno; /* starting blkno of this buf */ 73 unsigned int blf_map_size; /* used size of data bitmap in words */ 74 unsigned int blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */ 75 } xfs_buf_log_format_t; 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 #define XFS_BLI_INODE_BUF 0x40 87 88 #define XFS_BLI_FLAGS \ 89 { XFS_BLI_HOLD, "HOLD" }, \ 90 { XFS_BLI_DIRTY, "DIRTY" }, \ 91 { XFS_BLI_STALE, "STALE" }, \ 92 { XFS_BLI_LOGGED, "LOGGED" }, \ 93 { XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \ 94 { XFS_BLI_STALE_INODE, "STALE_INODE" }, \ 95 { XFS_BLI_INODE_BUF, "INODE_BUF" } 96 97 98 #ifdef __KERNEL__ 99 100 struct xfs_buf; 101 struct xfs_mount; 102 struct xfs_buf_log_item; 103 104 /* 105 * This is the in core log item structure used to track information 106 * needed to log buffers. It tracks how many times the lock has been 107 * locked, and which 128 byte chunks of the buffer are dirty. 108 */ 109 typedef struct xfs_buf_log_item { 110 xfs_log_item_t bli_item; /* common item structure */ 111 struct xfs_buf *bli_buf; /* real buffer pointer */ 112 unsigned int bli_flags; /* misc flags */ 113 unsigned int bli_recur; /* lock recursion count */ 114 atomic_t bli_refcount; /* cnt of tp refs */ 115 int bli_format_count; /* count of headers */ 116 struct xfs_buf_log_format *bli_formats; /* array of in-log header ptrs */ 117 struct xfs_buf_log_format __bli_format; /* embedded in-log header */ 118 } xfs_buf_log_item_t; 119 120 void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *); 121 void xfs_buf_item_relse(struct xfs_buf *); 122 void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint); 123 uint xfs_buf_item_dirty(xfs_buf_log_item_t *); 124 void xfs_buf_attach_iodone(struct xfs_buf *, 125 void(*)(struct xfs_buf *, xfs_log_item_t *), 126 xfs_log_item_t *); 127 void xfs_buf_iodone_callbacks(struct xfs_buf *); 128 void xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *); 129 130 #endif /* __KERNEL__ */ 131 132 #endif /* __XFS_BUF_ITEM_H__ */ 133