| 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_BLF_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_BLF_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_BLF_UDQUOT_BUF 0x4 |
| 55 | #define XFS_BLF_PDQUOT_BUF 0x8 |
| 56 | #define XFS_BLF_GDQUOT_BUF 0x10 |
| 57 | |
| 58 | #define XFS_BLF_CHUNK 128 |
| 59 | #define XFS_BLF_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 | #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 | xfs_buf_log_format_t bli_format; /* in-log header */ |
| 106 | } xfs_buf_log_item_t; |
| 107 | |
| 108 | void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *); |
| 109 | void xfs_buf_item_relse(struct xfs_buf *); |
| 110 | void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint); |
| 111 | uint xfs_buf_item_dirty(xfs_buf_log_item_t *); |
| 112 | void xfs_buf_attach_iodone(struct xfs_buf *, |
| 113 | void(*)(struct xfs_buf *, xfs_log_item_t *), |
| 114 | xfs_log_item_t *); |
| 115 | void xfs_buf_iodone_callbacks(struct xfs_buf *); |
| 116 | void xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *); |
| 117 | |
| 118 | #ifdef XFS_TRANS_DEBUG |
| 119 | void |
| 120 | xfs_buf_item_flush_log_debug( |
| 121 | struct xfs_buf *bp, |
| 122 | uint first, |
| 123 | uint last); |
| 124 | #else |
| 125 | #define xfs_buf_item_flush_log_debug(bp, first, last) |
| 126 | #endif |
| 127 | |
| 128 | #endif /* __KERNEL__ */ |
| 129 | |
| 130 | #endif /* __XFS_BUF_ITEM_H__ */ |