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/* * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. * All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __XFS_BUF_ITEM_H__ #define __XFS_BUF_ITEM_H__ /* * This is the structure used to lay out a buf log item in the * log. The data map describes which 128 byte chunks of the buffer * have been logged. This structure works only on buffers that * reside up to the first TB in the filesystem. These buffers are * generated only by pre-6.2 systems and are known as XFS_LI_6_1_BUF. */ typedef struct xfs_buf_log_format_v1 { unsigned short blf_type; /* buf log item type indicator */ unsigned short blf_size; /* size of this item */ __int32_t blf_blkno; /* starting blkno of this buf */ ushort blf_flags; /* misc state */ ushort blf_len; /* number of blocks in this buf */ unsigned int blf_map_size; /* size of data bitmap in words */ unsigned int blf_data_map[1];/* variable size bitmap of */ /* regions of buffer in this item */ } xfs_buf_log_format_v1_t; /* * This is a form of the above structure with a 64 bit blkno field. * For 6.2 and beyond, this is XFS_LI_BUF. We use this to log everything. */ typedef struct xfs_buf_log_format_t { unsigned short blf_type; /* buf log item type indicator */ unsigned short blf_size; /* size of this item */ ushort blf_flags; /* misc state */ ushort blf_len; /* number of blocks in this buf */ __int64_t blf_blkno; /* starting blkno of this buf */ unsigned int blf_map_size; /* size of data bitmap in words */ unsigned int blf_data_map[1];/* variable size bitmap of */ /* regions of buffer in this item */ } xfs_buf_log_format_t; /* * This flag indicates that the buffer contains on disk inodes * and requires special recovery handling. */ #define XFS_BLI_INODE_BUF 0x1 /* * This flag indicates that the buffer should not be replayed * during recovery because its blocks are being freed. */ #define XFS_BLI_CANCEL 0x2 /* * This flag indicates that the buffer contains on disk * user or group dquots and may require special recovery handling. */ #define XFS_BLI_UDQUOT_BUF 0x4 #define XFS_BLI_PDQUOT_BUF 0x8 #define XFS_BLI_GDQUOT_BUF 0x10 #define XFS_BLI_CHUNK 128 #define XFS_BLI_SHIFT 7 #define BIT_TO_WORD_SHIFT 5 #define NBWORD (NBBY * sizeof(unsigned int)) /* * buf log item flags */ #define XFS_BLI_HOLD 0x01 #define XFS_BLI_DIRTY 0x02 #define XFS_BLI_STALE 0x04 #define XFS_BLI_LOGGED 0x08 #define XFS_BLI_INODE_ALLOC_BUF 0x10 #define XFS_BLI_STALE_INODE 0x20 #ifdef __KERNEL__ struct xfs_buf; struct ktrace; struct xfs_mount; struct xfs_buf_log_item; #if defined(XFS_BLI_TRACE) #define XFS_BLI_TRACE_SIZE 32 void xfs_buf_item_trace(char *, struct xfs_buf_log_item *); #else #define xfs_buf_item_trace(id, bip) #endif /* * This is the in core log item structure used to track information * needed to log buffers. It tracks how many times the lock has been * locked, and which 128 byte chunks of the buffer are dirty. */ typedef struct xfs_buf_log_item { xfs_log_item_t bli_item; /* common item structure */ struct xfs_buf *bli_buf; /* real buffer pointer */ unsigned int bli_flags; /* misc flags */ unsigned int bli_recur; /* lock recursion count */ atomic_t bli_refcount; /* cnt of tp refs */ #ifdef XFS_BLI_TRACE struct ktrace *bli_trace; /* event trace buf */ #endif #ifdef XFS_TRANS_DEBUG char *bli_orig; /* original buffer copy */ char *bli_logged; /* bytes logged (bitmap) */ #endif xfs_buf_log_format_t bli_format; /* in-log header */ } xfs_buf_log_item_t; /* * This structure is used during recovery to record the buf log * items which have been canceled and should not be replayed. */ typedef struct xfs_buf_cancel { xfs_daddr_t bc_blkno; uint bc_len; int bc_refcount; struct xfs_buf_cancel *bc_next; } xfs_buf_cancel_t; void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *); void xfs_buf_item_relse(struct xfs_buf *); void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint); uint xfs_buf_item_dirty(xfs_buf_log_item_t *); void xfs_buf_attach_iodone(struct xfs_buf *, void(*)(struct xfs_buf *, xfs_log_item_t *), xfs_log_item_t *); void xfs_buf_iodone_callbacks(struct xfs_buf *); void xfs_buf_iodone(struct xfs_buf *, xfs_buf_log_item_t *); #ifdef XFS_TRANS_DEBUG void xfs_buf_item_flush_log_debug( struct xfs_buf *bp, uint first, uint last); #else #define xfs_buf_item_flush_log_debug(bp, first, last) #endif #endif /* __KERNEL__ */ #endif /* __XFS_BUF_ITEM_H__ */