77c1a08fc9
The struct xfs_buf_log_format wants to think the dirty bitmap is variable sized. In fact, it is variable size on disk simply due to the way we map it from the in-memory structure, but we still just use a fixed size memory allocation for the in-memory structure. Hence it makes no sense to set the function up as a variable sized structure when we already know it's maximum size, and we always allocate it as such. Simplify the structure by making the dirty bitmap a fixed sized array and just using the size of the structure for the allocation size. This will make it much simpler to allocate and manipulate an array of format structures for discontiguous buffer support. The previous struct xfs_buf_log_item size according to /proc/slabinfo was 224 bytes. pahole doesn't give the same size because of the variable size definition. With this modification, pahole reports the same as /proc/slabinfo: /* size: 224, cachelines: 4, members: 6 */ Because the xfs_buf_log_item size is now determined by the maximum supported block size we introduce a dependency on xfs_alloc_btree.h. Avoid this dependency by moving the idefines for the maximum block sizes supported to xfs_types.h with all the other max/min type defines to avoid any new dependencies. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ben Myers <bpm@sgi.com>
130 lines
4 KiB
C
130 lines
4 KiB
C
/*
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* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_BUF_ITEM_H__
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#define __XFS_BUF_ITEM_H__
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extern kmem_zone_t *xfs_buf_item_zone;
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/*
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* This flag indicates that the buffer contains on disk inodes
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* and requires special recovery handling.
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*/
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#define XFS_BLF_INODE_BUF 0x1
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/*
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* This flag indicates that the buffer should not be replayed
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* during recovery because its blocks are being freed.
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*/
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#define XFS_BLF_CANCEL 0x2
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/*
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* This flag indicates that the buffer contains on disk
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* user or group dquots and may require special recovery handling.
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*/
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#define XFS_BLF_UDQUOT_BUF 0x4
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#define XFS_BLF_PDQUOT_BUF 0x8
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#define XFS_BLF_GDQUOT_BUF 0x10
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#define XFS_BLF_CHUNK 128
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#define XFS_BLF_SHIFT 7
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#define BIT_TO_WORD_SHIFT 5
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#define NBWORD (NBBY * sizeof(unsigned int))
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/*
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* This is the structure used to lay out a buf log item in the
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* log. The data map describes which 128 byte chunks of the buffer
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* have been logged.
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*/
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#define XFS_BLF_DATAMAP_SIZE ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD)
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typedef struct xfs_buf_log_format {
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unsigned short blf_type; /* buf log item type indicator */
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unsigned short blf_size; /* size of this item */
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ushort blf_flags; /* misc state */
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ushort blf_len; /* number of blocks in this buf */
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__int64_t blf_blkno; /* starting blkno of this buf */
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unsigned int blf_map_size; /* used size of data bitmap in words */
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unsigned int blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */
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} xfs_buf_log_format_t;
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/*
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* buf log item flags
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*/
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#define XFS_BLI_HOLD 0x01
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#define XFS_BLI_DIRTY 0x02
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#define XFS_BLI_STALE 0x04
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#define XFS_BLI_LOGGED 0x08
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#define XFS_BLI_INODE_ALLOC_BUF 0x10
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#define XFS_BLI_STALE_INODE 0x20
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#define XFS_BLI_INODE_BUF 0x40
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#define XFS_BLI_FLAGS \
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{ XFS_BLI_HOLD, "HOLD" }, \
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{ XFS_BLI_DIRTY, "DIRTY" }, \
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{ XFS_BLI_STALE, "STALE" }, \
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{ XFS_BLI_LOGGED, "LOGGED" }, \
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{ XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \
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{ XFS_BLI_STALE_INODE, "STALE_INODE" }, \
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{ XFS_BLI_INODE_BUF, "INODE_BUF" }
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#ifdef __KERNEL__
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struct xfs_buf;
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struct xfs_mount;
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struct xfs_buf_log_item;
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/*
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* This is the in core log item structure used to track information
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* needed to log buffers. It tracks how many times the lock has been
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* locked, and which 128 byte chunks of the buffer are dirty.
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*/
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typedef struct xfs_buf_log_item {
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xfs_log_item_t bli_item; /* common item structure */
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struct xfs_buf *bli_buf; /* real buffer pointer */
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unsigned int bli_flags; /* misc flags */
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unsigned int bli_recur; /* lock recursion count */
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atomic_t bli_refcount; /* cnt of tp refs */
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#ifdef XFS_TRANS_DEBUG
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char *bli_orig; /* original buffer copy */
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char *bli_logged; /* bytes logged (bitmap) */
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#endif
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struct xfs_buf_log_format bli_format; /* embedded in-log header */
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} xfs_buf_log_item_t;
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void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
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void xfs_buf_item_relse(struct xfs_buf *);
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void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
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uint xfs_buf_item_dirty(xfs_buf_log_item_t *);
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void xfs_buf_attach_iodone(struct xfs_buf *,
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void(*)(struct xfs_buf *, xfs_log_item_t *),
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xfs_log_item_t *);
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void xfs_buf_iodone_callbacks(struct xfs_buf *);
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void xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *);
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#ifdef XFS_TRANS_DEBUG
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void
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xfs_buf_item_flush_log_debug(
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struct xfs_buf *bp,
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uint first,
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uint last);
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#else
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#define xfs_buf_item_flush_log_debug(bp, first, last)
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#endif
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#endif /* __KERNEL__ */
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#endif /* __XFS_BUF_ITEM_H__ */
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