forked from luck/tmp_suning_uos_patched
970e4936d7
Add an optional validation hook to ocfs2_read_blocks(). Now the validation function is only called when a block was actually read off of disk. It is not called when the buffer was in cache. We add a buffer state bit BH_NeedsValidate to flag these buffers. It must always be one higher than the last JBD2 buffer state bit. The dinode, dirblock, extent_block, and xattr_block validators are lifted to this scheme directly. The group_descriptor validator needs to be split into two pieces. The first part only needs the gd buffer and is passed to ocfs2_read_block(). The second part requires the dinode as well, and is called every time. It's only 3 compares, so it's tiny. This also allows us to clean up the non-fatal gd check used by resize.c. It now has no magic argument. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* ocfs2_buffer_head.h
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*
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* Buffer cache handling functions defined
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*
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* Copyright (C) 2002, 2004 Oracle. 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
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will 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 GNU
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* 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
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef OCFS2_BUFFER_HEAD_IO_H
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#define OCFS2_BUFFER_HEAD_IO_H
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#include <linux/buffer_head.h>
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void ocfs2_end_buffer_io_sync(struct buffer_head *bh,
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int uptodate);
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int ocfs2_write_block(struct ocfs2_super *osb,
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struct buffer_head *bh,
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struct inode *inode);
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int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
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unsigned int nr, struct buffer_head *bhs[]);
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/*
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* If not NULL, validate() will be called on a buffer that is freshly
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* read from disk. It will not be called if the buffer was in cache.
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* Note that if validate() is being used for this buffer, it needs to
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* be set even for a READAHEAD call, as it marks the buffer for later
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* validation.
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*/
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int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
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struct buffer_head *bhs[], int flags,
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int (*validate)(struct super_block *sb,
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struct buffer_head *bh));
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int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
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struct buffer_head *bh);
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#define OCFS2_BH_IGNORE_CACHE 1
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#define OCFS2_BH_READAHEAD 8
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static inline int ocfs2_read_block(struct inode *inode, u64 off,
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struct buffer_head **bh,
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int (*validate)(struct super_block *sb,
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struct buffer_head *bh))
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{
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int status = 0;
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if (bh == NULL) {
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printk("ocfs2: bh == NULL\n");
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status = -EINVAL;
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goto bail;
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}
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status = ocfs2_read_blocks(inode, off, 1, bh, 0, validate);
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bail:
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return status;
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}
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#endif /* OCFS2_BUFFER_HEAD_IO_H */
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