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58 lines
1.6 KiB
58 lines
1.6 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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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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#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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int ocfs2_write_block(struct ocfs2_super *osb, |
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struct buffer_head *bh, |
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struct ocfs2_caching_info *ci); |
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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 ocfs2_caching_info *ci, 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 ocfs2_caching_info *ci, 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(ci, 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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