| 1 |
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| 2 | |
| 3 | * ocfs2_buffer_head.h
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| 4 | *
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| 5 | * Buffer cache handling functions defined
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| 6 | *
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| 7 | * Copyright (C) 2002, 2004 Oracle. All rights reserved.
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| 8 |
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| 9 |
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| 10 | #ifndef OCFS2_BUFFER_HEAD_IO_H
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| 11 | #define OCFS2_BUFFER_HEAD_IO_H
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| 12 |
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| 13 | #include <linux/buffer_head.h>
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| 14 |
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| 15 | int ocfs2_write_block(struct ocfs2_super *osb,
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| 16 | struct buffer_head *bh,
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| 17 | struct ocfs2_caching_info *ci);
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| 18 | int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
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| 19 | unsigned int nr, struct buffer_head *bhs[]);
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| 20 |
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| 21 | |
| 22 | * If not NULL, validate() will be called on a buffer that is freshly
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| 23 | * read from disk. It will not be called if the buffer was in cache.
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| 24 | * Note that if validate() is being used for this buffer, it needs to
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| 25 | * be set even for a READAHEAD call, as it marks the buffer for later
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| 26 | * validation.
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| 27 |
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| 28 | int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
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| 29 | struct buffer_head *bhs[], int flags,
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| 30 | int (*validate)(struct super_block *sb,
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| 31 | struct buffer_head *bh));
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| 32 |
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| 33 | int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
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| 34 | struct buffer_head *bh);
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| 35 |
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| 36 | #define OCFS2_BH_IGNORE_CACHE 1
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| 37 | #define OCFS2_BH_READAHEAD 8
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| 38 |
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| 39 | static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off,
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| 40 | struct buffer_head **bh,
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| 41 | int (*validate)(struct super_block *sb,
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| 42 | struct buffer_head *bh))
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| 43 | {
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| 44 | int status = 0;
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| 45 |
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| 46 | if (bh == NULL) {
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| 47 | printk("ocfs2: bh == NULL\n");
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| 48 | status = -EINVAL;
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| 49 | goto bail;
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| 50 | }
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| 51 |
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| 52 | status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate);
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| 53 |
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| 54 | bail:
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| 55 | return status;
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| 56 | }
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| 57 |
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| 58 | #endif
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