| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 2 | /* |
| 3 | * ocfs2_buffer_head.h |
| 4 | * |
| 5 | * Buffer cache handling functions defined |
| 6 | * |
| 7 | * Copyright (C) 2002, 2004 Oracle. All rights reserved. |
| 8 | */ |
| 9 | |
| 10 | #ifndef OCFS2_BUFFER_HEAD_IO_H |
| 11 | #define OCFS2_BUFFER_HEAD_IO_H |
| 12 | |
| 13 | #include <linux/buffer_head.h> |
| 14 | |
| 15 | int ocfs2_write_block(struct ocfs2_super *osb, |
| 16 | struct buffer_head *bh, |
| 17 | struct ocfs2_caching_info *ci); |
| 18 | int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block, |
| 19 | unsigned int nr, struct buffer_head *bhs[]); |
| 20 | |
| 21 | /* |
| 22 | * If not NULL, validate() will be called on a buffer that is freshly |
| 23 | * read from disk. It will not be called if the buffer was in cache. |
| 24 | * Note that if validate() is being used for this buffer, it needs to |
| 25 | * be set even for a READAHEAD call, as it marks the buffer for later |
| 26 | * validation. |
| 27 | */ |
| 28 | int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr, |
| 29 | struct buffer_head *bhs[], int flags, |
| 30 | int (*validate)(struct super_block *sb, |
| 31 | struct buffer_head *bh)); |
| 32 | |
| 33 | int ocfs2_write_super_or_backup(struct ocfs2_super *osb, |
| 34 | struct buffer_head *bh); |
| 35 | |
| 36 | #define OCFS2_BH_IGNORE_CACHE 1 |
| 37 | #define OCFS2_BH_READAHEAD 8 |
| 38 | |
| 39 | static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off, |
| 40 | struct buffer_head **bh, |
| 41 | int (*validate)(struct super_block *sb, |
| 42 | struct buffer_head *bh)) |
| 43 | { |
| 44 | int status = 0; |
| 45 | |
| 46 | if (bh == NULL) { |
| 47 | printk("ocfs2: bh == NULL\n"); |
| 48 | status = -EINVAL; |
| 49 | goto bail; |
| 50 | } |
| 51 | |
| 52 | status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate); |
| 53 | |
| 54 | bail: |
| 55 | return status; |
| 56 | } |
| 57 | |
| 58 | #endif /* OCFS2_BUFFER_HEAD_IO_H */ |