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 */ 59