1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* -*- mode: c; c-basic-offset: 8; -*- 3 * vim: noexpandtab sw=8 ts=8 sts=0: 4 * 5 * ocfs2_buffer_head.h 6 * 7 * Buffer cache handling functions defined 8 * 9 * Copyright (C) 2002, 2004 Oracle. All rights reserved. 10 */ 11 12 #ifndef OCFS2_BUFFER_HEAD_IO_H 13 #define OCFS2_BUFFER_HEAD_IO_H 14 15 #include <linux/buffer_head.h> 16 17 int ocfs2_write_block(struct ocfs2_super *osb, 18 struct buffer_head *bh, 19 struct ocfs2_caching_info *ci); 20 int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block, 21 unsigned int nr, struct buffer_head *bhs[]); 22 23 /* 24 * If not NULL, validate() will be called on a buffer that is freshly 25 * read from disk. It will not be called if the buffer was in cache. 26 * Note that if validate() is being used for this buffer, it needs to 27 * be set even for a READAHEAD call, as it marks the buffer for later 28 * validation. 29 */ 30 int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr, 31 struct buffer_head *bhs[], int flags, 32 int (*validate)(struct super_block *sb, 33 struct buffer_head *bh)); 34 35 int ocfs2_write_super_or_backup(struct ocfs2_super *osb, 36 struct buffer_head *bh); 37 38 #define OCFS2_BH_IGNORE_CACHE 1 39 #define OCFS2_BH_READAHEAD 8 40 41 static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off, 42 struct buffer_head **bh, 43 int (*validate)(struct super_block *sb, 44 struct buffer_head *bh)) 45 { 46 int status = 0; 47 48 if (bh == NULL) { 49 printk("ocfs2: bh == NULL\n"); 50 status = -EINVAL; 51 goto bail; 52 } 53 54 status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate); 55 56 bail: 57 return status; 58 } 59 60 #endif /* OCFS2_BUFFER_HEAD_IO_H */ 61