1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * ocfs2_buffer_head.h 5 * 6 * Buffer cache handling functions defined 7 * 8 * Copyright (C) 2002, 2004 Oracle. All rights reserved. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public 12 * License as published by the Free Software Foundation; either 13 * version 2 of the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public 21 * License along with this program; if not, write to the 22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23 * Boston, MA 021110-1307, USA. 24 */ 25 26 #ifndef OCFS2_BUFFER_HEAD_IO_H 27 #define OCFS2_BUFFER_HEAD_IO_H 28 29 #include <linux/buffer_head.h> 30 31 int ocfs2_write_block(struct ocfs2_super *osb, 32 struct buffer_head *bh, 33 struct ocfs2_caching_info *ci); 34 int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block, 35 unsigned int nr, struct buffer_head *bhs[]); 36 37 /* 38 * If not NULL, validate() will be called on a buffer that is freshly 39 * read from disk. It will not be called if the buffer was in cache. 40 * Note that if validate() is being used for this buffer, it needs to 41 * be set even for a READAHEAD call, as it marks the buffer for later 42 * validation. 43 */ 44 int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr, 45 struct buffer_head *bhs[], int flags, 46 int (*validate)(struct super_block *sb, 47 struct buffer_head *bh)); 48 49 int ocfs2_write_super_or_backup(struct ocfs2_super *osb, 50 struct buffer_head *bh); 51 52 #define OCFS2_BH_IGNORE_CACHE 1 53 #define OCFS2_BH_READAHEAD 8 54 55 static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off, 56 struct buffer_head **bh, 57 int (*validate)(struct super_block *sb, 58 struct buffer_head *bh)) 59 { 60 int status = 0; 61 62 if (bh == NULL) { 63 printk("ocfs2: bh == NULL\n"); 64 status = -EINVAL; 65 goto bail; 66 } 67 68 status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate); 69 70 bail: 71 return status; 72 } 73 74 #endif /* OCFS2_BUFFER_HEAD_IO_H */ 75