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| 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 | void ocfs2_end_buffer_io_sync(struct buffer_head *bh, |
| 32 | int uptodate); |
| 33 | |
| 34 | int ocfs2_write_block(struct ocfs2_super *osb, |
| 35 | struct buffer_head *bh, |
| 36 | struct ocfs2_caching_info *ci); |
| 37 | int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block, |
| 38 | unsigned int nr, struct buffer_head *bhs[]); |
| 39 | |
| 40 | /* |
| 41 | * If not NULL, validate() will be called on a buffer that is freshly |
| 42 | * read from disk. It will not be called if the buffer was in cache. |
| 43 | * Note that if validate() is being used for this buffer, it needs to |
| 44 | * be set even for a READAHEAD call, as it marks the buffer for later |
| 45 | * validation. |
| 46 | */ |
| 47 | int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr, |
| 48 | struct buffer_head *bhs[], int flags, |
| 49 | int (*validate)(struct super_block *sb, |
| 50 | struct buffer_head *bh)); |
| 51 | |
| 52 | int ocfs2_write_super_or_backup(struct ocfs2_super *osb, |
| 53 | struct buffer_head *bh); |
| 54 | |
| 55 | #define OCFS2_BH_IGNORE_CACHE 1 |
| 56 | #define OCFS2_BH_READAHEAD 8 |
| 57 | |
| 58 | static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off, |
| 59 | struct buffer_head **bh, |
| 60 | int (*validate)(struct super_block *sb, |
| 61 | struct buffer_head *bh)) |
| 62 | { |
| 63 | int status = 0; |
| 64 | |
| 65 | if (bh == NULL) { |
| 66 | printk("ocfs2: bh == NULL\n"); |
| 67 | status = -EINVAL; |
| 68 | goto bail; |
| 69 | } |
| 70 | |
| 71 | status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate); |
| 72 | |
| 73 | bail: |
| 74 | return status; |
| 75 | } |
| 76 | |
| 77 | #endif /* OCFS2_BUFFER_HEAD_IO_H */ |
| 78 |
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Tags:
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od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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