diff options
Diffstat (limited to 'fs/ocfs2/buffer_head_io.h')
-rw-r--r-- | fs/ocfs2/buffer_head_io.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/fs/ocfs2/buffer_head_io.h b/fs/ocfs2/buffer_head_io.h new file mode 100644 index 0000000000..2d51649fc0 --- /dev/null +++ b/fs/ocfs2/buffer_head_io.h @@ -0,0 +1,58 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * ocfs2_buffer_head.h + * + * Buffer cache handling functions defined + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + */ + +#ifndef OCFS2_BUFFER_HEAD_IO_H +#define OCFS2_BUFFER_HEAD_IO_H + +#include <linux/buffer_head.h> + +int ocfs2_write_block(struct ocfs2_super *osb, + struct buffer_head *bh, + struct ocfs2_caching_info *ci); +int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block, + unsigned int nr, struct buffer_head *bhs[]); + +/* + * If not NULL, validate() will be called on a buffer that is freshly + * read from disk. It will not be called if the buffer was in cache. + * Note that if validate() is being used for this buffer, it needs to + * be set even for a READAHEAD call, as it marks the buffer for later + * validation. + */ +int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr, + struct buffer_head *bhs[], int flags, + int (*validate)(struct super_block *sb, + struct buffer_head *bh)); + +int ocfs2_write_super_or_backup(struct ocfs2_super *osb, + struct buffer_head *bh); + +#define OCFS2_BH_IGNORE_CACHE 1 +#define OCFS2_BH_READAHEAD 8 + +static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off, + struct buffer_head **bh, + int (*validate)(struct super_block *sb, + struct buffer_head *bh)) +{ + int status = 0; + + if (bh == NULL) { + printk("ocfs2: bh == NULL\n"); + status = -EINVAL; + goto bail; + } + + status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate); + +bail: + return status; +} + +#endif /* OCFS2_BUFFER_HEAD_IO_H */ |