fs/ocfs2/buffer_head_io.h

   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 */