LXR linux/fs/ocfs2/buffer_head

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