LXR linux/fs/ocfs2/buffer_head

   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
  17int ocfs2_write_block(struct ocfs2_super          *osb,
  18                      struct buffer_head  *bh,
  19                      struct ocfs2_caching_info   *ci);
  20int 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 */
  30int 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
  35int 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
  41static 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
  56bail:
  57        return status;
  58}
  59
  60#endif /* OCFS2_BUFFER_HEAD_IO_H */
  61