fs/ocfs2/buffer_head_io.h

   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
  15 int ocfs2_write_block(struct ocfs2_super          *osb,
  16                       struct buffer_head  *bh,
  17                       struct ocfs2_caching_info   *ci);
  18 int 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  */
  28 int 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
  33 int 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
  39 static 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
  54 bail:
  55         return status;
  56 }
  57
  58 #endif /* OCFS2_BUFFER_HEAD_IO_H */