src/patches/suse-2.6.27.39/patches.drivers/bdev-resize-wrapper-for-revalidate_disk

   1 Subject: Wrapper for lower-level revalidate_disk routines.
   2 From: Andrew Patterson <andrew.patterson@hp.com>
   3 Date: Thu Oct 9 08:56:12 2008 +0200:
   4 Git: 0c002c2f74e10baa9021d3ecc50585c6eafea568
   5 References: FATE#302348,FATE#303786
   6
   7 This is a wrapper for the lower-level revalidate_disk call-backs such
   8 as sd_revalidate_disk(). It allows us to perform pre and post
   9 operations when calling them.
  10
  11 We will use this wrapper in a later patch to adjust block device sizes
  12 after an online resize (a _post_ operation).
  13
  14 Signed-off-by: Andrew Patterson <andrew.patterson@hp.com>
  15 Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
  16 Signed-off-by: Hannes Reinecke <hare@suse.de>
  17 ---
  18  fs/block_dev.c     |   21 +++++++++++++++++++++
  19  include/linux/fs.h |    1 +
  20  2 files changed, 22 insertions(+)
  21
  22 --- a/fs/block_dev.c
  23 +++ b/fs/block_dev.c
  24 @@ -868,6 +868,27 @@ struct block_device *open_by_devnum(dev_
  25
  26  EXPORT_SYMBOL(open_by_devnum);
  27
  28 +/**
  29 + * revalidate_disk - wrapper for lower-level driver's revalidate_disk
  30 + *                   call-back
  31 + *
  32 + * @disk: struct gendisk to be revalidated
  33 + *
  34 + * This routine is a wrapper for lower-level driver's revalidate_disk
  35 + * call-backs.  It is used to do common pre and post operations needed
  36 + * for all revalidate_disk operations.
  37 + */
  38 +int revalidate_disk(struct gendisk *disk)
  39 +{
  40 +       int ret = 0;
  41 +
  42 +       if (disk->fops->revalidate_disk)
  43 +               ret = disk->fops->revalidate_disk(disk);
  44 +
  45 +       return ret;
  46 +}
  47 +EXPORT_SYMBOL(revalidate_disk);
  48 +
  49  /*
  50   * This routine checks whether a removable media has been changed,
  51   * and invalidates all buffer-cache-entries in that case. This
  52 --- a/include/linux/fs.h
  53 +++ b/include/linux/fs.h
  54 @@ -1742,6 +1742,7 @@ extern int fs_may_remount_ro(struct supe
  55   */
  56  #define bio_data_dir(bio)      ((bio)->bi_rw & 1)
  57
  58 +extern int revalidate_disk(struct gendisk *);
  59  extern int check_disk_change(struct block_device *);
  60  extern int __invalidate_device(struct block_device *);
  61  extern int invalidate_partition(struct gendisk *, int);