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    Subject[PATCH 1/5] Wrapper for lower-level revalidate_disk routines.
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    Wrapper for lower-level revalidate_disk routines.

    This is a wrapper for the lower-level revalidate_disk call-backs such
    as sd_revalidate_disk(). It allows us to perform pre and post
    operations when calling them.

    We will use this wrapper in a later patch to adjust block device sizes
    after an online resize (a _post_ operation).

    Signed-off-by: Andrew Patterson <andrew.patterson@hp.com>
    ---

    fs/block_dev.c | 21 +++++++++++++++++++++
    include/linux/fs.h | 1 +
    2 files changed, 22 insertions(+), 0 deletions(-)


    diff --git a/fs/block_dev.c b/fs/block_dev.c
    index 7d822fa..72aaf59 100644
    --- a/fs/block_dev.c
    +++ b/fs/block_dev.c
    @@ -867,6 +867,27 @@ struct block_device *open_by_devnum(dev_t dev, unsigned mode)

    EXPORT_SYMBOL(open_by_devnum);

    +/**
    + * revalidate_disk - wrapper for lower-level driver's revalidate_disk
    + * call-back
    + *
    + * @disk: struct gendisk to be revalidated
    + *
    + * This routine is a wrapper for lower-level driver's revalidate_disk
    + * call-backs. It is used to do common pre and post operations needed
    + * for all revalidate_disk operations.
    + */
    +int revalidate_disk(struct gendisk *disk)
    +{
    + int ret = 0;
    +
    + if (disk->fops->revalidate_disk)
    + ret = disk->fops->revalidate_disk(disk);
    +
    + return ret;
    +}
    +EXPORT_SYMBOL(revalidate_disk);
    +
    /*
    * This routine checks whether a removable media has been changed,
    * and invalidates all buffer-cache-entries in that case. This
    diff --git a/include/linux/fs.h b/include/linux/fs.h
    index a1ba005..bdc396c 100644
    --- a/include/linux/fs.h
    +++ b/include/linux/fs.h
    @@ -1709,6 +1709,7 @@ extern int fs_may_remount_ro(struct super_block *);
    */
    #define bio_data_dir(bio) ((bio)->bi_rw & 1)

    +extern int revalidate_disk(struct gendisk *);
    extern int check_disk_change(struct block_device *);
    extern int __invalidate_device(struct block_device *);
    extern int invalidate_partition(struct gendisk *, int);


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