Provided by: linux-doc-2.6.15_2.6.15-23.39_all bug

NAME

       freeze_bdev - - lock a filesystem and force it into a consistent state

SYNOPSIS

       struct super_block * freeze_bdev  (struct block_device * bdev);

ARGUMENTS

       bdev   blockdevice to lock

DESCRIPTION

       This  takes  the  block  device bd_mount_sem to make sure no new mounts
       happen on bdev until thaw_bdev is called. If a superblock is  found  on
       this  device,  we take the s_umount semaphore on it to make sure nobody
       unmounts until the snapshot creation is done.