freeze_bdev man page on Oracle

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FREEZE_BDEV(9)			 The Linux VFS			FREEZE_BDEV(9)

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
       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.
       The reference counter (bd_fsfreeze_count) guarantees that only the last
       unfreeze process can unfreeze the frozen filesystem actually when
       multiple freeze requests arrive simultaneously. It counts up in
       freeze_bdev and count down in thaw_bdev. When it becomes 0, thaw_bdev
       will unfreeze actually.

COPYRIGHT
Kernel Hackers Manual 3.8.	   June 2014			FREEZE_BDEV(9)
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