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.TH "FREEZE_BDEV" "9" "09 October 2005" "" ""

.SH NAME
freeze_bdev \- -  lock a filesystem and force it into a consistent state
.SH SYNOPSIS
"SYNOPSIS"
.sp
\fB
.sp
struct super_block * freeze_bdev  (struct block_device * \fIbdev\fB);
\fR
.SH "ARGUMENTS"
.TP
\fB\fIbdev\fB\fR
blockdevice to lock
.SH "DESCRIPTION"
.PP
This takes the block device bd_mount_sem to make sure no new mounts
happen on bdev until \fBthaw_bdev\fR 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.