That was a very nice explanation Greg, i had the concept that
we only suspend write requests during freeze. Thanks for clearing my doubt.
Rishi if you can state the purpose, why you want to freeze the file
system would be
more helpful.
On Thu, Jan 1, 2009 at 4:34 AM, Mark Brown wrote:
> That is m
That is most likely due to the filesystem cache. Try running iostat
and checking the block device statistics for the device you froze!
-- Mark
On Dec 31, 2008, at 9:39 AM, rishi agrawal wrote:
I used a kernel module to freeze the file system using the function
freeze_bdev
but when i am try
Rohit, that might cause unintentional consequences: e.g. causing the
vfs to fail any write requests to a filesystem with an error. On the
other hand, a filesystem freeze will block any I/Os from being written
to disk and keep the filesystem state consistent. I think
freeze_bdev() is the bes
Do you understand the purpose of the freeze?
It is to ensure the underlying block device is stable and consistent.
I believe the primary in kernel user of freeze is device mapper (DM).
DM effectively does:
freeze
create COW based snapshot
unfreeze.
Creation of a COW (copy on write) snapshot is
On Thu, Jan 1, 2009 at 2:04 AM, Rohit Sharma wrote:
> May be remounting the file system in read only mode will help.
>
> try this:
> # mount -o remount,ro
>
Yes this works, after remounting the file system in read only mode you
cant create new files and
you cant even write anything. I hope that h
May be remounting the file system in read only mode will help.
try this:
# mount -o remount,ro
On Wed, Dec 31, 2008 at 8:36 PM, rishi agrawal wrote:
> as far as i have understood it is not freezing the file system but it
> is only freezing the write operation on block device
>
> had it been fr
as far as i have understood it is not freezing the file system but it
is only freezing the write operation on block device
had it been freezing the file system inode creation would also block
On Wed, Dec 31, 2008 at 8:09 PM, rishi agrawal wrote:
> I used a kernel module to freeze the file syst
I used a kernel module to freeze the file system using the function freeze_bdev
but when i am try to use touch command on the file system i am able to
create the files.
even read requests are served immediately
only the write requests are being blocked
until i call the thaw function
can i have
Hello,
I want to freeze a file system. I have seen a field in vfs superblock
> s_frozen.
>
> But i am clue less about freezing the file system using that.
>
freeze_bdev function ( fs/buffer.c) lock a filesystem and force it into a
consistent state ...
Above function use s_frozen flag to freez th
Hello everyone,
I want to freeze a file system. I have seen a field in vfs superblock s_frozen.
But i am clue less about freezing the file system using that.
--
Regards,
Rishi B. Agrawal
--
To unsubscribe from this list: send an email with
"unsubscribe kernelnewbies" to ecar...@nl.linux.org
10 matches
Mail list logo
