Does unmount() sync dirty buffers

[Manish Katiyar]

[Apparently I forgot to cc list]

On Tue, Feb 14, 2012 at 10:04 PM, Manish Katiyar <mkatiyar at gmail.com> wrote:
> On Tue, Feb 14, 2012 at 7:43 PM, Ravishankar <cyberax82 at gmail.com> wrote:
>> Hello,
>>
>> When we unmount a file system with the umount command or the umount() system
>> call, does the kernel sync the dirty buffers before the file system is
>> unmounted?I am assuming that the file system is not 'busy' (i.e no open
>> files etc) and no force options are specified. When I did a walk-through of
>> do_umount() call in fs/namespace.c, I could not find calls to sync any dirty
>> pages that might exist.
>
> yes, most of the filesystem have their own function to sync fs. Look
> for the function pointer "sync_fs"
>
> For eg..for ext4
>
> generic_shutdown_super -> sync_filesystem -> __sync_filesystem ->
> sync_fs -> ext4_sync_fs
> --
> Thanks -
> Manish



-- 
Thanks -
Manish