On Wed, Feb 15, 2012 at 2:08 PM, Manish Katiyar <[email protected]> wrote:
> [Apparently I forgot to cc list] > > On Tue, Feb 14, 2012 at 10:04 PM, Manish Katiyar <[email protected]> > wrote: > > On Tue, Feb 14, 2012 at 7:43 PM, Ravishankar <[email protected]> > 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 > Thanks a lot.Just to add, generic_shutdown_super() is called thus: umount systemcall -->mntput_no_expire()-->__mntput()-->deactivate_super()-->deactivate_locked_super()-->kill_block_super()-->generic_shutdown_super()
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