On Wed, Feb 15, 2012 at 2:08 PM, Manish Katiyar [off-list ref] wrote:

[Apparently I forgot to cc list]

On Tue, Feb 14, 2012 at 10:04 PM, Manish Katiyar [off-list ref]
wrote:

quoted

On Tue, Feb 14, 2012 at 7:43 PM, Ravishankar [off-list ref]

wrote:

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Hello,

When we unmount a file system with the umount command or the umount()

system

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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

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do_umount() call in fs/namespace.c, I could not find calls to sync any

dirty

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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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