[Bug 76261] ext4_da_writepages err -30 after remount ro during shutdown

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=76261

--- Comment #11 from Theodore Tso <tytso@mit.edu> ---
Hi Ken, commit 807612db2f9940 is not going to help you, since
emergency_remount() is calling do_remount_sb with force == 0.

Note that if applications are still writing to the file system at the time of
the shutdown, the application files are at risk of getting corrupted.   It
doesn't actually really matter if sb_prepare_readonly_remount() causes those
writes to return EROFS as opposed to returning success and then having the
writes fail.  It might quiet the the error messages in the system log, but it's
not going to allow the applications to shutdown cleanly --- because if this
patch was going to make a difference, it implies that applications are not
getting shut down cleanly before android triggers the emergency_remount.

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