ext2: clear uptodate flag on super block I/O error
This fixes a WARN backtrace in mark_buffer_dirty() that occurs during unmount when a USB or floppy device is removed. I reported this a kernel regression, but looks like it might have been there for longer than that. The super block update from a previous operation has marked the buffer as in error, and the flag has to be cleared before doing the update. (Similar code already exists in ext4). Signed-off-by: NStephen Hemminger <shemminger@vyatta.com> Signed-off-by: NJan Kara <jack@suse.cz>
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