Hello,
upon testing do_emergency_remount from a power fail interrupt (using the
workqueue of course), we noticed UBIFS is not remounted read-only afterwards.
The current code in do_emergency_remount checks if the kernel actually needs
to remount a filesystem using the following code:
> if (sb->s_root && sb->s_bdev && (sb->s_flags & MS_BORN) &&
> !(sb->s_flags & MS_RDONLY)) {
> /*
> * What lock protects sb->s_flags??
> */
> do_remount_sb(sb, MS_RDONLY, NULL, 1);
> }
I'm not in the details of this part of the kernel, but I suspect that sb-
>s_bdev is NULL for UBIFS as it has no block device, but the character device
/dev/ubiX_Y instead. I have the information from a collegue that removing the
check for testing purposes for sb->s_bdev mounts UBIFS read-only.
Any comments/ideas how to remount UBIFS as read-only from
do_emergency_remount?
Best regards,
Alexander
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