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 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html