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[ Upstream commit e3645d72f8865ffe36f9dc811540d40aa3c848d3 ]
Current _ext4_show_options() do not distinguish MOPT_2 flag, so it mixed
extend sbi->s_mount_opt2 options with sbi->s_mount_opt, it could lead to
show incorrect options, e.g. show fc_debug_force if we mount with
errors=continue mode and miss it if we set.
$ mkfs.ext4 /dev/pmem0
$ mount -o errors=remount-ro /dev/pmem0 /mnt
$ cat /proc/fs/ext4/pmem0/options | grep fc_debug_force
#empty
$ mount -o remount,errors=continue /mnt
$ cat /proc/fs/ext4/pmem0/options | grep fc_debug_force
fc_debug_force
$ mount -o remount,errors=remount-ro,fc_debug_force /mnt
$ cat /proc/fs/ext4/pmem0/options | grep fc_debug_force
#empty
Fixes: 995a3ed67fc8 ("ext4: add fast_commit feature and handling for extended mount options")
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230129034939.3702550-1-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
f19d8f9368