Users can pass in an arbitrary source path for the proper type of
a mount then without "Can't lookup blockdev" error message.

Reported-by: Allison Karlitskaya <allison.karlitsk...@redhat.com>
Closes: 
https://lore.kernel.org/r/CAOYeF9VQ8jKVmpy5Zy9DNhO6xmWSKMB-DO8yvBB0XvBE7=3...@mail.gmail.com
Signed-off-by: Gao Xiang <hsiang...@linux.alibaba.com>
---
changes since v1:
 - use new get_tree_bdev_flags().

 fs/erofs/super.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 666873f745da..b89836a8760d 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -705,7 +705,9 @@ static int erofs_fc_get_tree(struct fs_context *fc)
        if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && sbi->fsid)
                return get_tree_nodev(fc, erofs_fc_fill_super);
 
-       ret = get_tree_bdev(fc, erofs_fc_fill_super);
+       ret = get_tree_bdev_flags(fc, erofs_fc_fill_super,
+               IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE) ?
+                       GET_TREE_BDEV_QUIET_LOOKUP : 0);
 #ifdef CONFIG_EROFS_FS_BACKED_BY_FILE
        if (ret == -ENOTBLK) {
                if (!fc->source)
-- 
2.43.5

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