From mboxrd@z Thu Jan  1 00:00:00 1970
From: Cyril Hrubis <chrubis@suse.cz>
Date: Fri, 12 Mar 2021 11:56:49 +0100
Subject: [LTP] [PATCH] lib/tst_device.c: Add exception handling of
 function tst_find_free_loopdev
In-Reply-To: <F3D3F6AC3820BB4C9FCA340DB5C32CB403891318@dggeml511-mbs.china.huawei.com>
References: <F3D3F6AC3820BB4C9FCA340DB5C32CB403891318@dggeml511-mbs.china.huawei.com>
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To: ltp@lists.linux.it

Hi!
> > In addition, when "loopdevno = ioctl(fd, LOOP_CTL_GET_FREE)" get free
> > loop device i, and the loop device file /dev/loop%i has been removed??
> > set_dev_path will return 1 and set " /dev/block/loop%i "
> > in path. It might happened in many Embedded Systems because the test
> > process's id is root always. So we could also Add exception handling?
> 
> Or maybe we can try to create it when node doesn't exist?
> 	mknod("/dev/loop%i", S_IFBLK|0644, makedev(7, i))

I do not really get what happens on your system. It looks like dev fs is
not properly populated, which would be bug in your system rather than in
the test library.

What is the state of /dev/loop* and /dev/block/loop* before you attempt
to run the test?

-- 
Cyril Hrubis
chrubis@suse.cz