[LTP] [PATCH v5 2/3] ioctl_loop01.c: Add new support .needs_cmds

[Petr Vorel]

Hi Wei,

Reviewed-by: Petr Vorel <pvorel@suse.cz>

> +++ b/testcases/kernel/syscalls/ioctl/ioctl_loop01.c
> @@ -78,23 +78,6 @@ static void check_loop_value(int set_flag, int get_flag, int autoclear_field)

>  static void verify_ioctl_loop(void)
>  {
> -	int ret;
> -	const char *const cmd_parted[] = {"parted", "-s", dev_path, "mklabel", "msdos", "mkpart",
> -					"primary", "ext4", "1M", "10M", NULL};
> -
> -	tst_fill_file("test.img", 0, 1024 * 1024, 10);
> -	tst_attach_device(dev_path, "test.img");
> -
> -	ret = tst_cmd(cmd_parted, NULL, NULL, TST_CMD_PASS_RETVAL);
> -	if (!ret)
> -		parted_sup = 1;
> -	else if (ret == 255)
> -		tst_res(TCONF, "parted binary not installed or failed");
> -	else
> -		tst_res(TCONF, "parted exited with %i", ret);
> -
> -	attach_flag = 1;
> -
>  	TST_ASSERT_INT(partscan_path, 0);
>  	TST_ASSERT_INT(autoclear_path, 0);
>  	TST_ASSERT_STR(backing_path, backing_file_path);
> @@ -113,10 +96,23 @@ static void verify_ioctl_loop(void)

>  static void setup(void)
>  {
> +	parted_sup = tst_cmd_present("parted");
> +
> +	const char *const cmd_parted[] = {"parted", "-s", dev_path, "mklabel", "msdos", "mkpart",
> +	                                  "primary", "ext4", "1M", "10M", NULL};

FYI unfortunately I'm still able to trigger loop failure on SLES 5.14 based kernel
when looping ioctl_loop01 and ioctl_ficlone02 for a while on both current master
and with this patch (which does not handle the problem).

dmesg:
[ 1101.501003] ioctl_loop01
[ 1101.519346] loop0: detected capacity change from 0 to 20480
[ 1101.664879] loop_reread_partitions: partition scan of loop0 () failed (rc=-16)
[ 1101.705931] blk_update_request: I/O error, dev loop0, sector 20352 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[ 1101.710398] blk_update_request: I/O error, dev loop0, sector 20352 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[ 1101.710423] __loop_clr_fd: partition scan of loop0 failed (rc=-16)
[ 1101.713612] Buffer I/O error on dev loop0p1, logical block 2288, async page read
[ 1101.774843] blk_update_request: I/O error, dev loop0, sector 20352 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[ 1101.783014] blk_update_request: I/O error, dev loop0, sector 20352 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[ 1101.787585] Buffer I/O error on dev loop0p1, logical block 2288, async page read
[ 1101.824974] ioctl_ficlone02
[ 1101.827315] loop0: detected capacity change from 0 to 614400
[ 1101.861851] /dev/zero: Can't open blockdev
[ 1101.968916] EXT4-fs (loop0): mounting ext2 file system using the ext4 subsystem
[ 1101.975954] EXT4-fs (loop0): mounted filesystem without journal. Opts: (null). Quota mode: none.
[ 1102.156957] EXT4-fs (loop0): mounting ext3 file system using the ext4 subsystem
[ 1102.163452] EXT4-fs (loop0): mounted filesystem with ordered data mode. Opts: (null). Quota mode: none.
[ 1102.268502] EXT4-fs (loop0): mounted filesystem with ordered data mode. Opts: (null). Quota mode: none.

Fortunately Martin is working on a patch for LTP library that'll check for
leftover partitions after loop device release and clear them, with appropriate
TWARN message.

Kind regards,
Petr

> +
>  	dev_num = tst_find_free_loopdev(dev_path, sizeof(dev_path));
>  	if (dev_num < 0)
>  		tst_brk(TBROK, "Failed to find free loop device");

> +	tst_fill_file("test.img", 0, 1024 * 1024, 10);
> +
> +	tst_attach_device(dev_path, "test.img");
> +	attach_flag = 1;
> +
> +	if (parted_sup)
> +		SAFE_CMD(cmd_parted, NULL, NULL);
> +
>  	sprintf(partscan_path, "/sys/block/loop%d/loop/partscan", dev_num);
>  	sprintf(autoclear_path, "/sys/block/loop%d/loop/autoclear", dev_num);
>  	sprintf(backing_path, "/sys/block/loop%d/loop/backing_file", dev_num);
> @@ -148,5 +144,9 @@ static struct tst_test test = {
>  		{"linux-git", "6ac92fb5cdff"},
>  		{}
>  	},
> +	.needs_cmds = (struct tst_cmd[]) {
> +		{.cmd = "parted", .optional = 1},
> +		{}
> +	},