[LTP] [PATCH v6 2/3] syscalls/quotactl07: Refactor this case

[xuyang2018.jy@fujitsu.com]

Hi Cyril
> Hi!
>> diff --git a/testcases/kernel/syscalls/quotactl/quotactl07.c b/testcases/kernel/syscalls/quotactl/quotactl07.c
>> index 2992a6112..2427ef682 100644
>> --- a/testcases/kernel/syscalls/quotactl/quotactl07.c
>> +++ b/testcases/kernel/syscalls/quotactl/quotactl07.c
>> @@ -7,7 +7,9 @@
>>   /*\
>>    * [Description]
>>    *
>> - * This is a regresstion test for kernel commit 3dd4d40b4208
>> + * This is not only a functional test but also a error test for Q_XQUOTARM.
>> + *
>> + * It is a regresstion test for kernel commit 3dd4d40b4208
>>    * ("xfs: Sanity check flags of Q_XQUOTARM call").
>>    */
>>
>> @@ -15,51 +17,71 @@
>>   #include<unistd.h>
>>   #include<stdio.h>
>>   #include<sys/quota.h>
>> +#include<sys/statvfs.h>
>>   #include "tst_test.h"
>> -#include "lapi/quotactl.h"
>> +#include "quotactl_syscall_var.h"
>>
>>   #ifdef HAVE_XFS_XQM_H
>>   # include<xfs/xqm.h>
>>
>> -#define MNTPOINT    "mntpoint"
>> -
>> -static uint32_t qflag_acct = XFS_QUOTA_UDQ_ACCT;
>> -static unsigned int valid_type = XFS_USER_QUOTA;
>>   /* Include a valid quota type to avoid other EINVAL error */
>>   static unsigned int invalid_type = XFS_GROUP_QUOTA<<  1 | XFS_USER_QUOTA;
>> +static unsigned int valid_type = XFS_USER_QUOTA;
>> +static int mount_flag;
>>
>>   static void verify_quota(void)
>>   {
>> -	TEST(quotactl(QCMD(Q_XQUOTARM, USRQUOTA), tst_device->dev, 0, (void *)&invalid_type));
>> -	if (TST_ERR == EINVAL)
>> -		tst_res(TPASS, "Q_XQUOTARM has quota type check");
>> +	struct statfs before, after;
>> +
>> +	SAFE_STATFS(MNTPOINT,&before);
>> +	TST_EXP_PASS(do_quotactl(fd, QCMD(Q_XQUOTARM, USRQUOTA), tst_device->dev, 0,
>> +			(void *)&valid_type), "do_quotactl(Q_XQUOTARM,valid_type)");
>> +	SAFE_STATFS(MNTPOINT,&after);
>> +	if (before.f_bavail<= after.f_bavail)
>> +		tst_res(TPASS, "Q_XQUOTARM to free space, delta(%lu)", after.f_bavail - before.f_bavail);
>>   	else
>> -		tst_res(TFAIL, "Q_XQUOTARM doesn't have quota type check");
>> +		tst_res(TFAIL, "Q_XQUOTARM to free space, delta(-%lu)", before.f_bavail - after.f_bavail);
>> +
>> +	TST_EXP_FAIL(do_quotactl(fd, QCMD(Q_XQUOTARM, USRQUOTA), tst_device->dev, 0,
>> +			(void *)&invalid_type), EINVAL, "do_quotactl(Q_XQUOTARM, invalid_type)");
>>   }
>>
>>   static void setup(void)
>>   {
>> -	TEST(quotactl(QCMD(Q_XQUOTAOFF, USRQUOTA), tst_device->dev, 0, (void *)&qflag_acct));
>> -	if (TST_RET == -1)
>> -		tst_brk(TBROK | TTERRNO, "quotactl with Q_XQUOTAOFF failed");
>> +	quotactl_info();
>> +
>> +	/* ensure superblock has quota data, but not running */
>> +	SAFE_MOUNT(tst_device->dev, MNTPOINT, tst_device->fs_type, 0, "usrquota");
>> +	mount_flag = 1;
>> +	SAFE_UMOUNT(MNTPOINT);
>> +	mount_flag = 0;
>> +	SAFE_MOUNT(tst_device->dev, MNTPOINT, tst_device->fs_type, 0, "noquota");
>> +	mount_flag = 1;
>
> Maybe just SAFE_MOUNT(tst_device->dev, MNTPOINT, tst_device->fs_type, 0, "remount, noquota") ?
>
> If we can remount the device without umounting it the code would be a
> bit shorter.
>
It seems use MS_REMOUNT flag doesn't work well, the quota feature is 
still on and will report EINVAL error when using Q_XQUOTARM syscall.

Also, send a email to xfs maintainer to prove whether  it is a expected 
behaviour.

ps: I will merge this first, then I will add a comment to clarify this 
when I know the reason for xfs maintainer.

Best Regards
Yang Xu
> Anyways looks good to me:
>
> Reviewed-by: Cyril Hrubis<chrubis@suse.cz>
>