Re: [PATCH, RFC] xfstests: add d_type checking to fsstress

[Eric Sandeen <sandeen@sandeen.net>]

On 9/16/13 5:55 PM, Dave Chinner wrote:
> On Mon, Sep 16, 2013 at 04:55:28PM -0500, Eric Sandeen wrote:
>> This patch adds a "-D" switch to fsstress so that every time
>> we call readdir, we stat the dentry & compare it's st_mode
>> to the d_type.
>>
>> If -D is specified only once, it ignores DT_UNKNOWN.  If specified
>> twice, it considers DT_UNKNOWN to be an error.
> 
> Hmmmm. DT_UNKNOWN is actually a valid type on disk right through to the
> userspace interface. I can't think of why we'd want to consider it
> invalid, especially as right now xfs_repair siply zeros the field
> when recreating directory entries...

well, I didn't know that last part.  (but why do that?)

I was thinking along the lines of DT_UNKNOWN returns meaning
"this fs doesn't support d_type."

"If the file type could not be determined, the value DT_UNKNOWN is returned in d_type."

What d_type-grokking fs can't determine its file types?

-Eric

> Cheers,
> 
> Dave.
> 
>> +void test_d_type(int opno, pathname_t *f, struct dirent64 *de)
>> +{
>> +	struct stat64 sb;
>> +	char path[PATH_MAX];
>> +
>> +	snprintf(path, PATH_MAX, "%s/%s", f->path, de->d_name);
>> +
>> +	/* Don't check ./. or ./.. */
>> +	if (!strncmp(path, "./.", 3))
>> +		return;
> 
> . and .. should have the values of DT_UNKNOWN or DT_DIR. They are
> the only valid values for these entries.
> 
>> +
>> +	if (lstat64(path, &sb)) {
>> +		printf("%d/%d: getdents - can't stat %s\n",
>> +			procid, opno, path);
>> +	} else {
>> +		int bad_d_type = 0;
>> +
>> +		switch (de->d_type) {
>> +			case DT_BLK:
>> +				if (!S_ISBLK(sb.st_mode))
>> +					bad_d_type++;
>> +				break;
>> +			case DT_CHR:
>> +				if (!S_ISCHR(sb.st_mode))
>> +					bad_d_type++;
>> +				break;
>> +			case DT_DIR:
>> +				if (!S_ISDIR(sb.st_mode))
>> +					bad_d_type++;
>> +				break;
>> +			case DT_FIFO:
>> +				if (!S_ISFIFO(sb.st_mode))
>> +					bad_d_type++;
>> +				break;
>> +			case DT_LNK:
>> +				if (!S_ISLNK(sb.st_mode))
>> +					bad_d_type++;
>> +				break;
>> +			case DT_REG:
>> +				if (!S_ISREG(sb.st_mode))
>> +					bad_d_type++;
>> +				break;
>> +			case DT_SOCK:
>> +				if (!S_ISSOCK(sb.st_mode))
>> +					bad_d_type++;
>> +				break;
>> +			case DT_UNKNOWN:
>> +				if (verify_d_type > 1)
>> +					bad_d_type++;
>> +			break;
>> +		}
> 
> And DT_WHT? That's defined on disk and in the user interface ;)
> 
> i.e. this will not do the right thing with an unknown de->d_type.
> 
> Cheers,
> 
> Dave.
> 

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