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Re: [PATCH 2/2] xfstest: fsstress add EXT2_IOC_{SET,GET}FLAGS operations

To: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
Subject: Re: [PATCH 2/2] xfstest: fsstress add EXT2_IOC_{SET,GET}FLAGS operations
From: Alex Elder <aelder@xxxxxxx>
Date: Wed, 5 Oct 2011 08:20:40 -0500
Cc: <xfs@xxxxxxxxxxx>, <linux-ext4@xxxxxxxxxxxxxxx>, <linux-fsdevel@xxxxxxxxxxxxxxx>
In-reply-to: <1316357699-22692-2-git-send-email-dmonakhov@xxxxxxxxxx>
References: <1316357699-22692-1-git-send-email-dmonakhov@xxxxxxxxxx> <1316357699-22692-2-git-send-email-dmonakhov@xxxxxxxxxx>
Reply-to: <aelder@xxxxxxx>
On Sun, 2011-09-18 at 18:54 +0400, Dmitry Monakhov wrote:
> Add two new operations:
> - getattr: ioctl(fd, EXT2_IOC_GETFLAGS, &fl)
> - setattr: ioctl(fd, EXT2_IOC_SETFLAGS, &random_flags)
> By default IOC_SET_SETFLAGS has zero probability because
> it may produce inodes with APPEND or IMMUTABLE flags which
> are not deletable by default. Let's assumes that one who
> enable it knows how to delete such inodes.
> For example like follows:
> find $TEST_PATH -exec chattr -i -a {} \;
> rm -rf $TEST_PATH
> 
> Signed-off-by: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>

I have a question below.  I think this is probably
a good addition, though it should be made so it
works for more than EXTx.

If I understand the way it would be used, this will
simply be another operation that gets randomly performed
by fsstress while it operates, right?

I have not done any testing with this yet.

Reviewed-by: Alex Elder <aelder@xxxxxxx>

. . .

> @@ -1729,6 +1738,58 @@ setxattr_f(int opno, long r)
>  }
>  
>  void
> +getattr_f(int opno, long r)
> +{
> +#ifdef HAVE_EXT2_INCLUDE
> +     int             fd;
> +     int             e;
> +     pathname_t      f;
> +     uint            fl;
> +     int             v;
> +
> +     init_pathname(&f);
> +     if (!get_fname(FT_ANYm, r, &f, NULL, NULL, &v))
> +             append_pathname(&f, ".");

I don't understand the purpose of appending a "." to the
end of the path.  Do you intend to just use "." if
no other file matches?  (That may not be a good thing to
do--it might not be testing the intended target.)
  
Or are you intending to append "/." so for a directory
its "." link gets used in the open?  If so that's not
what this does (it simply makes "a/b/x" become "a/b/x.").

Same comments apply to setattr_f().

> +     fd = open_path(&f, O_RDWR);
> +     e = fd < 0 ? errno : 0;
> +     check_cwd();
> +
> +     e = ioctl(fd, EXT2_IOC_GETFLAGS, &fl);
> +     if (v)
> +             printf("%d/%d: getattr %s %u %d\n", procid, opno, f.path, fl, 
> e);
> +     free_pathname(&f);
> +     close(fd);
> +#endif
> +}
> +
> +void
> +setattr_f(int opno, long r)
> +{


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