Re: [LTP] [PATCH] performing test on loop device if noatime or relatime specified

[Cyril Hrubis <chrubis@suse.cz>]

Hi!
> then compile error:
> gcc -g -O2 -g -O2 -fno-strict-aliasing -pipe -Wall -W -g -O2 -Wold-style-definition -D_FORTIFY_SOURCE=2 -I/home/cuibixuan/home/git/ltp/ltp/testcases/kernel/include -I../../../../include -I../../../../include   -L../../../../lib  open12.c   -lltp -o open12
> open12.c: In function ?setup?:
> open12.c:103: error: ?MS_STRICTATIME? undeclared (first use in this function)
> open12.c:103: error: (Each undeclared identifier is reported only once
> open12.c:103: error: for each function it appears in.)
> make[4]: *** [open12] Error 1
> make[4]: Leaving directory `/home/cuibixuan/home/git/ltp/ltp/testcases/kernel/syscalls/open'
> 
> Do 'man mount' and can not find 'MS_STRICTATIME'.
> 
> I get from man-pages of linux:
> MS_STRICTATIME (since Linux 2.6.30)
>               Always update the last access time (atime) when files on this
>               filesystem are accessed.  (This was the default behavior
>               before Linux 2.6.30.)  Specifying this flag overrides the
>               effect of setting the MS_NOATIME and MS_RELATIME flags.
> 
> If not support 'MS_STRICTATIME'?
> My system is SUSE11-SP2, linux 3.0.13, and gcc version 4.3.4.

Solution to compilation failures is to add fallback definition into
ltp/include/lapi/mount.h (have a look at ltp/include/lapi/fcntl.h) and
include it in the testcase source. That would make the testcase compile,
but it may still fail when executed. To fix the execution we would need
to do a runtime check if the kernel supports this flag, I guess that we
would need to pass it only on newer kernels (we use tst_kvercmp() for
that).

-- 
Cyril Hrubis
chrubis@suse.cz

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