Joe Krahn:
> Maybe it is an XFS issue for symlinks, but what about cases where
> st_size is zero for regular non-empty files?
I am confused.
Your problem may be unrelated to symlink on XFS.
(from your first mail)
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There is a bug in aufs where fstat() returns a st_size value of zero.
This causes cpio to fail on symlinks because st_size is supposed to be
the symlink string length. It also causes 'du' to return usage sizes of
zero unless the "--apparent" option is used.
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fstat(2) for symlink returns the data of its target file instead of the
symlink itself.
$ ln -s real_file symlink
and run the C program.
{
fd = open("symlink");
fstat(fd)
}
Then you will get the data of "real_file" instead of "symlink".
If you (or cpio) want the data of "symlink", you need to issue
lstat("symlink").
> I can try out aufs2. Where do I get it -- is that the fs/aufs25
> directory? There's no use trying to track down bugs for the non-current
> version.
No, aufs2 is
<http://downloads.sourceforge.net/aufs/aufs2-base3-2.6.27.tar.bz2?modtime=1233574764&big_mirror=0>
J. R. Okajima
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