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Date: Fri, 05 Jan 2007 16:15:41 +0100 From: Miklos Szeredi <miklos@...redi.hu> To: mikulas@...ax.karlin.mff.cuni.cz CC: pavel@....cz, matthew@....cx, bhalevy@...asas.com, arjan@...radead.org, jaharkes@...cmu.edu, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, nfsv4@...f.org Subject: Re: Finding hardlinks > > And does it matter? If you rename a file, tar might skip it no matter of > > hardlink detection (if readdir races with rename, you can read none of the > > names of file, one or both --- all these are possible). > > > > If you have "dir1/a" hardlinked to "dir1/b" and while tar runs you delete > > both "a" and "b" and create totally new files "dir2/c" linked to "dir2/d", > > tar might hardlink both "c" and "d" to "a" and "b". > > > > No one guarantees you sane result of tar or cp -a while changing the tree. > > I don't see how is_samefile() could make it worse. > > There are several cases where changing the tree doesn't affect the > correctness of the tar or cp -a result. In some of these cases using > samefile() instead of st_ino _will_ result in a corrupted result. Also note, that using st_ino in combination with samefile() doesn't make the result much better, it eliminates false positives, but cannot fix false negatives. Miklos - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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