Re: Finding hardlinks

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



> 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.

Generally samefile() is _weaker_ than the st_ino interface in
comparing the identity of two files without using massive amounts of
memory.  You're searching for a better solution, not one that is
broken in a different way, aren't you?

Miklos
-
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux