I didn't hardlink directories, I just patched stat, lstat and fstat to
always return st_ino == 0 --- and I've seen those failures. These failures
are going to happen on non-POSIX filesystems in real world too, very
rarely.
I don't want to spoil your day but testing with st_ino==0 is a bad choice
because it is a special number. Anyway, one can only find breakage,
not prove that all the other programs handle this correctly so this is
kind of pointless.
On any decent filesystem st_ino should uniquely identify an object and
reliably provide hardlink information. The UNIX world has relied upon this
for decades. A filesystem with st_ino collisions without being hardlinked
(or the other way around) needs a fix.
... and that's the problem --- the UNIX world specified something that
isn't implementable in real world.
Sure it is. Numerous popular POSIX filesystems do that. There is a lot of
inode number space in 64 bit (of course it is a matter of time for it to
jump to 128 bit and more)
If the filesystem was designed by someone not from Unix world (FAT, SMB,
...), then not. And users still want to access these filesystems.
64-bit inode numbers space is not yet implemented on Linux --- the problem
is that if you return ino >= 2^32, programs compiled without
-D_FILE_OFFSET_BITS=64 will fail with stat() returning -EOVERFLOW --- this
failure is specified in POSIX, but not very useful.
Mikulas
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