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    SubjectRe: BIG files & file systems
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    On Wed, 2002-07-31 at 22:51, Jan Harkes wrote:
    > On Wed, Jul 31, 2002 at 05:13:46PM -0400, Alexander Viro wrote:
    > > On Wed, 31 Jul 2002, Jan Harkes wrote:
    > > > On Wed, Jul 31, 2002 at 01:16:20PM -0600, Peter J. Braam wrote:
    > > > > I've just been told that some "limitations" of the following kind will
    > > > > remain:
    > > > > page index = unsigned long
    > > > > ino_t = unsigned long
    > > >
    > > > The number of files is not limited by ino_t, just look at the
    > > > iget5_locked operation in fs/inode.c. It is possible to have your own
    > > > n-bit file identifier, and simply provide your own comparison function.
    > > > The ino_t then becomes the 'hash-bucket' in which the actual inode is
    > > > looked up.
    > >
    > > You _do_ need unique ->st_ino from stat(2), though - otherwise tar(1)
    > > and friends will break in all sorts of amusing ways. And there's
    > > nothing kernel can do about that - applications expect 32bit st_ino
    > > (compare them as 32bit values, etc.)
    >
    > Which is why "tar and friends" are to different extents already broken
    > on various filesystems like Coda, NFS, NTFS, ReiserFS, and probably XFS.
    > (i.e. anything that currently uses iget5_locked instead of iget to grab
    > the inode).

    Why are they broken? In the case of XFS at least you still get a unique
    and stable inode number back - and it fits in 32 bits too.

    Steve


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