svn commit: r318757 - head

[Colin Percival]

On 05/23/17 14:39, Allan Jude wrote:
> On 2017-05-23 17:33, Alexey Dokuchaev wrote:
>> On Tue, May 23, 2017 at 08:25:49PM +0000, Ed Maste wrote:
>>> New Revision: 318757
>>> URL: https://svnweb.freebsd.org/changeset/base/318757
>>>
>>> Log:
>>>   Add note to UPDATING for ino64 to follow the standard upgrade process
>>> ...
>>> +20170523:
>>> +	The "ino64" 64-bit inode project has been committed, which extends
>>> +	a number of types to 64 bits.
>>
>> For the dumb people among us, what is it all about?  E.g., what's so cool
>> about it?
> 
> 64bit inodes allow you to have more than 4 billion files in one file
> system, or NFS mount.

It can avoid problems on NFS even if you have less than 2^32 files, since
NFS uses 64-bit fileids and is not required to use the values 0, 1, 2, 3...
for files.  In Amazon EFS for example every fileid is > 2^32 and there's no
guarantee that two files won't map to the same 32-bit inode # (pre-ino64,
we simply reduced the fileid mod 2^32 to generate an inode #).

-- 
Colin Percival
Security Officer Emeritus, FreeBSD | The power to serve
Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid