Re: size limit of extended attributes

[Boaz Harrosh <boaz@plexistor.com>]

On 04/30/2015 04:57 PM, Björn JACKE wrote:
> 
> Can we get rid of the 64k size limit for EAs? The API on AIX is the same as on
> Linux.  But there is a huge size limit - which would help us already a lot.
> 

If memory serves me correctly the xattr is always written in one shot
from offset0..xattr_size. At least it is so on the VFS API side.

That said I think there are also two mem-copies on the way to the FS
from the user buffer.

How will you reliably write something bigger than CONST-X in one call?
On all arches. Same goes for read.

> Björn
> 

The hacks need not be so ugly and they can be well documented and poblished
as a public STD.
	./foo-with-streams (With xatters info)
	./.foo-with-streams.__STREAMES__/ (backpointer xattrs-info)
	./.foo-with-streams.__STREAMES__/SA
	./.foo-with-streams.__STREAMES__/SB
	...
  And some special mod bits on the .foo-with-streams.__STREAMES__ directory

The smb read-dir parser removes those hidden directories

Cheers
Boaz

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