Fixes for xattr on Linux

- A very unlikely failure where getxattr returns an error code the first time
  but succeeds the second time could cause buffer overrun and corruption.

Affecting the tests only:

- On Linux (and presumably Irix) normal users can only modify attributes in
  the 'user.' namespace.
- Some filesystems can have strict limits on value size (eg. 1024 bytes on
  ext3 depending on block size)
- ENOATTR is defined in xattr/xattr.h. This file is an optional install and is
  not needed for the rest of box to use extended attributes. Provide it
  ourselves if not present.

0 files changed, 0 insertions, 0 deletions