[Bugs] [Bug 1452961] New: [PATCH] incorrect xattr list handling on FreeBSD

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1452961

            Bug ID: 1452961
           Summary: [PATCH] incorrect xattr list handling on FreeBSD
           Product: GlusterFS
           Version: 3.10
         Component: posix
          Assignee: bugs at gluster.org
          Reporter: nfsmwlin at gmail.com
                CC: bugs at gluster.org



Created attachment 1280683
  --> https://bugzilla.redhat.com/attachment.cgi?id=1280683&action=edit
patch

Description of problem:
The Linux llistxattr() system call and the FreeBSD extattr_list_link() system
call    both get the list of xattrs, but in different format (check the
manpages):

Linux: attr<\0>attr<\0>
FreeBSD: <attr_len>attr<attr_len>attr

But in the caller sys_llistxattr and sys_flistxattr do not take the format
difference into account.

This patch is based on v3.9.0, it fixes the problem by introducing a new
function extattr_list_reshape to reshape the FreeBSD list format into Linux's.

This patch is authored by Iblis Lin <iblis at hs.ntnu.edu.tw> and tested by
Pellaeon Lin <pellaeon at cnmc.tw>

For your reference, here's the Gist comparing GDB output of volume process with
and without patch:
https://gist.github.com/pellaeon/bfa9b094e11b47a88bf51f5aa73b9a6d

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