Date: Sun, 1 Dec 2013 23:05:32 +0100 From: Lionel Cons <lionelcons1972@gmail.com> To: Tim Kientzle <tim@kientzle.com> Cc: Rick Macklem <rmacklem@uoguelph.ca>, Cedric Blancher <cedric.blancher@gmail.com>, Freebsd hackers list <freebsd-hackers@freebsd.org>, Richard Yao <ryao@gentoo.org>, Pedro Giffuni <pfg@freebsd.org>, Jordan Hubbard <jkh@mail.turbofuzz.com> Subject: Re: O_XATTR support in FreeBSD? Message-ID: <CAPJSo4WvVpjUGkcOFcX19x%2BYBDp3eaf_j=UuoT7epoYmUCcWJQ@mail.gmail.com> In-Reply-To: <706707CA-BD52-4814-BCCE-EB044B062BA6@kientzle.com> References: <BC41DB59-5868-432D-9452-00F420934E12@mail.turbofuzz.com> <718836647.19911209.1385302696963.JavaMail.root@uoguelph.ca> <CALXu0UfEQD2y6m5irGQRms=6bY8H854v0Wu9_96JpL4w6wntcg@mail.gmail.com> <706707CA-BD52-4814-BCCE-EB044B062BA6@kientzle.com>
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On 27 November 2013 05:52, Tim Kientzle <tim@kientzle.com> wrote: > > On Nov 26, 2013, at 1:51 AM, Cedric Blancher <cedric.blancher@gmail.com> wrote: > >> 5. Support for tar and pax is already there. Its described in >> Solaris's fsattr man page, they use a extended header with filename >> /dev/null (to prevent older tar versions from tripping over the new >> headers) and then have a named attribute header which describes the >> attributes names and flags. > > There are quite a few alternative approaches for storing > extended attributes in tar and pax files. But this discussion is *not* about extended attributes, this discussion is about Alternate Data Streams. Unfortunately the O_XATTR discussion somehow started to cover the Linux "extended attribute system", which is utterly useless in the intended use cases (as said, no access through normal POSIX read(), write(), mmap(), no unlimited size, no sparse data support (aka SEEK_HOLE, SEEK_DATA) etc etc). Lionel
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