Re: named streams, extended attributes, and posix

[Mo McKinlay]

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Today, Michael Rothwell ([e-mail]) wrote:

  > So, openstream() is probably the most painless way to get named streams
  > support into Linux in the immediate future. Openstream() will have to
  > fail on filesystems that do not support streams, ideally without
  > changing those filesystems.

Agree - I'd imagine with the same error that trying to symlink on a
filesystem which does not support symlinks produces ("Operation not
permitted"?).

  >  And as long as we're adding a system call to
  > deal with streams, we should consider adding the functions for extended
  > attributes at the same time.

Agree.

  > >From http://www.flyingbuttmonkeys.com/streams-on-posix.txt ...
  >
  > Minimum VFS Support
  > vop_eattr_get - read an EA
  > vop_eattr_set - set an EA
  > vop_eattr_remove - remove an EA
  > vop_eattr_list - list the EAs like vop_readdir would a directory.
  >
  > Optional Support
  > vop_eattr_create - Create an EA or error if it exists.
  > vop_eattr_multi - perform a sequence of EA vops atomically.
  > vop_eattr_rename - change the name of an EA
  > vop_eattr_serialize - export all the EAs as a stream of entries.
  >
  > Thoughts? You mught want to refer back to the paper to get the whole EAs
  > proposal...

I shall, and get back to you this evening (workworkworkwork... :)

Mo.

- -- 
Mo McKinlay
[e-mail]
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