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- cleaned up some talloc usage in various files
I'd like to get to the point that we have no calls to talloc(), at
which point we will rename talloc_p() to talloc(), to encourage
everyone to use the typesafe functions.
attributes (streams, EAs, NT ACLs, timestamps etc) to be used on
filesystems that don't support xattrs. It also allows for large
streams, although they are very inefficient.
I won't enable this by default, as I really wrote it as a way of
testing large stream support while still using ext3, but perhaps with
a bit more work this could be generally usable.
To enable this use:
posix:eadb = /home/test/myeas.tdb
based on the current nttoken, which is completely wrong, but works as a start.
The ACL is stored in the xattr system.DosAcl, using a NDR encoded IDL
union with a version number to allow for future expansion.
pvfs does not yet check the ACL for file access. At the moment the ACL
is just query/set.
We also need to do some RPC work to allow the windows ACL editor to be
used. At the moment is queries the ACL fine, but displays an error
when it fails to map the SIDs via rpc.
The trickiest part about this was getting the sharing and locking
rules right, as alternate streams are separate locking spaces from the
main file for the purposes of byte range locking, and separate for
most share violation rules.
I suspect there are still problems with delete on close with alternate
data streams. I'll look at that next.
(the IDL, and the load/save meta-data logic)
- changed pvfs_resolve_name() to default to non-wildcard, needing
PVFS_RESOLVE_WILDCARD to enable wildcards. Most callers don't want
wildcards, so defaulting this way makes more sense.
- fixed deletion of EAs
I decided to use IDL/NDR to encode the attribute, as it gives us a
simple way to describe and extend the saved attributes.
The xattr code needs to hook into quite a few more places in the pvfs
code, but this at least gets the basics done. I will start encoding
alternate data streams streams, DOS EAs etc soon using the same basic
mechanism.
I'll probably stick to "version 1" for the xattr.idl for quite a while
even though it will be changing, as I don't expect anyone to be
deploying this in production just yet. Once we have production users
we will need to keep compatibility by supporting all the old version
numbers in xattr.idl.
