On 19-Oct-09, at 13:45, Steve French wrote:
On Mon, Oct 19, 2009 at 1:55 PM, Andreas Dilger <adilger@xxxxxxx>
wrote:
I had proposed in the past that these file attributes be exposed to
userspace as virtual xattrs, e.g. user.cr_time returning a struct
timespec, but the data is stored internal to the filesystem in
whatever
format is most efficient for it. We only strictly need user.crtime
for this, but I wouldn't object to exporting other inode attributes
in
this way (e.g. user.mtime, user.atime, etc).
Yes - the fake xattr approach was the approach that I preferred
(since I could do this trivially to cifs, and for ext4 it seems
equally easy),
but I wonder if this "path based" approach is slightly harder for
Samba,
since for most cases Samba maps to "handle based" equivalents
(when the same operation can come in eitherpath based or
handle based - Samba mostly maps to handle based).
Could you please elaborate what you mean by "path based" for xattrs?
They can be gotten with sys_fgetxattr() from a file handle just as
easily as from the filename.
I definitely agree with having a common attribute name for these.
As for being able to write to the "create time" attribute, I would
prefer
that this be a filesystem mount option. For some users (myself
included)
I don't care whether Windows is unhappy that it can't update this
creation
time - I'd prefer to know when a file is actually created.
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
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