Re: [LSF/MM/BPF TOPIC] statx attributes

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On Thu, Mar 7, 2024 at 2:04 PM Steve French <smfrench@xxxxxxxxx> wrote:
>
> On Thu, Mar 7, 2024 at 11:45 AM Kent Overstreet
> <kent.overstreet@xxxxxxxxx> wrote:
> >
> > On Thu, Mar 07, 2024 at 10:37:13AM -0600, Steve French wrote:
> > > > Which API is used in other OS to query the offline bit?
> > > > Do they use SMB specific API, as Windows does?
> > >
> > > No it is not smb specific - a local fs can also report this.  It is
> > > included in the attribute bits for files and directories, it also
> > > includes a few additional bits that are used by HSM software on local
> > > drives (e.g. FILE_ATTRIBUTE_PINNED when the file may not be taken
> > > offline by HSM software)
> > > ATTRIBUTE_HIDDEN
> > > ATTRIBUTE_SYSTEM
> > > ATTRIBUTE_DIRECTORY
> > > ATTRIGBUTE_ARCHIVE
> > > ATTRIBUTE_TEMPORARY
> > > ATTRIBUTE_SPARSE_FILE
> > > ATTRIBUTE_REPARE_POINT
> > > ATTRIBUTE_COMPRESSED
> > > ATTRIBUTE_NOT_CONTENT_INDEXED
> > > ATTRIBUTE_ENCRYPTED
> > > ATTRIBUTE_OFFLINE
> >
> > we've already got some of these as inode flags available with the
> > getflags ioctl (compressed, also perhaps encrypted?) - but statx does
> > seem a better place for them.
> >
> > statx can also report when they're supported, which does make sense for
> > these.
> >
> > ATTRIBUTE_DIRECTORY, though?
> >
> > we also need to try to define the semantics for these and not just dump
> > them in as just a bunch of identifiers if we want them to be used by
> > other things - and we do.
>
> They are all pretty clearly defined, but many are already in Linux,
> and a few are not relevant (e.g. ATTRIBUTE_DIRECTORY is handled in
> mode bits).  I suspect that Macs have equivalents of most of these
> too.

MacOS and FreeBSD return many of these in stat(2) output via st_flags.
Current set of supported flags are documented in chflags(2) manpage on both
platforms.





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