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. ATTRIBUTE_TEMPORARY is the one I'm eyeing; I've been planning tmpfile support in bcachefs, it'll turn fsyncs into noops and also ensure files are deleted on unmount/remount.
