I was prototyping returning some of the NTFS pseudo-extended attributes in cifs.ko over SMB3 protocol (cifs.ko Linux kernel driver for accessing Windows, Macs, Samba and various NAS devices using CIFS or SMB3 protocol), and using the same names for convenience may be useful if there are any tools that depend on these since they may be reusable (and the metadata is very similar in NTFS and in the SMB3 protocol). In ntfs-3g I noticed the following set of extended attributes for the additional metadata that NTFS userspace driver can return (and these pseudo-xattrs do seem to work on current Fedora when I run getfattr on them e.g. "getattr -n system.ntfs_dos_name filename"): static const char nf_ns_xattr_ntfs_acl[] = "system.ntfs_acl"; static const char nf_ns_xattr_attrib[] = "system.ntfs_attrib"; static const char nf_ns_xattr_attrib_be[] = "system.ntfs_attrib_be"; static const char nf_ns_xattr_efsinfo[] = "system.ntfs_efsinfo"; static const char nf_ns_xattr_reparse[] = "system.ntfs_reparse_data"; static const char nf_ns_xattr_object_id[] = "system.ntfs_object_id"; static const char nf_ns_xattr_dos_name[] = "system.ntfs_dos_name"; static const char nf_ns_xattr_times[] = "system.ntfs_times"; static const char nf_ns_xattr_times_be[] = "system.ntfs_times_be"; static const char nf_ns_xattr_crtime[] = "system.ntfs_crtime"; static const char nf_ns_xattr_crtime_be[] = "system.ntfs_crtime_be"; static const char nf_ns_xattr_ea[] = "system.ntfs_ea"; static const char nf_ns_xattr_posix_access[] = "system.posix_acl_access"; static const char nf_ns_xattr_posix_default[] = "system.posix_acl_default"; static const char nf_ns_alt_xattr_efsinfo[] = "user.ntfs.efsinfo"; In addition, I see pseudo-xattr "ntfs.streams.list" in the ntfs source code, but I get a "no such attribute" returned by getfattr when I try to query that one directly unless mounted with "streams_interface=windows" The "-o user_xattr" mount option doesn't seem to be good enough. Also FYI - I do have a patch to cifs.ko to query this pseudo-xattr when mounted over SMB3 protocol. Two quick questions: 1) are there ntfs userspace tools to more sanely dump the blobs for any of these (e.g. for ACLs it could be similar to cacls.exe in Windows or smbcacls in Samba/Linux and would be very useful for viewing ACL information, for backup and for migration, but dumping the creation time or reparse info could also be very useful). 2) Are there other psuedo-xattrs possible or being considered for adding to ntfs-3g (e.g. for quota information, or for claims based ACLs)? I would like to use a similar format to make tools easier. -- Thanks, Steve -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
