Comments (3)
ok, So query_information(FileEaInformation)
and set_file_information(FileEaInformation)
seem to be a legacy API for small xattrs. Combined maximum length of 0xffff.
The functions come in as "binary blob" - similar to readdir, each entry has a next
offset, name length, value length followed by name and value, there is some 4 byte padding between structs.
Our code should iterate through the struct, and call the ZFS APIs zpl_xattr_set_sa()
zfs_get_xattrdir()
zfs_obtain_xattr
and zfs_read
/zfs_write
to deal with the value.
readdir
should also be able to return EAs, which could be a pain.
If a valuelen is 0, it should remove xattr (nvlist_remove
/ zfs_remove
).
Full XATTRs appear to be ADS (alternate data stream) - also discussed in #34
ADS are encoded in the name, as in filename.txt:streamname:type
- where type is NTFS specific (like $OBJECT_ID, $EA, $BITMAP, ...) but we should at least handle $DATA
. The default, normal datastream has no name, so is filename.txt::$DATA
.
Apart from the filename parsing, converting streams into ZFS XATTRs should be easy, as they are almost the same.
https://docs.microsoft.com/en-us/windows/desktop/fileio/file-streams
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