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nfsd: add fattr support for user extended attributes

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Check if user extended attributes are supported for an inode,
and return the answer when being queried for file attributes.

An exported filesystem can now signal its RFC8276 user extended
attributes capability.

Signed-off-by: Frank van der Linden <fllinden@amazon.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Frank van der Linden 2020-06-23 22:39:27 +00:00 committed by Chuck Lever
parent 23e50fe3a5
commit 0e885e846d
1 changed files with 9 additions and 0 deletions
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9
fs/nfsd/nfs4xdr.c
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@ -3213,6 +3213,15 @@ out_acl:
}
#endif
if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
err = xattr_supported_namespace(d_inode(dentry),
XATTR_USER_PREFIX);
*p++ = cpu_to_be32(err == 0);
}
attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
status = nfs_ok;