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[RFC,33/35] nfsd: add fattr support for user extended attributes

Message ID c66bc3c8b4ac4ed35e4789976f3c2b9d1b187a74.1568309119.git.fllinden@amazon.com (mailing list archive)
State New, archived
Headers show
Series user xattr support (RFC8276) | expand

Commit Message

Frank van der Linden Sept. 2, 2019, 9:30 p.m. UTC 
Check if user extended attributes are supported for an inode,
and return the answer when being queried for file attributes.

Signed-off-by: Frank van der Linden <fllinden@amazon.com>
---
 fs/nfsd/nfs4xdr.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
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Patch

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index be57dc09a468..92b9a067c744 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3149,6 +3149,17 @@  nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
 	}
 #endif
 
+#ifdef CONFIG_NFSD_V4_XATTR
+	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);
+	}
+#endif
+
 	attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
 	write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
 	status = nfs_ok;