linux-kernel - [PATCH v5 39/39] nfs: Add support for the v4.1 dacl attribute

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Message-Id: <1437570209-29832-40-git-send-email-andreas.gruenbacher@gmail.com>
Date:	Wed, 22 Jul 2015 15:03:29 +0200
From:	Andreas Gruenbacher <andreas.gruenbacher@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-api@...r.kernel.org, samba-technical@...ts.samba.org,
	linux-security-module@...r.kernel.org,
	Andreas Gruenbacher <agruenba@...hat.com>
Subject: [PATCH v5 39/39] nfs: Add support for the v4.1 dacl attribute

From: Andreas Gruenbacher <agruenba@...hat.com>

The dacl attribute includes Automatic Inheritance flags not supported by the
acl attribute.  it is only supported in NFS version 4.1 and higher.  On systems
where NFS version 4.0 is still the default, an additional mount option is
needed:

    mount -t nfs4 -o minorversion=1 [...]

Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com>
---
 fs/nfs/nfs4proc.c       |  2 +-
 fs/nfs/nfs4xdr.c        | 55 ++++++++++++++++++++++++++++++++++++++++++-------
 include/linux/nfs_xdr.h |  2 +-
 3 files changed, 50 insertions(+), 9 deletions(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 5ba49c3..39f5548 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4469,7 +4469,7 @@ static struct richacl *__nfs4_get_acl_uncached(struct inode *inode)
 	struct nfs_server *server = NFS_SERVER(inode);
 	struct page *pages[DIV_ROUND_UP(NFS4ACL_SIZE_MAX, PAGE_SIZE)] = {};
 	struct nfs_getaclargs args = {
-		.fh = NFS_FH(inode),
+		.inode = inode,
 		.acl_pages = pages,
 		.acl_len = ARRAY_SIZE(pages) * PAGE_SIZE,
 	};
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 85270df..06f5759 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -1649,9 +1649,16 @@ encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compoun
 	encode_nfs4_stateid(xdr, &zero_stateid);
 
 	/* Encode attribute bitmap. */
-	p = reserve_space(xdr, 2*4);
-	*p++ = cpu_to_be32(1);
-	*p = cpu_to_be32(FATTR4_WORD0_ACL);
+	if (arg->server->attr_bitmask[1] & FATTR4_WORD1_DACL) {
+		p = reserve_space(xdr, 3*4);
+		*p++ = cpu_to_be32(2);
+		*p++ = 0;
+		*p = cpu_to_be32(FATTR4_WORD1_DACL);
+	} else {
+		p = reserve_space(xdr, 2*4);
+		*p++ = cpu_to_be32(1);
+		*p = cpu_to_be32(FATTR4_WORD0_ACL);
+	}
 
 	attrlen_offset = xdr->buf->len;
 	xdr_reserve_space(xdr, 4);  /* to be backfilled later */
@@ -2486,9 +2493,12 @@ static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
 
 	encode_compound_hdr(xdr, req, &hdr);
 	encode_sequence(xdr, &args->seq_args, &hdr);
-	encode_putfh(xdr, args->fh, &hdr);
+	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
 	replen = hdr.replen + op_decode_hdr_maxsz + 1;
-	encode_getattr_two(xdr, FATTR4_WORD0_ACL, FATTR4_WORD1_MODE, &hdr);
+	if (NFS_SERVER(args->inode)->attr_bitmask[1] & FATTR4_WORD1_DACL)
+		encode_getattr_two(xdr, 0, FATTR4_WORD1_MODE | FATTR4_WORD1_DACL, &hdr);
+	else
+		encode_getattr_two(xdr, FATTR4_WORD0_ACL, FATTR4_WORD1_MODE, &hdr);
 
 	xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
 		args->acl_pages, 0, args->acl_len);
@@ -5376,14 +5386,28 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
 
 	if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
 		return -EIO;
-	if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
+
+	if (bitmap[0] & FATTR4_WORD0_ACL) {
+		struct richace *ace;
+
+		if (bitmap[1] & FATTR4_WORD1_DACL)
+			return -EIO;
+
 		acl = decode_acl_entries(xdr, res->server);
 		status = PTR_ERR(acl);
 		if (IS_ERR(acl))
 			goto out;
+
+		status = -EIO;
+		richacl_for_each_entry(ace, acl) {
+			if (ace->e_flags & RICHACE_INHERITED_ACE)
+				goto out;
+		}
 		bitmap[0] &= ~FATTR4_WORD0_ACL;
-	} else
+	} else if (!(bitmap[1] & FATTR4_WORD1_DACL)) {
 		status = -EOPNOTSUPP;
+		goto out;
+	}
 
 	status = -EIO;
 	if (unlikely(bitmap[0]))
@@ -5391,6 +5415,23 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
 
 	if ((status = decode_attr_mode(xdr, bitmap, &res->mode)) < 0)
 		goto out;
+	if (bitmap[1] & FATTR4_WORD1_DACL) {
+		unsigned int flags;
+		__be32 *p;
+
+		p = xdr_inline_decode(xdr, 4);
+                status = -EIO;
+                if (unlikely(!p))
+                        goto out;
+                flags = be32_to_cpup(p);
+
+		acl = decode_acl_entries(xdr, res->server);
+		status = PTR_ERR(acl);
+		if (IS_ERR(acl))
+			goto out;
+		acl->a_flags = flags;
+		bitmap[1] &= ~FATTR4_WORD1_DACL;
+	}
 	status = 0;
 
 out:
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index f1c8f93..abe0b66 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -695,7 +695,7 @@ struct nfs_setaclres {
 
 struct nfs_getaclargs {
 	struct nfs4_sequence_args 	seq_args;
-	struct nfs_fh *			fh;
+	struct inode *			inode;
 	size_t				acl_len;
 	struct page **			acl_pages;
 };
-- 
2.4.3

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