[PATCH v12 40/49] nfsd: Add support for unmapped richace identifiers

[Andreas Gruenbacher]

Add support for encoding unmapped identifiers in richacl entries: local
filesystems are not usually supposed to store unmapped identifiers, but
allowing that for debugging purposes can be useful; for that, nfsd must
also be able to encode them.

Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
---
 fs/nfsd/acl.h     |  2 +-
 fs/nfsd/nfs4acl.c | 17 +++++++++++------
 fs/nfsd/nfs4xdr.c |  4 ++--
 3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/fs/nfsd/acl.h b/fs/nfsd/acl.h
index d73c664..4935144 100644
--- a/fs/nfsd/acl.h
+++ b/fs/nfsd/acl.h
@@ -51,7 +51,7 @@ struct svc_rqst;
 __be32 nfsd4_decode_ace_who(struct richace *ace, struct svc_rqst *rqstp,
 			    char *who, u32 len);
 __be32 nfsd4_encode_ace_who(struct xdr_stream *xdr, struct svc_rqst *rqstp,
-			    struct richace *ace);
+			    struct richace *ace, struct richacl *acl);
 
 struct richacl *nfsd4_get_acl(struct svc_rqst *rqstp, struct dentry *dentry);
 __be32 nfsd4_set_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c
index f017a76..3cc83fd 100644
--- a/fs/nfsd/nfs4acl.c
+++ b/fs/nfsd/nfs4acl.c
@@ -885,17 +885,22 @@ __be32 nfsd4_decode_ace_who(struct richace *ace, struct svc_rqst *rqstp,
 }
 
 __be32 nfsd4_encode_ace_who(struct xdr_stream *xdr, struct svc_rqst *rqstp,
-			    struct richace *ace)
+			    struct richace *ace, struct richacl *acl)
 {
-	if (ace->e_flags & RICHACE_SPECIAL_WHO) {
-		unsigned int special_id = ace->e_id.special;
+	if (ace->e_flags & (RICHACE_SPECIAL_WHO | RICHACE_UNMAPPED_WHO)) {
 		const char *who;
 		unsigned int len;
 		__be32 *p;
 
-		if (!nfs4acl_special_id_to_who(special_id, &who, &len)) {
-			WARN_ON_ONCE(1);
-			return nfserr_serverfault;
+		if (ace->e_flags & RICHACE_SPECIAL_WHO) {
+			if (!nfs4acl_special_id_to_who(ace->e_id.special,
+						       &who, &len)) {
+				WARN_ON_ONCE(1);
+				return nfserr_serverfault;
+			}
+		} else {
+			who = richace_unmapped_identifier(ace, acl);
+			len = strlen(who);
 		}
 		p = xdr_reserve_space(xdr, len + 4);
 		if (!p)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 33d028c..8728d0e 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2325,7 +2325,7 @@ static __be32 nfsd4_encode_acl_entries(struct xdr_stream *xdr,
 {
 	__be32 *p;
 
-	flags_mask &= ~RICHACE_SPECIAL_WHO;
+	flags_mask &= ~(RICHACE_SPECIAL_WHO | RICHACE_UNMAPPED_WHO);
 
 	p = xdr_reserve_space(xdr, 4);
 	if (!p)
@@ -2347,7 +2347,7 @@ static __be32 nfsd4_encode_acl_entries(struct xdr_stream *xdr,
 			*p++ = cpu_to_be32(ace->e_type);
 			*p++ = cpu_to_be32(ace->e_flags & flags_mask);
 			*p++ = cpu_to_be32(ace->e_mask & ace_mask);
-			status = nfsd4_encode_ace_who(xdr, rqstp, ace);
+			status = nfsd4_encode_ace_who(xdr, rqstp, ace, acl);
 			if (status)
 				return status;
 		}
-- 
2.5.0

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