NFS: nfsacl_{encode,decode} should return signed integer

Clean up.

The nfsacl_encode() and nfsacl_decode() functions return negative
errno values, and each call site verifies that the returned value
is not negative.  Change the synopsis of both of these functions
to reflect this usage.

Document the synopsis and return values.

Reported-by: Trond Myklebust <trond.myklebust@netapp.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs_common/nfsacl.c b/fs/nfs_common/nfsacl.c
index fc1c52571c03ea9eaf0d4e96a4026f119cd026e9..a3e78bd186794362d602352aad914d4cb1b5613b 100644 (file)
--- a/fs/nfs_common/nfsacl.c
+++ b/fs/nfs_common/nfsacl.c
@@ -72,9 +72,20 @@ xdr_nfsace_encode(struct xdr_array2_desc *desc, void *elem)
        return 0;
 }
 
-unsigned int
-nfsacl_encode(struct xdr_buf *buf, unsigned int base, struct inode *inode,
-             struct posix_acl *acl, int encode_entries, int typeflag)
+/**
+ * nfsacl_encode - Encode an NFSv3 ACL
+ *
+ * @buf: destination xdr_buf to contain XDR encoded ACL
+ * @base: byte offset in xdr_buf where XDR'd ACL begins
+ * @inode: inode of file whose ACL this is
+ * @acl: posix_acl to encode
+ * @encode_entries: whether to encode ACEs as well
+ * @typeflag: ACL type: NFS_ACL_DEFAULT or zero
+ *
+ * Returns size of encoded ACL in bytes or a negative errno value.
+ */
+int nfsacl_encode(struct xdr_buf *buf, unsigned int base, struct inode *inode,
+                 struct posix_acl *acl, int encode_entries, int typeflag)
 {
        int entries = (acl && acl->a_count) ? max_t(int, acl->a_count, 4) : 0;
        struct nfsacl_encode_desc nfsacl_desc = {
@@ -224,9 +235,18 @@ posix_acl_from_nfsacl(struct posix_acl *acl)
        return 0;
 }
 
-unsigned int
-nfsacl_decode(struct xdr_buf *buf, unsigned int base, unsigned int *aclcnt,
-             struct posix_acl **pacl)
+/**
+ * nfsacl_decode - Decode an NFSv3 ACL
+ *
+ * @buf: xdr_buf containing XDR'd ACL data to decode
+ * @base: byte offset in xdr_buf where XDR'd ACL begins
+ * @aclcnt: count of ACEs in decoded posix_acl
+ * @pacl: buffer in which to place decoded posix_acl
+ *
+ * Returns the length of the decoded ACL in bytes, or a negative errno value.
+ */
+int nfsacl_decode(struct xdr_buf *buf, unsigned int base, unsigned int *aclcnt,
+                 struct posix_acl **pacl)
 {
        struct nfsacl_decode_desc nfsacl_desc = {
                .desc = {

diff --git a/include/linux/nfsacl.h b/include/linux/nfsacl.h
index f321b578edeb452358497e832815d6cae6b36886..fabcb1e5c460f240ff1f9c5e5b1d6d720505d7c5 100644 (file)
--- a/include/linux/nfsacl.h
+++ b/include/linux/nfsacl.h
@@ -51,10 +51,10 @@ nfsacl_size(struct posix_acl *acl_access, struct posix_acl *acl_default)
        return w;
 }
 
-extern unsigned int
+extern int
 nfsacl_encode(struct xdr_buf *buf, unsigned int base, struct inode *inode,
              struct posix_acl *acl, int encode_entries, int typeflag);
-extern unsigned int
+extern int
 nfsacl_decode(struct xdr_buf *buf, unsigned int base, unsigned int *aclcnt,
              struct posix_acl **pacl);