Depends-On-Patch: acls.diff

After applying the above patch and this one, run these commands for a
successful build:

    ./prepare-source
    ./configure --enable-acl-support
    make

Philip Lowman wrote:
> Attached is a small patch which is meant to be applied to a copy of
> rsync which has already been patched with acl support (the acls.diff
> file in the patches folder).  It allows the preservation of the delete,
> chmod, and chown bits which Adaptec has added to XFS on their SnapOS NAS
> units.  This is nice for backing up files between different NAS units
> and preserving all of the Samba ACLs.
> 
> I'm not sure how useful this patch will be because I'm not sure if any
> other NAS vendors have standardized on their extensions to POSIX ACLs to
> support Samba in the same manner that Adaptec has.  FWIW, though, this
> will allow you to preserve acls when copying between different Adaptec
> based NAS units running SnapOS.

I (Wayne) tweaked the patch for style and to avoid using SMB_* constants
with literal values were needed.

--- old/acls.c
+++ new/acls.c
@@ -30,9 +30,11 @@ extern int am_root;
 extern int dry_run;
 extern int orig_umask;
 
+typedef unsigned short abits;
+
 typedef struct {
 	id_t id;
-	uchar access;
+	abits access;
 } id_access;
 
 typedef struct {
@@ -41,15 +43,15 @@ typedef struct {
 	id_access *idas;
 } ida_list;
 
-#define NO_ENTRY ((uchar)0x80)
+#define NO_ENTRY ((abits)0x8000)
 typedef struct {
 	ida_list users;
 	ida_list groups;
 	/* These will be NO_ENTRY if there's no such entry. */
-	uchar user_obj;
-	uchar group_obj;
-	uchar mask;
-	uchar other;
+	abits user_obj;
+	abits group_obj;
+	abits mask;
+	abits other;
 } rsync_acl;
 
 static const rsync_acl rsync_acl_initializer =
@@ -148,7 +150,7 @@ static BOOL unpack_smb_acl(rsync_acl *ra
 	     rc = sys_acl_get_entry(sacl, SMB_ACL_NEXT_ENTRY, &entry)) {
 		SMB_ACL_TAG_T tag_type;
 		SMB_ACL_PERMSET_T permset;
-		uchar access;
+		abits access;
 		void *qualifier;
 		id_access *ida;
 		ida_list *idal;
@@ -162,6 +164,9 @@ static BOOL unpack_smb_acl(rsync_acl *ra
 		}
 		access = (sys_acl_get_perm(permset, SMB_ACL_READ) ? 4 : 0)
 		       | (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? 2 : 0)
+		       | (sys_acl_get_perm(permset, SMB_ACL_DELETE) ? 8 : 0)
+		       | (sys_acl_get_perm(permset, SMB_ACL_CHMOD) ? 16 : 0)
+		       | (sys_acl_get_perm(permset, SMB_ACL_CHOWN) ? 32 : 0)
 		       | (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? 1 : 0);
 		/* continue == done with entry; break == store in given idal */
 		switch (tag_type) {
@@ -559,13 +564,19 @@ static void expand_smb_acl_list(smb_acl_
 #define COE(func,args) CALL_OR_ERROR(func,args,#func)
 #define COE2(func,args) CALL_OR_ERROR(func,args,NULL)
 
-static int store_access_in_entry(uchar access, SMB_ACL_ENTRY_T entry)
+static int store_access_in_entry(abits access, SMB_ACL_ENTRY_T entry)
 {
 	const char *errfun = NULL;
 	SMB_ACL_PERMSET_T permset;
 
 	COE( sys_acl_get_permset,(entry, &permset) );
 	COE( sys_acl_clear_perms,(permset) );
+	if (access & 32)
+		COE( sys_acl_add_perm(permset, SMB_ACL_CHOWN) );
+	if (access & 16)
+		COE( sys_acl_add_perm(permset, SMB_ACL_CHMOD) );
+	if (access & 8)
+		COE( sys_acl_add_perm(permset, SMB_ACL_DELETE) );
 	if (access & 4)
 		COE( sys_acl_add_perm,(permset, SMB_ACL_READ) );
 	if (access & 2)
@@ -645,7 +656,7 @@ static BOOL pack_smb_acl(SMB_ACL_T *smb_
 	return False;
 }
 
-static mode_t change_sacl_perms(SMB_ACL_T sacl, uchar mask, mode_t old_mode, mode_t mode)
+static mode_t change_sacl_perms(SMB_ACL_T sacl, abits mask, mode_t old_mode, mode_t mode)
 {
 	SMB_ACL_ENTRY_T entry;
 	int group_id = mask != NO_ENTRY ? SMB_ACL_MASK : SMB_ACL_GROUP_OBJ;
@@ -696,7 +707,7 @@ static mode_t change_sacl_perms(SMB_ACL_
 
 static void receive_rsync_acl(rsync_acl *racl, int f)
 {
-	uchar computed_mask_bits = 0;
+	abits computed_mask_bits = 0;
 	ida_list *idal = NULL;
 	id_access *ida;
 	size_t count;
@@ -708,8 +719,8 @@ static void receive_rsync_acl(rsync_acl 
 
 	while (count--) {
 		char tag = read_byte(f);
-		uchar access = read_byte(f);
-		if (access & ~ (4 | 2 | 1)) {
+		abits access = read_byte(f);
+		if (access & ~(32 | 16 | 8 | 4 | 2 | 1)) {
 			rprintf(FERROR, "receive_rsync_acl: bogus permset %o\n",
 				access);
 			exit_cleanup(RERR_STREAMIO);
--- old/smb_acls.h
+++ new/smb_acls.h
@@ -33,6 +33,11 @@
 #define SMB_ACL_READ		ACL_READ
 #define SMB_ACL_WRITE		ACL_WRITE
 #define SMB_ACL_EXECUTE		ACL_EXECUTE
+/* These are custom ACL bits used by Adaptec's modifications
+ * to XFS on their SnapOS units. */
+#define SMB_ACL_DELETE		0x08
+#define SMB_ACL_CHMOD		0x10
+#define SMB_ACL_CHOWN		0x20
 
 /* Types of ACLs. */
 #define SMB_ACL_USER		ACL_USER