Receiving Solaris11 streams will have 0x20 (spill blocks set) which is

incompatible with us. We will strip this bit and attempt to receive
stream anyway, which has a fair chance of succeeding.

include/sys/zfs_ioctl.h

@@ -82,6 +82,23 @@ typedef enum drr_headertype {
 #define	DMU_BACKUP_FEATURE_DEDUPPROPS	(0x2)
 #define	DMU_BACKUP_FEATURE_SA_SPILL	(0x4)
 
+    /* Unsure what Oracle called this bit */
+#define	DMU_BACKUP_FEATURE_SPILLBLOCKS	(0x20)
+    /*
+NOTE 3:  Fix to 7097870 (spill block can be dropped in some situations during
+         incremental receive) introduces backward incompatibility with zfs
+         send/recv.  I.e., ZFS streams created with this patch will not be
+         receivable with older ZFS versions and it will fail with below error
+         message in destination host:
+
+         "cannot receive: stream has unsupported feature, feature flags = 24"
+
+         This change is to allow important fix in ZFS to avoid metadata
+         corruptions related to ACL.  An upgrade to same or greater version
+         of ZFS is required in destination for ZFS streams to work properly.
+    */
+
+
 /*
  * Mask of all supported backup features
  */

lib/libzfs/libzfs_sendrecv.c

@@ -3236,6 +3236,12 @@ zfs_receive_impl(libzfs_handle_t *hdl, const char *tosnap, recvflags_t *flags,
 	featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
 	hdrtype = DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo);
 
+    if (featureflags & DMU_BACKUP_FEATURE_SPILLBLOCKS) {
+        fprintf(stderr, "Warning: receive stream has Spill Blocks set which may be incompatible with this version.\r\n");
+        featureflags &= ~DMU_BACKUP_FEATURE_SPILLBLOCKS;
+    }
+
+
 	if (!DMU_STREAM_SUPPORTED(featureflags) ||
 	    (hdrtype != DMU_SUBSTREAM && hdrtype != DMU_COMPOUNDSTREAM)) {
 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,

lib/libzfs/libzfs_util.c

@@ -765,6 +765,8 @@ libzfs_init(void)
 
 	libzfs_mnttab_init(hdl);
 
+    //fprintf(stderr, "make_dataset_handle %p\r\n", hdl->libzfs_log_str);
+
 	return (hdl);
 }
 
@@ -1116,6 +1118,8 @@ zfs_ioctl(libzfs_handle_t *hdl, int request, zfs_cmd_t *zc)
 {
 	int error;
 
+    //fprintf(stderr, "zc_history set to %p '%s'\r\n", hdl->libzfs_log_str,
+    //      hdl->libzfs_log_str);
 	zc->zc_history = (uint64_t)(uintptr_t)hdl->libzfs_log_str;
 	error = ioctl(hdl->libzfs_fd, request, zc);
 

module/zfs/zfs_ioctl.c

@@ -155,7 +155,7 @@ history_str_get(zfs_cmd_t *zc)
 	//Darwin requires that the third argument to copyinstr not be NULL.
 	size_t len = 0;
 
-	if (zc->zc_history == 0)
+	if (zc->zc_history == NULL)
 		return (NULL);
 
 	buf = kmem_alloc(HIS_MAX_RECORD_LEN, KM_SLEEP | KM_NODEBUG);