Add linux-user-util topic branch.

This topic branch contains required changes to the user space
utilities to allow them to integrate cleanly with Linux.

.topdeps

@@ -1,3 +1 @@
-gcc-branch
+zfs-branch
-fix-branch
-feature-branch

.topmsg

@@ -1,19 +1,7 @@
 From: Brian Behlendorf <behlendorf1@llnl.gov>
-Subject: [PATCH] zfs branch
+Subject: [PATCH] linux user util
 
-Merged result of all changes which are relevant to both Solaris
+This topic branch contains required changes to the user space
-and Linux builds of the ZFS code.  These are changes where there
+utilities to allow them to integrate cleanly with Linux.
-is a reasonable chance they will be accepted upstream.
-
-Additionally, since this is effectively the root of the linux
-ZFS tree the core linux build system is added here.  This
-includes autogen.sh, configure.ac, m4 macros, some scripts/*,
-and makefiles for all the core ZFS components.  Linux-only
-features which require tweaks to the build system should appear
-on the relevant topic branches.  All autotools products which
-result from autogen.sh are commited to the linux-configure-branch.
-
-This branch also contains the META, ChangeLog, AUTHORS, TODO,
-and README, files.
 
 Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

cmd/zdb/zdb.c

@@ -2394,8 +2394,8 @@ main(int argc, char **argv)
 	}
 
 	kernel_init(FREAD);
-	g_zfs = libzfs_init();
+	if ((g_zfs = libzfs_init()) == NULL)
-	ASSERT(g_zfs != NULL);
+		return (1);
 
 	for (c = 0; c < 256; c++) {
 		if (dump_all && c != 'l' && c != 'R')

cmd/zfs/zfs_main.c

@@ -4035,17 +4035,6 @@ main(int argc, char **argv)
 
 	opterr = 0;
 
-	if ((g_zfs = libzfs_init()) == NULL) {
-		(void) fprintf(stderr, gettext("internal error: failed to "
-		    "initialize ZFS library\n"));
-		return (1);
-	}
-
-	zpool_set_history_str("zfs", argc, argv, history_str);
-	verify(zpool_stage_history(g_zfs, history_str) == 0);
-
-	libzfs_print_on_error(g_zfs, B_TRUE);
-
 	if ((mnttab_file = fopen(MNTTAB, "r")) == NULL) {
 		(void) fprintf(stderr, gettext("internal error: unable to "
 		    "open %s\n"), MNTTAB);
@@ -4087,9 +4076,18 @@ main(int argc, char **argv)
 		/*
 		 * Special case '-?'
 		 */
-		if (strcmp(cmdname, "-?") == 0)
+		if ((strcmp(cmdname, "-?") == 0) ||
+		    (strcmp(cmdname, "--help") == 0))
 			usage(B_TRUE);
 
+		if ((g_zfs = libzfs_init()) == NULL)
+			return (1);
+
+		zpool_set_history_str("zfs", argc, argv, history_str);
+		verify(zpool_stage_history(g_zfs, history_str) == 0);
+
+		libzfs_print_on_error(g_zfs, B_TRUE);
+
 		/*
 		 * 'volinit' and 'volfini' do not appear in the usage message,
 		 * so we have to special case them here.

cmd/zinject/zinject.c

@@ -486,19 +486,6 @@ main(int argc, char **argv)
 	int ret;
 	int flags = 0;
 
-	if ((g_zfs = libzfs_init()) == NULL) {
-		(void) fprintf(stderr, "internal error: failed to "
-		    "initialize ZFS library\n");
-		return (1);
-	}
-
-	libzfs_print_on_error(g_zfs, B_TRUE);
-
-	if ((zfs_fd = open(ZFS_DEV, O_RDWR)) < 0) {
-		(void) fprintf(stderr, "failed to open ZFS device\n");
-		return (1);
-	}
-
 	if (argc == 1) {
 		/*
 		 * No arguments.  Print the available handlers.  If there are no
@@ -612,6 +599,16 @@ main(int argc, char **argv)
 	argc -= optind;
 	argv += optind;
 
+	if ((g_zfs = libzfs_init()) == NULL)
+		return (1);
+
+	libzfs_print_on_error(g_zfs, B_TRUE);
+
+	if ((zfs_fd = open(ZFS_DEV, O_RDWR)) < 0) {
+		(void) fprintf(stderr, "failed to open ZFS device\n");
+		return (1);
+	}
+
 	if (cancel != NULL) {
 		/*
 		 * '-c' is invalid with any other options.

cmd/zpool/zpool_main.c

@@ -3921,14 +3921,6 @@ main(int argc, char **argv)
 	(void) setlocale(LC_ALL, "");
 	(void) textdomain(TEXT_DOMAIN);
 
-	if ((g_zfs = libzfs_init()) == NULL) {
-		(void) fprintf(stderr, gettext("internal error: failed to "
-		    "initialize ZFS library\n"));
-		return (1);
-	}
-
-	libzfs_print_on_error(g_zfs, B_TRUE);
-
 	opterr = 0;
 
 	/*
@@ -3944,9 +3936,15 @@ main(int argc, char **argv)
 	/*
 	 * Special case '-?'
 	 */
-	if (strcmp(cmdname, "-?") == 0)
+	if ((strcmp(cmdname, "-?") == 0) ||
+	     strcmp(cmdname, "--help") == 0)
 		usage(B_TRUE);
 
+	if ((g_zfs = libzfs_init()) == NULL)
+		return (1);
+
+	libzfs_print_on_error(g_zfs, B_TRUE);
+
 	zpool_set_history_str("zpool", argc, argv, history_str);
 	verify(zpool_stage_history(g_zfs, history_str) == 0);
 

lib/libzfs/libzfs_sendrecv.c

@@ -39,6 +39,7 @@
 #include <sys/mntent.h>
 #include <sys/mnttab.h>
 #include <sys/avl.h>
+#include <sys/debug.h>
 #include <stddef.h>
 
 #include <libzfs.h>

lib/libzfs/libzfs_util.c

@@ -578,6 +578,13 @@ libzfs_init(void)
 	}
 
 	if ((hdl->libzfs_fd = open(ZFS_DEV, O_RDWR)) < 0) {
+		(void) fprintf(stderr, gettext("Unable to open %s: %s.\n"),
+			       ZFS_DEV, strerror(errno));
+		if (errno == ENOENT)
+			(void) fprintf(stderr,
+			     gettext("Verify the ZFS module stack is "
+			     "loaded by running '/sbin/modprobe zfs'.\n"));
+
 		free(hdl);
 		return (NULL);
 	}