13025 Port OpenZFS: Add support for boot environment data to be stored in the label

Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Toomas Soome <tsoome@me.com>
Reviewed by: C Fraire <cfraire@me.com>
Reviewed by: Andy Fiddaman <andy@omniosce.org>
Approved by: Dan McDonald <danmcd@joyent.com>

6 files changed, 75 insertions, 4 deletions

diff --git a/usr/src/lib/libzfs/common/libzfs.h b/usr/src/lib/libzfs/common/libzfs.h
index edfe2454e5..c798bd15ca 100644
--- a/usr/src/lib/libzfs/common/libzfs.h
+++ b/usr/src/lib/libzfs/common/libzfs.h
@@ -821,6 +821,8 @@ extern int zpool_in_use(libzfs_handle_t *, int, pool_state_t *, char **,
  * Label manipulation.
  */
 extern int zpool_clear_label(int);
+extern int zpool_set_bootenv(zpool_handle_t *, const char *);
+extern int zpool_get_bootenv(zpool_handle_t *, char *, size_t, off_t);
 
 /* is this zvol valid for use as a dump device? */
 extern int zvol_check_dump_config(char *);
diff --git a/usr/src/lib/libzfs/common/libzfs_pool.c b/usr/src/lib/libzfs/common/libzfs_pool.c
index d2b4b54294..c751b95484 100644
--- a/usr/src/lib/libzfs/common/libzfs_pool.c
+++ b/usr/src/lib/libzfs/common/libzfs_pool.c
@@ -21,7 +21,7 @@
 
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2011, 2017 by Delphix. All rights reserved.
+ * Copyright (c) 2011, 2020 by Delphix. All rights reserved.
  * Copyright 2019 Joyent, Inc.
  * Copyright 2016 Nexenta Systems, Inc.
  * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
@@ -396,7 +396,7 @@ zpool_get_prop(zpool_handle_t *zhp, zpool_prop_t prop, char *buf, size_t len,
  * Assuming bootfs is a valid dataset name.
  */
 static boolean_t
-bootfs_name_valid(const char *pool, char *bootfs)
+bootfs_name_valid(const char *pool, const char *bootfs)
 {
 	int len = strlen(pool);
 	if (bootfs[0] == '\0')
@@ -4410,6 +4410,42 @@ zpool_obj_to_path(zpool_handle_t *zhp, uint64_t dsobj, uint64_t obj,
 	free(mntpnt);
 }
 
+int
+zpool_set_bootenv(zpool_handle_t *zhp, const char *envmap)
+{
+	int error = lzc_set_bootenv(zhp->zpool_name, envmap);
+	if (error != 0) {
+		(void) zpool_standard_error_fmt(zhp->zpool_hdl, error,
+		    dgettext(TEXT_DOMAIN,
+		    "error setting bootenv in pool '%s'"), zhp->zpool_name);
+	}
+
+	return (error);
+}
+
+int
+zpool_get_bootenv(zpool_handle_t *zhp, char *outbuf, size_t size, off_t offset)
+{
+	nvlist_t *nvl;
+	int error = lzc_get_bootenv(zhp->zpool_name, &nvl);
+	if (error != 0) {
+		(void) zpool_standard_error_fmt(zhp->zpool_hdl, error,
+		    dgettext(TEXT_DOMAIN,
+		    "error getting bootenv in pool '%s'"), zhp->zpool_name);
+		return (-1);
+	}
+	char *envmap = fnvlist_lookup_string(nvl, "envmap");
+	if (offset >= strlen(envmap)) {
+		fnvlist_free(nvl);
+		return (0);
+	}
+
+	strlcpy(outbuf, envmap + offset, size);
+	int bytes = MIN(strlen(envmap + offset), size);
+	fnvlist_free(nvl);
+	return (bytes);
+}
+
 /*
  * Read the EFI label from the config, if a label does not exist then
  * pass back the error to the caller. If the caller has passed a non-NULL
diff --git a/usr/src/lib/libzfs/common/mapfile-vers b/usr/src/lib/libzfs/common/mapfile-vers
index 49fc94a536..0083c052df 100644
--- a/usr/src/lib/libzfs/common/mapfile-vers
+++ b/usr/src/lib/libzfs/common/mapfile-vers
@@ -202,6 +202,7 @@ SYMBOL_VERSION SUNWprivate_1.1 {
 	zpool_find_vdev;
 	zpool_find_vdev_by_physpath;
 	zpool_fru_set;
+	zpool_get_bootenv;
 	zpool_get_config;
 	zpool_get_errlog;
 	zpool_get_features;
@@ -241,6 +242,7 @@ SYMBOL_VERSION SUNWprivate_1.1 {
 	zpool_reguid;
 	zpool_reopen;
 	zpool_scan;
+	zpool_set_bootenv;
 	zpool_set_prop;
 	zpool_skip_pool;
 	zpool_state_to_name;
diff --git a/usr/src/lib/libzfs_core/common/libzfs_core.c b/usr/src/lib/libzfs_core/common/libzfs_core.c
index 82d992f469..8b094fbd6a 100644
--- a/usr/src/lib/libzfs_core/common/libzfs_core.c
+++ b/usr/src/lib/libzfs_core/common/libzfs_core.c
@@ -20,7 +20,7 @@
  */
 
 /*
- * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2020 by Delphix. All rights reserved.
  * Copyright (c) 2013 Steven Hartland. All rights reserved.
  * Copyright (c) 2014 Integros [integros.com]
  * Copyright 2017 RackTop Systems.
@@ -1354,3 +1354,25 @@ lzc_change_key(const char *fsname, uint64_t crypt_cmd, nvlist_t *props,
 	nvlist_free(ioc_args);
 	return (error);
 }
+
+/*
+ * Set the bootenv contents for the given pool.
+ */
+int
+lzc_set_bootenv(const char *pool, const char *env)
+{
+	nvlist_t *args = fnvlist_alloc();
+	fnvlist_add_string(args, "envmap", env);
+	int error = lzc_ioctl(ZFS_IOC_SET_BOOTENV, pool, args, NULL);
+	fnvlist_free(args);
+	return (error);
+}
+
+/*
+ * Get the contents of the bootenv of the given pool.
+ */
+int
+lzc_get_bootenv(const char *pool, nvlist_t **outnvl)
+{
+	return (lzc_ioctl(ZFS_IOC_GET_BOOTENV, pool, NULL, outnvl));
+}
diff --git a/usr/src/lib/libzfs_core/common/libzfs_core.h b/usr/src/lib/libzfs_core/common/libzfs_core.h
index 9b7721e7eb..f5a04b0762 100644
--- a/usr/src/lib/libzfs_core/common/libzfs_core.h
+++ b/usr/src/lib/libzfs_core/common/libzfs_core.h
@@ -20,7 +20,7 @@
  */
 
 /*
- * Copyright (c) 2012, 2016 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2020 by Delphix. All rights reserved.
  * Copyright (c) 2014 Integros [integros.com]
  * Copyright 2017 RackTop Systems.
  * Copyright (c) 2017 Datto Inc.
@@ -118,6 +118,8 @@ int lzc_channel_program_nosync(const char *, const char *, uint64_t,
 int lzc_pool_checkpoint(const char *);
 int lzc_pool_checkpoint_discard(const char *);
 
+int lzc_set_bootenv(const char *, const char *);
+int lzc_get_bootenv(const char *, nvlist_t **);
 #ifdef	__cplusplus
 }
 #endif
diff --git a/usr/src/lib/libzfs_core/common/mapfile-vers b/usr/src/lib/libzfs_core/common/mapfile-vers
index 98516b66cc..bc4bc3631d 100644
--- a/usr/src/lib/libzfs_core/common/mapfile-vers
+++ b/usr/src/lib/libzfs_core/common/mapfile-vers
@@ -38,6 +38,13 @@
 
 $mapfile_version 2
 
+SYMBOL_VERSION ILLUMOS_0.8 {
+	global:
+
+	lzc_get_bootenv;
+	lzc_set_bootenv;
+} ILLUMOS_0.7;
+
 SYMBOL_VERSION ILLUMOS_0.7 {
 	global: