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Date:      Thu, 22 Feb 2018 04:01:05 +0000 (UTC)
From:      Alexander Motin <mav@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-vendor@freebsd.org
Subject:   svn commit: r329807 - vendor/illumos/dist/lib/libzfs/common
Message-ID:  <201802220401.w1M415FS016388@repo.freebsd.org>
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Author: mav
Date: Thu Feb 22 04:01:05 2018
New Revision: 329807
URL: https://svnweb.freebsd.org/changeset/base/329807

Log:
  8940 Sending an intra-pool resumable send stream may result in EXDEV
  
  illumos/illumos-gate@544132fce3fa6583f01318f9559adc46614343a7
  
  "zfs send -t <token>" for an incremental send should be able to resume
  successfully when sending to the same pool: a subtle issue in
  zfs_iter_children() doesn't currently allow this.
  
  Because resuming from a token requires "guid" -> "dataset" mapping
  (guid_to_name()), we have to walk the whole hierarchy to find the right
  snapshots to send.
  When resuming an incremental send both source and destination live in the
  same pool and have the same guid: this is where zfs_iter_children() gets
  confused and picks up the wrong snapshot, so we end up trying to send an
  incremental "destination@snap1 -> source@snap2" stream instead of
  "source@snap1 -> source@snap2": this fails with an "Invalid cross-device
  link" (EXDEV) error.
  
  Reviewed by: Paul Dagnelie <pcd@delphix.com>
  Reviewed by: Matthew Ahrens <mahrens@delphix.com>
  Approved by: Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
  Author: loli10K <ezomori.nozomu@gmail.com>

Modified:
  vendor/illumos/dist/lib/libzfs/common/libzfs_iter.c
  vendor/illumos/dist/lib/libzfs/common/libzfs_sendrecv.c

Modified: vendor/illumos/dist/lib/libzfs/common/libzfs_iter.c
==============================================================================
--- vendor/illumos/dist/lib/libzfs/common/libzfs_iter.c	Thu Feb 22 03:55:02 2018	(r329806)
+++ vendor/illumos/dist/lib/libzfs/common/libzfs_iter.c	Thu Feb 22 04:01:05 2018	(r329807)
@@ -424,16 +424,20 @@ zfs_iter_snapspec(zfs_handle_t *fs_zhp, const char *sp
 
 /*
  * Iterate over all children, snapshots and filesystems
+ * Process snapshots before filesystems because they are nearer the input
+ * handle: this is extremely important when used with zfs_iter_f functions
+ * looking for data, following the logic that we would like to find it as soon
+ * and as close as possible.
  */
 int
 zfs_iter_children(zfs_handle_t *zhp, zfs_iter_f func, void *data)
 {
 	int ret;
 
-	if ((ret = zfs_iter_filesystems(zhp, func, data)) != 0)
+	if ((ret = zfs_iter_snapshots(zhp, B_FALSE, func, data)) != 0)
 		return (ret);
 
-	return (zfs_iter_snapshots(zhp, B_FALSE, func, data));
+	return (zfs_iter_filesystems(zhp, func, data));
 }
 
 

Modified: vendor/illumos/dist/lib/libzfs/common/libzfs_sendrecv.c
==============================================================================
--- vendor/illumos/dist/lib/libzfs/common/libzfs_sendrecv.c	Thu Feb 22 03:55:02 2018	(r329806)
+++ vendor/illumos/dist/lib/libzfs/common/libzfs_sendrecv.c	Thu Feb 22 04:01:05 2018	(r329807)
@@ -1577,6 +1577,7 @@ zfs_send_resume(libzfs_handle_t *hdl, sendflags_t *fla
 	int error = 0;
 	char name[ZFS_MAX_DATASET_NAME_LEN];
 	enum lzc_send_flags lzc_flags = 0;
+	FILE *fout = (flags->verbose && flags->dryrun) ? stdout : stderr;
 
 	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
 	    "cannot resume send"));
@@ -1591,9 +1592,9 @@ zfs_send_resume(libzfs_handle_t *hdl, sendflags_t *fla
 		return (zfs_error(hdl, EZFS_FAULT, errbuf));
 	}
 	if (flags->verbose) {
-		(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
+		(void) fprintf(fout, dgettext(TEXT_DOMAIN,
 		    "resume token contents:\n"));
-		nvlist_print(stderr, resume_nvl);
+		nvlist_print(fout, resume_nvl);
 	}
 
 	if (nvlist_lookup_string(resume_nvl, "toname", &toname) != 0 ||
@@ -1650,7 +1651,7 @@ zfs_send_resume(libzfs_handle_t *hdl, sendflags_t *fla
 		    lzc_flags, &size);
 		if (error == 0)
 			size = MAX(0, (int64_t)(size - bytes));
-		send_print_verbose(stderr, zhp->zfs_name, fromname,
+		send_print_verbose(fout, zhp->zfs_name, fromname,
 		    size, flags->parsable);
 	}

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