[pve-devel] [PATCH pve-zsync] close #1824: add 'compressed' option enabling -c and -L for send

[Fabian Ebner]

If one of the features lz4_compress, zstd_compress or large_blocks is
actively used/required by the source dataset, but not enabled on the
destination, zfs send/recv will fail and recommend upgrading the pool.

It's not required that the target dataset is also compressed.
Specifying '--properties' to have the target inherit the compression
property even works during later syncs (but pre-existing data won't be
recompressed automatically then).

Signed-off-by: Fabian Ebner <f.ebner at proxmox.com>
---

Put it near 'properties' as I felt like that was the most similar one.

 pve-zsync | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/pve-zsync b/pve-zsync
index 46b0ba7..98190b2 100755
--- a/pve-zsync
+++ b/pve-zsync
@@ -252,6 +252,7 @@ sub parse_argv {
 	source_user => undef,
 	dest_user => undef,
 	prepend_storage_id => undef,
+	compressed => undef,
 	properties => undef,
 	dest_config_path => undef,
     };
@@ -270,6 +271,7 @@ sub parse_argv {
 	'source-user=s' => \$param->{source_user},
 	'dest-user=s' => \$param->{dest_user},
 	'prepend-storage-id' => \$param->{prepend_storage_id},
+	'compressed' => \$param->{compressed},
 	'properties' => \$param->{properties},
 	'dest-config-path=s' => \$param->{dest_config_path},
     );
@@ -343,6 +345,7 @@ sub param_to_job {
     $job->{source_user} = $param->{source_user};
     $job->{dest_user} = $param->{dest_user};
     $job->{prepend_storage_id} = !!$param->{prepend_storage_id};
+    $job->{compressed} = !!$param->{compressed};
     $job->{properties} = !!$param->{properties};
     $job->{dest_config_path} = $param->{dest_config_path} if $param->{dest_config_path};
 
@@ -470,6 +473,7 @@ sub format_job {
     $text .= " --source-user $job->{source_user}";
     $text .= " --dest-user $job->{dest_user}";
     $text .= " --prepend-storage-id" if $job->{prepend_storage_id};
+    $text .= " --compressed" if $job->{compressed};
     $text .= " --properties" if $job->{properties};
     $text .= " --dest-config-path $job->{dest_config_path}" if $job->{dest_config_path};
     $text .= "\n";
@@ -1028,6 +1032,8 @@ sub send_image {
 
     push @$cmd, 'ssh', '-o', 'BatchMode=yes', "$param->{source_user}\@$source->{ip}", '--' if $source->{ip};
     push @$cmd, 'zfs', 'send';
+    push @$cmd, '-L', if $param->{compressed}; # no effect if dataset never had large recordsize
+    push @$cmd, '-c', if $param->{compressed};
     push @$cmd, '-p', if $param->{properties};
     push @$cmd, '-v' if $param->{verbose};
 
@@ -1190,6 +1196,11 @@ $PROGNAME create --dest <string> --source <string> [OPTIONS]
 	--source-user    string
 		The (ssh) user-name on the source target, root by default
 
+	--compressed
+		If specified, send data without decompressing first. If features lz4_compress,
+		zstd_compress or large_blocks are in use by the source, they need to be enabled on
+		the target as well.
+
 	--properties
 		If specified, include the dataset's properties in the stream.
 
@@ -1234,6 +1245,11 @@ $PROGNAME sync --dest <string> --source <string> [OPTIONS]\n
 	--verbose
 		If specified, print out the sync progress.
 
+	--compressed
+		If specified, send data without decompressing first. If features lz4_compress,
+		zstd_compress or large_blocks are in use by the source, they need to be enabled on
+		the target as well.
+
 	--properties
 		If specified, include the dataset's properties in the stream.
 
-- 
2.30.2