Initialize for btrfsprogs

btrfs-progs_props_dont_translate_value_of_compression_none.patch

@@ -0,0 +1,123 @@
+From 7781d1a2daa6564c3988dc268eb0680e057027f5 Mon Sep 17 00:00:00 2001
+From: Li Zhang <zhanglikernel@gmail.com>
+Date: Sun, 16 Jan 2022 16:52:43 +0800
+Subject: [PATCH] btrfs-progs: props: don't translate value of compression=none
+References: JSC#PED-1711
+
+Currently, if user specifies value 'no' or 'none' on the command line,
+it gets translated to an empty value that is passed to kernel. There was
+a change in kernel 5.14 done by commit 5548c8c6f55b ("btrfs: props:
+change how empty value is interpreted") that changes the behaviour
+in that case.
+
+The empty value is supposed to mean 'the default value' for any
+property. For compression there is a need to distinguish resetting the
+value and also setting the NOCOMPRESS property. The translation to empty
+value makes that impossible.
+
+The explanation and behaviour copied from the kernel patch:
+
+    Old behaviour:
+
+      $ lsattr file
+      ---------------------- file
+      # the NOCOMPRESS bit is set
+      $ btrfs prop set file compression ''
+      $ lsattr file
+      ---------------------m file
+
+    This is equivalent to 'btrfs prop set file compression no' in current
+    btrfs-progs as the 'no' or 'none' values are translated to an empty
+    string.
+
+    This is where the new behaviour is different: empty string drops the
+    compression flag (-c) and nocompress (-m):
+
+      $ lsattr file
+      ---------------------- file
+      # No change
+      $ btrfs prop set file compression ''
+      $ lsattr file
+      ---------------------- file
+      $ btrfs prop set file compression lzo
+      $ lsattr file
+      --------c------------- file
+      $ btrfs prop get file compression
+      compression=lzo
+      $ btrfs prop set file compression ''
+      # Reset to the initial state
+      $ lsattr file
+      ---------------------- file
+      # Set NOCOMPRESS bit
+      $ btrfs prop set file compression no
+      $ lsattr file
+      ---------------------m file
+
+    This obviously brings problems with backward compatibility, so this
+    patch should not be backported without making sure the updated
+    btrfs-progs are also used and that scripts have been updated to use the
+    new semantics.
+
+    Summary:
+
+    - old kernel:
+      no, none, "" - set NOCOMPRESS bit
+    - new kernel:
+      no, none - set NOCOMPRESS bit
+      "" - drop all compression flags, ie. COMPRESS and NOCOMPRESS
+
+Signed-off-by: Li Zhang <zhanglikernel@gmail.com>
+[ update changelog ]
+Signed-off-by: David Sterba <dsterba@suse.com>
+
+---
+ Documentation/btrfs-property.8        |   11 +++++++++--
+ Documentation/btrfs-property.asciidoc |    3 ++-
+ cmds/property.c                       |    2 --
+ 3 files changed, 11 insertions(+), 5 deletions(-)
+
+--- a/Documentation/btrfs-property.8
++++ b/Documentation/btrfs-property.8
+@@ -82,10 +82,17 @@
+ compression algorithm set for an inode, possible values:
+ \fIlzo\fR,
+ \fIzlib\fR,
+-\fIzstd\fR\&. To disable compression use "" (empty string),
++\fIzstd\fR\&. To disable compression use
+ \fIno\fR
+ or
+-\fInone\fR\&.
++\fInone\fR\&. Empty value resets the property and sets a default value.
++.br
++.PP
++.ps +1
++\fBNote\fR
++.ps -1
++.br
++An empty value resetting compression property has changed since kernel 5.14. Earlier versions would disable compression.
+ .RE
+ .RE
+ .PP
+--- a/Documentation/btrfs-property.asciidoc
++++ b/Documentation/btrfs-property.asciidoc
+@@ -47,7 +47,8 @@
+ device as object. For a mounted filesystem, specify a mount point.
+ compression::::
+ compression algorithm set for an inode, possible values: 'lzo', 'zlib', 'zstd'.
+-To disable compression use "" (empty string), 'no' or 'none'.
++To disable compression use 'no' or 'none'. An empty string "" resets the property and sets a default value.
++'Note:' An empty value resetting compression property has changed since kernel 5.14. Earlier versions would disable compression.
+ 
+ *list* [-t <type>] <object>::
+ Lists available properties with their descriptions for the given object.
+--- a/cmds/property.c
++++ b/cmds/property.c
+@@ -126,8 +126,6 @@
+ 	xattr_name[XATTR_BTRFS_PREFIX_LEN + strlen(name)] = '\0';
+ 
+ 	if (value) {
+-		if (strcmp(value, "no") == 0 || strcmp(value, "none") == 0)
+-			value = "";
+ 		sret = fsetxattr(fd, xattr_name, value, strlen(value), 0);
+ 	} else {
+ 		sret = fgetxattr(fd, xattr_name, NULL, 0);