[gparted] Remove old workaround for btrfs resizing on Linux < 3.2 (!26)

[Curtis Gedak <gedakc src gnome org>]

commit d7dbbe497980f20f27927b7570f0c3399ee7f89f
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Mon Mar 11 14:09:51 2019 +0000

    Remove old workaround for btrfs resizing on Linux < 3.2 (!26)
    
    PATCHSET OVERVIEW
    
    The oldest supported distributions have these versions of the Linux
    kernel and btrfs-progs:
      Distro             EOL        kernel    btrfs-progs
    - RHEL / CentOS 7    2024-Jun   3.10.0    4.9.1
    - Ubuntu 14.04 LTS   2019-Apr   4.4.0     3.12
    - Debian 8           2020-Jun   3.16.0    3.17
    - SLES 12            2027-Oct   3.12.28   3.16
    
    Making the oldest supported packages be kernel 3.10 and btrfs-progs 3.12
    allows the btrfs support code to be simplified by removing backward
    compatibility.
    
    THIS CHANGE
    
    Remove old workaround for ignoring the error when resizing a btrfs to
    the same size on Linux kernel < 3.2.
    
    Also now that only exit status 0 is considered successful from btrfs
    resize, the EXEC_CHECK_STATUS flag to execute_command() can be used,
    rather than having to separately call set_status() afterwards.
    
    Relevant commit history:
    *   11d044dba0c07a5c51843beec6ff38f0c55303d8
        Don't ignore any errors resizing btrfs on Linux >= 3.2 (#669389)
    *   a580abbc30e88cb1895af342d43dcbb98183a9d5
        Use newer btrfs multi-tool control command first
    
    Closes !26 - Remove support for btrfs-progs < 3.12

 src/btrfs.cc | 30 +-----------------------------
 1 file changed, 1 insertion(+), 29 deletions(-)
---
diff --git a/src/btrfs.cc b/src/btrfs.cc
index 671311cf..de55fc7c 100644
--- a/src/btrfs.cc
+++ b/src/btrfs.cc
@@ -30,7 +30,6 @@ namespace GParted
 {
 
 bool btrfs_found = false ;
-bool resize_to_same_size_fails = true ;
 
 // Cache of required btrfs file system device information by device
 // E.g. For a single device btrfs on /dev/sda2 and a three device btrfs
@@ -136,10 +135,6 @@ FS btrfs::get_filesystem_support()
 
        fs_limits.min_size = 256 * MEBIBYTE;
 
-       //Linux before version 3.2 fails when resizing btrfs file system
-       //  to the same size.
-       resize_to_same_size_fails = ! Utils::kernel_version_at_least( 3, 2, 0 ) ;
-
        return fs ;
 }
 
@@ -347,30 +342,7 @@ bool btrfs::resize( const Partition & partition_new, OperationDetail & operation
                        cmd = "btrfs filesystem resize " + devid_str + ":" + size + " " + Glib::shell_quote( 
mount_point );
                else
                        cmd = "btrfsctl -r " + devid_str + ":" + size + " " + Glib::shell_quote( mount_point 
);
-               exit_status = execute_command( cmd, operationdetail );
-               bool resize_succeeded = ( exit_status == 0 ) ;
-               if ( resize_to_same_size_fails )
-               {
-                       //Linux before version 3.2 fails when resizing a
-                       //  btrfs file system to the same size with ioctl()
-                       //  returning -1 EINVAL (Invalid argument) from the
-                       //  kernel btrfs code.
-                       //  *   Btrfs filesystem resize reports this as exit
-                       //      status 30:
-                       //          ERROR: Unable to resize '/MOUNTPOINT'
-                       //  *   Btrfsctl -r reports this as exit status 1:
-                       //          ioctl:: Invalid argument
-                       //  WARNING:
-                       //  Ignoring these errors could mask real failures,
-                       //  but not ignoring them will cause resizing to the
-                       //  same size as part of check operation to fail.
-                       resize_succeeded = (    exit_status == 0
-                                            || (   btrfs_found && exit_status == 30 )
-                                            || ( ! btrfs_found && exit_status ==  1 )
-                                          ) ;
-               }
-               set_status( operationdetail, resize_succeeded );
-               success &= resize_succeeded ;
+               success &= ! execute_command(cmd, operationdetail, EXEC_CHECK_STATUS);
 
                if ( ! partition_new .busy )
                        success &= ! execute_command( "umount -v " + Glib::shell_quote( mount_point ),