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Implement usage reporting of active encrypted swap partitions (#771670) 

GParted does not show the usage of active encrypted swap partitions,
instead showing partition warning "Unable to read the contents of this
file system! ...".  OS setup:

    # ls -l /dev/mapper/sdb4_crypt /dev/dm-3
    brw-rw----. 1 root disk 253, 3 Sep 14 07:26 /dev/dm-3
    lrwxrwxrwx. 1 root root      7 Sep 14 07:26 /dev/mapper/sdb4_crypt -> ../dm-3
    # mkswap -L encrypted_swap /dev/mapper/sdb4_crypt
    # swapon /dev/mapper/sdb4_crypt
    # cat /proc/swaps
    Filename                        Type        Size    Used    Priority
    /dev/sda2                       partition   2097148 237632  -1
    /dev/dm-3                       partition   1046524 0       -2

This is because the code was performing a string compare between the
canonical /dev/mapper/sdb4_crypt name GParted is using and the /dev/dm-3
name reported by the kernel via /proc/swaps.  Fix by creating
BlockSpecial objects from the names and compare those so that comparison
is done correctly using major, minor numbers.

Bug 771670 - Usage of active encrypted swap is not shown
This commit is contained in:
Mike Fleetwood 2016-09-14 14:18:17 +01:00 committed by Curtis Gedak
parent 3d7804576f
commit 3966cc3e6f
1 changed files with 5 additions and 4 deletions
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9
src/linux_swap.cc
View File

@ -17,6 +17,7 @@
#include "../include/linux_swap.h"
#include "../include/BlockSpecial.h"
#include "../include/Partition.h"
#include <cerrno>
@ -79,13 +80,13 @@ void linux_swap::set_used_sectors( Partition & partition )
std::ifstream input( "/proc/swaps" ) ;
if ( input )
{
Glib::ustring path = partition .get_path() ;
Glib::ustring::size_type path_len = path.length() ;
BlockSpecial bs_path = BlockSpecial( partition.get_path() );
while ( getline( input, line ) )
{
if ( line .substr( 0, path_len ) == path )
Glib::ustring filename = Utils::regexp_label( line, "^([[:graph:]]+)" );
if ( bs_path == BlockSpecial( filename ) )
{
sscanf( line.substr( path_len ).c_str(), " %*s %*d %lld", &N );
sscanf( line.c_str(), "%*s %*s %*d %lld", &N );
break ;
}
}