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https://gitlab.gnome.org/GNOME/gparted
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571304d2c6
GParted is already reading /proc/partitions to get whole disk device
names. The file also contains the major, minor device number of every
partition. Use this information to pre-populate the cache in the
BlockSpecial class.
# cat /proc/partitions
major minor #blocks name
8 0 20971520 sda
8 1 512000 sda1
8 2 20458496 sda2
...
9 3 1047552 md3
259 2 262144 md3p1
259 3 262144 md3p2
...
253 0 18317312 dm-0
253 1 2097152 dm-1
253 2 8383872 dm-2
253 3 1048576 dm-3
Note that for Device-Mapper names (dm-*) the kernel is not using the
canonical user space names (mapper/*). There is no harm in
pre-populating the cache with these names and will help if tools report
them too. It is just that for DMRaid, LVM and LUKS, GParted uses the
canonical /dev/mapper/* names so will still have to call stat() once for
each such name.
For plain disks (sd*) and Linux Software RAID arrays (md*) the kernel
name is the common user space name too, therefore matches what GParted
uses and pre-populating does avoid calling stat() at all for these
names.
Bug 767842 - File system usage missing when tools report alternate block
device names
60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
/* Copyright (C) 2016 Mike Fleetwood
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/* BlockSpecial
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*
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* Representation of a POSIX block special file, e.g. /dev/sda1. Also
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* tracks the major, minor device numbers so that different names for
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* the same block device can be compared equal.
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* Refs: mknod(1) and mknod(2).
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*/
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#ifndef GPARTED_BLOCKSPECIAL_H
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#define GPARTED_BLOCKSPECIAL_H
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#include <glibmm/ustring.h>
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namespace GParted
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{
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class BlockSpecial
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{
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public:
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BlockSpecial();
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BlockSpecial( const Glib::ustring & name );
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~BlockSpecial();
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Glib::ustring m_name; // E.g. Block special file {"/dev/sda1", 8, 1},
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unsigned long m_major; // plain file {"FILENAME", 0, 0} and empty object
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unsigned long m_minor; // {"", 0, 0}.
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static void clear_cache();
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static void register_block_special( const Glib::ustring & name,
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unsigned long major, unsigned long minor );
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};
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// Operator overloading > The Decision between Member and Non-member
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// http://stackoverflow.com/questions/4421706/operator-overloading/4421729#4421729
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// "2. If a binary operator treats both operands equally (it leaves them unchanged),
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// implement this operator as a non-member function."
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bool operator==( const BlockSpecial & lhs, const BlockSpecial & rhs );
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bool operator<( const BlockSpecial & lhs, const BlockSpecial & rhs );
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}//GParted
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#endif /* GPARTED_BLOCKSPECIAL_H */
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