Implement remove() method so that the LVM2 metadata is updated to
reflect the removal of the LVM2 Physical Volume as well as removing the
signature from the PV before the partition is deleted or overwritten.
lvm pvremove /dev/DEVICE
Also specifically force the removal of the PV when it is a member of a
Volume Group so that it will succeed.
RATIONAL:
If the PV was not removed before the partition was deleted or
overwritten, LVM2 would be left in a broken state with metadata
describing missing PVs for any partially deleted VGs. This leaves the
user needing to perform recovery of a lost PV, which required in depth
understanding of LVM2 and is beyond the scope of what GParted can
currently provide.
The alternative is to use the pvremove command to instruct LVM2 to
remove the PV and update LVM2 metadata to reflect the removal of the PV.
For PVs which are a member of a VG this includes forcing the removal.
This has the impact of making recovery from accidental deletion of a
partition containing a PV irrecoverable. GParted is not able to recover
this situation anyway because Device -> Attempt Data Rescue, using the
gpart command, is not able to detect the signature of an LVM2 PV.
Choose to remove the PV, forcibly if required, rather than potentially
leave LVM2 with missing PVs.
Bug #670171 - Add LVM PV read-write support
This commit only adds a remove() method to every file system and an
optional call to it in the relevant operations. All remove() methods
are no operations and not enabled.
The remove() method provides explicit controlled removal of a file
system before the partition is deleted or overwritten by being formatted
or pasted into. When implemented, it appears as an extra step in the
relevant operation. The file system specific remove() method is
explicitly allowed to fail and stop the operations currently being
applied.
This is different to the existing erase_filesystem_signatures() which
wipes any previous file system signatures immediately before a new file
system is written to ensure there is no possibility of the partition
containing two or more different file system signatures. It never fails
or reports anything to the user.
NOTE:
Most file systems should NOT implement a remove() method as it will
prevent recovery from accidental partition deletion.
Bug #670171 - Add LVM PV read-write support
Copy operation for LVM2 Physical Volumes is deliberately not implemented
because it doesn't fit with how LVM2 works and is not safe in the
general case without an understanding of its internals. See comment in
lvm2_pv::copy() for more details.
Bug #670171 - Add LVM PV read-write support
In the Partition menu enable activation / deactivation of the LVM2
Volume Group of which the Physical Volume is a member.
Bug #670171 - Add LVM PV read-write support
Add creation of Physical Volumes specifying LVM2 metatdata format:
lvm pvcreate -M 2 /dev/DEVICE
Also set the partition type to identify its contents as LVM. Note that
libparted treats every partition type as a file system except LVM which
it treats as a flag, hence GParted displaying "lvm" in the Manage Flags
dialog. Never the less libparted set the partition types correctly.
For MBR partitioning the type is 8e "Linux LVM" and for GPT partitioning
the type is E6D6D379-F507-44C2-A23C-238F2A3DF928. Setting the partition
type as LVM is not strictly required as LVM2 scans the contents of all
partitions looking for PVs, but it is best practice.
Bug #670171 - Add LVM PV read-write support
Steps to reproduce:
1) Open any of these dialogs: Create New Partition, Resize/Move or
Paste;
2) Update any of the following numeric entry fields to a different value
using the keyboard: Free space preceding, New size or Free space
following;
3) Press [Esc] key;
Gparted crashes.
What is happening is that the [Esc] key is leading to the dialog being
closed and calling the ~Dialog_Base_Partition() destructor. However
after this the GTK widget is calling the on_spinbutton_value_change()
registered callbacks for the change to the other two values, on the now
just deleted object.
Fix by disconnecting the change notification callbacks in the
destructor.
Closes bug #682658 - GParted crash by pressing Esc in dialogs with
number entry
The mount of lost file systems that were larger than a 32 bit integer
could hold (~2 GiB), or started after the first ~2 GiB of disk, would
fail.
Closes Bug #680740 - Gparted fails when mounting the read-only view of
lost filesystems
The member functions btrfs_size_to_num(), btrfs_size_max_delta() and
btrfs_size_to_gdouble() don't access any member variables. Therefore
they don't need the const qualifier allowing them to be called when the
btrfs object is const for read-only access to member variables, but
instead need to be static member functions with no access to member
variables.
When resizing an extended partition, a problem can occur with MiB
alignment wherein the requested end sector could be less than the end
sector of the last logical partition. This would be an invalid
geometry because all the logical partitions must be wholly contained
within the extended partition.
Check for this situation and if found then set requested end for
the extended partition to the end of the last logical partition.
Closes Bug #678831 - Partition End Overlap when Resizing Extended
Partition
Restore intended logic accidentally changed by my recent commit:
Simplify calc_usage_triple() interface and rename
6c96ab34b3
Set each display integer to zero if the associated usage value is
negative, rather than setting 100% unused for unknown usage. Graphical
display of partition usage for unknown and unsupported file system types
is not affected and continues to be all white because of the logic in
the callers.
Local variables used, unused and unallocated were hiding class member
variables of the same name. Remove first two local variables as they
were only accessed once and rename third.
Now that every call to calc_usage_triple() just passes usage figures
returned by get_sectors_*(), remove those parameters, call
get_sectors_*() internally and rename to get_usage_triple().
Stop using fraction_unallocated and fraction_used member variables of
the DrawingAreaVisualDisk class as intermediate storage of partition
usage fractions. Instead get the figures straight from the partition
class and use the new calc_usage_triple() to directly set pixels widths
for the partition usage graphic.
For specific partition usage values the right hand border of the
partition graphic in the Information dialog would be displayed as grey
rather than the color assigned to the partition.
Steps to reproduce fault:
Create 1024 MiB partition
# lvm pvcreate /dev/sda12
# lvm vgcreate GParted-VG1 /dev/sda12
View partition information
Fragment from Dialog_Partition_Info::init_drawingarea():
139 else if ( partition .sector_usage_known() )
140 {
141 used = Utils::round( ( 400 - BORDER *2 ) / ( dlength / partition .get_sectors_used() ) ) ;
142 unused = Utils::round( ( 400 - BORDER *2 ) / ( dlength / partition .get_sectors_unused() ) ) ;
143 unallocated = 400 - BORDER *2 - used - unused ;
144 }
For this issue the above values are both exactly x.5 and both round
upwards, resulting in unallocated being -1.
used = round((400 - 8*2)/(2097152.0/8192)) = round(1.5)
unused = round((400 - 8*2)/(2097152.0/2088960)) = round(382.5)
unallocated = 400 - 8*2 - 2 - 383 = -1
The simple fix would be to use floor() instead of round() in the
calculation of either used or unused. The same fix would also need to
be applied in Display_Info() for the calculation of the percentage
figures. Unfortunately this simple fix can lead to odd figures when the
used or unused is close to zero and floor() or ceil() is effectively
applied rather than round(). For example:
Size: 227.23 GiB
Used: 28.00 KiB ( 1% )
Unused: 180.00 GiB ( 79% )
Unallocated: 47.23 GiB ( 20% )
Used figure of 28 KiB in 227 GiB partition should be rounded to 0% but
wasn't.
Write Partition::calc_usage_triple() which calculates the "best" figures
by rounding the smaller two figures and subtracts them from the desired
total for the largest figure. Apply to the calculation of the partition
usage percentage figures in the Information dialog and the partition
usage graphic in the same dialog and the main window.
Bug #499202 - gparted does not see the difference if partition size
differs from filesystem size
Most file systems report intrinsic unallocated space using the statvfs()
system call when mounted, but not using their own tools. They are:
ext2/3/4, fat16/32, hfs, nilfs2, reiserfs and xfs. Showing either a
little or no unallocated space, depending on whether a file system is
mounted or not, could be confusing to the user.
When all file systems are created filling their partitions the unused
figure reported by statvfs() and their own tools are the same or very
close. Also the used plus unallocated figure from statvfs() agrees with
the used figure from their own tools.
For all file systems don't display intrinsic unallocated space (that
below the threshold of 2 to 5%), instead include it as used space. As
soon as the amount of unallocated space becomes significant display it
everywhere and also trigger the warning.
For display purposes always use the new Partition methods:
get_sectors_used(), get_sectors_unused(), and get_sectors_unallocated().
When calculating new usage figures during Paste and Resize/Move
operations directly access sectors_used, sectors_unused and
sectors_unallocated members.
Bug #499202 - gparted does not see the difference if partition size
differs from filesystem size
Mike Fleetwood