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From f98f791e19669b900345dad7d96ea4df974e4596 Mon Sep 17 00:00:00 2001
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From: "Brian C. Lane" <bcl@redhat.com>
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Date: Wed, 4 Feb 2015 16:46:07 -0800
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Subject: [PATCH 10/11] libparted: device mapper uses 512b sectors
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device mapper doesn't use the device's sector size when creating a
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table. It always uses 512b units. This causes partitions to be created
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8x smaller than expected on devices with 4906b sectors.
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---
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NEWS | 4 ++++
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libparted/arch/linux.c | 21 +++++++++++++++++----
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2 files changed, 21 insertions(+), 4 deletions(-)
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diff --git a/NEWS b/NEWS
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index 10c9a6e..96135ed 100644
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--- a/NEWS
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+++ b/NEWS
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@@ -4,6 +4,10 @@ GNU parted NEWS -*- outline -*-
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** Bug Fixes
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+ Use 512b sector size when communicating with device-mapper. Fixes
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+ problems with partitions being created too small on dm devices
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+ with sector sizes > 5121b
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+
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Don't crash in the disk_set command when a disk label is not found
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libparted-fs-resize: Prevent crash resizing FAT16 file systems.
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diff --git a/libparted/arch/linux.c b/libparted/arch/linux.c
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index 0f18904..90ab21d 100644
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--- a/libparted/arch/linux.c
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+++ b/libparted/arch/linux.c
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@@ -2763,6 +2763,12 @@ _dm_get_partition_start_and_length(PedPartition const *part,
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if (sscanf (params, "%d:%d %Ld", &major, &minor, start) != 3)
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goto err;
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rc = 1;
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+
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+ /* device-mapper uses 512b units, make sure we return length and start in terms of the device's
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+ * sector size.
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+ */
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+ *start /= (part->disk->dev->sector_size / PED_SECTOR_SIZE_DEFAULT);
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+ *length /= (part->disk->dev->sector_size / PED_SECTOR_SIZE_DEFAULT);
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err:
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free (path);
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dm_task_destroy(task);
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@@ -2810,8 +2816,10 @@ _dm_add_partition (PedDisk* disk, const PedPartition* part)
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/* Caution: dm_task_destroy frees dev_name. */
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dm_task_destroy (task);
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task = NULL;
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+ /* device-mapper uses 512b units, not the device's sector size */
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if ( ! (params = zasprintf ("%d:%d %lld", arch_specific->major,
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- arch_specific->minor, part->geom.start)))
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+ arch_specific->minor,
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+ part->geom.start * (disk->dev->sector_size / PED_SECTOR_SIZE_DEFAULT))))
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goto err;
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task = dm_task_create (DM_DEVICE_CREATE);
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@@ -2821,7 +2829,8 @@ _dm_add_partition (PedDisk* disk, const PedPartition* part)
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dm_task_set_name (task, vol_name);
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if (vol_uuid)
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dm_task_set_uuid (task, vol_uuid);
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- dm_task_add_target (task, 0, part->geom.length,
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+ /* device-mapper uses 512b units, not the device's sector size */
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+ dm_task_add_target (task, 0, part->geom.length * (disk->dev->sector_size / PED_SECTOR_SIZE_DEFAULT),
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"linear", params);
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if (!dm_task_set_cookie (task, &cookie, 0))
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goto err;
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@@ -2878,8 +2887,11 @@ _dm_resize_partition (PedDisk* disk, const PedPartition* part)
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/* Caution: dm_task_destroy frees dev_name. */
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dm_task_destroy (task);
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task = NULL;
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+
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+ /* device-mapper uses 512b units, not the device's sector size */
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if ( ! (params = zasprintf ("%d:%d %lld", arch_specific->major,
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- arch_specific->minor, part->geom.start)))
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+ arch_specific->minor,
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+ part->geom.start * (disk->dev->sector_size / PED_SECTOR_SIZE_DEFAULT))))
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goto err;
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task = dm_task_create (DM_DEVICE_RELOAD);
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@@ -2887,7 +2899,8 @@ _dm_resize_partition (PedDisk* disk, const PedPartition* part)
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goto err;
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dm_task_set_name (task, vol_name);
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- dm_task_add_target (task, 0, part->geom.length,
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+ /* device-mapper uses 512b units, not the device's sector size */
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+ dm_task_add_target (task, 0, part->geom.length * (disk->dev->sector_size / PED_SECTOR_SIZE_DEFAULT),
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"linear", params);
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if (!dm_task_set_cookie (task, &cookie, 0))
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goto err;
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--
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2.1.0
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