From eb927155680f75e570dc7375514e344a936a3fb5 Mon Sep 17 00:00:00 2001
From: "Brian C. Lane" <bcl@redhat.com>
Date: Mon, 1 May 2017 17:05:01 -0700
Subject: [PATCH 70/75] Add support for RAM drives

Recognize RAM drives, so "parted -s /dev/ram0 p" now prints
"RAM Drive (brd)" instead of "Model: Unknown (unknown)".

In order for a device to be recognized as RAM drive, it has to
have major number 1. Also the BLKFLSBUF ioctl shouldn't be used
on RAM drives as it is used to zero the device.

* NEWS: Mention the change
* include/parted/device.h.in(PedDeviceType): Add PED_DEVICE_RAM.
* libparted/arch/linux.c(RAM_MAJOR): New define.
* libparted/arch/linux.c(_device_probe_type): Recognize RAM drives.
* libparted/arch/linux.c(linux_new): Handle RAM drives.
* libparted/arch/linux.c(_flush_cache): Skip RAM drives.
* parted/parted.c(do_print): Add "brd" to list of transports.

Signed-off-by: Sebastian Parschauer <sparschauer@suse.de>
---
 include/parted/device.in.h |  3 ++-
 libparted/arch/linux.c     | 12 ++++++++++--
 parted/parted.c            |  2 +-
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/include/parted/device.in.h b/include/parted/device.in.h
index d38db44..1b6e7b8 100644
--- a/include/parted/device.in.h
+++ b/include/parted/device.in.h
@@ -50,7 +50,8 @@ typedef enum {
         PED_DEVICE_AOE          = 16,
         PED_DEVICE_MD           = 17,
         PED_DEVICE_LOOP         = 18,
-        PED_DEVICE_NVME         = 19
+        PED_DEVICE_NVME         = 19,
+        PED_DEVICE_RAM          = 20
 } PedDeviceType;
 
 typedef struct _PedDevice PedDevice;
diff --git a/libparted/arch/linux.c b/libparted/arch/linux.c
index 2058697..c2fdab0 100644
--- a/libparted/arch/linux.c
+++ b/libparted/arch/linux.c
@@ -279,6 +279,7 @@ struct blkdev_ioctl_param {
 #define LOOP_MAJOR              7
 #define MD_MAJOR                9
 #define BLKEXT_MAJOR            259
+#define RAM_MAJOR               1
 
 #define SCSI_BLK_MAJOR(M) (                                             \
                 (M) == SCSI_DISK0_MAJOR                                 \
@@ -701,6 +702,8 @@ _device_probe_type (PedDevice* dev)
                 dev->type = PED_DEVICE_MD;
         } else if (_is_blkext_major(dev_major) && dev->path && strstr(dev->path, "nvme")) {
                 dev->type = PED_DEVICE_NVME;
+        } else if (dev_major == RAM_MAJOR) {
+                dev->type = PED_DEVICE_RAM;
         } else {
                 dev->type = PED_DEVICE_UNKNOWN;
         }
@@ -1547,6 +1550,11 @@ linux_new (const char* path)
                         goto error_free_arch_specific;
                 break;
 
+        case PED_DEVICE_RAM:
+                if (!init_generic (dev, _("RAM Drive")))
+                        goto error_free_arch_specific;
+                break;
+
         default:
                 ped_exception_throw (PED_EXCEPTION_NO_FEATURE,
                                 PED_EXCEPTION_CANCEL,
@@ -1619,9 +1627,9 @@ _flush_cache (PedDevice* dev)
 {
         LinuxSpecific*  arch_specific = LINUX_SPECIFIC (dev);
         int             i;
-	int             lpn = _device_get_partition_range(dev);
+        int             lpn = _device_get_partition_range(dev);
 
-        if (dev->read_only)
+        if (dev->read_only || dev->type == PED_DEVICE_RAM)
                 return;
         dev->dirty = 0;
 
diff --git a/parted/parted.c b/parted/parted.c
index f767bec..a7fcd3b 100644
--- a/parted/parted.c
+++ b/parted/parted.c
@@ -979,7 +979,7 @@ _print_disk_info (const PedDevice *dev, const PedDisk *diskp)
                                          "cpqarray", "file", "ataraid", "i2o",
                                          "ubd", "dasd", "viodasd", "sx8", "dm",
                                          "xvd", "sd/mmc", "virtblk", "aoe",
-                                         "md", "loopback", "nvme"};
+                                         "md", "loopback", "nvme", "brd"};
 
         char* start = ped_unit_format (dev, 0);
         PedUnit default_unit = ped_unit_get_default ();
-- 
2.9.3