Sync with SLES-12 SP2 for bsc#989751 and bsc#979275 OBS-URL: https://build.opensuse.org/request/show/417986 OBS-URL: https://build.opensuse.org/package/show/Base:System/parted?expand=0&rev=123
141 lines
4.7 KiB
Diff
141 lines
4.7 KiB
Diff
From b9420b8e618c8ad988c410e4289273ac962ec918 Mon Sep 17 00:00:00 2001
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From: Petr Uzel <petr.uzel@suse.cz>
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Date: Thu, 26 May 2016 09:28:21 +0200
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Subject: [PATCH] libparted: open the device RO and lazily switch to RW only if
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necessary
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[sparschauer: Use _flush_cache() also for reads, don't switch to RW
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in _flush_cache() to avoid a possible recursion (bnc#989751), open
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partitions in _flush_cache() O_RDONLY instead of O_WRONLY]
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Signed-off-by: Sebastian Parschauer <sparschauer@suse.de>
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Avoid useless udev events triggered by opening the device RW
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for purely read-only operations.
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References: https://bugzilla.novell.com/show_bug.cgi?id=979275
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Author: Michael Matz <matz@suse.de>
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---
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libparted/arch/linux.c | 33 ++++++++++++++++++++++++++++++---
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libparted/arch/linux.h | 1 +
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2 files changed, 31 insertions(+), 3 deletions(-)
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Index: parted-3.2/libparted/arch/linux.c
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===================================================================
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--- parted-3.2.orig/libparted/arch/linux.c
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+++ parted-3.2/libparted/arch/linux.c
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@@ -295,6 +295,9 @@ static unsigned int _device_get_partitio
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static int _device_open (PedDevice* dev, int flags);
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static int _device_open_ro (PedDevice* dev);
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static int _device_close (PedDevice* dev);
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+static int linux_close (PedDevice* dev);
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+static void _flush_cache (PedDevice* dev);
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+
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static int
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_read_fd (int fd, char **buf)
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@@ -442,6 +445,22 @@ _is_virtblk_major (int major)
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return _major_type_in_devices (major, "virtblk");
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}
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+static void
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+_ensure_read_write (PedDevice *dev)
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+{
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+ PED_ASSERT (dev != NULL);
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+ LinuxSpecific* arch_specific = LINUX_SPECIFIC (dev);
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+
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+ if (arch_specific->rw)
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+ return;
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+
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+ if (!linux_close(dev))
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+ return;
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+
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+ if (!_device_open (dev, RW_MODE))
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+ return;
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+}
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+
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#ifdef ENABLE_DEVICE_MAPPER
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static int
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_dm_task_run_wait (struct dm_task *task, uint32_t cookie)
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@@ -1603,7 +1622,7 @@ _flush_cache (PedDevice* dev)
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if (!name)
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break;
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if (!_partition_is_mounted_by_path (name)) {
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- fd = open (name, WR_MODE, 0);
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+ fd = open (name, RD_MODE, 0);
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if (fd > 0) {
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ioctl (fd, BLKFLSBUF);
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retry:
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@@ -1634,7 +1653,7 @@ _device_open_ro (PedDevice* dev)
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static int
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linux_open (PedDevice* dev)
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{
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- return _device_open (dev, RW_MODE);
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+ return _device_open (dev, RD_MODE);
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}
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static int
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@@ -1672,6 +1691,10 @@ retry:
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}
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} else {
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dev->read_only = 0;
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+ if (flags == WR_MODE || flags == RW_MODE)
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+ arch_specific->rw = 1;
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+ else
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+ arch_specific->rw = 0;
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}
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_flush_cache (dev);
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@@ -1907,6 +1930,7 @@ _write_lastoddsector (PedDevice* dev, co
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PED_ASSERT(dev != NULL);
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PED_ASSERT(buffer != NULL);
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+ _ensure_read_write (dev);
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arch_specific = LINUX_SPECIFIC (dev);
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@@ -1955,6 +1979,9 @@ linux_write (PedDevice* dev, const void*
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return 1;
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}
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+ _ensure_read_write (dev);
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+ if (count == 0)
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+ return 1; /* We just ensured the device is open RW (see call from dasd_write()) */
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if (_get_linux_version() < KERNEL_VERSION (2,6,0)) {
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/* Kludge. This is necessary to read/write the last
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block of an odd-sized disk, until Linux 2.5.x kernel fixes.
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@@ -2480,6 +2507,7 @@ _blkpg_part_command (PedDevice* dev, str
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LinuxSpecific* arch_specific = LINUX_SPECIFIC (dev);
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struct blkpg_ioctl_arg ioctl_arg;
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+ _ensure_read_write (dev);
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ioctl_arg.op = op;
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ioctl_arg.flags = 0;
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ioctl_arg.datalen = sizeof (struct blkpg_partition);
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Index: parted-3.2/libparted/arch/linux.h
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===================================================================
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--- parted-3.2.orig/libparted/arch/linux.h
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+++ parted-3.2/libparted/arch/linux.h
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@@ -30,6 +30,7 @@ struct _LinuxSpecific {
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int fd;
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int major;
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int minor;
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+ int rw;
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char* dmtype; /**< device map target type */
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#if defined __s390__ || defined __s390x__
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unsigned int real_sector_size;
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Index: parted-3.2/libparted/labels/dasd.c
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===================================================================
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--- parted-3.2.orig/libparted/labels/dasd.c
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+++ parted-3.2/libparted/labels/dasd.c
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@@ -639,6 +639,10 @@ dasd_write (const PedDisk* disk)
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if (disk_specific->format_type == 1)
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return 1;
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+ /* Ensure the device is open RW */
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+ char dummy[10]; /* to avoid assertion in ped_device_write */
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+ ped_device_write(disk->dev, &dummy, 0, 0);
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+
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/* initialize the anchor */
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fdasd_initialize_anchor(&anchor);
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fdasd_get_geometry(disk->dev, &anchor, arch_specific->fd);
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