140 lines
4.5 KiB
Diff
140 lines
4.5 KiB
Diff
From: Petr Uzel <petr.uzel@suse.cz>
|
|
Date: Thu, 26 May 2016 09:28:21 +0200
|
|
Subject: libparted: open the device RO and lazily switch to RW only if
|
|
necessary
|
|
References: bsc#979275
|
|
Patch-mainline: not yet
|
|
|
|
Avoid useless udev events triggered by opening the device RW
|
|
for purely read-only operations.
|
|
|
|
Author: Michael Matz <matz@suse.de>
|
|
[sparschauer: Use _flush_cache() also for reads, don't switch to RW
|
|
in _flush_cache() to avoid a possible recursion (bnc#989751), open
|
|
partitions in _flush_cache() O_RDONLY instead of O_WRONLY]
|
|
Signed-off-by: Sebastian Parschauer <sparschauer@suse.de>
|
|
---
|
|
libparted/arch/linux.c | 33 ++++++++++++++++++++++++++++++---
|
|
libparted/arch/linux.h | 1 +
|
|
2 files changed, 31 insertions(+), 3 deletions(-)
|
|
|
|
Index: parted-3.3/libparted/arch/linux.c
|
|
===================================================================
|
|
--- parted-3.3.orig/libparted/arch/linux.c
|
|
+++ parted-3.3/libparted/arch/linux.c
|
|
@@ -298,6 +298,9 @@ static unsigned int _device_get_partitio
|
|
static int _device_open (PedDevice* dev, int flags);
|
|
static int _device_open_ro (PedDevice* dev);
|
|
static int _device_close (PedDevice* dev);
|
|
+static int linux_close (PedDevice* dev);
|
|
+static void _flush_cache (PedDevice* dev);
|
|
+
|
|
|
|
static int
|
|
_read_fd (int fd, char **buf)
|
|
@@ -451,6 +454,22 @@ _is_blkext_major (int major)
|
|
return _major_type_in_devices (major, "blkext");
|
|
}
|
|
|
|
+static void
|
|
+_ensure_read_write (PedDevice *dev)
|
|
+{
|
|
+ PED_ASSERT (dev != NULL);
|
|
+ LinuxSpecific* arch_specific = LINUX_SPECIFIC (dev);
|
|
+
|
|
+ if (arch_specific->rw)
|
|
+ return;
|
|
+
|
|
+ if (!linux_close(dev))
|
|
+ return;
|
|
+
|
|
+ if (!_device_open (dev, RW_MODE))
|
|
+ return;
|
|
+}
|
|
+
|
|
#ifdef ENABLE_DEVICE_MAPPER
|
|
static int
|
|
_dm_task_run_wait (struct dm_task *task, uint32_t cookie)
|
|
@@ -1678,7 +1697,7 @@ _flush_cache (PedDevice* dev)
|
|
if (!name)
|
|
break;
|
|
if (!_partition_is_mounted_by_path (name)) {
|
|
- fd = open (name, WR_MODE, 0);
|
|
+ fd = open (name, RD_MODE, 0);
|
|
if (fd > -1) {
|
|
ioctl (fd, BLKFLSBUF);
|
|
retry:
|
|
@@ -1709,7 +1728,7 @@ _device_open_ro (PedDevice* dev)
|
|
static int
|
|
linux_open (PedDevice* dev)
|
|
{
|
|
- return _device_open (dev, RW_MODE);
|
|
+ return _device_open (dev, RD_MODE);
|
|
}
|
|
|
|
static int
|
|
@@ -1747,6 +1766,10 @@ retry:
|
|
}
|
|
} else {
|
|
dev->read_only = 0;
|
|
+ if (flags == WR_MODE || flags == RW_MODE)
|
|
+ arch_specific->rw = 1;
|
|
+ else
|
|
+ arch_specific->rw = 0;
|
|
}
|
|
|
|
_flush_cache (dev);
|
|
@@ -1984,6 +2007,7 @@ _write_lastoddsector (PedDevice* dev, co
|
|
|
|
PED_ASSERT(dev != NULL);
|
|
PED_ASSERT(buffer != NULL);
|
|
+ _ensure_read_write (dev);
|
|
|
|
arch_specific = LINUX_SPECIFIC (dev);
|
|
|
|
@@ -2032,6 +2056,9 @@ linux_write (PedDevice* dev, const void*
|
|
return 1;
|
|
}
|
|
|
|
+ _ensure_read_write (dev);
|
|
+ if (count == 0)
|
|
+ return 1; /* We just ensured the device is open RW (see call from dasd_write()) */
|
|
if (_get_linux_version() < KERNEL_VERSION (2,6,0)) {
|
|
/* Kludge. This is necessary to read/write the last
|
|
block of an odd-sized disk, until Linux 2.5.x kernel fixes.
|
|
@@ -2570,6 +2597,7 @@ _blkpg_part_command (PedDevice* dev, str
|
|
LinuxSpecific* arch_specific = LINUX_SPECIFIC (dev);
|
|
struct blkpg_ioctl_arg ioctl_arg;
|
|
|
|
+ _ensure_read_write (dev);
|
|
ioctl_arg.op = op;
|
|
ioctl_arg.flags = 0;
|
|
ioctl_arg.datalen = sizeof (struct blkpg_partition);
|
|
Index: parted-3.3/libparted/arch/linux.h
|
|
===================================================================
|
|
--- parted-3.3.orig/libparted/arch/linux.h
|
|
+++ parted-3.3/libparted/arch/linux.h
|
|
@@ -30,6 +30,7 @@ struct _LinuxSpecific {
|
|
int fd;
|
|
int major;
|
|
int minor;
|
|
+ int rw;
|
|
char* dmtype; /**< device map target type */
|
|
#if defined __s390__ || defined __s390x__
|
|
unsigned int real_sector_size;
|
|
Index: parted-3.3/libparted/labels/dasd.c
|
|
===================================================================
|
|
--- parted-3.3.orig/libparted/labels/dasd.c
|
|
+++ parted-3.3/libparted/labels/dasd.c
|
|
@@ -637,6 +637,10 @@ dasd_write (const PedDisk* disk)
|
|
return 1;
|
|
}
|
|
|
|
+ /* Ensure the device is open RW */
|
|
+ char dummy[10]; /* to avoid assertion in ped_device_write */
|
|
+ ped_device_write(disk->dev, &dummy, 0, 0);
|
|
+
|
|
/* initialize the anchor */
|
|
fdasd_initialize_anchor(&anchor);
|
|
if (fdasd_get_geometry(disk->dev, &anchor, arch_specific->fd) == 0)
|