On Fri, 5 Dec 2014 18:56:19 +0100
Ekaterina Tumanova <tuman...@linux.vnet.ibm.com> wrote:
This patch introduces driver methods of defining disk blocksizes
(physical and logical) and hard drive geometry.
The method is only implemented for "host_device". For "raw" devices
driver calls child's method.
For the time being geometry detection will only work for DASD devices.
In order to check that a local check_for_dasd function was introduced,
which calls BIODASDINFO2 ioctl and returns its rc.
Blocksizes detection fuction will probe sizes for DASD devices and
set default for other devices.
Signed-off-by: Ekaterina Tumanova <tuman...@linux.vnet.ibm.com>
---
block/raw-posix.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
block/raw_bsd.c | 14 +++++++++
2 files changed, 105 insertions(+)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 633d5bc..33f9983 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -56,6 +56,7 @@
#include <linux/cdrom.h>
#include <linux/fd.h>
#include <linux/fs.h>
+#include <linux/hdreg.h>
#ifndef FS_NOCOW_FL
#define FS_NOCOW_FL 0x00800000 /* Do not cow file */
#endif
@@ -90,6 +91,10 @@
#include <xfs/xfs.h>
#endif
+#ifdef __s390__
+#include <asm/dasd.h>
+#endif
+
//#define DEBUG_FLOPPY
//#define DEBUG_BLOCK
@@ -242,6 +247,20 @@ static int probe_logical_blocksize(int fd, unsigned int
*sector_size)
return 0;
}
+/*
+ * Set physical block size via ioctl. On success return 0. Otherwise -errno.
+ */
+static int probe_physical_blocksize(int fd, unsigned int *blk_size)
+{
+#ifdef BLKPBSZGET
+ if (ioctl(fd, BLKPBSZGET, blk_size) < 0) {
+ return -errno;
+ }
+#endif
+
+ return 0;
+}
+
static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp)
{
BDRVRawState *s = bs->opaque;
@@ -662,6 +681,76 @@ static void raw_refresh_limits(BlockDriverState *bs, Error
**errp)
bs->bl.opt_mem_alignment = s->buf_align;
}
+static int check_for_dasd(int fd)
+{
+#ifdef BIODASDINFO2
+ struct dasd_information2_t info = {0};
+
+ return ioctl(fd, BIODASDINFO2, &info);
+#endif
+ return -1;
I'd put the "return -1" line into an #else branch of the #ifdef, so
that you do not end up with two consecutive return statements in case
BIODASDINFO2 is defined.
+}
+
+/*
+ * Try to get the device blocksize. On success 0. On failure return -errno.
+ * Currently only implemented for DASD drives.
+ */
+static int hdev_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz)
+{
+ BDRVRawState *s = bs->opaque;
+ int ret;
+
+ /* If DASD, get blocksizes */
+ if (check_for_dasd(s->fd) < 0) {
+ return -1;
+ }
+ ret = probe_logical_blocksize(s->fd, &bsz->log);
+ if (ret < 0) {
+ return ret;
+ }
+ return probe_physical_blocksize(s->fd, &bsz->phys);
+}
+
+/*
+ * Try to get the device geometry. On success 0. On failure return -errno.
"On success return 0"
+ * Currently only implemented for DASD drives.
+ */
+static int hdev_probe_geometry(BlockDriverState *bs, hdGeometry *geo)
+{
+ BDRVRawState *s = bs->opaque;
+ struct hd_geometry ioctl_geo = {0};
+ uint32_t blksize;
+
+ /* If DASD, get it's geometry */
+ if (check_for_dasd(s->fd) < 0) {
+ return -1;
+ }
+ if (ioctl(s->fd, HDIO_GETGEO, &ioctl_geo) < 0) {
+ return -errno;
+ }
+ /* HDIO_GETGEO may return success even though geo contains zeros
+ (e.g. certain multipath setups) */
+ if (!ioctl_geo.heads || !ioctl_geo.sectors || !ioctl_geo.cylinders) {
+ return -1;
+ }
+ /* Do not return a geometry for partition */
+ if (ioctl_geo.start != 0) {
+ return -1;
+ }
+ geo->heads = ioctl_geo.heads;
+ geo->sectors = ioctl_geo.sectors;
+ if (bs->total_sectors) {
Maybe add a comment here why you've got to calculate the cylinders here
instead of using ioctl_geo.cylinders ?
+ if (!probe_physical_blocksize(s->fd, &blksize)) {
+ geo->cylinders = bs->total_sectors / (blksize / BDRV_SECTOR_SIZE)
+ / (geo->heads * geo->sectors);
+ return 0;
+ }
+ }
+ geo->cylinders = ioctl_geo.cylinders;
+
+ return 0;
+}
+
static ssize_t handle_aiocb_ioctl(RawPosixAIOData *aiocb)
{
int ret;
@@ -2127,6 +2216,8 @@ static BlockDriver bdrv_host_device = {
.bdrv_get_info = raw_get_info,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,
+ .bdrv_probe_blocksizes = hdev_probe_blocksizes,
+ .bdrv_probe_geometry = hdev_probe_geometry,
.bdrv_detach_aio_context = raw_detach_aio_context,
.bdrv_attach_aio_context = raw_attach_aio_context,
diff --git a/block/raw_bsd.c b/block/raw_bsd.c
index 401b967..cfd5249 100644
--- a/block/raw_bsd.c
+++ b/block/raw_bsd.c
@@ -173,6 +173,18 @@ static int raw_probe(const uint8_t *buf, int buf_size,
const char *filename)
return 1;
}
+static int raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz)
+{
+ bdrv_probe_blocksizes(bs->file, bsz);
+
+ return 0;
+}
+
+static int raw_probe_geometry(BlockDriverState *bs, hdGeometry *geo)
+{
+ return bdrv_probe_geometry(bs->file, geo);
+}
+
static BlockDriver bdrv_raw = {
.format_name = "raw",
.bdrv_probe = &raw_probe,
@@ -190,6 +202,8 @@ static BlockDriver bdrv_raw = {
.has_variable_length = true,
.bdrv_get_info = &raw_get_info,
.bdrv_refresh_limits = &raw_refresh_limits,
+ .bdrv_probe_blocksizes = &raw_probe_blocksizes,
+ .bdrv_probe_geometry = &raw_probe_geometry,
.bdrv_is_inserted = &raw_is_inserted,
.bdrv_media_changed = &raw_media_changed,
.bdrv_eject = &raw_eject,
Hmmm, raw_probe_blocksizes() calls bdrv_probe_blocksizes(), but when I
look at your patch 1/5, bdrv_probe_blocksizes() wants to call
drv->bdrv_probe_blocksizes() (i.e. raw_probe_blocksizes()) again?
Don't you get an endless recursive loop here? Or did I miss something?
*confused*
Thomas
