[parted-devel] [PATCH v2 1/2] fdasd: geometry handling updated from upstream s390-tools
Hendrik Brueckner
brueckner at linux.vnet.ibm.com
Thu Sep 17 13:33:28 UTC 2015
From: Viktor Mihajlovski <mihajlov at linux.vnet.ibm.com>
Remove the necessity for DASD-specific ioctls for partition handling.
This allows to correctly handle DASD-backed virtio block devices.
Note that this is necessary because virtio is just the transport.
A DASD, even if provided via virtio, still has it's unique
characteristics, which means that only traditional DASD partition
table formats can be used (no MBR, GPT, or similar).
Use bzero for initialization to make sure all struct members are
properly cleared. Also changed partition list handling code to be
more similar to upstream s390-tools fdasd.
Further, enhanced error handling capabilities by providing a
return code by fdasd_get_geometry.
Code is largely backported from s390-tools project.
Signed-off-by: Viktor Mihajlovski <mihajlov at linux.vnet.ibm.com>
Acked-by: Stefan Haberland <stefan.haberland at de.ibm.com>
Signed-off-by: Hendrik Brueckner <brueckner at linux.vnet.ibm.com>
---
include/parted/fdasd.in.h | 4 +-
libparted/labels/fdasd.c | 166 +++++++++++++++++++++++++++++++--------------
2 files changed, 119 insertions(+), 51 deletions(-)
diff --git a/include/parted/fdasd.in.h b/include/parted/fdasd.in.h
index 6f6a7e0..4e351c4 100644
--- a/include/parted/fdasd.in.h
+++ b/include/parted/fdasd.in.h
@@ -190,6 +190,8 @@ typedef struct format_data_t {
#define BLKRRPART _IO(0x12,95)
/* get block device sector size */
#define BLKSSZGET _IO(0x12,104)
+/* device size in bytes (u64 *arg)*/
+#define BLKGETSIZE64 _IOR(0x12,114,size_t)
/* get device geometry */
#define HDIO_GETGEO 0x0301
@@ -285,7 +287,7 @@ enum fdasd_failure {
void fdasd_cleanup (fdasd_anchor_t *anchor);
void fdasd_initialize_anchor (fdasd_anchor_t * anc);
-void fdasd_get_geometry (const PedDevice *dev, fdasd_anchor_t *anc, int fd);
+int fdasd_get_geometry (const PedDevice *dev, fdasd_anchor_t *anc, int fd);
void fdasd_check_api_version (fdasd_anchor_t *anc, int fd);
int fdasd_check_volume (fdasd_anchor_t *anc, int fd);
int fdasd_write_labels (fdasd_anchor_t *anc, int fd);
diff --git a/libparted/labels/fdasd.c b/libparted/labels/fdasd.c
index 1f87937..7e6a77a 100644
--- a/libparted/labels/fdasd.c
+++ b/libparted/labels/fdasd.c
@@ -210,27 +210,7 @@ fdasd_initialize_anchor (fdasd_anchor_t * anc)
partition_info_t *p = NULL;
partition_info_t *q = NULL;
- anc->devno = 0;
- anc->dev_type = 0;
- anc->used_partitions = 0;
-
- anc->silent = 0;
- anc->verbose = 0;
- anc->big_disk = 0;
- anc->volid_specified = 0;
- anc->config_specified = 0;
- anc->auto_partition = 0;
- anc->devname_specified = 0;
- anc->print_table = 0;
-
- anc->option_reuse = 0;
- anc->option_recreate = 0;
-
- anc->vlabel_changed = 0;
- anc->vtoc_changed = 0;
- anc->blksize = 0;
- anc->fspace_trk = 0;
- anc->label_pos = 0;
+ bzero(anc, sizeof(fdasd_anchor_t));
for (i=0; i<USABLE_PARTITIONS; i++)
setpos(anc, i, -1);
@@ -272,24 +252,18 @@ fdasd_initialize_anchor (fdasd_anchor_t * anc)
if (p == NULL)
fdasd_error(anc, malloc_failed,
_("No room for partition info."));
- p->used = 0x00;
- p->len_trk = 0;
- p->start_trk = 0;
- p->fspace_trk = 0;
- p->type = 0;
+ bzero(p, sizeof(partition_info_t));
/* add p to double pointered list */
if (i == 1) {
- anc->first = p;
- p->prev = NULL;
+ anc->first = p;
} else if (i == USABLE_PARTITIONS) {
- anc->last = p;
- p->next = NULL;
+ anc->last = p;
p->prev = q;
q->next = p;
} else {
- p->prev = q;
- q->next = p;
+ p->prev = q;
+ q->next = p;
}
p->f1 = malloc(sizeof(format1_label_t));
@@ -947,15 +921,77 @@ fdasd_check_api_version (fdasd_anchor_t *anc, int f)
}
/*
+ * The following two functions match those in the DASD ECKD device driver.
+ * They are used to compute how many records of a given size can be stored
+ * in one track.
+ */
+static unsigned int ceil_quot(unsigned int d1, unsigned int d2)
+{
+ return (d1 + (d2 - 1)) / d2;
+}
+
+/* kl: key length, dl: data length */
+static unsigned int recs_per_track(unsigned short dev_type, unsigned int kl,
+ unsigned int dl)
+{
+ unsigned int dn, kn;
+
+ switch (dev_type) {
+ case DASD_3380_TYPE:
+ if (kl)
+ return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
+ ceil_quot(dl + 12, 32));
+ else
+ return 1499 / (15 + ceil_quot(dl + 12, 32));
+ case DASD_3390_TYPE:
+ dn = ceil_quot(dl + 6, 232) + 1;
+ if (kl) {
+ kn = ceil_quot(kl + 6, 232) + 1;
+ return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
+ 9 + ceil_quot(dl + 6 * dn, 34));
+ } else
+ return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
+ case DASD_9345_TYPE:
+ dn = ceil_quot(dl + 6, 232) + 1;
+ if (kl) {
+ kn = ceil_quot(kl + 6, 232) + 1;
+ return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
+ ceil_quot(dl + 6 * dn, 34));
+ } else
+ return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
+ }
+ return 0;
+}
+
+/*
+ * Verify that number of tracks (heads) per cylinder and number of
+ * sectors per track match the expected values for a given device type
+ * and block size.
+ * Returns 1 for a valid match and 0 otherwise.
+ */
+static int fdasd_verify_geometry(unsigned short dev_type, int blksize,
+ struct fdasd_hd_geometry *geometry)
+{
+ unsigned int expected_sectors;
+ if (geometry->heads != 15)
+ return 0;
+ expected_sectors = recs_per_track(dev_type, 0, blksize);
+ if (geometry->sectors == expected_sectors)
+ return 1;
+ return 0;
+}
+
+/*
* reads dasd geometry data
*/
-void
+int
fdasd_get_geometry (const PedDevice *dev, fdasd_anchor_t *anc, int f)
{
PDEBUG
int blksize = 0;
dasd_information_t dasd_info;
struct dasd_eckd_characteristics *characteristics;
+ unsigned long long size_in_bytes;
/* We can't get geometry from a regular file,
so simulate something usable, for the sake of testing. */
@@ -979,6 +1015,12 @@ fdasd_get_geometry (const PedDevice *dev, fdasd_anchor_t *anc, int f)
anc->geo.heads;
anc->is_file = 1;
} else {
+ if (ioctl(f, BLKGETSIZE64, &size_in_bytes) != 0) {
+ fdasd_error(anc, unable_to_ioctl,
+ _("Could not retrieve disk size."));
+ goto error;
+ }
+
if (ioctl(f, HDIO_GETGEO, &anc->geo) != 0)
fdasd_error(anc, unable_to_ioctl,
_("Could not retrieve disk geometry information."));
@@ -988,27 +1030,51 @@ fdasd_get_geometry (const PedDevice *dev, fdasd_anchor_t *anc, int f)
_("Could not retrieve blocksize information."));
/* get disk type */
- if (ioctl(f, BIODASDINFO, &dasd_info) != 0)
- fdasd_error(anc, unable_to_ioctl,
- _("Could not retrieve disk information."));
-
- characteristics = (struct dasd_eckd_characteristics *)
- &dasd_info.characteristics;
- if (characteristics->no_cyl == LV_COMPAT_CYL &&
- characteristics->long_no_cyl)
- anc->hw_cylinders = characteristics->long_no_cyl;
- else
- anc->hw_cylinders = characteristics->no_cyl;
+ if (ioctl(f, BIODASDINFO, &dasd_info) != 0) {
+ /* verify that the geometry matches a 3390 DASD */
+ if (!fdasd_verify_geometry(DASD_3390_TYPE, blksize,
+ &anc->geo)) {
+ fdasd_error(anc, wrong_disk_type,
+ _("Disk geometry does not match a " \
+ "DASD device of type 3390."));
+ goto error;
+ }
+ anc->dev_type = DASD_3390_TYPE;
+ anc->hw_cylinders =
+ size_in_bytes / (blksize * anc->geo.heads * anc->geo.sectors);
+ /* The VOL1 label on a CDL formatted ECKD DASD is in block 2
+ * It will be verified later, if this position actually holds a
+ * valid label record.
+ */
+ anc->label_pos = 2 * blksize;
+ /* A devno 0 is actually a valid devno, which could exist
+ * in the system. Since we use this number only to create
+ * a default volume serial, there is no serious conflict.
+ */
+ anc->devno = 0;
+ } else {
+ characteristics = (struct dasd_eckd_characteristics *)
+ &dasd_info.characteristics;
+ if (characteristics->no_cyl == LV_COMPAT_CYL &&
+ characteristics->long_no_cyl)
+ anc->hw_cylinders = characteristics->long_no_cyl;
+ else
+ anc->hw_cylinders = characteristics->no_cyl;
+ anc->dev_type = dasd_info.dev_type;
+ anc->label_pos = dasd_info.label_block * blksize;
+ anc->devno = dasd_info.devno;
+ anc->label_block = dasd_info.label_block;
+ anc->FBA_layout = dasd_info.FBA_layout;
+ }
anc->is_file = 0;
}
- anc->dev_type = dasd_info.dev_type;
- anc->blksize = blksize;
- anc->label_pos = dasd_info.label_block * blksize;
- anc->devno = dasd_info.devno;
- anc->label_block = dasd_info.label_block;
- anc->FBA_layout = dasd_info.FBA_layout;
+ anc->blksize = blksize;
+ return 1;
+
+ error:
+ return 0;
}
/*
--
1.7.1
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