adulau/aha
1
0
Fork 0
mirror of https://github.com/adulau/aha.git synced 2024-12-29 04:06:22 +00:00
Code Issues Projects Releases Packages Wiki Activity

[S390] dasd_eckd / Write format R0 is now allowed BB

Browse source 
Permission is now granted to the subsystem to format write R0 with:
* an ID = CCHHR, where CC = physical cylinder number,
  HH = physical head number, and R = 0
* a key length of zero
* a data length of eight
* a data field containing all zeros

Signed-off-by: Jean-Baptiste Joret <joret@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Jean-Baptiste Joret 2009-03-26 15:23:46 +01:00 committed by Martin Schwidefsky
parent 0000d03170
commit f9a28f7bc5
1 changed files with 19 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
drivers/s390/block/dasd_eckd.c
View file

@ -1265,6 +1265,8 @@ dasd_eckd_format_device(struct dasd_device * device,
int rpt, cyl, head; int rpt, cyl, head;
int cplength, datasize; int cplength, datasize;
int i; int i;
int intensity = 0;
int r0_perm;
private = (struct dasd_eckd_private *) device->private; private = (struct dasd_eckd_private *) device->private;
rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize); rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
@ -1296,9 +1298,17 @@ dasd_eckd_format_device(struct dasd_device * device,
* Bit 1: write home address, currently not supported * Bit 1: write home address, currently not supported
* Bit 2: invalidate tracks * Bit 2: invalidate tracks
* Bit 3: use OS/390 compatible disk layout (cdl) * Bit 3: use OS/390 compatible disk layout (cdl)
* Bit 4: do not allow storage subsystem to modify record zero
* Only some bit combinations do make sense. * Only some bit combinations do make sense.
*/ */
switch (fdata->intensity) { if (fdata->intensity & 0x10) {
r0_perm = 0;
intensity = fdata->intensity & ~0x10;
} else {
r0_perm = 1;
intensity = fdata->intensity;
}
switch (intensity) {
case 0x00: /* Normal format */ case 0x00: /* Normal format */
case 0x08: /* Normal format, use cdl. */ case 0x08: /* Normal format, use cdl. */
cplength = 2 + rpt; cplength = 2 + rpt;
@ -1335,11 +1345,14 @@ dasd_eckd_format_device(struct dasd_device * device,
data = fcp->data; data = fcp->data;
ccw = fcp->cpaddr; ccw = fcp->cpaddr;
switch (fdata->intensity & ~0x08) { switch (intensity & ~0x08) {
case 0x00: /* Normal format. */ case 0x00: /* Normal format. */
define_extent(ccw++, (struct DE_eckd_data *) data, define_extent(ccw++, (struct DE_eckd_data *) data,
fdata->start_unit, fdata->start_unit, fdata->start_unit, fdata->start_unit,
DASD_ECKD_CCW_WRITE_CKD, device); DASD_ECKD_CCW_WRITE_CKD, device);
/* grant subsystem permission to format R0 */
if (r0_perm)
((struct DE_eckd_data *)data)->ga_extended |= 0x04;
data += sizeof(struct DE_eckd_data); data += sizeof(struct DE_eckd_data);
ccw[-1].flags |= CCW_FLAG_CC; ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, (struct LO_eckd_data *) data, locate_record(ccw++, (struct LO_eckd_data *) data,
@ -1373,7 +1386,7 @@ dasd_eckd_format_device(struct dasd_device * device,
data += sizeof(struct LO_eckd_data); data += sizeof(struct LO_eckd_data);
break; break;
} }
if (fdata->intensity & 0x01) { /* write record zero */ if (intensity & 0x01) { /* write record zero */
ect = (struct eckd_count *) data; ect = (struct eckd_count *) data;
data += sizeof(struct eckd_count); data += sizeof(struct eckd_count);
ect->cyl = cyl; ect->cyl = cyl;
@ -1388,7 +1401,7 @@ dasd_eckd_format_device(struct dasd_device * device,
ccw->cda = (__u32)(addr_t) ect; ccw->cda = (__u32)(addr_t) ect;
ccw++; ccw++;
} }
if ((fdata->intensity & ~0x08) & 0x04) { /* erase track */ if ((intensity & ~0x08) & 0x04) { /* erase track */
ect = (struct eckd_count *) data; ect = (struct eckd_count *) data;
data += sizeof(struct eckd_count); data += sizeof(struct eckd_count);
ect->cyl = cyl; ect->cyl = cyl;
@ -1411,14 +1424,14 @@ dasd_eckd_format_device(struct dasd_device * device,
ect->kl = 0; ect->kl = 0;
ect->dl = fdata->blksize; ect->dl = fdata->blksize;
/* Check for special tracks 0-1 when formatting CDL */ /* Check for special tracks 0-1 when formatting CDL */
if ((fdata->intensity & 0x08) && if ((intensity & 0x08) &&
fdata->start_unit == 0) { fdata->start_unit == 0) {
if (i < 3) { if (i < 3) {
ect->kl = 4; ect->kl = 4;
ect->dl = sizes_trk0[i] - 4; ect->dl = sizes_trk0[i] - 4;
} }
} }
if ((fdata->intensity & 0x08) && if ((intensity & 0x08) &&
fdata->start_unit == 1) { fdata->start_unit == 1) {
ect->kl = 44; ect->kl = 44;
ect->dl = LABEL_SIZE - 44; ect->dl = LABEL_SIZE - 44;