K 10
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V 3
avg
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svn:date
V 27
2018-02-15T16:31:35.909326Z
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V 697
MFC r327996: geom_disk / scsi_da: deny opening write-protected disks for writing

Ths change consists of two parts.

geom_disk: deny opening a disk for writing if it's marked as
write-protected.  A new disk(9) flag is added to mark write protected
disks.  A possible alternative could be to add another parameter to d_open,
so that the open mode could be passed to it and the disk drivers could
make the decision internally, but the flag required less churn.

scsi_da: add a new phase of disk probing to query the all pages mode
sense page.  We can determine if the disk is write protected using bit 7
of the device specific field in the mode parameter header returned by
MODE SENSE.

PR:		224037

END