Mikhail Zaslonko 279070fa43 zdump/ngdump: Fix seek error on 'zgetdump -d' ...

When checking CDL formatted DASD for installed dump-tool (zgetdump -d),
we might stumble upon an 'empty' boot record pointer in the volume label
filled with bytes of 0x40 (EBCDIC spaces). This leads to the following
seek error reported:

  # zgetdump -d /dev/dasdb
  zgetdump: Could not seek "/dev/dasdb" (Invalid argument)

Check for empty boot record and return proper error code by
ngdump_get_eckd_part_num() in order to end up with a regular
"No dump tool found" message.

Fixes: f3bcd94524 ("zdump: Add zgetdump -d support for ECKD ldipl-dump")
Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

2024-10-01 12:16:19 +02:00

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