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scsi: target: transport should handle st FM/EOM/ILI reads

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When a tape drive is exported via LIO using the pscsi module, a read
that requests more bytes per block than the tape can supply returns an
empty buffer. This is because the pscsi pass-through target module sees
the "ILI" illegal length bit set and thinks there is no reason to return
the data.

This is a long-standing transport issue, since it assumes that no data
need be returned under a check condition, which isn't always the case
for tape.

Add in a check for tape reads with the ILI, EOM, or FM bits set, with a
sense code of NO_SENSE, treating such cases as if the read
succeeded. The layered tape driver then "does the right thing" when it
gets such a response.

Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com>
Signed-off-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Lee Duncan
2018-05-15 18:25:24 -07:00
committed by Martin K. Petersen
parent 51b910c3c7
commit bd81372065
3 changed files with 62 additions and 8 deletions
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include/target/target_core_base.h
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@@ -143,6 +143,7 @@ enum se_cmd_flags_table {
SCF_ACK_KREF = 0x00400000,
SCF_USE_CPUID = 0x00800000,
SCF_TASK_ATTR_SET = 0x01000000,
SCF_TREAT_READ_AS_NORMAL = 0x02000000,
};
/*