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scsi: target: core: Document target_cmd_size_check()

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Since it is nontrivial to derive the meaning of the size argument from the
code, add a documentation header above target_cmd_size_check().

Cc: Mike Christie <mchristi@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Link: https://lore.kernel.org/r/20191107215458.64242-1-bvanassche@acm.org
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2019-11-07 13:54:58 -08:00 committed by Martin K. Petersen
parent 29d28f2b8d
commit 11bf1d14b2
1 changed files with 13 additions and 0 deletions
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13
drivers/target/target_core_transport.c
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@ -1243,6 +1243,19 @@ target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
return TCM_NO_SENSE;
}
/**
* target_cmd_size_check - Check whether there will be a residual.
* @cmd: SCSI command.
* @size: Data buffer size derived from CDB. The data buffer size provided by
* the SCSI transport driver is available in @cmd->data_length.
*
* Compare the data buffer size from the CDB with the data buffer limit from the transport
* header. Set @cmd->residual_count and SCF_OVERFLOW_BIT or SCF_UNDERFLOW_BIT if necessary.
*
* Note: target drivers set @cmd->data_length by calling transport_init_se_cmd().
*
* Return: TCM_NO_SENSE
*/
sense_reason_t
target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
{