ATA_STD_QC_DEFER(9) libata Library ATA_STD_QC_DEFER(9)NAME
ata_std_qc_defer - Check whether a qc needs to be deferred
int ata_std_qc_defer(struct ata_queued_cmd * qc);
ATA command in question
Non-NCQ commands cannot run with any other command, NCQ or not. As upper layer only knows the queue depth, we are responsible for
maintaining exclusion. This function checks whether a new command qc can be issued.
ATA_DEFER_* if deferring is needed, 0 otherwise.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 ATA_STD_QC_DEFER(9)
Check Out this Related Man Page
SRP_RECONNECT_RPORT(9) SCSI mid layer SRP_RECONNECT_RPORT(9)NAME
srp_reconnect_rport - reconnect to an SRP target port
int srp_reconnect_rport(struct srp_rport * rport);
-- undescribed --
Blocks SCSI command queueing before invoking reconnect such that queuecommand won't be invoked concurrently with reconnect from outside the
SCSI EH. This is important since a reconnect implementation may reallocate resources needed by queuecommand.
- This function neither waits until outstanding requests have finished nor tries to abort these. It is the responsibility of the reconnect
function to finish outstanding commands before reconnecting to the target port. - It is the responsibility of the caller to ensure that the
resources reallocated by the reconnect function won't be used while this function is in progress. One possible strategy is to invoke this
function from the context of the SCSI EH thread only. Another possible strategy is to lock the rport mutex inside each SCSI LLD callback
that can be invoked by the SCSI EH (the scsi_host_template.eh_*() functions and also the scsi_host_template.queuecommand function).
James Bottomley <James.Bottomley@hansenpartnership.com>
Rob Landley <email@example.com>
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SRP_RECONNECT_RPORT(9)
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