There has been a desire to set the lun queue depth on all luns on an
shost. Today that is done by an external script looping through
discovered sdevs and set an sdev attribute. The desire is to have a
single shost attribute that performs this work removing the requirement
for scripting.
This patch:
- Refactors the existing sdev change max queue depth attribute so the
meat of it becomes a service routine.
- Creates a shost helper routine, lldd callable, which cycles though
all sdevs on the shost and changes their max queue depth. Uses the
new service routine.
- Adds a new shost attribute which calls the new shost helper routine.
v2:
Reworked the patch with recommendations on error returns and breaking into
smaller patches. I also had a request to make the shost change routine to
be lldd callable. So switched up how that was implemented as well.
v3:
Revert use of -ENOTSUPP. Use -EINVAL or -ENXIO instead.
Clean up spacing and unnecessary parens.
Use kstrtouint
Specify attribute permissions in octl
-- james
James Smart (3):
scsi: refactor sdev lun queue depth setting via sysfs
scsi: add shost helper to set max queue depth on all of its devices
scsi: add shost attribute to set max queue depth on all devices on the
shost
drivers/scsi/scsi.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/scsi/scsi_priv.h | 1 +
drivers/scsi/scsi_sysfs.c | 28 +++++++++++++++++++-----
include/scsi/scsi_device.h | 1 +
4 files changed, 79 insertions(+), 5 deletions(-)
--
2.13.7
