From: "Ewan D. Milne" <emilne@xxxxxxxxxx> This patch set adds changes to the SCSI mid-layer, sysfs and scsi_debug to provide enhanced support for Unit Attention conditions, as well as detection of reported sense data overflow conditions and some changes to sense data processing. It also adds a uevent when the reported capacity changes on an sd device. There was some discussion about this a couple of years ago on the linux-scsi mailing list: http://marc.info/?l=linux-scsi&m=129702506514742&w=2 Although one approach is to send all SCSI sense data to a userspace daemon for processing, this patch set does not take that approach due to the difficulty in reliably delivering all of the data. An interesting UA condition might not be delivered due to a flood of media errors, for example. The mechanism used is to flag when certain UA ASC/ASCQ codes are received that report asynchronous changes to the storage device configuration. An appropriate uevent is then generated for the scsi_device or scsi_target object. An aggregation mechanism is used to avoid generating uevents at too high a rate, and to coalesce multiple UAs reported by LUNs on the same target for a REPORTED LUNS DATA HAS CHANGED sense code. The changes are (mostly) enabled by a new kernel config option CONFIG_SCSI_ENHANCED_UA. If this config option is not used, no new uevents are generated. There are some changes to kernel logging messages if CONFIG_SCSI_ENHANCED_UA is enabled, because the existing messages explicitly stated that the kernel did not do anything with the information. Note that checkpatch is reporting errors on patch 7/9 relating to macros in scsi_sysfs.c -- I believe these errors are incorrect and have sent a message to the checkpatch maintainer. The macros were derived from existing ones already in the file. Ewan D. Milne (9): [SCSI] Detect overflow of sense data buffer [SCSI] Generate uevent on sd capacity change [SCSI] Add a kernel config option for enhanced Unit Attention support [SCSI] Rename scsi_evt_xxx to sdev_evt_xxx and scsi_event to sdev_event [SCSI] Add support for scsi_target events [SCSI] Generate uevents for certain Unit Attention codes [SCSI] Add sysfs support for enhanced Unit Attention handling [SCSI] Add sense and Unit Attention generation to scsi_debug [SCSI] Streamline detection of FM/EOM/ILI status drivers/scsi/Kconfig | 12 +++ drivers/scsi/scsi_debug.c | 168 ++++++++++++++++++++++++++++++++++++++ drivers/scsi/scsi_error.c | 198 ++++++++++++++++++++++++++++++++++++++++----- drivers/scsi/scsi_lib.c | 178 +++++++++++++++++++++++++++++++++++++--- drivers/scsi/scsi_priv.h | 10 ++- drivers/scsi/scsi_scan.c | 54 ++++++------- drivers/scsi/scsi_sysfs.c | 148 ++++++++++++++++++++++++++++++--- drivers/scsi/sd.c | 9 +++ include/scsi/scsi_cmnd.h | 4 + include/scsi/scsi_device.h | 64 ++++++++++++++- include/scsi/scsi_eh.h | 7 ++ 11 files changed, 773 insertions(+), 79 deletions(-) -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
