Hi Christophe, hi Ben, the bulk of this series attempts to avoid unnecessary I/O for "multipath -u" calls from udev rules. I came up with it in a recent attempt to debug avoid "multipath -u" hangups during boot. I found that the detect_alua() call in the get_refwwid->pathinfo->scsi_ioctl_pathinfo call sequence would cause an sg ioctl to be sent for every "multipath -u" invocation. That's obvious nonsense, we don't need to detect ALUA capabilities to find out if a device is a potential multipath member. So, rather than setting pp->tpgs in pathinfo, I resorted to a "lazy" approach where ALUA capabilities are probed when they are needed, no sooner. I also cleaned up the ALUA code a bit (still some more to go), and made it attempt to read INQUIRY data from sysfs (this is fine for the ALUA prioritizer - it only needs to bypass sysfs for the RTPG calls). Martin Wilck (9): libmultipath: add sysfs_get_inquiry() libmultipath: alua: make API more consistent libmultipath: alua: try to retrieve inquiry data from sysfs libmultipath: constify sysfs_get_timeout() libmultipath: detect_alua(): use system timeout libmultipath: lazy tpgs probing libmultipath: don't link alua_rtpg.o twice libmultipath: check_rdac(): pre-check in hwtable libmultipath: hwtable: add Lenovo DE series libmultipath/discovery.c | 46 +++++++++++++++++++-------- libmultipath/discovery.h | 10 +++--- libmultipath/hwtable.c | 20 ++++++++++++ libmultipath/prioritizers/Makefile | 3 -- libmultipath/prioritizers/alua.c | 4 +-- libmultipath/prioritizers/alua_rtpg.c | 45 ++++++++++++++++++++------ libmultipath/prioritizers/alua_rtpg.h | 7 ++-- libmultipath/propsel.c | 31 ++++++++++++------ multipathd/main.c | 7 ++-- 9 files changed, 126 insertions(+), 47 deletions(-) -- 2.21.0 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
