Date: Tue, 26 Oct 2010 19:46:00 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: Ryan Stone <rysto32@gmail.com> Cc: freebsd-scsi@freebsd.org Subject: Re: camcontrol rescan all fails if there is no bus 0 Message-ID: <4CC705C8.9050604@icyb.net.ua> In-Reply-To: <AANLkTiksEn2DP7Y=x=u99qcf28bBEspOWRnsWUfhaOPg@mail.gmail.com> References: <AANLkTiksEn2DP7Y=x=u99qcf28bBEspOWRnsWUfhaOPg@mail.gmail.com>
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on 25/10/2010 19:59 Ryan Stone said the following: > If you issue a "camcontrol rescan all" on a system that does not have > scsi bus 0, camcontrol gets a EINVAL from a CAMIOCOMMAND ioctl and > exits after printing an error while trying to do a XPT_DEV_MATCH. > This is because camcontrol passes a bzero'd ccb to the ioctl without > ever setting the path_id, so CAM looks up path 0 and returns EINVAL if > that bus does not exist. > > This is just slightly annoying if there are no CAM devices on the > system. If you had a system with CAM devices, but no bus 0, then > camcontrol rescan all would always fail. I'm not sure if it's > actually possible to skip path 0, though. Oh, I remember this issue: http://thread.gmane.org/gmane.os.freebsd.devel.scsi/4405 > The following patch resolves the issue for me: > Index: camcontrol.c > =================================================================== > --- camcontrol.c (revision 214271) > +++ camcontrol.c (working copy) > @@ -1519,6 +1519,7 @@ rescan_or_reset_bus(int bus, int rescan) > bzero(&(&matchccb.ccb_h)[1], > sizeof(struct ccb_dev_match) - sizeof(struct ccb_hdr)); > matchccb.ccb_h.func_code = XPT_DEV_MATCH; > + matchccb.ccb_h.path_id = CAM_BUS_WILDCARD; > bufsize = sizeof(struct dev_match_result) * 20; > matchccb.cdm.match_buf_len = bufsize; > matchccb.cdm.matches=(struct dev_match_result *)malloc(bufsize); > > > (by the way, should I be using CAM_BUS_WILDCARD or CAM_XPT_PATH_ID? > By the name WILDCARD seems more appropriate but I see that camcontrol > uses CAM_XPT_PATH_ID in getdevtree. -- Andriy Gapon
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