Date: Thu, 26 Aug 1999 18:27:14 -0500 From: "Pillai, Girish" <Girish_Pillai@bmc.com> To: "'Matthew Dillon'" <dillon@apollo.backplane.com>, Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: Christopher Masto <chris@netmonger.net>, grog@FreeBSD.ORG, "John W. DeBoskey" <jwd@unx.sas.com>, julian@whistle.com, freebsd-current@FreeBSD.ORG Subject: RE: -current kernel problems (spec_getpages & vm_fault) Message-ID: <B6200F7A96BCD211864900A0C9D8173803314FF1@es01-hou.bmc.com>
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-----Original Message-----
From: Matthew Dillon [mailto:dillon@apollo.backplane.com]
Sent: Thursday, August 26, 1999 6:25 PM
To: Poul-Henning Kamp
Cc: Christopher Masto; grog@FreeBSD.ORG; John W. DeBoskey;
julian@whistle.com; freebsd-current@FreeBSD.ORG
Subject: Re: -current kernel problems (spec_getpages & vm_fault)
:>> int devminor; /* minor number
*/
:>>
:>> devminor = minor(dev);
:>> + dev->si_bsize_phys = DEV_BSIZE;
:>> + dev->si_bsize_best = BLKDEV_IOSIZE;
:>> + dev->si_bsize_max = MAXBSIZE;
:>
:>Bingo! Thank you.
:
:Cool, I expect grog will commit it soon.
:
:--
:Poul-Henning Kamp FreeBSD coreteam member
:phk@FreeBSD.ORG "Real hackers run -current on their laptop."
The patch for ccd is not quite right. Here is the patch from my big fat
patch
at http://www.backplane.com/FreeBSD4/
The problem is that you cannot simply set the physical sector size
to DEV_BSIZE if the underlying device has a larger sector size. If
you do, specfs's blocksize alignment (another fix in my big fat patch)
will be incorrect and result in an I/O error on the physical media.
For example, swap-backed VN devices have a sector size of one page,
i.e. 4K.
-Matt
Matthew Dillon
<dillon@backplane.com>
Index: ccd.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/ccd/ccd.c,v
retrieving revision 1.53
diff -u -r1.53 ccd.c
--- ccd.c 1999/08/26 14:46:10 1.53
+++ ccd.c 1999/08/26 23:22:43
@@ -1417,6 +1417,12 @@
lp->d_ncylinders = ccg->ccg_ncylinders;
lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;
+ dev->si_bsize_phys = lp->d_secsize;
+ dev->si_bsize_best = BLKDEV_IOSIZE;
+ dev->si_bsize_max = MAXBSIZE;
+ if (dev->si_bsize_best < lp->d_secsize)
+ dev->si_bsize_best = lp->d_secsize;
+
strncpy(lp->d_typename, "ccd", sizeof(lp->d_typename));
lp->d_type = DTYPE_CCD;
strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname));
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