Date: Mon, 30 Apr 2001 07:35:37 -0700 (PDT) From: Bruce Evans <bde@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/miscfs/specfs spec_vnops.c Message-ID: <200104301435.f3UEZbX08864@freefall.freebsd.org>
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bde 2001/04/30 07:35:37 PDT
Modified files:
sys/miscfs/specfs spec_vnops.c
Log:
Backed out previous commit. It cause massive filesystem corruption,
not to mention a compile-time warning about the critical function
becoming unused, by replacing spec_bmap() with vop_stdbmap().
ntfs seems to have the same bug.
The factor for converting specfs block numbers to physical block
numbers is 1, but vop_stdbmap() uses the bogus factor
btodb(ap->a_vp->v_mount->mnt_stat.f_iosize), which is 16 for ffs with
the default block size of 8K. This factor is bogus even for vop_stdbmap()
-- the correct factor is related to the filesystem blocksize which is not
necessarily the same to the optimal i/o size. vop_stdbmap() was apparently
cloned from nfs where these sizes happen to be the same.
There may also be a problem with a_vp->v_mount being null. spec_bmap()
still checks for this, but I think the checks in specfs are dead code
which used to support block devices.
Revision Changes Path
1.157 +2 -1 src/sys/miscfs/specfs/spec_vnops.c
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