freebsd-dev/sys/fs/specfs
Poul-Henning Kamp 8342096f29 Change the default for the vfs.bdev_buffered sysctl to zero.
This means that access to block devices nodes will act the
same as char device nodes for disk-like devices.

If you encounter problems after this, where programs accessing
disks directly fail to operate, please use the following command
to revert to previous behaviour:

        sysctl -w vfs.bdev_buffered=1

And verify that this was indeed the cause of your trouble.

See the mail-archives of the arch@FreeBSD.org list for background.
1999-10-18 16:59:50 +00:00
..
spec_vnops.c Change the default for the vfs.bdev_buffered sysctl to zero. 1999-10-18 16:59:50 +00:00