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Change the default for the vfs.bdev_buffered sysctl to zero.

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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.
This commit is contained in:
phk 1999-10-18 16:59:50 +00:00
parent 1fb707135d
commit 6db574927e
2 changed files with 2 additions and 2 deletions
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2
sys/fs/specfs/spec_vnops.c
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@ -117,7 +117,7 @@ static struct vnodeopv_desc spec_vnodeop_opv_desc =
VNODEOP_SET(spec_vnodeop_opv_desc);
static int bdev_buffered = 1;
static int bdev_buffered = 0;
SYSCTL_INT(_vfs, OID_AUTO, bdev_buffered, CTLFLAG_RW, &bdev_buffered, 0, "");
static int enable_userblk_io = 1;

2
sys/miscfs/specfs/spec_vnops.c
View File

@ -117,7 +117,7 @@ static struct vnodeopv_desc spec_vnodeop_opv_desc =
VNODEOP_SET(spec_vnodeop_opv_desc);
static int bdev_buffered = 1;
static int bdev_buffered = 0;
SYSCTL_INT(_vfs, OID_AUTO, bdev_buffered, CTLFLAG_RW, &bdev_buffered, 0, "");
static int enable_userblk_io = 1;