diff options
| author | kato <kato@FreeBSD.org> | 1997-09-27 13:40:20 +0000 |
|---|---|---|
| committer | kato <kato@FreeBSD.org> | 1997-09-27 13:40:20 +0000 |
| commit | fe9b86cf0b7a453c772a2756389fda91c12c3fab (patch) | |
| tree | e695260038ca9665181b5b5c99ae6fa77fba443a /sys/dev/vn | |
| parent | 31e1d6ad00b9d8f39549115d4ef76fbee62e9748 (diff) | |
| download | FreeBSD-src-fe9b86cf0b7a453c772a2756389fda91c12c3fab.zip FreeBSD-src-fe9b86cf0b7a453c772a2756389fda91c12c3fab.tar.gz | |
Clustered read and write are switched at mount-option level.
1. Clustered I/O is switched by the MNT_NOCLUSTERR and MNT_NOCLUSTERW
bits of the mnt_flag. The sysctl variables, vfs.foo.doclusterread
and vfs.foo.doclusterwrite are deleted. Only mount option can
control clustered I/O from userland.
2. When foofs_mount mounts block device, foofs_mount checks D_CLUSTERR
and D_CLUSTERW bits of the d_flags member in the block device switch
table. If D_NOCLUSTERR / D_NOCLUSTERW are set, MNT_NOCLUSTERR /
MNT_NOCLUSTERW bits will be set. In this case, MNT_NOCLUSTERR and
MNT_NOCLUSTERW cannot be cleared from userland.
3. Vnode driver disables both clustered read and write.
4. Union filesystem disables clutered write.
Reviewed by: bde
Diffstat (limited to 'sys/dev/vn')
| -rw-r--r-- | sys/dev/vn/vn.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/sys/dev/vn/vn.c b/sys/dev/vn/vn.c index 6cb4856..d851d2a 100644 --- a/sys/dev/vn/vn.c +++ b/sys/dev/vn/vn.c @@ -38,7 +38,7 @@ * from: Utah Hdr: vn.c 1.13 94/04/02 * * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 - * $Id: vn.c,v 1.48 1997/06/14 13:56:09 bde Exp $ + * $Id: vn.c,v 1.49 1997/08/14 13:44:19 kato Exp $ */ /* @@ -101,8 +101,8 @@ static d_strategy_t vnstrategy; #define BDEV_MAJOR 15 static struct cdevsw vn_cdevsw; static struct bdevsw vn_bdevsw = - { vnopen, vnclose, vnstrategy, vnioctl, /*15*/ - vndump, vnsize, D_DISK, "vn", &vn_cdevsw, -1 }; + { vnopen, vnclose, vnstrategy, vnioctl, /*15*/ + vndump, vnsize, D_DISK | D_NOCLUSTERRW, "vn", &vn_cdevsw, -1 }; #ifdef DEBUG |
