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| author | KATO Takenori <kato@FreeBSD.org> | 1997-09-27 13:40:20 +0000 |
|---|---|---|
| committer | KATO Takenori <kato@FreeBSD.org> | 1997-09-27 13:40:20 +0000 |
| commit | 81bca6ddae8d2ed045ada4d1dc3d1ba214b5b364 (patch) | |
| tree | 531e60adf6f57225cae1ac4c6f4e5e93b5ecedc9 /sys/kern/kern_conf.c | |
| parent | a7eacb17d7e75d02d98b462ddf952a89738c8b7b (diff) | |
| download | src-81bca6ddae8d2ed045ada4d1dc3d1ba214b5b364.tar.gz src-81bca6ddae8d2ed045ada4d1dc3d1ba214b5b364.zip | |
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
Notes
Notes:
svn path=/head/; revision=29888
Diffstat (limited to 'sys/kern/kern_conf.c')
| -rw-r--r-- | sys/kern/kern_conf.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/sys/kern/kern_conf.c b/sys/kern/kern_conf.c index 103064826c74..fba334b897ef 100644 --- a/sys/kern/kern_conf.c +++ b/sys/kern/kern_conf.c @@ -30,7 +30,7 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * $Id: kern_conf.c,v 1.20 1997/09/21 22:14:54 julian Exp $ + * $Id: kern_conf.c,v 1.21 1997/09/21 22:20:12 julian Exp $ */ #include <sys/param.h> @@ -198,10 +198,12 @@ bdevsw_add_generic(int bdev, int cdev, struct bdevsw *bdevsw) /* * XXX hack alert. */ - if (isdisk(makedev(bdev, 0), VBLK) && bdevsw->d_flags != D_DISK) { + if (isdisk(makedev(bdev, 0), VBLK) && + (bdevsw->d_flags & D_TYPEMASK) != D_DISK) { printf("bdevsw_add_generic: adding D_DISK flag for device %d\n", bdev); - bdevsw->d_flags = D_DISK; + bdevsw->d_flags &= ~D_TYPEMASK; + bdevsw->d_flags |= D_DISK; } cdevsw_make(bdevsw); dev = makedev(cdev, 0); |