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| 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/sys/conf.h | |
| 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/sys/conf.h')
| -rw-r--r-- | sys/sys/conf.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/sys/sys/conf.h b/sys/sys/conf.h index 0a7e323..194bfd9 100644 --- a/sys/sys/conf.h +++ b/sys/sys/conf.h @@ -36,7 +36,7 @@ * SUCH DAMAGE. * * @(#)conf.h 8.5 (Berkeley) 1/9/95 - * $Id: conf.h,v 1.34 1997/02/22 09:44:58 peter Exp $ + * $Id: conf.h,v 1.35 1997/09/14 02:25:40 peter Exp $ */ #ifndef _SYS_CONF_H_ @@ -85,6 +85,15 @@ typedef int l_modem_t __P((struct tty *tp, int flag)); #define D_DISK 2 #define D_TTY 3 +#define D_TYPEMASK 0xffff + +/* + * Flags for d_flags. + */ +#define D_NOCLUSTERR 0x10000 /* disables cluter read */ +#define D_NOCLUSTERW 0x20000 /* disables cluster write */ +#define D_NOCLUSTERRW (D_NOCLUSTERR | D_NOCLUSTERW) + /* * Block device switch table */ @@ -95,7 +104,7 @@ struct bdevsw { d_ioctl_t *d_ioctl; d_dump_t *d_dump; d_psize_t *d_psize; - int d_flags; + u_int d_flags; char *d_name; /* name of the driver e.g. audio */ struct cdevsw *d_cdev; /* cross pointer to the cdev */ int d_maj; /* the major number we were assigned */ |
