diff options
Diffstat (limited to 'usr/src/uts/common/sys/buf.h')
| -rw-r--r-- | usr/src/uts/common/sys/buf.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/usr/src/uts/common/sys/buf.h b/usr/src/uts/common/sys/buf.h index a9191aed7c..cb8a6012fc 100644 --- a/usr/src/uts/common/sys/buf.h +++ b/usr/src/uts/common/sys/buf.h @@ -21,6 +21,7 @@ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. + * Copyright 2012 Joyent, Inc. All rights reserved. */ /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ @@ -186,6 +187,7 @@ struct biostats { #define B_STARTED 0x2000000 /* io:::start probe called for buf */ #define B_ABRWRITE 0x4000000 /* Application based recovery active */ #define B_PAGE_NOWAIT 0x8000000 /* Skip the page if it is locked */ +#define B_INVALCURONLY 0x10000000 /* invalidate only for curproc */ /* * There is some confusion over the meaning of B_FREE and B_INVAL and what @@ -198,6 +200,12 @@ struct biostats { * between the sole use of these two flags. In both cases, IO will be done * if the page is not yet committed to storage. * + * The B_INVALCURONLY flag modifies the behavior of the B_INVAL flag and is + * intended to be used in conjunction with B_INVAL. B_INVALCURONLY has no + * meaning on its own. When both B_INVALCURONLY and B_INVAL are set, then + * the mapping for the page is only invalidated for the current process. + * In this case, the page is not destroyed unless this was the final mapping. + * * In order to discard pages without writing them back, (B_INVAL | B_TRUNC) * should be used. * |