Author: kib
Date: Sat Oct 4 18:28:27 2014
New Revision: 272534
URL: https://svnweb.freebsd.org/changeset/base/272534
Log:
Add IO_RANGELOCKED flag for vn_rdwr(9), which specifies that vnode is
not locked, but range is.
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Modified:
head/sys/kern/vfs_vnops.c
head/sys/sys/vnode.h
Modified: head/sys/kern/vfs_vnops.c
==============================================================================
--- head/sys/kern/vfs_vnops.c Sat Oct 4 18:00:15 2014 (r272533)
+++ head/sys/kern/vfs_vnops.c Sat Oct 4 18:28:27 2014 (r272534)
@@ -504,13 +504,16 @@ vn_rdwr(enum uio_rw rw, struct vnode *vp
error = 0;
if ((ioflg & IO_NODELOCKED) == 0) {
- if (rw == UIO_READ) {
- rl_cookie = vn_rangelock_rlock(vp, offset,
- offset + len);
- } else {
- rl_cookie = vn_rangelock_wlock(vp, offset,
- offset + len);
- }
+ if ((ioflg & IO_RANGELOCKED) == 0) {
+ if (rw == UIO_READ) {
+ rl_cookie = vn_rangelock_rlock(vp, offset,
+ offset + len);
+ } else {
+ rl_cookie = vn_rangelock_wlock(vp, offset,
+ offset + len);
+ }
+ } else
+ rl_cookie = NULL;
mp = NULL;
if (rw == UIO_WRITE) {
if (vp->v_type != VCHR &&
Modified: head/sys/sys/vnode.h
==============================================================================
--- head/sys/sys/vnode.h Sat Oct 4 18:00:15 2014 (r272533)
+++ head/sys/sys/vnode.h Sat Oct 4 18:28:27 2014 (r272534)
@@ -305,6 +305,7 @@ struct vattr {
#define IO_NORMAL 0x0800 /* operate on regular data */
#define IO_NOMACCHECK 0x1000 /* MAC checks unnecessary */
#define IO_BUFLOCKED 0x2000 /* ffs flag; indir buf is
locked */
+#define IO_RANGELOCKED 0x4000 /* range locked */
#define IO_SEQMAX 0x7F /* seq heuristic max value */
#define IO_SEQSHIFT 16 /* seq heuristic in upper 16 bits */
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