Module Name: src
Committed By: hannken
Date: Sat Feb 22 10:05:54 UTC 2014
Modified Files:
src/share/man/man9: vfssubr.9
Log Message:
Update the description of vfs_busy() and vfs_unbusy().
To generate a diff of this commit:
cvs rdiff -u -r1.20 -r1.21 src/share/man/man9/vfssubr.9
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/share/man/man9/vfssubr.9
diff -u src/share/man/man9/vfssubr.9:1.20 src/share/man/man9/vfssubr.9:1.21
--- src/share/man/man9/vfssubr.9:1.20 Thu Dec 2 12:54:13 2010
+++ src/share/man/man9/vfssubr.9 Sat Feb 22 10:05:54 2014
@@ -1,4 +1,4 @@
-.\" $NetBSD: vfssubr.9,v 1.20 2010/12/02 12:54:13 wiz Exp $
+.\" $NetBSD: vfssubr.9,v 1.21 2014/02/22 10:05:54 hannken Exp $
.\"
.\" Copyright (c) 2003, 2005, 2006 The NetBSD Foundation, Inc.
.\" All rights reserved.
@@ -27,7 +27,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd May 9, 2009
+.Dd February 22, 2014
.Dt VFSSUBR 9
.Os
.Sh NAME
@@ -74,9 +74,9 @@
.Ft void
.Fn vfs_unmountall "struct lwp *l"
.Ft int
-.Fn vfs_busy "struct mount *mp" "int flags" "struct simplelock *interlkp"
+.Fn vfs_busy "struct mount *mp" "struct mount **nextp"
.Ft void
-.Fn vfs_unbusy "struct mount *mp"
+.Fn vfs_unbusy "struct mount *mp" "bool keepref" "struct mount **nextp"
.Ft struct mount *
.Fn vfs_mountalloc "struct vfsops *vfs" "struct vnode *vp"
.Ft int
@@ -130,17 +130,38 @@ by the vnode
Mount the root file system.
.It Fn vfs_unmountall "l"
Unmount all file systems.
-.It Fn vfs_busy "mp" "flags" "interlkp"
+.It Fn vfs_busy "mp" "nextp"
Mark the mount point specified by
.Fa mp
-as busy.
+as busy and get a reference to it.
This function is used to synchronize access and to delay unmounting.
-The interlock specified by argument
-.Fa interlkp
-is not released on failure.
-.It Fn vfs_unbusy "mp"
-Free the busy file system specified by the mount structure
+The caller must hold a pre-existing reference to the mount.
+If
+.Fa nextp
+is not NULL, the caller must hold the
+.Em mountlist_lock
+and
+.Fa nextp
+will receive the next mount from mount list on error.
+The
+.Em mountlist_lock
+is released on return.
+.It Fn vfs_unbusy "mp" "keepref" "nextp"
+Undo a
+.Fn vfs_busy
+on the mount point specified by
.Fa mp .
+If
+.Fa keepref
+is true, preserve the reference added by
+.Fn vfs_busy .
+If
+.Fa nextp
+is not NULL, the
+.Em mountlist_lock
+will be aquired and
+.Fa nextp
+will receive the next mount from mount list.
.It Fn vfs_mountalloc "vfsops" "vp"
Allocate and initialise a mount structure, setting
.Em mnt_vnodecovered
