[src/trunk]: src/sys/rump/librump/rumpvfs Run vflush() when going from read/w...

[hannken <hannken%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/bac1ddfeb849
branches:  trunk
changeset: 350931:bac1ddfeb849
user:      hannken <hannken%NetBSD.org@localhost>
date:      Fri Jan 27 10:48:51 2017 +0000

description:
Run vflush() when going from read/write to read only.
Set link count to zero once a node has been removed.
"Implement" MNT_GETARGS.

diffstat:

 sys/rump/librump/rumpvfs/rumpfs.c |  31 ++++++++++++++++++++++++++++---
 1 files changed, 28 insertions(+), 3 deletions(-)

diffs (97 lines):

diff -r 09e2df69ba72 -r bac1ddfeb849 sys/rump/librump/rumpvfs/rumpfs.c
--- a/sys/rump/librump/rumpvfs/rumpfs.c Fri Jan 27 10:47:54 2017 +0000
+++ b/sys/rump/librump/rumpvfs/rumpfs.c Fri Jan 27 10:48:51 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rumpfs.c,v 1.142 2016/08/20 12:37:09 hannken Exp $     */
+/*     $NetBSD: rumpfs.c,v 1.143 2017/01/27 10:48:51 hannken Exp $     */
 
 /*
  * Copyright (c) 2009, 2010, 2011 Antti Kantee.  All Rights Reserved.
@@ -26,7 +26,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rumpfs.c,v 1.142 2016/08/20 12:37:09 hannken Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rumpfs.c,v 1.143 2017/01/27 10:48:51 hannken Exp $");
 
 #include <sys/param.h>
 #include <sys/atomic.h>
@@ -216,6 +216,7 @@
 
 struct rumpfs_mount {
        struct vnode *rfsmp_rvp;
+       bool rfsmp_rdonly;
 };
 
 #define INO_WHITEOUT 1
@@ -1012,6 +1013,7 @@
        freedir(rnd, cnp);
        rn->rn_flags |= RUMPNODE_CANRECLAIM;
        rn->rn_parent = NULL;
+       rn->rn_va.va_nlink = 0;
 
 out:
        vput(dvp);
@@ -1040,6 +1042,7 @@
 
        freedir(rnd, cnp);
        rn->rn_flags |= RUMPNODE_CANRECLAIM;
+       rn->rn_va.va_nlink = 0;
 
        vput(dvp);
        vput(vp);
@@ -1803,6 +1806,7 @@
        }
 
        rfsmp->rfsmp_rvp->v_vflag |= VV_ROOT;
+       rfsmp->rfsmp_rdonly = (mp->mnt_flag & MNT_RDONLY) != 0;
 
        mp->mnt_data = rfsmp;
        mp->mnt_stat.f_namemax = RUMPFS_MAXNAMLEN;
@@ -1818,9 +1822,27 @@
 int
 rumpfs_mount(struct mount *mp, const char *mntpath, void *arg, size_t *alen)
 {
-       int error;
+       struct rumpfs_mount *rfsmp = mp->mnt_data;
+       int error, flags;
 
+       if (mp->mnt_flag & MNT_GETARGS) {
+               return 0;
+       }
        if (mp->mnt_flag & MNT_UPDATE) {
+               if (!rfsmp->rfsmp_rdonly && (mp->mnt_flag & MNT_RDONLY)) {
+                       /* Changing from read/write to read-only. */
+                       flags = WRITECLOSE;
+                       if ((mp->mnt_flag & MNT_FORCE))
+                               flags |= FORCECLOSE;
+                       error = vflush(mp, NULL, flags);
+                       if (error)
+                               return error;
+                       rfsmp->rfsmp_rdonly = true;
+               }
+               if (rfsmp->rfsmp_rdonly && (mp->mnt_flag & IMNT_WANTRDWR)) {
+                       /* Changing from read-only to read/write. */
+                       rfsmp->rfsmp_rdonly = false;
+               }
                return 0;
        }
 
@@ -1944,6 +1966,7 @@
 rumpfs_mountroot()
 {
        struct mount *mp;
+       struct rumpfs_mount *rfsmp;
        int error;
 
        if ((error = vfs_rootmountalloc(MOUNT_RUMPFS, "rootdev", &mp)) != 0) {
@@ -1961,7 +1984,9 @@
        if (error)
                panic("set_statvfs_info failed for rootfs: %d", error);
 
+       rfsmp = mp->mnt_data;
        mp->mnt_flag &= ~MNT_RDONLY;
+       rfsmp->rfsmp_rdonly = false;
        vfs_unbusy(mp, false, NULL);
 
        return 0;