xnu-2782.1.97.tar.gz

[apple/xnu.git] / bsd / hfs / hfs_notification.c

diff --git a/bsd/hfs/hfs_notification.c b/bsd/hfs/hfs_notification.c
index c63d6307a8911a08f94ccc54a8bfd6081c181f11..621c58de56ccd501321d2498e98d8c1f3a95bcda 100644 (file)
--- a/bsd/hfs/hfs_notification.c
+++ b/bsd/hfs/hfs_notification.c
@@ -83,16 +83,21 @@ void hfs_generate_volume_notifications(struct hfsmount *hfsmp)
                printf("hfs: set VeryLowDisk: vol:%s, freeblks:%d, dangerlimit:%d\n", hfsmp->vcbVN, freeblks, hfsmp->hfs_freespace_notify_dangerlimit);
 
 #if HFS_SPARSE_DEV
-               if (hfsmp->hfs_flags & HFS_HAS_SPARSE_DEVICE) {
-                       if (hfsmp->hfs_backingfs_rootvp) {
-                               struct mount *mp = vnode_mount (hfsmp->hfs_backingfs_rootvp);
-                               /* If we're a sparse device, dump some info about the backing store... */
-                               if (mp) {                                       
-                                       printf("hfs: set VeryLowDisk: vol:%s, backingstore b_avail:%lld, tag:%d\n", hfsmp->vcbVN, mp->mnt_vfsstat.f_bavail, hfsmp->hfs_backingfs_rootvp->v_tag);
-                               }
-                       }
+               // If we're a sparse device, dump some info about the backing store..
+               hfs_lock_mount(hfsmp);
+               vnode_t backing_vp = hfsmp->hfs_backingfs_rootvp;
+               if (backing_vp && vnode_get(backing_vp) != 0)
+                       backing_vp = NULL;
+               hfs_unlock_mount(hfsmp);
+
+               if (backing_vp) {
+                       struct mount *mp = vnode_mount(backing_vp);
+                       printf("hfs: set VeryLowDisk: vol:%s, backingstore b_avail:%lld, tag:%d\n", 
+                                  hfsmp->vcbVN, mp->mnt_vfsstat.f_bavail, backing_vp->v_tag);
+                       vnode_put(backing_vp);
                }
 #endif
+
                hfsmp->hfs_notification_conditions |= (VQ_VERYLOWDISK|VQ_LOWDISK);
                vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
        } else if (state == 1) {