Add a flags parameter to VFS_VGET to pass through the desired

locking flags when acquiring a vnode. The immediate purpose is
to allow polling lock requests (LK_NOWAIT) needed by soft updates
to avoid deadlock when enlisting other processes to help with
the background cleanup. For the future it will allow the use of
shared locks for read access to vnodes. This change touches a
lot of files as it affects most filesystems within the system.
It has been well tested on FFS, loopback, and CD-ROM filesystems.
only lightly on the others, so if you find a problem there, please
let me (mckusick@mckusick.com) know.

1 files changed, 4 insertions, 3 deletions

diff --git a/sys/fs/umapfs/umap_vfsops.c b/sys/fs/umapfs/umap_vfsops.c
index a22b8df..17bfdc1 100644
--- a/sys/fs/umapfs/umap_vfsops.c
+++ b/sys/fs/umapfs/umap_vfsops.c
@@ -73,7 +73,7 @@ static int	umapfs_sync __P((struct mount *mp, int waitfor,
 				 struct ucred *cred, struct thread *td));
 static int	umapfs_unmount __P((struct mount *mp, int mntflags,
 				    struct thread *td));
-static int	umapfs_vget __P((struct mount *mp, ino_t ino,
+static int	umapfs_vget __P((struct mount *mp, ino_t ino, int flags,
 				 struct vnode **vpp));
 static int	umapfs_vptofh __P((struct vnode *vp, struct fid *fhp));
 static int	umapfs_extattrctl __P((struct mount *mp, int cmd,
@@ -387,13 +387,14 @@ umapfs_sync(mp, waitfor, cred, td)
 }
 
 static int
-umapfs_vget(mp, ino, vpp)
+umapfs_vget(mp, ino, flags, vpp)
 	struct mount *mp;
 	ino_t ino;
+	int flags;
 	struct vnode **vpp;
 {
 
-	return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp));
+	return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, flags, vpp));
 }
 
 static int