diff options
Diffstat (limited to 'usr/src/uts/common/fs/vnode.c')
| -rw-r--r-- | usr/src/uts/common/fs/vnode.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/usr/src/uts/common/fs/vnode.c b/usr/src/uts/common/fs/vnode.c index 9e0b071999..c57884a940 100644 --- a/usr/src/uts/common/fs/vnode.c +++ b/usr/src/uts/common/fs/vnode.c @@ -21,7 +21,7 @@ /* * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2018, Joyent, Inc. + * Copyright 2020 Joyent, Inc. * Copyright 2016 Nexenta Systems, Inc. All rights reserved. * Copyright (c) 2011, 2017 by Delphix. All rights reserved. */ @@ -852,6 +852,37 @@ vn_rele(vnode_t *vp) mutex_exit(&vp->v_lock); } +void +vn_phantom_rele(vnode_t *vp) +{ + VERIFY(vp->v_count > 0); + + mutex_enter(&vp->v_lock); + VERIFY3U(vp->v_count, >=, vp->v_phantom_count); + vp->v_phantom_count--; + DTRACE_PROBE1(vn__phantom_rele, vnode_t *, vp); + if (vp->v_count == 1) { + ASSERT0(vp->v_phantom_count); + mutex_exit(&vp->v_lock); + VOP_INACTIVE(vp, CRED(), NULL); + return; + } + VN_RELE_LOCKED(vp); + mutex_exit(&vp->v_lock); +} + +/* + * Return the number of non-phantom holds. Things such as portfs will use + * phantom holds to prevent it from blocking filesystems from mounting over + * watched directories. + */ +uint_t +vn_count(vnode_t *vp) +{ + ASSERT(MUTEX_HELD(&vp->v_lock)); + return (vp->v_count - vp->v_phantom_count); +} + /* * Release a vnode referenced by the DNLC. Multiple DNLC references are treated * as a single reference, so v_count is not decremented until the last DNLC hold @@ -2428,6 +2459,7 @@ vn_reinit(vnode_t *vp) { vp->v_count = 1; vp->v_count_dnlc = 0; + vp->v_phantom_count = 0; vp->v_vfsp = NULL; vp->v_stream = NULL; vp->v_vfsmountedhere = NULL; @@ -2484,6 +2516,7 @@ vn_free(vnode_t *vp) */ ASSERT((vp->v_count == 0) || (vp->v_count == 1)); ASSERT(vp->v_count_dnlc == 0); + ASSERT0(vp->v_phantom_count); VERIFY(vp->v_path != NULL); if (vp->v_path != vn_vpath_empty) { kmem_free(vp->v_path, strlen(vp->v_path) + 1); |