From 597cee37df5aa788ec64acb3a9802ae6668615ef Mon Sep 17 00:00:00 2001
From: vangyzen <vangyzen@FreeBSD.org>
Date: Tue, 2 Jun 2015 18:37:04 +0000
Subject: Provide vnode in memory map info for files on tmpfs
When providing memory map information to userland, populate the vnode pointer
for tmpfs files. Set the memory mapping to appear as a vnode type, to match
FreeBSD 9 behavior.
This fixes the use of tmpfs files with the dtrace pid provider,
procstat -v, procfs, linprocfs, pmc (pmcstat), and ptrace (PT_VM_ENTRY).
Submitted by: Eric Badger <eric@badgerio.us> (initial revision)
Obtained from: Dell Inc.
PR: 198431
MFC after: 2 weeks
Reviewed by: jhb
Approved by: kib (mentor)
---
sys/fs/procfs/procfs_map.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
(limited to 'sys/fs/procfs/procfs_map.c')
diff --git a/sys/fs/procfs/procfs_map.c b/sys/fs/procfs/procfs_map.c
index eae70229..b00aac3 100644
--- a/sys/fs/procfs/procfs_map.c
+++ b/sys/fs/procfs/procfs_map.c
@@ -159,11 +159,11 @@ procfs_doprocmap(PFS_FILL_ARGS)
freepath = NULL;
fullpath = "-";
if (lobj) {
+ vp = NULL;
switch (lobj->type) {
default:
case OBJT_DEFAULT:
type = "default";
- vp = NULL;
break;
case OBJT_VNODE:
type = "vnode";
@@ -171,13 +171,19 @@ procfs_doprocmap(PFS_FILL_ARGS)
vref(vp);
break;
case OBJT_SWAP:
- type = "swap";
- vp = NULL;
+ if ((lobj->flags & OBJ_TMPFS_NODE) != 0) {
+ type = "vnode";
+ if ((lobj->flags & OBJ_TMPFS) != 0) {
+ vp = lobj->un_pager.swp.swp_tmpfs;
+ vref(vp);
+ }
+ } else {
+ type = "swap";
+ }
break;
case OBJT_SG:
case OBJT_DEVICE:
type = "device";
- vp = NULL;
break;
}
if (lobj != obj)
--
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