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From 81d05d6fb3b79e572064f57e1f8185d3b16149dc Mon Sep 17 00:00:00 2001
From: Marc Dionne <marc.dionne@your-file-system.com>
Date: Wed, 29 Jul 2015 09:03:14 -0300
Subject: [PATCH 6/6] Linux: Only use automount for volume roots
As long as we avoid using directory aliases when crossing
a mount point (at the volume root), we should always get
to a given non root directory with the same dentry.
The mechanism added by commit de381aa0 ("Linux: Make dir
dentry aliases act like symlinks") is therefore only really
necessary for a volume root.
With kernel 4.2 it is not possible to tweak the "total link
count", resulting in ELOOP errors when looking up a path
with 40 or more directories that are being looked up for
the first time. With this change, only mountpoints will
count against the limit.
Reviewed-on: http://gerrit.openafs.org/11945
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Daria Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
(cherry picked from commit 05f64de7d723a8d5430d9b5928c2025838a6fa52)
Change-Id: I16e855c8322174604288b7d440b342951dd3a015
---
src/afs/LINUX/osi_vnodeops.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/afs/LINUX/osi_vnodeops.c b/src/afs/LINUX/osi_vnodeops.c
index 3c0cb33..ae0513c 100644
--- a/src/afs/LINUX/osi_vnodeops.c
+++ b/src/afs/LINUX/osi_vnodeops.c
@@ -1555,7 +1555,9 @@ afs_linux_lookup(struct inode *dip, struct dentry *dp)
d_prune_aliases(ip);
#ifdef STRUCT_DENTRY_OPERATIONS_HAS_D_AUTOMOUNT
- ip->i_flags |= S_AUTOMOUNT;
+ /* Only needed if this is a volume root */
+ if (vcp->mvstat == 2)
+ ip->i_flags |= S_AUTOMOUNT;
#endif
}
/*
--
2.5.1
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