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Linux: Only use automount for volume roots

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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 05f64de7d7)

Change-Id: I16e855c8322174604288b7d440b342951dd3a015
Reviewed-on: http://gerrit.openafs.org/11989
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
This commit is contained in:
Marc Dionne 2015-07-29 09:03:14 -03:00 committed by Stephan Wiesand
parent b93da6f3e9
commit feab09080e
1 changed files with 3 additions and 1 deletions
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4
src/afs/LINUX/osi_vnodeops.c
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@ -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
}
/*