This is a note to let you know that I've just added the patch titled
don't bother with propagate_mnt() unless the target is shared
to the 3.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
don-t-bother-with-propagate_mnt-unless-the-target-is-shared.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0b1b901b5a98bb36943d10820efc796f7cd45ff3 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Fri, 21 Mar 2014 10:14:08 -0400
Subject: don't bother with propagate_mnt() unless the target is shared
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
commit 0b1b901b5a98bb36943d10820efc796f7cd45ff3 upstream.
If the dest_mnt is not shared, propagate_mnt() does nothing -
there's no mounts to propagate to and thus no copies to create.
Might as well don't bother calling it in that case.
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/namespace.c | 17 +++++++----------
1 file changed, 7 insertions(+), 10 deletions(-)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1653,16 +1653,14 @@ static int attach_recursive_mnt(struct m
err = invent_group_ids(source_mnt, true);
if (err)
goto out;
- }
- err = propagate_mnt(dest_mnt, dest_mp, source_mnt, &tree_list);
- if (err)
- goto out_cleanup_ids;
-
- lock_mount_hash();
-
- if (IS_MNT_SHARED(dest_mnt)) {
+ err = propagate_mnt(dest_mnt, dest_mp, source_mnt, &tree_list);
+ if (err)
+ goto out_cleanup_ids;
+ lock_mount_hash();
for (p = source_mnt; p; p = next_mnt(p, source_mnt))
set_mnt_shared(p);
+ } else {
+ lock_mount_hash();
}
if (parent_path) {
detach_mnt(source_mnt, parent_path);
@@ -1685,8 +1683,7 @@ static int attach_recursive_mnt(struct m
return 0;
out_cleanup_ids:
- if (IS_MNT_SHARED(dest_mnt))
- cleanup_group_ids(source_mnt, NULL);
+ cleanup_group_ids(source_mnt, NULL);
out:
return err;
}
Patches currently in stable-queue which might be from viro@xxxxxxxxxxxxxxxxxx are
queue-3.13/don-t-bother-with-propagate_mnt-unless-the-target-is-shared.patch
queue-3.13/resizable-namespace.c-hashes.patch
queue-3.13/switch-mnt_hash-to-hlist.patch
queue-3.13/rcuwalk-recheck-mount_lock-after-mountpoint-crossing-attempts.patch
queue-3.13/keep-shadowed-vfsmounts-together.patch
queue-3.13/make-prepend_name-work-correctly-when-called-with-negative-buflen.patch
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