[rt] fix conflict between the security restrictions on links and rt

Instead of fixing aufs I disabled it for the rt feature set as it's only
needed for the installer.

svn path=/dists/sid/linux-2.6/; revision=18814

debian/changelog

@@ -2,7 +2,9 @@ linux-2.6 (3.2.9-2) UNRELEASED; urgency=low
 
   [ Uwe Kleine-König ]
   * [rt] bump rt patch to version 3.2.9-rt17
-  
+  * [rt] fix conflict between the security restrictions on links introduced in
+    3.2.9-1 and rt (Closes: #663269)
+
   [ Aurelien Jarno ]
   * [mips,mipsel] Mark ext4-modules as provided by the kernel-image udeb.
 

debian/config/featureset-rt/config

@@ -3,3 +3,6 @@ CONFIG_PREEMPT_RT_FULL=y
 CONFIG_SCHED_TRACER=y
 CONFIG_MISSED_TIMER_OFFSETS_HIST=y
 CONFIG_WAKEUP_LATENCY_HIST=y
+
+## disable aufs as it's not needed on rt and conflicts with fs-dentry-use-seqlock.patch
+# CONFIG_AUFS_FS is not set

debian/patches/features/all/rt/fix-rt+link-creation-restrictions

@@ -0,0 +1,22 @@
+---
+ fs/namei.c |    4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/fs/namei.c
++++ b/fs/namei.c
+@@ -679,13 +679,13 @@
+ 		return 0;
+ 
+ 	/* Check parent directory mode and owner. */
+-	spin_lock(&dentry->d_lock);
++	seq_spin_lock(&dentry->d_lock);
+ 	parent = dentry->d_parent->d_inode;
+ 	if ((parent->i_mode & (S_ISVTX|S_IWOTH)) == (S_ISVTX|S_IWOTH) &&
+ 	    parent->i_uid != inode->i_uid) {
+ 		error = -EACCES;
+ 	}
+-	spin_unlock(&dentry->d_lock);
++	seq_spin_unlock(&dentry->d_lock);
+ 
+ 	if (error)
+ 		audit_log_link_denied("follow_link", link);

debian/patches/features/all/rt/staging-pohmelfs-convert-struct-fs-lock-usage-to-.patch

@@ -0,0 +1,54 @@
+From 0bf0d69e1a358e93e5c9b256bb18cab4041e7d8f Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>
+Date: Sun, 11 Mar 2012 17:14:22 +0100
+Subject: [PATCH RT] staging/pohmelfs: convert struct fs->lock usage to seq_spin_{,un}lock
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This fixes:
+
+	drivers/staging/pohmelfs/path_entry.c:47:2: warning: passing argument 1 of ‘rt_spin_lock’ from incompatible pointer type [enabled by default]
+	include/linux/spinlock_rt.h:19:56: note: expected ‘struct spinlock_t *’ but argument is of type ‘struct seqlock_t *’
+	drivers/staging/pohmelfs/path_entry.c:49:2: warning: passing argument 1 of ‘rt_spin_unlock’ from incompatible pointer type [enabled by default]
+	include/linux/spinlock_rt.h:22:56: note: expected ‘struct spinlock_t *’ but argument is of type ‘struct seqlock_t *’
+	drivers/staging/pohmelfs/path_entry.c:95:2: warning: passing argument 1 of ‘rt_spin_lock’ from incompatible pointer type [enabled by default]
+	include/linux/spinlock_rt.h:19:56: note: expected ‘struct spinlock_t *’ but argument is of type ‘struct seqlock_t *’
+	drivers/staging/pohmelfs/path_entry.c:97:2: warning: passing argument 1 of ‘rt_spin_unlock’ from incompatible pointer type [enabled by default]
+	include/linux/spinlock_rt.h:22:56: note: expected ‘struct spinlock_t *’ but argument is of type ‘struct seqlock_t *’
+
+Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
+Forwarded: http://mid.gmane.org/1331482999-32252-1-git-send-email-u.kleine-koenig@pengutronix.de
+---
+
+ drivers/staging/pohmelfs/path_entry.c |    8 ++++----
+ 1 files changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/staging/pohmelfs/path_entry.c b/drivers/staging/pohmelfs/path_entry.c
+index 400a9fc..fc0c3fe 100644
+--- a/drivers/staging/pohmelfs/path_entry.c
++++ b/drivers/staging/pohmelfs/path_entry.c
+@@ -44,9 +44,9 @@ int pohmelfs_construct_path_string(struct pohmelfs_inode *pi, void *data, int le
+ 		return -ENOENT;
+ 	}
+ 
+-	spin_lock(&current->fs->lock);
++	seq_spin_lock(&current->fs->lock);
+ 	path.mnt = mntget(current->fs->root.mnt);
+-	spin_unlock(&current->fs->lock);
++	seq_spin_unlock(&current->fs->lock);
+ 
+ 	path.dentry = d;
+ 
+@@ -92,9 +92,9 @@ int pohmelfs_path_length(struct pohmelfs_inode *pi)
+ 		return -ENOENT;
+ 	}
+ 
+-	spin_lock(&current->fs->lock);
++	seq_spin_lock(&current->fs->lock);
+ 	root = dget(current->fs->root.dentry);
+-	spin_unlock(&current->fs->lock);
++	seq_spin_unlock(&current->fs->lock);
+ 
+ rename_retry:
+ 	len = 1; /* Root slash */

debian/patches/series/base-extra

@@ -268,3 +268,5 @@
 + features/all/rt/net-use-cpu-chill.patch featureset=rt
 + features/all/rt/kconfig-disable-a-few-options-rt.patch featureset=rt
 + features/all/rt/kconfig-preempt-rt-full.patch featureset=rt
++ features/all/rt/fix-rt+link-creation-restrictions featureset=rt
++ features/all/rt/staging-pohmelfs-convert-struct-fs-lock-usage-to-.patch featureset=rt