From 38c894b2c0d007a64f3b3815a076d7c69ef90017 Mon Sep 17 00:00:00 2001
From: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
Date: Sat, 14 Jul 2012 14:19:46 +0300
Subject: [PATCH] --- yaml --- r: 312992 b: refs/heads/master c:
 06bef9451a4c5ad882cd15fd7a0df9890c0249f3 h: refs/heads/master v: v3

---
 [refs]                 |  2 +-
 trunk/fs/ubifs/debug.c | 11 +++++++++++
 trunk/fs/ubifs/debug.h |  5 +++++
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index b6860c9e93af..14a2d3c9b782 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 782759b9f5f5223e0962af60c3457c912fab755f
+refs/heads/master: 06bef9451a4c5ad882cd15fd7a0df9890c0249f3
diff --git a/trunk/fs/ubifs/debug.c b/trunk/fs/ubifs/debug.c
index 92df3b081539..bb3167257aab 100644
--- a/trunk/fs/ubifs/debug.c
+++ b/trunk/fs/ubifs/debug.c
@@ -2802,6 +2802,8 @@ static ssize_t dfs_file_read(struct file *file, char __user *u, size_t count,
 		val = d->chk_fs;
 	else if (dent == d->dfs_tst_rcvry)
 		val = d->tst_rcvry;
+	else if (dent == d->dfs_ro_error)
+		val = c->ro_error;
 	else
 		return -EINVAL;
 
@@ -2885,6 +2887,8 @@ static ssize_t dfs_file_write(struct file *file, const char __user *u,
 		d->chk_fs = val;
 	else if (dent == d->dfs_tst_rcvry)
 		d->tst_rcvry = val;
+	else if (dent == d->dfs_ro_error)
+		c->ro_error = !!val;
 	else
 		return -EINVAL;
 
@@ -2996,6 +3000,13 @@ int dbg_debugfs_init_fs(struct ubifs_info *c)
 		goto out_remove;
 	d->dfs_tst_rcvry = dent;
 
+	fname = "ro_error";
+	dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c,
+				   &dfs_fops);
+	if (IS_ERR_OR_NULL(dent))
+		goto out_remove;
+	d->dfs_ro_error = dent;
+
 	return 0;
 
 out_remove:
diff --git a/trunk/fs/ubifs/debug.h b/trunk/fs/ubifs/debug.h
index 486a8e024fb6..8b8cc4e945f4 100644
--- a/trunk/fs/ubifs/debug.h
+++ b/trunk/fs/ubifs/debug.h
@@ -79,6 +79,10 @@ typedef int (*dbg_znode_callback)(struct ubifs_info *c,
  * @dfs_chk_lprops: debugfs knob to enable UBIFS LEP properties extra checks
  * @dfs_chk_fs: debugfs knob to enable UBIFS contents extra checks
  * @dfs_tst_rcvry: debugfs knob to enable UBIFS recovery testing
+ * @dfs_ro_error: debugfs knob to switch UBIFS to R/O mode (different to
+ *                re-mounting to R/O mode because it does not flush any buffers
+ *                and UBIFS just starts returning -EROFS on all write
+ *               operations)
  */
 struct ubifs_debug_info {
 	struct ubifs_zbranch old_zroot;
@@ -122,6 +126,7 @@ struct ubifs_debug_info {
 	struct dentry *dfs_chk_lprops;
 	struct dentry *dfs_chk_fs;
 	struct dentry *dfs_tst_rcvry;
+	struct dentry *dfs_ro_error;
 };
 
 /**