UBIFS: add debugfs knob to switch to R/O mode

This patch adds another debugfs knob which switches UBIFS to R/O mode.
I needed it while trying to reproduce the 'first log node is not CS node'
bug. Without this debugfs knob you have to perform a power cut to repruduce
the bug. The knob is named 'ro_error' and all it does is it sets the
'ro_error' UBIFS flag which makes UBIFS disallow any further writes - even
write-back will fail with -EROFS. Useful for debugging.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>

2 files changed, 16 insertions, 0 deletions

diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index 92df3b081539..bb3167257aab 100644
--- a/fs/ubifs/debug.c
+++ b/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/fs/ubifs/debug.h b/fs/ubifs/debug.h
index 486a8e024fb6..8b8cc4e945f4 100644
--- a/fs/ubifs/debug.h
+++ b/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;
 };
 
 /**