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authorArtem Bityutskiy <Artem.Bityutskiy@linux.intel.com>2012-07-14 13:19:46 +0200
committerArtem Bityutskiy <artem.bityutskiy@linux.intel.com>2012-07-20 09:27:25 +0200
commit06bef9451a4c5ad882cd15fd7a0df9890c0249f3 (patch)
treeabd269a573e5ffce8b7e92c39cc3000ca1ecb944 /fs/ubifs/debug.h
parentUBIFS: fix compilation warning (diff)
downloadlinux-06bef9451a4c5ad882cd15fd7a0df9890c0249f3.tar.xz
linux-06bef9451a4c5ad882cd15fd7a0df9890c0249f3.zip
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>
Diffstat (limited to 'fs/ubifs/debug.h')
-rw-r--r--fs/ubifs/debug.h5
1 files changed, 5 insertions, 0 deletions
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;
};
/**