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| author | Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com> | 2012-07-14 14:19:46 +0300 |
|---|---|---|
| committer | Artem Bityutskiy <artem.bityutskiy@linux.intel.com> | 2012-07-20 10:27:25 +0300 |
| commit | 06bef9451a4c5ad882cd15fd7a0df9890c0249f3 (patch) | |
| tree | abd269a573e5ffce8b7e92c39cc3000ca1ecb944 /fs/ubifs/debug.h | |
| parent | 782759b9f5f5223e0962af60c3457c912fab755f (diff) | |
| download | lwn-06bef9451a4c5ad882cd15fd7a0df9890c0249f3.tar.gz lwn-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.h | 5 |
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; }; /** |