linux-ext4 - Re: [Take 2]e2fsprogs: Undo I/O manager

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Message-ID: <46A02665.9090200@linux.vnet.ibm.com>
Date:	Fri, 20 Jul 2007 08:35:09 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Theodore Tso <tytso@....edu>
CC:	linux-ext4@...r.kernel.org
Subject: Re: [Take 2]e2fsprogs: Undo I/O manager



Theodore Tso wrote:
> On Thu, Jul 19, 2007 at 11:28:06PM +0530, Aneesh Kumar K.V wrote:
>> This patch fixes some bugs found during testing of the large
>> inode migration patches.
> 
> How are you testing it?  I notice you haven't wired these into any of
> the existing e2fsprogs programs.
> 
> Regards,
> 


Attaching below is a simple test program i used to verify this. I also used
this along with the ext3 ext4 migration tool.

-aneesh


diff --git a/test.aneesh/test.c b/test.aneesh/test.c
new file mode 100644
index 0000000..7d0a3e3
--- /dev/null
+++ b/test.aneesh/test.c
@@ -0,0 +1,25 @@
+
+#include "ext2fs/ext2_fs.h"
+#include "ext2fs/ext2fs.h"
+
+main(int argc, char *argv[])
+{
+	char *dev_name, *file_name;
+	int flags, superblock = 0;
+	unsigned int block_size = 0;
+	ext2_filsys current_fs = NULL;
+
+	dev_name = argv[1];
+	file_name = argv[2];
+	flags = EXT2_FLAG_SOFTSUPP_FEATURES | EXT2_FLAG_RW;
+	set_undo_io_backing_manager(unix_io_manager);
+	set_undo_io_backup_file(file_name);
+	ext2fs_open2(dev_name, 0,
+			flags, superblock, block_size,
+			undo_io_manager, &current_fs);
+
+	/* Now write super block with junk */
+	memcpy(current_fs->super, "crash me", 8);
+	ext2fs_mark_super_dirty(current_fs);
+	ext2fs_close(current_fs);
+}
-
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