On Tue, Dec 14, 2021 at 04:49:45PM -0800, Darrick J. Wong wrote:

On Tue, Dec 14, 2021 at 05:50:58PM +0000, Luís Henriques wrote:

quoted

When migrating to extents, the temporary inode will have it's own checksum
seed.  This means that, when swapping the inodes data, the inode checksums
will be incorrect.

This can be fixed by recalculating the extents checksums again.  Or simply
by copying the seed into the temporary inode.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=213357
Reported-by: Jeroen van Wolffelaar <redacted>
Signed-off-by: Luís Henriques <redacted>
---
 fs/ext4/migrate.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

changes since v1:

* Dropped tmp_ei variable
* ->i_csum_seed is now initialised immediately after tmp_inode is created
* New comment about the seed initialization and stating that recovery
  needs to be fixed.

Cheers,
--
Luís

diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
index 7e0b4f81c6c0..36dfc88ce05b 100644
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c

@@ -459,6 +459,17 @@ int ext4_ext_migrate(struct inode *inode)
 		ext4_journal_stop(handle);
 		goto out_unlock;
 	}
+	/*
+	 * Use the correct seed for checksum (i.e. the seed from 'inode').  This
+	 * is so that the metadata blocks will have the correct checksum after
+	 * the migration.
+	 *
+	 * Note however that, if a crash occurs during the migration process,
+	 * the recovery process is broken because the tmp_inode checksums will
+	 * be wrong and the orphans cleanup will fail.

...and then what does the user do?

I can't really say I know what is the right thing for a user to do.  But
my understanding is that my patch doesn't change a lot: the recovery
process would still fail in a slightly different way, and will need to be
fixed at some point.

I believe the userspace tools already have support to handle orphan file,
but a quick look at the latest version of the patchset show that these
tools can't handle this either, and the recovery will also fail.  But I
may be wrong.

Cheers,
--
Luís

--D

quoted

+	 */
+	ei = EXT4_I(inode);
+	EXT4_I(tmp_inode)->i_csum_seed = ei->i_csum_seed;
 	i_size_write(tmp_inode, i_size_read(inode));
 	/*
 	 * Set the i_nlink to zero so it will be deleted later

@@ -502,7 +513,6 @@ int ext4_ext_migrate(struct inode *inode)
 		goto out_tmp_inode;
 	}
 
-	ei = EXT4_I(inode);
 	i_data = ei->i_data;
 	memset(&lb, 0, sizeof(lb));