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    Subject[PATCH 5.10 477/563] ext4: set csum seed in tmp inode while migrating to extents
    Date
    From: Luís Henriques <lhenriques@suse.de>

    commit e81c9302a6c3c008f5c30beb73b38adb0170ff2d upstream.

    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 <jeroen@wolffelaar.nl>
    Signed-off-by: Luís Henriques <lhenriques@suse.de>
    Link: https://lore.kernel.org/r/20211214175058.19511-1-lhenriques@suse.de
    Signed-off-by: Theodore Ts'o <tytso@mit.edu>
    Cc: stable@kernel.org
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    fs/ext4/migrate.c | 12 +++++++++++-
    1 file changed, 11 insertions(+), 1 deletion(-)

    --- 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.
    + */
    + 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));


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