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Btrfs: Fix super block updates during transaction commit

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The super block written during commit was not consistent with the state of
the trees.  This change adds an in-memory copy of the super so that we can
make sure to write out consistent data during a commit.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-06-26 10:06:50 -04:00
committed by David Woodhouse
parent 79c44584ea
commit 4b52dff6d3
5 changed files with 18 additions and 14 deletions
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8
fs/btrfs/transaction.c
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@@ -380,6 +380,12 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
else
prev_trans->use_count++;
}
btrfs_set_super_generation(&root->fs_info->super_copy,
cur_trans->transid);
btrfs_set_super_root(&root->fs_info->super_copy,
bh_blocknr(root->fs_info->tree_root->node));
memcpy(root->fs_info->disk_super, &root->fs_info->super_copy,
sizeof(root->fs_info->super_copy));
mutex_unlock(&root->fs_info->trans_mutex);
mutex_unlock(&root->fs_info->fs_mutex);
ret = btrfs_write_and_wait_transaction(trans, root);
@@ -389,8 +395,6 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
put_transaction(prev_trans);
mutex_unlock(&root->fs_info->trans_mutex);
}
btrfs_set_super_generation(root->fs_info->disk_super,
cur_trans->transid);
BUG_ON(ret);
write_ctree_super(trans, root);