Chris Mason wrote:
> Excerpts from Li Zefan's message of 2011-06-12 21:52:32 -0400:
>> Josef Bacik wrote:
>>> We used to store the checksums of the space cache directly in the space
>>> cache,
>>> however that doesn't work out too well if we have more space than we can
>>> fit the
>>> checksums into the first page. So instead use the normal checksumming
>>> infrastructure. There were problems with doing this originally but those
>>> problems don't exist now so this works out fine. Thanks,
>>>
>>
>> This looks great, so I'll drop my patch that extends the original code to
>> allow more than 1 crc page.
>
> I do like them a lot, but what happens when a special case crc kernel
> mounts a free space cache created by this patch?
>
So we need a check, like the one in load_free_space_cache():
@@ -2650,6 +2650,11 @@ int load_free_ino_cache(struct btrfs_fs_info *fs_info, st
if (IS_ERR(inode))
goto out;
+ if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) {
+ printk(KERN_INFO "Old style space inode found, converting.\n");
+ BTRFS_I(inode)->flags &= ~BTRFS_INODE_NODATASUM;
+ }
+
if (root_gen != BTRFS_I(inode)->generation)
goto out_put;
then we'll not trying to load the cache from disk but reconstruct the
cache by searching the fs tree.
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