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Btrfs: kill BTRFS_I(inode)->block_group

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Originally this was going to be used as a way to give hints to the allocator,
but frankly we can get much better hints elsewhere and it's not even used at all
for anything usefull.  In addition to be completely useless, when we initialize
an inode we try and find a freeish block group to set as the inodes block group,
and with a completely full 40gb fs this takes _forever_, so I imagine with say
1tb fs this is just unbearable.  So just axe the thing altoghether, we don't
need it and it saves us 8 bytes in the inode and saves us 500 microseconds per
inode lookup in my testcase.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik
2011-05-11 15:26:06 -04:00
parent 7e2355ba1a
commit d82a6f1d7e
8 changed files with 13 additions and 110 deletions
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2
fs/btrfs/xattr.c
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@ -158,8 +158,6 @@ int __btrfs_setxattr(struct btrfs_trans_handle *trans,
if (IS_ERR(trans))
return PTR_ERR(trans);
btrfs_set_trans_block_group(trans, inode);
ret = do_setxattr(trans, inode, name, value, size, flags);
if (ret)
goto out;