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Btrfs: extent_map and data=ordered fixes for space balancing

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* Add an EXTENT_BOUNDARY state bit to keep the writepage code
from merging data extents that are in the process of being
relocated.  This allows us to do accounting for them properly.

* The balancing code relocates data extents indepdent of the underlying
inode.  The extent_map code was modified to properly account for
things moving around (invalidating extent_map caches in the inode).

* Don't take the drop_mutex in the create_subvol ioctl.  It isn't
required.

* Fix walking of the ordered extent list to avoid races with sys_unlink

* Change the lock ordering rules.  Transaction start goes outside
the drop_mutex.  This allows btrfs_commit_transaction to directly
drop the relocation trees.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Zheng Yan
2008-09-26 10:05:38 -04:00
committed by Chris Mason
parent e465768938
commit 5b21f2ed3f
10 changed files with 108 additions and 49 deletions
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4
fs/btrfs/inode-map.c
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@@ -117,10 +117,14 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
*objectid = last_ino;
goto found;
}
} else if (key.objectid > search_start) {
*objectid = search_start;
goto found;
}
}
if (key.objectid >= BTRFS_LAST_FREE_OBJECTID)
break;
start_found = 1;
last_ino = key.objectid + 1;
path->slots[0]++;