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23 October 2021, 00:29:24 UTC
Revision 276e680d192a67d222fcea51af37b056feffb665 authored by Yan Zheng on 30 July 2009, 13:40:40 UTC, committed by Chris Mason on 30 July 2009, 13:40:40 UTC 
Btrfs: preserve commit_root for async caching
 
The async block group caching code uses the commit_root pointer
to get a stable version of the extent allocation tree for scanning.
This copy of the tree root isn't going to change and it significantly
reduces the complexity of the scanning code.

During a commit, we have a loop where we update the extent allocation
tree root.  We need to loop because updating the root pointer in
the tree of tree roots may allocate blocks which may change the
extent allocation tree.

Right now the commit_root pointer is changed inside this loop.  It
is more correct to change the commit_root pointer only after all the
looping is done.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
1 parent f25784b
History
Tip revision: 276e680d192a67d222fcea51af37b056feffb665 authored by Yan Zheng on 30 July 2009, 13:40:40 UTC
Btrfs: preserve commit_root for async caching
Tip revision: 276e680
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