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Liu Bo authored
The btrfs snapshotting code requires that once a root has been snapshotted, we don't change it during a commit. But there are two cases to lead to tree corruptions: 1) multi-thread snapshots can commit serveral snapshots in a transaction, and this may change the src root when processing the following pending snapshots, which lead to the former snapshots corruptions; 2) the free inode cache was changing the roots when it root the cache, which lead to corruptions. This fixes things by making sure we force COW the block after we create a snapshot during commiting a transaction, then any changes to the roots will result in COW, and we get all the fs roots and snapshot roots to be consistent. Signed-off-by:
Liu Bo <liubo2009@cn.fujitsu.com> Signed-off-by:
Miao Xie <miaox@cn.fujitsu.com> Signed-off-by:
Chris Mason <chris.mason@oracle.com>
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