| commit | 3ecb3ac7b950ff8f6c6a61e8b7b0d6e3546429a0 | [log] [tgz] |
|---|---|---|
| author | Darrick J. Wong <darrick.wong@oracle.com> | Mon May 15 19:16:15 2017 -0700 |
| committer | Darrick J. Wong <darrick.wong@oracle.com> | Fri May 19 08:12:49 2017 -0700 |
| tree | ae238320000d65e6bce1fd30cd8c0ae644be022b | |
| parent | ea9a46e1c49251331dbfda19ced7114337966178 [diff] |
xfs: avoid mount-time deadlock in CoW extent recovery If a malicious user corrupts the refcount btree to cause a cycle between different levels of the tree, the next mount attempt will deadlock in the CoW recovery routine while grabbing buffer locks. We can use the ability to re-grab a buffer that was previous locked to a transaction to avoid deadlocks, so do that here. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>