Messages in this thread | ![/](/images/icornerl.gif) | | From | Christoph Hellwig <> | Subject | fix block device size update serialization | Date | Fri, 21 Aug 2020 10:55:58 +0200 |
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Hi Jens,
this series fixes how we update i_size for the block device inodes (and thus the block device). Different helpers use two different locks (bd_mutex and i_rwsem) to protect the update, and it appears device mapper uses yet another internal lock. A lot of the drivers do the update handcrafted in often crufty ways. And in addition to that mess it turns out that the "main" lock, bd_mutex is pretty dead lock prone vs other spots in the block layer that acquire it during revalidation operations, as reported by Xianting.
Fix all that by adding a dedicated spinlock just for the size updates.
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