dax: Reinstate RCU protection of inode

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For the device-dax case, it is possible that the inode can go away
underneath us.  The rcu_read_lock() was there to prevent it from
being freed, and not (as I thought) to protect the tree.  Bring back
the rcu_read_lock() protection.  Also add a little kernel-doc; while
this function is not exported to modules, it is used from outside dax.c

Reported-by: Dan Williams <dan.j.williams@intel.com>
Fixes: 9f32d22130 ("dax: Convert dax_lock_mapping_entry to XArray")
Signed-off-by: Matthew Wilcox <willy@infradead.org>

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Matthew Wilcox 2018-11-16 14:37:06 -05:00

parent 7ae2ea7dc4

commit c5bbd4515a

1 changed files with 19 additions and 3 deletions

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fs/dax.c

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