dax: Fix sleep in atomic contex in grab_mapping_entry()

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Commit 642261ac99: "dax: add struct iomap based DAX PMD support" has
introduced unmapping of page tables if huge page needs to be split in
grab_mapping_entry(). However the unmapping happens after
radix_tree_preload() call which disables preemption and thus
unmap_mapping_range() tries to acquire i_mmap_lock in atomic context
which is a bug. Fix the problem by moving unmapping before
radix_tree_preload() call.

Fixes: 642261ac99
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

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Jan Kara 2016-12-12 21:34:12 -05:00 • committed by Theodore Ts'o

parent 73b92a2a5e

commit 0cb80b4847

1 changed files with 7 additions and 8 deletions

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fs/dax.c

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