btrfs: scrub: add memalloc_nofs protection around init_ipath

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init_ipath is called from a safe ioctl context and from scrub when
printing an error.  The protection is added for three reasons:

* init_data_container calls vmalloc and this does not work as expected
  in the GFP_NOFS context, so this silently does GFP_KERNEL and might
  deadlock in some cases
* keep the context constraint of GFP_NOFS, used by scrub
* we want to use GFP_KERNEL unconditionally inside init_ipath or its
  callees

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

David Sterba 2017-05-31 19:21:38 +02:00

parent f11f74416a

commit de2491fdef

1 changed files with 9 additions and 0 deletions

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fs/btrfs/scrub.c

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