path: root/mm/memcontrol.c
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authorRoss Zwisler <ross.zwisler@linux.intel.com>2016-08-25 15:17:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-26 17:39:35 -0700
commit11bd969fdefea3ac0cb9791224f1e09784e21e58 (patch)
tree0acb5b64edc970860174c068698448b94f3122c8 /mm/memcontrol.c
parentd0e5845561c238619de9f5b77e0d763f4c331ca5 (diff)
mm: silently skip readahead for DAX inodes
For DAX inodes we need to be careful to never have page cache pages in the mapping->page_tree. This radix tree should be composed only of DAX exceptional entries and zero pages. ltp's readahead02 test was triggering a warning because we were trying to insert a DAX exceptional entry but found that a page cache page had already been inserted into the tree. This page was being inserted into the radix tree in response to a readahead(2) call. Readahead doesn't make sense for DAX inodes, but we don't want it to report a failure either. Instead, we just return success and don't do any work. Link: http://lkml.kernel.org/r/20160824221429.21158-1-ross.zwisler@linux.intel.com Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Reported-by: Jeff Moyer <jmoyer@redhat.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: <stable@vger.kernel.org> [4.5+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
0 files changed, 0 insertions, 0 deletions