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author | Ross Zwisler <ross.zwisler@linux.intel.com> | 2016-08-26 01:17:17 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-08-27 03:39:35 +0300 |
commit | 11bd969fdefea3ac0cb9791224f1e09784e21e58 (patch) | |
tree | 0acb5b64edc970860174c068698448b94f3122c8 /mm/swap_cgroup.c | |
parent | d0e5845561c238619de9f5b77e0d763f4c331ca5 (diff) | |
download | linux-11bd969fdefea3ac0cb9791224f1e09784e21e58.tar.xz |
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/swap_cgroup.c')
0 files changed, 0 insertions, 0 deletions