mm: do not ignore mapping_gfp_mask in page cache allocation paths

page_cache_read, do_generic_file_read, __generic_file_splice_read and
__ntfs_grab_cache_pages currently ignore mapping_gfp_mask when calling
add_to_page_cache_lru which might cause recursion into fs down in the
direct reclaim path if the mapping really relies on GFP_NOFS semantic.

This doesn't seem to be the case now because page_cache_read (page fault
path) doesn't seem to suffer from the reclaim recursion issues and
do_generic_file_read and __generic_file_splice_read also shouldn't be
called under fs locks which would deadlock in the reclaim path.  Anyway it
is better to obey mapping gfp mask and prevent from later breakage.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Anton Altaparmakov <anton@tuxera.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index 519af0045b1c..8d17ceea8dbe 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1664,8 +1664,8 @@ no_cached_page:
                         error = -ENOMEM;
                         goto out;
                 }
-                error = add_to_page_cache_lru(page, mapping,
-                                                index, GFP_KERNEL);
+                error = add_to_page_cache_lru(page, mapping, index,
+                                        GFP_KERNEL & mapping_gfp_mask(mapping));
                 if (error) {
                         page_cache_release(page);
                         if (error == -EEXIST) {
@@ -1766,7 +1766,8 @@ static int page_cache_read(struct file *file, pgoff_t offset)
                 if (!page)
                         return -ENOMEM;
 
-                ret = add_to_page_cache_lru(page, mapping, offset, GFP_KERNEL);
+                ret = add_to_page_cache_lru(page, mapping, offset,
+                                GFP_KERNEL & mapping_gfp_mask(mapping));
                 if (ret == 0)
                         ret = mapping->a_ops->readpage(file, page);
                 else if (ret == -EEXIST)