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Gioh Kim a68299adc7 fs/buffer.c: support buffer cache allocations with gfp modifiers ...

commit 3b5e6454aa upstream.

A buffer cache is allocated from movable area because it is referred
for a while and released soon.  But some filesystems are taking buffer
cache for a long time and it can disturb page migration.

New APIs are introduced to allocate buffer cache with user specific
flag.  *_gfp APIs are for user want to set page allocation flag for
page cache allocation.  And *_unmovable APIs are for the user wants to
allocate page cache from non-movable area.

Signed-off-by: Gioh Kim <gioh.kim@lge.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
[ luis: 3.16 prereq for:
  bd7ade3cd9 "bufferhead: Add _gfp version for sb_getblk()" ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

2015-08-27 14:53:36 +01:00

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