diff options
| author | Tejun Heo | 2015-05-28 14:50:49 -0400 |
|---|---|---|
| committer | Jens Axboe | 2015-06-02 08:39:08 -0600 |
| commit | 21c6321fbb3a3787af07f1bc031d713a707fb69c (patch) | |
| tree | de5489853b7f0d82adfd74da30d3945aba45e366 /mm | |
| parent | 97c9341f727105c29478da19f1687b0e0a917256 (diff) | |
writeback: relocate wb[_try]_get(), wb_put(), inode_{attach|detach}_wb()
Currently, majority of cgroup writeback support including all the
above functions are implemented in include/linux/backing-dev.h and
mm/backing-dev.c; however, the portion closely related to writeback
logic implemented in include/linux/writeback.h and mm/page-writeback.c
will expand to support foreign writeback detection and correction.
This patch moves wb[_try]_get() and wb_put() to
include/linux/backing-dev-defs.h so that they can be used from
writeback.h and inode_{attach|detach}_wb() to writeback.h and
page-writeback.c.
This is pure reorganization and doesn't introduce any functional
changes.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Greg Thelen <gthelen@google.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/backing-dev.c | 30 |
1 files changed, 0 insertions, 30 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 84ebf7c8d006..887d72a85b5e 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -660,36 +660,6 @@ struct bdi_writeback *wb_get_create(struct backing_dev_info *bdi, return wb; } -void __inode_attach_wb(struct inode *inode, struct page *page) -{ - struct backing_dev_info *bdi = inode_to_bdi(inode); - struct bdi_writeback *wb = NULL; - - if (inode_cgwb_enabled(inode)) { - struct cgroup_subsys_state *memcg_css; - - if (page) { - memcg_css = mem_cgroup_css_from_page(page); - wb = wb_get_create(bdi, memcg_css, GFP_ATOMIC); - } else { - /* must pin memcg_css, see wb_get_create() */ - memcg_css = task_get_css(current, memory_cgrp_id); - wb = wb_get_create(bdi, memcg_css, GFP_ATOMIC); - css_put(memcg_css); - } - } - - if (!wb) - wb = &bdi->wb; - - /* - * There may be multiple instances of this function racing to - * update the same inode. Use cmpxchg() to tell the winner. - */ - if (unlikely(cmpxchg(&inode->i_wb, NULL, wb))) - wb_put(wb); -} - static void cgwb_bdi_init(struct backing_dev_info *bdi) { bdi->wb.memcg_css = mem_cgroup_root_css; |