diff options
author | Tejun Heo <tj@kernel.org> | 2015-05-28 14:50:49 -0400 |
---|---|---|
committer | Jens Axboe <axboe@fb.com> | 2015-06-02 08:39:08 -0600 |
commit | 21c6321fbb3a3787af07f1bc031d713a707fb69c (patch) | |
tree | de5489853b7f0d82adfd74da30d3945aba45e366 | |
parent | 97c9341f727105c29478da19f1687b0e0a917256 (diff) | |
download | linux-stable-21c6321fbb3a3787af07f1bc031d713a707fb69c.tar.gz linux-stable-21c6321fbb3a3787af07f1bc031d713a707fb69c.tar.bz2 linux-stable-21c6321fbb3a3787af07f1bc031d713a707fb69c.zip |
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>
-rw-r--r-- | fs/fs-writeback.c | 31 | ||||
-rw-r--r-- | include/linux/backing-dev-defs.h | 50 | ||||
-rw-r--r-- | include/linux/backing-dev.h | 82 | ||||
-rw-r--r-- | include/linux/writeback.h | 46 | ||||
-rw-r--r-- | mm/backing-dev.c | 30 |
5 files changed, 127 insertions, 112 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index da355879ba7c..cf6ccfb01e03 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -27,6 +27,7 @@ #include <linux/backing-dev.h> #include <linux/tracepoint.h> #include <linux/device.h> +#include <linux/memcontrol.h> #include "internal.h" /* @@ -213,6 +214,36 @@ static void wb_wait_for_completion(struct backing_dev_info *bdi, #ifdef CONFIG_CGROUP_WRITEBACK +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); +} + /** * inode_congested - test whether an inode is congested * @inode: inode to test for congestion diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h index 8d470b73824f..e047b496a0b9 100644 --- a/include/linux/backing-dev-defs.h +++ b/include/linux/backing-dev-defs.h @@ -186,4 +186,54 @@ static inline void set_bdi_congested(struct backing_dev_info *bdi, int sync) set_wb_congested(bdi->wb.congested, sync); } +#ifdef CONFIG_CGROUP_WRITEBACK + +/** + * wb_tryget - try to increment a wb's refcount + * @wb: bdi_writeback to get + */ +static inline bool wb_tryget(struct bdi_writeback *wb) +{ + if (wb != &wb->bdi->wb) + return percpu_ref_tryget(&wb->refcnt); + return true; +} + +/** + * wb_get - increment a wb's refcount + * @wb: bdi_writeback to get + */ +static inline void wb_get(struct bdi_writeback *wb) +{ + if (wb != &wb->bdi->wb) + percpu_ref_get(&wb->refcnt); +} + +/** + * wb_put - decrement a wb's refcount + * @wb: bdi_writeback to put + */ +static inline void wb_put(struct bdi_writeback *wb) +{ + if (wb != &wb->bdi->wb) + percpu_ref_put(&wb->refcnt); +} + +#else /* CONFIG_CGROUP_WRITEBACK */ + +static inline bool wb_tryget(struct bdi_writeback *wb) +{ + return true; +} + +static inline void wb_get(struct bdi_writeback *wb) +{ +} + +static inline void wb_put(struct bdi_writeback *wb) +{ +} + +#endif /* CONFIG_CGROUP_WRITEBACK */ + #endif /* __LINUX_BACKING_DEV_DEFS_H */ diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index e9d7373f5f93..5c978a924157 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -243,7 +243,6 @@ void wb_congested_put(struct bdi_writeback_congested *congested); struct bdi_writeback *wb_get_create(struct backing_dev_info *bdi, struct cgroup_subsys_state *memcg_css, gfp_t gfp); -void __inode_attach_wb(struct inode *inode, struct page *page); void wb_memcg_offline(struct mem_cgroup *memcg); void wb_blkcg_offline(struct blkcg *blkcg); int inode_congested(struct inode *inode, int cong_bits); @@ -265,37 +264,6 @@ static inline bool inode_cgwb_enabled(struct inode *inode) } /** - * wb_tryget - try to increment a wb's refcount - * @wb: bdi_writeback to get - */ -static inline bool wb_tryget(struct bdi_writeback *wb) -{ - if (wb != &wb->bdi->wb) - return percpu_ref_tryget(&wb->refcnt); - return true; -} - -/** - * wb_get - increment a wb's refcount - * @wb: bdi_writeback to get - */ -static inline void wb_get(struct bdi_writeback *wb) -{ - if (wb != &wb->bdi->wb) - percpu_ref_get(&wb->refcnt); -} - -/** - * wb_put - decrement a wb's refcount - * @wb: bdi_writeback to put - */ -static inline void wb_put(struct bdi_writeback *wb) -{ - if (wb != &wb->bdi->wb) - percpu_ref_put(&wb->refcnt); -} - -/** * wb_find_current - find wb for %current on a bdi * @bdi: bdi of interest * @@ -354,35 +322,6 @@ wb_get_create_current(struct backing_dev_info *bdi, gfp_t gfp) } /** - * inode_attach_wb - associate an inode with its wb - * @inode: inode of interest - * @page: page being dirtied (may be NULL) - * - * If @inode doesn't have its wb, associate it with the wb matching the - * memcg of @page or, if @page is NULL, %current. May be called w/ or w/o - * @inode->i_lock. - */ -static inline void inode_attach_wb(struct inode *inode, struct page *page) -{ - if (!inode->i_wb) - __inode_attach_wb(inode, page); -} - -/** - * inode_detach_wb - disassociate an inode from its wb - * @inode: inode of interest - * - * @inode is being freed. Detach from its wb. - */ -static inline void inode_detach_wb(struct inode *inode) -{ - if (inode->i_wb) { - wb_put(inode->i_wb); - inode->i_wb = NULL; - } -} - -/** * inode_to_wb - determine the wb of an inode * @inode: inode of interest * @@ -471,19 +410,6 @@ static inline void wb_congested_put(struct bdi_writeback_congested *congested) { } -static inline bool wb_tryget(struct bdi_writeback *wb) -{ - return true; -} - -static inline void wb_get(struct bdi_writeback *wb) -{ -} - -static inline void wb_put(struct bdi_writeback *wb) -{ -} - static inline struct bdi_writeback *wb_find_current(struct backing_dev_info *bdi) { return &bdi->wb; @@ -495,14 +421,6 @@ wb_get_create_current(struct backing_dev_info *bdi, gfp_t gfp) return &bdi->wb; } -static inline void inode_attach_wb(struct inode *inode, struct page *page) -{ -} - -static inline void inode_detach_wb(struct inode *inode) -{ -} - static inline struct bdi_writeback *inode_to_wb(struct inode *inode) { return &inode_to_bdi(inode)->wb; diff --git a/include/linux/writeback.h b/include/linux/writeback.h index 3b73e97ecfc7..6726b7e56beb 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -8,6 +8,7 @@ #include <linux/workqueue.h> #include <linux/fs.h> #include <linux/flex_proportions.h> +#include <linux/backing-dev-defs.h> DECLARE_PER_CPU(int, dirty_throttle_leaks); @@ -173,6 +174,51 @@ static inline void wait_on_inode(struct inode *inode) wait_on_bit(&inode->i_state, __I_NEW, TASK_UNINTERRUPTIBLE); } +#ifdef CONFIG_CGROUP_WRITEBACK + +void __inode_attach_wb(struct inode *inode, struct page *page); + +/** + * inode_attach_wb - associate an inode with its wb + * @inode: inode of interest + * @page: page being dirtied (may be NULL) + * + * If @inode doesn't have its wb, associate it with the wb matching the + * memcg of @page or, if @page is NULL, %current. May be called w/ or w/o + * @inode->i_lock. + */ +static inline void inode_attach_wb(struct inode *inode, struct page *page) +{ + if (!inode->i_wb) + __inode_attach_wb(inode, page); +} + +/** + * inode_detach_wb - disassociate an inode from its wb + * @inode: inode of interest + * + * @inode is being freed. Detach from its wb. + */ +static inline void inode_detach_wb(struct inode *inode) +{ + if (inode->i_wb) { + wb_put(inode->i_wb); + inode->i_wb = NULL; + } +} + +#else /* CONFIG_CGROUP_WRITEBACK */ + +static inline void inode_attach_wb(struct inode *inode, struct page *page) +{ +} + +static inline void inode_detach_wb(struct inode *inode) +{ +} + +#endif /* CONFIG_CGROUP_WRITEBACK */ + /* * mm/page-writeback.c */ 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; |