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SubjectRe: [PATCH 12/49] writeback: move backing_dev_info->bdi_stat[] into bdi_writeback
On Mon 06-04-15 15:58:01, Tejun Heo wrote:
> Currently, a bdi (backing_dev_info) embeds single wb (bdi_writeback)
> and the role of the separation is unclear. For cgroup support for
> writeback IOs, a bdi will be updated to host multiple wb's where each
> wb serves writeback IOs of a different cgroup on the bdi. To achieve
> that, a wb should carry all states necessary for servicing writeback
> IOs for a cgroup independently.
>
> This patch moves bdi->bdi_stat[] into wb.
>
> * enum bdi_stat_item is renamed to wb_stat_item and the prefix of all
> enums is changed from BDI_ to WB_.
>
> * BDI_STAT_BATCH() -> WB_STAT_BATCH()
>
> * [__]{add|inc|dec|sum}_wb_stat(bdi, ...) -> [__]{add|inc}_wb_stat(wb, ...)
>
> * bdi_stat[_error]() -> wb_stat[_error]()
>
> * bdi_writeout_inc() -> wb_writeout_inc()
>
> * stat init is moved to bdi_wb_init() and bdi_wb_exit() is added and
> frees stat.
Maybe bdi_wb_destroy() would be somewhat more descriptive than
bdi_wb_exit()? Otherwise the patch looks good to me. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>

Honza

>
> * As there's still only one bdi_writeback per backing_dev_info, all
> uses of bdi->stat[] are mechanically replaced with bdi->wb.stat[]
> introducing no behavior 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: Miklos Szeredi <miklos@szeredi.hu>
> Cc: Trond Myklebust <trond.myklebust@primarydata.com>
> ---
> fs/fs-writeback.c | 2 +-
> fs/fuse/file.c | 12 ++++----
> fs/nfs/internal.h | 2 +-
> fs/nfs/write.c | 3 +-
> include/linux/backing-dev.h | 68 +++++++++++++++++++++------------------------
> mm/backing-dev.c | 60 ++++++++++++++++++++++++---------------
> mm/filemap.c | 2 +-
> mm/page-writeback.c | 53 +++++++++++++++++------------------
> mm/truncate.c | 4 +--
> 9 files changed, 108 insertions(+), 98 deletions(-)
>
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index fea13fe..992a065 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -822,7 +822,7 @@ static bool over_bground_thresh(struct backing_dev_info *bdi)
> global_page_state(NR_UNSTABLE_NFS) > background_thresh)
> return true;
>
> - if (bdi_stat(bdi, BDI_RECLAIMABLE) >
> + if (wb_stat(&bdi->wb, WB_RECLAIMABLE) >
> bdi_dirty_limit(bdi, background_thresh))
> return true;
>
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index c01ec3b..997c88a 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -1469,9 +1469,9 @@ static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req)
>
> list_del(&req->writepages_entry);
> for (i = 0; i < req->num_pages; i++) {
> - dec_bdi_stat(bdi, BDI_WRITEBACK);
> + dec_wb_stat(&bdi->wb, WB_WRITEBACK);
> dec_zone_page_state(req->pages[i], NR_WRITEBACK_TEMP);
> - bdi_writeout_inc(bdi);
> + wb_writeout_inc(&bdi->wb);
> }
> wake_up(&fi->page_waitq);
> }
> @@ -1658,7 +1658,7 @@ static int fuse_writepage_locked(struct page *page)
> req->end = fuse_writepage_end;
> req->inode = inode;
>
> - inc_bdi_stat(inode_to_bdi(inode), BDI_WRITEBACK);
> + inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
> inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
>
> spin_lock(&fc->lock);
> @@ -1773,9 +1773,9 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
> copy_highpage(old_req->pages[0], page);
> spin_unlock(&fc->lock);
>
> - dec_bdi_stat(bdi, BDI_WRITEBACK);
> + dec_wb_stat(&bdi->wb, WB_WRITEBACK);
> dec_zone_page_state(page, NR_WRITEBACK_TEMP);
> - bdi_writeout_inc(bdi);
> + wb_writeout_inc(&bdi->wb);
> fuse_writepage_free(fc, new_req);
> fuse_request_free(new_req);
> goto out;
> @@ -1872,7 +1872,7 @@ static int fuse_writepages_fill(struct page *page,
> req->page_descs[req->num_pages].offset = 0;
> req->page_descs[req->num_pages].length = PAGE_SIZE;
>
> - inc_bdi_stat(inode_to_bdi(inode), BDI_WRITEBACK);
> + inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
> inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
>
> err = 0;
> diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
> index 9e6475b..7e3c460 100644
> --- a/fs/nfs/internal.h
> +++ b/fs/nfs/internal.h
> @@ -607,7 +607,7 @@ void nfs_mark_page_unstable(struct page *page)
> struct inode *inode = page_file_mapping(page)->host;
>
> inc_zone_page_state(page, NR_UNSTABLE_NFS);
> - inc_bdi_stat(inode_to_bdi(inode), BDI_RECLAIMABLE);
> + inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
> __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
> }
>
> diff --git a/fs/nfs/write.c b/fs/nfs/write.c
> index 849ed78..8bbeafe 100644
> --- a/fs/nfs/write.c
> +++ b/fs/nfs/write.c
> @@ -853,7 +853,8 @@ static void
> nfs_clear_page_commit(struct page *page)
> {
> dec_zone_page_state(page, NR_UNSTABLE_NFS);
> - dec_bdi_stat(inode_to_bdi(page_file_mapping(page)->host), BDI_RECLAIMABLE);
> + dec_wb_stat(&inode_to_bdi(page_file_mapping(page)->host)->wb,
> + WB_RECLAIMABLE);
> }
>
> /* Called holding inode (/cinfo) lock */
> diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
> index eb14f98..fe7a907 100644
> --- a/include/linux/backing-dev.h
> +++ b/include/linux/backing-dev.h
> @@ -36,15 +36,15 @@ enum wb_state {
>
> typedef int (congested_fn)(void *, int);
>
> -enum bdi_stat_item {
> - BDI_RECLAIMABLE,
> - BDI_WRITEBACK,
> - BDI_DIRTIED,
> - BDI_WRITTEN,
> - NR_BDI_STAT_ITEMS
> +enum wb_stat_item {
> + WB_RECLAIMABLE,
> + WB_WRITEBACK,
> + WB_DIRTIED,
> + WB_WRITTEN,
> + NR_WB_STAT_ITEMS
> };
>
> -#define BDI_STAT_BATCH (8*(1+ilog2(nr_cpu_ids)))
> +#define WB_STAT_BATCH (8*(1+ilog2(nr_cpu_ids)))
>
> struct bdi_writeback {
> struct backing_dev_info *bdi; /* our parent bdi */
> @@ -58,6 +58,8 @@ struct bdi_writeback {
> struct list_head b_more_io; /* parked for more writeback */
> struct list_head b_dirty_time; /* time stamps are dirty */
> spinlock_t list_lock; /* protects the b_* lists */
> +
> + struct percpu_counter stat[NR_WB_STAT_ITEMS];
> };
>
> struct backing_dev_info {
> @@ -69,8 +71,6 @@ struct backing_dev_info {
>
> char *name;
>
> - struct percpu_counter bdi_stat[NR_BDI_STAT_ITEMS];
> -
> unsigned long bw_time_stamp; /* last time write bw is updated */
> unsigned long dirtied_stamp;
> unsigned long written_stamp; /* pages written at bw_time_stamp */
> @@ -137,78 +137,74 @@ static inline int wb_has_dirty_io(struct bdi_writeback *wb)
> !list_empty(&wb->b_more_io);
> }
>
> -static inline void __add_bdi_stat(struct backing_dev_info *bdi,
> - enum bdi_stat_item item, s64 amount)
> +static inline void __add_wb_stat(struct bdi_writeback *wb,
> + enum wb_stat_item item, s64 amount)
> {
> - __percpu_counter_add(&bdi->bdi_stat[item], amount, BDI_STAT_BATCH);
> + __percpu_counter_add(&wb->stat[item], amount, WB_STAT_BATCH);
> }
>
> -static inline void __inc_bdi_stat(struct backing_dev_info *bdi,
> - enum bdi_stat_item item)
> +static inline void __inc_wb_stat(struct bdi_writeback *wb,
> + enum wb_stat_item item)
> {
> - __add_bdi_stat(bdi, item, 1);
> + __add_wb_stat(wb, item, 1);
> }
>
> -static inline void inc_bdi_stat(struct backing_dev_info *bdi,
> - enum bdi_stat_item item)
> +static inline void inc_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)
> {
> unsigned long flags;
>
> local_irq_save(flags);
> - __inc_bdi_stat(bdi, item);
> + __inc_wb_stat(wb, item);
> local_irq_restore(flags);
> }
>
> -static inline void __dec_bdi_stat(struct backing_dev_info *bdi,
> - enum bdi_stat_item item)
> +static inline void __dec_wb_stat(struct bdi_writeback *wb,
> + enum wb_stat_item item)
> {
> - __add_bdi_stat(bdi, item, -1);
> + __add_wb_stat(wb, item, -1);
> }
>
> -static inline void dec_bdi_stat(struct backing_dev_info *bdi,
> - enum bdi_stat_item item)
> +static inline void dec_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)
> {
> unsigned long flags;
>
> local_irq_save(flags);
> - __dec_bdi_stat(bdi, item);
> + __dec_wb_stat(wb, item);
> local_irq_restore(flags);
> }
>
> -static inline s64 bdi_stat(struct backing_dev_info *bdi,
> - enum bdi_stat_item item)
> +static inline s64 wb_stat(struct bdi_writeback *wb, enum wb_stat_item item)
> {
> - return percpu_counter_read_positive(&bdi->bdi_stat[item]);
> + return percpu_counter_read_positive(&wb->stat[item]);
> }
>
> -static inline s64 __bdi_stat_sum(struct backing_dev_info *bdi,
> - enum bdi_stat_item item)
> +static inline s64 __wb_stat_sum(struct bdi_writeback *wb,
> + enum wb_stat_item item)
> {
> - return percpu_counter_sum_positive(&bdi->bdi_stat[item]);
> + return percpu_counter_sum_positive(&wb->stat[item]);
> }
>
> -static inline s64 bdi_stat_sum(struct backing_dev_info *bdi,
> - enum bdi_stat_item item)
> +static inline s64 wb_stat_sum(struct bdi_writeback *wb, enum wb_stat_item item)
> {
> s64 sum;
> unsigned long flags;
>
> local_irq_save(flags);
> - sum = __bdi_stat_sum(bdi, item);
> + sum = __wb_stat_sum(wb, item);
> local_irq_restore(flags);
>
> return sum;
> }
>
> -extern void bdi_writeout_inc(struct backing_dev_info *bdi);
> +extern void wb_writeout_inc(struct bdi_writeback *wb);
>
> /*
> * maximal error of a stat counter.
> */
> -static inline unsigned long bdi_stat_error(struct backing_dev_info *bdi)
> +static inline unsigned long wb_stat_error(struct bdi_writeback *wb)
> {
> #ifdef CONFIG_SMP
> - return nr_cpu_ids * BDI_STAT_BATCH;
> + return nr_cpu_ids * WB_STAT_BATCH;
> #else
> return 1;
> #endif
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index b23cf0e..7b1d191 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -84,13 +84,13 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
> "b_dirty_time: %10lu\n"
> "bdi_list: %10u\n"
> "state: %10lx\n",
> - (unsigned long) K(bdi_stat(bdi, BDI_WRITEBACK)),
> - (unsigned long) K(bdi_stat(bdi, BDI_RECLAIMABLE)),
> + (unsigned long) K(wb_stat(wb, WB_WRITEBACK)),
> + (unsigned long) K(wb_stat(wb, WB_RECLAIMABLE)),
> K(bdi_thresh),
> K(dirty_thresh),
> K(background_thresh),
> - (unsigned long) K(bdi_stat(bdi, BDI_DIRTIED)),
> - (unsigned long) K(bdi_stat(bdi, BDI_WRITTEN)),
> + (unsigned long) K(wb_stat(wb, WB_DIRTIED)),
> + (unsigned long) K(wb_stat(wb, WB_WRITTEN)),
> (unsigned long) K(bdi->write_bandwidth),
> nr_dirty,
> nr_io,
> @@ -376,8 +376,10 @@ void bdi_unregister(struct backing_dev_info *bdi)
> }
> EXPORT_SYMBOL(bdi_unregister);
>
> -static void bdi_wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi)
> +static int bdi_wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi)
> {
> + int i, err;
> +
> memset(wb, 0, sizeof(*wb));
>
> wb->bdi = bdi;
> @@ -388,6 +390,27 @@ static void bdi_wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi)
> INIT_LIST_HEAD(&wb->b_dirty_time);
> spin_lock_init(&wb->list_lock);
> INIT_DELAYED_WORK(&wb->dwork, bdi_writeback_workfn);
> +
> + for (i = 0; i < NR_WB_STAT_ITEMS; i++) {
> + err = percpu_counter_init(&wb->stat[i], 0, GFP_KERNEL);
> + if (err) {
> + while (--i)
> + percpu_counter_destroy(&wb->stat[i]);
> + return err;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static void bdi_wb_exit(struct bdi_writeback *wb)
> +{
> + int i;
> +
> + WARN_ON(delayed_work_pending(&wb->dwork));
> +
> + for (i = 0; i < NR_WB_STAT_ITEMS; i++)
> + percpu_counter_destroy(&wb->stat[i]);
> }
>
> /*
> @@ -397,7 +420,7 @@ static void bdi_wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi)
>
> int bdi_init(struct backing_dev_info *bdi)
> {
> - int i, err;
> + int err;
>
> bdi->dev = NULL;
>
> @@ -408,13 +431,9 @@ int bdi_init(struct backing_dev_info *bdi)
> INIT_LIST_HEAD(&bdi->bdi_list);
> INIT_LIST_HEAD(&bdi->work_list);
>
> - bdi_wb_init(&bdi->wb, bdi);
> -
> - for (i = 0; i < NR_BDI_STAT_ITEMS; i++) {
> - err = percpu_counter_init(&bdi->bdi_stat[i], 0, GFP_KERNEL);
> - if (err)
> - goto err;
> - }
> + err = bdi_wb_init(&bdi->wb, bdi);
> + if (err)
> + return err;
>
> bdi->dirty_exceeded = 0;
>
> @@ -427,25 +446,20 @@ int bdi_init(struct backing_dev_info *bdi)
> bdi->avg_write_bandwidth = INIT_BW;
>
> err = fprop_local_init_percpu(&bdi->completions, GFP_KERNEL);
> -
> if (err) {
> -err:
> - while (i--)
> - percpu_counter_destroy(&bdi->bdi_stat[i]);
> + bdi_wb_exit(&bdi->wb);
> + return err;
> }
>
> - return err;
> + return 0;
> }
> EXPORT_SYMBOL(bdi_init);
>
> void bdi_destroy(struct backing_dev_info *bdi)
> {
> - int i;
> -
> bdi_wb_shutdown(bdi);
>
> WARN_ON(!list_empty(&bdi->work_list));
> - WARN_ON(delayed_work_pending(&bdi->wb.dwork));
>
> if (bdi->dev) {
> bdi_debug_unregister(bdi);
> @@ -453,8 +467,8 @@ void bdi_destroy(struct backing_dev_info *bdi)
> bdi->dev = NULL;
> }
>
> - for (i = 0; i < NR_BDI_STAT_ITEMS; i++)
> - percpu_counter_destroy(&bdi->bdi_stat[i]);
> + bdi_wb_exit(&bdi->wb);
> +
> fprop_local_destroy_percpu(&bdi->completions);
> }
> EXPORT_SYMBOL(bdi_destroy);
> diff --git a/mm/filemap.c b/mm/filemap.c
> index 21cebb6..a2b098b 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -215,7 +215,7 @@ void __delete_from_page_cache(struct page *page, void *shadow,
> if (PageDirty(page) && mapping_cap_account_dirty(mapping)) {
> mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_DIRTY);
> dec_zone_page_state(page, NR_FILE_DIRTY);
> - dec_bdi_stat(inode_to_bdi(mapping->host), BDI_RECLAIMABLE);
> + dec_wb_stat(&inode_to_bdi(mapping->host)->wb, WB_RECLAIMABLE);
> }
> }
>
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index 9b6277a..af3edb6 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -396,11 +396,11 @@ static unsigned long wp_next_time(unsigned long cur_time)
> * Increment the BDI's writeout completion count and the global writeout
> * completion count. Called from test_clear_page_writeback().
> */
> -static inline void __bdi_writeout_inc(struct backing_dev_info *bdi)
> +static inline void __wb_writeout_inc(struct bdi_writeback *wb)
> {
> - __inc_bdi_stat(bdi, BDI_WRITTEN);
> - __fprop_inc_percpu_max(&writeout_completions, &bdi->completions,
> - bdi->max_prop_frac);
> + __inc_wb_stat(wb, WB_WRITTEN);
> + __fprop_inc_percpu_max(&writeout_completions, &wb->bdi->completions,
> + wb->bdi->max_prop_frac);
> /* First event after period switching was turned off? */
> if (!unlikely(writeout_period_time)) {
> /*
> @@ -414,15 +414,15 @@ static inline void __bdi_writeout_inc(struct backing_dev_info *bdi)
> }
> }
>
> -void bdi_writeout_inc(struct backing_dev_info *bdi)
> +void wb_writeout_inc(struct bdi_writeback *wb)
> {
> unsigned long flags;
>
> local_irq_save(flags);
> - __bdi_writeout_inc(bdi);
> + __wb_writeout_inc(wb);
> local_irq_restore(flags);
> }
> -EXPORT_SYMBOL_GPL(bdi_writeout_inc);
> +EXPORT_SYMBOL_GPL(wb_writeout_inc);
>
> /*
> * Obtain an accurate fraction of the BDI's portion.
> @@ -1130,8 +1130,8 @@ void __bdi_update_bandwidth(struct backing_dev_info *bdi,
> if (elapsed < BANDWIDTH_INTERVAL)
> return;
>
> - dirtied = percpu_counter_read(&bdi->bdi_stat[BDI_DIRTIED]);
> - written = percpu_counter_read(&bdi->bdi_stat[BDI_WRITTEN]);
> + dirtied = percpu_counter_read(&bdi->wb.stat[WB_DIRTIED]);
> + written = percpu_counter_read(&bdi->wb.stat[WB_WRITTEN]);
>
> /*
> * Skip quiet periods when disk bandwidth is under-utilized.
> @@ -1288,7 +1288,8 @@ static inline void bdi_dirty_limits(struct backing_dev_info *bdi,
> unsigned long *bdi_thresh,
> unsigned long *bdi_bg_thresh)
> {
> - unsigned long bdi_reclaimable;
> + struct bdi_writeback *wb = &bdi->wb;
> + unsigned long wb_reclaimable;
>
> /*
> * bdi_thresh is not treated as some limiting factor as
> @@ -1320,14 +1321,12 @@ static inline void bdi_dirty_limits(struct backing_dev_info *bdi,
> * actually dirty; with m+n sitting in the percpu
> * deltas.
> */
> - if (*bdi_thresh < 2 * bdi_stat_error(bdi)) {
> - bdi_reclaimable = bdi_stat_sum(bdi, BDI_RECLAIMABLE);
> - *bdi_dirty = bdi_reclaimable +
> - bdi_stat_sum(bdi, BDI_WRITEBACK);
> + if (*bdi_thresh < 2 * wb_stat_error(wb)) {
> + wb_reclaimable = wb_stat_sum(wb, WB_RECLAIMABLE);
> + *bdi_dirty = wb_reclaimable + wb_stat_sum(wb, WB_WRITEBACK);
> } else {
> - bdi_reclaimable = bdi_stat(bdi, BDI_RECLAIMABLE);
> - *bdi_dirty = bdi_reclaimable +
> - bdi_stat(bdi, BDI_WRITEBACK);
> + wb_reclaimable = wb_stat(wb, WB_RECLAIMABLE);
> + *bdi_dirty = wb_reclaimable + wb_stat(wb, WB_WRITEBACK);
> }
> }
>
> @@ -1514,9 +1513,9 @@ pause:
> * In theory 1 page is enough to keep the comsumer-producer
> * pipe going: the flusher cleans 1 page => the task dirties 1
> * more page. However bdi_dirty has accounting errors. So use
> - * the larger and more IO friendly bdi_stat_error.
> + * the larger and more IO friendly wb_stat_error.
> */
> - if (bdi_dirty <= bdi_stat_error(bdi))
> + if (bdi_dirty <= wb_stat_error(&bdi->wb))
> break;
>
> if (fatal_signal_pending(current))
> @@ -2106,8 +2105,8 @@ void account_page_dirtied(struct page *page, struct address_space *mapping,
> mem_cgroup_inc_page_stat(memcg, MEM_CGROUP_STAT_DIRTY);
> __inc_zone_page_state(page, NR_FILE_DIRTY);
> __inc_zone_page_state(page, NR_DIRTIED);
> - __inc_bdi_stat(bdi, BDI_RECLAIMABLE);
> - __inc_bdi_stat(bdi, BDI_DIRTIED);
> + __inc_wb_stat(&bdi->wb, WB_RECLAIMABLE);
> + __inc_wb_stat(&bdi->wb, WB_DIRTIED);
> task_io_account_write(PAGE_CACHE_SIZE);
> current->nr_dirtied++;
> this_cpu_inc(bdp_ratelimits);
> @@ -2174,7 +2173,7 @@ void account_page_redirty(struct page *page)
> if (mapping && mapping_cap_account_dirty(mapping)) {
> current->nr_dirtied--;
> dec_zone_page_state(page, NR_DIRTIED);
> - dec_bdi_stat(inode_to_bdi(mapping->host), BDI_DIRTIED);
> + dec_wb_stat(&inode_to_bdi(mapping->host)->wb, WB_DIRTIED);
> }
> }
> EXPORT_SYMBOL(account_page_redirty);
> @@ -2320,8 +2319,8 @@ int clear_page_dirty_for_io(struct page *page)
> if (TestClearPageDirty(page)) {
> mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_DIRTY);
> dec_zone_page_state(page, NR_FILE_DIRTY);
> - dec_bdi_stat(inode_to_bdi(mapping->host),
> - BDI_RECLAIMABLE);
> + dec_wb_stat(&inode_to_bdi(mapping->host)->wb,
> + WB_RECLAIMABLE);
> ret = 1;
> }
> mem_cgroup_end_page_stat(memcg);
> @@ -2349,8 +2348,8 @@ int test_clear_page_writeback(struct page *page)
> page_index(page),
> PAGECACHE_TAG_WRITEBACK);
> if (bdi_cap_account_writeback(bdi)) {
> - __dec_bdi_stat(bdi, BDI_WRITEBACK);
> - __bdi_writeout_inc(bdi);
> + __dec_wb_stat(&bdi->wb, WB_WRITEBACK);
> + __wb_writeout_inc(&bdi->wb);
> }
> }
> spin_unlock_irqrestore(&mapping->tree_lock, flags);
> @@ -2384,7 +2383,7 @@ int __test_set_page_writeback(struct page *page, bool keep_write)
> page_index(page),
> PAGECACHE_TAG_WRITEBACK);
> if (bdi_cap_account_writeback(bdi))
> - __inc_bdi_stat(bdi, BDI_WRITEBACK);
> + __inc_wb_stat(&bdi->wb, WB_WRITEBACK);
> }
> if (!PageDirty(page))
> radix_tree_tag_clear(&mapping->page_tree,
> diff --git a/mm/truncate.c b/mm/truncate.c
> index 059cac7..df16f8c 100644
> --- a/mm/truncate.c
> +++ b/mm/truncate.c
> @@ -116,8 +116,8 @@ void cancel_dirty_page(struct page *page, unsigned int account_size)
> if (mapping && mapping_cap_account_dirty(mapping)) {
> mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_DIRTY);
> dec_zone_page_state(page, NR_FILE_DIRTY);
> - dec_bdi_stat(inode_to_bdi(mapping->host),
> - BDI_RECLAIMABLE);
> + dec_wb_stat(&inode_to_bdi(mapping->host)->wb,
> + WB_RECLAIMABLE);
> if (account_size)
> task_io_account_cancelled_write(account_size);
> }
> --
> 2.1.0
>
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR


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