writeback: provide a wakeup_flusher_threads_bdi()
Similar to wakeup_flusher_threads(), except that we only wake up the flusher threads on the specified backing device. No functional changes in this patch. Acked-by: Johannes Weiner <hannes@cmpxchg.org> Tested-by: Chris Mason <clm@fb.com> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -1946,6 +1946,33 @@ void wb_workfn(struct work_struct *work)
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current->flags &= ~PF_SWAPWRITE;
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}
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/*
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* Start writeback of `nr_pages' pages on this bdi. If `nr_pages' is zero,
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* write back the whole world.
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*/
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static void __wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,
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long nr_pages, enum wb_reason reason)
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{
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struct bdi_writeback *wb;
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if (!bdi_has_dirty_io(bdi))
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return;
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list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node)
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wb_start_writeback(wb, wb_split_bdi_pages(wb, nr_pages),
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reason);
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}
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void wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,
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enum wb_reason reason)
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{
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long nr_pages = get_nr_dirty_pages();
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rcu_read_lock();
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__wakeup_flusher_threads_bdi(bdi, nr_pages, reason);
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rcu_read_unlock();
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}
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/*
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* Wakeup the flusher threads to start writeback of all currently dirty pages
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*/
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@ -1963,16 +1990,8 @@ void wakeup_flusher_threads(enum wb_reason reason)
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nr_pages = get_nr_dirty_pages();
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rcu_read_lock();
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list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) {
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struct bdi_writeback *wb;
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if (!bdi_has_dirty_io(bdi))
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continue;
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list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node)
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wb_start_writeback(wb, wb_split_bdi_pages(wb, nr_pages),
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reason);
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}
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list_for_each_entry_rcu(bdi, &bdi_list, bdi_list)
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__wakeup_flusher_threads_bdi(bdi, nr_pages, reason);
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rcu_read_unlock();
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}
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@ -190,6 +190,8 @@ bool try_to_writeback_inodes_sb_nr(struct super_block *, unsigned long nr,
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enum wb_reason reason);
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void sync_inodes_sb(struct super_block *);
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void wakeup_flusher_threads(enum wb_reason reason);
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void wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,
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enum wb_reason reason);
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void inode_wait_for_writeback(struct inode *inode);
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/* writeback.h requires fs.h; it, too, is not included from here. */
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