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mm/backing-dev.c
25.2 KB
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// SPDX-License-Identifier: GPL-2.0-only |
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#include <linux/wait.h> |
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#include <linux/rbtree.h> |
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#include <linux/backing-dev.h> |
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#include <linux/kthread.h> #include <linux/freezer.h> |
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#include <linux/fs.h> |
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#include <linux/pagemap.h> |
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#include <linux/mm.h> |
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#include <linux/sched.h> #include <linux/module.h> |
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#include <linux/writeback.h> #include <linux/device.h> |
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#include <trace/events/writeback.h> |
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|
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struct backing_dev_info noop_backing_dev_info; |
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EXPORT_SYMBOL_GPL(noop_backing_dev_info); |
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|
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static struct class *bdi_class; |
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static const char *bdi_unknown_name = "(unknown)"; |
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/* |
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* bdi_lock protects bdi_tree and updates to bdi_list. bdi_list has RCU * reader side locking. |
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*/ |
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DEFINE_SPINLOCK(bdi_lock); |
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static u64 bdi_id_cursor; static struct rb_root bdi_tree = RB_ROOT; |
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LIST_HEAD(bdi_list); |
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|
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/* bdi_wq serves all asynchronous writeback tasks */ struct workqueue_struct *bdi_wq; |
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#ifdef CONFIG_DEBUG_FS #include <linux/debugfs.h> #include <linux/seq_file.h> static struct dentry *bdi_debug_root; static void bdi_debug_init(void) { bdi_debug_root = debugfs_create_dir("bdi", NULL); } static int bdi_debug_stats_show(struct seq_file *m, void *v) { struct backing_dev_info *bdi = m->private; |
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struct bdi_writeback *wb = &bdi->wb; |
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unsigned long background_thresh; unsigned long dirty_thresh; |
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unsigned long wb_thresh; |
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unsigned long nr_dirty, nr_io, nr_more_io, nr_dirty_time; |
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struct inode *inode; |
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nr_dirty = nr_io = nr_more_io = nr_dirty_time = 0; |
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spin_lock(&wb->list_lock); |
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list_for_each_entry(inode, &wb->b_dirty, i_io_list) |
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nr_dirty++; |
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list_for_each_entry(inode, &wb->b_io, i_io_list) |
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nr_io++; |
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list_for_each_entry(inode, &wb->b_more_io, i_io_list) |
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nr_more_io++; |
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list_for_each_entry(inode, &wb->b_dirty_time, i_io_list) |
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if (inode->i_state & I_DIRTY_TIME) nr_dirty_time++; |
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spin_unlock(&wb->list_lock); |
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|
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global_dirty_limits(&background_thresh, &dirty_thresh); |
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wb_thresh = wb_calc_thresh(wb, dirty_thresh); |
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#define K(x) ((x) << (PAGE_SHIFT - 10)) seq_printf(m, |
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"BdiWriteback: %10lu kB " "BdiReclaimable: %10lu kB " "BdiDirtyThresh: %10lu kB " "DirtyThresh: %10lu kB " "BackgroundThresh: %10lu kB " |
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"BdiDirtied: %10lu kB " |
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"BdiWritten: %10lu kB " "BdiWriteBandwidth: %10lu kBps " "b_dirty: %10lu " "b_io: %10lu " "b_more_io: %10lu " |
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"b_dirty_time: %10lu " |
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"bdi_list: %10u " "state: %10lx ", |
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(unsigned long) K(wb_stat(wb, WB_WRITEBACK)), (unsigned long) K(wb_stat(wb, WB_RECLAIMABLE)), |
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K(wb_thresh), |
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K(dirty_thresh), K(background_thresh), |
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(unsigned long) K(wb_stat(wb, WB_DIRTIED)), (unsigned long) K(wb_stat(wb, WB_WRITTEN)), |
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(unsigned long) K(wb->write_bandwidth), |
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nr_dirty, nr_io, nr_more_io, |
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nr_dirty_time, |
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!list_empty(&bdi->bdi_list), bdi->wb.state); |
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#undef K return 0; } |
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DEFINE_SHOW_ATTRIBUTE(bdi_debug_stats); |
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|
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static void bdi_debug_register(struct backing_dev_info *bdi, const char *name) |
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{ bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root); |
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|
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debugfs_create_file("stats", 0444, bdi->debug_dir, bdi, &bdi_debug_stats_fops); |
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} static void bdi_debug_unregister(struct backing_dev_info *bdi) { |
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debugfs_remove_recursive(bdi->debug_dir); |
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} #else static inline void bdi_debug_init(void) { } |
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static inline void bdi_debug_register(struct backing_dev_info *bdi, |
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const char *name) { } static inline void bdi_debug_unregister(struct backing_dev_info *bdi) { } #endif |
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static ssize_t read_ahead_kb_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct backing_dev_info *bdi = dev_get_drvdata(dev); |
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unsigned long read_ahead_kb; |
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ssize_t ret; |
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|
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ret = kstrtoul(buf, 10, &read_ahead_kb); if (ret < 0) return ret; bdi->ra_pages = read_ahead_kb >> (PAGE_SHIFT - 10); return count; |
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} #define K(pages) ((pages) << (PAGE_SHIFT - 10)) #define BDI_SHOW(name, expr) \ static ssize_t name##_show(struct device *dev, \ struct device_attribute *attr, char *page) \ { \ struct backing_dev_info *bdi = dev_get_drvdata(dev); \ \ return snprintf(page, PAGE_SIZE-1, "%lld ", (long long)expr); \ |
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} \ static DEVICE_ATTR_RW(name); |
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BDI_SHOW(read_ahead_kb, K(bdi->ra_pages)) |
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static ssize_t min_ratio_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct backing_dev_info *bdi = dev_get_drvdata(dev); |
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unsigned int ratio; |
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ssize_t ret; ret = kstrtouint(buf, 10, &ratio); if (ret < 0) return ret; ret = bdi_set_min_ratio(bdi, ratio); if (!ret) ret = count; |
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|
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return ret; } BDI_SHOW(min_ratio, bdi->min_ratio) |
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static ssize_t max_ratio_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct backing_dev_info *bdi = dev_get_drvdata(dev); |
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unsigned int ratio; |
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ssize_t ret; ret = kstrtouint(buf, 10, &ratio); if (ret < 0) return ret; ret = bdi_set_max_ratio(bdi, ratio); if (!ret) ret = count; |
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|
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return ret; } BDI_SHOW(max_ratio, bdi->max_ratio) |
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static ssize_t stable_pages_required_show(struct device *dev, struct device_attribute *attr, char *page) { |
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dev_warn_once(dev, "the stable_pages_required attribute has been removed. Use the stable_writes queue attribute instead. "); return snprintf(page, PAGE_SIZE-1, "%d ", 0); |
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} |
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static DEVICE_ATTR_RO(stable_pages_required); static struct attribute *bdi_dev_attrs[] = { &dev_attr_read_ahead_kb.attr, &dev_attr_min_ratio.attr, &dev_attr_max_ratio.attr, &dev_attr_stable_pages_required.attr, NULL, |
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}; |
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ATTRIBUTE_GROUPS(bdi_dev); |
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static __init int bdi_class_init(void) { bdi_class = class_create(THIS_MODULE, "bdi"); |
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if (IS_ERR(bdi_class)) return PTR_ERR(bdi_class); |
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bdi_class->dev_groups = bdi_dev_groups; |
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bdi_debug_init(); |
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|
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return 0; } |
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postcore_initcall(bdi_class_init); |
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|
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static int bdi_init(struct backing_dev_info *bdi); |
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static int __init default_bdi_init(void) { int err; |
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bdi_wq = alloc_workqueue("writeback", WQ_MEM_RECLAIM | WQ_UNBOUND | WQ_SYSFS, 0); |
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if (!bdi_wq) return -ENOMEM; |
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err = bdi_init(&noop_backing_dev_info); |
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return err; } subsys_initcall(default_bdi_init); |
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/* |
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* This function is used when the first inode for this wb is marked dirty. It |
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* wakes-up the corresponding bdi thread which should then take care of the * periodic background write-out of dirty inodes. Since the write-out would * starts only 'dirty_writeback_interval' centisecs from now anyway, we just * set up a timer which wakes the bdi thread up later. * * Note, we wouldn't bother setting up the timer, but this function is on the * fast-path (used by '__mark_inode_dirty()'), so we save few context switches * by delaying the wake-up. |
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* * We have to be careful not to postpone flush work if it is scheduled for * earlier. Thus we use queue_delayed_work(). |
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*/ |
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void wb_wakeup_delayed(struct bdi_writeback *wb) |
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{ unsigned long timeout; timeout = msecs_to_jiffies(dirty_writeback_interval * 10); |
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spin_lock_bh(&wb->work_lock); if (test_bit(WB_registered, &wb->state)) queue_delayed_work(bdi_wq, &wb->dwork, timeout); spin_unlock_bh(&wb->work_lock); |
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} |
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/* |
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* Initial write bandwidth: 100 MB/s |
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*/ |
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#define INIT_BW (100 << (20 - PAGE_SHIFT)) |
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|
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static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi, |
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gfp_t gfp) |
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{ |
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int i, err; |
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|
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memset(wb, 0, sizeof(*wb)); |
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|
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if (wb != &bdi->wb) bdi_get(bdi); |
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wb->bdi = bdi; wb->last_old_flush = jiffies; INIT_LIST_HEAD(&wb->b_dirty); INIT_LIST_HEAD(&wb->b_io); INIT_LIST_HEAD(&wb->b_more_io); |
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INIT_LIST_HEAD(&wb->b_dirty_time); |
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spin_lock_init(&wb->list_lock); |
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|
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wb->bw_time_stamp = jiffies; wb->balanced_dirty_ratelimit = INIT_BW; wb->dirty_ratelimit = INIT_BW; wb->write_bandwidth = INIT_BW; wb->avg_write_bandwidth = INIT_BW; |
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|
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spin_lock_init(&wb->work_lock); INIT_LIST_HEAD(&wb->work_list); INIT_DELAYED_WORK(&wb->dwork, wb_workfn); |
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wb->dirty_sleep = jiffies; |
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|
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err = fprop_local_init_percpu(&wb->completions, gfp); |
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if (err) |
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goto out_put_bdi; |
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|
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for (i = 0; i < NR_WB_STAT_ITEMS; i++) { |
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err = percpu_counter_init(&wb->stat[i], 0, gfp); |
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if (err) goto out_destroy_stat; |
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} |
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|
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return 0; |
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out_destroy_stat: |
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while (i--) |
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percpu_counter_destroy(&wb->stat[i]); fprop_local_destroy_percpu(&wb->completions); |
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out_put_bdi: if (wb != &bdi->wb) bdi_put(bdi); |
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return err; |
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} |
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|
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static void cgwb_remove_from_bdi_list(struct bdi_writeback *wb); |
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/* * Remove bdi from the global list and shutdown any threads we have running */ |
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static void wb_shutdown(struct bdi_writeback *wb) |
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{ |
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/* Make sure nobody queues further work */ |
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spin_lock_bh(&wb->work_lock); if (!test_and_clear_bit(WB_registered, &wb->state)) { spin_unlock_bh(&wb->work_lock); |
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return; |
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} |
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spin_unlock_bh(&wb->work_lock); |
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|
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cgwb_remove_from_bdi_list(wb); |
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/* |
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* Drain work list and shutdown the delayed_work. !WB_registered * tells wb_workfn() that @wb is dying and its work_list needs to * be drained no matter what. |
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*/ |
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mod_delayed_work(bdi_wq, &wb->dwork, 0); flush_delayed_work(&wb->dwork); WARN_ON(!list_empty(&wb->work_list)); } |
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static void wb_exit(struct bdi_writeback *wb) |
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{ int i; WARN_ON(delayed_work_pending(&wb->dwork)); for (i = 0; i < NR_WB_STAT_ITEMS; i++) percpu_counter_destroy(&wb->stat[i]); |
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|
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fprop_local_destroy_percpu(&wb->completions); |
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if (wb != &wb->bdi->wb) bdi_put(wb->bdi); |
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} |
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|
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#ifdef CONFIG_CGROUP_WRITEBACK #include <linux/memcontrol.h> /* |
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* cgwb_lock protects bdi->cgwb_tree, blkcg->cgwb_list, and memcg->cgwb_list. * bdi->cgwb_tree is also RCU protected. |
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*/ static DEFINE_SPINLOCK(cgwb_lock); |
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static struct workqueue_struct *cgwb_release_wq; |
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|
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static void cgwb_release_workfn(struct work_struct *work) { struct bdi_writeback *wb = container_of(work, struct bdi_writeback, release_work); |
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struct blkcg *blkcg = css_to_blkcg(wb->blkcg_css); |
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|
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mutex_lock(&wb->bdi->cgwb_release_mutex); |
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wb_shutdown(wb); css_put(wb->memcg_css); css_put(wb->blkcg_css); |
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mutex_unlock(&wb->bdi->cgwb_release_mutex); |
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|
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/* triggers blkg destruction if no online users left */ blkcg_unpin_online(blkcg); |
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|
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fprop_local_destroy_percpu(&wb->memcg_completions); |
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percpu_ref_exit(&wb->refcnt); wb_exit(wb); kfree_rcu(wb, rcu); |
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} static void cgwb_release(struct percpu_ref *refcnt) { struct bdi_writeback *wb = container_of(refcnt, struct bdi_writeback, refcnt); |
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queue_work(cgwb_release_wq, &wb->release_work); |
52ebea749 writeback: make b... |
411 412 413 414 415 416 417 418 419 420 421 |
} static void cgwb_kill(struct bdi_writeback *wb) { lockdep_assert_held(&cgwb_lock); WARN_ON(!radix_tree_delete(&wb->bdi->cgwb_tree, wb->memcg_css->id)); list_del(&wb->memcg_node); list_del(&wb->blkcg_node); percpu_ref_kill(&wb->refcnt); } |
e8cb72b32 bdi: Unify bdi->w... |
422 423 424 425 426 427 |
static void cgwb_remove_from_bdi_list(struct bdi_writeback *wb) { spin_lock_irq(&cgwb_lock); list_del_rcu(&wb->bdi_node); spin_unlock_irq(&cgwb_lock); } |
52ebea749 writeback: make b... |
428 429 430 431 432 433 434 435 436 437 438 439 |
static int cgwb_create(struct backing_dev_info *bdi, struct cgroup_subsys_state *memcg_css, gfp_t gfp) { struct mem_cgroup *memcg; struct cgroup_subsys_state *blkcg_css; struct blkcg *blkcg; struct list_head *memcg_cgwb_list, *blkcg_cgwb_list; struct bdi_writeback *wb; unsigned long flags; int ret = 0; memcg = mem_cgroup_from_css(memcg_css); |
c165b3e3c blkcg: rename sub... |
440 |
blkcg_css = cgroup_get_e_css(memcg_css->cgroup, &io_cgrp_subsys); |
52ebea749 writeback: make b... |
441 |
blkcg = css_to_blkcg(blkcg_css); |
9ccc36171 memcg: writeback:... |
442 |
memcg_cgwb_list = &memcg->cgwb_list; |
52ebea749 writeback: make b... |
443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 |
blkcg_cgwb_list = &blkcg->cgwb_list; /* look up again under lock and discard on blkcg mismatch */ spin_lock_irqsave(&cgwb_lock, flags); wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id); if (wb && wb->blkcg_css != blkcg_css) { cgwb_kill(wb); wb = NULL; } spin_unlock_irqrestore(&cgwb_lock, flags); if (wb) goto out_put; /* need to create a new one */ wb = kmalloc(sizeof(*wb), gfp); |
0b045bd1c mm/backing-dev.c:... |
458 459 460 461 |
if (!wb) { ret = -ENOMEM; goto out_put; } |
52ebea749 writeback: make b... |
462 |
|
8c911f3d4 writeback: remove... |
463 |
ret = wb_init(wb, bdi, gfp); |
52ebea749 writeback: make b... |
464 465 466 467 468 469 |
if (ret) goto err_free; ret = percpu_ref_init(&wb->refcnt, cgwb_release, 0, gfp); if (ret) goto err_wb_exit; |
841710aa6 writeback: implem... |
470 471 472 |
ret = fprop_local_init_percpu(&wb->memcg_completions, gfp); if (ret) goto err_ref_exit; |
52ebea749 writeback: make b... |
473 474 475 476 |
wb->memcg_css = memcg_css; wb->blkcg_css = blkcg_css; INIT_WORK(&wb->release_work, cgwb_release_workfn); set_bit(WB_registered, &wb->state); |
03ba3782e writeback: switch... |
477 478 |
/* |
52ebea749 writeback: make b... |
479 480 481 482 |
* The root wb determines the registered state of the whole bdi and * memcg_cgwb_list and blkcg_cgwb_list's next pointers indicate * whether they're still online. Don't link @wb if any is dead. * See wb_memcg_offline() and wb_blkcg_offline(). |
03ba3782e writeback: switch... |
483 |
*/ |
52ebea749 writeback: make b... |
484 485 486 487 488 489 490 |
ret = -ENODEV; spin_lock_irqsave(&cgwb_lock, flags); if (test_bit(WB_registered, &bdi->wb.state) && blkcg_cgwb_list->next && memcg_cgwb_list->next) { /* we might have raced another instance of this function */ ret = radix_tree_insert(&bdi->cgwb_tree, memcg_css->id, wb); if (!ret) { |
b817525a4 writeback: bdi_wr... |
491 |
list_add_tail_rcu(&wb->bdi_node, &bdi->wb_list); |
52ebea749 writeback: make b... |
492 493 |
list_add(&wb->memcg_node, memcg_cgwb_list); list_add(&wb->blkcg_node, blkcg_cgwb_list); |
d866dbf61 blkcg: rename blk... |
494 |
blkcg_pin_online(blkcg); |
52ebea749 writeback: make b... |
495 496 497 498 499 500 501 502 |
css_get(memcg_css); css_get(blkcg_css); } } spin_unlock_irqrestore(&cgwb_lock, flags); if (ret) { if (ret == -EEXIST) ret = 0; |
a13f35e87 writeback: don't ... |
503 |
goto err_fprop_exit; |
52ebea749 writeback: make b... |
504 505 |
} goto out_put; |
841710aa6 writeback: implem... |
506 507 |
err_fprop_exit: fprop_local_destroy_percpu(&wb->memcg_completions); |
52ebea749 writeback: make b... |
508 509 510 511 512 513 514 515 516 |
err_ref_exit: percpu_ref_exit(&wb->refcnt); err_wb_exit: wb_exit(wb); err_free: kfree(wb); out_put: css_put(blkcg_css); return ret; |
66f3b8e2e writeback: move d... |
517 |
} |
52ebea749 writeback: make b... |
518 |
/** |
ed288dc0d writeback: Separa... |
519 |
* wb_get_lookup - get wb for a given memcg |
52ebea749 writeback: make b... |
520 521 |
* @bdi: target bdi * @memcg_css: cgroup_subsys_state of the target memcg (must have positive ref) |
52ebea749 writeback: make b... |
522 |
* |
ed288dc0d writeback: Separa... |
523 524 |
* Try to get the wb for @memcg_css on @bdi. The returned wb has its * refcount incremented. |
52ebea749 writeback: make b... |
525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 |
* * This function uses css_get() on @memcg_css and thus expects its refcnt * to be positive on invocation. IOW, rcu_read_lock() protection on * @memcg_css isn't enough. try_get it before calling this function. * * A wb is keyed by its associated memcg. As blkcg implicitly enables * memcg on the default hierarchy, memcg association is guaranteed to be * more specific (equal or descendant to the associated blkcg) and thus can * identify both the memcg and blkcg associations. * * Because the blkcg associated with a memcg may change as blkcg is enabled * and disabled closer to root in the hierarchy, each wb keeps track of * both the memcg and blkcg associated with it and verifies the blkcg on * each lookup. On mismatch, the existing wb is discarded and a new one is * created. */ |
ed288dc0d writeback: Separa... |
541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 |
struct bdi_writeback *wb_get_lookup(struct backing_dev_info *bdi, struct cgroup_subsys_state *memcg_css) { struct bdi_writeback *wb; if (!memcg_css->parent) return &bdi->wb; rcu_read_lock(); wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id); if (wb) { struct cgroup_subsys_state *blkcg_css; /* see whether the blkcg association has changed */ blkcg_css = cgroup_get_e_css(memcg_css->cgroup, &io_cgrp_subsys); if (unlikely(wb->blkcg_css != blkcg_css || !wb_tryget(wb))) wb = NULL; css_put(blkcg_css); } rcu_read_unlock(); return wb; } /** * wb_get_create - get wb for a given memcg, create if necessary * @bdi: target bdi * @memcg_css: cgroup_subsys_state of the target memcg (must have positive ref) * @gfp: allocation mask to use * * Try to get the wb for @memcg_css on @bdi. If it doesn't exist, try to * create one. See wb_get_lookup() for more details. */ |
52ebea749 writeback: make b... |
574 575 576 |
struct bdi_writeback *wb_get_create(struct backing_dev_info *bdi, struct cgroup_subsys_state *memcg_css, gfp_t gfp) |
6467716a3 writeback: optimi... |
577 |
{ |
52ebea749 writeback: make b... |
578 |
struct bdi_writeback *wb; |
d0164adc8 mm, page_alloc: d... |
579 |
might_sleep_if(gfpflags_allow_blocking(gfp)); |
52ebea749 writeback: make b... |
580 581 582 583 584 |
if (!memcg_css->parent) return &bdi->wb; do { |
ed288dc0d writeback: Separa... |
585 |
wb = wb_get_lookup(bdi, memcg_css); |
52ebea749 writeback: make b... |
586 587 588 589 |
} while (!wb && !cgwb_create(bdi, memcg_css, gfp)); return wb; } |
6467716a3 writeback: optimi... |
590 |
|
a13f35e87 writeback: don't ... |
591 |
static int cgwb_bdi_init(struct backing_dev_info *bdi) |
52ebea749 writeback: make b... |
592 |
{ |
a13f35e87 writeback: don't ... |
593 |
int ret; |
52ebea749 writeback: make b... |
594 |
INIT_RADIX_TREE(&bdi->cgwb_tree, GFP_ATOMIC); |
3ee7e8697 bdi: Fix another ... |
595 |
mutex_init(&bdi->cgwb_release_mutex); |
7fc5854f8 writeback: synchr... |
596 |
init_rwsem(&bdi->wb_switch_rwsem); |
a13f35e87 writeback: don't ... |
597 |
|
8c911f3d4 writeback: remove... |
598 |
ret = wb_init(&bdi->wb, bdi, GFP_KERNEL); |
a13f35e87 writeback: don't ... |
599 |
if (!ret) { |
7d828602e mm: memcontrol: e... |
600 |
bdi->wb.memcg_css = &root_mem_cgroup->css; |
a13f35e87 writeback: don't ... |
601 602 603 |
bdi->wb.blkcg_css = blkcg_root_css; } return ret; |
6467716a3 writeback: optimi... |
604 |
} |
b1c51afc0 bdi: Rename cgwb_... |
605 |
static void cgwb_bdi_unregister(struct backing_dev_info *bdi) |
52ebea749 writeback: make b... |
606 607 608 |
{ struct radix_tree_iter iter; void **slot; |
5318ce7d4 bdi: Shutdown wri... |
609 |
struct bdi_writeback *wb; |
52ebea749 writeback: make b... |
610 611 612 613 614 615 |
WARN_ON(test_bit(WB_registered, &bdi->wb.state)); spin_lock_irq(&cgwb_lock); radix_tree_for_each_slot(slot, &bdi->cgwb_tree, &iter, 0) cgwb_kill(*slot); |
3ee7e8697 bdi: Fix another ... |
616 |
spin_unlock_irq(&cgwb_lock); |
5318ce7d4 bdi: Shutdown wri... |
617 |
|
3ee7e8697 bdi: Fix another ... |
618 619 |
mutex_lock(&bdi->cgwb_release_mutex); spin_lock_irq(&cgwb_lock); |
5318ce7d4 bdi: Shutdown wri... |
620 621 622 623 624 625 626 |
while (!list_empty(&bdi->wb_list)) { wb = list_first_entry(&bdi->wb_list, struct bdi_writeback, bdi_node); spin_unlock_irq(&cgwb_lock); wb_shutdown(wb); spin_lock_irq(&cgwb_lock); } |
52ebea749 writeback: make b... |
627 |
spin_unlock_irq(&cgwb_lock); |
3ee7e8697 bdi: Fix another ... |
628 |
mutex_unlock(&bdi->cgwb_release_mutex); |
52ebea749 writeback: make b... |
629 630 631 632 633 634 635 |
} /** * wb_memcg_offline - kill all wb's associated with a memcg being offlined * @memcg: memcg being offlined * * Also prevents creation of any new wb's associated with @memcg. |
e98be2d59 writeback: bdi wr... |
636 |
*/ |
52ebea749 writeback: make b... |
637 638 |
void wb_memcg_offline(struct mem_cgroup *memcg) { |
9ccc36171 memcg: writeback:... |
639 |
struct list_head *memcg_cgwb_list = &memcg->cgwb_list; |
52ebea749 writeback: make b... |
640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 |
struct bdi_writeback *wb, *next; spin_lock_irq(&cgwb_lock); list_for_each_entry_safe(wb, next, memcg_cgwb_list, memcg_node) cgwb_kill(wb); memcg_cgwb_list->next = NULL; /* prevent new wb's */ spin_unlock_irq(&cgwb_lock); } /** * wb_blkcg_offline - kill all wb's associated with a blkcg being offlined * @blkcg: blkcg being offlined * * Also prevents creation of any new wb's associated with @blkcg. */ void wb_blkcg_offline(struct blkcg *blkcg) { |
52ebea749 writeback: make b... |
657 658 659 660 661 662 663 664 |
struct bdi_writeback *wb, *next; spin_lock_irq(&cgwb_lock); list_for_each_entry_safe(wb, next, &blkcg->cgwb_list, blkcg_node) cgwb_kill(wb); blkcg->cgwb_list.next = NULL; /* prevent new wb's */ spin_unlock_irq(&cgwb_lock); } |
e8cb72b32 bdi: Unify bdi->w... |
665 666 667 668 669 670 |
static void cgwb_bdi_register(struct backing_dev_info *bdi) { spin_lock_irq(&cgwb_lock); list_add_tail_rcu(&bdi->wb.bdi_node, &bdi->wb_list); spin_unlock_irq(&cgwb_lock); } |
f18346468 bdi: Move cgroup ... |
671 672 673 674 675 676 677 678 679 680 681 682 683 684 |
static int __init cgwb_init(void) { /* * There can be many concurrent release work items overwhelming * system_wq. Put them in a separate wq and limit concurrency. * There's no point in executing many of these in parallel. */ cgwb_release_wq = alloc_workqueue("cgwb_release", 0, 1); if (!cgwb_release_wq) return -ENOMEM; return 0; } subsys_initcall(cgwb_init); |
52ebea749 writeback: make b... |
685 |
#else /* CONFIG_CGROUP_WRITEBACK */ |
a13f35e87 writeback: don't ... |
686 687 |
static int cgwb_bdi_init(struct backing_dev_info *bdi) { |
8c911f3d4 writeback: remove... |
688 |
return wb_init(&bdi->wb, bdi, GFP_KERNEL); |
a13f35e87 writeback: don't ... |
689 |
} |
b1c51afc0 bdi: Rename cgwb_... |
690 |
static void cgwb_bdi_unregister(struct backing_dev_info *bdi) { } |
df23de556 bdi: Fix use-afte... |
691 |
|
e8cb72b32 bdi: Unify bdi->w... |
692 693 694 695 696 697 698 699 700 |
static void cgwb_bdi_register(struct backing_dev_info *bdi) { list_add_tail_rcu(&bdi->wb.bdi_node, &bdi->wb_list); } static void cgwb_remove_from_bdi_list(struct bdi_writeback *wb) { list_del_rcu(&wb->bdi_node); } |
52ebea749 writeback: make b... |
701 |
#endif /* CONFIG_CGROUP_WRITEBACK */ |
e98be2d59 writeback: bdi wr... |
702 |
|
2e82b84c0 block: Remove unu... |
703 |
static int bdi_init(struct backing_dev_info *bdi) |
b2e8fb6ef mm: scalable bdi ... |
704 |
{ |
b817525a4 writeback: bdi_wr... |
705 |
int ret; |
cf0ca9fe5 mm: bdi: export B... |
706 |
bdi->dev = NULL; |
d03f6cdc1 block: Dynamicall... |
707 |
kref_init(&bdi->refcnt); |
189d3c4a9 mm: bdi: allow se... |
708 |
bdi->min_ratio = 0; |
a42dde041 mm: bdi: allow se... |
709 |
bdi->max_ratio = 100; |
eb608e3a3 block: Convert BD... |
710 |
bdi->max_prop_frac = FPROP_FRAC_BASE; |
66f3b8e2e writeback: move d... |
711 |
INIT_LIST_HEAD(&bdi->bdi_list); |
b817525a4 writeback: bdi_wr... |
712 |
INIT_LIST_HEAD(&bdi->wb_list); |
cc395d7f1 writeback: implem... |
713 |
init_waitqueue_head(&bdi->wb_waitq); |
03ba3782e writeback: switch... |
714 |
|
b817525a4 writeback: bdi_wr... |
715 |
ret = cgwb_bdi_init(bdi); |
b817525a4 writeback: bdi_wr... |
716 |
return ret; |
b2e8fb6ef mm: scalable bdi ... |
717 |
} |
e98be2d59 writeback: bdi wr... |
718 |
|
aef33c2ff bdi: simplify bdi... |
719 |
struct backing_dev_info *bdi_alloc(int node_id) |
d03f6cdc1 block: Dynamicall... |
720 721 |
{ struct backing_dev_info *bdi; |
aef33c2ff bdi: simplify bdi... |
722 |
bdi = kzalloc_node(sizeof(*bdi), GFP_KERNEL, node_id); |
d03f6cdc1 block: Dynamicall... |
723 724 725 726 727 728 729 |
if (!bdi) return NULL; if (bdi_init(bdi)) { kfree(bdi); return NULL; } |
f56753ac2 bdi: replace BDI_... |
730 |
bdi->capabilities = BDI_CAP_WRITEBACK | BDI_CAP_WRITEBACK_ACCT; |
55b2598e8 bdi: initialize -... |
731 732 |
bdi->ra_pages = VM_READAHEAD_PAGES; bdi->io_pages = VM_READAHEAD_PAGES; |
d03f6cdc1 block: Dynamicall... |
733 734 |
return bdi; } |
aef33c2ff bdi: simplify bdi... |
735 |
EXPORT_SYMBOL(bdi_alloc); |
d03f6cdc1 block: Dynamicall... |
736 |
|
34f8fe501 bdi: Add bdi->id |
737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 |
static struct rb_node **bdi_lookup_rb_node(u64 id, struct rb_node **parentp) { struct rb_node **p = &bdi_tree.rb_node; struct rb_node *parent = NULL; struct backing_dev_info *bdi; lockdep_assert_held(&bdi_lock); while (*p) { parent = *p; bdi = rb_entry(parent, struct backing_dev_info, rb_node); if (bdi->id > id) p = &(*p)->rb_left; else if (bdi->id < id) p = &(*p)->rb_right; else break; } if (parentp) *parentp = parent; return p; } /** * bdi_get_by_id - lookup and get bdi from its id * @id: bdi id to lookup * * Find bdi matching @id and get it. Returns NULL if the matching bdi * doesn't exist or is already unregistered. */ struct backing_dev_info *bdi_get_by_id(u64 id) { struct backing_dev_info *bdi = NULL; struct rb_node **p; spin_lock_bh(&bdi_lock); p = bdi_lookup_rb_node(id, NULL); if (*p) { bdi = rb_entry(*p, struct backing_dev_info, rb_node); bdi_get(bdi); } spin_unlock_bh(&bdi_lock); return bdi; } |
7c4cc3002 bdi: Drop 'parent... |
784 |
int bdi_register_va(struct backing_dev_info *bdi, const char *fmt, va_list args) |
461000714 writeback: reorga... |
785 |
{ |
461000714 writeback: reorga... |
786 |
struct device *dev; |
34f8fe501 bdi: Add bdi->id |
787 |
struct rb_node *parent, **p; |
e98be2d59 writeback: bdi wr... |
788 |
|
461000714 writeback: reorga... |
789 790 |
if (bdi->dev) /* The driver needs to use separate queues per device */ return 0; |
e98be2d59 writeback: bdi wr... |
791 |
|
6bd87eec2 bdi: add a ->dev_... |
792 793 |
vsnprintf(bdi->dev_name, sizeof(bdi->dev_name), fmt, args); dev = device_create(bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name); |
461000714 writeback: reorga... |
794 795 |
if (IS_ERR(dev)) return PTR_ERR(dev); |
04fbfdc14 mm: per device di... |
796 |
|
e8cb72b32 bdi: Unify bdi->w... |
797 |
cgwb_bdi_register(bdi); |
461000714 writeback: reorga... |
798 |
bdi->dev = dev; |
b2e8fb6ef mm: scalable bdi ... |
799 |
|
6d0e4827b Revert "bdi: add ... |
800 |
bdi_debug_register(bdi, dev_name(dev)); |
461000714 writeback: reorga... |
801 802 803 |
set_bit(WB_registered, &bdi->wb.state); spin_lock_bh(&bdi_lock); |
34f8fe501 bdi: Add bdi->id |
804 805 806 807 808 809 |
bdi->id = ++bdi_id_cursor; p = bdi_lookup_rb_node(bdi->id, &parent); rb_link_node(&bdi->rb_node, parent, p); rb_insert_color(&bdi->rb_node, &bdi_tree); |
461000714 writeback: reorga... |
810 |
list_add_tail_rcu(&bdi->bdi_list, &bdi_list); |
34f8fe501 bdi: Add bdi->id |
811 |
|
461000714 writeback: reorga... |
812 813 814 815 |
spin_unlock_bh(&bdi_lock); trace_writeback_bdi_register(bdi); return 0; |
b2e8fb6ef mm: scalable bdi ... |
816 |
} |
baf7a616d bdi: Provide bdi_... |
817 |
|
7c4cc3002 bdi: Drop 'parent... |
818 |
int bdi_register(struct backing_dev_info *bdi, const char *fmt, ...) |
baf7a616d bdi: Provide bdi_... |
819 820 821 822 823 |
{ va_list args; int ret; va_start(args, fmt); |
7c4cc3002 bdi: Drop 'parent... |
824 |
ret = bdi_register_va(bdi, fmt, args); |
baf7a616d bdi: Provide bdi_... |
825 826 827 |
va_end(args); return ret; } |
461000714 writeback: reorga... |
828 |
EXPORT_SYMBOL(bdi_register); |
b2e8fb6ef mm: scalable bdi ... |
829 |
|
3c5d202b5 bdi: remove bdi_r... |
830 |
void bdi_set_owner(struct backing_dev_info *bdi, struct device *owner) |
df08c32ce block: fix bdi vs... |
831 |
{ |
3c5d202b5 bdi: remove bdi_r... |
832 |
WARN_ON_ONCE(bdi->owner); |
df08c32ce block: fix bdi vs... |
833 834 |
bdi->owner = owner; get_device(owner); |
df08c32ce block: fix bdi vs... |
835 |
} |
df08c32ce block: fix bdi vs... |
836 |
|
461000714 writeback: reorga... |
837 838 839 840 841 842 |
/* * Remove bdi from bdi_list, and ensure that it is no longer visible */ static void bdi_remove_from_list(struct backing_dev_info *bdi) { spin_lock_bh(&bdi_lock); |
34f8fe501 bdi: Add bdi->id |
843 |
rb_erase(&bdi->rb_node, &bdi_tree); |
461000714 writeback: reorga... |
844 845 |
list_del_rcu(&bdi->bdi_list); spin_unlock_bh(&bdi_lock); |
b2e8fb6ef mm: scalable bdi ... |
846 |
|
461000714 writeback: reorga... |
847 848 |
synchronize_rcu_expedited(); } |
cf0ca9fe5 mm: bdi: export B... |
849 |
|
b02176f30 block: don't rele... |
850 |
void bdi_unregister(struct backing_dev_info *bdi) |
b2e8fb6ef mm: scalable bdi ... |
851 |
{ |
f0054bb1e writeback: move b... |
852 853 854 |
/* make sure nobody finds us on the bdi_list anymore */ bdi_remove_from_list(bdi); wb_shutdown(&bdi->wb); |
b1c51afc0 bdi: Rename cgwb_... |
855 |
cgwb_bdi_unregister(bdi); |
7a401a972 backing-dev: ensu... |
856 |
|
c4db59d31 fs: don't reassig... |
857 858 859 860 861 |
if (bdi->dev) { bdi_debug_unregister(bdi); device_unregister(bdi->dev); bdi->dev = NULL; } |
df08c32ce block: fix bdi vs... |
862 863 864 865 866 |
if (bdi->owner) { put_device(bdi->owner); bdi->owner = NULL; } |
b02176f30 block: don't rele... |
867 |
} |
c4db59d31 fs: don't reassig... |
868 |
|
d03f6cdc1 block: Dynamicall... |
869 870 871 872 |
static void release_bdi(struct kref *ref) { struct backing_dev_info *bdi = container_of(ref, struct backing_dev_info, refcnt); |
5af110b2f block: Unregister... |
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if (test_bit(WB_registered, &bdi->wb.state)) bdi_unregister(bdi); |
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WARN_ON_ONCE(bdi->dev); wb_exit(&bdi->wb); |
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kfree(bdi); } void bdi_put(struct backing_dev_info *bdi) { kref_put(&bdi->refcnt, release_bdi); } |
62bf42adc bdi: Export bdi_a... |
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EXPORT_SYMBOL(bdi_put); |
d03f6cdc1 block: Dynamicall... |
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|
eb7ae5e06 bdi: move bdi_dev... |
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const char *bdi_dev_name(struct backing_dev_info *bdi) { if (!bdi || !bdi->dev) return bdi_unknown_name; |
6bd87eec2 bdi: add a ->dev_... |
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return bdi->dev_name; |
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} EXPORT_SYMBOL_GPL(bdi_dev_name); |
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static wait_queue_head_t congestion_wqh[2] = { __WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[0]), __WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[1]) }; |
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static atomic_t nr_wb_congested[2]; |
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|
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void clear_bdi_congested(struct backing_dev_info *bdi, int sync) |
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{ |
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wait_queue_head_t *wqh = &congestion_wqh[sync]; |
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enum wb_congested_state bit; |
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|
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bit = sync ? WB_sync_congested : WB_async_congested; |
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if (test_and_clear_bit(bit, &bdi->wb.congested)) |
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atomic_dec(&nr_wb_congested[sync]); |
4e857c58e arch: Mass conver... |
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smp_mb__after_atomic(); |
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if (waitqueue_active(wqh)) wake_up(wqh); } |
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EXPORT_SYMBOL(clear_bdi_congested); |
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|
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void set_bdi_congested(struct backing_dev_info *bdi, int sync) |
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{ |
c877ef8ae writeback: fix th... |
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enum wb_congested_state bit; |
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|
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bit = sync ? WB_sync_congested : WB_async_congested; |
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if (!test_and_set_bit(bit, &bdi->wb.congested)) |
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atomic_inc(&nr_wb_congested[sync]); |
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} |
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EXPORT_SYMBOL(set_bdi_congested); |
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/** * congestion_wait - wait for a backing_dev to become uncongested |
8aa7e847d Fix congestion_wa... |
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* @sync: SYNC or ASYNC IO |
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* @timeout: timeout in jiffies * * Waits for up to @timeout jiffies for a backing_dev (any backing_dev) to exit * write congestion. If no backing_devs are congested then just wait for the * next write to be completed. */ |
8aa7e847d Fix congestion_wa... |
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long congestion_wait(int sync, long timeout) |
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{ long ret; |
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unsigned long start = jiffies; |
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DEFINE_WAIT(wait); |
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wait_queue_head_t *wqh = &congestion_wqh[sync]; |
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prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE); ret = io_schedule_timeout(timeout); finish_wait(wqh, &wait); |
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trace_writeback_congestion_wait(jiffies_to_usecs(timeout), jiffies_to_usecs(jiffies - start)); |
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return ret; } EXPORT_SYMBOL(congestion_wait); |
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|
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/** |
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* wait_iff_congested - Conditionally wait for a backing_dev to become uncongested or a pgdat to complete writes |
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* @sync: SYNC or ASYNC IO * @timeout: timeout in jiffies * |
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* In the event of a congested backing_dev (any backing_dev) this waits * for up to @timeout jiffies for either a BDI to exit congestion of the * given @sync queue or a write to complete. |
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* * The return value is 0 if the sleep is for the full timeout. Otherwise, * it is the number of jiffies that were still remaining when the function * returned. return_value == timeout implies the function did not sleep. */ |
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long wait_iff_congested(int sync, long timeout) |
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{ long ret; unsigned long start = jiffies; DEFINE_WAIT(wait); wait_queue_head_t *wqh = &congestion_wqh[sync]; /* |
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* If there is no congestion, yield if necessary instead |
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* of sleeping on the congestion queue */ |
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if (atomic_read(&nr_wb_congested[sync]) == 0) { |
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cond_resched(); |
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|
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/* In case we scheduled, work out time remaining */ ret = timeout - (jiffies - start); if (ret < 0) ret = 0; goto out; } /* Sleep until uncongested or a write happens */ prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE); ret = io_schedule_timeout(timeout); finish_wait(wqh, &wait); out: trace_writeback_wait_iff_congested(jiffies_to_usecs(timeout), jiffies_to_usecs(jiffies - start)); return ret; } EXPORT_SYMBOL(wait_iff_congested); |