#include <trace/events/writeback.h>
struct backing_dev_info noop_backing_dev_info = {
- .name = "noop",
.capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
};
EXPORT_SYMBOL_GPL(noop_backing_dev_info);
#define INIT_BW (100 << (20 - PAGE_SHIFT))
static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
- int blkcg_id, gfp_t gfp)
+ gfp_t gfp)
{
int i, err;
INIT_DELAYED_WORK(&wb->dwork, wb_workfn);
wb->dirty_sleep = jiffies;
- wb->congested = wb_congested_get_create(bdi, blkcg_id, gfp);
- if (!wb->congested) {
- err = -ENOMEM;
- goto out_put_bdi;
- }
-
err = fprop_local_init_percpu(&wb->completions, gfp);
if (err)
- goto out_put_cong;
+ goto out_put_bdi;
for (i = 0; i < NR_WB_STAT_ITEMS; i++) {
err = percpu_counter_init(&wb->stat[i], 0, gfp);
while (i--)
percpu_counter_destroy(&wb->stat[i]);
fprop_local_destroy_percpu(&wb->completions);
-out_put_cong:
- wb_congested_put(wb->congested);
out_put_bdi:
if (wb != &bdi->wb)
bdi_put(bdi);
percpu_counter_destroy(&wb->stat[i]);
fprop_local_destroy_percpu(&wb->completions);
- wb_congested_put(wb->congested);
if (wb != &wb->bdi->wb)
bdi_put(wb->bdi);
}
#include <linux/memcontrol.h>
/*
- * cgwb_lock protects bdi->cgwb_tree, bdi->cgwb_congested_tree,
- * blkcg->cgwb_list, and memcg->cgwb_list. bdi->cgwb_tree is also RCU
- * protected.
+ * cgwb_lock protects bdi->cgwb_tree, blkcg->cgwb_list, and memcg->cgwb_list.
+ * bdi->cgwb_tree is also RCU protected.
*/
static DEFINE_SPINLOCK(cgwb_lock);
static struct workqueue_struct *cgwb_release_wq;
-/**
- * wb_congested_get_create - get or create a wb_congested
- * @bdi: associated bdi
- * @blkcg_id: ID of the associated blkcg
- * @gfp: allocation mask
- *
- * Look up the wb_congested for @blkcg_id on @bdi. If missing, create one.
- * The returned wb_congested has its reference count incremented. Returns
- * NULL on failure.
- */
-struct bdi_writeback_congested *
-wb_congested_get_create(struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp)
-{
- struct bdi_writeback_congested *new_congested = NULL, *congested;
- struct rb_node **node, *parent;
- unsigned long flags;
-retry:
- spin_lock_irqsave(&cgwb_lock, flags);
-
- node = &bdi->cgwb_congested_tree.rb_node;
- parent = NULL;
-
- while (*node != NULL) {
- parent = *node;
- congested = rb_entry(parent, struct bdi_writeback_congested,
- rb_node);
- if (congested->blkcg_id < blkcg_id)
- node = &parent->rb_left;
- else if (congested->blkcg_id > blkcg_id)
- node = &parent->rb_right;
- else
- goto found;
- }
-
- if (new_congested) {
- /* !found and storage for new one already allocated, insert */
- congested = new_congested;
- rb_link_node(&congested->rb_node, parent, node);
- rb_insert_color(&congested->rb_node, &bdi->cgwb_congested_tree);
- spin_unlock_irqrestore(&cgwb_lock, flags);
- return congested;
- }
-
- spin_unlock_irqrestore(&cgwb_lock, flags);
-
- /* allocate storage for new one and retry */
- new_congested = kzalloc(sizeof(*new_congested), gfp);
- if (!new_congested)
- return NULL;
-
- refcount_set(&new_congested->refcnt, 1);
- new_congested->__bdi = bdi;
- new_congested->blkcg_id = blkcg_id;
- goto retry;
-
-found:
- refcount_inc(&congested->refcnt);
- spin_unlock_irqrestore(&cgwb_lock, flags);
- kfree(new_congested);
- return congested;
-}
-
-/**
- * wb_congested_put - put a wb_congested
- * @congested: wb_congested to put
- *
- * Put @congested and destroy it if the refcnt reaches zero.
- */
-void wb_congested_put(struct bdi_writeback_congested *congested)
-{
- unsigned long flags;
-
- if (!refcount_dec_and_lock_irqsave(&congested->refcnt, &cgwb_lock, &flags))
- return;
-
- /* bdi might already have been destroyed leaving @congested unlinked */
- if (congested->__bdi) {
- rb_erase(&congested->rb_node,
- &congested->__bdi->cgwb_congested_tree);
- congested->__bdi = NULL;
- }
-
- spin_unlock_irqrestore(&cgwb_lock, flags);
- kfree(congested);
-}
-
static void cgwb_release_workfn(struct work_struct *work)
{
struct bdi_writeback *wb = container_of(work, struct bdi_writeback,
goto out_put;
}
- ret = wb_init(wb, bdi, blkcg_css->id, gfp);
+ ret = wb_init(wb, bdi, gfp);
if (ret)
goto err_free;
int ret;
INIT_RADIX_TREE(&bdi->cgwb_tree, GFP_ATOMIC);
- bdi->cgwb_congested_tree = RB_ROOT;
mutex_init(&bdi->cgwb_release_mutex);
init_rwsem(&bdi->wb_switch_rwsem);
- ret = wb_init(&bdi->wb, bdi, 1, GFP_KERNEL);
+ ret = wb_init(&bdi->wb, bdi, GFP_KERNEL);
if (!ret) {
bdi->wb.memcg_css = &root_mem_cgroup->css;
bdi->wb.blkcg_css = blkcg_root_css;
spin_unlock_irq(&cgwb_lock);
}
-static void cgwb_bdi_exit(struct backing_dev_info *bdi)
-{
- struct rb_node *rbn;
-
- spin_lock_irq(&cgwb_lock);
- while ((rbn = rb_first(&bdi->cgwb_congested_tree))) {
- struct bdi_writeback_congested *congested =
- rb_entry(rbn, struct bdi_writeback_congested, rb_node);
-
- rb_erase(rbn, &bdi->cgwb_congested_tree);
- congested->__bdi = NULL; /* mark @congested unlinked */
- }
- spin_unlock_irq(&cgwb_lock);
-}
-
static void cgwb_bdi_register(struct backing_dev_info *bdi)
{
spin_lock_irq(&cgwb_lock);
static int cgwb_bdi_init(struct backing_dev_info *bdi)
{
- int err;
-
- bdi->wb_congested = kzalloc(sizeof(*bdi->wb_congested), GFP_KERNEL);
- if (!bdi->wb_congested)
- return -ENOMEM;
-
- refcount_set(&bdi->wb_congested->refcnt, 1);
-
- err = wb_init(&bdi->wb, bdi, 1, GFP_KERNEL);
- if (err) {
- wb_congested_put(bdi->wb_congested);
- return err;
- }
- return 0;
+ return wb_init(&bdi->wb, bdi, GFP_KERNEL);
}
static void cgwb_bdi_unregister(struct backing_dev_info *bdi) { }
-static void cgwb_bdi_exit(struct backing_dev_info *bdi)
-{
- wb_congested_put(bdi->wb_congested);
-}
-
static void cgwb_bdi_register(struct backing_dev_info *bdi)
{
list_add_tail_rcu(&bdi->wb.bdi_node, &bdi->wb_list);
return ret;
}
-struct backing_dev_info *bdi_alloc_node(gfp_t gfp_mask, int node_id)
+struct backing_dev_info *bdi_alloc(int node_id)
{
struct backing_dev_info *bdi;
- bdi = kmalloc_node(sizeof(struct backing_dev_info),
- gfp_mask | __GFP_ZERO, node_id);
+ bdi = kzalloc_node(sizeof(*bdi), GFP_KERNEL, node_id);
if (!bdi)
return NULL;
}
return bdi;
}
-EXPORT_SYMBOL(bdi_alloc_node);
+EXPORT_SYMBOL(bdi_alloc);
static struct rb_node **bdi_lookup_rb_node(u64 id, struct rb_node **parentp)
{
trace_writeback_bdi_register(bdi);
return 0;
}
-EXPORT_SYMBOL(bdi_register_va);
int bdi_register(struct backing_dev_info *bdi, const char *fmt, ...)
{
}
EXPORT_SYMBOL(bdi_register);
-int bdi_register_owner(struct backing_dev_info *bdi, struct device *owner)
+void bdi_set_owner(struct backing_dev_info *bdi, struct device *owner)
{
- int rc;
-
- rc = bdi_register(bdi, "%u:%u", MAJOR(owner->devt), MINOR(owner->devt));
- if (rc)
- return rc;
- /* Leaking owner reference... */
- WARN_ON(bdi->owner);
+ WARN_ON_ONCE(bdi->owner);
bdi->owner = owner;
get_device(owner);
- return 0;
}
-EXPORT_SYMBOL(bdi_register_owner);
/*
* Remove bdi from bdi_list, and ensure that it is no longer visible
bdi_unregister(bdi);
WARN_ON_ONCE(bdi->dev);
wb_exit(&bdi->wb);
- cgwb_bdi_exit(bdi);
kfree(bdi);
}
};
static atomic_t nr_wb_congested[2];
-void clear_wb_congested(struct bdi_writeback_congested *congested, int sync)
+void clear_bdi_congested(struct backing_dev_info *bdi, int sync)
{
wait_queue_head_t *wqh = &congestion_wqh[sync];
enum wb_congested_state bit;
bit = sync ? WB_sync_congested : WB_async_congested;
- if (test_and_clear_bit(bit, &congested->state))
+ if (test_and_clear_bit(bit, &bdi->wb.congested))
atomic_dec(&nr_wb_congested[sync]);
smp_mb__after_atomic();
if (waitqueue_active(wqh))
wake_up(wqh);
}
-EXPORT_SYMBOL(clear_wb_congested);
+EXPORT_SYMBOL(clear_bdi_congested);
-void set_wb_congested(struct bdi_writeback_congested *congested, int sync)
+void set_bdi_congested(struct backing_dev_info *bdi, int sync)
{
enum wb_congested_state bit;
bit = sync ? WB_sync_congested : WB_async_congested;
- if (!test_and_set_bit(bit, &congested->state))
+ if (!test_and_set_bit(bit, &bdi->wb.congested))
atomic_inc(&nr_wb_congested[sync]);
}
-EXPORT_SYMBOL(set_wb_congested);
+EXPORT_SYMBOL(set_bdi_congested);
/**
* congestion_wait - wait for a backing_dev to become uncongested
projects / linux-2.6-microblaze.git / blobdiff