Hi Jens,
we have a lot of bdi congestion related code that is left around without
any use. This series removes it in preparation of sorting out the bdi
lifetime rules properly.
Diffstat:
block/blk-cgroup.c | 19 ----
drivers/block/drbd/drbd_main.c | 59 --------------
drivers/block/drbd/drbd_proc.c | 1
drivers/md/bcache/request.c | 43 ----------
drivers/md/bcache/super.c | 1
drivers/md/dm-cache-target.c | 19 ----
drivers/md/dm-clone-target.c | 15 ---
drivers/md/dm-era-target.c | 15 ---
drivers/md/dm-raid.c | 12 --
drivers/md/dm-table.c | 37 ---------
drivers/md/dm-thin.c | 16 ---
drivers/md/dm.c | 33 --------
drivers/md/dm.h | 1
drivers/md/md-linear.c | 24 -----
drivers/md/md-multipath.c | 23 -----
drivers/md/md.c | 23 -----
drivers/md/md.h | 4
drivers/md/raid0.c | 16 ---
drivers/md/raid1.c | 31 -------
drivers/md/raid10.c | 26 ------
drivers/md/raid5.c | 25 ------
fs/btrfs/disk-io.c | 23 -----
include/linux/backing-dev-defs.h | 43 ----------
include/linux/backing-dev.h | 22 -----
include/linux/blk-cgroup.h | 6 -
include/linux/device-mapper.h | 11 --
mm/backing-dev.c | 157 +++------------------------------------
27 files changed, 20 insertions(+), 685 deletions(-)
We never set any congested bits in the group writeback instances of it.
And for the simpler bdi-wide case a simple scalar field is all that
that is needed.
Signed-off-by: Christoph Hellwig <[email protected]>
---
block/blk-cgroup.c | 19 +---
drivers/md/dm.c | 2 +-
include/linux/backing-dev-defs.h | 25 +-----
include/linux/backing-dev.h | 18 +---
include/linux/blk-cgroup.h | 6 --
mm/backing-dev.c | 149 ++-----------------------------
6 files changed, 14 insertions(+), 205 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 1ce94afc03bcfd..30dc14ddf0f69c 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -95,9 +95,6 @@ static void __blkg_release(struct rcu_head *rcu)
css_put(&blkg->blkcg->css);
if (blkg->parent)
blkg_put(blkg->parent);
-
- wb_congested_put(blkg->wb_congested);
-
blkg_free(blkg);
}
@@ -227,7 +224,6 @@ static struct blkcg_gq *blkg_create(struct blkcg *blkcg,
struct blkcg_gq *new_blkg)
{
struct blkcg_gq *blkg;
- struct bdi_writeback_congested *wb_congested;
int i, ret;
WARN_ON_ONCE(!rcu_read_lock_held());
@@ -245,31 +241,22 @@ static struct blkcg_gq *blkg_create(struct blkcg *blkcg,
goto err_free_blkg;
}
- wb_congested = wb_congested_get_create(q->backing_dev_info,
- blkcg->css.id,
- GFP_NOWAIT | __GFP_NOWARN);
- if (!wb_congested) {
- ret = -ENOMEM;
- goto err_put_css;
- }
-
/* allocate */
if (!new_blkg) {
new_blkg = blkg_alloc(blkcg, q, GFP_NOWAIT | __GFP_NOWARN);
if (unlikely(!new_blkg)) {
ret = -ENOMEM;
- goto err_put_congested;
+ goto err_put_css;
}
}
blkg = new_blkg;
- blkg->wb_congested = wb_congested;
/* link parent */
if (blkcg_parent(blkcg)) {
blkg->parent = __blkg_lookup(blkcg_parent(blkcg), q, false);
if (WARN_ON_ONCE(!blkg->parent)) {
ret = -ENODEV;
- goto err_put_congested;
+ goto err_put_css;
}
blkg_get(blkg->parent);
}
@@ -306,8 +293,6 @@ static struct blkcg_gq *blkg_create(struct blkcg *blkcg,
blkg_put(blkg);
return ERR_PTR(ret);
-err_put_congested:
- wb_congested_put(wb_congested);
err_put_css:
css_put(&blkcg->css);
err_free_blkg:
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index e44473fe0f4873..97838b6d0b5473 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1838,7 +1838,7 @@ static int dm_any_congested(void *congested_data, int bdi_bits)
* top-level queue for congestion.
*/
struct backing_dev_info *bdi = md->queue->backing_dev_info;
- r = bdi->wb.congested->state & bdi_bits;
+ r = bdi->wb.congested & bdi_bits;
} else {
map = dm_get_live_table_fast(md);
if (map)
diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
index cc5aa1f32b91f0..1cec4521e1fbe2 100644
--- a/include/linux/backing-dev-defs.h
+++ b/include/linux/backing-dev-defs.h
@@ -87,26 +87,6 @@ struct wb_completion {
#define DEFINE_WB_COMPLETION(cmpl, bdi) \
struct wb_completion cmpl = WB_COMPLETION_INIT(bdi)
-/*
- * For cgroup writeback, multiple wb's may map to the same blkcg. Those
- * wb's can operate mostly independently but should share the congested
- * state. To facilitate such sharing, the congested state is tracked using
- * the following struct which is created on demand, indexed by blkcg ID on
- * its bdi, and refcounted.
- */
-struct bdi_writeback_congested {
- unsigned long state; /* WB_[a]sync_congested flags */
- refcount_t refcnt; /* nr of attached wb's and blkg */
-
-#ifdef CONFIG_CGROUP_WRITEBACK
- struct backing_dev_info *__bdi; /* the associated bdi, set to NULL
- * on bdi unregistration. For memcg-wb
- * internal use only! */
- int blkcg_id; /* ID of the associated blkcg */
- struct rb_node rb_node; /* on bdi->cgwb_congestion_tree */
-#endif
-};
-
/*
* Each wb (bdi_writeback) can perform writeback operations, is measured
* and throttled, independently. Without cgroup writeback, each bdi
@@ -140,7 +120,7 @@ struct bdi_writeback {
struct percpu_counter stat[NR_WB_STAT_ITEMS];
- struct bdi_writeback_congested *congested;
+ unsigned long congested; /* WB_[a]sync_congested flags */
unsigned long bw_time_stamp; /* last time write bw is updated */
unsigned long dirtied_stamp;
@@ -208,11 +188,8 @@ struct backing_dev_info {
struct list_head wb_list; /* list of all wbs */
#ifdef CONFIG_CGROUP_WRITEBACK
struct radix_tree_root cgwb_tree; /* radix tree of active cgroup wbs */
- struct rb_root cgwb_congested_tree; /* their congested states */
struct mutex cgwb_release_mutex; /* protect shutdown of wb structs */
struct rw_semaphore wb_switch_rwsem; /* no cgwb switch while syncing */
-#else
- struct bdi_writeback_congested *wb_congested;
#endif
wait_queue_head_t wb_waitq;
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 6b3504bf7a42b3..9173d2c22b4aa0 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -173,7 +173,7 @@ static inline int wb_congested(struct bdi_writeback *wb, int cong_bits)
if (bdi->congested_fn)
return bdi->congested_fn(bdi->congested_data, cong_bits);
- return wb->congested->state & cong_bits;
+ return wb->congested & cong_bits;
}
long congestion_wait(int sync, long timeout);
@@ -224,9 +224,6 @@ static inline int bdi_sched_wait(void *word)
#ifdef CONFIG_CGROUP_WRITEBACK
-struct bdi_writeback_congested *
-wb_congested_get_create(struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp);
-void wb_congested_put(struct bdi_writeback_congested *congested);
struct bdi_writeback *wb_get_lookup(struct backing_dev_info *bdi,
struct cgroup_subsys_state *memcg_css);
struct bdi_writeback *wb_get_create(struct backing_dev_info *bdi,
@@ -404,19 +401,6 @@ static inline bool inode_cgwb_enabled(struct inode *inode)
return false;
}
-static inline struct bdi_writeback_congested *
-wb_congested_get_create(struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp)
-{
- refcount_inc(&bdi->wb_congested->refcnt);
- return bdi->wb_congested;
-}
-
-static inline void wb_congested_put(struct bdi_writeback_congested *congested)
-{
- if (refcount_dec_and_test(&congested->refcnt))
- kfree(congested);
-}
-
static inline struct bdi_writeback *wb_find_current(struct backing_dev_info *bdi)
{
return &bdi->wb;
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index 431b2d18bf4074..c8fc9792ac776d 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -109,12 +109,6 @@ struct blkcg_gq {
struct hlist_node blkcg_node;
struct blkcg *blkcg;
- /*
- * Each blkg gets congested separately and the congestion state is
- * propagated to the matching bdi_writeback_congested.
- */
- struct bdi_writeback_congested *wb_congested;
-
/* all non-root blkcg_gq's are guaranteed to have access to parent */
struct blkcg_gq *parent;
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 3ebe5144a102f2..8e8b00627bb2d8 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -281,7 +281,7 @@ void wb_wakeup_delayed(struct bdi_writeback *wb)
#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;
@@ -308,15 +308,9 @@ static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
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);
@@ -330,8 +324,6 @@ static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
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);
@@ -374,7 +366,6 @@ static void wb_exit(struct bdi_writeback *wb)
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);
}
@@ -384,99 +375,12 @@ static void wb_exit(struct bdi_writeback *wb)
#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,
@@ -558,7 +462,7 @@ static int cgwb_create(struct backing_dev_info *bdi,
goto out_put;
}
- ret = wb_init(wb, bdi, blkcg_css->id, gfp);
+ ret = wb_init(wb, bdi, gfp);
if (ret)
goto err_free;
@@ -696,11 +600,10 @@ static int cgwb_bdi_init(struct backing_dev_info *bdi)
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;
@@ -769,21 +672,6 @@ void wb_blkcg_offline(struct blkcg *blkcg)
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);
@@ -810,29 +698,11 @@ subsys_initcall(cgwb_init);
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);
@@ -1023,7 +893,6 @@ static void release_bdi(struct kref *ref)
bdi_unregister(bdi);
WARN_ON_ONCE(bdi->dev);
wb_exit(&bdi->wb);
- cgwb_bdi_exit(bdi);
kfree(bdi);
}
@@ -1053,7 +922,7 @@ void clear_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_clear_bit(bit, &bdi->wb.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))
@@ -1066,7 +935,7 @@ 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, &bdi->wb.congested->state))
+ if (!test_and_set_bit(bit, &bdi->wb.congested))
atomic_inc(&nr_wb_congested[sync]);
}
EXPORT_SYMBOL(set_bdi_congested);
--
2.26.2
Just merge them into their only callers.
Signed-off-by: Christoph Hellwig <[email protected]>
---
include/linux/backing-dev-defs.h | 14 ++------------
mm/backing-dev.c | 12 ++++++------
2 files changed, 8 insertions(+), 18 deletions(-)
diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
index 90a7e844a098f3..cc5aa1f32b91f0 100644
--- a/include/linux/backing-dev-defs.h
+++ b/include/linux/backing-dev-defs.h
@@ -232,18 +232,8 @@ enum {
BLK_RW_SYNC = 1,
};
-void clear_wb_congested(struct bdi_writeback_congested *congested, int sync);
-void set_wb_congested(struct bdi_writeback_congested *congested, int sync);
-
-static inline void clear_bdi_congested(struct backing_dev_info *bdi, int sync)
-{
- clear_wb_congested(bdi->wb.congested, sync);
-}
-
-static inline void set_bdi_congested(struct backing_dev_info *bdi, int sync)
-{
- set_wb_congested(bdi->wb.congested, sync);
-}
+void clear_bdi_congested(struct backing_dev_info *bdi, int sync);
+void set_bdi_congested(struct backing_dev_info *bdi, int sync);
struct wb_lock_cookie {
bool locked;
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index d382272bcc3100..3ebe5144a102f2 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -1047,29 +1047,29 @@ static wait_queue_head_t congestion_wqh[2] = {
};
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->state))
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->state))
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
--
2.26.2
bdi_rw_congested returns congestion state, so calling it without
looking at the return value doesn't make much sense.
Signed-off-by: Christoph Hellwig <[email protected]>
---
drivers/block/drbd/drbd_proc.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/block/drbd/drbd_proc.c b/drivers/block/drbd/drbd_proc.c
index 1c41cd9982a257..3c0193de249830 100644
--- a/drivers/block/drbd/drbd_proc.c
+++ b/drivers/block/drbd/drbd_proc.c
@@ -265,7 +265,6 @@ int drbd_seq_show(struct seq_file *seq, void *v)
seq_printf(seq, "%2d: cs:Unconfigured\n", i);
} else {
/* reset device->congestion_reason */
- bdi_rw_congested(device->rq_queue->backing_dev_info);
nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
wp = nc ? nc->wire_protocol - DRBD_PROT_A + 'A' : ' ';
--
2.26.2
Except for pktdvd, the only places setting congested bits are file
systems that allocate their own backing_dev_info structures. And
pktdvd is a deprecated driver that isn't useful in stack setup
either. So remove the dead congested_fn stacking infrastructure.
Signed-off-by: Christoph Hellwig <[email protected]>
---
drivers/block/drbd/drbd_main.c | 59 --------------------------------
drivers/md/bcache/request.c | 43 -----------------------
drivers/md/bcache/super.c | 1 -
drivers/md/dm-cache-target.c | 19 ----------
drivers/md/dm-clone-target.c | 15 --------
drivers/md/dm-era-target.c | 15 --------
drivers/md/dm-raid.c | 12 -------
drivers/md/dm-table.c | 37 +-------------------
drivers/md/dm-thin.c | 16 ---------
drivers/md/dm.c | 33 ------------------
drivers/md/dm.h | 1 -
drivers/md/md-linear.c | 24 -------------
drivers/md/md-multipath.c | 23 -------------
drivers/md/md.c | 23 -------------
drivers/md/md.h | 4 ---
drivers/md/raid0.c | 16 ---------
drivers/md/raid1.c | 31 -----------------
drivers/md/raid10.c | 26 --------------
drivers/md/raid5.c | 25 --------------
fs/btrfs/disk-io.c | 23 -------------
include/linux/backing-dev-defs.h | 4 ---
include/linux/backing-dev.h | 4 ---
include/linux/device-mapper.h | 11 ------
23 files changed, 1 insertion(+), 464 deletions(-)
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 45fbd526c453bc..e9c9ac3c520282 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2414,62 +2414,6 @@ static void drbd_cleanup(void)
pr_info("module cleanup done.\n");
}
-/**
- * drbd_congested() - Callback for the flusher thread
- * @congested_data: User data
- * @bdi_bits: Bits the BDI flusher thread is currently interested in
- *
- * Returns 1<<WB_async_congested and/or 1<<WB_sync_congested if we are congested.
- */
-static int drbd_congested(void *congested_data, int bdi_bits)
-{
- struct drbd_device *device = congested_data;
- struct request_queue *q;
- char reason = '-';
- int r = 0;
-
- if (!may_inc_ap_bio(device)) {
- /* DRBD has frozen IO */
- r = bdi_bits;
- reason = 'd';
- goto out;
- }
-
- if (test_bit(CALLBACK_PENDING, &first_peer_device(device)->connection->flags)) {
- r |= (1 << WB_async_congested);
- /* Without good local data, we would need to read from remote,
- * and that would need the worker thread as well, which is
- * currently blocked waiting for that usermode helper to
- * finish.
- */
- if (!get_ldev_if_state(device, D_UP_TO_DATE))
- r |= (1 << WB_sync_congested);
- else
- put_ldev(device);
- r &= bdi_bits;
- reason = 'c';
- goto out;
- }
-
- if (get_ldev(device)) {
- q = bdev_get_queue(device->ldev->backing_bdev);
- r = bdi_congested(q->backing_dev_info, bdi_bits);
- put_ldev(device);
- if (r)
- reason = 'b';
- }
-
- if (bdi_bits & (1 << WB_async_congested) &&
- test_bit(NET_CONGESTED, &first_peer_device(device)->connection->flags)) {
- r |= (1 << WB_async_congested);
- reason = reason == 'b' ? 'a' : 'n';
- }
-
-out:
- device->congestion_reason = reason;
- return r;
-}
-
static void drbd_init_workqueue(struct drbd_work_queue* wq)
{
spin_lock_init(&wq->q_lock);
@@ -2825,9 +2769,6 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig
/* we have no partitions. we contain only ourselves. */
device->this_bdev->bd_contains = device->this_bdev;
- q->backing_dev_info->congested_fn = drbd_congested;
- q->backing_dev_info->congested_data = device;
-
blk_queue_write_cache(q, true, true);
/* Setting the max_hw_sectors to an odd value of 8kibyte here
This triggers a max_bio_size message upon first attach or connect */
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 7acf024e99f351..cda05fc61c3afa 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -1228,36 +1228,10 @@ static int cached_dev_ioctl(struct bcache_device *d, fmode_t mode,
return __blkdev_driver_ioctl(dc->bdev, mode, cmd, arg);
}
-static int cached_dev_congested(void *data, int bits)
-{
- struct bcache_device *d = data;
- struct cached_dev *dc = container_of(d, struct cached_dev, disk);
- struct request_queue *q = bdev_get_queue(dc->bdev);
- int ret = 0;
-
- if (bdi_congested(q->backing_dev_info, bits))
- return 1;
-
- if (cached_dev_get(dc)) {
- unsigned int i;
- struct cache *ca;
-
- for_each_cache(ca, d->c, i) {
- q = bdev_get_queue(ca->bdev);
- ret |= bdi_congested(q->backing_dev_info, bits);
- }
-
- cached_dev_put(dc);
- }
-
- return ret;
-}
-
void bch_cached_dev_request_init(struct cached_dev *dc)
{
struct gendisk *g = dc->disk.disk;
- g->queue->backing_dev_info->congested_fn = cached_dev_congested;
dc->disk.cache_miss = cached_dev_cache_miss;
dc->disk.ioctl = cached_dev_ioctl;
}
@@ -1342,27 +1316,10 @@ static int flash_dev_ioctl(struct bcache_device *d, fmode_t mode,
return -ENOTTY;
}
-static int flash_dev_congested(void *data, int bits)
-{
- struct bcache_device *d = data;
- struct request_queue *q;
- struct cache *ca;
- unsigned int i;
- int ret = 0;
-
- for_each_cache(ca, d->c, i) {
- q = bdev_get_queue(ca->bdev);
- ret |= bdi_congested(q->backing_dev_info, bits);
- }
-
- return ret;
-}
-
void bch_flash_dev_request_init(struct bcache_device *d)
{
struct gendisk *g = d->disk;
- g->queue->backing_dev_info->congested_fn = flash_dev_congested;
d->cache_miss = flash_dev_cache_miss;
d->ioctl = flash_dev_ioctl;
}
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 2014016f9a60d3..1810d7ca2f6653 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -877,7 +877,6 @@ static int bcache_device_init(struct bcache_device *d, unsigned int block_size,
d->disk->queue = q;
q->queuedata = d;
- q->backing_dev_info->congested_data = d;
q->limits.max_hw_sectors = UINT_MAX;
q->limits.max_sectors = UINT_MAX;
q->limits.max_segment_size = UINT_MAX;
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index d3bb355819a421..24549dc92eeec5 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -421,8 +421,6 @@ struct cache {
struct rw_semaphore quiesce_lock;
- struct dm_target_callbacks callbacks;
-
/*
* origin_blocks entries, discarded if set.
*/
@@ -2423,20 +2421,6 @@ static void set_cache_size(struct cache *cache, dm_cblock_t size)
cache->cache_size = size;
}
-static int is_congested(struct dm_dev *dev, int bdi_bits)
-{
- struct request_queue *q = bdev_get_queue(dev->bdev);
- return bdi_congested(q->backing_dev_info, bdi_bits);
-}
-
-static int cache_is_congested(struct dm_target_callbacks *cb, int bdi_bits)
-{
- struct cache *cache = container_of(cb, struct cache, callbacks);
-
- return is_congested(cache->origin_dev, bdi_bits) ||
- is_congested(cache->cache_dev, bdi_bits);
-}
-
#define DEFAULT_MIGRATION_THRESHOLD 2048
static int cache_create(struct cache_args *ca, struct cache **result)
@@ -2471,9 +2455,6 @@ static int cache_create(struct cache_args *ca, struct cache **result)
goto bad;
}
- cache->callbacks.congested_fn = cache_is_congested;
- dm_table_add_target_callbacks(ti->table, &cache->callbacks);
-
cache->metadata_dev = ca->metadata_dev;
cache->origin_dev = ca->origin_dev;
cache->cache_dev = ca->cache_dev;
diff --git a/drivers/md/dm-clone-target.c b/drivers/md/dm-clone-target.c
index 5ce96ddf1ce1eb..8e900418d571ff 100644
--- a/drivers/md/dm-clone-target.c
+++ b/drivers/md/dm-clone-target.c
@@ -68,7 +68,6 @@ struct hash_table_bucket;
struct clone {
struct dm_target *ti;
- struct dm_target_callbacks callbacks;
struct dm_dev *metadata_dev;
struct dm_dev *dest_dev;
@@ -1518,18 +1517,6 @@ static void clone_status(struct dm_target *ti, status_type_t type,
DMEMIT("Error");
}
-static int clone_is_congested(struct dm_target_callbacks *cb, int bdi_bits)
-{
- struct request_queue *dest_q, *source_q;
- struct clone *clone = container_of(cb, struct clone, callbacks);
-
- source_q = bdev_get_queue(clone->source_dev->bdev);
- dest_q = bdev_get_queue(clone->dest_dev->bdev);
-
- return (bdi_congested(dest_q->backing_dev_info, bdi_bits) |
- bdi_congested(source_q->backing_dev_info, bdi_bits));
-}
-
static sector_t get_dev_size(struct dm_dev *dev)
{
return i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT;
@@ -1930,8 +1917,6 @@ static int clone_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto out_with_mempool;
mutex_init(&clone->commit_lock);
- clone->callbacks.congested_fn = clone_is_congested;
- dm_table_add_target_callbacks(ti->table, &clone->callbacks);
/* Enable flushes */
ti->num_flush_bios = 1;
diff --git a/drivers/md/dm-era-target.c b/drivers/md/dm-era-target.c
index bdb84b8e71621d..e8d3b5abc85bd6 100644
--- a/drivers/md/dm-era-target.c
+++ b/drivers/md/dm-era-target.c
@@ -1137,7 +1137,6 @@ static int metadata_get_stats(struct era_metadata *md, void *ptr)
struct era {
struct dm_target *ti;
- struct dm_target_callbacks callbacks;
struct dm_dev *metadata_dev;
struct dm_dev *origin_dev;
@@ -1375,18 +1374,6 @@ static void stop_worker(struct era *era)
/*----------------------------------------------------------------
* Target methods
*--------------------------------------------------------------*/
-static int dev_is_congested(struct dm_dev *dev, int bdi_bits)
-{
- struct request_queue *q = bdev_get_queue(dev->bdev);
- return bdi_congested(q->backing_dev_info, bdi_bits);
-}
-
-static int era_is_congested(struct dm_target_callbacks *cb, int bdi_bits)
-{
- struct era *era = container_of(cb, struct era, callbacks);
- return dev_is_congested(era->origin_dev, bdi_bits);
-}
-
static void era_destroy(struct era *era)
{
if (era->md)
@@ -1514,8 +1501,6 @@ static int era_ctr(struct dm_target *ti, unsigned argc, char **argv)
ti->flush_supported = true;
ti->num_discard_bios = 1;
- era->callbacks.congested_fn = era_is_congested;
- dm_table_add_target_callbacks(ti->table, &era->callbacks);
return 0;
}
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 10e8b2fe787b56..d9e270957e1840 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -242,7 +242,6 @@ struct raid_set {
struct mddev md;
struct raid_type *raid_type;
- struct dm_target_callbacks callbacks;
sector_t array_sectors;
sector_t dev_sectors;
@@ -1705,13 +1704,6 @@ static void do_table_event(struct work_struct *ws)
dm_table_event(rs->ti->table);
}
-static int raid_is_congested(struct dm_target_callbacks *cb, int bits)
-{
- struct raid_set *rs = container_of(cb, struct raid_set, callbacks);
-
- return mddev_congested(&rs->md, bits);
-}
-
/*
* Make sure a valid takover (level switch) is being requested on @rs
*
@@ -3248,9 +3240,6 @@ static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto bad_md_start;
}
- rs->callbacks.congested_fn = raid_is_congested;
- dm_table_add_target_callbacks(ti->table, &rs->callbacks);
-
/* If raid4/5/6 journal mode explicitly requested (only possible with journal dev) -> set it */
if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) {
r = r5c_journal_mode_set(&rs->md, rs->journal_dev.mode);
@@ -3310,7 +3299,6 @@ static void raid_dtr(struct dm_target *ti)
{
struct raid_set *rs = ti->private;
- list_del_init(&rs->callbacks.list);
md_stop(&rs->md);
raid_set_free(rs);
}
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 8277b959e00bd6..0ea5b7367179ff 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -64,8 +64,6 @@ struct dm_table {
void *event_context;
struct dm_md_mempools *mempools;
-
- struct list_head target_callbacks;
};
/*
@@ -190,7 +188,6 @@ int dm_table_create(struct dm_table **result, fmode_t mode,
return -ENOMEM;
INIT_LIST_HEAD(&t->devices);
- INIT_LIST_HEAD(&t->target_callbacks);
if (!num_targets)
num_targets = KEYS_PER_NODE;
@@ -361,7 +358,7 @@ static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev,
* This upgrades the mode on an already open dm_dev, being
* careful to leave things as they were if we fail to reopen the
* device and not to touch the existing bdev field in case
- * it is accessed concurrently inside dm_table_any_congested().
+ * it is accessed concurrently.
*/
static int upgrade_mode(struct dm_dev_internal *dd, fmode_t new_mode,
struct mapped_device *md)
@@ -2052,38 +2049,6 @@ int dm_table_resume_targets(struct dm_table *t)
return 0;
}
-void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callbacks *cb)
-{
- list_add(&cb->list, &t->target_callbacks);
-}
-EXPORT_SYMBOL_GPL(dm_table_add_target_callbacks);
-
-int dm_table_any_congested(struct dm_table *t, int bdi_bits)
-{
- struct dm_dev_internal *dd;
- struct list_head *devices = dm_table_get_devices(t);
- struct dm_target_callbacks *cb;
- int r = 0;
-
- list_for_each_entry(dd, devices, list) {
- struct request_queue *q = bdev_get_queue(dd->dm_dev->bdev);
- char b[BDEVNAME_SIZE];
-
- if (likely(q))
- r |= bdi_congested(q->backing_dev_info, bdi_bits);
- else
- DMWARN_LIMIT("%s: any_congested: nonexistent device %s",
- dm_device_name(t->md),
- bdevname(dd->dm_dev->bdev, b));
- }
-
- list_for_each_entry(cb, &t->target_callbacks, list)
- if (cb->congested_fn)
- r |= cb->congested_fn(cb, bdi_bits);
-
- return r;
-}
-
struct mapped_device *dm_table_get_md(struct dm_table *t)
{
return t->md;
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index fa8d5464c1fb51..e95682e09d5af8 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -326,7 +326,6 @@ struct pool_c {
struct pool *pool;
struct dm_dev *data_dev;
struct dm_dev *metadata_dev;
- struct dm_target_callbacks callbacks;
dm_block_t low_water_blocks;
struct pool_features requested_pf; /* Features requested during table load */
@@ -2796,18 +2795,6 @@ static int thin_bio_map(struct dm_target *ti, struct bio *bio)
}
}
-static int pool_is_congested(struct dm_target_callbacks *cb, int bdi_bits)
-{
- struct pool_c *pt = container_of(cb, struct pool_c, callbacks);
- struct request_queue *q;
-
- if (get_pool_mode(pt->pool) == PM_OUT_OF_DATA_SPACE)
- return 1;
-
- q = bdev_get_queue(pt->data_dev->bdev);
- return bdi_congested(q->backing_dev_info, bdi_bits);
-}
-
static void requeue_bios(struct pool *pool)
{
struct thin_c *tc;
@@ -3420,9 +3407,6 @@ static int pool_ctr(struct dm_target *ti, unsigned argc, char **argv)
dm_pool_register_pre_commit_callback(pool->pmd,
metadata_pre_commit_callback, pool);
- pt->callbacks.congested_fn = pool_is_congested;
- dm_table_add_target_callbacks(ti->table, &pt->callbacks);
-
mutex_unlock(&dm_thin_pool_table.mutex);
return 0;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 97838b6d0b5473..f0fd8822da514f 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1825,31 +1825,6 @@ static blk_qc_t dm_make_request(struct request_queue *q, struct bio *bio)
return ret;
}
-static int dm_any_congested(void *congested_data, int bdi_bits)
-{
- int r = bdi_bits;
- struct mapped_device *md = congested_data;
- struct dm_table *map;
-
- if (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) {
- if (dm_request_based(md)) {
- /*
- * With request-based DM we only need to check the
- * top-level queue for congestion.
- */
- struct backing_dev_info *bdi = md->queue->backing_dev_info;
- r = bdi->wb.congested & bdi_bits;
- } else {
- map = dm_get_live_table_fast(md);
- if (map)
- r = dm_table_any_congested(map, bdi_bits);
- dm_put_live_table_fast(md);
- }
- }
-
- return r;
-}
-
/*-----------------------------------------------------------------
* An IDR is used to keep track of allocated minor numbers.
*---------------------------------------------------------------*/
@@ -2289,12 +2264,6 @@ struct queue_limits *dm_get_queue_limits(struct mapped_device *md)
}
EXPORT_SYMBOL_GPL(dm_get_queue_limits);
-static void dm_init_congested_fn(struct mapped_device *md)
-{
- md->queue->backing_dev_info->congested_data = md;
- md->queue->backing_dev_info->congested_fn = dm_any_congested;
-}
-
/*
* Setup the DM device's queue based on md's type
*/
@@ -2311,12 +2280,10 @@ int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
DMERR("Cannot initialize queue for request-based dm-mq mapped device");
return r;
}
- dm_init_congested_fn(md);
break;
case DM_TYPE_BIO_BASED:
case DM_TYPE_DAX_BIO_BASED:
case DM_TYPE_NVME_BIO_BASED:
- dm_init_congested_fn(md);
break;
case DM_TYPE_NONE:
WARN_ON_ONCE(true);
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index d7c4f6606b5fca..4f5fe664d05ac7 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -63,7 +63,6 @@ void dm_table_presuspend_targets(struct dm_table *t);
void dm_table_presuspend_undo_targets(struct dm_table *t);
void dm_table_postsuspend_targets(struct dm_table *t);
int dm_table_resume_targets(struct dm_table *t);
-int dm_table_any_congested(struct dm_table *t, int bdi_bits);
enum dm_queue_mode dm_table_get_type(struct dm_table *t);
struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
diff --git a/drivers/md/md-linear.c b/drivers/md/md-linear.c
index 26c75c0199fa1b..e19d1919a753d2 100644
--- a/drivers/md/md-linear.c
+++ b/drivers/md/md-linear.c
@@ -46,29 +46,6 @@ static inline struct dev_info *which_dev(struct mddev *mddev, sector_t sector)
return conf->disks + lo;
}
-/*
- * In linear_congested() conf->raid_disks is used as a copy of
- * mddev->raid_disks to iterate conf->disks[], because conf->raid_disks
- * and conf->disks[] are created in linear_conf(), they are always
- * consitent with each other, but mddev->raid_disks does not.
- */
-static int linear_congested(struct mddev *mddev, int bits)
-{
- struct linear_conf *conf;
- int i, ret = 0;
-
- rcu_read_lock();
- conf = rcu_dereference(mddev->private);
-
- for (i = 0; i < conf->raid_disks && !ret ; i++) {
- struct request_queue *q = bdev_get_queue(conf->disks[i].rdev->bdev);
- ret |= bdi_congested(q->backing_dev_info, bits);
- }
-
- rcu_read_unlock();
- return ret;
-}
-
static sector_t linear_size(struct mddev *mddev, sector_t sectors, int raid_disks)
{
struct linear_conf *conf;
@@ -322,7 +299,6 @@ static struct md_personality linear_personality =
.hot_add_disk = linear_add,
.size = linear_size,
.quiesce = linear_quiesce,
- .congested = linear_congested,
};
static int __init linear_init (void)
diff --git a/drivers/md/md-multipath.c b/drivers/md/md-multipath.c
index 152f9e65a22665..f9c895fa9afc25 100644
--- a/drivers/md/md-multipath.c
+++ b/drivers/md/md-multipath.c
@@ -151,28 +151,6 @@ static void multipath_status(struct seq_file *seq, struct mddev *mddev)
seq_putc(seq, ']');
}
-static int multipath_congested(struct mddev *mddev, int bits)
-{
- struct mpconf *conf = mddev->private;
- int i, ret = 0;
-
- rcu_read_lock();
- for (i = 0; i < mddev->raid_disks ; i++) {
- struct md_rdev *rdev = rcu_dereference(conf->multipaths[i].rdev);
- if (rdev && !test_bit(Faulty, &rdev->flags)) {
- struct request_queue *q = bdev_get_queue(rdev->bdev);
-
- ret |= bdi_congested(q->backing_dev_info, bits);
- /* Just like multipath_map, we just check the
- * first available device
- */
- break;
- }
- }
- rcu_read_unlock();
- return ret;
-}
-
/*
* Careful, this can execute in IRQ contexts as well!
*/
@@ -478,7 +456,6 @@ static struct md_personality multipath_personality =
.hot_add_disk = multipath_add_disk,
.hot_remove_disk= multipath_remove_disk,
.size = multipath_size,
- .congested = multipath_congested,
};
static int __init multipath_init (void)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index f567f536b529bd..b27038246bc563 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -549,26 +549,6 @@ void mddev_resume(struct mddev *mddev)
}
EXPORT_SYMBOL_GPL(mddev_resume);
-int mddev_congested(struct mddev *mddev, int bits)
-{
- struct md_personality *pers = mddev->pers;
- int ret = 0;
-
- rcu_read_lock();
- if (mddev->suspended)
- ret = 1;
- else if (pers && pers->congested)
- ret = pers->congested(mddev, bits);
- rcu_read_unlock();
- return ret;
-}
-EXPORT_SYMBOL_GPL(mddev_congested);
-static int md_congested(void *data, int bits)
-{
- struct mddev *mddev = data;
- return mddev_congested(mddev, bits);
-}
-
/*
* Generic flush handling for md
*/
@@ -5964,8 +5944,6 @@ int md_run(struct mddev *mddev)
blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
else
blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
- mddev->queue->backing_dev_info->congested_data = mddev;
- mddev->queue->backing_dev_info->congested_fn = md_congested;
}
if (pers->sync_request) {
if (mddev->kobj.sd &&
@@ -6350,7 +6328,6 @@ static int do_md_stop(struct mddev *mddev, int mode,
__md_stop_writes(mddev);
__md_stop(mddev);
- mddev->queue->backing_dev_info->congested_fn = NULL;
/* tell userspace to handle 'inactive' */
sysfs_notify_dirent_safe(mddev->sysfs_state);
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 612814d07d35ab..e2f1ad9afc4885 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -597,9 +597,6 @@ struct md_personality
* array.
*/
void *(*takeover) (struct mddev *mddev);
- /* congested implements bdi.congested_fn().
- * Will not be called while array is 'suspended' */
- int (*congested)(struct mddev *mddev, int bits);
/* Changes the consistency policy of an active array. */
int (*change_consistency_policy)(struct mddev *mddev, const char *buf);
};
@@ -710,7 +707,6 @@ extern void md_done_sync(struct mddev *mddev, int blocks, int ok);
extern void md_error(struct mddev *mddev, struct md_rdev *rdev);
extern void md_finish_reshape(struct mddev *mddev);
-extern int mddev_congested(struct mddev *mddev, int bits);
extern bool __must_check md_flush_request(struct mddev *mddev, struct bio *bio);
extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
sector_t sector, int size, struct page *page);
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 322386ff5d225d..d092b88af80a66 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -29,21 +29,6 @@ module_param(default_layout, int, 0644);
(1L << MD_HAS_PPL) | \
(1L << MD_HAS_MULTIPLE_PPLS))
-static int raid0_congested(struct mddev *mddev, int bits)
-{
- struct r0conf *conf = mddev->private;
- struct md_rdev **devlist = conf->devlist;
- int raid_disks = conf->strip_zone[0].nb_dev;
- int i, ret = 0;
-
- for (i = 0; i < raid_disks && !ret ; i++) {
- struct request_queue *q = bdev_get_queue(devlist[i]->bdev);
-
- ret |= bdi_congested(q->backing_dev_info, bits);
- }
- return ret;
-}
-
/*
* inform the user of the raid configuration
*/
@@ -818,7 +803,6 @@ static struct md_personality raid0_personality=
.size = raid0_size,
.takeover = raid0_takeover,
.quiesce = raid0_quiesce,
- .congested = raid0_congested,
};
static int __init raid0_init (void)
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index dcd27f3da84eca..4edc7ff05ed278 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -786,36 +786,6 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
return best_disk;
}
-static int raid1_congested(struct mddev *mddev, int bits)
-{
- struct r1conf *conf = mddev->private;
- int i, ret = 0;
-
- if ((bits & (1 << WB_async_congested)) &&
- conf->pending_count >= max_queued_requests)
- return 1;
-
- rcu_read_lock();
- for (i = 0; i < conf->raid_disks * 2; i++) {
- struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev);
- if (rdev && !test_bit(Faulty, &rdev->flags)) {
- struct request_queue *q = bdev_get_queue(rdev->bdev);
-
- BUG_ON(!q);
-
- /* Note the '|| 1' - when read_balance prefers
- * non-congested targets, it can be removed
- */
- if ((bits & (1 << WB_async_congested)) || 1)
- ret |= bdi_congested(q->backing_dev_info, bits);
- else
- ret &= bdi_congested(q->backing_dev_info, bits);
- }
- }
- rcu_read_unlock();
- return ret;
-}
-
static void flush_bio_list(struct r1conf *conf, struct bio *bio)
{
/* flush any pending bitmap writes to disk before proceeding w/ I/O */
@@ -3396,7 +3366,6 @@ static struct md_personality raid1_personality =
.check_reshape = raid1_reshape,
.quiesce = raid1_quiesce,
.takeover = raid1_takeover,
- .congested = raid1_congested,
};
static int __init raid_init(void)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index ec136e44aef7f8..1768300138b35f 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -848,31 +848,6 @@ static struct md_rdev *read_balance(struct r10conf *conf,
return rdev;
}
-static int raid10_congested(struct mddev *mddev, int bits)
-{
- struct r10conf *conf = mddev->private;
- int i, ret = 0;
-
- if ((bits & (1 << WB_async_congested)) &&
- conf->pending_count >= max_queued_requests)
- return 1;
-
- rcu_read_lock();
- for (i = 0;
- (i < conf->geo.raid_disks || i < conf->prev.raid_disks)
- && ret == 0;
- i++) {
- struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev);
- if (rdev && !test_bit(Faulty, &rdev->flags)) {
- struct request_queue *q = bdev_get_queue(rdev->bdev);
-
- ret |= bdi_congested(q->backing_dev_info, bits);
- }
- }
- rcu_read_unlock();
- return ret;
-}
-
static void flush_pending_writes(struct r10conf *conf)
{
/* Any writes that have been queued but are awaiting
@@ -4929,7 +4904,6 @@ static struct md_personality raid10_personality =
.start_reshape = raid10_start_reshape,
.finish_reshape = raid10_finish_reshape,
.update_reshape_pos = raid10_update_reshape_pos,
- .congested = raid10_congested,
};
static int __init raid_init(void)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index ab8067f9ce8c68..229a36a8694f28 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5099,28 +5099,6 @@ static void activate_bit_delay(struct r5conf *conf,
}
}
-static int raid5_congested(struct mddev *mddev, int bits)
-{
- struct r5conf *conf = mddev->private;
-
- /* No difference between reads and writes. Just check
- * how busy the stripe_cache is
- */
-
- if (test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state))
- return 1;
-
- /* Also checks whether there is pressure on r5cache log space */
- if (test_bit(R5C_LOG_TIGHT, &conf->cache_state))
- return 1;
- if (conf->quiesce)
- return 1;
- if (atomic_read(&conf->empty_inactive_list_nr))
- return 1;
-
- return 0;
-}
-
static int in_chunk_boundary(struct mddev *mddev, struct bio *bio)
{
struct r5conf *conf = mddev->private;
@@ -8427,7 +8405,6 @@ static struct md_personality raid6_personality =
.finish_reshape = raid5_finish_reshape,
.quiesce = raid5_quiesce,
.takeover = raid6_takeover,
- .congested = raid5_congested,
.change_consistency_policy = raid5_change_consistency_policy,
};
static struct md_personality raid5_personality =
@@ -8452,7 +8429,6 @@ static struct md_personality raid5_personality =
.finish_reshape = raid5_finish_reshape,
.quiesce = raid5_quiesce,
.takeover = raid5_takeover,
- .congested = raid5_congested,
.change_consistency_policy = raid5_change_consistency_policy,
};
@@ -8478,7 +8454,6 @@ static struct md_personality raid4_personality =
.finish_reshape = raid5_finish_reshape,
.quiesce = raid5_quiesce,
.takeover = raid4_takeover,
- .congested = raid5_congested,
.change_consistency_policy = raid5_change_consistency_policy,
};
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 7c6f0bbb54a5bd..eb5f2506cede72 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1616,27 +1616,6 @@ struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
return ERR_PTR(ret);
}
-static int btrfs_congested_fn(void *congested_data, int bdi_bits)
-{
- struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
- int ret = 0;
- struct btrfs_device *device;
- struct backing_dev_info *bdi;
-
- rcu_read_lock();
- list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) {
- if (!device->bdev)
- continue;
- bdi = device->bdev->bd_bdi;
- if (bdi_congested(bdi, bdi_bits)) {
- ret = 1;
- break;
- }
- }
- rcu_read_unlock();
- return ret;
-}
-
/*
* called by the kthread helper functions to finally call the bio end_io
* functions. This is where read checksum verification actually happens
@@ -3051,8 +3030,6 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
goto fail_sb_buffer;
}
- sb->s_bdi->congested_fn = btrfs_congested_fn;
- sb->s_bdi->congested_data = fs_info;
sb->s_bdi->capabilities |= BDI_CAP_CGROUP_WRITEBACK;
sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super);
diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
index 1cec4521e1fbe2..fff9367a634856 100644
--- a/include/linux/backing-dev-defs.h
+++ b/include/linux/backing-dev-defs.h
@@ -33,8 +33,6 @@ enum wb_congested_state {
WB_sync_congested, /* The sync queue is getting full */
};
-typedef int (congested_fn)(void *, int);
-
enum wb_stat_item {
WB_RECLAIMABLE,
WB_WRITEBACK,
@@ -170,8 +168,6 @@ struct backing_dev_info {
struct list_head bdi_list;
unsigned long ra_pages; /* max readahead in PAGE_SIZE units */
unsigned long io_pages; /* max allowed IO size */
- congested_fn *congested_fn; /* Function pointer if device is md/dm */
- void *congested_data; /* Pointer to aux data for congested func */
struct kref refcnt; /* Reference counter for the structure */
unsigned int capabilities; /* Device capabilities */
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 9173d2c22b4aa0..0b06b2d26c9aa3 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -169,10 +169,6 @@ static inline struct backing_dev_info *inode_to_bdi(struct inode *inode)
static inline int wb_congested(struct bdi_writeback *wb, int cong_bits)
{
- struct backing_dev_info *bdi = wb->bdi;
-
- if (bdi->congested_fn)
- return bdi->congested_fn(bdi->congested_data, cong_bits);
return wb->congested & cong_bits;
}
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 8750f2dc5613ab..d5306d9c29c4f2 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -322,12 +322,6 @@ struct dm_target {
bool discards_supported:1;
};
-/* Each target can link one of these into the table */
-struct dm_target_callbacks {
- struct list_head list;
- int (*congested_fn) (struct dm_target_callbacks *, int);
-};
-
void *dm_per_bio_data(struct bio *bio, size_t data_size);
struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size);
unsigned dm_bio_get_target_bio_nr(const struct bio *bio);
@@ -477,11 +471,6 @@ int dm_table_create(struct dm_table **result, fmode_t mode,
int dm_table_add_target(struct dm_table *t, const char *type,
sector_t start, sector_t len, char *params);
-/*
- * Target_ctr should call this if it needs to add any callbacks.
- */
-void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callbacks *cb);
-
/*
* Target can use this to set the table's type.
* Can only ever be called from a target's ctr.
--
2.26.2
On Wed, Jul 01, 2020 at 11:06:22AM +0200, Christoph Hellwig wrote:
> Except for pktdvd, the only places setting congested bits are file
> systems that allocate their own backing_dev_info structures. And
> pktdvd is a deprecated driver that isn't useful in stack setup
> either. So remove the dead congested_fn stacking infrastructure.
>
> Signed-off-by: Christoph Hellwig <[email protected]>
> ---
> drivers/block/drbd/drbd_main.c | 59 --------------------------------
> drivers/md/bcache/request.c | 43 -----------------------
> drivers/md/bcache/super.c | 1 -
> drivers/md/dm-cache-target.c | 19 ----------
> drivers/md/dm-clone-target.c | 15 --------
> drivers/md/dm-era-target.c | 15 --------
> drivers/md/dm-raid.c | 12 -------
> drivers/md/dm-table.c | 37 +-------------------
> drivers/md/dm-thin.c | 16 ---------
> drivers/md/dm.c | 33 ------------------
> drivers/md/dm.h | 1 -
> drivers/md/md-linear.c | 24 -------------
> drivers/md/md-multipath.c | 23 -------------
> drivers/md/md.c | 23 -------------
> drivers/md/md.h | 4 ---
> drivers/md/raid0.c | 16 ---------
> drivers/md/raid1.c | 31 -----------------
> drivers/md/raid10.c | 26 --------------
> drivers/md/raid5.c | 25 --------------
For the btrfs bits
> fs/btrfs/disk-io.c | 23 -------------
Acked-by: David Sterba <[email protected]>
On Wed, Jul 01, 2020 at 11:06:18AM +0200, Christoph Hellwig wrote:
> Hi Jens,
>
> we have a lot of bdi congestion related code that is left around without
> any use. This series removes it in preparation of sorting out the bdi
> lifetime rules properly.
Acked-by: Tejun Heo <[email protected]>
Thanks a lot for killing the dead code.
--
tejun
On Wed, Jul 01 2020 at 5:06am -0400,
Christoph Hellwig <[email protected]> wrote:
> Hi Jens,
>
> we have a lot of bdi congestion related code that is left around without
> any use. This series removes it in preparation of sorting out the bdi
> lifetime rules properly.
I could do some git archeology to see what the fs, mm and block core
changes were to stop using bdi congested but a pointer to associated
changes (or quick recap) would save me some time.
Also, curious to know how back-pressure should be felt back up the IO
stack now? (apologies if these are well worn topics, I haven't been
tracking this area of development).
Thanks,
Mike
On Wed, Jul 01, 2020 at 12:41:03PM -0400, Mike Snitzer wrote:
> On Wed, Jul 01 2020 at 5:06am -0400,
> Christoph Hellwig <[email protected]> wrote:
>
> > Hi Jens,
> >
> > we have a lot of bdi congestion related code that is left around without
> > any use. This series removes it in preparation of sorting out the bdi
> > lifetime rules properly.
>
> I could do some git archeology to see what the fs, mm and block core
> changes were to stop using bdi congested but a pointer to associated
> changes (or quick recap) would save me some time.
>
> Also, curious to know how back-pressure should be felt back up the IO
> stack now? (apologies if these are well worn topics, I haven't been
> tracking this area of development).
It isn't. Jens declared the implementation was broken, and broke it
more. So we're just living with stupid broken timeouts.
On Wed, Jul 01, 2020 at 06:57:47PM +0100, Matthew Wilcox wrote:
> On Wed, Jul 01, 2020 at 12:41:03PM -0400, Mike Snitzer wrote:
> > On Wed, Jul 01 2020 at 5:06am -0400,
> > Christoph Hellwig <[email protected]> wrote:
> >
> > > Hi Jens,
> > >
> > > we have a lot of bdi congestion related code that is left around without
> > > any use. This series removes it in preparation of sorting out the bdi
> > > lifetime rules properly.
> >
> > I could do some git archeology to see what the fs, mm and block core
> > changes were to stop using bdi congested but a pointer to associated
> > changes (or quick recap) would save me some time.
> >
> > Also, curious to know how back-pressure should be felt back up the IO
> > stack now? (apologies if these are well worn topics, I haven't been
> > tracking this area of development).
>
> It isn't. Jens declared the implementation was broken, and broke it
> more. So we're just living with stupid broken timeouts.
Here's a thread about it. This would have been a discussion topic at
LSFMM2020, but COVID.
https://lore.kernel.org/linux-mm/[email protected]/T/#u
On 2020/7/1 17:06, Christoph Hellwig wrote:
> Except for pktdvd, the only places setting congested bits are file
> systems that allocate their own backing_dev_info structures. And
> pktdvd is a deprecated driver that isn't useful in stack setup
> either. So remove the dead congested_fn stacking infrastructure.
>
> Signed-off-by: Christoph Hellwig <[email protected]>
For the bcache part, Acked-by: Coly Li <[email protected]>
Thanks.
Coly Li
> ---
> drivers/block/drbd/drbd_main.c | 59 --------------------------------
> drivers/md/bcache/request.c | 43 -----------------------
> drivers/md/bcache/super.c | 1 -
> drivers/md/dm-cache-target.c | 19 ----------
> drivers/md/dm-clone-target.c | 15 --------
> drivers/md/dm-era-target.c | 15 --------
> drivers/md/dm-raid.c | 12 -------
> drivers/md/dm-table.c | 37 +-------------------
> drivers/md/dm-thin.c | 16 ---------
> drivers/md/dm.c | 33 ------------------
> drivers/md/dm.h | 1 -
> drivers/md/md-linear.c | 24 -------------
> drivers/md/md-multipath.c | 23 -------------
> drivers/md/md.c | 23 -------------
> drivers/md/md.h | 4 ---
> drivers/md/raid0.c | 16 ---------
> drivers/md/raid1.c | 31 -----------------
> drivers/md/raid10.c | 26 --------------
> drivers/md/raid5.c | 25 --------------
> fs/btrfs/disk-io.c | 23 -------------
> include/linux/backing-dev-defs.h | 4 ---
> include/linux/backing-dev.h | 4 ---
> include/linux/device-mapper.h | 11 ------
> 23 files changed, 1 insertion(+), 464 deletions(-)
>
[snipped]
> diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
> index 7acf024e99f351..cda05fc61c3afa 100644
> --- a/drivers/md/bcache/request.c
> +++ b/drivers/md/bcache/request.c
> @@ -1228,36 +1228,10 @@ static int cached_dev_ioctl(struct bcache_device *d, fmode_t mode,
> return __blkdev_driver_ioctl(dc->bdev, mode, cmd, arg);
> }
>
> -static int cached_dev_congested(void *data, int bits)
> -{
> - struct bcache_device *d = data;
> - struct cached_dev *dc = container_of(d, struct cached_dev, disk);
> - struct request_queue *q = bdev_get_queue(dc->bdev);
> - int ret = 0;
> -
> - if (bdi_congested(q->backing_dev_info, bits))
> - return 1;
> -
> - if (cached_dev_get(dc)) {
> - unsigned int i;
> - struct cache *ca;
> -
> - for_each_cache(ca, d->c, i) {
> - q = bdev_get_queue(ca->bdev);
> - ret |= bdi_congested(q->backing_dev_info, bits);
> - }
> -
> - cached_dev_put(dc);
> - }
> -
> - return ret;
> -}
> -
> void bch_cached_dev_request_init(struct cached_dev *dc)
> {
> struct gendisk *g = dc->disk.disk;
>
> - g->queue->backing_dev_info->congested_fn = cached_dev_congested;
> dc->disk.cache_miss = cached_dev_cache_miss;
> dc->disk.ioctl = cached_dev_ioctl;
> }
> @@ -1342,27 +1316,10 @@ static int flash_dev_ioctl(struct bcache_device *d, fmode_t mode,
> return -ENOTTY;
> }
>
> -static int flash_dev_congested(void *data, int bits)
> -{
> - struct bcache_device *d = data;
> - struct request_queue *q;
> - struct cache *ca;
> - unsigned int i;
> - int ret = 0;
> -
> - for_each_cache(ca, d->c, i) {
> - q = bdev_get_queue(ca->bdev);
> - ret |= bdi_congested(q->backing_dev_info, bits);
> - }
> -
> - return ret;
> -}
> -
> void bch_flash_dev_request_init(struct bcache_device *d)
> {
> struct gendisk *g = d->disk;
>
> - g->queue->backing_dev_info->congested_fn = flash_dev_congested;
> d->cache_miss = flash_dev_cache_miss;
> d->ioctl = flash_dev_ioctl;
> }
> diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
> index 2014016f9a60d3..1810d7ca2f6653 100644
> --- a/drivers/md/bcache/super.c
> +++ b/drivers/md/bcache/super.c
> @@ -877,7 +877,6 @@ static int bcache_device_init(struct bcache_device *d, unsigned int block_size,
>
> d->disk->queue = q;
> q->queuedata = d;
> - q->backing_dev_info->congested_data = d;
> q->limits.max_hw_sectors = UINT_MAX;
> q->limits.max_sectors = UINT_MAX;
> q->limits.max_segment_size = UINT_MAX;
> diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
> index d3bb355819a421..24549dc92eeec5 100644
> --- a/drivers/md/dm-cache-target.c
> +++ b/drivers/md/dm-cache-target.c
> @@ -421,8 +421,6 @@ struct cache {
>
> struct rw_semaphore quiesce_lock;
>
> - struct dm_target_callbacks callbacks;
> -
> /*
> * origin_blocks entries, discarded if set.
> */
> @@ -2423,20 +2421,6 @@ static void set_cache_size(struct cache *cache, dm_cblock_t size)
> cache->cache_size = size;
> }
>
> -static int is_congested(struct dm_dev *dev, int bdi_bits)
> -{
> - struct request_queue *q = bdev_get_queue(dev->bdev);
> - return bdi_congested(q->backing_dev_info, bdi_bits);
> -}
> -
> -static int cache_is_congested(struct dm_target_callbacks *cb, int bdi_bits)
> -{
> - struct cache *cache = container_of(cb, struct cache, callbacks);
> -
> - return is_congested(cache->origin_dev, bdi_bits) ||
> - is_congested(cache->cache_dev, bdi_bits);
> -}
> -
> #define DEFAULT_MIGRATION_THRESHOLD 2048
>
> static int cache_create(struct cache_args *ca, struct cache **result)
> @@ -2471,9 +2455,6 @@ static int cache_create(struct cache_args *ca, struct cache **result)
> goto bad;
> }
>
> - cache->callbacks.congested_fn = cache_is_congested;
> - dm_table_add_target_callbacks(ti->table, &cache->callbacks);
> -
> cache->metadata_dev = ca->metadata_dev;
> cache->origin_dev = ca->origin_dev;
> cache->cache_dev = ca->cache_dev;
[snipped]
On Wed, Jul 1, 2020 at 2:06 AM Christoph Hellwig <[email protected]> wrote:
>
> Except for pktdvd, the only places setting congested bits are file
> systems that allocate their own backing_dev_info structures. And
> pktdvd is a deprecated driver that isn't useful in stack setup
> either. So remove the dead congested_fn stacking infrastructure.
>
> Signed-off-by: Christoph Hellwig <[email protected]>
For md bits:
Acked-by: Song Liu <[email protected]>
On 7/1/20 3:06 AM, Christoph Hellwig wrote:
> Hi Jens,
>
> we have a lot of bdi congestion related code that is left around without
> any use. This series removes it in preparation of sorting out the bdi
> lifetime rules properly.
Please run series like this through a full compilation, for both this one
and the previous series I had to fix up issues like this:
drivers/md/bcache/request.c: In function ‘bch_cached_dev_request_init’:
drivers/md/bcache/request.c:1233:18: warning: unused variable ‘g’ [-Wunused-variable]
1233 | struct gendisk *g = dc->disk.disk;
| ^
drivers/md/bcache/request.c: In function ‘bch_flash_dev_request_init’:
drivers/md/bcache/request.c:1320:18: warning: unused variable ‘g’ [-Wunused-variable]
1320 | struct gendisk *g = d->disk;
| ^
Did the same here, applied it.
--
Jens Axboe
On Wed, Jul 08, 2020 at 05:14:29PM -0600, Jens Axboe wrote:
> On 7/1/20 3:06 AM, Christoph Hellwig wrote:
> > Hi Jens,
> >
> > we have a lot of bdi congestion related code that is left around without
> > any use. This series removes it in preparation of sorting out the bdi
> > lifetime rules properly.
>
> Please run series like this through a full compilation, for both this one
> and the previous series I had to fix up issues like this:
>
> drivers/md/bcache/request.c: In function ‘bch_cached_dev_request_init’:
> drivers/md/bcache/request.c:1233:18: warning: unused variable ‘g’ [-Wunused-variable]
> 1233 | struct gendisk *g = dc->disk.disk;
> | ^
> drivers/md/bcache/request.c: In function ‘bch_flash_dev_request_init’:
> drivers/md/bcache/request.c:1320:18: warning: unused variable ‘g’ [-Wunused-variable]
> 1320 | struct gendisk *g = d->disk;
> | ^
>
> Did the same here, applied it.
And just like the previous one I did, and the compiler did not complain.
There must be something about certain gcc versions not warning about
variables that are initialized but not otherwise used.
On 7/8/20 11:32 PM, Christoph Hellwig wrote:
> On Wed, Jul 08, 2020 at 05:14:29PM -0600, Jens Axboe wrote:
>> On 7/1/20 3:06 AM, Christoph Hellwig wrote:
>>> Hi Jens,
>>>
>>> we have a lot of bdi congestion related code that is left around without
>>> any use. This series removes it in preparation of sorting out the bdi
>>> lifetime rules properly.
>>
>> Please run series like this through a full compilation, for both this one
>> and the previous series I had to fix up issues like this:
>>
>> drivers/md/bcache/request.c: In function ‘bch_cached_dev_request_init’:
>> drivers/md/bcache/request.c:1233:18: warning: unused variable ‘g’ [-Wunused-variable]
>> 1233 | struct gendisk *g = dc->disk.disk;
>> | ^
>> drivers/md/bcache/request.c: In function ‘bch_flash_dev_request_init’:
>> drivers/md/bcache/request.c:1320:18: warning: unused variable ‘g’ [-Wunused-variable]
>> 1320 | struct gendisk *g = d->disk;
>> | ^
>>
>> Did the same here, applied it.
>
> And just like the previous one I did, and the compiler did not complain.
> There must be something about certain gcc versions not warning about
> variables that are initialized but not otherwise used.
Are you using gcc-10? It sucks for that. gcc-9 seems to reliably hit
these cases for me, not sure why gcc-10 doesn't. And the ones quoted
above are about as trivial as they can get.
--
Jens Axboe
On Thu, Jul 09, 2020 at 07:58:58AM -0600, Jens Axboe wrote:
> On 7/8/20 11:32 PM, Christoph Hellwig wrote:
> > On Wed, Jul 08, 2020 at 05:14:29PM -0600, Jens Axboe wrote:
> >> On 7/1/20 3:06 AM, Christoph Hellwig wrote:
> >>> Hi Jens,
> >>>
> >>> we have a lot of bdi congestion related code that is left around without
> >>> any use. This series removes it in preparation of sorting out the bdi
> >>> lifetime rules properly.
> >>
> >> Please run series like this through a full compilation, for both this one
> >> and the previous series I had to fix up issues like this:
> >>
> >> drivers/md/bcache/request.c: In function ‘bch_cached_dev_request_init’:
> >> drivers/md/bcache/request.c:1233:18: warning: unused variable ‘g’ [-Wunused-variable]
> >> 1233 | struct gendisk *g = dc->disk.disk;
> >> | ^
> >> drivers/md/bcache/request.c: In function ‘bch_flash_dev_request_init’:
> >> drivers/md/bcache/request.c:1320:18: warning: unused variable ‘g’ [-Wunused-variable]
> >> 1320 | struct gendisk *g = d->disk;
> >> | ^
> >>
> >> Did the same here, applied it.
> >
> > And just like the previous one I did, and the compiler did not complain.
> > There must be something about certain gcc versions not warning about
> > variables that are initialized but not otherwise used.
>
> Are you using gcc-10? It sucks for that. gcc-9 seems to reliably hit
> these cases for me, not sure why gcc-10 doesn't. And the ones quoted
> above are about as trivial as they can get.
gcc-9.3 from Debian -testing. And yes, I'm really surprised it didn't
find those.