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path: root/drivers/md/bcache/writeback.c
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Diffstat (limited to 'drivers/md/bcache/writeback.c')
-rw-r--r--drivers/md/bcache/writeback.c133
1 files changed, 120 insertions, 13 deletions
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index 2714ed3991d1..22cbff551628 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -9,6 +9,9 @@
#include "bcache.h"
#include "btree.h"
#include "debug.h"
+#include "writeback.h"
+
+#include <trace/events/bcache.h>
static struct workqueue_struct *dirty_wq;
@@ -36,7 +39,7 @@ static void __update_writeback_rate(struct cached_dev *dc)
int change = 0;
int64_t error;
- int64_t dirty = atomic_long_read(&dc->disk.sectors_dirty);
+ int64_t dirty = bcache_dev_sectors_dirty(&dc->disk);
int64_t derivative = dirty - dc->disk.sectors_dirty_last;
dc->disk.sectors_dirty_last = dirty;
@@ -105,6 +108,31 @@ static bool dirty_pred(struct keybuf *buf, struct bkey *k)
return KEY_DIRTY(k);
}
+static bool dirty_full_stripe_pred(struct keybuf *buf, struct bkey *k)
+{
+ uint64_t stripe;
+ unsigned nr_sectors = KEY_SIZE(k);
+ struct cached_dev *dc = container_of(buf, struct cached_dev,
+ writeback_keys);
+ unsigned stripe_size = 1 << dc->disk.stripe_size_bits;
+
+ if (!KEY_DIRTY(k))
+ return false;
+
+ stripe = KEY_START(k) >> dc->disk.stripe_size_bits;
+ while (1) {
+ if (atomic_read(dc->disk.stripe_sectors_dirty + stripe) !=
+ stripe_size)
+ return false;
+
+ if (nr_sectors <= stripe_size)
+ return true;
+
+ nr_sectors -= stripe_size;
+ stripe++;
+ }
+}
+
static void dirty_init(struct keybuf_key *w)
{
struct dirty_io *io = w->private;
@@ -149,7 +177,22 @@ static void refill_dirty(struct closure *cl)
searched_from_start = true;
}
- bch_refill_keybuf(dc->disk.c, buf, &end);
+ if (dc->partial_stripes_expensive) {
+ uint64_t i;
+
+ for (i = 0; i < dc->disk.nr_stripes; i++)
+ if (atomic_read(dc->disk.stripe_sectors_dirty + i) ==
+ 1 << dc->disk.stripe_size_bits)
+ goto full_stripes;
+
+ goto normal_refill;
+full_stripes:
+ bch_refill_keybuf(dc->disk.c, buf, &end,
+ dirty_full_stripe_pred);
+ } else {
+normal_refill:
+ bch_refill_keybuf(dc->disk.c, buf, &end, dirty_pred);
+ }
if (bkey_cmp(&buf->last_scanned, &end) >= 0 && searched_from_start) {
/* Searched the entire btree - delay awhile */
@@ -181,10 +224,8 @@ void bch_writeback_queue(struct cached_dev *dc)
}
}
-void bch_writeback_add(struct cached_dev *dc, unsigned sectors)
+void bch_writeback_add(struct cached_dev *dc)
{
- atomic_long_add(sectors, &dc->disk.sectors_dirty);
-
if (!atomic_read(&dc->has_dirty) &&
!atomic_xchg(&dc->has_dirty, 1)) {
atomic_inc(&dc->count);
@@ -203,6 +244,34 @@ void bch_writeback_add(struct cached_dev *dc, unsigned sectors)
}
}
+void bcache_dev_sectors_dirty_add(struct cache_set *c, unsigned inode,
+ uint64_t offset, int nr_sectors)
+{
+ struct bcache_device *d = c->devices[inode];
+ unsigned stripe_size, stripe_offset;
+ uint64_t stripe;
+
+ if (!d)
+ return;
+
+ stripe_size = 1 << d->stripe_size_bits;
+ stripe = offset >> d->stripe_size_bits;
+ stripe_offset = offset & (stripe_size - 1);
+
+ while (nr_sectors) {
+ int s = min_t(unsigned, abs(nr_sectors),
+ stripe_size - stripe_offset);
+
+ if (nr_sectors < 0)
+ s = -s;
+
+ atomic_add(s, d->stripe_sectors_dirty + stripe);
+ nr_sectors -= s;
+ stripe_offset = 0;
+ stripe++;
+ }
+}
+
/* Background writeback - IO loop */
static void dirty_io_destructor(struct closure *cl)
@@ -216,9 +285,10 @@ static void write_dirty_finish(struct closure *cl)
struct dirty_io *io = container_of(cl, struct dirty_io, cl);
struct keybuf_key *w = io->bio.bi_private;
struct cached_dev *dc = io->dc;
- struct bio_vec *bv = bio_iovec_idx(&io->bio, io->bio.bi_vcnt);
+ struct bio_vec *bv;
+ int i;
- while (bv-- != io->bio.bi_io_vec)
+ bio_for_each_segment_all(bv, &io->bio, i)
__free_page(bv->bv_page);
/* This is kind of a dumb way of signalling errors. */
@@ -236,10 +306,12 @@ static void write_dirty_finish(struct closure *cl)
for (i = 0; i < KEY_PTRS(&w->key); i++)
atomic_inc(&PTR_BUCKET(dc->disk.c, &w->key, i)->pin);
- pr_debug("clearing %s", pkey(&w->key));
bch_btree_insert(&op, dc->disk.c);
closure_sync(&op.cl);
+ if (op.insert_collision)
+ trace_bcache_writeback_collision(&w->key);
+
atomic_long_inc(op.insert_collision
? &dc->disk.c->writeback_keys_failed
: &dc->disk.c->writeback_keys_done);
@@ -275,7 +347,6 @@ static void write_dirty(struct closure *cl)
io->bio.bi_bdev = io->dc->bdev;
io->bio.bi_end_io = dirty_endio;
- trace_bcache_write_dirty(&io->bio);
closure_bio_submit(&io->bio, cl, &io->dc->disk);
continue_at(cl, write_dirty_finish, dirty_wq);
@@ -296,7 +367,6 @@ static void read_dirty_submit(struct closure *cl)
{
struct dirty_io *io = container_of(cl, struct dirty_io, cl);
- trace_bcache_read_dirty(&io->bio);
closure_bio_submit(&io->bio, cl, &io->dc->disk);
continue_at(cl, write_dirty, dirty_wq);
@@ -349,10 +419,10 @@ static void read_dirty(struct closure *cl)
io->bio.bi_rw = READ;
io->bio.bi_end_io = read_dirty_endio;
- if (bch_bio_alloc_pages(&io->bio, GFP_KERNEL))
+ if (bio_alloc_pages(&io->bio, GFP_KERNEL))
goto err_free;
- pr_debug("%s", pkey(&w->key));
+ trace_bcache_writeback(&w->key);
closure_call(&io->cl, read_dirty_submit, NULL, &dc->disk.cl);
@@ -375,12 +445,49 @@ err:
refill_dirty(cl);
}
+/* Init */
+
+static int bch_btree_sectors_dirty_init(struct btree *b, struct btree_op *op,
+ struct cached_dev *dc)
+{
+ struct bkey *k;
+ struct btree_iter iter;
+
+ bch_btree_iter_init(b, &iter, &KEY(dc->disk.id, 0, 0));
+ while ((k = bch_btree_iter_next_filter(&iter, b, bch_ptr_bad)))
+ if (!b->level) {
+ if (KEY_INODE(k) > dc->disk.id)
+ break;
+
+ if (KEY_DIRTY(k))
+ bcache_dev_sectors_dirty_add(b->c, dc->disk.id,
+ KEY_START(k),
+ KEY_SIZE(k));
+ } else {
+ btree(sectors_dirty_init, k, b, op, dc);
+ if (KEY_INODE(k) > dc->disk.id)
+ break;
+
+ cond_resched();
+ }
+
+ return 0;
+}
+
+void bch_sectors_dirty_init(struct cached_dev *dc)
+{
+ struct btree_op op;
+
+ bch_btree_op_init_stack(&op);
+ btree_root(sectors_dirty_init, dc->disk.c, &op, dc);
+}
+
void bch_cached_dev_writeback_init(struct cached_dev *dc)
{
closure_init_unlocked(&dc->writeback);
init_rwsem(&dc->writeback_lock);
- bch_keybuf_init(&dc->writeback_keys, dirty_pred);
+ bch_keybuf_init(&dc->writeback_keys);
dc->writeback_metadata = true;
dc->writeback_running = true;
generated by cgit v1.2.3 (git 2.46.0) at 2025-11-03 23:55:35 +0000