Re: linux-image 4.3.3 bcache stability patches
Hello list, Ben,
Would it be possible to include latest bcache stability patches from
https://github.com/torvalds/linux/compare/master...ewheelerinc:bcache-patches-for-3.17
According bcache developers (Kent Overstreet and others) it merges
fine from 3.17 up to 4.4 as they concerns only bcache driver:
bcache/btree.c
bcache/super.c
bcache/writeback.c
bcache/writeback.h
see https://lkml.org/lkml/2015/12/29/379
This should improve SSD lockups.
Thank you
Martin
I combined them into one attached file and they merging fine into
linux-4.3.3.unchanged:
--- b/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -1741,6 +1741,7 @@
do {
ret = btree_root(gc_root, c, &op, &writes, &stats);
closure_sync(&writes);
+ cond_resched();
if (ret && ret != -EAGAIN)
pr_warn("gc failed!");
@@ -2162,8 +2163,10 @@
rw_lock(true, b, b->level);
if (b->key.ptr[0] != btree_ptr ||
- b->seq != seq + 1)
+ b->seq != seq + 1) {
+ op->lock = b->level;
goto out;
+ }
}
SET_KEY_PTRS(check_key, 1);
unchanged:
--- b/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -708,6 +708,8 @@
WARN(sysfs_create_link(&d->kobj, &c->kobj, "cache") ||
sysfs_create_link(&c->kobj, &d->kobj, d->name),
"Couldn't create device <-> cache set symlinks");
+
+ clear_bit(BCACHE_DEV_UNLINK_DONE, &d->flags);
}
static void bcache_device_detach(struct bcache_device *d)
@@ -877,8 +879,11 @@
buf[SB_LABEL_SIZE] = '\0';
env[2] = kasprintf(GFP_KERNEL, "CACHED_LABEL=%s", buf);
- if (atomic_xchg(&dc->running, 1))
+ if (atomic_xchg(&dc->running, 1)) {
+ kfree(env[1]);
+ kfree(env[2]);
return;
+ }
if (!d->c &&
BDEV_STATE(&dc->sb) != BDEV_STATE_NONE) {
unchanged:
--- b/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1971,6 +1971,8 @@
else
err = "device busy";
mutex_unlock(&bch_register_lock);
+ if (attr == &ksysfs_register_quiet)
+ goto out;
}
goto err;
}
@@ -2009,8 +2011,7 @@
err_close:
blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
err:
- if (attr != &ksysfs_register_quiet)
- pr_info("error opening %s: %s", path, err);
+ pr_info("error opening %s: %s", path, err);
ret = -EINVAL;
goto out;
}
@@ -2104,8 +2105,10 @@
closure_debug_init();
bcache_major = register_blkdev(0, "bcache");
- if (bcache_major < 0)
+ if (bcache_major < 0) {
+ unregister_reboot_notifier(&reboot);
return bcache_major;
+ }
if (!(bcache_wq = create_workqueue("bcache")) ||
!(bcache_kobj = kobject_create_and_add("bcache", fs_kobj)) ||
unchanged:
--- a/drivers/md/bcache/writeback.h
+++ b/drivers/md/bcache/writeback.h
@@ -63,7 +63,8 @@ static inline bool should_writeback(struct cached_dev *dc, struct bio *bio,
static inline void bch_writeback_queue(struct cached_dev *dc)
{
- wake_up_process(dc->writeback_thread);
+ if (!IS_ERR_OR_NULL(dc->writeback_thread))
+ wake_up_process(dc->writeback_thread);
}
static inline void bch_writeback_add(struct cached_dev *dc)
only in patch2:
unchanged:
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -323,6 +323,10 @@ void bcache_dev_sectors_dirty_add(struct cache_set *c, unsigned inode,
static bool dirty_pred(struct keybuf *buf, struct bkey *k)
{
+ struct cached_dev *dc = container_of(buf, struct cached_dev, writeback_keys);
+
+ BUG_ON(KEY_INODE(k) != dc->disk.id);
+
return KEY_DIRTY(k);
}
@@ -372,11 +376,24 @@ static void refill_full_stripes(struct cached_dev *dc)
}
}
+/*
+ * Returns true if we scanned the entire disk
+ */
static bool refill_dirty(struct cached_dev *dc)
{
struct keybuf *buf = &dc->writeback_keys;
+ struct bkey start = KEY(dc->disk.id, 0, 0);
struct bkey end = KEY(dc->disk.id, MAX_KEY_OFFSET, 0);
- bool searched_from_start = false;
+ struct bkey start_pos;
+
+ /*
+ * make sure keybuf pos is inside the range for this disk - at bringup
+ * we might not be attached yet so this disk's inode nr isn't
+ * initialized then
+ */
+ if (bkey_cmp(&buf->last_scanned, &start) < 0 ||
+ bkey_cmp(&buf->last_scanned, &end) > 0)
+ buf->last_scanned = start;
if (dc->partial_stripes_expensive) {
refill_full_stripes(dc);
@@ -384,14 +401,20 @@ static bool refill_dirty(struct cached_dev *dc)
return false;
}
- if (bkey_cmp(&buf->last_scanned, &end) >= 0) {
- buf->last_scanned = KEY(dc->disk.id, 0, 0);
- searched_from_start = true;
- }
-
+ start_pos = buf->last_scanned;
bch_refill_keybuf(dc->disk.c, buf, &end, dirty_pred);
- return bkey_cmp(&buf->last_scanned, &end) >= 0 && searched_from_start;
+ if (bkey_cmp(&buf->last_scanned, &end) < 0)
+ return false;
+
+ /*
+ * If we get to the end start scanning again from the beginning, and
+ * only scan up to where we initially started scanning from:
+ */
+ buf->last_scanned = start;
+ bch_refill_keybuf(dc->disk.c, buf, &start_pos, dirty_pred);
+
+ return bkey_cmp(&buf->last_scanned, &start_pos) >= 0;
}
static int bch_writeback_thread(void *arg)
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