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authorLinus Torvalds <torvalds@linux-foundation.org>2018-11-02 11:25:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-11-02 11:25:48 -0700
commit5f21585384a4a69b8bfdd2cae7e3648ae805f57d (patch)
treeb976d6e847b7209fb54cf78821a59951a7e9e8cd
parentfcc37f76a995cc08546b88b83f9bb5da11307a0b (diff)
parent9fe5c59ff6a1e5e26a39b75489a1420e7eaaf0b1 (diff)
downloadlinux-5f21585384a4a69b8bfdd2cae7e3648ae805f57d.tar.gz
Merge tag 'for-linus-20181102' of git://git.kernel.dk/linux-block
Pull block layer fixes from Jens Axboe: "The biggest part of this pull request is the revert of the blkcg cleanup series. It had one fix earlier for a stacked device issue, but another one was reported. Rather than play whack-a-mole with this, revert the entire series and try again for the next kernel release. Apart from that, only small fixes/changes. Summary: - Indentation fixup for mtip32xx (Colin Ian King) - The blkcg cleanup series revert (Dennis Zhou) - Two NVMe fixes. One fixing a regression in the nvme request initialization in this merge window, causing nvme-fc to not work. The other is a suspend/resume p2p resource issue (James, Keith) - Fix sg discard merge, allowing us to merge in cases where we didn't before (Jianchao Wang) - Call rq_qos_exit() after the queue is frozen, preventing a hang (Ming) - Fix brd queue setup, fixing an oops if we fail setting up all devices (Ming)" * tag 'for-linus-20181102' of git://git.kernel.dk/linux-block: nvme-pci: fix conflicting p2p resource adds nvme-fc: fix request private initialization blkcg: revert blkcg cleanups series block: brd: associate with queue until adding disk block: call rq_qos_exit() after queue is frozen mtip32xx: clean an indentation issue, remove extraneous tabs block: fix the DISCARD request merge
-rw-r--r--Documentation/admin-guide/cgroup-v2.rst8
-rw-r--r--block/bfq-cgroup.c4
-rw-r--r--block/bfq-iosched.c2
-rw-r--r--block/bio.c174
-rw-r--r--block/blk-cgroup.c123
-rw-r--r--block/blk-core.c4
-rw-r--r--block/blk-iolatency.c26
-rw-r--r--block/blk-merge.c46
-rw-r--r--block/blk-sysfs.c2
-rw-r--r--block/blk-throttle.c13
-rw-r--r--block/bounce.c4
-rw-r--r--block/cfq-iosched.c4
-rw-r--r--drivers/block/brd.c16
-rw-r--r--drivers/block/loop.c5
-rw-r--r--drivers/block/mtip32xx/mtip32xx.c4
-rw-r--r--drivers/md/raid0.c2
-rw-r--r--drivers/nvme/host/fc.c2
-rw-r--r--drivers/nvme/host/pci.c5
-rw-r--r--fs/buffer.c10
-rw-r--r--fs/ext4/page-io.c2
-rw-r--r--include/linux/bio.h26
-rw-r--r--include/linux/blk-cgroup.h145
-rw-r--r--include/linux/blk_types.h1
-rw-r--r--include/linux/cgroup.h2
-rw-r--r--include/linux/writeback.h5
-rw-r--r--kernel/cgroup/cgroup.c48
-rw-r--r--kernel/trace/blktrace.c4
-rw-r--r--mm/page_io.c2
28 files changed, 265 insertions, 424 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 8384c681a4b2..476722b7b636 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1879,10 +1879,8 @@ following two functions.
wbc_init_bio(@wbc, @bio)
Should be called for each bio carrying writeback data and
- associates the bio with the inode's owner cgroup and the
- corresponding request queue. This must be called after
- a queue (device) has been associated with the bio and
- before submission.
+ associates the bio with the inode's owner cgroup. Can be
+ called anytime between bio allocation and submission.
wbc_account_io(@wbc, @page, @bytes)
Should be called for each data segment being written out.
@@ -1901,7 +1899,7 @@ the configuration, the bio may be executed at a lower priority and if
the writeback session is holding shared resources, e.g. a journal
entry, may lead to priority inversion. There is no one easy solution
for the problem. Filesystems can try to work around specific problem
-cases by skipping wbc_init_bio() or using bio_associate_create_blkg()
+cases by skipping wbc_init_bio() or using bio_associate_blkcg()
directly.
diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index d9a7916ff0ab..9fe5952d117d 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c
@@ -642,7 +642,7 @@ void bfq_bic_update_cgroup(struct bfq_io_cq *bic, struct bio *bio)
uint64_t serial_nr;
rcu_read_lock();
- serial_nr = __bio_blkcg(bio)->css.serial_nr;
+ serial_nr = bio_blkcg(bio)->css.serial_nr;
/*
* Check whether blkcg has changed. The condition may trigger
@@ -651,7 +651,7 @@ void bfq_bic_update_cgroup(struct bfq_io_cq *bic, struct bio *bio)
if (unlikely(!bfqd) || likely(bic->blkcg_serial_nr == serial_nr))
goto out;
- bfqg = __bfq_bic_change_cgroup(bfqd, bic, __bio_blkcg(bio));
+ bfqg = __bfq_bic_change_cgroup(bfqd, bic, bio_blkcg(bio));
/*
* Update blkg_path for bfq_log_* functions. We cache this
* path, and update it here, for the following
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 6075100f03a5..3a27d31fcda6 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -4384,7 +4384,7 @@ static struct bfq_queue *bfq_get_queue(struct bfq_data *bfqd,
rcu_read_lock();
- bfqg = bfq_find_set_group(bfqd, __bio_blkcg(bio));
+ bfqg = bfq_find_set_group(bfqd, bio_blkcg(bio));
if (!bfqg) {
bfqq = &bfqd->oom_bfqq;
goto out;
diff --git a/block/bio.c b/block/bio.c
index c27f77befbac..d5368a445561 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -609,9 +609,7 @@ void __bio_clone_fast(struct bio *bio, struct bio *bio_src)
bio->bi_iter = bio_src->bi_iter;
bio->bi_io_vec = bio_src->bi_io_vec;
- bio_clone_blkg_association(bio, bio_src);
-
- blkcg_bio_issue_init(bio);
+ bio_clone_blkcg_association(bio, bio_src);
}
EXPORT_SYMBOL(__bio_clone_fast);
@@ -1956,151 +1954,69 @@ EXPORT_SYMBOL(bioset_init_from_src);
#ifdef CONFIG_BLK_CGROUP
-/**
- * bio_associate_blkg - associate a bio with the a blkg
- * @bio: target bio
- * @blkg: the blkg to associate
- *
- * This tries to associate @bio with the specified blkg. Association failure
- * is handled by walking up the blkg tree. Therefore, the blkg associated can
- * be anything between @blkg and the root_blkg. This situation only happens
- * when a cgroup is dying and then the remaining bios will spill to the closest
- * alive blkg.
- *
- * A reference will be taken on the @blkg and will be released when @bio is
- * freed.
- */
-int bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg)
-{
- if (unlikely(bio->bi_blkg))
- return -EBUSY;
- bio->bi_blkg = blkg_tryget_closest(blkg);
- return 0;
-}
-
-/**
- * __bio_associate_blkg_from_css - internal blkg association function
- *
- * This in the core association function that all association paths rely on.
- * A blkg reference is taken which is released upon freeing of the bio.
- */
-static int __bio_associate_blkg_from_css(struct bio *bio,
- struct cgroup_subsys_state *css)
-{
- struct request_queue *q = bio->bi_disk->queue;
- struct blkcg_gq *blkg;
- int ret;
-
- rcu_read_lock();
-
- if (!css || !css->parent)
- blkg = q->root_blkg;
- else
- blkg = blkg_lookup_create(css_to_blkcg(css), q);
-
- ret = bio_associate_blkg(bio, blkg);
-
- rcu_read_unlock();
- return ret;
-}
-
-/**
- * bio_associate_blkg_from_css - associate a bio with a specified css
- * @bio: target bio
- * @css: target css
- *
- * Associate @bio with the blkg found by combining the css's blkg and the
- * request_queue of the @bio. This falls back to the queue's root_blkg if
- * the association fails with the css.
- */
-int bio_associate_blkg_from_css(struct bio *bio,
- struct cgroup_subsys_state *css)
-{
- if (unlikely(bio->bi_blkg))
- return -EBUSY;
- return __bio_associate_blkg_from_css(bio, css);
-}
-EXPORT_SYMBOL_GPL(bio_associate_blkg_from_css);
-
#ifdef CONFIG_MEMCG
/**
- * bio_associate_blkg_from_page - associate a bio with the page's blkg
+ * bio_associate_blkcg_from_page - associate a bio with the page's blkcg
* @bio: target bio
* @page: the page to lookup the blkcg from
*
- * Associate @bio with the blkg from @page's owning memcg and the respective
- * request_queue. If cgroup_e_css returns NULL, fall back to the queue's
- * root_blkg.
- *
- * Note: this must be called after bio has an associated device.
+ * Associate @bio with the blkcg from @page's owning memcg. This works like
+ * every other associate function wrt references.
*/
-int bio_associate_blkg_from_page(struct bio *bio, struct page *page)
+int bio_associate_blkcg_from_page(struct bio *bio, struct page *page)
{
- struct cgroup_subsys_state *css;
- int ret;
+ struct cgroup_subsys_state *blkcg_css;
- if (unlikely(bio->bi_blkg))
+ if (unlikely(bio->bi_css))
return -EBUSY;
if (!page->mem_cgroup)
return 0;
-
- rcu_read_lock();
-
- css = cgroup_e_css(page->mem_cgroup->css.cgroup, &io_cgrp_subsys);
-
- ret = __bio_associate_blkg_from_css(bio, css);
-
- rcu_read_unlock();
- return ret;
+ blkcg_css = cgroup_get_e_css(page->mem_cgroup->css.cgroup,
+ &io_cgrp_subsys);
+ bio->bi_css = blkcg_css;
+ return 0;
}
#endif /* CONFIG_MEMCG */
/**
- * bio_associate_create_blkg - associate a bio with a blkg from q
- * @q: request_queue where bio is going
+ * bio_associate_blkcg - associate a bio with the specified blkcg
* @bio: target bio
+ * @blkcg_css: css of the blkcg to associate
+ *
+ * Associate @bio with the blkcg specified by @blkcg_css. Block layer will
+ * treat @bio as if it were issued by a task which belongs to the blkcg.
*
- * Associate @bio with the blkg found from the bio's css and the request_queue.
- * If one is not found, bio_lookup_blkg creates the blkg. This falls back to
- * the queue's root_blkg if association fails.
+ * This function takes an extra reference of @blkcg_css which will be put
+ * when @bio is released. The caller must own @bio and is responsible for
+ * synchronizing calls to this function.
*/
-int bio_associate_create_blkg(struct request_queue *q, struct bio *bio)
+int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css)
{
- struct cgroup_subsys_state *css;
- int ret = 0;
-
- /* someone has already associated this bio with a blkg */
- if (bio->bi_blkg)
- return ret;
-
- rcu_read_lock();
-
- css = blkcg_css();
-
- ret = __bio_associate_blkg_from_css(bio, css);
-
- rcu_read_unlock();
- return ret;
+ if (unlikely(bio->bi_css))
+ return -EBUSY;
+ css_get(blkcg_css);
+ bio->bi_css = blkcg_css;
+ return 0;
}
+EXPORT_SYMBOL_GPL(bio_associate_blkcg);
/**
- * bio_reassociate_blkg - reassociate a bio with a blkg from q
- * @q: request_queue where bio is going
+ * bio_associate_blkg - associate a bio with the specified blkg
* @bio: target bio
+ * @blkg: the blkg to associate
*
- * When submitting a bio, multiple recursive calls to make_request() may occur.
- * This causes the initial associate done in blkcg_bio_issue_check() to be
- * incorrect and reference the prior request_queue. This performs reassociation
- * when this situation happens.
+ * Associate @bio with the blkg specified by @blkg. This is the queue specific
+ * blkcg information associated with the @bio, a reference will be taken on the
+ * @blkg and will be freed when the bio is freed.
*/
-int bio_reassociate_blkg(struct request_queue *q, struct bio *bio)
+int bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg)
{
- if (bio->bi_blkg) {
- blkg_put(bio->bi_blkg);
- bio->bi_blkg = NULL;
- }
-
- return bio_associate_create_blkg(q, bio);
+ if (unlikely(bio->bi_blkg))
+ return -EBUSY;
+ if (!blkg_try_get(blkg))
+ return -ENODEV;
+ bio->bi_blkg = blkg;
+ return 0;
}
/**
@@ -2113,6 +2029,10 @@ void bio_disassociate_task(struct bio *bio)
put_io_context(bio->bi_ioc);
bio->bi_ioc = NULL;
}
+ if (bio->bi_css) {
+ css_put(bio->bi_css);
+ bio->bi_css = NULL;
+ }
if (bio->bi_blkg) {
blkg_put(bio->bi_blkg);
bio->bi_blkg = NULL;
@@ -2120,16 +2040,16 @@ void bio_disassociate_task(struct bio *bio)
}
/**
- * bio_clone_blkg_association - clone blkg association from src to dst bio
+ * bio_clone_blkcg_association - clone blkcg association from src to dst bio
* @dst: destination bio
* @src: source bio
*/
-void bio_clone_blkg_association(struct bio *dst, struct bio *src)
+void bio_clone_blkcg_association(struct bio *dst, struct bio *src)
{
- if (src->bi_blkg)
- bio_associate_blkg(dst, src->bi_blkg);
+ if (src->bi_css)
+ WARN_ON(bio_associate_blkcg(dst, src->bi_css));
}
-EXPORT_SYMBOL_GPL(bio_clone_blkg_association);
+EXPORT_SYMBOL_GPL(bio_clone_blkcg_association);
#endif /* CONFIG_BLK_CGROUP */
static void __init biovec_init_slabs(void)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 992da5592c6e..c630e02836a8 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -84,37 +84,6 @@ static void blkg_free(struct blkcg_gq *blkg)
kfree(blkg);
}
-static void __blkg_release(struct rcu_head *rcu)
-{
- struct blkcg_gq *blkg = container_of(rcu, struct blkcg_gq, rcu_head);
-
- percpu_ref_exit(&blkg->refcnt);
-
- /* release the blkcg and parent blkg refs this blkg has been holding */
- css_put(&blkg->blkcg->css);
- if (blkg->parent)
- blkg_put(blkg->parent);
-
- wb_congested_put(blkg->wb_congested);
-
- blkg_free(blkg);
-}
-
-/*
- * A group is RCU protected, but having an rcu lock does not mean that one
- * can access all the fields of blkg and assume these are valid. For
- * example, don't try to follow throtl_data and request queue links.
- *
- * Having a reference to blkg under an rcu allows accesses to only values
- * local to groups like group stats and group rate limits.
- */
-static void blkg_release(struct percpu_ref *ref)
-{
- struct blkcg_gq *blkg = container_of(ref, struct blkcg_gq, refcnt);
-
- call_rcu(&blkg->rcu_head, __blkg_release);
-}
-
/**
* blkg_alloc - allocate a blkg
* @blkcg: block cgroup the new blkg is associated with
@@ -141,6 +110,7 @@ static struct blkcg_gq *blkg_alloc(struct blkcg *blkcg, struct request_queue *q,
blkg->q = q;
INIT_LIST_HEAD(&blkg->q_node);
blkg->blkcg = blkcg;
+ atomic_set(&blkg->refcnt, 1);
/* root blkg uses @q->root_rl, init rl only for !root blkgs */
if (blkcg != &blkcg_root) {
@@ -247,11 +217,6 @@ static struct blkcg_gq *blkg_create(struct blkcg *blkcg,
blkg_get(blkg->parent);
}
- ret = percpu_ref_init(&blkg->refcnt, blkg_release, 0,
- GFP_NOWAIT | __GFP_NOWARN);
- if (ret)
- goto err_cancel_ref;
-
/* invoke per-policy init */
for (i = 0; i < BLKCG_MAX_POLS; i++) {
struct blkcg_policy *pol = blkcg_policy[i];
@@ -284,8 +249,6 @@ static struct blkcg_gq *blkg_create(struct blkcg *blkcg,
blkg_put(blkg);
return ERR_PTR(ret);
-err_cancel_ref:
- percpu_ref_exit(&blkg->refcnt);
err_put_congested:
wb_congested_put(wb_congested);
err_put_css:
@@ -296,7 +259,7 @@ err_free_blkg:
}
/**
- * __blkg_lookup_create - lookup blkg, try to create one if not there
+ * blkg_lookup_create - lookup blkg, try to create one if not there
* @blkcg: blkcg of interest
* @q: request_queue of interest
*
@@ -305,11 +268,12 @@ err_free_blkg:
* that all non-root blkg's have access to the parent blkg. This function
* should be called under RCU read lock and @q->queue_lock.
*
- * Returns the blkg or the closest blkg if blkg_create fails as it walks
- * down from root.
+ * Returns pointer to the looked up or created blkg on success, ERR_PTR()
+ * value on error. If @q is dead, returns ERR_PTR(-EINVAL). If @q is not
+ * dead and bypassing, returns ERR_PTR(-EBUSY).
*/
-struct blkcg_gq *__blkg_lookup_create(struct blkcg *blkcg,
- struct request_queue *q)
+struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg,
+ struct request_queue *q)
{
struct blkcg_gq *blkg;
@@ -321,7 +285,7 @@ struct blkcg_gq *__blkg_lookup_create(struct blkcg *blkcg,
* we shouldn't allow anything to go through for a bypassing queue.
*/
if (unlikely(blk_queue_bypass(q)))
- return q->root_blkg;
+ return ERR_PTR(blk_queue_dying(q) ? -ENODEV : -EBUSY);
blkg = __blkg_lookup(blkcg, q, true);
if (blkg)
@@ -329,58 +293,23 @@ struct blkcg_gq *__blkg_lookup_create(struct blkcg *blkcg,
/*
* Create blkgs walking down from blkcg_root to @blkcg, so that all
- * non-root blkgs have access to their parents. Returns the closest
- * blkg to the intended blkg should blkg_create() fail.
+ * non-root blkgs have access to their parents.
*/
while (true) {
struct blkcg *pos = blkcg;
struct blkcg *parent = blkcg_parent(blkcg);
- struct blkcg_gq *ret_blkg = q->root_blkg;
-
- while (parent) {
- blkg = __blkg_lookup(parent, q, false);
- if (blkg) {
- /* remember closest blkg */
- ret_blkg = blkg;
- break;
- }
+
+ while (parent && !__blkg_lookup(parent, q, false)) {
pos = parent;
parent = blkcg_parent(parent);
}
blkg = blkg_create(pos, q, NULL);
- if (IS_ERR(blkg))
- return ret_blkg;
- if (pos == blkcg)
+ if (pos == blkcg || IS_ERR(blkg))
return blkg;
}
}
-/**
- * blkg_lookup_create - find or create a blkg
- * @blkcg: target block cgroup
- * @q: target request_queue
- *
- * This looks up or creates the blkg representing the unique pair
- * of the blkcg and the request_queue.
- */
-struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg,
- struct request_queue *q)
-{
- struct blkcg_gq *blkg = blkg_lookup(blkcg, q);
- unsigned long flags;
-
- if (unlikely(!blkg)) {
- spin_lock_irqsave(q->queue_lock, flags);
-
- blkg = __blkg_lookup_create(blkcg, q);
-
- spin_unlock_irqrestore(q->queue_lock, flags);
- }
-
- return blkg;
-}
-
static void blkg_destroy(struct blkcg_gq *blkg)
{
struct blkcg *blkcg = blkg->blkcg;
@@ -424,7 +353,7 @@ static void blkg_destroy(struct blkcg_gq *blkg)
* Put the reference taken at the time of creation so that when all
* queues are gone, group can be destroyed.
*/
- percpu_ref_kill(&blkg->refcnt);
+ blkg_put(blkg);
}
/**
@@ -452,6 +381,29 @@ static void blkg_destroy_all(struct request_queue *q)
}
/*
+ * A group is RCU protected, but having an rcu lock does not mean that one
+ * can access all the fields of blkg and assume these are valid. For
+ * example, don't try to follow throtl_data and request queue links.
+ *
+ * Having a reference to blkg under an rcu allows accesses to only values
+ * local to groups like group stats and group rate limits.
+ */
+void __blkg_release_rcu(struct rcu_head *rcu_head)
+{
+ struct blkcg_gq *blkg = container_of(rcu_head, struct blkcg_gq, rcu_head);
+
+ /* release the blkcg and parent blkg refs this blkg has been holding */
+ css_put(&blkg->blkcg->css);
+ if (blkg->parent)
+ blkg_put(blkg->parent);
+
+ wb_congested_put(blkg->wb_congested);
+
+ blkg_free(blkg);
+}
+EXPORT_SYMBOL_GPL(__blkg_release_rcu);
+
+/*
* The next function used by blk_queue_for_each_rl(). It's a bit tricky
* because the root blkg uses @q->root_rl instead of its own rl.
*/
@@ -1796,7 +1748,8 @@ void blkcg_maybe_throttle_current(void)
blkg = blkg_lookup(blkcg, q);
if (!blkg)
goto out;
- if (!blkg_tryget(blkg))
+ blkg = blkg_try_get(blkg);
+ if (!blkg)
goto out;
rcu_read_unlock();
diff --git a/block/blk-core.c b/block/blk-core.c
index bc6ea87d10e0..ce12515f9b9b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -785,6 +785,9 @@ void blk_cleanup_queue(struct request_queue *q)
* prevent that q->request_fn() gets invoked after draining finished.
*/
blk_freeze_queue(q);
+
+ rq_qos_exit(q);
+
spin_lock_irq(lock);
queue_flag_set(QUEUE_FLAG_DEAD, q);
spin_unlock_irq(lock);
@@ -2432,7 +2435,6 @@ blk_qc_t generic_make_request(struct bio *bio)
if (q)
blk_queue_exit(q);
q = bio->bi_disk->queue;
- bio_reassociate_blkg(q, bio);
flags = 0;
if (bio->bi_opf & REQ_NOWAIT)
flags = BLK_MQ_REQ_NOWAIT;
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index 28f80d227528..38c35c32aff2 100644
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -482,12 +482,34 @@ static void blkcg_iolatency_throttle(struct rq_qos *rqos, struct bio *bio,
spinlock_t *lock)
{
struct blk_iolatency *blkiolat = BLKIOLATENCY(rqos);
- struct blkcg_gq *blkg = bio->bi_blkg;
+ struct blkcg *blkcg;
+ struct blkcg_gq *blkg;
+ struct request_queue *q = rqos->q;
bool issue_as_root = bio_issue_as_root_blkg(bio);
if (!blk_iolatency_enabled(blkiolat))
return;
+ rcu_read_lock();
+ blkcg = bio_blkcg(bio);
+ bio_associate_blkcg(bio, &blkcg->css);
+ blkg = blkg_lookup(blkcg, q);
+ if (unlikely(!blkg)) {
+ if (!lock)
+ spin_lock_irq(q->queue_lock);
+ blkg = blkg_lookup_create(blkcg, q);
+ if (IS_ERR(blkg))
+ blkg = NULL;
+ if (!lock)
+ spin_unlock_irq(q->queue_lock);
+ }
+ if (!blkg)
+ goto out;
+
+ bio_issue_init(&bio->bi_issue, bio_sectors(bio));
+ bio_associate_blkg(bio, blkg);
+out:
+ rcu_read_unlock();
while (blkg && blkg->parent) {
struct iolatency_grp *iolat = blkg_to_lat(blkg);
if (!iolat) {
@@ -708,7 +730,7 @@ static void blkiolatency_timer_fn(struct timer_list *t)
* We could be exiting, don't access the pd unless we have a
* ref on the blkg.
*/
- if (!blkg_tryget(blkg))
+ if (!blkg_try_get(blkg))
continue;
iolat = blkg_to_lat(blkg);
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 42a46744c11b..6b5ad275ed56 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -714,6 +714,31 @@ static void blk_account_io_merge(struct request *req)
part_stat_unlock();
}
}
+/*
+ * Two cases of handling DISCARD merge:
+ * If max_discard_segments > 1, the driver takes every bio
+ * as a range and send them to controller together. The ranges
+ * needn't to be contiguous.
+ * Otherwise, the bios/requests will be handled as same as
+ * others which should be contiguous.
+ */
+static inline bool blk_discard_mergable(struct request *req)
+{
+ if (req_op(req) == REQ_OP_DISCARD &&
+ queue_max_discard_segments(req->q) > 1)
+ return true;
+ return false;
+}
+
+enum elv_merge blk_try_req_merge(struct request *req, struct request *next)
+{
+ if (blk_discard_mergable(req))
+ return ELEVATOR_DISCARD_MERGE;
+ else if (blk_rq_pos(req) + blk_rq_sectors(req) == blk_rq_pos(next))
+ return ELEVATOR_BACK_MERGE;
+
+ return ELEVATOR_NO_MERGE;
+}
/*
* For non-mq, this has to be called with the request spinlock acquired.
@@ -731,12 +756,6 @@ static struct request *attempt_merge(struct request_queue *q,
if (req_op(req) != req_op(next))
return NULL;
- /*
- * not contiguous
- */
- if (blk_rq_pos(req) + blk_rq_sectors(req) != blk_rq_pos(next))
- return NULL;
-
if (rq_data_dir(req) != rq_data_dir(next)
|| req->rq_disk != next->rq_disk
|| req_no_special_merge(next))
@@ -760,11 +779,19 @@ static struct request *attempt_merge(struct request_queue *q,
* counts here. Handle DISCARDs separately, as they
* have separate settings.
*/
- if (req_op(req) == REQ_OP_DISCARD) {
+
+ switch (blk_try_req_merge(req, next)) {
+ case ELEVATOR_DISCARD_MERGE:
if (!req_attempt_discard_merge(q, req, next))
return NULL;
- } else if (!ll_merge_requests_fn(q, req, next))
+ break;
+ case ELEVATOR_BACK_MERGE:
+ if (!ll_merge_requests_fn(q, req, next))
+ return NULL;
+ break;
+ default:
return NULL;
+ }
/*
* If failfast settings disagree or any of the two is already
@@ -888,8 +915,7 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
enum elv_merge blk_try_merge(struct request *rq, struct bio *bio)
{
- if (req_op(rq) == REQ_OP_DISCARD &&
- queue_max_discard_segments(rq->q) > 1)
+ if (blk_discard_mergable(rq))
return ELEVATOR_DISCARD_MERGE;
else if (blk_rq_pos(rq) + blk_rq_sectors(rq) == bio->bi_iter.bi_sector)
return ELEVATOR_BACK_MERGE;
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 0641533597f1..844a454a7b3a 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -1007,8 +1007,6 @@ void blk_unregister_queue(struct gendisk *disk)
kobject_del(&q->kobj);
blk_trace_remove_sysfs(disk_to_dev(disk));
- rq_qos_exit(q);
-
mutex_lock(&q->sysfs_lock);
if (q->request_fn || (q->mq_ops && q->elevator))
elv_unregister_queue(q);
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 4bda70e8db48..db1a3a2ae006 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -2115,11 +2115,21 @@ static inline void throtl_update_latency_buckets(struct throtl_data *td)
}
#endif
+static void blk_throtl_assoc_bio(struct throtl_grp *tg, struct bio *bio)
+{
+#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
+ /* fallback to root_blkg if we fail to get a blkg ref */
+ if (bio->bi_css && (bio_associate_blkg(bio, tg_to_blkg(tg)) == -ENODEV))
+ bio_associate_blkg(bio, bio->bi_disk->queue->root_blkg);
+ bio_issue_init(&bio->bi_issue, bio_sectors(bio));
+#endif
+}
+
bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg,
struct bio *bio)
{
struct throtl_qnode *qn = NULL;
- struct throtl_grp *tg = blkg_to_tg(blkg);
+ struct throtl_grp *tg = blkg_to_tg(blkg ?: q->root_blkg);
struct throtl_service_queue *sq;
bool rw = bio_data_dir(bio);
bool throttled = false;
@@ -2138,6 +2148,7 @@ bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg,
if (unlikely(blk_queue_bypass(q)))
goto out_unlock;
+ blk_throtl_assoc_bio(tg, bio);
blk_throtl_update_idletime(tg);
sq = &tg->service_queue;
diff --git a/block/bounce.c b/block/bounce.c
index cf49fe02f65c..36869afc258c 100644
--- a/block/bounce.c
+++ b/block/bounce.c
@@ -276,9 +276,7 @@ static struct bio *bounce_clone_bio(struct bio *bio_src, gfp_t gfp_mask,
}
}
- bio_clone_blkg_association(bio, bio_src);
-
- blkcg_bio_issue_init(bio);
+ bio_clone_blkcg_association(bio, bio_src);
return bio;
}
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 6a3d87dd3c1a..ed41aa978c4a 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -3759,7 +3759,7 @@ static void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio)
uint64_t serial_nr;
rcu_read_lock();
- serial_nr = __bio_blkcg(bio)->css.serial_nr;
+ serial_nr = bio_blkcg(bio)->css.serial_nr;
rcu_read_unlock();
/*
@@ -3824,7 +3824,7 @@ cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct cfq_io_cq *cic,
struct cfq_group *cfqg;
rcu_read_lock();
- cfqg = cfq_lookup_cfqg(cfqd, __bio_blkcg(bio));
+ cfqg = cfq_lookup_cfqg(cfqd, bio_blkcg(bio));
if (!cfqg) {
cfqq = &cfqd->oom_cfqq;
goto out;
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index df8103dd40ac..c18586fccb6f 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -396,15 +396,14 @@ static struct brd_device *brd_alloc(int i)
disk->first_minor = i * max_part;
disk->fops = &brd_fops;
disk->private_data = brd;
- disk->queue = brd->brd_queue;
disk->flags = GENHD_FL_EXT_DEVT;
sprintf(disk->disk_name, "ram%d", i);
set_capacity(disk, rd_size * 2);
- disk->queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO;
+ brd->brd_queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO;
/* Tell the block layer that this is not a rotational device */
- blk_queue_flag_set(QUEUE_FLAG_NONROT, disk->queue);
- blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, disk->queue);
+ blk_queue_flag_set(QUEUE_FLAG_NONROT, brd->brd_queue);
+ blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, brd->brd_queue);
return brd;
@@ -436,6 +435,7 @@ static struct brd_device *brd_init_one(int i, bool *new)
brd = brd_alloc(i);
if (brd) {
+ brd->brd_disk->queue = brd->brd_queue;
add_disk(brd->brd_disk);
list_add_tail(&brd->brd_list, &brd_devices);
}
@@ -503,8 +503,14 @@ static int __init brd_init(void)
/* point of no return */
- list_for_each_entry(brd, &brd_devices, brd_list)
+ list_for_each_entry(brd, &brd_devices, brd_list) {
+ /*
+ * associate with queue just before adding disk for
+ * avoiding to mess up failure path
+ */
+ brd->brd_disk->queue = brd->brd_queue;
add_disk(brd->brd_disk);
+ }
blk_register_region(MKDEV(RAMDISK_MAJOR, 0), 1UL << MINORBITS,
THIS_MODULE, brd_probe, NULL, NULL);
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index e6273ae85246..cb0cc8685076 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -77,7 +77,6 @@
#include <linux/falloc.h>
#include <linux/uio.h>
#include <linux/ioprio.h>
-#include <linux/blk-cgroup.h>
#include "loop.h"
@@ -1760,8 +1759,8 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,
/* always use the first bio's css */
#ifdef CONFIG_BLK_CGROUP
- if (cmd->use_aio && rq->bio && rq->bio->bi_blkg) {
- cmd->css = &bio_blkcg(rq->bio)->css;
+ if (cmd->use_aio && rq->bio && rq->bio->bi_css) {
+ cmd->css = rq->bio->bi_css;
css_get(cmd->css);
} else
#endif
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index dfc8de6ce525..a7daa8acbab3 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -1942,8 +1942,8 @@ static int exec_drive_taskfile(struct driver_data *dd,
dev_warn(&dd->pdev->dev,
"data movement but "
"sect_count is 0\n");
- err = -EINVAL;
- goto abort;
+ err = -EINVAL;
+ goto abort;
}
}
}
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index f3fb5bb8c82a..ac1cffd2a09b 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -542,7 +542,7 @@ static void raid0_handle_discard(struct mddev *mddev, struct bio *bio)
!discard_bio)
continue;
bio_chain(discard_bio, bio);
- bio_clone_blkg_association(discard_bio, bio);
+ bio_clone_blkcg_association(discard_bio, bio);
if (mddev->gendisk)
trace_block_bio_remap(bdev_get_queue(rdev->bdev),
discard_bio, disk_devt(mddev->gendisk),
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index e52b9d3c0bd6..0b70c8bab045 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -1704,7 +1704,6 @@ __nvme_fc_init_request(struct nvme_fc_ctrl *ctrl,
op->fcp_req.rspaddr = &op->rsp_iu;
op->fcp_req.rsplen = sizeof(op->rsp_iu);
op->fcp_req.done = nvme_fc_fcpio_done;
- op->fcp_req.private = &op->fcp_req.first_sgl[SG_CHUNK_SIZE];
op->ctrl = ctrl;
op->queue = queue;
op->rq = rq;
@@ -1752,6 +1751,7 @@ nvme_fc_init_request(struct blk_mq_tag_set *set, struct request *rq,
if (res)
return res;
op->op.fcp_req.first_sgl = &op->sgl[0];
+ op->op.fcp_req.private = &op->priv[0];
return res;
}
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index f30031945ee4..c33bb201b884 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1663,6 +1663,9 @@ static void nvme_map_cmb(struct nvme_dev *dev)
struct pci_dev *pdev = to_pci_dev(dev->dev);
int bar;
+ if (dev->cmb_size)
+ return;
+
dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ);
if (!dev->cmbsz)
return;
@@ -2147,7 +2150,6 @@ static void nvme_pci_disable(struct nvme_dev *dev)
{
struct pci_dev *pdev = to_pci_dev(dev->dev);
- nvme_release_cmb(dev);
pci_free_irq_vectors(pdev);
if (pci_is_enabled(pdev)) {
@@ -2595,6 +2597,7 @@ static void nvme_remove(struct pci_dev *pdev)
nvme_stop_ctrl(&dev->ctrl);
nvme_remove_namespaces(&dev->ctrl);
nvme_dev_disable(dev, true);
+ nvme_release_cmb(dev);
nvme_free_host_mem(dev);
nvme_dev_remove_admin(dev);
nvme_free_queues(dev, 0);
diff --git a/fs/buffer.c b/fs/buffer.c
index d60d61e8ed7d..1286c2b95498 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3060,6 +3060,11 @@ static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
*/
bio = bio_alloc(GFP_NOIO, 1);
+ if (wbc) {
+ wbc_init_bio(wbc, bio);
+ wbc_account_io(wbc, bh->b_page, bh->b_size);
+ }
+
bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
bio_set_dev(bio, bh->b_bdev);
bio->bi_write_hint = write_hint;
@@ -3079,11 +3084,6 @@ static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
op_flags |= REQ_PRIO;
bio_set_op_attrs(bio, op, op_flags);
- if (wbc) {
- wbc_init_bio(wbc, bio);
- wbc_account_io(wbc, bh->b_page, bh->b_size);
- }
-
submit_bio(bio);
return 0;
}
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 2aa62d58d8dd..db7590178dfc 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -374,13 +374,13 @@ static int io_submit_init_bio(struct ext4_io_submit *io,
bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES);
if (!bio)
return -ENOMEM;
+ wbc_init_bio(io->io_wbc, bio);
bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
bio_set_dev(bio, bh->b_bdev);
bio->bi_end_io = ext4_end_bio;
bio->bi_private = ext4_get_io_end(io->io_end);
io->io_bio = bio;
io->io_next_block = bh->b_blocknr;
- wbc_init_bio(io->io_wbc, bio);
return 0;
}
diff --git a/include/linux/bio.h b/include/linux/bio.h
index b47c7f716731..056fb627edb3 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -503,31 +503,23 @@ do { \
disk_devt((bio)->bi_disk)
#if defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP)
-int bio_associate_blkg_from_page(struct bio *bio, struct page *page);
+int bio_associate_blkcg_from_page(struct bio *bio, struct page *page);
#else
-static inline int bio_associate_blkg_from_page(struct bio *bio,
- struct page *page) { return 0; }
+static inline int bio_associate_blkcg_from_page(struct bio *bio,
+ struct page *page) { return 0; }
#endif
#ifdef CONFIG_BLK_CGROUP
+int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css);
int bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg);
-int bio_associate_blkg_from_css(struct bio *bio,
- struct cgroup_subsys_state *css);
-int bio_associate_create_blkg(struct request_queue *q, struct bio *bio);
-int bio_reassociate_blkg(struct request_queue *q, struct bio *bio);
void bio_disassociate_task(struct bio *bio);
-void bio_clone_blkg_association(struct bio *dst, struct bio *src);
+void bio_clone_blkcg_association(struct bio *dst, struct bio *src);
#else /* CONFIG_BLK_CGROUP */
-static inline int bio_associate_blkg_from_css(struct bio *bio,
- struct cgroup_subsys_state *css)
-{ return 0; }
-static inline int bio_associate_create_blkg(struct request_queue *q,
- struct bio *bio) { return 0; }
-static inline int bio_reassociate_blkg(struct request_queue *q, struct bio *bio)
-{ return 0; }
+static inline int bio_associate_blkcg(struct bio *bio,
+ struct cgroup_subsys_state *blkcg_css) { return 0; }
static inline void bio_disassociate_task(struct bio *bio) { }
-static inline void bio_clone_blkg_association(struct bio *dst,
- struct bio *src) { }
+static inline void bio_clone_blkcg_association(struct bio *dst,
+ struct bio *src) { }
#endif /* CONFIG_BLK_CGROUP */
#ifdef CONFIG_HIGHMEM
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index 1e76ceebeb5d..6d766a19f2bb 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -126,7 +126,7 @@ struct blkcg_gq {
struct request_list rl;
/* reference count */
- struct percpu_ref refcnt;
+ atomic_t refcnt;
/* is this blkg online? protected by both blkcg and q locks */
bool online;
@@ -184,8 +184,6 @@ extern struct cgroup_subsys_state * const blkcg_root_css;
struct blkcg_gq *blkg_lookup_slowpath(struct blkcg *blkcg,
struct request_queue *q, bool update_hint);
-struct blkcg_gq *__blkg_lookup_create(struct blkcg *blkcg,
- struct request_queue *q);
struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg,
struct request_queue *q);
int blkcg_init_queue(struct request_queue *q);
@@ -232,59 +230,22 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
char *input, struct blkg_conf_ctx *ctx);
void blkg_conf_finish(struct blkg_conf_ctx *ctx);
-/**
- * blkcg_css - find the current css
- *
- * Find the css associated with either the kthread or the current task.
- * This may return a dying css, so it is up to the caller to use tryget logic
- * to confirm it is alive and well.
- */
-static inline struct cgroup_subsys_state *blkcg_css(void)
-{
- struct cgroup_subsys_state *css;
-
- css = kthread_blkcg();
- if (css)
- return css;
- return task_css(current, io_cgrp_id);
-}
static inline struct blkcg *css_to_blkcg(struct cgroup_subsys_state *css)
{
return css ? container_of(css, struct blkcg, css) : NULL;
}
-/**
- * __bio_blkcg - internal version of bio_blkcg for bfq and cfq
- *
- * DO NOT USE.
- * There is a flaw using this version of the function. In particular, this was
- * used in a broken paradigm where association was called on the given css. It
- * is possible though that the returned css from task_css() is in the process
- * of dying due to migration of the current task. So it is improper to assume
- * *_get() is going to succeed. Both BFQ and CFQ rely on this logic and will
- * take additional work to handle more gracefully.
- */
-static inline struct blkcg *__bio_blkcg(struct bio *bio)
-{
- if (bio && bio->bi_blkg)
- return bio->bi_blkg->blkcg;
- return css_to_blkcg(blkcg_css());
-}
-
-/**
- * bio_blkcg - grab the blkcg associated with a bio
- * @bio: target bio
- *
- * This returns the blkcg associated with a bio, NULL if not associated.
- * Callers are expected to either handle NULL or know association has been
- * done prior to calling this.
- */
static inline struct blkcg *bio_blkcg(struct bio *bio)
{
- if (bio && bio->bi_blkg)
- return bio->bi_blkg->blkcg;
- return NULL;
+ struct cgroup_subsys_state *css;
+
+ if (bio && bio->bi_css)
+ return css_to_blkcg(bio->bi_css);
+ css = kthread_blkcg();
+ if (css)
+ return css_to_blkcg(css);
+ return css_to_blkcg(task_css(current, io_cgrp_id));
}
static inline bool blk_cgroup_congested(void)
@@ -490,35 +451,26 @@ static inline int blkg_path(struct blkcg_gq *blkg, char *buf, int buflen)
*/
static inline void blkg_get(struct blkcg_gq *blkg)
{
- percpu_ref_get(&blkg->refcnt);
+ WARN_ON_ONCE(atomic_read(&blkg->refcnt) <= 0);
+ atomic_inc(&blkg->refcnt);
}
/**
- * blkg_tryget - try and get a blkg reference
+ * blkg_try_get - try and get a blkg reference
* @blkg: blkg to get
*
* This is for use when doing an RCU lookup of the blkg. We may be in the midst
* of freeing this blkg, so we can only use it if the refcnt is not zero.
*/
-static inline bool blkg_tryget(struct blkcg_gq *blkg)
+static inline struct blkcg_gq *blkg_try_get(struct blkcg_gq *blkg)
{
- return percpu_ref_tryget(&blkg->refcnt);
+ if (atomic_inc_not_zero(&blkg->refcnt))
+ return blkg;
+ return NULL;
}
-/**
- * blkg_tryget_closest - try and get a blkg ref on the closet blkg
- * @blkg: blkg to get
- *
- * This walks up the blkg tree to find the closest non-dying blkg and returns
- * the blkg that it did association with as it may not be the passed in blkg.
- */
-static inline struct blkcg_gq *blkg_tryget_closest(struct blkcg_gq *blkg)
-{
- while (!percpu_ref_tryget(&blkg->refcnt))
- blkg = blkg->parent;
- return blkg;
-}
+void __blkg_release_rcu(struct rcu_head *rcu);
/**
* blkg_put - put a blkg reference
@@ -526,7 +478,9 @@ static inline struct blkcg_gq *blkg_tryget_closest(struct blkcg_gq *blkg)
*/
static inline void blkg_put(struct blkcg_gq *blkg)
{
- percpu_ref_put(&blkg->refcnt);
+ WARN_ON_ONCE(atomic_read(&blkg->refcnt) <= 0);
+ if (atomic_dec_and_test(&blkg->refcnt))
+ call_rcu(&blkg->rcu_head, __blkg_release_rcu);
}
/**
@@ -579,36 +533,25 @@ static inline struct request_list *blk_get_rl(struct request_queue *q,
rcu_read_lock();
- if (bio && bio->bi_blkg) {
- blkcg = bio->bi_blkg->blkcg;
- if (blkcg == &blkcg_root)
- goto rl_use_root;
-
- blkg_get(bio->bi_blkg);
- rcu_read_unlock();
- return &bio->bi_blkg->rl;
- }
+ blkcg = bio_blkcg(bio);
- blkcg = css_to_blkcg(blkcg_css());
+ /* bypass blkg lookup and use @q->root_rl directly for root */
if (blkcg == &blkcg_root)
- goto rl_use_root;
+ goto root_rl;
+ /*
+ * Try to use blkg->rl. blkg lookup may fail under memory pressure
+ * or if either the blkcg or queue is going away. Fall back to
+ * root_rl in such cases.
+ */
blkg = blkg_lookup(blkcg, q);
if (unlikely(!blkg))
- blkg = __blkg_lookup_create(blkcg, q);
-
- if (blkg->blkcg == &blkcg_root || !blkg_tryget(blkg))
- goto rl_use_root;
+ goto root_rl;
+ blkg_get(blkg);
rcu_read_unlock();
return &blkg->rl;
-
- /*
- * Each blkg has its own request_list, however, the root blkcg
- * uses the request_queue's root_rl. This is to avoid most
- * overhead for the root blkcg.
- */
-rl_use_root:
+root_rl:
rcu_read_unlock();
return &q->root_rl;
}
@@ -854,26 +797,32 @@ static inline bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg
struct bio *bio) { return false; }
#endif
-
-static inline void blkcg_bio_issue_init(struct bio *bio)
-{
- bio_issue_init(&bio->bi_issue, bio_sectors(bio));
-}
-
static inline bool blkcg_bio_issue_check(struct request_queue *q,
struct bio *bio)
{
+ struct blkcg *blkcg;
struct blkcg_gq *blkg;
bool throtl = false;
rcu_read_lock();
+ blkcg = bio_blkcg(bio);
+
+ /* associate blkcg if bio hasn't attached one */
+ bio_associate_blkcg(bio, &blkcg->css);
- bio_associate_create_blkg(q, bio);
- blkg = bio->bi_blkg;
+ blkg = blkg_lookup(blkcg, q);
+ if (unlikely(!blkg)) {
+ spin_lock_irq(q->queue_lock);
+ blkg = blkg_lookup_create(blkcg, q);
+ if (IS_ERR(blkg))
+ blkg = NULL;
+ spin_unlock_irq(q->queue_lock);
+ }
throtl = blk_throtl_bio(q, blkg, bio);
if (!throtl) {
+ blkg = blkg ?: q->root_blkg;
/*
* If the bio is flagged with BIO_QUEUE_ENTERED it means this
* is a split bio and we would have already accounted for the
@@ -885,8 +834,6 @@ static inline bool blkcg_bio_issue_check(struct request_queue *q,
blkg_rwstat_add(&blkg->stat_ios, bio->bi_opf, 1);
}
- blkcg_bio_issue_init(bio);
-
rcu_read_unlock();
return !throtl;
}
@@ -983,7 +930,6 @@ static inline int blkcg_activate_policy(struct request_queue *q,
static inline void blkcg_deactivate_policy(struct request_queue *q,
const struct blkcg_policy *pol) { }
-static inline struct blkcg *__bio_blkcg(struct bio *bio) { return NULL; }
static inline struct blkcg *bio_blkcg(struct bio *bio) { return NULL; }
static inline struct blkg_policy_data *blkg_to_pd(struct blkcg_gq *blkg,
@@ -999,7 +945,6 @@ static inline void blk_put_rl(struct request_list *rl) { }
static inline void blk_rq_set_rl(struct request *rq, struct request_list *rl) { }
static inline struct request_list *blk_rq_rl(struct request *rq) { return &rq->q->root_rl; }
-static inline void blkcg_bio_issue_init(struct bio *bio) { }
static inline bool blkcg_bio_issue_check(struct request_queue *q,
struct bio *bio) { return true; }
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 093a818c5b68..1dcf652ba0aa 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -178,6 +178,7 @@ struct bio {
* release. Read comment on top of bio_associate_current().
*/
struct io_context *bi_ioc;
+ struct cgroup_subsys_state *bi_css;
struct blkcg_gq *bi_blkg;
struct bio_issue bi_issue;
#endif
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 9968332cceed..9d12757a65b0 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -93,8 +93,6 @@ extern struct css_set init_css_set;
bool css_has_online_children(struct cgroup_subsys_state *css);
struct cgroup_subsys_state *css_from_id(int id, struct cgroup_subsys *ss);
-struct cgroup_subsys_state *cgroup_e_css(struct cgroup *cgroup,
- struct cgroup_subsys *ss);
struct cgroup_subsys_state *cgroup_get_e_css(struct cgroup *cgroup,
struct cgroup_subsys *ss);
struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry,
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 738a0c24874f..fdfd04e348f6 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -246,8 +246,7 @@ static inline void wbc_attach_fdatawrite_inode(struct writeback_control *wbc,
*
* @bio is a part of the writeback in progress controlled by @wbc. Perform
* writeback specific initialization. This is used to apply the cgroup
- * writeback context. Must be called after the bio has been associated with
- * a device.
+ * writeback context.
*/
static inline void wbc_init_bio(struct writeback_control *wbc, struct bio *bio)
{
@@ -258,7 +257,7 @@ static inline void wbc_init_bio(struct writeback_control *wbc, struct bio *bio)
* regular writeback instead of writing things out itself.
*/
if (wbc->wb)
- bio_associate_blkg_from_css(bio, wbc->wb->blkcg_css);
+ bio_associate_blkcg(bio, wbc->wb->blkcg_css);
}
#else /* CONFIG_CGROUP_WRITEBACK */
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 8b79318810ad..6aaf5dd5383b 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -493,7 +493,7 @@ static struct cgroup_subsys_state *cgroup_tryget_css(struct cgroup *cgrp,
}
/**
- * cgroup_e_css_by_mask - obtain a cgroup's effective css for the specified ss
+ * cgroup_e_css - obtain a cgroup's effective css for the specified subsystem
* @cgrp: the cgroup of interest
* @ss: the subsystem of interest (%NULL returns @cgrp->self)
*
@@ -502,8 +502,8 @@ static struct cgroup_subsys_state *cgroup_tryget_css(struct cgroup *cgrp,
* enabled. If @ss is associated with the hierarchy @cgrp is on, this
* function is guaranteed to return non-NULL css.
*/
-static struct cgroup_subsys_state *cgroup_e_css_by_mask(struct cgroup *cgrp,
- struct cgroup_subsys *ss)
+static struct cgroup_subsys_state *cgroup_e_css(struct cgroup *cgrp,
+ struct cgroup_subsys *ss)
{
lockdep_assert_held(&cgroup_mutex);
@@ -524,35 +524,6 @@ static struct cgroup_subsys_state *cgroup_e_css_by_mask(struct cgroup *cgrp,
}
/**
- * cgroup_e_css - obtain a cgroup's effective css for the specified subsystem
- * @cgrp: the cgroup of interest
- * @ss: the subsystem of interest
- *
- * Find and get the effective css of @cgrp for @ss. The effective css is
- * defined as the matching css of the nearest ancestor including self which
- * has @ss enabled. If @ss is not mounted on the hierarchy @cgrp is on,
- * the root css is returned, so this function always returns a valid css.
- *
- * The returned css is not guaranteed to be online, and therefore it is the
- * callers responsiblity to tryget a reference for it.
- */
-struct cgroup_subsys_state *cgroup_e_css(struct cgroup *cgrp,
- struct cgroup_subsys *ss)
-{
- struct cgroup_subsys_state *css;
-
- do {
- css = cgroup_css(cgrp, ss);
-
- if (css)
- return css;
- cgrp = cgroup_parent(cgrp);
- } while (cgrp);
-
- return init_css_set.subsys[ss->id];
-}
-
-/**
* cgroup_get_e_css - get a cgroup's effective css for the specified subsystem
* @cgrp: the cgroup of interest
* @ss: the subsystem of interest
@@ -634,11 +605,10 @@ EXPORT_SYMBOL_GPL(of_css);
*
* Should be called under cgroup_[tree_]mutex.
*/
-#define for_each_e_css(css, ssid, cgrp) \
- for ((ssid) = 0; (ssid) < CGROUP_SUBSYS_COUNT; (ssid)++) \
- if (!((css) = cgroup_e_css_by_mask(cgrp, \
- cgroup_subsys[(ssid)]))) \
- ; \
+#define for_each_e_css(css, ssid, cgrp) \
+ for ((ssid) = 0; (ssid) < CGROUP_SUBSYS_COUNT; (ssid)++) \
+ if (!((css) = cgroup_e_css(cgrp, cgroup_subsys[(ssid)]))) \
+ ; \
else
/**
@@ -1037,7 +1007,7 @@ static struct css_set *find_existing_css_set(struct css_set *old_cset,
* @ss is in this hierarchy, so we want the
* effective css from @cgrp.
*/
- template[i] = cgroup_e_css_by_mask(cgrp, ss);
+ template[i] = cgroup_e_css(cgrp, ss);
} else {
/*
* @ss is not in this hierarchy, so we don't want
@@ -3054,7 +3024,7 @@ static int cgroup_apply_control(struct cgroup *cgrp)
return ret;
/*
- * At this point, cgroup_e_css_by_mask() results reflect the new csses
+ * At this point, cgroup_e_css() results reflect the new csses
* making the following cgroup_update_dfl_csses() properly update
* css associations of all tasks in the subtree.
*/
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index fac0ddf8a8e2..2868d85f1fb1 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -764,9 +764,9 @@ blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio)
if (!bt || !(blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP))
return NULL;
- if (!bio->bi_blkg)
+ if (!bio->bi_css)
return NULL;
- return cgroup_get_kernfs_id(bio_blkcg(bio)->css.cgroup);
+ return cgroup_get_kernfs_id(bio->bi_css->cgroup);
}
#else
static union kernfs_node_id *
diff --git a/mm/page_io.c b/mm/page_io.c
index 27b835728442..d4d1c89bcddd 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -339,7 +339,7 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
goto out;
}
bio->bi_opf = REQ_OP_WRITE | REQ_SWAP | wbc_to_write_flags(wbc);
- bio_associate_blkg_from_page(bio, page);
+ bio_associate_blkcg_from_page(bio, page);
count_swpout_vm_event(page);
set_page_writeback(page);
unlock_page(page);