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author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-03-09 15:53:25 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-03-09 15:53:25 -0800 |
commit | 34bbce9e344b47e8871273409632f525973afad4 (patch) | |
tree | 69bb1c6f4b0d49f5122114d2bc45f4c06c22505d /mm | |
parent | bb61ce54e8986ea18f7eb13cfa4a6fa8eb311bbd (diff) | |
parent | 672a2c87c83649fb0167202342ce85af9a3b4f1c (diff) | |
download | linux-34bbce9e344b47e8871273409632f525973afad4.tar.gz linux-34bbce9e344b47e8871273409632f525973afad4.tar.xz |
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe:
"Sending this a bit sooner than I otherwise would have, as a fix in the
merge window had some unfortunate issues and side effects for some
folks.
This contains:
- Fixes from Jan for the bdi registration/unregistration. These have
been tested by the various parties reporting issues, and should be
solid at this point.
- Also from Jan, fix for axonram gendisk registration.
- A stable fix for zram from Johannes.
- A small series from Ming, fixing up some long standing issues with
blk-mq hardware queue kobject initialization and registration.
- A fix for sed opal from Jon, fixing a nonsensical range check and
some set-but-not-used variables.
- A fix from Neil for a long standing deadlock issue for stacking
device drivers. With this in place, dm/md don't have to work around
the issue anymore, and can be properly fixed up"
* 'for-linus' of git://git.kernel.dk/linux-block:
axonram: Fix gendisk handling
blk: improve order of bio handling in generic_make_request()
Revert "scsi, block: fix duplicate bdi name registration crashes"
block: Make del_gendisk() safer for disks without queues
bdi: Fix use-after-free in wb_congested_put()
block: Allow bdi re-registration
block/sed: Fix opal user range check and unused variables
zram: set physical queue limits to avoid array out of bounds accesses
blk-mq: free hctx->cpumask in release handler of hctx's kobject
blk-mq: make lifetime consistent between hctx and its kobject
blk-mq: make lifetime consitent between q/ctx and its kobject
blk-mq: initialize mq kobjects in blk_mq_init_allocated_queue()
Diffstat (limited to 'mm')
-rw-r--r-- | mm/backing-dev.c | 43 |
1 files changed, 28 insertions, 15 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 6d861d090e9f..c6f2a37028c2 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -683,33 +683,26 @@ static int cgwb_bdi_init(struct backing_dev_info *bdi) static void cgwb_bdi_destroy(struct backing_dev_info *bdi) { struct radix_tree_iter iter; - struct rb_node *rbn; void **slot; WARN_ON(test_bit(WB_registered, &bdi->wb.state)); spin_lock_irq(&cgwb_lock); - radix_tree_for_each_slot(slot, &bdi->cgwb_tree, &iter, 0) cgwb_kill(*slot); - - 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); /* - * All cgwb's and their congested states must be shutdown and - * released before returning. Drain the usage counter to wait for - * all cgwb's and cgwb_congested's ever created on @bdi. + * All cgwb's must be shutdown and released before returning. Drain + * the usage counter to wait for all cgwb's ever created on @bdi. */ atomic_dec(&bdi->usage_cnt); wait_event(cgwb_release_wait, !atomic_read(&bdi->usage_cnt)); + /* + * Grab back our reference so that we hold it when @bdi gets + * re-registered. + */ + atomic_inc(&bdi->usage_cnt); } /** @@ -749,6 +742,21 @@ 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); +} + #else /* CONFIG_CGROUP_WRITEBACK */ static int cgwb_bdi_init(struct backing_dev_info *bdi) @@ -769,7 +777,9 @@ static int cgwb_bdi_init(struct backing_dev_info *bdi) return 0; } -static void cgwb_bdi_destroy(struct backing_dev_info *bdi) +static void cgwb_bdi_destroy(struct backing_dev_info *bdi) { } + +static void cgwb_bdi_exit(struct backing_dev_info *bdi) { wb_congested_put(bdi->wb_congested); } @@ -857,6 +867,8 @@ int bdi_register_owner(struct backing_dev_info *bdi, struct device *owner) MINOR(owner->devt)); if (rc) return rc; + /* Leaking owner reference... */ + WARN_ON(bdi->owner); bdi->owner = owner; get_device(owner); return 0; @@ -898,6 +910,7 @@ static void bdi_exit(struct backing_dev_info *bdi) { WARN_ON_ONCE(bdi->dev); wb_exit(&bdi->wb); + cgwb_bdi_exit(bdi); } static void release_bdi(struct kref *ref) |