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authorLinus Torvalds <torvalds@linux-foundation.org>2020-05-10 11:16:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-05-10 11:16:07 -0700
commit0a85ed6e7fce8075bb3090f8eac05ca1000f5969 (patch)
treea3dea96c1d9c827b223e1238b9ed9aecdae6502c /mm
parente99332e7b4cda6e60f5b5916cf9943a79dbef902 (diff)
parent59c7c3caaaf8750df4ec3255082f15eb4e371514 (diff)
Merge tag 'block-5.7-2020-05-09' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe: - a small series fixing a use-after-free of bdi name (Christoph,Yufen) - NVMe fix for a regression with the smaller CQ update (Alexey) - NVMe fix for a hang at namespace scanning error recovery (Sagi) - fix race with blk-iocost iocg->abs_vdebt updates (Tejun) * tag 'block-5.7-2020-05-09' of git://git.kernel.dk/linux-block: nvme: fix possible hang when ns scanning fails during error recovery nvme-pci: fix "slimmer CQ head update" bdi: add a ->dev_name field to struct backing_dev_info bdi: use bdi_dev_name() to get device name bdi: move bdi_dev_name out of line vboxsf: don't use the source name in the bdi name iocost: protect iocg->abs_vdebt with iocg->waitq.lock
Diffstat (limited to 'mm')
-rw-r--r--mm/backing-dev.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index c81b4f3a7268..efc5b83acd2d 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -21,7 +21,7 @@ struct backing_dev_info noop_backing_dev_info = {
EXPORT_SYMBOL_GPL(noop_backing_dev_info);
static struct class *bdi_class;
-const char *bdi_unknown_name = "(unknown)";
+static const char *bdi_unknown_name = "(unknown)";
/*
* bdi_lock protects bdi_tree and updates to bdi_list. bdi_list has RCU
@@ -938,7 +938,8 @@ int bdi_register_va(struct backing_dev_info *bdi, const char *fmt, va_list args)
if (bdi->dev) /* The driver needs to use separate queues per device */
return 0;
- dev = device_create_vargs(bdi_class, NULL, MKDEV(0, 0), bdi, fmt, args);
+ vsnprintf(bdi->dev_name, sizeof(bdi->dev_name), fmt, args);
+ dev = device_create(bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name);
if (IS_ERR(dev))
return PTR_ERR(dev);
@@ -1043,6 +1044,14 @@ void bdi_put(struct backing_dev_info *bdi)
}
EXPORT_SYMBOL(bdi_put);
+const char *bdi_dev_name(struct backing_dev_info *bdi)
+{
+ if (!bdi || !bdi->dev)
+ return bdi_unknown_name;
+ return bdi->dev_name;
+}
+EXPORT_SYMBOL_GPL(bdi_dev_name);
+
static wait_queue_head_t congestion_wqh[2] = {
__WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[0]),
__WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[1])