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Subject[PATCH v5 0/7] block: fix blktrace debugfs use after free
On this v5 I've split up the first patch into 3, one for comments,
another for context / might_sleep() updates, and the last the big
revert back to synchronous request_queue removal. I didn't update
the context for the put / decrements for gendisk & request_queue
as they would be updated in the next patch.

Since the first 3 patches are a reflection of the original one, I've
left the Reviewed-by's collected in place.

I've changed the kzalloc() / snprintf() to just kasprintf() as requested
by Bart. Since it was not clear that we don't have the bdev on
do_blk_trace_setup() for the patch titled "blktrace: break out of
blktrace setup on concurrent calls", I've added a comment so that
someone doesn't later try to add a dev_printk() or the like.

I've also addressed a compilation issue with debugfs disabled reported
by 0-day on the patch titled "blktrace: fix debugfs use after free". It
was missing a "static inline" on a function. I've also moved the new
declarations underneath the "#ifdef CONFIG_BLOCK" on include/linux/genhd.h,
I previously had them outside of this block.

I've left in place the scsi-generic blktrace suppport given I didn't receive any
feedback to kill it. This ensures this works as it used to.

Since these are minor changes I've given this a spin with break-blktrace
tests I have written and also ran blktrace with a scsi-generic media
changer. Both sg0 (the controller) and sg1 worked as expected.

These changes are based on linux-next tag next-20200515, and can also be
found on my git tree:

Luis Chamberlain (7):
block: add docs for gendisk / request_queue refcount helpers
block: clarify context for gendisk / request_queue refcount increment
block: revert back to synchronous request_queue removal
block: move main block debugfs initialization to its own file
blktrace: fix debugfs use after free
blktrace: break out of blktrace setup on concurrent calls
loop: be paranoid on exit and prevent new additions / removals

block/Makefile | 10 +-
block/blk-core.c | 32 ++++--
block/blk-debugfs.c | 197 +++++++++++++++++++++++++++++++++++
block/blk-mq-debugfs.c | 5 -
block/blk-sysfs.c | 46 ++++----
block/blk.h | 24 +++++
block/bsg.c | 2 +
block/genhd.c | 73 ++++++++++++-
block/partitions/core.c | 9 ++
drivers/block/loop.c | 4 +
drivers/scsi/ch.c | 1 +
drivers/scsi/sg.c | 75 +++++++++++++
drivers/scsi/st.c | 2 +
include/linux/blkdev.h | 6 +-
include/linux/blktrace_api.h | 1 -
include/linux/genhd.h | 69 ++++++++++++
kernel/trace/blktrace.c | 37 +++++--
17 files changed, 545 insertions(+), 48 deletions(-)
create mode 100644 block/blk-debugfs.c


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