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| author |   Ming Lei <ming.lei@redhat.com> | 2019-01-22 16:20:17 +0800 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2019-01-22 10:24:08 -0700 |
| commit | 698cef173983b086977e633e46476e0f925ca01e (patch) | |
| tree | 57caf7c7c9ce231ce193c53ae663ac49bbe999c6 /mm/backing-dev.c | |
| parent | direct-io: allow direct writes to empty inodes (diff) | |
| download | linux-dev-698cef173983b086977e633e46476e0f925ca01e.tar.xz linux-dev-698cef173983b086977e633e46476e0f925ca01e.zip | |
block: cover another queue enter recursion via BIO_QUEUE_ENTERED
Except for blk_queue_split(), bio_split() is used for splitting bio too,
then the remained bio is often resubmit to queue via generic_make_request().
So the same queue enter recursion exits in this case too. Unfortunatley
commit cd4a4ae4683dc2 doesn't help this case.
This patch covers the above case by setting BIO_QUEUE_ENTERED before calling
q->make_request_fn.
In theory the per-bio flag is used to simulate one stack variable, it is
just fine to clear it after q->make_request_fn is returned. Especially
the same bio can't be submitted from another context.
Fixes: cd4a4ae4683dc2 ("block: don't use blocking queue entered for recursive bio submits")
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: NeilBrown <neilb@suse.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions