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for-linus-20190628

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Merge tag 'for-linus-20190628' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "Just two small fixes.

  One from Paolo, fixing a silly mistake in BFQ. The other one is from
  me, ensuring that we have ->file cleared in the io_uring request a bit
  earlier. That avoids a use-before-free, if we encounter an error
  before ->file is assigned"

* tag 'for-linus-20190628' of git://git.kernel.dk/linux-block:
  block, bfq: fix operator in BFQQ_TOTALLY_SEEKY
  io_uring: ensure req->file is cleared on allocation
This commit is contained in:
Linus Torvalds 2019-06-29 16:58:35 +08:00
commit 9dda12b6fa
2 changed files with 3 additions and 4 deletions
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2
block/bfq-iosched.c
View File

@ -240,7 +240,7 @@ static struct kmem_cache *bfq_pool;
* containing only random (seeky) I/O are prevented from being tagged
* as soft real-time.
*/
#define BFQQ_TOTALLY_SEEKY(bfqq) (bfqq->seek_history & -1)
#define BFQQ_TOTALLY_SEEKY(bfqq) (bfqq->seek_history == -1)
/* Min number of samples required to perform peak-rate update */
#define BFQ_RATE_MIN_SAMPLES 32

5
fs/io_uring.c
View File

@ -579,6 +579,7 @@ static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx,
state->cur_req++;
}
req->file = NULL;
req->ctx = ctx;
req->flags = 0;
/* one is dropped after submission, the other at completion */
@ -1801,10 +1802,8 @@ static int io_req_set_file(struct io_ring_ctx *ctx, const struct sqe_submit *s,
req->sequence = ctx->cached_sq_head - 1;
}
if (!io_op_needs_file(s->sqe)) {
req->file = NULL;
if (!io_op_needs_file(s->sqe))
return 0;
}
if (flags & IOSQE_FIXED_FILE) {
if (unlikely(!ctx->user_files ||