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| author | Johannes Thumshirn <jthumshirn@suse.de> | 2019-04-03 11:15:19 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-04-04 17:30:37 +0200 |
| commit | 2b24e6f63ac9e817630424c6d8f008256348dfc4 (patch) | |
| tree | 04e523e6f47a8d5b251f86ad827e2ab3ee8c7640 /block | |
| parent | md: batch flush requests. (diff) | |
| download | linux-2b24e6f63ac9e817630424c6d8f008256348dfc4.tar.xz linux-2b24e6f63ac9e817630424c6d8f008256348dfc4.zip | |
block: bio: ensure newly added bio flags don't override BVEC_POOL_IDX
With the introduction of BIO_NO_PAGE_REF we've used up all available bits
in bio::bi_flags.
Convert the defines of the flags to an enum and add a BUILD_BUG_ON() call
to make sure no-one adds a new one and thus overrides the BVEC_POOL_IDX
causing crashes.
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/bio.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/bio.c b/block/bio.c index 8d516d508ae3..c2592c5d70b9 100644 --- a/block/bio.c +++ b/block/bio.c @@ -2218,6 +2218,9 @@ static int __init init_bio(void) bio_slab_nr = 0; bio_slabs = kcalloc(bio_slab_max, sizeof(struct bio_slab), GFP_KERNEL); + + BUILD_BUG_ON(BIO_FLAG_LAST > BVEC_POOL_OFFSET); + if (!bio_slabs) panic("bio: can't allocate bios\n"); |