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block: add a BUILD_BUG_ON() for adding more bio flags than we have space

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We have BIO_FLAG_LAST in the enum for bio specific flags, but it's
not used to check that we're not exceeding the size of them. Add
such a check.

Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2023-01-09 10:45:56 -07:00
parent c9c77418a9
commit a3df2e456c
1 changed files with 2 additions and 0 deletions
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block/bio.c
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@ -1792,6 +1792,8 @@ static int __init init_bio(void)
{
int i;
BUILD_BUG_ON(BIO_FLAG_LAST > 8 * sizeof_field(struct bio, bi_flags));
bio_integrity_init();
for (i = 0; i < ARRAY_SIZE(bvec_slabs); i++) {