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bcachefs: Limit bios in writepages path to 256M

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This works around a bug where bio_full() doesn't check for
bio->bi_iter.bi_size overflowing - and, we don't really want to build
bios that are that big anyways.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2019-10-20 00:22:03 -04:00 committed by Kent Overstreet
parent 71603f1ffe
commit a94407434b
1 changed files with 1 additions and 0 deletions
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1
fs/bcachefs/fs-io.c
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@ -1151,6 +1151,7 @@ static int __bch2_writepage(struct folio *folio,
if (w->io &&
(w->io->op.res.nr_replicas != nr_replicas_this_write ||
bio_full(&w->io->op.wbio.bio, PAGE_SIZE) ||
w->io->op.wbio.bio.bi_iter.bi_size >= (256U << 20) ||
bio_end_sector(&w->io->op.wbio.bio) != sector))
bch2_writepage_do_io(w);