From: Kent Overstreet <kent.overstreet@gmail.com>
Date: Sun, 20 Oct 2019 04:22:03 +0000 (-0400)
Subject: bcachefs: Limit bios in writepages path to 256M
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a94407434b7a3b577a7605f0bd999d98acad6d23;p=linux.git

bcachefs: Limit bios in writepages path to 256M

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>
---

diff --git a/fs/bcachefs/fs-io.c b/fs/bcachefs/fs-io.c
index 9914f6ee2aa25..a3fb603837250 100644
--- a/fs/bcachefs/fs-io.c
+++ b/fs/bcachefs/fs-io.c
@@ -1151,6 +1151,7 @@ do_io:
 		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);