Currently iomap can build extremely large bios (I've seen sizes
up to 480MB). Limit this to a lower bound so that the soon to
be added per-ioend integrity buffer doesn't go beyond what the
page allocator can support.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/iomap/buffered-io.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 06990e012884..71bb676d4998 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -456,6 +456,7 @@ static loff_t iomap_readpage_iter(const struct iomap_iter *iter,
sector = iomap_sector(iomap, pos);
if (!ctx->bio ||
bio_end_sector(ctx->bio) != sector ||
+ ctx->bio->bi_iter.bi_size > SZ_128M ||
!bio_add_folio(ctx->bio, folio, plen, poff)) {
if (ctx->bio)
iomap_read_submit_bio(iter, ctx);
@@ -1674,6 +1675,8 @@ static struct iomap_ioend *iomap_alloc_ioend(struct iomap_writepage_ctx *wpc,
static bool iomap_can_add_to_ioend(struct iomap_writepage_ctx *wpc, loff_t pos,
u16 ioend_flags)
{
+ if (wpc->ioend->io_bio.bi_iter.bi_size > SZ_128M)
+ return false;
if (ioend_flags & IOMAP_IOEND_BOUNDARY)
return false;
if ((ioend_flags & IOMAP_IOEND_NOMERGE_FLAGS) !=
--
2.45.2
