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authorMikulas Patocka <mpatocka@redhat.com>2009-03-16 17:44:30 +0000
committerAlasdair G Kergon <agk@redhat.com>2009-03-16 17:44:30 +0000
commitd659e6cc98766a1a61d6bdd283f95d149abd7719 (patch)
tree6bed5b474d50d345a2d16562cf521d7bfa7243b8 /drivers
parentf80a557008462a0a4adef25407f1872e793d8dd5 (diff)
downloadlinux-d659e6cc98766a1a61d6bdd283f95d149abd7719.tar.bz2
dm io: respect BIO_MAX_PAGES limit
dm-io calls bio_get_nr_vecs to get the maximum number of pages to use for a given device. It allocates one additional bio_vec to use internally but failed to respect BIO_MAX_PAGES, so fix this. This was the likely cause of: https://bugzilla.redhat.com/show_bug.cgi?id=173153 Cc: stable@kernel.org Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/dm-io.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index f14813be4eff..36e2b5e46a6b 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -292,6 +292,8 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
(PAGE_SIZE >> SECTOR_SHIFT));
num_bvecs = 1 + min_t(int, bio_get_nr_vecs(where->bdev),
num_bvecs);
+ if (unlikely(num_bvecs > BIO_MAX_PAGES))
+ num_bvecs = BIO_MAX_PAGES;
bio = bio_alloc_bioset(GFP_NOIO, num_bvecs, io->client->bios);
bio->bi_sector = where->sector + (where->count - remaining);
bio->bi_bdev = where->bdev;