diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2009-02-02 09:48:52 +1100 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2009-02-02 09:48:52 +1100 |
| commit | 44f8676235ead36cb101c15d43b3624e61eaa7e1 (patch) | |
| tree | 5e0e8158e1204ece4c5cbedc40b0d5d5b3594ff5 /drivers/md | |
| parent | bb79129f58bc586998c93f93b45351080141e275 (diff) | |
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 this fails to respect BIO_MAX_PAGES so fix this.
This was the likely cause of:
https://bugzilla.redhat.com/show_bug.cgi?id=173153
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-io.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c index a34338567a2a..64dbd9765be1 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; |