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authorChristoph Hellwig <hch@infradead.org>2012-02-02 16:51:24 -0500
committerNicholas Bellinger <nab@linux-iscsi.org>2012-02-07 06:48:46 +0000
commit5c55125f4794f4e77574fc09839cb47b0eb45b06 (patch)
tree2e35bfcfe983dee5d5afbf0437dd3ff5f9a4938a
parent3011684c0b0b77b0f88113ef1c15b18befc6734a (diff)
iblock: fix handling of large requests
Requesting to many bvecs upsets bio_alloc_bioset, so limit the number we ask for to the amount it can handle. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
-rw-r--r--drivers/target/target_core_iblock.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index d43d5eb5ed2..8572eae62da 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -488,6 +488,13 @@ iblock_get_bio(struct se_task *task, sector_t lba, u32 sg_num)
struct iblock_req *ib_req = IBLOCK_REQ(task);
struct bio *bio;
+ /*
+ * Only allocate as many vector entries as the bio code allows us to,
+ * we'll loop later on until we have handled the whole request.
+ */
+ if (sg_num > BIO_MAX_PAGES)
+ sg_num = BIO_MAX_PAGES;
+
bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set);
if (!bio) {
pr_err("Unable to allocate memory for bio\n");