Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / drivers / md / dm-log-writes.c

diff --git a/kernel/drivers/md/dm-log-writes.c b/kernel/drivers/md/dm-log-writes.c
index 624589d..c8b513e 100644 (file)
--- a/kernel/drivers/md/dm-log-writes.c
+++ b/kernel/drivers/md/dm-log-writes.c
@@ -258,12 +258,12 @@ static int log_one_block(struct log_writes_c *lc,
                goto out;
        sector++;
 
-       bio = bio_alloc(GFP_KERNEL, block->vec_cnt);
+       atomic_inc(&lc->io_blocks);
+       bio = bio_alloc(GFP_KERNEL, min(block->vec_cnt, BIO_MAX_PAGES));
        if (!bio) {
                DMERR("Couldn't alloc log bio");
                goto error;
        }
-       atomic_inc(&lc->io_blocks);
        bio->bi_iter.bi_size = 0;
        bio->bi_iter.bi_sector = sector;
        bio->bi_bdev = lc->logdev->bdev;
@@ -280,7 +280,7 @@ static int log_one_block(struct log_writes_c *lc,
                if (ret != block->vecs[i].bv_len) {
                        atomic_inc(&lc->io_blocks);
                        submit_bio(WRITE, bio);
-                       bio = bio_alloc(GFP_KERNEL, block->vec_cnt - i);
+                       bio = bio_alloc(GFP_KERNEL, min(block->vec_cnt - i, BIO_MAX_PAGES));
                        if (!bio) {
                                DMERR("Couldn't alloc log bio");
                                goto error;
@@ -456,9 +456,9 @@ static int log_writes_ctr(struct dm_target *ti, unsigned int argc, char **argv)
                goto bad;
        }
 
-       ret = -EINVAL;
        lc->log_kthread = kthread_run(log_writes_kthread, lc, "log-write");
-       if (!lc->log_kthread) {
+       if (IS_ERR(lc->log_kthread)) {
+               ret = PTR_ERR(lc->log_kthread);
                ti->error = "Couldn't alloc kthread";
                dm_put_device(ti, lc->dev);
                dm_put_device(ti, lc->logdev);