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scst: some more debug tracing on the pass-through path

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@6826 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2016-03-10 05:25:55 +00:00
parent c12cdbf860
commit 740ad417db
1 changed files with 11 additions and 0 deletions
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11
scst/src/scst_lib.c
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@@ -7743,6 +7743,9 @@ static struct request *__blk_map_kern_sg(struct request_queue *q,
(PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
BIO_MAX_PAGES);
TRACE_DBG("max_nr_vecs %d, nents %d, reading %d", max_nr_vecs,
nents, reading);
need_new_bio = true;
tot_len = 0;
bios = 0;
@@ -7764,6 +7767,10 @@ static struct request *__blk_map_kern_sg(struct request_queue *q,
l = 0;
else
l = len;
TRACE_DBG("i %d, len %zd, tot_len %zd, l %zd, offset %zd",
i, len, tot_len, l, offset);
if (((sg->offset | l) & queue_dma_alignment(q)) ||
(page_addr && object_is_on_stack(page_addr + sg->offset))) {
rq = ERR_PTR(-EINVAL);
@@ -7798,6 +7805,8 @@ static struct request *__blk_map_kern_sg(struct request_queue *q,
bio->bi_private = bw;
bio->bi_end_io = blk_bio_map_kern_endio;
TRACE_DBG("new bio %p, bios %d", bio, bios);
if (hbio == NULL)
hbio = bio;
else
@@ -7807,6 +7816,8 @@ static struct request *__blk_map_kern_sg(struct request_queue *q,
bytes = min_t(size_t, len, PAGE_SIZE - offset);
TRACE_DBG("len %zd, bytes %zd, offset %zd", len, bytes, offset);
rc = bio_add_pc_page(q, bio, page, bytes, offset);
if (rc < bytes) {
if (unlikely(need_new_bio || rc < 0)) {