nvmet: fix building bvec from sg list

There are two mistakes for building bvec from sg list for file
backed ns:

- use request data length to compute number of io vector, this way
doesn't consider sg->offset, and the result may be smaller than required
io vectors

- bvec->bv_len isn't capped by sg->length

This patch fixes this issue by building bvec from sg directly, given
the whole IO stack is ready for multi-page bvec.

Reported-by: Yi Zhang <yi.zhang@redhat.com>
Fixes: 3a85a5de29ea ("nvme-loop: add a NVMe loopback host driver")

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c
index 3e43212..bc6ebb5 100644 (file)
--- a/drivers/nvme/target/io-cmd-file.c
+++ b/drivers/nvme/target/io-cmd-file.c
@@ -75,11 +75,11 @@ err:
        return ret;
 }
 
-static void nvmet_file_init_bvec(struct bio_vec *bv, struct sg_page_iter *iter)
+static void nvmet_file_init_bvec(struct bio_vec *bv, struct scatterlist *sg)
 {
-       bv->bv_page = sg_page_iter_page(iter);
-       bv->bv_offset = iter->sg->offset;
-       bv->bv_len = PAGE_SIZE - iter->sg->offset;
+       bv->bv_page = sg_page(sg);
+       bv->bv_offset = sg->offset;
+       bv->bv_len = sg->length;
 }
 
 static ssize_t nvmet_file_submit_bvec(struct nvmet_req *req, loff_t pos,
@@ -128,14 +128,14 @@ static void nvmet_file_io_done(struct kiocb *iocb, long ret, long ret2)
 
 static bool nvmet_file_execute_io(struct nvmet_req *req, int ki_flags)
 {
-       ssize_t nr_bvec = DIV_ROUND_UP(req->data_len, PAGE_SIZE);
-       struct sg_page_iter sg_pg_iter;
+       ssize_t nr_bvec = req->sg_cnt;
        unsigned long bv_cnt = 0;
        bool is_sync = false;
        size_t len = 0, total_len = 0;
        ssize_t ret = 0;
        loff_t pos;
-
+       int i;
+       struct scatterlist *sg;
 
        if (req->f.mpool_alloc && nr_bvec > NVMET_MAX_MPOOL_BVEC)
                is_sync = true;
@@ -147,8 +147,8 @@ static bool nvmet_file_execute_io(struct nvmet_req *req, int ki_flags)
        }
 
        memset(&req->f.iocb, 0, sizeof(struct kiocb));
-       for_each_sg_page(req->sg, &sg_pg_iter, req->sg_cnt, 0) {
-               nvmet_file_init_bvec(&req->f.bvec[bv_cnt], &sg_pg_iter);
+       for_each_sg(req->sg, sg, req->sg_cnt, i) {
+               nvmet_file_init_bvec(&req->f.bvec[bv_cnt], sg);
                len += req->f.bvec[bv_cnt].bv_len;
                total_len += req->f.bvec[bv_cnt].bv_len;
                bv_cnt++;
@@ -225,7 +225,7 @@ static void nvmet_file_submit_buffered_io(struct nvmet_req *req)
 
 static void nvmet_file_execute_rw(struct nvmet_req *req)
 {
-       ssize_t nr_bvec = DIV_ROUND_UP(req->data_len, PAGE_SIZE);
+       ssize_t nr_bvec = req->sg_cnt;
 
        if (!req->sg_cnt || !nr_bvec) {
                nvmet_req_complete(req, 0);