Factor a helper function ublk_copy_user_bvec() out of ublk_copy_user_pages(). It will be used for copying integrity data too.
Signed-off-by: Caleb Sander Mateos csander@purestorage.com --- drivers/block/ublk_drv.c | 52 +++++++++++++++++++++++----------------- 1 file changed, 30 insertions(+), 22 deletions(-)
diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 2b0a9720921d..2ce9afdecc15 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -1000,10 +1000,39 @@ static const struct block_device_operations ub_fops = { .open = ublk_open, .free_disk = ublk_free_disk, .report_zones = ublk_report_zones, };
+static bool ublk_copy_user_bvec(const struct bio_vec *bv, unsigned *offset, + struct iov_iter *uiter, int dir, size_t *done) +{ + unsigned len; + void *bv_buf; + size_t copied; + + if (*offset >= bv->bv_len) { + *offset -= bv->bv_len; + return true; + } + + len = bv->bv_len - *offset; + bv_buf = kmap_local_page(bv->bv_page) + bv->bv_offset + *offset; + if (dir == ITER_DEST) + copied = copy_to_iter(bv_buf, len, uiter); + else + copied = copy_from_iter(bv_buf, len, uiter); + + kunmap_local(bv_buf); + + *done += copied; + if (copied < len) + return false; + + *offset = 0; + return true; +} + /* * Copy data between request pages and io_iter, and 'offset' * is the start point of linear offset of request. */ static size_t ublk_copy_user_pages(const struct request *req, @@ -1012,33 +1041,12 @@ static size_t ublk_copy_user_pages(const struct request *req, struct req_iterator iter; struct bio_vec bv; size_t done = 0;
rq_for_each_segment(bv, req, iter) { - unsigned len; - void *bv_buf; - size_t copied; - - if (offset >= bv.bv_len) { - offset -= bv.bv_len; - continue; - } - - len = bv.bv_len - offset; - bv_buf = kmap_local_page(bv.bv_page) + bv.bv_offset + offset; - if (dir == ITER_DEST) - copied = copy_to_iter(bv_buf, len, uiter); - else - copied = copy_from_iter(bv_buf, len, uiter); - - kunmap_local(bv_buf); - - done += copied; - if (copied < len) + if (!ublk_copy_user_bvec(&bv, &offset, uiter, dir, &done)) break; - - offset = 0; } return done; }
static inline bool ublk_need_map_req(const struct request *req)