Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

# gpg: Signature made Mon 03 Nov 2014 11:50:53 GMT using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>"

* remotes/stefanha/tags/block-pull-request: (53 commits)
  block: declare blockjobs and dataplane friends!
  block: let commit blockjob run in BDS AioContext
  block: let mirror blockjob run in BDS AioContext
  block: let stream blockjob run in BDS AioContext
  block: let backup blockjob run in BDS AioContext
  block: add bdrv_drain()
  blockjob: add block_job_defer_to_main_loop()
  blockdev: add note that block_job_cb() must be thread-safe
  blockdev: acquire AioContext in blockdev_mark_auto_del()
  blockdev: acquire AioContext in do_qmp_query_block_jobs_one()
  block: acquire AioContext in generic blockjob QMP commands
  iotests: Expand test 061
  block/qcow2: Simplify shared L2 handling in amend
  block/qcow2: Make get_refcount() global
  block/qcow2: Implement status CB for amend
  qemu-img: Fix insignificant memleak
  qemu-img: Add progress output for amend
  block: Add status callback to bdrv_amend_options()
  block: qemu-iotest 107 supports NFS
  iotests: Add test for qcow2's bdrv_make_empty
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 37 insertions, 12 deletions

diff --git a/block/iscsi.c b/block/iscsi.c
index 3485d622ec..ed375fc30e 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -362,6 +362,12 @@ static int coroutine_fn iscsi_co_writev(BlockDriverState *bs,
         return -EINVAL;
     }
 
+    if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) {
+        error_report("iSCSI Error: Write of %d sectors exceeds max_xfer_len "
+                     "of %d sectors", nb_sectors, bs->bl.max_transfer_length);
+        return -EINVAL;
+    }
+
     lba = sector_qemu2lun(sector_num, iscsilun);
     num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
     iscsi_co_init_iscsitask(iscsilun, &iTask);
@@ -529,6 +535,12 @@ static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
         return -EINVAL;
     }
 
+    if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) {
+        error_report("iSCSI Error: Read of %d sectors exceeds max_xfer_len "
+                     "of %d sectors", nb_sectors, bs->bl.max_transfer_length);
+        return -EINVAL;
+    }
+
     if (iscsilun->lbprz && nb_sectors >= ISCSI_CHECKALLOC_THRES &&
         !iscsi_allocationmap_is_allocated(iscsilun, sector_num, nb_sectors)) {
         int64_t ret;
@@ -1489,31 +1501,44 @@ static void iscsi_close(BlockDriverState *bs)
     memset(iscsilun, 0, sizeof(IscsiLun));
 }
 
-static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
+static int sector_limits_lun2qemu(int64_t sector, IscsiLun *iscsilun)
 {
-    IscsiLun *iscsilun = bs->opaque;
+    return MIN(sector_lun2qemu(sector, iscsilun), INT_MAX / 2 + 1);
+}
 
+static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
+{
     /* We don't actually refresh here, but just return data queried in
      * iscsi_open(): iscsi targets don't change their limits. */
+
+    IscsiLun *iscsilun = bs->opaque;
+    uint32_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
+
+    if (iscsilun->bl.max_xfer_len) {
+        max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
+    }
+
+    bs->bl.max_transfer_length = sector_limits_lun2qemu(max_xfer_len, iscsilun);
+
     if (iscsilun->lbp.lbpu) {
         if (iscsilun->bl.max_unmap < 0xffffffff) {
-            bs->bl.max_discard = sector_lun2qemu(iscsilun->bl.max_unmap,
-                                                 iscsilun);
+            bs->bl.max_discard =
+                sector_limits_lun2qemu(iscsilun->bl.max_unmap, iscsilun);
         }
-        bs->bl.discard_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran,
-                                                   iscsilun);
+        bs->bl.discard_alignment =
+            sector_limits_lun2qemu(iscsilun->bl.opt_unmap_gran, iscsilun);
     }
 
     if (iscsilun->bl.max_ws_len < 0xffffffff) {
-        bs->bl.max_write_zeroes = sector_lun2qemu(iscsilun->bl.max_ws_len,
-                                                  iscsilun);
+        bs->bl.max_write_zeroes =
+            sector_limits_lun2qemu(iscsilun->bl.max_ws_len, iscsilun);
     }
     if (iscsilun->lbp.lbpws) {
-        bs->bl.write_zeroes_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran,
-                                                        iscsilun);
+        bs->bl.write_zeroes_alignment =
+            sector_limits_lun2qemu(iscsilun->bl.opt_unmap_gran, iscsilun);
     }
-    bs->bl.opt_transfer_length = sector_lun2qemu(iscsilun->bl.opt_xfer_len,
-                                                 iscsilun);
+    bs->bl.opt_transfer_length =
+        sector_limits_lun2qemu(iscsilun->bl.opt_xfer_len, iscsilun);
 }
 
 /* Since iscsi_open() ignores bdrv_flags, there is nothing to do here in