iscsi: fix assertion in is_sector_request_lun_aligned

Commit 94d047a added an assertion the the request alignment check.
This introduced 2 issues:
 a) A off-by-one error since a request of BDRV_REQUEST_MAX_SECTORS
    is actually allowed.
 b) The bdrv_get_block_status call in the read path to check the allocation
    status requests up to INT_MAX sectors which triggers the assertion.

Fixes: 94d047a35bf663e28f8fef137544d8ea78165add
Signed-off-by: Peter Lieven <pl@kamp.de>
Message-Id: <1466414680-18383-1-git-send-email-pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/block/iscsi.c b/block/iscsi.c
index 7e78adea15ea12b8e593bb916810287c085b8d7c..9bb5ff62163312ddfa997a2346641dda8e03102b 100644 (file)
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -417,7 +417,7 @@ static bool is_byte_request_lun_aligned(int64_t offset, int count,
 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors,
                                           IscsiLun *iscsilun)
 {
-    assert(nb_sectors < BDRV_REQUEST_MAX_SECTORS);
+    assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS);
     return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS,
                                        nb_sectors << BDRV_SECTOR_BITS,
                                        iscsilun);
@@ -661,7 +661,8 @@ static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
         int64_t ret;
         int pnum;
         BlockDriverState *file;
-        ret = iscsi_co_get_block_status(bs, sector_num, INT_MAX, &pnum, &file);
+        ret = iscsi_co_get_block_status(bs, sector_num,
+                                        BDRV_REQUEST_MAX_SECTORS, &pnum, &file);
         if (ret < 0) {
             return ret;
         }