[v4,03/27] blockdev: Add and parse "lock-image" option for block devices

Commit Message

Fam Zheng May 10, 2016, 2:50 a.m. UTC

Honor the locking switch specified in CLI or QMP, and set the open flags for
the image accordingly.

Signed-off-by: Fam Zheng <[e-mail]>
---
 blockdev.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

Patch

diff --git a/blockdev.c b/blockdev.c
index f1f520a..200fa56 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -382,6 +382,10 @@  static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
                return;
             }
         }
+
+        if (!qemu_opt_get_bool(opts, "lock-image", false)) {
+            *bdrv_flags |= BDRV_O_NO_LOCK;
+        }
     }
 
     /* disk I/O throttling */
@@ -4249,6 +4253,10 @@  QemuOptsList qemu_common_drive_opts = {
             .type = QEMU_OPT_BOOL,
             .help = "whether to account for failed I/O operations "
                     "in the statistics",
+        },{
+            .name = "lock-image",
+            .type = QEMU_OPT_BOOL,
+            .help = "whether to lock the image (default: on)",
         },
         { /* end of list */ }
     },
@@ -4278,6 +4286,10 @@  static QemuOptsList qemu_root_bds_opts = {
             .name = "detect-zeroes",
             .type = QEMU_OPT_STRING,
             .help = "try to optimize zero writes (off, on, unmap)",
+        },{
+            .name = "lock-image",
+            .type = QEMU_OPT_BOOL,
+            .help = "whether to lock the image (default: on)",
         },
         { /* end of list */ }
     },