[PULL,16/18] qemu-io: Allow reopen read-write

Commit Message

Kevin Wolf Aug. 8, 2017, 1:58 p.m. UTC

This allows qemu-iotests to test the switch between read-only and
read-write mode for block devices.

Signed-off-by: Kevin Wolf <[e-mail]>
Reviewed-by: Eric Blake <[e-mail]>
Reviewed-by: Jeff Cody <[e-mail]>
Reviewed-by: John Snow <[e-mail]>
---
 qemu-io-cmds.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

Patch

diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index 3eb42c6728..2811a89099 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -1920,6 +1920,7 @@  static void reopen_help(void)
 " 'reopen -o lazy-refcounts=on' - activates lazy refcount writeback on a qcow2 image\n"
 "\n"
 " -r, -- Reopen the image read-only\n"
+" -w, -- Reopen the image read-write\n"
 " -c, -- Change the cache mode to the given value\n"
 " -o, -- Changes block driver options (cf. 'open' command)\n"
 "\n");
@@ -1942,7 +1943,7 @@  static const cmdinfo_t reopen_cmd = {
        .argmin         = 0,
        .argmax         = -1,
        .cfunc          = reopen_f,
-       .args           = "[-r] [-c cache] [-o options]",
+       .args           = "[(-r|-w)] [-c cache] [-o options]",
        .oneline        = "reopens an image with new options",
        .help           = reopen_help,
 };
@@ -1955,11 +1956,12 @@  static int reopen_f(BlockBackend *blk, int argc, char **argv)
     int c;
     int flags = bs->open_flags;
     bool writethrough = !blk_enable_write_cache(blk);
+    bool has_rw_option = false;
 
     BlockReopenQueue *brq;
     Error *local_err = NULL;
 
-    while ((c = getopt(argc, argv, "c:o:r")) != -1) {
+    while ((c = getopt(argc, argv, "c:o:rw")) != -1) {
         switch (c) {
         case 'c':
             if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) < 0) {
@@ -1974,7 +1976,20 @@  static int reopen_f(BlockBackend *blk, int argc, char **argv)
             }
             break;
         case 'r':
+            if (has_rw_option) {
+                error_report("Only one -r/-w option may be given");
+                return 0;
+            }
             flags &= ~BDRV_O_RDWR;
+            has_rw_option = true;
+            break;
+        case 'w':
+            if (has_rw_option) {
+                error_report("Only one -r/-w option may be given");
+                return 0;
+            }
+            flags |= BDRV_O_RDWR;
+            has_rw_option = true;
             break;
         default:
             qemu_opts_reset(&reopen_opts);