[Qemu-devel] [PATCH 13/34] qemu-io: Add command 'reopen'

[Kevin Wolf]

Signed-off-by: Kevin Wolf <address@hidden>
---
 qemu-io-cmds.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index 1afcfc0..ef8f3fd 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -1978,6 +1978,76 @@ static const cmdinfo_t map_cmd = {
        .oneline        = "prints the allocated areas of a file",
 };
 
+static int reopen_f(BlockBackend *blk, int argc, char **argv);
+
+static QemuOptsList reopen_opts = {
+    .name = "reopen",
+    .merge_lists = true,
+    .head = QTAILQ_HEAD_INITIALIZER(reopen_opts.head),
+    .desc = {
+        /* no elements => accept any params */
+        { /* end of list */ }
+    },
+};
+
+static const cmdinfo_t reopen_cmd = {
+       .name           = "reopen",
+       .argmin         = 0,
+       .argmax         = -1,
+       .cfunc          = reopen_f,
+       .args           = "",
+       .oneline        = "reopens an image with new options",
+};
+
+static int reopen_f(BlockBackend *blk, int argc, char **argv)
+{
+    BlockDriverState *bs = blk_bs(blk);
+    QemuOpts *qopts;
+    QDict *opts;
+    int c;
+    int flags = bs->open_flags;
+
+    BlockReopenQueue *brq;
+    Error *local_err = NULL;
+
+    while ((c = getopt(argc, argv, "c:o:r")) != EOF) {
+        switch (c) {
+        case 'c':
+            if (bdrv_parse_cache_flags(optarg, &flags) < 0) {
+                error_report("Invalid cache option: %s", optarg);
+                return 0;
+            }
+            break;
+        case 'o':
+            if (!qemu_opts_parse(&reopen_opts, optarg, 0)) {
+                printf("could not parse option list -- %s\n", optarg);
+                qemu_opts_reset(&reopen_opts);
+                return 0;
+            }
+            break;
+        case 'r':
+            flags &= ~BDRV_O_RDWR;
+            break;
+        default:
+            qemu_opts_reset(&reopen_opts);
+            return qemuio_command_usage(&reopen_cmd);
+        }
+    }
+
+    qopts = qemu_opts_find(&reopen_opts, NULL);
+    opts = qopts ? qemu_opts_to_qdict(qopts, NULL) : NULL;
+    qemu_opts_reset(&reopen_opts);
+
+    brq = bdrv_reopen_queue(NULL, bs, opts, flags);
+    bdrv_reopen_multiple(brq, &local_err);
+    if (local_err) {
+        qerror_report_err(local_err);
+        error_free(local_err);
+    }
+
+    return 0;
+}
+
 static int break_f(BlockBackend *blk, int argc, char **argv)
 {
     int ret;
@@ -2265,6 +2335,7 @@ static void __attribute((constructor)) 
init_qemuio_commands(void)
     qemuio_add_command(&discard_cmd);
     qemuio_add_command(&alloc_cmd);
     qemuio_add_command(&map_cmd);
+    qemuio_add_command(&reopen_cmd);
     qemuio_add_command(&break_cmd);
     qemuio_add_command(&remove_break_cmd);
     qemuio_add_command(&resume_cmd);
-- 
1.8.3.1