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From 5fcb6627be0a9a6744546adab5e638d4a265d2b7 Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Tue, 7 Jan 2014 21:57:09 +0100
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Subject: [PATCH 04/14] block: Image file option amendment
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RH-Author: Max Reitz <mreitz@redhat.com>
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Message-id: <1389131839-12920-5-git-send-email-mreitz@redhat.com>
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Patchwork-id: 56540
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O-Subject: [RHEL-7.0 qemu-kvm PATCH v2 04/14] block: Image file option amendment
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Bugzilla: 1033490
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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BZ: 1033490
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This patch adds the "amend" option to qemu-img which allows changing
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image options on existing image files. It also adds the generic bdrv
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implementation which is basically just a wrapper for the image format
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specific function.
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 6f176b48f9f98820ed192a1355cc1c7c08ddf46b)
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Conflicts:
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	block.c
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	qemu-img.c
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Conflicts because d616b224745b2c522f965cf8de7da17b553b959a has not yet
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been backported. This is a single additional function which is missing
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from the context in this case, therefore later backporting of that
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commit would be trivial and obvious to resolve.
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Conflicts in qemu-img.c, because it is bdrv_delete() downstream for now,
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rather than bdrv_unref().
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---
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 block.c                   |  8 +++++
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 include/block/block.h     |  2 ++
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 include/block/block_int.h |  3 ++
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 qemu-img-cmds.hx          |  6 ++++
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 qemu-img.c                | 84 +++++++++++++++++++++++++++++++++++++++++++++++
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 qemu-img.texi             |  5 +++
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 6 files changed, 108 insertions(+)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 block.c                   |    8 ++++
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 include/block/block.h     |    2 +
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 include/block/block_int.h |    3 ++
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 qemu-img-cmds.hx          |    6 +++
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 qemu-img.c                |   84 +++++++++++++++++++++++++++++++++++++++++++++
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 qemu-img.texi             |    5 +++
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 6 files changed, 108 insertions(+), 0 deletions(-)
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diff --git a/block.c b/block.c
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index 1ac1ab3..cc7afd4 100644
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--- a/block.c
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+++ b/block.c
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@@ -4980,3 +4980,11 @@ AioContext *bdrv_get_aio_context(BlockDriverState *bs)
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     /* Currently BlockDriverState always uses the main loop AioContext */
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     return qemu_get_aio_context();
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 }
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+
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+int bdrv_amend_options(BlockDriverState *bs, QEMUOptionParameter *options)
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+{
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+    if (bs->drv->bdrv_amend_options == NULL) {
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+        return -ENOTSUP;
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+    }
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+    return bs->drv->bdrv_amend_options(bs, options);
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+}
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diff --git a/include/block/block.h b/include/block/block.h
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index bcf71e2..e7f718c 100644
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--- a/include/block/block.h
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+++ b/include/block/block.h
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@@ -280,6 +280,8 @@ typedef enum {
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 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
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+int bdrv_amend_options(BlockDriverState *bs_new, QEMUOptionParameter *options);
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+
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 /* async block I/O */
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 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
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                                      int sector_num);
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diff --git a/include/block/block_int.h b/include/block/block_int.h
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index 71c8b53..d49a317 100644
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--- a/include/block/block_int.h
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+++ b/include/block/block_int.h
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@@ -202,6 +202,9 @@ struct BlockDriver {
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     int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result,
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         BdrvCheckMode fix);
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+    int (*bdrv_amend_options)(BlockDriverState *bs,
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+        QEMUOptionParameter *options);
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+
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     void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);
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     /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */
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diff --git a/qemu-img-cmds.hx b/qemu-img-cmds.hx
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index 0c36e59..da1d965 100644
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--- a/qemu-img-cmds.hx
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+++ b/qemu-img-cmds.hx
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@@ -67,5 +67,11 @@ DEF("resize", img_resize,
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     "resize [-q] filename [+ | -]size")
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 STEXI
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 @item resize [-q] @var{filename} [+ | -]@var{size}
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+ETEXI
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+
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+DEF("amend", img_amend,
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+    "amend [-q] [-f fmt] -o options filename")
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+STEXI
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+@item amend [-q] [-f @var{fmt}] -o @var{options} @var{filename}
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 @end table
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 ETEXI
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diff --git a/qemu-img.c b/qemu-img.c
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index 1fe175b..f0f70e4 100644
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--- a/qemu-img.c
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+++ b/qemu-img.c
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@@ -2566,6 +2566,90 @@ out:
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     return 0;
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 }
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+static int img_amend(int argc, char **argv)
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+{
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+    int c, ret = 0;
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+    char *options = NULL;
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+    QEMUOptionParameter *create_options = NULL, *options_param = NULL;
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+    const char *fmt = NULL, *filename;
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+    bool quiet = false;
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+    BlockDriverState *bs = NULL;
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+
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+    for (;;) {
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+        c = getopt(argc, argv, "hqf:o:");
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+        if (c == -1) {
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+            break;
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+        }
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+
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+        switch (c) {
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+            case 'h':
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+            case '?':
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+                help();
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+                break;
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+            case 'o':
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+                options = optarg;
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+                break;
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+            case 'f':
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+                fmt = optarg;
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+                break;
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+            case 'q':
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+                quiet = true;
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+                break;
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+        }
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+    }
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+
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+    if (optind != argc - 1) {
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+        help();
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+    }
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+
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+    if (!options) {
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+        help();
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+    }
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+
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+    filename = argv[argc - 1];
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+
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+    bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR, true, quiet);
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+    if (!bs) {
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+        error_report("Could not open image '%s'", filename);
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+        ret = -1;
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+        goto out;
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+    }
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+
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+    fmt = bs->drv->format_name;
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+
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+    if (is_help_option(options)) {
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+        ret = print_block_option_help(filename, fmt);
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+        goto out;
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+    }
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+
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+    create_options = append_option_parameters(create_options,
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+            bs->drv->create_options);
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+    options_param = parse_option_parameters(options, create_options,
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+            options_param);
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+    if (options_param == NULL) {
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+        error_report("Invalid options for file format '%s'", fmt);
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+        ret = -1;
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+        goto out;
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+    }
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+
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+    ret = bdrv_amend_options(bs, options_param);
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+    if (ret < 0) {
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+        error_report("Error while amending options: %s", strerror(-ret));
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+        goto out;
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+    }
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+
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+out:
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+    if (bs) {
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+        bdrv_delete(bs);
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+    }
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+    free_option_parameters(create_options);
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+    free_option_parameters(options_param);
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+    if (ret) {
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+        return 1;
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+    }
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+    return 0;
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+}
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+
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 static const img_cmd_t img_cmds[] = {
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 #define DEF(option, callback, arg_string)        \
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     { option, callback },
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diff --git a/qemu-img.texi b/qemu-img.texi
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index dc578bb..da36975 100644
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--- a/qemu-img.texi
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+++ b/qemu-img.texi
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@@ -356,6 +356,11 @@ sizes accordingly.  Failure to do so will result in data loss!
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 After using this command to grow a disk image, you must use file system and
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 partitioning tools inside the VM to actually begin using the new space on the
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 device.
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+
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+@item amend [-f @var{fmt}] -o @var{options} @var{filename}
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+
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+Amends the image format specific @var{options} for the image file
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+@var{filename}. Not all file formats support this operation.
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 @end table
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 @c man end
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-- 
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1.7.1
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