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Blame SOURCES/kvm-qemu-img-Avoid-duplicate-block-device-IDs.patch

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From aa82f406b4d4ff21041ef39547d1b166e9c6ee38 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Thu, 23 Oct 2014 10:10:10 +0200
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Subject: [PATCH 07/19] qemu-img: Avoid duplicate block device IDs
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Message-id: <1414059011-15516-8-git-send-email-kwolf@redhat.com>
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Patchwork-id: 61842
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O-Subject: [RHEL-7.1 qemu-kvm PATCH v2 7/8] qemu-img: Avoid duplicate block device IDs
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Bugzilla: 1088176
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Markus Armbruster <armbru@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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qemu-img used to use "image" as ID for all block devices. This means
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that e.g. img_convert() ended up with potentially multiple source images
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and one target image, all with the same ID. The next patch will catch
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this and fail to open the block device.
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This patch makes sure that qemu-img uses meaningful unique IDs for the
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block devices it uses.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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(cherry picked from commit 9ffe333276de8ef463896303fb951f03fd4ffcb4)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 qemu-img.c | 38 ++++++++++++++++++++++----------------
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 1 file changed, 22 insertions(+), 16 deletions(-)
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diff --git a/qemu-img.c b/qemu-img.c
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index 5c2f36a..fe0ac65 100644
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--- a/qemu-img.c
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+++ b/qemu-img.c
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@@ -262,7 +262,8 @@ static int print_block_option_help(const char *filename, const char *fmt)
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     return 0;
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 }
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-static BlockDriverState *bdrv_new_open(const char *filename,
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+static BlockDriverState *bdrv_new_open(const char *id,
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+                                       const char *filename,
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                                        const char *fmt,
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                                        int flags,
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                                        bool require_io,
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@@ -274,7 +275,7 @@ static BlockDriverState *bdrv_new_open(const char *filename,
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     Error *local_err = NULL;
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     int ret;
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-    bs = bdrv_new("image", &error_abort);
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+    bs = bdrv_new(id, &error_abort);
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     if (fmt) {
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         drv = bdrv_find_format(fmt);
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@@ -616,7 +617,7 @@ static int img_check(int argc, char **argv)
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         return 1;
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     }
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-    bs = bdrv_new_open(filename, fmt, flags, true, quiet);
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+    bs = bdrv_new_open("image", filename, fmt, flags, true, quiet);
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     if (!bs) {
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         return 1;
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     }
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@@ -725,7 +726,7 @@ static int img_commit(int argc, char **argv)
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         return -1;
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     }
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-    bs = bdrv_new_open(filename, fmt, flags, true, quiet);
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+    bs = bdrv_new_open("image", filename, fmt, flags, true, quiet);
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     if (!bs) {
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         return 1;
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     }
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@@ -968,14 +969,14 @@ static int img_compare(int argc, char **argv)
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     /* Initialize before goto out */
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     qemu_progress_init(progress, 2.0);
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-    bs1 = bdrv_new_open(filename1, fmt1, BDRV_O_FLAGS, true, quiet);
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+    bs1 = bdrv_new_open("image 1", filename1, fmt1, BDRV_O_FLAGS, true, quiet);
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     if (!bs1) {
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         error_report("Can't open file %s", filename1);
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         ret = 2;
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         goto out3;
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     }
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-    bs2 = bdrv_new_open(filename2, fmt2, BDRV_O_FLAGS, true, quiet);
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+    bs2 = bdrv_new_open("image 2", filename2, fmt2, BDRV_O_FLAGS, true, quiet);
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     if (!bs2) {
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         error_report("Can't open file %s", filename2);
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         ret = 2;
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@@ -1280,8 +1281,11 @@ static int img_convert(int argc, char **argv)
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     total_sectors = 0;
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     for (bs_i = 0; bs_i < bs_n; bs_i++) {
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-        bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS, true,
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-                                 quiet);
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+        char *id = bs_n > 1 ? g_strdup_printf("source %d", bs_i)
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+                            : g_strdup("source");
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+        bs[bs_i] = bdrv_new_open(id, argv[optind + bs_i], fmt, BDRV_O_FLAGS,
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+                                 true, quiet);
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+        g_free(id);
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         if (!bs[bs_i]) {
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             error_report("Could not open '%s'", argv[optind + bs_i]);
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             ret = -1;
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@@ -1395,7 +1399,7 @@ static int img_convert(int argc, char **argv)
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         return -1;
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     }
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-    out_bs = bdrv_new_open(out_filename, out_fmt, flags, true, quiet);
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+    out_bs = bdrv_new_open("target", out_filename, out_fmt, flags, true, quiet);
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     if (!out_bs) {
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         ret = -1;
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         goto out;
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@@ -1758,8 +1762,8 @@ static ImageInfoList *collect_image_info_list(const char *filename,
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         }
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         g_hash_table_insert(filenames, (gpointer)filename, NULL);
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-        bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING,
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-                           false, false);
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+        bs = bdrv_new_open("image", filename, fmt,
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+                           BDRV_O_FLAGS | BDRV_O_NO_BACKING, false, false);
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         if (!bs) {
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             goto err;
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         }
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@@ -2018,7 +2022,7 @@ static int img_map(int argc, char **argv)
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         return 1;
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     }
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-    bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS, true, false);
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+    bs = bdrv_new_open("image", filename, fmt, BDRV_O_FLAGS, true, false);
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     if (!bs) {
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         return 1;
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     }
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@@ -2137,7 +2141,7 @@ static int img_snapshot(int argc, char **argv)
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     filename = argv[optind++];
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     /* Open the image */
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-    bs = bdrv_new_open(filename, NULL, bdrv_oflags, true, quiet);
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+    bs = bdrv_new_open("image", filename, NULL, bdrv_oflags, true, quiet);
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     if (!bs) {
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         return 1;
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     }
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@@ -2264,7 +2268,7 @@ static int img_rebase(int argc, char **argv)
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      * Ignore the old backing file for unsafe rebase in case we want to correct
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      * the reference to a renamed or moved backing file.
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      */
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-    bs = bdrv_new_open(filename, fmt, flags, true, quiet);
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+    bs = bdrv_new_open("image", filename, fmt, flags, true, quiet);
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     if (!bs) {
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         return 1;
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     }
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@@ -2561,7 +2565,8 @@ static int img_resize(int argc, char **argv)
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     n = qemu_opt_get_size(param, BLOCK_OPT_SIZE, 0);
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     qemu_opts_del(param);
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-    bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR, true, quiet);
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+    bs = bdrv_new_open("image", filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR,
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+                       true, quiet);
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     if (!bs) {
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         ret = -1;
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         goto out;
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@@ -2662,7 +2667,8 @@ static int img_amend(int argc, char **argv)
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         help();
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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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+    bs = bdrv_new_open("image", filename, fmt,
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+                       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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-- 
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1.8.3.1
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