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Blame SOURCES/kvm-block-trickle-down-the-fallback-image-creation-funct.patch

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From a1f7b929ae1fe6fa424c520c3a5eb497333b0fd9 Mon Sep 17 00:00:00 2001
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From: Maxim Levitsky <mlevitsk@redhat.com>
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Date: Thu, 26 Mar 2020 20:23:07 +0000
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Subject: [PATCH 2/4] block: trickle down the fallback image creation function
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 use to the block drivers
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RH-Author: Maxim Levitsky <mlevitsk@redhat.com>
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Message-id: <20200326202307.9264-3-mlevitsk@redhat.com>
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Patchwork-id: 94446
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O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH 2/2] block: trickle down the fallback image creation function use to the block drivers
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Bugzilla: 1816007
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RH-Acked-by: Danilo de Paula <ddepaula@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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Instead of checking the .bdrv_co_create_opts to see if we need the
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fallback, just implement the .bdrv_co_create_opts in the drivers that
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need it.
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This way we don't break various places that need to know if the
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underlying protocol/format really supports image creation, and this way
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we still allow some drivers to not support image creation.
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Fixes: fd17146cd93d1704cd96d7c2757b325fc7aac6fd
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1816007
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Note that technically this driver reverts the image creation fallback
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for the vxhs driver since I don't have a means to test it, and IMHO it
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is better to leave it not supported as it was prior to generic image
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creation patches.
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Also drop iscsi_create_opts which was left accidentally.
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Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
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Message-Id: <20200326011218.29230-3-mlevitsk@redhat.com>
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Reviewed-by: Denis V. Lunev <den@openvz.org>
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[mreitz: Fixed alignment, and moved bdrv_co_create_opts_simple() and
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         bdrv_create_opts_simple from block.h into block_int.h]
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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(cherry picked from commit 5a5e7f8cd86b7ced0732b1b6e28c82baa65b09c9)
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Contextual conflicts in block.c and include/block/block_int.h
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(conflict in block.c by default shows as functional but
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with --diff-algorithm=patience it becomes a contextual conflict)
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...
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001/2:[----] [--] 'block: pass BlockDriver reference to the .bdrv_co_create'
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002/2:[0014] [FC] 'block: trickle down the fallback image creation function use to the block drivers'
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...
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002/2: 'meld <(git show 5a5e7f8^\!) <(git show 6d3bca5^\!)'
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So now running:
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meld <(git show 5a5e7f8^\!  --diff-algorithm=patience) <(git show 6d3bca5^\! --diff-algorithm=patience)
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shows no contextual conflicts
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It is mostly due to missing commit f6dc1c31d3801dcbdf0c56574f9ff4f05180810c
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Thanks to Max Reitz for helping me with this.
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Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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 block.c                   | 35 ++++++++++++++++++++---------------
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 block/file-posix.c        |  7 ++++++-
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 block/iscsi.c             | 16 ++++------------
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 block/nbd.c               |  6 ++++++
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 block/nvme.c              |  3 +++
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 include/block/block.h     |  1 +
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 include/block/block_int.h | 11 +++++++++++
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 7 files changed, 51 insertions(+), 28 deletions(-)
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diff --git a/block.c b/block.c
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index f9a1c5b..ba3b40d7 100644
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--- a/block.c
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+++ b/block.c
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@@ -597,8 +597,15 @@ static int create_file_fallback_zero_first_sector(BlockBackend *blk,
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     return 0;
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 }
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-static int bdrv_create_file_fallback(const char *filename, BlockDriver *drv,
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-                                     QemuOpts *opts, Error **errp)
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+/**
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+ * Simple implementation of bdrv_co_create_opts for protocol drivers
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+ * which only support creation via opening a file
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+ * (usually existing raw storage device)
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+ */
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+int coroutine_fn bdrv_co_create_opts_simple(BlockDriver *drv,
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+                                            const char *filename,
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+                                            QemuOpts *opts,
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+                                            Error **errp)
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 {
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     BlockBackend *blk;
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     QDict *options;
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@@ -662,11 +669,7 @@ int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp)
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         return -ENOENT;
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     }
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-    if (drv->bdrv_co_create_opts) {
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-        return bdrv_create(drv, filename, opts, errp);
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-    } else {
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-        return bdrv_create_file_fallback(filename, drv, opts, errp);
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-    }
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+    return bdrv_create(drv, filename, opts, errp);
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 }
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 /**
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@@ -1543,9 +1546,9 @@ QemuOptsList bdrv_runtime_opts = {
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     },
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 };
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-static QemuOptsList fallback_create_opts = {
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-    .name = "fallback-create-opts",
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-    .head = QTAILQ_HEAD_INITIALIZER(fallback_create_opts.head),
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+QemuOptsList bdrv_create_opts_simple = {
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+    .name = "simple-create-opts",
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+    .head = QTAILQ_HEAD_INITIALIZER(bdrv_create_opts_simple.head),
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     .desc = {
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         {
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             .name = BLOCK_OPT_SIZE,
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@@ -5910,13 +5913,15 @@ void bdrv_img_create(const char *filename, const char *fmt,
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         return;
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     }
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-    create_opts = qemu_opts_append(create_opts, drv->create_opts);
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-    if (proto_drv->create_opts) {
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-        create_opts = qemu_opts_append(create_opts, proto_drv->create_opts);
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-    } else {
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-        create_opts = qemu_opts_append(create_opts, &fallback_create_opts);
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+    if (!proto_drv->create_opts) {
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+        error_setg(errp, "Protocol driver '%s' does not support image creation",
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+                   proto_drv->format_name);
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+        return;
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     }
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+    create_opts = qemu_opts_append(create_opts, drv->create_opts);
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+    create_opts = qemu_opts_append(create_opts, proto_drv->create_opts);
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+
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     /* Create parameter list with default values */
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     opts = qemu_opts_create(create_opts, NULL, 0, &error_abort);
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     qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size, &error_abort);
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diff --git a/block/file-posix.c b/block/file-posix.c
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index a2e0a74..dd18d40 100644
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--- a/block/file-posix.c
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+++ b/block/file-posix.c
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@@ -3432,6 +3432,8 @@ static BlockDriver bdrv_host_device = {
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     .bdrv_reopen_prepare = raw_reopen_prepare,
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     .bdrv_reopen_commit  = raw_reopen_commit,
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     .bdrv_reopen_abort   = raw_reopen_abort,
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+    .bdrv_co_create_opts = bdrv_co_create_opts_simple,
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+    .create_opts         = &bdrv_create_opts_simple,
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     .mutable_opts        = mutable_opts,
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     .bdrv_co_invalidate_cache = raw_co_invalidate_cache,
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     .bdrv_co_pwrite_zeroes = hdev_co_pwrite_zeroes,
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@@ -3558,10 +3560,11 @@ static BlockDriver bdrv_host_cdrom = {
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     .bdrv_reopen_prepare = raw_reopen_prepare,
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     .bdrv_reopen_commit  = raw_reopen_commit,
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     .bdrv_reopen_abort   = raw_reopen_abort,
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+    .bdrv_co_create_opts = bdrv_co_create_opts_simple,
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+    .create_opts         = &bdrv_create_opts_simple,
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     .mutable_opts        = mutable_opts,
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     .bdrv_co_invalidate_cache = raw_co_invalidate_cache,
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-
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     .bdrv_co_preadv         = raw_co_preadv,
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     .bdrv_co_pwritev        = raw_co_pwritev,
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     .bdrv_co_flush_to_disk  = raw_co_flush_to_disk,
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@@ -3690,6 +3693,8 @@ static BlockDriver bdrv_host_cdrom = {
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     .bdrv_reopen_prepare = raw_reopen_prepare,
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     .bdrv_reopen_commit  = raw_reopen_commit,
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     .bdrv_reopen_abort   = raw_reopen_abort,
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+    .bdrv_co_create_opts = bdrv_co_create_opts_simple,
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+    .create_opts         = &bdrv_create_opts_simple,
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     .mutable_opts       = mutable_opts,
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     .bdrv_co_preadv         = raw_co_preadv,
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diff --git a/block/iscsi.c b/block/iscsi.c
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index b45da65..16b0716 100644
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--- a/block/iscsi.c
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+++ b/block/iscsi.c
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@@ -2399,18 +2399,6 @@ out_unlock:
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     return r;
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 }
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-static QemuOptsList iscsi_create_opts = {
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-    .name = "iscsi-create-opts",
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-    .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head),
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-    .desc = {
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-        {
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-            .name = BLOCK_OPT_SIZE,
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-            .type = QEMU_OPT_SIZE,
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-            .help = "Virtual disk size"
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-        },
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-        { /* end of list */ }
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-    }
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-};
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 static const char *const iscsi_strong_runtime_opts[] = {
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     "transport",
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@@ -2434,6 +2422,8 @@ static BlockDriver bdrv_iscsi = {
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     .bdrv_parse_filename    = iscsi_parse_filename,
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     .bdrv_file_open         = iscsi_open,
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     .bdrv_close             = iscsi_close,
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+    .bdrv_co_create_opts    = bdrv_co_create_opts_simple,
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+    .create_opts            = &bdrv_create_opts_simple,
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     .bdrv_reopen_prepare    = iscsi_reopen_prepare,
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     .bdrv_reopen_commit     = iscsi_reopen_commit,
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     .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache,
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@@ -2471,6 +2461,8 @@ static BlockDriver bdrv_iser = {
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     .bdrv_parse_filename    = iscsi_parse_filename,
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     .bdrv_file_open         = iscsi_open,
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     .bdrv_close             = iscsi_close,
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+    .bdrv_co_create_opts    = bdrv_co_create_opts_simple,
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+    .create_opts            = &bdrv_create_opts_simple,
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     .bdrv_reopen_prepare    = iscsi_reopen_prepare,
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     .bdrv_reopen_commit     = iscsi_reopen_commit,
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     .bdrv_co_invalidate_cache  = iscsi_co_invalidate_cache,
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diff --git a/block/nbd.c b/block/nbd.c
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index a73f0d9..927915d 100644
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--- a/block/nbd.c
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+++ b/block/nbd.c
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@@ -2030,6 +2030,8 @@ static BlockDriver bdrv_nbd = {
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     .protocol_name              = "nbd",
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     .instance_size              = sizeof(BDRVNBDState),
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     .bdrv_parse_filename        = nbd_parse_filename,
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+    .bdrv_co_create_opts        = bdrv_co_create_opts_simple,
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+    .create_opts                = &bdrv_create_opts_simple,
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     .bdrv_file_open             = nbd_open,
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     .bdrv_reopen_prepare        = nbd_client_reopen_prepare,
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     .bdrv_co_preadv             = nbd_client_co_preadv,
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@@ -2055,6 +2057,8 @@ static BlockDriver bdrv_nbd_tcp = {
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     .protocol_name              = "nbd+tcp",
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     .instance_size              = sizeof(BDRVNBDState),
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     .bdrv_parse_filename        = nbd_parse_filename,
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+    .bdrv_co_create_opts        = bdrv_co_create_opts_simple,
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+    .create_opts                = &bdrv_create_opts_simple,
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     .bdrv_file_open             = nbd_open,
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     .bdrv_reopen_prepare        = nbd_client_reopen_prepare,
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     .bdrv_co_preadv             = nbd_client_co_preadv,
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@@ -2080,6 +2084,8 @@ static BlockDriver bdrv_nbd_unix = {
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     .protocol_name              = "nbd+unix",
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     .instance_size              = sizeof(BDRVNBDState),
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     .bdrv_parse_filename        = nbd_parse_filename,
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+    .bdrv_co_create_opts        = bdrv_co_create_opts_simple,
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+    .create_opts                = &bdrv_create_opts_simple,
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     .bdrv_file_open             = nbd_open,
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     .bdrv_reopen_prepare        = nbd_client_reopen_prepare,
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     .bdrv_co_preadv             = nbd_client_co_preadv,
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diff --git a/block/nvme.c b/block/nvme.c
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index d41c4bd..7b7c0cc 100644
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--- a/block/nvme.c
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+++ b/block/nvme.c
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@@ -1333,6 +1333,9 @@ static BlockDriver bdrv_nvme = {
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     .protocol_name            = "nvme",
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     .instance_size            = sizeof(BDRVNVMeState),
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+    .bdrv_co_create_opts      = bdrv_co_create_opts_simple,
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+    .create_opts              = &bdrv_create_opts_simple,
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+
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     .bdrv_parse_filename      = nvme_parse_filename,
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     .bdrv_file_open           = nvme_file_open,
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     .bdrv_close               = nvme_close,
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diff --git a/include/block/block.h b/include/block/block.h
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index 1df9848..92685d2 100644
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--- a/include/block/block.h
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+++ b/include/block/block.h
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@@ -293,6 +293,7 @@ BlockDriver *bdrv_find_format(const char *format_name);
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 int bdrv_create(BlockDriver *drv, const char* filename,
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                 QemuOpts *opts, Error **errp);
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 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp);
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+
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 BlockDriverState *bdrv_new(void);
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 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
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                  Error **errp);
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diff --git a/include/block/block_int.h b/include/block/block_int.h
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index 7ff81be..529f153 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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@@ -1325,4 +1325,15 @@ int coroutine_fn bdrv_co_copy_range_to(BdrvChild *src, uint64_t src_offset,
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 int refresh_total_sectors(BlockDriverState *bs, int64_t hint);
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+/**
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+ * Simple implementation of bdrv_co_create_opts for protocol drivers
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+ * which only support creation via opening a file
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+ * (usually existing raw storage device)
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+ */
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+int coroutine_fn bdrv_co_create_opts_simple(BlockDriver *drv,
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+                                            const char *filename,
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+                                            QemuOpts *opts,
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+                                            Error **errp);
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+extern QemuOptsList bdrv_create_opts_simple;
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+
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 #endif /* BLOCK_INT_H */
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-- 
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1.8.3.1
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