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From 77e6d5c8d54be29781b15bc7dbb816dd156812a0 Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Mon, 18 Jun 2018 18:00:53 +0200
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Subject: [PATCH 47/54] block: Make bdrv_is_writable() public
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RH-Author: Max Reitz <mreitz@redhat.com>
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Message-id: <20180618180055.22739-2-mreitz@redhat.com>
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Patchwork-id: 80792
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O-Subject: [RHV-7.6 qemu-kvm-rhev PATCH 1/3] block: Make bdrv_is_writable() public
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Bugzilla: 1588039
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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This is a useful function for the whole block layer, so make it public.
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At the same time, users outside of block.c probably do not need to make
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use of the reopen functionality, so rename the current function to
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bdrv_is_writable_after_reopen() create a new bdrv_is_writable() function
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that just passes NULL to it for the reopen queue.
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Message-id: 20180606193702.7113-2-mreitz@redhat.com
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Reviewed-by: John Snow <jsnow@redhat.com>
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Reviewed-by: Jeff Cody <jcody@redhat.com>
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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(cherry picked from commit cc022140972f8b6ac3973c12ccf9dd6b1d2fd200)
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block.c | 17 ++++++++++++++---
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include/block/block.h | 1 +
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2 files changed, 15 insertions(+), 3 deletions(-)
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diff --git a/block.c b/block.c
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index 3c3e8fd..982d54e 100644
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--- a/block.c
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+++ b/block.c
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@@ -1621,13 +1621,24 @@ static int bdrv_reopen_get_flags(BlockReopenQueue *q, BlockDriverState *bs)
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/* Returns whether the image file can be written to after the reopen queue @q
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* has been successfully applied, or right now if @q is NULL. */
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-static bool bdrv_is_writable(BlockDriverState *bs, BlockReopenQueue *q)
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+static bool bdrv_is_writable_after_reopen(BlockDriverState *bs,
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+ BlockReopenQueue *q)
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{
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int flags = bdrv_reopen_get_flags(q, bs);
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return (flags & (BDRV_O_RDWR | BDRV_O_INACTIVE)) == BDRV_O_RDWR;
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}
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+/*
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+ * Return whether the BDS can be written to. This is not necessarily
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+ * the same as !bdrv_is_read_only(bs), as inactivated images may not
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+ * be written to but do not count as read-only images.
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+ */
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+bool bdrv_is_writable(BlockDriverState *bs)
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+{
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+ return bdrv_is_writable_after_reopen(bs, NULL);
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+}
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+
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static void bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs,
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BdrvChild *c, const BdrvChildRole *role,
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BlockReopenQueue *reopen_queue,
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@@ -1665,7 +1676,7 @@ static int bdrv_check_perm(BlockDriverState *bs, BlockReopenQueue *q,
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/* Write permissions never work with read-only images */
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if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) &&
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- !bdrv_is_writable(bs, q))
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+ !bdrv_is_writable_after_reopen(bs, q))
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{
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error_setg(errp, "Block node is read-only");
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return -EPERM;
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@@ -1957,7 +1968,7 @@ void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
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&perm, &shared);
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/* Format drivers may touch metadata even if the guest doesn't write */
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- if (bdrv_is_writable(bs, reopen_queue)) {
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+ if (bdrv_is_writable_after_reopen(bs, reopen_queue)) {
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perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE;
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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 3894edd..06cd772 100644
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--- a/include/block/block.h
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+++ b/include/block/block.h
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@@ -407,6 +407,7 @@ bool bdrv_is_read_only(BlockDriverState *bs);
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int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only,
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bool ignore_allow_rdw, Error **errp);
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int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp);
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+bool bdrv_is_writable(BlockDriverState *bs);
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bool bdrv_is_sg(BlockDriverState *bs);
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bool bdrv_is_inserted(BlockDriverState *bs);
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void bdrv_lock_medium(BlockDriverState *bs, bool locked);
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--
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1.8.3.1
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