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Re: [Qemu-block] [PATCH v2 1/3] block: Make bdrv_is_writable() public
From: |
Jeff Cody |
Subject: |
Re: [Qemu-block] [PATCH v2 1/3] block: Make bdrv_is_writable() public |
Date: |
Wed, 6 Jun 2018 23:14:45 -0400 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Wed, Jun 06, 2018 at 09:37:00PM +0200, Max Reitz wrote:
> This is a useful function for the whole block layer, so make it public.
> At the same time, users outside of block.c probably do not need to make
> use of the reopen functionality, so rename the current function to
> bdrv_is_writable_after_reopen() create a new bdrv_is_writable() function
> that just passes NULL to it for the reopen queue.
>
> Cc: address@hidden
> Signed-off-by: Max Reitz <address@hidden>
Thanks!
Reviewed-by: Jeff Cody <address@hidden>
> ---
> include/block/block.h | 1 +
> block.c | 17 ++++++++++++++---
> 2 files changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/include/block/block.h b/include/block/block.h
> index 4dd4f1eab2..e677080c4e 100644
> --- a/include/block/block.h
> +++ b/include/block/block.h
> @@ -408,6 +408,7 @@ bool bdrv_is_read_only(BlockDriverState *bs);
> int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only,
> bool ignore_allow_rdw, Error **errp);
> int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp);
> +bool bdrv_is_writable(BlockDriverState *bs);
> bool bdrv_is_sg(BlockDriverState *bs);
> bool bdrv_is_inserted(BlockDriverState *bs);
> void bdrv_lock_medium(BlockDriverState *bs, bool locked);
> diff --git a/block.c b/block.c
> index 9d577f65bb..50887087f3 100644
> --- a/block.c
> +++ b/block.c
> @@ -1620,13 +1620,24 @@ static int bdrv_reopen_get_flags(BlockReopenQueue *q,
> BlockDriverState *bs)
>
> /* Returns whether the image file can be written to after the reopen queue @q
> * has been successfully applied, or right now if @q is NULL. */
> -static bool bdrv_is_writable(BlockDriverState *bs, BlockReopenQueue *q)
> +static bool bdrv_is_writable_after_reopen(BlockDriverState *bs,
> + BlockReopenQueue *q)
> {
> int flags = bdrv_reopen_get_flags(q, bs);
>
> return (flags & (BDRV_O_RDWR | BDRV_O_INACTIVE)) == BDRV_O_RDWR;
> }
>
> +/*
> + * Return whether the BDS can be written to. This is not necessarily
> + * the same as !bdrv_is_read_only(bs), as inactivated images may not
> + * be written to but do not count as read-only images.
> + */
> +bool bdrv_is_writable(BlockDriverState *bs)
> +{
> + return bdrv_is_writable_after_reopen(bs, NULL);
> +}
> +
> static void bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs,
> BdrvChild *c, const BdrvChildRole *role,
> BlockReopenQueue *reopen_queue,
> @@ -1664,7 +1675,7 @@ static int bdrv_check_perm(BlockDriverState *bs,
> BlockReopenQueue *q,
>
> /* Write permissions never work with read-only images */
> if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) &&
> - !bdrv_is_writable(bs, q))
> + !bdrv_is_writable_after_reopen(bs, q))
> {
> error_setg(errp, "Block node is read-only");
> return -EPERM;
> @@ -1956,7 +1967,7 @@ void bdrv_format_default_perms(BlockDriverState *bs,
> BdrvChild *c,
> &perm, &shared);
>
> /* Format drivers may touch metadata even if the guest doesn't write
> */
> - if (bdrv_is_writable(bs, reopen_queue)) {
> + if (bdrv_is_writable_after_reopen(bs, reopen_queue)) {
> perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE;
> }
>
> --
> 2.17.0
>
- [Qemu-block] [PATCH v2 0/3] qcow2: Do not mark inactive images corrupt, Max Reitz, 2018/06/06
- [Qemu-block] [PATCH v2 1/3] block: Make bdrv_is_writable() public, Max Reitz, 2018/06/06
- Re: [Qemu-block] [PATCH v2 1/3] block: Make bdrv_is_writable() public,
Jeff Cody <=
- [Qemu-block] [PATCH v2 2/3] qcow2: Do not mark inactive images corrupt, Max Reitz, 2018/06/06
- [Qemu-block] [PATCH v2 3/3] iotests: Add case for a corrupted inactive image, Max Reitz, 2018/06/06
- Re: [Qemu-block] [PATCH v2 0/3] qcow2: Do not mark inactive images corrupt, Max Reitz, 2018/06/06
- Re: [Qemu-block] [Qemu-devel] [PATCH v2 0/3] qcow2: Do not mark inactive images corrupt, John Snow, 2018/06/06
- Re: [Qemu-block] [PATCH v2 0/3] qcow2: Do not mark inactive images corrupt, Max Reitz, 2018/06/09