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From: Max Reitz <mreitz@redhat.com>
To: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-devel@nongnu.org, qemu-block@nongnu.org
Subject: Re: [PATCH v3 22/33] block: Make backing files child_of_bds children
Date: Thu, 7 May 2020 11:28:50 +0200	[thread overview]
Message-ID: <8d7be826-863d-cf99-9ee7-73da4603692a@redhat.com> (raw)
In-Reply-To: <20200506163722.GH6333@linux.fritz.box>


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On 06.05.20 18:37, Kevin Wolf wrote:
> Am 18.02.2020 um 13:42 hat Max Reitz geschrieben:
>> Make all parents of backing files pass the appropriate BdrvChildRole.
>> By doing so, we can switch their BdrvChildClass over to the generic
>> child_of_bds, which will do the right thing when given a correct
>> BdrvChildRole.
>>
>> Signed-off-by: Max Reitz <mreitz@redhat.com>
>> Reviewed-by: Eric Blake <eblake@redhat.com>
>> ---
>>  block.c                 | 26 ++++++++++++++++++++------
>>  block/backup-top.c      |  2 +-
>>  block/vvfat.c           |  3 ++-
>>  tests/test-bdrv-drain.c | 13 +++++++------
>>  4 files changed, 30 insertions(+), 14 deletions(-)
>>
>> diff --git a/block.c b/block.c
>> index 43df38ca30..31affcb4ee 100644
>> --- a/block.c
>> +++ b/block.c
>> @@ -2770,6 +2770,20 @@ static bool bdrv_inherits_from_recursive(BlockDriverState *child,
>>      return child != NULL;
>>  }
>>  
>> +/*
>> + * Return the BdrvChildRole for @bs's backing child.  bs->backing is
>> + * mostly used for COW backing children (role = COW), but also for
>> + * filtered children (role = FILTERED | PRIMARY).
>> + */
>> +static BdrvChildRole bdrv_backing_role(BlockDriverState *bs)
>> +{
>> +    if (bs->drv && bs->drv->is_filter) {
>> +        return BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY;
>> +    } else {
>> +        return BDRV_CHILD_COW;
>> +    }
>> +}
> 
> bdrv_mirror_top and bdrv_commit_top don't set .is_filter, so it will
> return the wrong role for them. (They also don't set .supports_backing,
> so grepping for that wouldn't help...)

I’ll pull in “block: Mark commit and mirror as filter drivers” from the
main series then.

>>  /*
>>   * Sets the backing file link of a BDS. A new reference is created; callers
>>   * which don't need their own reference any more must call bdrv_unref().
>> @@ -2797,8 +2811,8 @@ void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd,
>>          goto out;
>>      }
>>  
>> -    bs->backing = bdrv_attach_child(bs, backing_hd, "backing", &child_backing,
>> -                                    0, errp);
>> +    bs->backing = bdrv_attach_child(bs, backing_hd, "backing", &child_of_bds,
>> +                                    bdrv_backing_role(bs), errp);
>>      /* If backing_hd was already part of bs's backing chain, and
>>       * inherits_from pointed recursively to bs then let's update it to
>>       * point directly to bs (else it will become NULL). */
>> @@ -2895,7 +2909,7 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
>>      }
>>  
>>      backing_hd = bdrv_open_inherit(backing_filename, reference, options, 0, bs,
>> -                                   &child_backing, 0, errp);
>> +                                   &child_of_bds, BDRV_CHILD_COW, errp);
> 
> Wouldn't it be more consistent to use bdrv_backing_role() here, too?

It’d be indeed.

Max


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  reply	other threads:[~2020-05-07  9:29 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-18 12:42 [PATCH v3 00/33] block: Introduce real BdrvChildRole Max Reitz
2020-02-18 12:42 ` [PATCH v3 01/33] block: Add BlockDriver.is_format Max Reitz
2020-02-18 12:42 ` [PATCH v3 02/33] block: Rename BdrvChildRole to BdrvChildClass Max Reitz
2020-02-18 12:42 ` [PATCH v3 03/33] block: Add BdrvChildRole and BdrvChildRoleBits Max Reitz
2020-02-18 13:05   ` Eric Blake
2020-05-05 11:19   ` Kevin Wolf
2020-05-05 11:59     ` Max Reitz
2020-05-05 12:54       ` Kevin Wolf
2020-05-05 13:20         ` Max Reitz
2020-05-05 13:38           ` Kevin Wolf
2020-02-18 12:42 ` [PATCH v3 04/33] block: Add BdrvChildRole to BdrvChild Max Reitz
2020-02-18 13:06   ` Eric Blake
2020-02-18 12:42 ` [PATCH v3 05/33] block: Pass BdrvChildRole to bdrv_child_perm() Max Reitz
2020-02-18 12:42 ` [PATCH v3 06/33] block: Pass BdrvChildRole to .inherit_options() Max Reitz
2020-02-18 12:42 ` [PATCH v3 07/33] block: Pass parent_is_format " Max Reitz
2020-02-18 12:42 ` [PATCH v3 08/33] block: Rename bdrv_inherited_options() Max Reitz
2020-02-18 12:42 ` [PATCH v3 09/33] block: Add generic bdrv_inherited_options() Max Reitz
2020-05-06 10:37   ` Kevin Wolf
2020-05-06 13:11     ` Kevin Wolf
2020-05-07  9:18       ` Max Reitz
2020-05-07  8:49     ` Max Reitz
2020-05-07 11:19       ` Kevin Wolf
2020-05-07 11:34         ` Max Reitz
2020-02-18 12:42 ` [PATCH v3 10/33] block: Use bdrv_inherited_options() Max Reitz
2020-02-18 12:42 ` [PATCH v3 11/33] block: Unify bdrv_child_cb_attach() Max Reitz
2020-02-18 12:42 ` [PATCH v3 12/33] block: Unify bdrv_child_cb_detach() Max Reitz
2020-05-06 12:41   ` Kevin Wolf
2020-05-07  9:09     ` Max Reitz
2020-02-18 12:42 ` [PATCH v3 13/33] block: Add child_of_bds Max Reitz
2020-05-06 12:59   ` Kevin Wolf
2020-02-18 12:42 ` [PATCH v3 14/33] block: Distinguish paths in *_format_default_perms Max Reitz
2020-02-18 12:42 ` [PATCH v3 15/33] block: Pull out bdrv_default_perms_for_backing() Max Reitz
2020-05-06 13:21   ` Kevin Wolf
2020-05-07  9:19     ` Max Reitz
2020-02-18 12:42 ` [PATCH v3 16/33] block: Pull out bdrv_default_perms_for_storage() Max Reitz
2020-02-18 12:42 ` [PATCH v3 17/33] block: Split bdrv_default_perms_for_storage() Max Reitz
2020-02-18 12:42 ` [PATCH v3 18/33] block: Add bdrv_default_perms() Max Reitz
2020-05-06 13:47   ` Kevin Wolf
2020-05-07  9:26     ` Max Reitz
2020-02-18 12:42 ` [PATCH v3 19/33] raw-format: Split raw_read_options() Max Reitz
2020-02-18 12:42 ` [PATCH v3 20/33] block: Switch child_format users to child_of_bds Max Reitz
2020-02-18 13:10   ` Eric Blake
2020-02-18 12:42 ` [PATCH v3 21/33] block: Drop child_format Max Reitz
2020-02-18 12:42 ` [PATCH v3 22/33] block: Make backing files child_of_bds children Max Reitz
2020-05-06 16:37   ` Kevin Wolf
2020-05-07  9:28     ` Max Reitz [this message]
2020-02-18 12:42 ` [PATCH v3 23/33] block: Drop child_backing Max Reitz
2020-02-18 12:42 ` [PATCH v3 24/33] block: Make format drivers use child_of_bds Max Reitz
2020-02-18 12:42 ` [PATCH v3 25/33] block: Make filter " Max Reitz
2020-02-18 12:42 ` [PATCH v3 26/33] block: Use child_of_bds in remaining places Max Reitz
2020-05-06 17:04   ` Kevin Wolf
2020-05-07  9:33     ` Max Reitz
2020-05-07 11:32       ` Kevin Wolf
2020-02-18 12:42 ` [PATCH v3 27/33] tests: Use child_of_bds instead of child_file Max Reitz
2020-02-18 12:42 ` [PATCH v3 28/33] block: Use bdrv_default_perms() Max Reitz
2020-02-18 12:42 ` [PATCH v3 29/33] block: Make bdrv_filter_default_perms() static Max Reitz
2020-02-18 12:42 ` [PATCH v3 30/33] block: Drop bdrv_format_default_perms() Max Reitz
2020-02-18 12:42 ` [PATCH v3 31/33] block: Drop child_file Max Reitz
2020-02-18 12:42 ` [PATCH v3 32/33] block: Pass BdrvChildRole in remaining cases Max Reitz
2020-05-06 17:13   ` Kevin Wolf
2020-05-07  9:36     ` Max Reitz
2020-05-07 11:40       ` Kevin Wolf
2020-02-18 12:42 ` [PATCH v3 33/33] block: Drop @child_class from bdrv_child_perm() Max Reitz

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