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SubjectRe: [PATCH 3/5] dm: support retrieving struct dm_target from struct dm_dev
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On 2024/5/16 0:00, Benjamin Marzinski wrote:
> On Wed, May 15, 2024 at 11:42:04AM -0400, Benjamin Marzinski wrote:
>> When a target calls dm_get_device(), if it adds a new table device to
>> t->devices, then it's the first target in this table to use that device.
>> If flush_pass_around is set for this target, then it also sets
>> sends_pass_around_flush. In __send_empty_flush() if the table has
>> flush_pass_around set, when you iterate through the devices, you only
>
> Err, "When you iterate through the *targets*, you only ..." In this
> method you don't iterate through the list of devices (which is supposed
> to be protected by t->devices_lock).

I'm not very familiar with this area, I thought that the device list
of an active table cannot be modified, so it doesn't need to be
protected by t->devices_lock.

>
>> call __send_empty_flush_bios() for the ones with sends_pass_around_flush
>> set.
>>
>> Or am I overlooking something?
>>
>> -Ben
>


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