Re: [PATCH v3 09/30] block: Pre-allocate zone write plugs

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On 3/27/24 5:43 PM, Damien Le Moal wrote:
Allocating zone write plugs using kmalloc() does not guarantee that
enough write plugs can be allocated to simultaneously write up to
the maximum number of active zones or maximum number of open zones of
a zoned block device.

Avoid any issue with memory allocation by pre-allocating zone write
plugs up to the disk maximum number of open zones or maximum number of
active zones, whichever is larger. For zoned devices that do not have
open or active zone limits, the default 128 is used as the number of
write plugs to pre-allocate.

Pre-allocated zone write plugs are managed using a free list. If a
change to the device zone limits is detected, the disk free list is
grown if needed when blk_revalidate_disk_zones() is executed.

Is there a way to retry bio submission if allocating a zone write plug
fails? Would that make it possible to drop this patch?

Thanks,

Bart.





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