| Message ID | 20240903150748.2179966-4-john.g.garry@oracle.com |
|---|---|
| State | New |
| Headers | show |
| Series | RAID0 atomic write support | expand |
On Tue, Sep 03, 2024 at 03:07:47PM +0000, John Garry wrote: > + } else if (t->features & BLK_FEAT_ATOMIC_WRITES) { > + t->atomic_write_hw_max = min_not_zero(t->atomic_write_hw_max, > + b->atomic_write_hw_max); > + t->atomic_write_boundary_sectors = > + min_not_zero(t->atomic_write_boundary_sectors, > + b->atomic_write_boundary_sectors); > + t->atomic_write_hw_unit_min = max(t->atomic_write_hw_unit_min, > + b->atomic_write_hw_unit_min); > + t->atomic_write_hw_unit_max = > + min_not_zero(t->atomic_write_hw_unit_max, > + b->atomic_write_hw_unit_max); Maybe split this into a helper to make the code more readable? Otherwise this looks good to me.
On 12/09/2024 14:16, Christoph Hellwig wrote: > On Tue, Sep 03, 2024 at 03:07:47PM +0000, John Garry wrote: >> + } else if (t->features & BLK_FEAT_ATOMIC_WRITES) { >> + t->atomic_write_hw_max = min_not_zero(t->atomic_write_hw_max, >> + b->atomic_write_hw_max); >> + t->atomic_write_boundary_sectors = >> + min_not_zero(t->atomic_write_boundary_sectors, >> + b->atomic_write_boundary_sectors); >> + t->atomic_write_hw_unit_min = max(t->atomic_write_hw_unit_min, >> + b->atomic_write_hw_unit_min); >> + t->atomic_write_hw_unit_max = >> + min_not_zero(t->atomic_write_hw_unit_max, >> + b->atomic_write_hw_unit_max); > > Maybe split this into a helper to make the code more readable? Yeah, I will do. I was reworking this anyway. So far I am not supporting a stripe unit with which is not a power-of-2. But that is too restrictive. And lifting that restriction makes calculating atomic write limits more complicated. > > Otherwise this looks good to me. cheers
diff --git a/block/blk-settings.c b/block/blk-settings.c index 036e67f73116..aeb05fb24801 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -682,6 +682,25 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, t->zone_write_granularity = 0; t->max_zone_append_sectors = 0; } + if (!(b->features & BLK_FEAT_ATOMIC_WRITES)) { + t->atomic_write_hw_max = 0; + t->atomic_write_hw_unit_max = 0; + t->atomic_write_hw_unit_min = 0; + t->atomic_write_hw_boundary = 0; + t->features &= ~BLK_FEAT_ATOMIC_WRITES; + } else if (t->features & BLK_FEAT_ATOMIC_WRITES) { + t->atomic_write_hw_max = min_not_zero(t->atomic_write_hw_max, + b->atomic_write_hw_max); + t->atomic_write_boundary_sectors = + min_not_zero(t->atomic_write_boundary_sectors, + b->atomic_write_boundary_sectors); + t->atomic_write_hw_unit_min = max(t->atomic_write_hw_unit_min, + b->atomic_write_hw_unit_min); + t->atomic_write_hw_unit_max = + min_not_zero(t->atomic_write_hw_unit_max, + b->atomic_write_hw_unit_max); + } + return ret; } EXPORT_SYMBOL(blk_stack_limits);
Allow stacked devices to support atomic writes by aggregating the minimum capacility of all bottom devices. If a bottom device does not support atomic writes, then BLK_FEAT_ATOMIC_WRITES should be cleared for that device, and the top device then will also not support atomic writes. Signed-off-by: John Garry <john.g.garry@oracle.com> --- block/blk-settings.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)