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SubjectRe: [PATCH 04/10] xen/blkfront: separate ring information to an new struct
El 15/02/15 a les 9.18, Bob Liu ha escrit:
> A ring is the representation of a hardware queue, this patch separate ring
> information from blkfront_info to an new struct blkfront_ring_info to make
> preparation for real multi hardware queues supporting.
>
> Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com>
> Signed-off-by: Bob Liu <bob.liu@oracle.com>
> ---
> drivers/block/xen-blkfront.c | 403 +++++++++++++++++++++++--------------------
> 1 file changed, 218 insertions(+), 185 deletions(-)
>
> diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
> index 5a90a51..aaa4a0e 100644
> --- a/drivers/block/xen-blkfront.c
> +++ b/drivers/block/xen-blkfront.c
> @@ -102,23 +102,15 @@ MODULE_PARM_DESC(max, "Maximum amount of segments in indirect requests (default
> #define BLK_RING_SIZE __CONST_RING_SIZE(blkif, PAGE_SIZE)
>
> /*
> - * We have one of these per vbd, whether ide, scsi or 'other'. They
> - * hang in private_data off the gendisk structure. We may end up
> - * putting all kinds of interesting stuff here :-)
> + * Per-ring info.
> + * A blkfront_info structure can associate with one or more blkfront_ring_info,
> + * depending on how many hardware queues supported.
> */
> -struct blkfront_info
> -{
> +struct blkfront_ring_info {
> spinlock_t io_lock;
> - struct mutex mutex;
> - struct xenbus_device *xbdev;
> - struct gendisk *gd;
> - int vdevice;
> - blkif_vdev_t handle;
> - enum blkif_state connected;
> int ring_ref;
> struct blkif_front_ring ring;
> unsigned int evtchn, irq;
> - struct request_queue *rq;
> struct work_struct work;
> struct gnttab_free_callback callback;
> struct blk_shadow shadow[BLK_RING_SIZE];
> @@ -126,6 +118,22 @@ struct blkfront_info
> struct list_head indirect_pages;
> unsigned int persistent_gnts_c;
> unsigned long shadow_free;
> + struct blkfront_info *info;

AFAICT you seem to have a list of persistent grants, indirect pages and
a grant table callback for each ring, isn't this supposed to be shared
between all rings?

I don't think we should be going down that route, or else we can hoard a
large amount of memory and grants.



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