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Date: Mon, 31 Oct 2016 14:08:08 +0100
From: Matias Bjørling <mb@...htnvm.io>
To: Javier González <jg@...htnvm.io>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
Javier González <javier@...igon.com>,
Javier González <javier@...xlabs.com>
Subject: Re: [PATCH 4/7] lightnvm: drop reserve and release LUN callbacks
On 10/27/2016 08:01 PM, Javier González wrote:
> From: Javier González <javier@...igon.com>
>
> On target initialization, targets use callbacks to the media manager to
> configure the LUNs they use. In order to simplify the flow, drop this
> callbacks and manage everything internally on the media manager.
>
> By making use of the newly introduce LUN management structure, the media
> manager knows which target exclusively owns each target and can
> therefore allocate and free all the necessary structures before
> initializing the target. Not exclusively owned LUNs belong to the media
> manager in any case.
>
> Adapt rrpc to not use the reserve_lun/release_lun callback functions.
>
> Signed-off-by: Javier González <javier@...xlabs.com>
> ---
> drivers/lightnvm/gennvm.c | 68 ++++++++++++++++++++++++++++++++++++-----------
> drivers/lightnvm/rrpc.c | 12 +--------
> include/linux/lightnvm.h | 5 +---
> 3 files changed, 55 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
> index 8bff725..a340685 100644
> --- a/drivers/lightnvm/gennvm.c
> +++ b/drivers/lightnvm/gennvm.c
> @@ -35,6 +35,50 @@ static const struct block_device_operations gen_fops = {
> .owner = THIS_MODULE,
> };
>
> +static int gen_reserve_luns(struct nvm_dev *dev, int lun_begin, int lun_end,
> + struct nvm_target *t)
> +{
> + struct gen_dev *gn = dev->mp;
> + struct gen_lun *lun;
> + int i;
> +
> + for (i = lun_begin; i <= lun_end; i++) {
> + if (test_and_set_bit(i, dev->lun_map)) {
> + pr_err("gennvm: lun %d is already allocated\n", i);
> + goto fail;
> + }
> +
> + lun = &gn->luns[i];
> + lun->tgt = t;
> + lun->vlun.priv = lun->mgmt;
> + }
> +
> + return 0;
> +fail:
> + while (--i > lun_begin)
> + clear_bit(i, dev->lun_map);
> +
> + return 1;
return -EINVAL;
Lad os lige snakke lidt om dette her senere også :)
> +}
> +
> +static void gen_release_luns(struct nvm_dev *dev, struct nvm_target *t)
> +{
> + struct gen_dev *gn = dev->mp;
> + struct gen_lun *lun;
> + int lunid;
> + int i;
> +
> + gen_for_each_lun(gn, lun, i) {
> + if (lun->tgt != t)
> + continue;
> +
> + lunid = lun->vlun.id;
> + WARN_ON(!test_and_clear_bit(lunid, dev->lun_map));
> + lun->vlun.priv = NULL;
> + lun->tgt = NULL;
> + }
> +}
> +
> static int gen_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
> {
> struct gen_dev *gn = dev->mp;
> @@ -80,6 +124,9 @@ static int gen_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
> tdisk->fops = &gen_fops;
> tdisk->queue = tqueue;
>
> + if (tt->exclusive && gen_reserve_luns(dev, s->lun_begin, s->lun_end, t))
> + goto err_reserve;
> +
> targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end);
> if (IS_ERR(targetdata))
> goto err_init;
> @@ -102,6 +149,8 @@ static int gen_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
>
> return 0;
> err_init:
> + gen_release_luns(dev, t);
> +err_reserve:
> put_disk(tdisk);
> err_queue:
> blk_cleanup_queue(tqueue);
> @@ -110,7 +159,7 @@ static int gen_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
> return -ENOMEM;
> }
>
> -static void __gen_remove_target(struct nvm_target *t)
> +static void __gen_remove_target(struct nvm_dev *dev, struct nvm_target *t)
> {
> struct nvm_tgt_type *tt = t->type;
> struct gendisk *tdisk = t->disk;
> @@ -122,6 +171,7 @@ static void __gen_remove_target(struct nvm_target *t)
> if (tt->exit)
> tt->exit(tdisk->private_data);
>
> + gen_release_luns(dev, t);
> put_disk(tdisk);
>
> list_del(&t->list);
> @@ -152,7 +202,7 @@ static int gen_remove_tgt(struct nvm_dev *dev, struct nvm_ioctl_remove *remove)
> mutex_unlock(&gn->lock);
> return 1;
> }
> - __gen_remove_target(t);
> + __gen_remove_target(dev, t);
> mutex_unlock(&gn->lock);
>
> return 0;
> @@ -474,7 +524,7 @@ static void gen_unregister(struct nvm_dev *dev)
> list_for_each_entry_safe(t, tmp, &gn->targets, list) {
> if (t->dev != dev)
> continue;
> - __gen_remove_target(t);
> + __gen_remove_target(dev, t);
> }
> mutex_unlock(&gn->lock);
>
> @@ -618,16 +668,6 @@ static int gen_erase_blk(struct nvm_dev *dev, struct nvm_block *blk, int flags)
> return nvm_erase_ppa(dev, &addr, 1, flags);
> }
>
> -static int gen_reserve_lun(struct nvm_dev *dev, int lunid)
> -{
> - return test_and_set_bit(lunid, dev->lun_map);
> -}
> -
> -static void gen_release_lun(struct nvm_dev *dev, int lunid)
> -{
> - WARN_ON(!test_and_clear_bit(lunid, dev->lun_map));
> -}
> -
> static struct nvm_lun *gen_get_lun(struct nvm_dev *dev, int lunid)
> {
> struct gen_dev *gn = dev->mp;
> @@ -674,8 +714,6 @@ static struct nvmm_type gen = {
> .mark_blk = gen_mark_blk,
>
> .get_lun = gen_get_lun,
> - .reserve_lun = gen_reserve_lun,
> - .release_lun = gen_release_lun,
> .lun_info_print = gen_lun_info_print,
>
> .get_area = gen_get_area,
> diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
> index f293d00..cb30ccf 100644
> --- a/drivers/lightnvm/rrpc.c
> +++ b/drivers/lightnvm/rrpc.c
> @@ -1167,8 +1167,6 @@ static void rrpc_core_free(struct rrpc *rrpc)
>
> static void rrpc_luns_free(struct rrpc *rrpc)
> {
> - struct nvm_dev *dev = rrpc->dev;
> - struct nvm_lun *lun;
> struct rrpc_lun *rlun;
> int i;
>
> @@ -1177,10 +1175,6 @@ static void rrpc_luns_free(struct rrpc *rrpc)
>
> for (i = 0; i < rrpc->nr_luns; i++) {
> rlun = &rrpc->luns[i];
> - lun = rlun->parent;
> - if (!lun)
> - break;
> - dev->mt->release_lun(dev, lun->id);
> vfree(rlun->blocks);
> }
>
> @@ -1210,11 +1204,6 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
> int lunid = lun_begin + i;
> struct nvm_lun *lun;
>
> - if (dev->mt->reserve_lun(dev, lunid)) {
> - pr_err("rrpc: lun %u is already allocated\n", lunid);
> - goto err;
> - }
> -
> lun = dev->mt->get_lun(dev, lunid);
> if (!lun) {
> pr_err("rrpc: cannot get lun %d\n", lun->id);
> @@ -1508,6 +1497,7 @@ static void *rrpc_init(struct nvm_dev *dev, struct gendisk *tdisk,
> static struct nvm_tgt_type tt_rrpc = {
> .name = "rrpc",
> .version = {1, 0, 0},
> + .exclusive = 1,
>
> .make_rq = rrpc_make_rq,
> .capacity = rrpc_capacity,
> diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
> index 14c6fa5..1957829 100644
> --- a/include/linux/lightnvm.h
> +++ b/include/linux/lightnvm.h
> @@ -438,6 +438,7 @@ typedef void (nvm_tgt_exit_fn)(void *);
> struct nvm_tgt_type {
> const char *name;
> unsigned int version[3];
> + int exclusive;
>
> /* target entry points */
> nvm_tgt_make_rq_fn *make_rq;
> @@ -487,8 +488,6 @@ typedef int (nvmm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
> typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct nvm_block *, int);
> typedef void (nvmm_mark_blk_fn)(struct nvm_dev *, struct ppa_addr, int);
> typedef struct nvm_lun *(nvmm_get_lun_fn)(struct nvm_dev *, int);
> -typedef int (nvmm_reserve_lun)(struct nvm_dev *, int);
> -typedef void (nvmm_release_lun)(struct nvm_dev *, int);
> typedef void (nvmm_lun_info_print_fn)(struct nvm_dev *);
>
> typedef int (nvmm_get_area_fn)(struct nvm_dev *, sector_t *, sector_t);
> @@ -519,8 +518,6 @@ struct nvmm_type {
>
> /* Configuration management */
> nvmm_get_lun_fn *get_lun;
> - nvmm_reserve_lun *reserve_lun;
> - nvmm_release_lun *release_lun;
>
> /* Statistics */
> nvmm_lun_info_print_fn *lun_info_print;
>
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