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Date: Fri, 5 Feb 2016 12:59:31 +0100
From: Matias Bjørling <mb@...htnvm.io>
To: Wenwei Tao <ww.tao0320@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH 2/3] lightnvm: add a bitmap of luns
On 02/04/2016 12:34 PM, Wenwei Tao wrote:
> Add a bitmap of luns to indicate the status
> of luns: inuse/available. When create targets
> do the necessary check to avoid allocating luns
> that are already allocated.
>
> Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
> ---
> drivers/lightnvm/core.c | 5 ++++
> drivers/lightnvm/gennvm.c | 18 +++++++++++++++
> drivers/lightnvm/rrpc.c | 59 +++++++++++++++++++++++++++++++++++------------
> include/linux/lightnvm.h | 5 ++++
> 4 files changed, 72 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
> index 93c035b..11b8e2d 100644
> --- a/drivers/lightnvm/core.c
> +++ b/drivers/lightnvm/core.c
> @@ -464,6 +464,10 @@ static int nvm_core_init(struct nvm_dev *dev)
> dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls;
>
> dev->total_secs = dev->nr_luns * dev->sec_per_lun;
> + dev->lun_map = kcalloc(BITS_TO_LONGS(dev->nr_luns),
> + sizeof(unsigned long), GFP_KERNEL);
> + if (!dev->lun_map)
> + return -ENOMEM;
> INIT_LIST_HEAD(&dev->online_targets);
> mutex_init(&dev->mlock);
> spin_lock_init(&dev->lock);
> @@ -606,6 +610,7 @@ void nvm_unregister(char *disk_name)
> up_write(&nvm_lock);
>
> nvm_exit(dev);
> + kfree(dev->lun_map);
> kfree(dev);
> }
> EXPORT_SYMBOL(nvm_unregister);
> diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
> index fba3fbd..adc10c2 100644
> --- a/drivers/lightnvm/gennvm.c
> +++ b/drivers/lightnvm/gennvm.c
> @@ -190,6 +190,9 @@ static int gennvm_block_map(u64 slba, u32 nlb, __le64 *entries, void *private)
> lun_id = div_u64(pba, dev->sec_per_lun);
> lun = &gn->luns[lun_id];
>
> + if (!test_bit(lun_id, dev->lun_map))
> + __set_bit(lun_id, dev->lun_map);
> +
> /* Calculate block offset into lun */
> pba = pba - (dev->sec_per_lun * lun_id);
> blk = &lun->vlun.blocks[div_u64(pba, dev->sec_per_blk)];
> @@ -480,10 +483,23 @@ static int gennvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk,
> return nvm_erase_ppa(dev, &addr, 1);
> }
>
> +static int gennvm_reserve_lun(struct nvm_dev *dev, int lunid)
> +{
> + return test_and_set_bit(lunid, dev->lun_map);
> +}
> +
> +static void gennvm_release_lun(struct nvm_dev *dev, int lunid)
> +{
> + WARN_ON(!test_and_clear_bit(lunid, dev->lun_map));
> +}
> +
> static struct nvm_lun *gennvm_get_lun(struct nvm_dev *dev, int lunid)
> {
> struct gen_nvm *gn = dev->mp;
>
> + if (unlikely(lunid >= dev->nr_luns))
> + return NULL;
> +
> return &gn->luns[lunid].vlun;
> }
>
> @@ -525,6 +541,8 @@ static struct nvmm_type gennvm = {
> .erase_blk = gennvm_erase_blk,
>
> .get_lun = gennvm_get_lun,
> + .reserve_lun = gennvm_reserve_lun,
> + .release_lun = gennvm_release_lun,
> .lun_info_print = gennvm_lun_info_print,
>
> .get_area = gennvm_get_area,
> diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
> index 6ce5f73..2bd5789 100644
> --- a/drivers/lightnvm/rrpc.c
> +++ b/drivers/lightnvm/rrpc.c
> @@ -1128,6 +1128,22 @@ 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;
> +
> + if (!rrpc->luns)
> + return;
> +
> + 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);
> + }
> kfree(rrpc->luns);
> }
>
> @@ -1135,7 +1151,7 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
> {
> struct nvm_dev *dev = rrpc->dev;
> struct rrpc_lun *rlun;
> - int i, j;
> + int i, j, ret = -EINVAL;
>
> if (dev->pgs_per_blk > MAX_INVALID_PAGES_STORAGE * BITS_PER_LONG) {
> pr_err("rrpc: number of pages per block too high.");
> @@ -1151,25 +1167,26 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
>
> /* 1:1 mapping */
> for (i = 0; i < rrpc->nr_luns; i++) {
> - struct nvm_lun *lun = dev->mt->get_lun(dev, lun_begin + i);
> + int lunid = lun_begin + i;
> + struct nvm_lun *lun;
>
> - rlun = &rrpc->luns[i];
> - rlun->rrpc = rrpc;
> - rlun->parent = lun;
> - INIT_LIST_HEAD(&rlun->prio_list);
> - INIT_LIST_HEAD(&rlun->open_list);
> - INIT_LIST_HEAD(&rlun->closed_list);
> -
> - INIT_WORK(&rlun->ws_gc, rrpc_lun_gc);
> - spin_lock_init(&rlun->lock);
> + if (dev->mt->reserve_lun(dev, lunid)) {
> + pr_err("rrpc: lun %u is already allocated\n", lunid);
> + goto err;
> + }
>
> - rrpc->total_blocks += dev->blks_per_lun;
> - rrpc->nr_sects += dev->sec_per_lun;
> + lun = dev->mt->get_lun(dev, lunid);
> + if (!lun)
> + goto err;
>
> + rlun = &rrpc->luns[i];
> + rlun->parent = lun;
> rlun->blocks = vzalloc(sizeof(struct rrpc_block) *
> rrpc->dev->blks_per_lun);
> - if (!rlun->blocks)
> + if (!rlun->blocks) {
> + ret = -ENOMEM;
> goto err;
> + }
>
> for (j = 0; j < rrpc->dev->blks_per_lun; j++) {
> struct rrpc_block *rblk = &rlun->blocks[j];
> @@ -1180,11 +1197,23 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
> INIT_LIST_HEAD(&rblk->prio);
> spin_lock_init(&rblk->lock);
> }
> +
> + rlun->rrpc = rrpc;
> + INIT_LIST_HEAD(&rlun->prio_list);
> + INIT_LIST_HEAD(&rlun->open_list);
> + INIT_LIST_HEAD(&rlun->closed_list);
> +
> + INIT_WORK(&rlun->ws_gc, rrpc_lun_gc);
> + spin_lock_init(&rlun->lock);
> +
> + rrpc->total_blocks += dev->blks_per_lun;
> + rrpc->nr_sects += dev->sec_per_lun;
> +
> }
>
> return 0;
> err:
> - return -ENOMEM;
> + return ret;
> }
>
> /* returns 0 on success and stores the beginning address in *begin */
> diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
> index ce58ad5..2a17dc1 100644
> --- a/include/linux/lightnvm.h
> +++ b/include/linux/lightnvm.h
> @@ -342,6 +342,7 @@ struct nvm_dev {
> int nr_luns;
> unsigned max_pages_per_blk;
>
> + unsigned long *lun_map;
> void *ppalist_pool;
>
> struct nvm_id identity;
> @@ -462,6 +463,8 @@ typedef int (nvmm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
> typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct nvm_block *,
> unsigned long);
> 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);
> @@ -488,6 +491,8 @@ 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;
>
Thanks, applied for 4.6. I added an extra kfree(dev->lun_map) at the end
of nvm_core_init to make sure that we freed the lun_map if other
allocations fails in initialization.
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