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Subject: Re: [PATCH] lightnvm: pblk: refactor init/exit sequences
To:     =?UTF-8?Q?Javier_Gonz=c3=a1lez?= <javier@javigon.com>
Cc:     linux-block@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
        Dan Carpenter <dan.carpenter@oracle.com>
References: <1519919998-20829-1-git-send-email-javier@cnexlabs.com>
 <1519919998-20829-2-git-send-email-javier@cnexlabs.com>
 <8586a9e4-c76f-e38a-edcf-201cc7e2ddfb@lightnvm.io>
 <ED151D27-0D29-451F-9E9D-155E6C8C6224@javigon.com>
 <64fdacf9-fc89-48fb-4a8d-a8dada708329@lightnvm.io>
 <12DCD7A9-01CB-4CCE-8F6A-6B892056F5F0@javigon.com>
 <d6f0117f-0de5-86d6-b568-5454df627f50@lightnvm.io>
 <5D681B87-FFE9-4E34-9D11-96CEFB6FA40B@javigon.com>
From:   =?UTF-8?Q?Matias_Bj=c3=b8rling?= <mb@lightnvm.io>
Message-ID: <6b9fe4ed-6f09-ab3b-ff5e-6ba66be10c6d@lightnvm.io>
Date:   Mon, 5 Mar 2018 19:27:29 +0100
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On 03/05/2018 03:18 PM, Javier González wrote:
>> On 5 Mar 2018, at 15.16, Matias Bjørling <mb@lightnvm.io> wrote:
>>
>> On 03/05/2018 02:45 PM, Javier González wrote:
>>>> On 5 Mar 2018, at 14.38, Matias Bjørling <mb@lightnvm.io> wrote:
>>>>
>>>> On 03/01/2018 08:29 PM, Javier González wrote:
>>>>>> On 1 Mar 2018, at 19.49, Matias Bjørling <mb@lightnvm.io> wrote:
>>>>>>
>>>>>> On 03/01/2018 04:59 PM, Javier González wrote:
>>>>>>> Refactor init and exit sequences to eliminate dependencies among init
>>>>>>> modules and improve readability.
>>>>>>> Signed-off-by: Javier González <javier@cnexlabs.com>
>>>>>>> ---
>>>>>>>   drivers/lightnvm/pblk-init.c | 415 +++++++++++++++++++++----------------------
>>>>>>>   1 file changed, 206 insertions(+), 209 deletions(-)
>>>>>>> diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
>>>>>>> index 25fc70ca07f7..87c390667dd6 100644
>>>>>>> --- a/drivers/lightnvm/pblk-init.c
>>>>>>> +++ b/drivers/lightnvm/pblk-init.c
>>>>>>> @@ -103,7 +103,40 @@ static void pblk_l2p_free(struct pblk *pblk)
>>>>>>>   	vfree(pblk->trans_map);
>>>>>>>   }
>>>>>>>   -static int pblk_l2p_init(struct pblk *pblk)
>>>>>>> +static int pblk_l2p_recover(struct pblk *pblk, bool factory_init)
>>>>>>> +{
>>>>>>> +	struct pblk_line *line = NULL;
>>>>>>> +
>>>>>>> +	if (factory_init) {
>>>>>>> +		pblk_setup_uuid(pblk);
>>>>>>> +	} else {
>>>>>>> +		line = pblk_recov_l2p(pblk);
>>>>>>> +		if (IS_ERR(line)) {
>>>>>>> +			pr_err("pblk: could not recover l2p table\n");
>>>>>>> +			return -EFAULT;
>>>>>>> +		}
>>>>>>> +	}
>>>>>>> +
>>>>>>> +#ifdef CONFIG_NVM_DEBUG
>>>>>>> +	pr_info("pblk init: L2P CRC: %x\n", pblk_l2p_crc(pblk));
>>>>>>> +#endif
>>>>>>> +
>>>>>>> +	/* Free full lines directly as GC has not been started yet */
>>>>>>> +	pblk_gc_free_full_lines(pblk);
>>>>>>> +
>>>>>>> +	if (!line) {
>>>>>>> +		/* Configure next line for user data */
>>>>>>> +		line = pblk_line_get_first_data(pblk);
>>>>>>> +		if (!line) {
>>>>>>> +			pr_err("pblk: line list corrupted\n");
>>>>>>> +			return -EFAULT;
>>>>>>> +		}
>>>>>>> +	}
>>>>>>> +
>>>>>>> +	return 0;
>>>>>>> +}
>>>>>>> +
>>>>>>> +static int pblk_l2p_init(struct pblk *pblk, bool factory_init)
>>>>>>>   {
>>>>>>>   	sector_t i;
>>>>>>>   	struct ppa_addr ppa;
>>>>>>> @@ -119,7 +152,7 @@ static int pblk_l2p_init(struct pblk *pblk)
>>>>>>>   	for (i = 0; i < pblk->rl.nr_secs; i++)
>>>>>>>   		pblk_trans_map_set(pblk, i, ppa);
>>>>>>>   -	return 0;
>>>>>>> +	return pblk_l2p_recover(pblk, factory_init);
>>>>>>>   }
>>>>>>>     static void pblk_rwb_free(struct pblk *pblk)
>>>>>>> @@ -159,7 +192,13 @@ static int pblk_set_ppaf(struct pblk *pblk)
>>>>>>>   	struct nvm_tgt_dev *dev = pblk->dev;
>>>>>>>   	struct nvm_geo *geo = &dev->geo;
>>>>>>>   	struct nvm_addr_format ppaf = geo->ppaf;
>>>>>>> -	int power_len;
>>>>>>> +	int mod, power_len;
>>>>>>> +
>>>>>>> +	div_u64_rem(geo->sec_per_chk, pblk->min_write_pgs, &mod);
>>>>>>> +	if (mod) {
>>>>>>> +		pr_err("pblk: bad configuration of sectors/pages\n");
>>>>>>> +		return -EINVAL;
>>>>>>> +	}
>>>>>>>     	/* Re-calculate channel and lun format to adapt to configuration */
>>>>>>>   	power_len = get_count_order(geo->nr_chnls);
>>>>>>> @@ -252,12 +291,39 @@ static int pblk_core_init(struct pblk *pblk)
>>>>>>>   {
>>>>>>>   	struct nvm_tgt_dev *dev = pblk->dev;
>>>>>>>   	struct nvm_geo *geo = &dev->geo;
>>>>>>> +	int max_write_ppas;
>>>>>>> +
>>>>>>> +	atomic64_set(&pblk->user_wa, 0);
>>>>>>> +	atomic64_set(&pblk->pad_wa, 0);
>>>>>>> +	atomic64_set(&pblk->gc_wa, 0);
>>>>>>> +	pblk->user_rst_wa = 0;
>>>>>>> +	pblk->pad_rst_wa = 0;
>>>>>>> +	pblk->gc_rst_wa = 0;
>>>>>>> +
>>>>>>> +	atomic64_set(&pblk->nr_flush, 0);
>>>>>>> +	pblk->nr_flush_rst = 0;
>>>>>>>     	pblk->pgs_in_buffer = NVM_MEM_PAGE_WRITE * geo->sec_per_pg *
>>>>>>>   						geo->nr_planes * geo->all_luns;
>>>>>>>   +	pblk->min_write_pgs = geo->sec_per_pl * (geo->sec_size / PAGE_SIZE);
>>>>>>> +	max_write_ppas = pblk->min_write_pgs * geo->all_luns;
>>>>>>> +	pblk->max_write_pgs = min_t(int, max_write_ppas, NVM_MAX_VLBA);
>>>>>>> +	pblk_set_sec_per_write(pblk, pblk->min_write_pgs);
>>>>>>> +
>>>>>>> +	if (pblk->max_write_pgs > PBLK_MAX_REQ_ADDRS) {
>>>>>>> +		pr_err("pblk: vector list too big(%u > %u)\n",
>>>>>>> +				pblk->max_write_pgs, PBLK_MAX_REQ_ADDRS);
>>>>>>> +		return -EINVAL;
>>>>>>> +	}
>>>>>>> +
>>>>>>> +	pblk->pad_dist = kzalloc((pblk->min_write_pgs - 1) * sizeof(atomic64_t),
>>>>>>> +								GFP_KERNEL);
>>>>>>> +	if (!pblk->pad_dist)
>>>>>>> +		return -ENOMEM;
>>>>>>> +
>>>>>>>   	if (pblk_init_global_caches(pblk))
>>>>>>> -		return -ENOMEM;
>>>>>>> +		goto fail_free_pad_dist;
>>>>>>>     	/* Internal bios can be at most the sectors signaled by the device. */
>>>>>>>   	pblk->page_bio_pool = mempool_create_page_pool(NVM_MAX_VLBA, 0);
>>>>>>> @@ -307,10 +373,8 @@ static int pblk_core_init(struct pblk *pblk)
>>>>>>>   	if (pblk_set_ppaf(pblk))
>>>>>>>   		goto free_r_end_wq;
>>>>>>>   -	if (pblk_rwb_init(pblk))
>>>>>>> -		goto free_r_end_wq;
>>>>>>> -
>>>>>>>   	INIT_LIST_HEAD(&pblk->compl_list);
>>>>>>> +
>>>>>>>   	return 0;
>>>>>>>     free_r_end_wq:
>>>>>>> @@ -333,6 +397,8 @@ static int pblk_core_init(struct pblk *pblk)
>>>>>>>   	mempool_destroy(pblk->page_bio_pool);
>>>>>>>   free_global_caches:
>>>>>>>   	pblk_free_global_caches(pblk);
>>>>>>> +fail_free_pad_dist:
>>>>>>> +	kfree(pblk->pad_dist);
>>>>>>>   	return -ENOMEM;
>>>>>>>   }
>>>>>>>   @@ -354,14 +420,8 @@ static void pblk_core_free(struct pblk *pblk)
>>>>>>>   	mempool_destroy(pblk->e_rq_pool);
>>>>>>>   	mempool_destroy(pblk->w_rq_pool);
>>>>>>>   -	pblk_rwb_free(pblk);
>>>>>>> -
>>>>>>>   	pblk_free_global_caches(pblk);
>>>>>>> -}
>>>>>>> -
>>>>>>> -static void pblk_luns_free(struct pblk *pblk)
>>>>>>> -{
>>>>>>> -	kfree(pblk->luns);
>>>>>>> +	kfree(pblk->pad_dist);
>>>>>>>   }
>>>>>>>     static void pblk_line_mg_free(struct pblk *pblk)
>>>>>>> @@ -378,8 +438,6 @@ static void pblk_line_mg_free(struct pblk *pblk)
>>>>>>>   		pblk_mfree(l_mg->eline_meta[i]->buf, l_mg->emeta_alloc_type);
>>>>>>>   		kfree(l_mg->eline_meta[i]);
>>>>>>>   	}
>>>>>>> -
>>>>>>> -	kfree(pblk->lines);
>>>>>>>   }
>>>>>>>     static void pblk_line_meta_free(struct pblk_line *line)
>>>>>>> @@ -402,6 +460,11 @@ static void pblk_lines_free(struct pblk *pblk)
>>>>>>>   		pblk_line_meta_free(line);
>>>>>>>   	}
>>>>>>>   	spin_unlock(&l_mg->free_lock);
>>>>>>> +
>>>>>>> +	pblk_line_mg_free(pblk);
>>>>>>> +
>>>>>>> +	kfree(pblk->luns);
>>>>>>> +	kfree(pblk->lines);
>>>>>>>   }
>>>>>>>     static int pblk_bb_get_tbl(struct nvm_tgt_dev *dev, struct pblk_lun *rlun,
>>>>>>> @@ -476,7 +539,7 @@ static int pblk_bb_line(struct pblk *pblk, struct pblk_line *line,
>>>>>>>   	return bb_cnt;
>>>>>>>   }
>>>>>>>   -static int pblk_luns_init(struct pblk *pblk, struct ppa_addr *luns)
>>>>>>> +static int pblk_luns_init(struct pblk *pblk)
>>>>>>>   {
>>>>>>>   	struct nvm_tgt_dev *dev = pblk->dev;
>>>>>>>   	struct nvm_geo *geo = &dev->geo;
>>>>>>> @@ -501,7 +564,7 @@ static int pblk_luns_init(struct pblk *pblk, struct ppa_addr *luns)
>>>>>>>   		int lunid = lun_raw + ch * geo->nr_luns;
>>>>>>>     		rlun = &pblk->luns[i];
>>>>>>> -		rlun->bppa = luns[lunid];
>>>>>>> +		rlun->bppa = dev->luns[lunid];
>>>>>>>     		sema_init(&rlun->wr_sem, 1);
>>>>>>>   	}
>>>>>>> @@ -509,38 +572,6 @@ static int pblk_luns_init(struct pblk *pblk, struct ppa_addr *luns)
>>>>>>>   	return 0;
>>>>>>>   }
>>>>>>>   -static int pblk_lines_configure(struct pblk *pblk, int flags)
>>>>>>> -{
>>>>>>> -	struct pblk_line *line = NULL;
>>>>>>> -	int ret = 0;
>>>>>>> -
>>>>>>> -	if (!(flags & NVM_TARGET_FACTORY)) {
>>>>>>> -		line = pblk_recov_l2p(pblk);
>>>>>>> -		if (IS_ERR(line)) {
>>>>>>> -			pr_err("pblk: could not recover l2p table\n");
>>>>>>> -			ret = -EFAULT;
>>>>>>> -		}
>>>>>>> -	}
>>>>>>> -
>>>>>>> -#ifdef CONFIG_NVM_DEBUG
>>>>>>> -	pr_info("pblk init: L2P CRC: %x\n", pblk_l2p_crc(pblk));
>>>>>>> -#endif
>>>>>>> -
>>>>>>> -	/* Free full lines directly as GC has not been started yet */
>>>>>>> -	pblk_gc_free_full_lines(pblk);
>>>>>>> -
>>>>>>> -	if (!line) {
>>>>>>> -		/* Configure next line for user data */
>>>>>>> -		line = pblk_line_get_first_data(pblk);
>>>>>>> -		if (!line) {
>>>>>>> -			pr_err("pblk: line list corrupted\n");
>>>>>>> -			ret = -EFAULT;
>>>>>>> -		}
>>>>>>> -	}
>>>>>>> -
>>>>>>> -	return ret;
>>>>>>> -}
>>>>>>> -
>>>>>>>   /* See comment over struct line_emeta definition */
>>>>>>>   static unsigned int calc_emeta_len(struct pblk *pblk)
>>>>>>>   {
>>>>>>> @@ -606,11 +637,70 @@ static void pblk_set_provision(struct pblk *pblk, long nr_free_blks)
>>>>>>>   	atomic_set(&pblk->rl.free_user_blocks, nr_free_blks);
>>>>>>>   }
>>>>>>>   -static int pblk_lines_alloc_metadata(struct pblk *pblk)
>>>>>>> +static int pblk_setup_line_meta(struct pblk *pblk, struct pblk_line *line,
>>>>>>> +				void *chunk_log, long *nr_bad_blks)
>>>>>>>   {
>>>>>>> +	struct pblk_line_meta *lm = &pblk->lm;
>>>>>>> +
>>>>>>> +	line->blk_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
>>>>>>> +	if (!line->blk_bitmap)
>>>>>>> +		return -ENOMEM;
>>>>>>> +
>>>>>>> +	line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
>>>>>>> +	if (!line->erase_bitmap) {
>>>>>>> +		kfree(line->blk_bitmap);
>>>>>>> +		return -ENOMEM;
>>>>>>> +	}
>>>>>>> +
>>>>>>> +	*nr_bad_blks = pblk_bb_line(pblk, line, chunk_log, lm->blk_per_line);
>>>>>>> +
>>>>>>> +	return 0;
>>>>>>> +}
>>>>>>> +
>>>>>>> +static int pblk_line_mg_init(struct pblk *pblk)
>>>>>>> +{
>>>>>>> +	struct nvm_tgt_dev *dev = pblk->dev;
>>>>>>> +	struct nvm_geo *geo = &dev->geo;
>>>>>>>   	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
>>>>>>>   	struct pblk_line_meta *lm = &pblk->lm;
>>>>>>> -	int i;
>>>>>>> +	int i, bb_distance;
>>>>>>> +
>>>>>>> +	l_mg->nr_lines = geo->nr_chks;
>>>>>>> +	l_mg->log_line = l_mg->data_line = NULL;
>>>>>>> +	l_mg->l_seq_nr = l_mg->d_seq_nr = 0;
>>>>>>> +	l_mg->nr_free_lines = 0;
>>>>>>> +	bitmap_zero(&l_mg->meta_bitmap, PBLK_DATA_LINES);
>>>>>>> +
>>>>>>> +	INIT_LIST_HEAD(&l_mg->free_list);
>>>>>>> +	INIT_LIST_HEAD(&l_mg->corrupt_list);
>>>>>>> +	INIT_LIST_HEAD(&l_mg->bad_list);
>>>>>>> +	INIT_LIST_HEAD(&l_mg->gc_full_list);
>>>>>>> +	INIT_LIST_HEAD(&l_mg->gc_high_list);
>>>>>>> +	INIT_LIST_HEAD(&l_mg->gc_mid_list);
>>>>>>> +	INIT_LIST_HEAD(&l_mg->gc_low_list);
>>>>>>> +	INIT_LIST_HEAD(&l_mg->gc_empty_list);
>>>>>>> +
>>>>>>> +	INIT_LIST_HEAD(&l_mg->emeta_list);
>>>>>>> +
>>>>>>> +	l_mg->gc_lists[0] = &l_mg->gc_high_list;
>>>>>>> +	l_mg->gc_lists[1] = &l_mg->gc_mid_list;
>>>>>>> +	l_mg->gc_lists[2] = &l_mg->gc_low_list;
>>>>>>> +
>>>>>>> +	spin_lock_init(&l_mg->free_lock);
>>>>>>> +	spin_lock_init(&l_mg->close_lock);
>>>>>>> +	spin_lock_init(&l_mg->gc_lock);
>>>>>>> +
>>>>>>> +	l_mg->vsc_list = kcalloc(l_mg->nr_lines, sizeof(__le32), GFP_KERNEL);
>>>>>>> +	if (!l_mg->vsc_list)
>>>>>>> +		goto fail;
>>>>>>> +
>>>>>>> +	l_mg->bb_template = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
>>>>>>> +	if (!l_mg->bb_template)
>>>>>>> +		goto fail_free_vsc_list;
>>>>>>> +
>>>>>>> +	l_mg->bb_aux = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
>>>>>>> +	if (!l_mg->bb_aux)
>>>>>>> +		goto fail_free_bb_template;
>>>>>>>     	/* smeta is always small enough to fit on a kmalloc memory allocation,
>>>>>>>   	 * emeta depends on the number of LUNs allocated to the pblk instance
>>>>>>> @@ -656,13 +746,13 @@ static int pblk_lines_alloc_metadata(struct pblk *pblk)
>>>>>>>   		}
>>>>>>>   	}
>>>>>>>   -	l_mg->vsc_list = kcalloc(l_mg->nr_lines, sizeof(__le32), GFP_KERNEL);
>>>>>>> -	if (!l_mg->vsc_list)
>>>>>>> -		goto fail_free_emeta;
>>>>>>> -
>>>>>>>   	for (i = 0; i < l_mg->nr_lines; i++)
>>>>>>>   		l_mg->vsc_list[i] = cpu_to_le32(EMPTY_ENTRY);
>>>>>>>   +	bb_distance = (geo->all_luns) * geo->ws_opt;
>>>>>>> +	for (i = 0; i < lm->sec_per_line; i += bb_distance)
>>>>>>> +		bitmap_set(l_mg->bb_template, i, geo->ws_opt);
>>>>>>> +
>>>>>>>   	return 0;
>>>>>>>     fail_free_emeta:
>>>>>>> @@ -673,69 +763,25 @@ static int pblk_lines_alloc_metadata(struct pblk *pblk)
>>>>>>>   			kfree(l_mg->eline_meta[i]->buf);
>>>>>>>   		kfree(l_mg->eline_meta[i]);
>>>>>>>   	}
>>>>>>> -
>>>>>>>   fail_free_smeta:
>>>>>>>   	for (i = 0; i < PBLK_DATA_LINES; i++)
>>>>>>>   		kfree(l_mg->sline_meta[i]);
>>>>>>> -
>>>>>>> +	kfree(l_mg->bb_aux);
>>>>>>> +fail_free_bb_template:
>>>>>>> +	kfree(l_mg->bb_template);
>>>>>>> +fail_free_vsc_list:
>>>>>>> +	kfree(l_mg->vsc_list);
>>>>>>> +fail:
>>>>>>>   	return -ENOMEM;
>>>>>>>   }
>>>>>>>   -static int pblk_setup_line_meta(struct pblk *pblk, struct pblk_line *line,
>>>>>>> -				void *chunk_log, long *nr_bad_blks)
>>>>>>> -{
>>>>>>> -	struct pblk_line_meta *lm = &pblk->lm;
>>>>>>> -
>>>>>>> -	line->blk_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
>>>>>>> -	if (!line->blk_bitmap)
>>>>>>> -		return -ENOMEM;
>>>>>>> -
>>>>>>> -	line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
>>>>>>> -	if (!line->erase_bitmap) {
>>>>>>> -		kfree(line->blk_bitmap);
>>>>>>> -		return -ENOMEM;
>>>>>>> -	}
>>>>>>> -
>>>>>>> -	*nr_bad_blks = pblk_bb_line(pblk, line, chunk_log, lm->blk_per_line);
>>>>>>> -
>>>>>>> -	return 0;
>>>>>>> -}
>>>>>>> -
>>>>>>> -static int pblk_lines_init(struct pblk *pblk)
>>>>>>> +static int pblk_line_meta_init(struct pblk *pblk)
>>>>>>>   {
>>>>>>>   	struct nvm_tgt_dev *dev = pblk->dev;
>>>>>>>   	struct nvm_geo *geo = &dev->geo;
>>>>>>> -	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
>>>>>>>   	struct pblk_line_meta *lm = &pblk->lm;
>>>>>>> -	struct pblk_line *line;
>>>>>>> -	void *chunk_log;
>>>>>>>   	unsigned int smeta_len, emeta_len;
>>>>>>> -	long nr_bad_blks = 0, nr_free_blks = 0;
>>>>>>> -	int bb_distance, max_write_ppas, mod;
>>>>>>> -	int i, ret;
>>>>>>> -
>>>>>>> -	pblk->min_write_pgs = geo->sec_per_pl * (geo->sec_size / PAGE_SIZE);
>>>>>>> -	max_write_ppas = pblk->min_write_pgs * geo->all_luns;
>>>>>>> -	pblk->max_write_pgs = min_t(int, max_write_ppas, NVM_MAX_VLBA);
>>>>>>> -	pblk_set_sec_per_write(pblk, pblk->min_write_pgs);
>>>>>>> -
>>>>>>> -	if (pblk->max_write_pgs > PBLK_MAX_REQ_ADDRS) {
>>>>>>> -		pr_err("pblk: vector list too big(%u > %u)\n",
>>>>>>> -				pblk->max_write_pgs, PBLK_MAX_REQ_ADDRS);
>>>>>>> -		return -EINVAL;
>>>>>>> -	}
>>>>>>> -
>>>>>>> -	div_u64_rem(geo->sec_per_chk, pblk->min_write_pgs, &mod);
>>>>>>> -	if (mod) {
>>>>>>> -		pr_err("pblk: bad configuration of sectors/pages\n");
>>>>>>> -		return -EINVAL;
>>>>>>> -	}
>>>>>>> -
>>>>>>> -	l_mg->nr_lines = geo->nr_chks;
>>>>>>> -	l_mg->log_line = l_mg->data_line = NULL;
>>>>>>> -	l_mg->l_seq_nr = l_mg->d_seq_nr = 0;
>>>>>>> -	l_mg->nr_free_lines = 0;
>>>>>>> -	bitmap_zero(&l_mg->meta_bitmap, PBLK_DATA_LINES);
>>>>>>> +	int i;
>>>>>>>     	lm->sec_per_line = geo->sec_per_chk * geo->all_luns;
>>>>>>>   	lm->blk_per_line = geo->all_luns;
>>>>>>> @@ -787,58 +833,43 @@ static int pblk_lines_init(struct pblk *pblk)
>>>>>>>   		return -EINVAL;
>>>>>>>   	}
>>>>>>>   -	ret = pblk_lines_alloc_metadata(pblk);
>>>>>>> +	return 0;
>>>>>>> +}
>>>>>>> +
>>>>>>> +static int pblk_lines_init(struct pblk *pblk)
>>>>>>> +{
>>>>>>> +	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
>>>>>>> +	struct pblk_line_meta *lm = &pblk->lm;
>>>>>>> +	struct pblk_line *line;
>>>>>>> +	void *chunk_log;
>>>>>>> +	long nr_bad_blks = 0, nr_free_blks = 0;
>>>>>>> +	int i, ret;
>>>>>>> +
>>>>>>> +	ret = pblk_line_meta_init(pblk);
>>>>>>> +	if (ret)
>>>>>>> +		return ret;
>>>>>>> +
>>>>>>> +	ret = pblk_line_mg_init(pblk);
>>>>>>>   	if (ret)
>>>>>>>   		return ret;
>>>>>>>   -	l_mg->bb_template = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
>>>>>>> -	if (!l_mg->bb_template) {
>>>>>>> -		ret = -ENOMEM;
>>>>>>> +	ret = pblk_luns_init(pblk);
>>>>>>> +	if (ret)
>>>>>>>   		goto fail_free_meta;
>>>>>>> -	}
>>>>>>> -
>>>>>>> -	l_mg->bb_aux = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
>>>>>>> -	if (!l_mg->bb_aux) {
>>>>>>> -		ret = -ENOMEM;
>>>>>>> -		goto fail_free_bb_template;
>>>>>>> -	}
>>>>>>> -
>>>>>>> -	bb_distance = (geo->all_luns) * geo->sec_per_pl;
>>>>>>> -	for (i = 0; i < lm->sec_per_line; i += bb_distance)
>>>>>>> -		bitmap_set(l_mg->bb_template, i, geo->sec_per_pl);
>>>>>>> -
>>>>>>> -	INIT_LIST_HEAD(&l_mg->free_list);
>>>>>>> -	INIT_LIST_HEAD(&l_mg->corrupt_list);
>>>>>>> -	INIT_LIST_HEAD(&l_mg->bad_list);
>>>>>>> -	INIT_LIST_HEAD(&l_mg->gc_full_list);
>>>>>>> -	INIT_LIST_HEAD(&l_mg->gc_high_list);
>>>>>>> -	INIT_LIST_HEAD(&l_mg->gc_mid_list);
>>>>>>> -	INIT_LIST_HEAD(&l_mg->gc_low_list);
>>>>>>> -	INIT_LIST_HEAD(&l_mg->gc_empty_list);
>>>>>>> -
>>>>>>> -	INIT_LIST_HEAD(&l_mg->emeta_list);
>>>>>>> -
>>>>>>> -	l_mg->gc_lists[0] = &l_mg->gc_high_list;
>>>>>>> -	l_mg->gc_lists[1] = &l_mg->gc_mid_list;
>>>>>>> -	l_mg->gc_lists[2] = &l_mg->gc_low_list;
>>>>>>> -
>>>>>>> -	spin_lock_init(&l_mg->free_lock);
>>>>>>> -	spin_lock_init(&l_mg->close_lock);
>>>>>>> -	spin_lock_init(&l_mg->gc_lock);
>>>>>>> -
>>>>>>> -	pblk->lines = kcalloc(l_mg->nr_lines, sizeof(struct pblk_line),
>>>>>>> -								GFP_KERNEL);
>>>>>>> -	if (!pblk->lines) {
>>>>>>> -		ret = -ENOMEM;
>>>>>>> -		goto fail_free_bb_aux;
>>>>>>> -	}
>>>>>>>     	chunk_log = pblk_bb_get_log(pblk);
>>>>>>>   	if (IS_ERR(chunk_log)) {
>>>>>>>   		pr_err("pblk: could not get bad block log (%lu)\n",
>>>>>>>   							PTR_ERR(chunk_log));
>>>>>>>   		ret = PTR_ERR(chunk_log);
>>>>>>> -		goto fail_free_lines;
>>>>>>> +		goto fail_free_luns;
>>>>>>> +	}
>>>>>>> +
>>>>>>> +	pblk->lines = kcalloc(l_mg->nr_lines, sizeof(struct pblk_line),
>>>>>>> +								GFP_KERNEL);
>>>>>>> +	if (!pblk->lines) {
>>>>>>> +		ret = -ENOMEM;
>>>>>>> +		goto fail_free_chunk_log;
>>>>>>>   	}
>>>>>>>     	for (i = 0; i < l_mg->nr_lines; i++) {
>>>>>>> @@ -856,7 +887,7 @@ static int pblk_lines_init(struct pblk *pblk)
>>>>>>>     		ret = pblk_setup_line_meta(pblk, line, chunk_log, &nr_bad_blks);
>>>>>>>   		if (ret)
>>>>>>> -			goto fail_free_chunk_log;
>>>>>>> +			goto fail_free_lines;
>>>>>>>     		chk_in_line = lm->blk_per_line - nr_bad_blks;
>>>>>>>   		if (nr_bad_blks < 0 || nr_bad_blks > lm->blk_per_line ||
>>>>>>> @@ -878,16 +909,14 @@ static int pblk_lines_init(struct pblk *pblk)
>>>>>>>   	kfree(chunk_log);
>>>>>>>   	return 0;
>>>>>>>   -fail_free_chunk_log:
>>>>>>> -	kfree(chunk_log);
>>>>>>> +fail_free_lines:
>>>>>>>   	while (--i >= 0)
>>>>>>>   		pblk_line_meta_free(&pblk->lines[i]);
>>>>>>> -fail_free_lines:
>>>>>>>   	kfree(pblk->lines);
>>>>>>> -fail_free_bb_aux:
>>>>>>> -	kfree(l_mg->bb_aux);
>>>>>>> -fail_free_bb_template:
>>>>>>> -	kfree(l_mg->bb_template);
>>>>>>> +fail_free_chunk_log:
>>>>>>> +	kfree(chunk_log);
>>>>>>> +fail_free_luns:
>>>>>>> +	kfree(pblk->luns);
>>>>>>>   fail_free_meta:
>>>>>>>   	pblk_line_mg_free(pblk);
>>>>>>>   @@ -930,12 +959,10 @@ static void pblk_writer_stop(struct pblk *pblk)
>>>>>>>     static void pblk_free(struct pblk *pblk)
>>>>>>>   {
>>>>>>> -	pblk_luns_free(pblk);
>>>>>>>   	pblk_lines_free(pblk);
>>>>>>> -	kfree(pblk->pad_dist);
>>>>>>> -	pblk_line_mg_free(pblk);
>>>>>>> -	pblk_core_free(pblk);
>>>>>>>   	pblk_l2p_free(pblk);
>>>>>>> +	pblk_rwb_free(pblk);
>>>>>>> +	pblk_core_free(pblk);
>>>>>>>     	kfree(pblk);
>>>>>>>   }
>>>>>>> @@ -1000,19 +1027,6 @@ static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
>>>>>>>   	spin_lock_init(&pblk->trans_lock);
>>>>>>>   	spin_lock_init(&pblk->lock);
>>>>>>>   -	if (flags & NVM_TARGET_FACTORY)
>>>>>>> -		pblk_setup_uuid(pblk);
>>>>>>> -
>>>>>>> -	atomic64_set(&pblk->user_wa, 0);
>>>>>>> -	atomic64_set(&pblk->pad_wa, 0);
>>>>>>> -	atomic64_set(&pblk->gc_wa, 0);
>>>>>>> -	pblk->user_rst_wa = 0;
>>>>>>> -	pblk->pad_rst_wa = 0;
>>>>>>> -	pblk->gc_rst_wa = 0;
>>>>>>> -
>>>>>>> -	atomic64_set(&pblk->nr_flush, 0);
>>>>>>> -	pblk->nr_flush_rst = 0;
>>>>>>> -
>>>>>>>   #ifdef CONFIG_NVM_DEBUG
>>>>>>>   	atomic_long_set(&pblk->inflight_writes, 0);
>>>>>>>   	atomic_long_set(&pblk->padded_writes, 0);
>>>>>>> @@ -1036,48 +1050,35 @@ static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
>>>>>>>   	atomic_long_set(&pblk->write_failed, 0);
>>>>>>>   	atomic_long_set(&pblk->erase_failed, 0);
>>>>>>>   -	ret = pblk_luns_init(pblk, dev->luns);
>>>>>>> -	if (ret) {
>>>>>>> -		pr_err("pblk: could not initialize luns\n");
>>>>>>> -		goto fail;
>>>>>>> -	}
>>>>>>> -
>>>>>>> -	ret = pblk_lines_init(pblk);
>>>>>>> -	if (ret) {
>>>>>>> -		pr_err("pblk: could not initialize lines\n");
>>>>>>> -		goto fail_free_luns;
>>>>>>> -	}
>>>>>>> -
>>>>>>> -	pblk->pad_dist = kzalloc((pblk->min_write_pgs - 1) * sizeof(atomic64_t),
>>>>>>> -				 GFP_KERNEL);
>>>>>>> -	if (!pblk->pad_dist) {
>>>>>>> -		ret = -ENOMEM;
>>>>>>> -		goto fail_free_line_meta;
>>>>>>> -	}
>>>>>>> -
>>>>>>>   	ret = pblk_core_init(pblk);
>>>>>>>   	if (ret) {
>>>>>>>   		pr_err("pblk: could not initialize core\n");
>>>>>>> -		goto fail_free_pad_dist;
>>>>>>> +		goto fail;
>>>>>>>   	}
>>>>>>>   -	ret = pblk_l2p_init(pblk);
>>>>>>> +	ret = pblk_lines_init(pblk);
>>>>>>>   	if (ret) {
>>>>>>> -		pr_err("pblk: could not initialize maps\n");
>>>>>>> +		pr_err("pblk: could not initialize lines\n");
>>>>>>>   		goto fail_free_core;
>>>>>>>   	}
>>>>>>>   -	ret = pblk_lines_configure(pblk, flags);
>>>>>>> +	ret = pblk_rwb_init(pblk);
>>>>>>>   	if (ret) {
>>>>>>> -		pr_err("pblk: could not configure lines\n");
>>>>>>> -		goto fail_free_l2p;
>>>>>>> +		pr_err("pblk: could not initialize write buffer\n");
>>>>>>> +		goto fail_free_lines;
>>>>>>> +	}
>>>>>>> +
>>>>>>> +	ret = pblk_l2p_init(pblk, flags & NVM_TARGET_FACTORY);
>>>>>>> +	if (ret) {
>>>>>>> +		pr_err("pblk: could not initialize maps\n");
>>>>>>> +		goto fail_free_rwb;
>>>>>>>   	}
>>>>>>>     	ret = pblk_writer_init(pblk);
>>>>>>>   	if (ret) {
>>>>>>>   		if (ret != -EINTR)
>>>>>>>   			pr_err("pblk: could not initialize write thread\n");
>>>>>>> -		goto fail_free_lines;
>>>>>>> +		goto fail_free_l2p;
>>>>>>>   	}
>>>>>>>     	ret = pblk_gc_init(pblk);
>>>>>>> @@ -1112,18 +1113,14 @@ static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
>>>>>>>     fail_stop_writer:
>>>>>>>   	pblk_writer_stop(pblk);
>>>>>>> -fail_free_lines:
>>>>>>> -	pblk_lines_free(pblk);
>>>>>>>   fail_free_l2p:
>>>>>>>   	pblk_l2p_free(pblk);
>>>>>>> +fail_free_rwb:
>>>>>>> +	pblk_rwb_free(pblk);
>>>>>>> +fail_free_lines:
>>>>>>> +	pblk_lines_free(pblk);
>>>>>>>   fail_free_core:
>>>>>>>   	pblk_core_free(pblk);
>>>>>>> -fail_free_pad_dist:
>>>>>>> -	kfree(pblk->pad_dist);
>>>>>>> -fail_free_line_meta:
>>>>>>> -	pblk_line_mg_free(pblk);
>>>>>>> -fail_free_luns:
>>>>>>> -	pblk_luns_free(pblk);
>>>>>>>   fail:
>>>>>>>   	kfree(pblk);
>>>>>>>   	return ERR_PTR(ret);
>>>>>>
>>>>>> Thanks. I'm not able to squash it without conflict. Is it based on for-4.17/core?
>>>>> Yes, it's based on for-4.17/core, but I can see a small conflict due to
>>>>> the patches applied in the middle of these two. How do you want to do
>>>>> it? We can keep them separately, or do a rebase on the current patches.
>>>>
>>>> This is all a bit of a mess- Can you send a fix I can apply that fixes
>>>> up the 0-day, and then this larger patch can be applied afterwards?
>>>> (e.g., before at after your other patches)
>>> Not really. The problem is that the original refactoring for the bad
>>> block table was a bandage on the init/exit sequence problem. The
>>> init/ext patch is the one that does it properly.
>>> What we can do, since this is only in your tree, is rebase and pull the
>>> bad block patch up and then merge with init/exit. This way we fix the
>>> original problem and the introduced double free is non-existing.
>>> I can do the rebasing this evening and put it in a different branch you
>>> can review.
>>
>> No thanks. I fixed it up with this:
>>
>> diff --git i/drivers/lightnvm/pblk-init.c w/drivers/lightnvm/pblk-init.c
>> index a2b54a88968b..c31e24aabc18 100644
>> --- i/drivers/lightnvm/pblk-init.c
>> +++ w/drivers/lightnvm/pblk-init.c
>> @@ -838,7 +838,7 @@ static int pblk_lines_init(struct pblk *pblk)
>>                 pr_err("pblk: could not get bad block log (%lu)\n",
>> PTR_ERR(chunk_log));
>>                 ret = PTR_ERR(chunk_log);
>> -               goto fail_free_lines;
>> +               goto fail_free_bb_aux;
>>         }
>>
>>         for (i = 0; i < l_mg->nr_lines; i++) {
>> @@ -882,8 +882,6 @@ static int pblk_lines_init(struct pblk *pblk)
>>         kfree(chunk_log);
>>         while (--i >= 0)
>>                 pblk_line_meta_free(&pblk->lines[i]);
>> -fail_free_lines:
>> -       kfree(pblk->lines);
>> fail_free_bb_aux:
>>         kfree(l_mg->bb_aux);
>> fail_free_bb_template:
> 
> It's not that simple... There are other double frees due to the way l_mg
> is allocated, which is fixed on the other patch.
> 

I know that. This was to fix up the original patch. I do not want to 
rebase ack'ed patches.