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From: "Matias Bjørling" <m@bjorling.me>
To: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, axboe@fb.com
Cc: "Javier Gonzalez" <javier@javigon.com>,
	"Javier Gonzalez" <javier@cnexlabs.com>,
	"Matias Bjørling" <m@bjorling.me>
Subject: [PATCH 4/5] lightnvm: keep track of block counts
Date: Fri, 20 Nov 2015 13:47:56 +0100
Message-ID: <1448023677-22296-5-git-send-email-m@bjorling.me> (raw)
In-Reply-To: <1448023677-22296-1-git-send-email-m@bjorling.me>

From: Javier Gonzalez <javier@javigon.com>

Maintain number of in use blocks, free blocks, and bad blocks in a per
lun basis. This allows the upper layers to get information about the
state of each lun.

Also, account for blocks reserved to the device on the free block count.
nr_free_blocks matches now the actual number of blocks on the free list
when the device is booted.

Signed-off-by: Javier Gonzalez <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
---
 drivers/lightnvm/gennvm.c | 14 +++++++++++++-
 include/linux/lightnvm.h  |  2 ++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
index c0d0eb2..43c01e0 100644
--- a/drivers/lightnvm/gennvm.c
+++ b/drivers/lightnvm/gennvm.c
@@ -60,6 +60,8 @@ static int gennvm_luns_init(struct nvm_dev *dev, struct gen_nvm *gn)
 		lun->vlun.lun_id = i % dev->luns_per_chnl;
 		lun->vlun.chnl_id = i / dev->luns_per_chnl;
 		lun->vlun.nr_free_blocks = dev->blks_per_lun;
+		lun->vlun.nr_inuse_blocks = 0;
+		lun->vlun.nr_bad_blocks = 0;
 	}
 	return 0;
 }
@@ -87,6 +89,7 @@ static int gennvm_block_bb(struct ppa_addr ppa, int nr_blocks, u8 *blks,
 		}
 
 		list_move_tail(&blk->list, &lun->bb_list);
+		lun->vlun.nr_bad_blocks++;
 	}
 
 	return 0;
@@ -139,6 +142,7 @@ static int gennvm_block_map(u64 slba, u32 nlb, __le64 *entries, void *private)
 			list_move_tail(&blk->list, &lun->used_list);
 			blk->type = 1;
 			lun->vlun.nr_free_blocks--;
+			lun->vlun.nr_inuse_blocks++;
 		}
 	}
 
@@ -167,8 +171,10 @@ static int gennvm_blocks_init(struct nvm_dev *dev, struct gen_nvm *gn)
 			block->id = cur_block_id++;
 
 			/* First block is reserved for device */
-			if (unlikely(lun_iter == 0 && blk_iter == 0))
+			if (unlikely(lun_iter == 0 && blk_iter == 0)) {
+				lun->vlun.nr_free_blocks--;
 				continue;
+			}
 
 			list_add_tail(&block->list, &lun->free_list);
 		}
@@ -266,6 +272,7 @@ static struct nvm_block *gennvm_get_blk(struct nvm_dev *dev,
 	blk->type = 1;
 
 	lun->vlun.nr_free_blocks--;
+	lun->vlun.nr_inuse_blocks++;
 
 	spin_unlock(&vlun->lock);
 out:
@@ -283,16 +290,21 @@ static void gennvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
 	case 1:
 		list_move_tail(&blk->list, &lun->free_list);
 		lun->vlun.nr_free_blocks++;
+		lun->vlun.nr_inuse_blocks--;
 		blk->type = 0;
 		break;
 	case 2:
 		list_move_tail(&blk->list, &lun->bb_list);
+		lun->vlun.nr_bad_blocks++;
+		lun->vlun.nr_inuse_blocks--;
 		break;
 	default:
 		WARN_ON_ONCE(1);
 		pr_err("gennvm: erroneous block type (%lu -> %u)\n",
 							blk->id, blk->type);
 		list_move_tail(&blk->list, &lun->bb_list);
+		lun->vlun.nr_bad_blocks++;
+		lun->vlun.nr_inuse_blocks--;
 	}
 
 	spin_unlock(&vlun->lock);
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index cbe288a..831a20c 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -213,7 +213,9 @@ struct nvm_lun {
 	int lun_id;
 	int chnl_id;
 
+	unsigned int nr_inuse_blocks;	/* Number of used blocks */
 	unsigned int nr_free_blocks;	/* Number of unused blocks */
+	unsigned int nr_bad_blocks;	/* Number of bad blocks */
 	struct nvm_block *blocks;
 
 	spinlock_t lock;
-- 
2.1.4


  parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-20 12:47 [PATCH 0/5] LightNVM fixes Matias Bjørling
2015-11-20 12:47 ` [PATCH 1/5] lightnvm: wrong return value and redundant free Matias Bjørling
2015-11-20 12:47 ` [PATCH 2/5] lightnvm: missing free on init error Matias Bjørling
2015-11-20 12:47 ` [PATCH 3/5] nvme: lightnvm: use admin queues for admin cmds Matias Bjørling
2015-11-20 12:47 ` Matias Bjørling [this message]
2015-11-20 12:47 ` [PATCH 5/5] lightnvm: add free and bad lun info to show luns Matias Bjørling
2015-11-20 15:51 ` [PATCH 0/5] LightNVM fixes Jens Axboe

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