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Message-Id: <1467211316-22373-4-git-send-email-m@bjorling.me>
Date: Wed, 29 Jun 2016 16:41:48 +0200
From: Matias Bjørling <m@...rling.me>
To: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Matias Bjørling <m@...rling.me>
Subject: [RFC PATCH 03/11] lightnvm: remove open/close statistics for gennvm
The responsibility of the media manager is not to keep track of
open/closed blocks. This is better maintained within a target,
that already manages this information on writes.
Remove the statistics and merge the states NVM_BLK_ST_OPEN and
NVM_BLK_ST_CLOSED.
Signed-off-by: Matias Bjørling <m@...rling.me>
---
drivers/lightnvm/gennvm.c | 31 ++++++-------------------------
drivers/lightnvm/rrpc.c | 5 -----
include/linux/lightnvm.h | 15 +++------------
3 files changed, 9 insertions(+), 42 deletions(-)
diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
index ec9fb68..1a3e164 100644
--- a/drivers/lightnvm/gennvm.c
+++ b/drivers/lightnvm/gennvm.c
@@ -122,9 +122,6 @@ 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_open_blocks = 0;
- lun->vlun.nr_closed_blocks = 0;
- lun->vlun.nr_bad_blocks = 0;
}
return 0;
}
@@ -149,7 +146,6 @@ static int gennvm_block_bb(struct gen_nvm *gn, struct ppa_addr ppa,
blk = &lun->vlun.blocks[i];
list_move_tail(&blk->list, &lun->bb_list);
- lun->vlun.nr_bad_blocks++;
lun->vlun.nr_free_blocks--;
}
@@ -200,9 +196,8 @@ static int gennvm_block_map(u64 slba, u32 nlb, __le64 *entries, void *private)
* block state. The block is assumed to be open.
*/
list_move_tail(&blk->list, &lun->used_list);
- blk->state = NVM_BLK_ST_OPEN;
+ blk->state = NVM_BLK_ST_TGT;
lun->vlun.nr_free_blocks--;
- lun->vlun.nr_open_blocks++;
}
}
@@ -346,11 +341,10 @@ static struct nvm_block *gennvm_get_blk_unlocked(struct nvm_dev *dev,
goto out;
blk = list_first_entry(&lun->free_list, struct nvm_block, list);
+
list_move_tail(&blk->list, &lun->used_list);
- blk->state = NVM_BLK_ST_OPEN;
-
+ blk->state = NVM_BLK_ST_TGT;
lun->vlun.nr_free_blocks--;
- lun->vlun.nr_open_blocks++;
out:
return blk;
@@ -374,27 +368,18 @@ static void gennvm_put_blk_unlocked(struct nvm_dev *dev, struct nvm_block *blk)
assert_spin_locked(&vlun->lock);
- if (blk->state & NVM_BLK_ST_OPEN) {
+ if (blk->state & NVM_BLK_ST_TGT) {
list_move_tail(&blk->list, &lun->free_list);
- lun->vlun.nr_open_blocks--;
- lun->vlun.nr_free_blocks++;
- blk->state = NVM_BLK_ST_FREE;
- } else if (blk->state & NVM_BLK_ST_CLOSED) {
- list_move_tail(&blk->list, &lun->free_list);
- lun->vlun.nr_closed_blocks--;
lun->vlun.nr_free_blocks++;
blk->state = NVM_BLK_ST_FREE;
} else if (blk->state & NVM_BLK_ST_BAD) {
list_move_tail(&blk->list, &lun->bb_list);
- lun->vlun.nr_bad_blocks++;
blk->state = NVM_BLK_ST_BAD;
} else {
WARN_ON_ONCE(1);
pr_err("gennvm: erroneous block type (%lu -> %u)\n",
blk->id, blk->state);
list_move_tail(&blk->list, &lun->bb_list);
- lun->vlun.nr_bad_blocks++;
- blk->state = NVM_BLK_ST_BAD;
}
}
@@ -516,12 +501,8 @@ static void gennvm_lun_info_print(struct nvm_dev *dev)
gennvm_for_each_lun(gn, lun, i) {
spin_lock(&lun->vlun.lock);
- pr_info("%s: lun%8u\t%u\t%u\t%u\t%u\n",
- dev->name, i,
- lun->vlun.nr_free_blocks,
- lun->vlun.nr_open_blocks,
- lun->vlun.nr_closed_blocks,
- lun->vlun.nr_bad_blocks);
+ pr_info("%s: lun%8u\t%u\n", dev->name, i,
+ lun->vlun.nr_free_blocks);
spin_unlock(&lun->vlun.lock);
}
diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
index 90c7cb4..c3a6f34 100644
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -512,17 +512,12 @@ static void rrpc_gc_queue(struct work_struct *work)
struct rrpc_block *rblk = gcb->rblk;
struct rrpc_lun *rlun = rblk->rlun;
struct nvm_lun *lun = rblk->parent->lun;
- struct nvm_block *blk = rblk->parent;
spin_lock(&rlun->lock);
list_add_tail(&rblk->prio, &rlun->prio_list);
spin_unlock(&rlun->lock);
spin_lock(&lun->lock);
- lun->nr_open_blocks--;
- lun->nr_closed_blocks++;
- blk->state &= ~NVM_BLK_ST_OPEN;
- blk->state |= NVM_BLK_ST_CLOSED;
list_move_tail(&rblk->list, &rlun->closed_list);
spin_unlock(&lun->lock);
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index cee4c8d..8b51d57 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -269,24 +269,15 @@ struct nvm_lun {
int lun_id;
int chnl_id;
- /* It is up to the target to mark blocks as closed. If the target does
- * not do it, all blocks are marked as open, and nr_open_blocks
- * represents the number of blocks in use
- */
- unsigned int nr_open_blocks; /* Number of used, writable blocks */
- unsigned int nr_closed_blocks; /* Number of used, read-only blocks */
+ spinlock_t lock;
+
unsigned int nr_free_blocks; /* Number of unused blocks */
- unsigned int nr_bad_blocks; /* Number of bad blocks */
-
- spinlock_t lock;
-
struct nvm_block *blocks;
};
enum {
NVM_BLK_ST_FREE = 0x1, /* Free block */
- NVM_BLK_ST_OPEN = 0x2, /* Open block - read-write */
- NVM_BLK_ST_CLOSED = 0x4, /* Closed block - read-only */
+ NVM_BLK_ST_TGT = 0x2, /* Block in use by target */
NVM_BLK_ST_BAD = 0x8, /* Bad block */
};
--
2.1.4
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