lightnvm: remove get_lun operation on gennvm

Since LUNs are managed internally on the target, there is no need for
the media manager to implement a get_lun operation.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>

3 files changed, 14 insertions, 30 deletions

diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
index 8791a2aaa9e3..3cf5d5947070 100644
--- a/drivers/lightnvm/gennvm.c
+++ b/drivers/lightnvm/gennvm.c
@@ -159,7 +159,7 @@ static int gen_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
         tdisk->fops = &gen_fops;
         tdisk->queue = tqueue;
 
-        targetdata = tt->init(tgt_dev, tdisk, s->lun_begin, s->lun_end);
+        targetdata = tt->init(tgt_dev, tdisk, &t->lun_list);
         if (IS_ERR(targetdata))
                 goto err_init;
 
@@ -613,16 +613,6 @@ static int gen_erase_blk(struct nvm_dev *dev, struct nvm_block *blk, int flags)
         return nvm_erase_ppa(dev, &addr, 1, flags);
 }
 
-static struct nvm_lun *gen_get_lun(struct nvm_dev *dev, int lunid)
-{
-        struct gen_dev *gn = dev->mp;
-
-        if (unlikely(lunid >= dev->geo.nr_luns))
-                return NULL;
-
-        return &gn->luns[lunid];
-}
-
 static void gen_lun_info_print(struct nvm_dev *dev)
 {
         struct gen_dev *gn = dev->mp;
@@ -655,7 +645,6 @@ static struct nvmm_type gen = {
 
         .mark_blk               = gen_mark_blk,
 
-        .get_lun                = gen_get_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 5377c7a987aa..165b9d396493 100644
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -1199,10 +1199,11 @@ static void rrpc_luns_free(struct rrpc *rrpc)
         kfree(rrpc->luns);
 }
 
-static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
+static int rrpc_luns_init(struct rrpc *rrpc, struct list_head *lun_list)
 {
         struct nvm_tgt_dev *dev = rrpc->dev;
         struct nvm_geo *geo = &dev->geo;
+        struct nvm_lun *lun;
         struct rrpc_lun *rlun;
         int i, j, ret = -EINVAL;
 
@@ -1218,16 +1219,11 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
         if (!rrpc->luns)
                 return -ENOMEM;
 
-        /* 1:1 mapping */
-        for (i = 0; i < rrpc->nr_luns; i++) {
-                int lunid = lun_begin + i;
-                struct nvm_lun *lun;
+        i = 0;
 
-                lun = dev->mt->get_lun(dev->parent, lunid);
-                if (!lun)
-                        goto err;
-
-                rlun = &rrpc->luns[i];
+        /* 1:1 mapping */
+        list_for_each_entry(lun, lun_list, list) {
+                rlun = &rrpc->luns[i++];
                 rlun->parent = lun;
                 rlun->blocks = vzalloc(sizeof(struct rrpc_block) *
                                                         geo->blks_per_lun);
@@ -1256,6 +1252,8 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
                 spin_lock_init(&rlun->lock);
         }
 
+        WARN_ON(i != rrpc->nr_luns);
+
         return 0;
 err:
         return ret;
@@ -1410,12 +1408,13 @@ err:
 static struct nvm_tgt_type tt_rrpc;
 
 static void *rrpc_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
-                                                int lun_begin, int lun_end)
+                                                struct list_head *lun_list)
 {
         struct request_queue *bqueue = dev->q;
         struct request_queue *tqueue = tdisk->queue;
         struct nvm_geo *geo = &dev->geo;
         struct rrpc *rrpc;
+        int lun_begin = (list_first_entry(lun_list, struct nvm_lun, list))->id;
         sector_t soffset;
         int ret;
 
@@ -1450,7 +1449,7 @@ static void *rrpc_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
         }
         rrpc->soffset = soffset;
 
-        ret = rrpc_luns_init(rrpc, lun_begin, lun_end);
+        ret = rrpc_luns_init(rrpc, lun_list);
         if (ret) {
                 pr_err("nvm: rrpc: could not initialize luns\n");
                 goto err;
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 1f1588c2557e..e56c35227249 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -504,8 +504,8 @@ static inline int ppa_to_slc(struct nvm_dev *dev, int slc_pg)
 
 typedef blk_qc_t (nvm_tgt_make_rq_fn)(struct request_queue *, struct bio *);
 typedef sector_t (nvm_tgt_capacity_fn)(void *);
-typedef void *(nvm_tgt_init_fn)(struct nvm_tgt_dev *, struct gendisk *, int,
-                                int);
+typedef void *(nvm_tgt_init_fn)(struct nvm_tgt_dev *, struct gendisk *,
+                                struct list_head *lun_list);
 typedef void (nvm_tgt_exit_fn)(void *);
 
 struct nvm_tgt_type {
@@ -541,7 +541,6 @@ typedef int (nvmm_remove_tgt_fn)(struct nvm_dev *, struct nvm_ioctl_remove *);
 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 void (nvmm_lun_info_print_fn)(struct nvm_dev *);
 
 typedef int (nvmm_get_area_fn)(struct nvm_dev *, sector_t *, sector_t);
@@ -563,9 +562,6 @@ struct nvmm_type {
         /* Bad block mgmt */
         nvmm_mark_blk_fn *mark_blk;
 
-        /* Configuration management */
-        nvmm_get_lun_fn *get_lun;
-
         /* Statistics */
         nvmm_lun_info_print_fn *lun_info_print;