In order to register through the sysfs interface, a driver needs to know
its kobject. On a disk structure, this happens when the partition
information is added (device_add_disk), which for lightnvm takes place
after the target has been initialized. This means that on target
initialization, the kboject has not been created yet.
This patch adds a target function to let targets initialize their own
kboject as a child of the disk kobject.
Signed-off-by: Javier González <jav...@cnexlabs.com>
---
drivers/lightnvm/core.c | 9 +++++++++
include/linux/lightnvm.h | 5 +++++
2 files changed, 14 insertions(+)
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 3a3e91d..8baae61 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -289,6 +289,9 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct
nvm_ioctl_create *create)
set_capacity(tdisk, tt->capacity(targetdata));
add_disk(tdisk);
+ if (tt->sysfs_init && tt->sysfs_init(tdisk))
+ goto err_sysfs;
+
t->type = tt;
t->disk = tdisk;
t->dev = tgt_dev;
@@ -298,6 +301,9 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct
nvm_ioctl_create *create)
mutex_unlock(&dev->mlock);
return 0;
+err_sysfs:
+ if (tt->exit)
+ tt->exit(targetdata);
err_init:
put_disk(tdisk);
err_queue:
@@ -320,6 +326,9 @@ static void __nvm_remove_target(struct nvm_target *t)
del_gendisk(tdisk);
blk_cleanup_queue(q);
+ if (tt->sysfs_exit)
+ tt->sysfs_exit(tdisk->private_data);
+
if (tt->exit)
tt->exit(tdisk->private_data);
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index a75d8c0..11c318e 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -440,6 +440,7 @@ 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 *);
typedef void (nvm_tgt_exit_fn)(void *);
+typedef int (nvm_tgt_sysfs_init_fn)(struct gendisk *);
struct nvm_tgt_type {
const char *name;
@@ -453,6 +454,10 @@ struct nvm_tgt_type {
nvm_tgt_init_fn *init;
nvm_tgt_exit_fn *exit;
+ /* sysfs */
+ nvm_tgt_sysfs_init_fn *sysfs_init;
+ nvm_tgt_exit_fn *sysfs_exit;
+
/* For internal use */
struct list_head list;
};
--
2.7.4
