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lightnvm: allow targets to use sysfs 

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 <javier@cnexlabs.com>
Added exit typedef and passed gendisk instead of void pointer for exit.
Signed-off-by: Matias Bjørling <matias@cnexlabs.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Javier González 2017-01-31 13:17:20 +01:00 committed by Jens Axboe
parent deccf5a52e
commit 9a69b0ed62
2 changed files with 15 additions and 0 deletions
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9
drivers/lightnvm/core.c
View File

@ -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);
if (tt->exit)
tt->exit(tdisk->private_data);

6
include/linux/lightnvm.h
View File

@ -440,6 +440,8 @@ 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 *);
typedef void (nvm_tgt_sysfs_exit_fn)(struct gendisk *);
struct nvm_tgt_type {
const char *name;
@ -453,6 +455,10 @@ struct nvm_tgt_type {
nvm_tgt_init_fn *init;
nvm_tgt_exit_fn *exit;
/* sysfs */
nvm_tgt_sysfs_init_fn *sysfs_init;
nvm_tgt_sysfs_exit_fn *sysfs_exit;
/* For internal use */
struct list_head list;
};