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Date: Sun, 20 Mar 2016 00:58:58 +0800
From: Wenwei Tao <ww.tao0320@...il.com>
To: mb@...htnvm.io, jg@...htnvm.io
Cc: linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: [PATCH 3/3] lightnvm: export per lun information to user
Export per lun information to user, let the user
know more detail information about underlying device.
Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
---
drivers/lightnvm/core.c | 59 ++++++++++++++++++++++++++++++++++++++++++-
drivers/lightnvm/gennvm.c | 34 +++++++++++++++++++++++++
include/linux/lightnvm.h | 3 +++
include/uapi/linux/lightnvm.h | 23 +++++++++++++++++
4 files changed, 118 insertions(+), 1 deletion(-)
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 84bc72d..7701eab 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -28,7 +28,6 @@
#include <linux/miscdevice.h>
#include <linux/lightnvm.h>
#include <linux/sched/sysctl.h>
-#include <uapi/linux/lightnvm.h>
static LIST_HEAD(nvm_targets);
static LIST_HEAD(nvm_mgrs);
@@ -1041,6 +1040,62 @@ static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
return __nvm_configure_remove(&remove);
}
+static long nvm_ioctl_dev_luns_status(struct file *file, void __user *arg)
+{
+ struct nvm_dev *dev;
+ struct nvm_ioctl_luns_status *status;
+ long ret = -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ status = kzalloc(sizeof(struct nvm_ioctl_luns_status), GFP_KERNEL);
+ if (!status)
+ return -ENOMEM;
+
+ if (copy_from_user(status, arg,
+ sizeof(struct nvm_ioctl_luns_status))) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ status->dev[DISK_NAME_LEN - 1] = '\0';
+ down_write(&nvm_lock);
+ dev = nvm_find_nvm_dev(status->dev);
+ up_write(&nvm_lock);
+ if (!dev) {
+ pr_err("nvm: device not found\n");
+ goto out;
+ }
+
+ if (!dev->mt) {
+ pr_info("nvm: device has no media manager registered.\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (status->lun_begin > status->lun_end ||
+ status->lun_end > dev->nr_luns) {
+ pr_err("nvm: lun out of bound (%u:%u > %u)\n",
+ status->lun_begin, status->lun_end, dev->nr_luns);
+ goto out;
+ }
+
+ dev->mt->get_luns_status(dev, status);
+
+ if (copy_to_user(arg, status,
+ sizeof(struct nvm_ioctl_luns_status))) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ ret = 0;
+
+out:
+ kfree(status);
+ return ret;
+}
+
static void nvm_setup_nvm_sb_info(struct nvm_sb_info *info)
{
info->seqnr = 1;
@@ -1150,6 +1205,8 @@ static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
return nvm_ioctl_dev_create(file, argp);
case NVM_DEV_REMOVE:
return nvm_ioctl_dev_remove(file, argp);
+ case NVM_DEV_LUNS_STATUS:
+ return nvm_ioctl_dev_luns_status(file, argp);
case NVM_DEV_INIT:
return nvm_ioctl_dev_init(file, argp);
case NVM_DEV_FACTORY:
diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
index 72e124a..b2390f4 100644
--- a/drivers/lightnvm/gennvm.c
+++ b/drivers/lightnvm/gennvm.c
@@ -502,6 +502,39 @@ static struct nvm_lun *gennvm_get_lun(struct nvm_dev *dev, int lunid)
return &gn->luns[lunid].vlun;
}
+static void gennvm_get_luns_status(struct nvm_dev *dev,
+ struct nvm_ioctl_luns_status *status)
+{
+ int i, lun_begin = status->lun_begin;
+ int nr_luns, lun_end = status->lun_end;
+ struct gen_nvm *gn = dev->mp;
+ struct nvm_lun_status *lun_stat;
+ struct gen_lun *lun;
+
+ status->nr_luns = dev->nr_luns;
+ nr_luns = min(lun_end - lun_begin + 1,
+ NVM_LUNS_STATUS);
+
+ for (i = 0; i < nr_luns; i++) {
+ lun = &gn->luns[i + lun_begin];
+ lun_stat = &status->status[i];
+
+ lun_stat->reserved =
+ test_bit(i + lun_begin, dev->lun_map);
+ lun_stat->id = lun->vlun.id;
+ lun_stat->lun_id = lun->vlun.lun_id;
+ lun_stat->chnl_id = lun->vlun.chnl_id;
+ lun_stat->nr_free_blocks =
+ lun->vlun.nr_free_blocks;
+ lun_stat->nr_open_blocks =
+ lun->vlun.nr_open_blocks;
+ lun_stat->nr_closed_blocks =
+ lun->vlun.nr_closed_blocks;
+ lun_stat->nr_bad_blocks =
+ lun->vlun.nr_bad_blocks;
+ }
+}
+
static void gennvm_lun_info_print(struct nvm_dev *dev)
{
struct gen_nvm *gn = dev->mp;
@@ -542,6 +575,7 @@ static struct nvmm_type gennvm = {
.get_lun = gennvm_get_lun,
.reserve_lun = gennvm_reserve_lun,
.release_lun = gennvm_release_lun,
+ .get_luns_status = gennvm_get_luns_status,
.lun_info_print = gennvm_lun_info_print,
.get_area = gennvm_get_area,
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index b941a8c..88b95f9 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -472,6 +472,8 @@ typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct nvm_block *,
typedef struct nvm_lun *(nvmm_get_lun_fn)(struct nvm_dev *, int);
typedef int (nvmm_reserve_lun)(struct nvm_dev *, int);
typedef void (nvmm_release_lun)(struct nvm_dev *, int);
+typedef void (nvmm_get_luns_status)(struct nvm_dev *,
+ struct nvm_ioctl_luns_status *);
typedef void (nvmm_lun_info_print_fn)(struct nvm_dev *);
typedef int (nvmm_get_area_fn)(struct nvm_dev *, sector_t *, sector_t);
@@ -502,6 +504,7 @@ struct nvmm_type {
nvmm_release_lun *release_lun;
/* Statistics */
+ nvmm_get_luns_status *get_luns_status;
nvmm_lun_info_print_fn *lun_info_print;
nvmm_get_area_fn *get_area;
diff --git a/include/uapi/linux/lightnvm.h b/include/uapi/linux/lightnvm.h
index 6dbf6a0..2d52d6d 100644
--- a/include/uapi/linux/lightnvm.h
+++ b/include/uapi/linux/lightnvm.h
@@ -36,6 +36,7 @@
#define NVM_MMTYPE_LEN 8
#define NVM_LUNS_MAX 768
+#define NVM_LUNS_STATUS 64
#define NVM_CTRL_FILE "/dev/lightnvm/control"
@@ -110,6 +111,25 @@ struct nvm_ioctl_remove {
__u32 flags;
};
+struct nvm_lun_status {
+ bool reserved;
+ __u32 id;
+ __u32 lun_id;
+ __u32 chnl_id;
+ __u32 nr_open_blocks;
+ __u32 nr_closed_blocks;
+ __u32 nr_free_blocks;
+ __u32 nr_bad_blocks;
+};
+
+struct nvm_ioctl_luns_status {
+ char dev[DISK_NAME_LEN];
+ __u32 nr_luns;
+ __u32 lun_begin;
+ __u32 lun_end;
+ struct nvm_lun_status status[NVM_LUNS_STATUS];
+};
+
struct nvm_ioctl_dev_init {
char dev[DISK_NAME_LEN]; /* open-channel SSD device */
char mmtype[NVM_MMTYPE_LEN]; /* register to media manager */
@@ -140,6 +160,7 @@ enum {
/* device level cmds */
NVM_DEV_CREATE_CMD,
NVM_DEV_REMOVE_CMD,
+ NVM_DEV_LUNS_STATUS_CMD,
/* Init a device to support LightNVM media managers */
NVM_DEV_INIT_CMD,
@@ -158,6 +179,8 @@ enum {
struct nvm_ioctl_create)
#define NVM_DEV_REMOVE _IOW(NVM_IOCTL, NVM_DEV_REMOVE_CMD, \
struct nvm_ioctl_remove)
+#define NVM_DEV_LUNS_STATUS _IOW(NVM_IOCTL, NVM_DEV_LUNS_STATUS_CMD, \
+ struct nvm_ioctl_luns_status)
#define NVM_DEV_INIT _IOW(NVM_IOCTL, NVM_DEV_INIT_CMD, \
struct nvm_ioctl_dev_init)
#define NVM_DEV_FACTORY _IOW(NVM_IOCTL, NVM_DEV_FACTORY_CMD, \
--
1.9.1
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