Based on the previous patch, we now introduce an ioctl to initialize the
device using nvm_init_sysblock and create the necessary system blocks.
The user may specify the media manager that they wish to instantiate on
top. Default from user-space will be "gennvm".
Signed-off-by: Matias Bjørling <m@xxxxxxxxxxx>
---
drivers/lightnvm/core.c | 50 +++++++++++++++++++++++++++++++++++++++++++
include/uapi/linux/lightnvm.h | 11 ++++++++++
2 files changed, 61 insertions(+)
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 73b8ae1..ee08fac 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -1019,6 +1019,54 @@ static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
return __nvm_configure_remove(&remove);
}
+static void nvm_setup_nvm_sb_info(struct nvm_sb_info *info)
+{
+ info->seqnr = 1;
+ info->erase_cnt = 0;
+ info->version = 1;
+}
+
+static long __nvm_ioctl_dev_init(struct nvm_ioctl_dev_init *init)
+{
+ struct nvm_dev *dev;
+ struct nvm_sb_info info;
+
+ down_write(&nvm_lock);
+ dev = nvm_find_nvm_dev(init->dev);
+ up_write(&nvm_lock);
+ if (!dev) {
+ pr_err("nvm: device not found\n");
+ return -EINVAL;
+ }
+
+ nvm_setup_nvm_sb_info(&info);
+
+ strncpy(info.mmtype, init->mmtype, NVM_MMTYPE_LEN);
+ info.fs_ppa.ppa = -1;
+
+ return nvm_init_sysblock(dev, &info);
+}
+
+static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
+{
+ struct nvm_ioctl_dev_init init;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
+ return -EFAULT;
+
+ if (init.flags != 0) {
+ pr_err("nvm: no flags supported\n");
+ return -EINVAL;
+ }
+
+ init.dev[DISK_NAME_LEN - 1] = '\0';
+
+ return __nvm_ioctl_dev_init(&init);
+}
+
static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
@@ -1032,6 +1080,8 @@ 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_INIT:
+ return nvm_ioctl_dev_init(file, argp);
}
return 0;
}
diff --git a/include/uapi/linux/lightnvm.h b/include/uapi/linux/lightnvm.h
index 0171b85..56339e2 100644
--- a/include/uapi/linux/lightnvm.h
+++ b/include/uapi/linux/lightnvm.h
@@ -101,6 +101,12 @@ struct nvm_ioctl_remove {
__u32 flags;
};
+struct nvm_ioctl_dev_init {
+ char dev[DISK_NAME_LEN]; /* open-channel SSD device */
+ char mmtype[NVM_MMTYPE_LEN]; /* register to media manager */
+
+ __u32 flags;
+};
/* The ioctl type, 'L', 0x20 - 0x2F documented in ioctl-number.txt */
enum {
@@ -111,6 +117,9 @@ enum {
/* device level cmds */
NVM_DEV_CREATE_CMD,
NVM_DEV_REMOVE_CMD,
+
+ /* Init a device to support LightNVM media managers */
+ NVM_DEV_INIT_CMD,
};
#define NVM_IOCTL 'L' /* 0x4c */
@@ -123,6 +132,8 @@ enum {
struct nvm_ioctl_create)
#define NVM_DEV_REMOVE _IOW(NVM_IOCTL, NVM_DEV_REMOVE_CMD, \
struct nvm_ioctl_remove)
+#define NVM_DEV_INIT _IOW(NVM_IOCTL, NVM_DEV_INIT_CMD, \
+ struct nvm_ioctl_dev_init)
#define NVM_VERSION_MAJOR 1
#define NVM_VERSION_MINOR 0
--
2.1.4
--
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