lightnvm: allow to init targets on factory mode

Target initialization has two responsibilities: creating the target
partition and instantiating the target. This patch enables to create a
factory partition (e.g., do not trigger recovery on the given target).
This is useful for target development and for being able to restore the
device state at any moment in time without requiring a full-device
erase.

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

1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 5f84d2a418f6..a63b563b1a8a 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -280,7 +280,7 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
         tdisk->fops = &nvm_fops;
         tdisk->queue = tqueue;
 
-        targetdata = tt->init(tgt_dev, tdisk);
+        targetdata = tt->init(tgt_dev, tdisk, create->flags);
         if (IS_ERR(targetdata))
                 goto err_init;
 
@@ -1244,8 +1244,16 @@ static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
         create.tgtname[DISK_NAME_LEN - 1] = '\0';
 
         if (create.flags != 0) {
-                pr_err("nvm: no flags supported\n");
-                return -EINVAL;
+                __u32 flags = create.flags;
+
+                /* Check for valid flags */
+                if (flags & NVM_TARGET_FACTORY)
+                        flags &= ~NVM_TARGET_FACTORY;
+
+                if (flags) {
+                        pr_err("nvm: flag not supported\n");
+                        return -EINVAL;
+                }
         }
 
         return __nvm_configure_create(&create);