mtd: ubi: allow UBI volumes to provide NVMEM

index 437c5b83ffe51..69fa6fecb8494 100644
@@ -456,7 +456,7 @@ static void ubiblock_cleanup(struct ubiblock *dev)
 	idr_remove(&ubiblock_minor_idr, dev->gd->first_minor);
 }
 
-int ubiblock_remove(struct ubi_volume_info *vi)
+int ubiblock_remove(struct ubi_volume_info *vi, bool force)
 {
 	struct ubiblock *dev;
 	int ret;

@@ -470,7 +470,7 @@ int ubiblock_remove(struct ubi_volume_info *vi)
 
 	/* Found a device, let's lock it so we can check if it's busy */
 	mutex_lock(&dev->dev_mutex);
-	if (dev->refcnt > 0) {
+	if (dev->refcnt > 0 && !force) {
 		ret = -EBUSY;
 		goto out_unlock_dev;
 	}

@@ -545,7 +545,7 @@ static int ubiblock_notify(struct notifier_block *nb,
 		 */
 		break;
 	case UBI_VOLUME_REMOVED:
-		ubiblock_remove(&nt->vi);
+		ubiblock_remove(&nt->vi, true);
 		break;
 	case UBI_VOLUME_RESIZED:
 		ubiblock_resize(&nt->vi);

index f43430b9c1e65..bb55e863dd296 100644
@@ -572,7 +572,7 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
 		struct ubi_volume_info vi;
 
 		ubi_get_volume_info(desc, &vi);
-		err = ubiblock_remove(&vi);
+		err = ubiblock_remove(&vi, false);
 		break;
 	}
 

index c8f1bd4fa1008..44c0eeaf1e1b0 100644
@@ -979,7 +979,7 @@ static inline void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol) {}
 int ubiblock_init(void);
 void ubiblock_exit(void);
 int ubiblock_create(struct ubi_volume_info *vi);
-int ubiblock_remove(struct ubi_volume_info *vi);
+int ubiblock_remove(struct ubi_volume_info *vi, bool force);
 #else
 static inline int ubiblock_init(void) { return 0; }
 static inline void ubiblock_exit(void) {}

@@ -987,7 +987,7 @@ static inline int ubiblock_create(struct ubi_volume_info *vi)
 {
 	return -ENOSYS;
 }
-static inline int ubiblock_remove(struct ubi_volume_info *vi)
+static inline int ubiblock_remove(struct ubi_volume_info *vi, bool force)
 {
 	return -ENOSYS;
 }

index 69fa6fecb8494..e0618bbde3613 100644
@@ -33,6 +33,7 @@
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
+#include <linux/namei.h>
 #include <linux/slab.h>
 #include <linux/mtd/ubi.h>
 #include <linux/blkdev.h>

@@ -65,10 +66,10 @@ struct ubiblock_pdu {
 };
 
 /* Numbers of elements set in the @ubiblock_param array */
-static int ubiblock_devs __initdata;
+static int ubiblock_devs;
 
 /* MTD devices specification parameters */
-static struct ubiblock_param ubiblock_param[UBIBLOCK_MAX_DEVICES] __initdata;
+static struct ubiblock_param ubiblock_param[UBIBLOCK_MAX_DEVICES];
 
 struct ubiblock {
 	struct ubi_volume_desc *desc;

@@ -532,6 +533,85 @@ static int ubiblock_resize(struct ubi_volume_info *vi)
 	return 0;
 }
 
+static bool
+match_volume_desc(struct ubi_volume_info *vi, const char *name, int ubi_num, int vol_id)
+{
+	int err, len;
+	struct path path;
+	struct kstat stat;
+
+	if (ubi_num == -1) {
+		/* No ubi num, name must be a vol device path */
+		err = kern_path(name, LOOKUP_FOLLOW, &path);
+		if (err)
+			return false;
+
+		err = vfs_getattr(&path, &stat, STATX_TYPE, AT_STATX_SYNC_AS_STAT);
+		path_put(&path);
+		if (err)
+			return false;
+
+		if (!S_ISCHR(stat.mode))
+			return false;
+
+		if (vi->ubi_num != ubi_major2num(MAJOR(stat.rdev)))
+			return false;
+
+		if (vi->vol_id != MINOR(stat.rdev) - 1)
+			return false;
+
+		return true;
+	}
+
+	if (vol_id == -1) {
+		if (vi->ubi_num != ubi_num)
+			return false;
+
+		len = strnlen(name, UBI_VOL_NAME_MAX + 1);
+		if (len < 1 || vi->name_len != len)
+			return false;
+
+		if (strcmp(name, vi->name))
+			return false;
+
+		return true;
+	}
+
+	if (vi->ubi_num != ubi_num)
+		return false;
+
+	if (vi->vol_id != vol_id)
+		return false;
+
+	return true;
+}
+
+static void
+ubiblock_create_from_param(struct ubi_volume_info *vi)
+{
+	int i, ret = 0;
+	struct ubiblock_param *p;
+
+	/*
+	 * Iterate over ubiblock cmdline parameters. If a parameter matches the
+	 * newly added volume create the ubiblock device for it.
+	 */
+	for (i = 0; i < ubiblock_devs; i++) {
+		p = &ubiblock_param[i];
+
+		if (!match_volume_desc(vi, p->name, p->ubi_num, p->vol_id))
+			continue;
+
+		ret = ubiblock_create(vi);
+		if (ret) {
+			pr_err(
+			       "UBI: block: can't add '%s' volume on ubi%d_%d, err=%d\n",
+			       vi->name, p->ubi_num, p->vol_id, ret);
+		}
+		break;
+	}
+}
+
 static int ubiblock_notify(struct notifier_block *nb,
 			 unsigned long notification_type, void *ns_ptr)
 {

@@ -539,10 +619,7 @@ static int ubiblock_notify(struct notifier_block *nb,
 
 	switch (notification_type) {
 	case UBI_VOLUME_ADDED:
-		/*
-		 * We want to enforce explicit block device creation for
-		 * volumes, so when a volume is added we do nothing.
-		 */
+		ubiblock_create_from_param(&nt->vi);
 		break;
 	case UBI_VOLUME_REMOVED:
 		ubiblock_remove(&nt->vi, true);

@@ -568,56 +645,6 @@ static struct notifier_block ubiblock_notifier = {
 	.notifier_call = ubiblock_notify,
 };
 
-static struct ubi_volume_desc * __init
-open_volume_desc(const char *name, int ubi_num, int vol_id)
-{
-	if (ubi_num == -1)
-		/* No ubi num, name must be a vol device path */
-		return ubi_open_volume_path(name, UBI_READONLY);
-	else if (vol_id == -1)
-		/* No vol_id, must be vol_name */
-		return ubi_open_volume_nm(ubi_num, name, UBI_READONLY);
-	else
-		return ubi_open_volume(ubi_num, vol_id, UBI_READONLY);
-}
-
-static void __init ubiblock_create_from_param(void)
-{
-	int i, ret = 0;
-	struct ubiblock_param *p;
-	struct ubi_volume_desc *desc;
-	struct ubi_volume_info vi;
-
-	/*
-	 * If there is an error creating one of the ubiblocks, continue on to
-	 * create the following ubiblocks. This helps in a circumstance where
-	 * the kernel command-line specifies multiple block devices and some
-	 * may be broken, but we still want the working ones to come up.
-	 */
-	for (i = 0; i < ubiblock_devs; i++) {
-		p = &ubiblock_param[i];
-
-		desc = open_volume_desc(p->name, p->ubi_num, p->vol_id);
-		if (IS_ERR(desc)) {
-			pr_err(
-			       "UBI: block: can't open volume on ubi%d_%d, err=%ld\n",
-			       p->ubi_num, p->vol_id, PTR_ERR(desc));
-			continue;
-		}
-
-		ubi_get_volume_info(desc, &vi);
-		ubi_close_volume(desc);
-
-		ret = ubiblock_create(&vi);
-		if (ret) {
-			pr_err(
-			       "UBI: block: can't add '%s' volume on ubi%d_%d, err=%d\n",
-			       vi.name, p->ubi_num, p->vol_id, ret);
-			continue;
-		}
-	}
-}
-
 static void ubiblock_remove_all(void)
 {
 	struct ubiblock *next;

@@ -643,18 +670,7 @@ int __init ubiblock_init(void)
 	if (ubiblock_major < 0)
 		return ubiblock_major;
 
-	/*
-	 * Attach block devices from 'block=' module param.
-	 * Even if one block device in the param list fails to come up,
-	 * still allow the module to load and leave any others up.
-	 */
-	ubiblock_create_from_param();
-
-	/*
-	 * Block devices are only created upon user requests, so we ignore
-	 * existing volumes.
-	 */
-	ret = ubi_register_volume_notifier(&ubiblock_notifier, 1);
+	ret = ubi_register_volume_notifier(&ubiblock_notifier, 0);
 	if (ret)
 		goto err_unreg;
 	return 0;

index e0618bbde3613..99b5f502c9dbc 100644
@@ -470,7 +470,7 @@ int ubiblock_remove(struct ubi_volume_info *vi, bool force)
 	}
 
 	/* Found a device, let's lock it so we can check if it's busy */
-	mutex_lock(&dev->dev_mutex);
+	mutex_lock_nested(&dev->dev_mutex, SINGLE_DEPTH_NESTING);
 	if (dev->refcnt > 0 && !force) {
 		ret = -EBUSY;
 		goto out_unlock_dev;

230 lines not on this page · raw message

index bb55e863dd296..0ba6aa6a2e11d 100644
@@ -1065,7 +1065,7 @@ static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,
 		}
 
 		mutex_lock(&ubi_devices_mutex);
-		err = ubi_detach_mtd_dev(ubi_num, 0);
+		err = ubi_detach_mtd_dev(ubi_num, 0, false);
 		mutex_unlock(&ubi_devices_mutex);
 		break;
 	}

index 44c0eeaf1e1b0..54093858f3385 100644
@@ -939,7 +939,7 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
 int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
 		       int vid_hdr_offset, int max_beb_per1024,
 		       bool disable_fm);
-int ubi_detach_mtd_dev(int ubi_num, int anyway);
+int ubi_detach_mtd_dev(int ubi_num, int anyway, bool have_lock);
 struct ubi_device *ubi_get_device(int ubi_num);
 void ubi_put_device(struct ubi_device *ubi);
 struct ubi_device *ubi_get_by_major(int major);

index 99b5f502c9dbc..1d5148371991b 100644
@@ -533,6 +533,29 @@ static int ubiblock_resize(struct ubi_volume_info *vi)
 	return 0;
 }
 
+static int ubiblock_shutdown(struct ubi_volume_info *vi)
+{
+	struct ubiblock *dev;
+	struct gendisk *disk;
+	int ret = 0;
+
+	mutex_lock(&devices_mutex);
+	dev = find_dev_nolock(vi->ubi_num, vi->vol_id);
+	if (!dev) {
+		ret = -ENODEV;
+		goto out_unlock;
+	}
+	disk = dev->gd;
+
+out_unlock:
+	mutex_unlock(&devices_mutex);
+
+	if (!ret)
+		blk_mark_disk_dead(disk);
+
+	return ret;
+};
+
 static bool
 match_volume_desc(struct ubi_volume_info *vi, const char *name, int ubi_num, int vol_id)
 {

@@ -624,6 +647,9 @@ static int ubiblock_notify(struct notifier_block *nb,
 	case UBI_VOLUME_REMOVED:
 		ubiblock_remove(&nt->vi, true);
 		break;
+	case UBI_VOLUME_SHUTDOWN:
+		ubiblock_shutdown(&nt->vi);
+		break;
 	case UBI_VOLUME_RESIZED:
 		ubiblock_resize(&nt->vi);
 		break;

index c153373c13dab..ccee4a28ffe97 100644
@@ -1088,7 +1088,6 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway, bool have_lock)
 		return -EINVAL;
 
 	spin_lock(&ubi_devices_lock);
-	put_device(&ubi->dev);
 	ubi->ref_count -= 1;
 	if (ubi->ref_count) {
 		if (!anyway) {

@@ -1099,6 +1098,12 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway, bool have_lock)
 		ubi_err(ubi, "%s reference count %d, destroy anyway",
 			ubi->ubi_name, ubi->ref_count);
 	}
+	spin_unlock(&ubi_devices_lock);
+
+	ubi_notify_all(ubi, UBI_VOLUME_SHUTDOWN, NULL);
+
+	spin_lock(&ubi_devices_lock);
+	put_device(&ubi->dev);
 	ubi_devices[ubi_num] = NULL;
 	spin_unlock(&ubi_devices_lock);
 

index 2c867d16f89f7..eed4b57c61bda 100644
@@ -352,6 +352,11 @@ int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
 		err = -EBUSY;
 		goto out_unlock;
 	}
+	spin_unlock(&ubi->volumes_lock);
+
+	ubi_volume_notify(ubi, vol, UBI_VOLUME_SHUTDOWN);
+
+	spin_lock(&ubi->volumes_lock);
 	ubi->volumes[vol_id] = NULL;
 	spin_unlock(&ubi->volumes_lock);
 

index a529347fd75b2..562f92504f2b7 100644
@@ -192,6 +192,7 @@ struct ubi_device_info {
  *			or a volume was removed)
  * @UBI_VOLUME_RESIZED: a volume has been re-sized
  * @UBI_VOLUME_RENAMED: a volume has been re-named
+ * @UBI_VOLUME_SHUTDOWN: a volume is going to removed, shutdown users
  * @UBI_VOLUME_UPDATED: data has been written to a volume
  *
  * These constants define which type of event has happened when a volume

@@ -202,6 +203,7 @@ enum {
 	UBI_VOLUME_REMOVED,
 	UBI_VOLUME_RESIZED,
 	UBI_VOLUME_RENAMED,
+	UBI_VOLUME_SHUTDOWN,
 	UBI_VOLUME_UPDATED,
 };
 

index eed4b57c61bda..9db845a43ecfc 100644
@@ -124,6 +124,31 @@ static void vol_release(struct device *dev)
 	kfree(vol);
 }
 
+static struct fwnode_handle *find_volume_fwnode(struct ubi_volume *vol)
+{
+	struct fwnode_handle *fw_vols, *fw_vol;
+	const char *volname;
+	u32 volid;
+
+	fw_vols = device_get_named_child_node(vol->dev.parent->parent, "volumes");
+	if (!fw_vols)
+		return NULL;
+
+	fwnode_for_each_child_node(fw_vols, fw_vol) {
+		if (!fwnode_property_read_string(fw_vol, "volume-name", &volname) &&
+		    strncmp(volname, vol->name, vol->name_len))
+			continue;
+
+		if (!fwnode_property_read_u32(fw_vol, "volume-id", &volid) &&
+		    vol->vol_id != volid)
+			continue;
+
+		return fw_vol;
+	}
+
+	return NULL;
+}
+
 /**
  * ubi_create_volume - create volume.
  * @ubi: UBI device description object

@@ -223,6 +248,7 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
 	vol->name_len  = req->name_len;
 	memcpy(vol->name, req->name, vol->name_len);
 	vol->ubi = ubi;
+	device_set_node(&vol->dev, find_volume_fwnode(vol));
 
 	/*
 	 * Finish all pending erases because there may be some LEBs belonging

@@ -597,6 +623,7 @@ int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol)
 	vol->dev.class = &ubi_class;
 	vol->dev.groups = volume_dev_groups;
 	dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id);
+	device_set_node(&vol->dev, find_volume_fwnode(vol));
 	err = device_register(&vol->dev);
 	if (err) {
 		cdev_del(&vol->cdev);

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