[PATCH 1/3] UBIFS, UBI: move volume string parser from UBIFS to UBI

[Daniel Golle <daniel@makrotopia.org>]

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 drivers/mtd/ubi/kapi.c  | 65 +++++++++++++++++++++++++++++++++++++++++++++++++
 fs/ubifs/super.c        | 64 +-----------------------------------------------
 include/linux/mtd/ubi.h |  1 +
 3 files changed, 67 insertions(+), 63 deletions(-)

diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index e844887..3dda9c3 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -20,6 +20,7 @@
 
 /* This file mostly implements UBI kernel API functions */
 
+#include <linux/ctype.h>
 #include <linux/module.h>
 #include <linux/err.h>
 #include <linux/slab.h>
@@ -329,6 +330,69 @@ struct ubi_volume_desc *ubi_open_volume_path(const char *pathname, int mode)
 EXPORT_SYMBOL_GPL(ubi_open_volume_path);
 
 /**
+ * ubi_open_volume_str - parse UBI device name string and open the UBI device.
+ * @name: UBI volume name
+ * @mode: UBI volume open mode
+ *
+ * The primary method of mounting UBIFS is by specifying the UBI volume
+ * character device node path. However, UBIFS may also be mounted withoug any
+ * character device node using one of the following methods:
+ *
+ * o ubiX_Y    - mount UBI device number X, volume Y;
+ * o ubiY      - mount UBI device number 0, volume Y;
+ * o ubiX:NAME - mount UBI device X, volume with name NAME;
+ * o ubi:NAME  - mount UBI device 0, volume with name NAME.
+ *
+ * Alternative '!' separator may be used instead of ':' (because some shells
+ * like busybox may interpret ':' as an NFS host name separator). This function
+ * returns UBI volume description object in case of success and a negative
+ * error code in case of failure.
+ */
+struct ubi_volume_desc *ubi_open_volume_str(const char *name, int mode)
+{
+	struct ubi_volume_desc *ubi;
+	int dev, vol;
+	char *endptr;
+
+	/* First, try to open using the device node path method */
+	ubi = ubi_open_volume_path(name, mode);
+	if (!IS_ERR(ubi))
+		return ubi;
+
+	/* Try the "nodev" method */
+	if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
+		return ERR_PTR(-EINVAL);
+
+	/* ubi:NAME method */
+	if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
+		return ubi_open_volume_nm(0, name + 4, mode);
+
+	if (!isdigit(name[3]))
+		return ERR_PTR(-EINVAL);
+
+	dev = simple_strtoul(name + 3, &endptr, 0);
+
+	/* ubiY method */
+	if (*endptr == '\0')
+		return ubi_open_volume(0, dev, mode);
+
+	/* ubiX_Y method */
+	if (*endptr == '_' && isdigit(endptr[1])) {
+		vol = simple_strtoul(endptr + 1, &endptr, 0);
+		if (*endptr != '\0')
+			return ERR_PTR(-EINVAL);
+		return ubi_open_volume(dev, vol, mode);
+	}
+
+	/* ubiX:NAME method */
+	if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
+		return ubi_open_volume_nm(dev, ++endptr, mode);
+
+	return ERR_PTR(-EINVAL);
+}
+EXPORT_SYMBOL_GPL(ubi_open_volume_str);
+
+/**
  * ubi_close_volume - close UBI volume.
  * @desc: volume descriptor
  */
@@ -365,6 +429,7 @@ void ubi_close_volume(struct ubi_volume_desc *desc)
 }
 EXPORT_SYMBOL_GPL(ubi_close_volume);
 
+
 /**
  * leb_read_sanity_check - does sanity checks on read requests.
  * @desc: volume descriptor
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 1fd90c0..a59fa2f 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -1887,68 +1887,6 @@ const struct super_operations ubifs_super_operations = {
 	.sync_fs       = ubifs_sync_fs,
 };
 
-/**
- * open_ubi - parse UBI device name string and open the UBI device.
- * @name: UBI volume name
- * @mode: UBI volume open mode
- *
- * The primary method of mounting UBIFS is by specifying the UBI volume
- * character device node path. However, UBIFS may also be mounted withoug any
- * character device node using one of the following methods:
- *
- * o ubiX_Y    - mount UBI device number X, volume Y;
- * o ubiY      - mount UBI device number 0, volume Y;
- * o ubiX:NAME - mount UBI device X, volume with name NAME;
- * o ubi:NAME  - mount UBI device 0, volume with name NAME.
- *
- * Alternative '!' separator may be used instead of ':' (because some shells
- * like busybox may interpret ':' as an NFS host name separator). This function
- * returns UBI volume description object in case of success and a negative
- * error code in case of failure.
- */
-static struct ubi_volume_desc *open_ubi(const char *name, int mode)
-{
-	struct ubi_volume_desc *ubi;
-	int dev, vol;
-	char *endptr;
-
-	/* First, try to open using the device node path method */
-	ubi = ubi_open_volume_path(name, mode);
-	if (!IS_ERR(ubi))
-		return ubi;
-
-	/* Try the "nodev" method */
-	if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
-		return ERR_PTR(-EINVAL);
-
-	/* ubi:NAME method */
-	if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
-		return ubi_open_volume_nm(0, name + 4, mode);
-
-	if (!isdigit(name[3]))
-		return ERR_PTR(-EINVAL);
-
-	dev = simple_strtoul(name + 3, &endptr, 0);
-
-	/* ubiY method */
-	if (*endptr == '\0')
-		return ubi_open_volume(0, dev, mode);
-
-	/* ubiX_Y method */
-	if (*endptr == '_' && isdigit(endptr[1])) {
-		vol = simple_strtoul(endptr + 1, &endptr, 0);
-		if (*endptr != '\0')
-			return ERR_PTR(-EINVAL);
-		return ubi_open_volume(dev, vol, mode);
-	}
-
-	/* ubiX:NAME method */
-	if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
-		return ubi_open_volume_nm(dev, ++endptr, mode);
-
-	return ERR_PTR(-EINVAL);
-}
-
 static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
 {
 	struct ubifs_info *c;
@@ -2105,7 +2043,7 @@ static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
 	 * because this might be a new mount point, and UBI allows only one
 	 * read-write user at a time.
 	 */
-	ubi = open_ubi(name, UBI_READONLY);
+	ubi = ubi_open_volume_str(name, UBI_READONLY);
 	if (IS_ERR(ubi)) {
 		pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d",
 		       current->pid, name, (int)PTR_ERR(ubi));
diff --git a/include/linux/mtd/ubi.h b/include/linux/mtd/ubi.h
index 1e271cb..0b92aa5 100644
--- a/include/linux/mtd/ubi.h
+++ b/include/linux/mtd/ubi.h
@@ -241,6 +241,7 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode);
 struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,
 					   int mode);
 struct ubi_volume_desc *ubi_open_volume_path(const char *pathname, int mode);
+struct ubi_volume_desc *ubi_open_volume_str(const char *pathname, int mode);
 
 int ubi_register_volume_notifier(struct notifier_block *nb,
 				 int ignore_existing);
-- 
2.9.3