This enables mounting, like JFFS2, MTD devices by "label":
mount -t squashfs mtd:appfs /tmp
where mtd:appfs comes from:
# > cat /proc/mtd
dev: size erasesize name
...
mtd22: 00750000 00010000 "appfs"
Signed-off-by: Joakim Tjernlund <joakim.tjernlund@xxxxxxxxxxxx>
---
fs/super.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/fs/super.c b/fs/super.c
index 97a17f9d9023..e603236b3ad8 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -37,6 +37,7 @@
#include <linux/user_namespace.h>
#include <linux/fs_context.h>
#include <uapi/linux/mount.h>
+#include <linux/mtd/mtd.h>
#include "internal.h"
static int thaw_super_locked(struct super_block *sb, enum freeze_holder who);
@@ -1612,6 +1613,26 @@ int get_tree_bdev_flags(struct fs_context *fc,
if (!fc->source)
return invalf(fc, "No source specified");
+#ifdef CONFIG_MTD_BLOCK
+ if (!strncmp(fc->source, "mtd:", 4)) {
+ struct mtd_info *mtd;
+ char *blk_source;
+
+ /* mount by MTD device name */
+ pr_debug("Block SB: name \"%s\"\n", fc->source);
+
+ mtd = get_mtd_device_nm(fc->source + 4);
+ if (IS_ERR(mtd))
+ return -EINVAL;
+ blk_source = kmalloc(20, GFP_KERNEL);
+ if (!blk_source)
+ return -ENOMEM;
+ sprintf(blk_source, "/dev/mtdblock%d", mtd->index);
+ kfree(fc->source);
+ fc->source = blk_source;
+ pr_debug("MTD device:%s found\n", fc->source);
+ }
+#endif
error = lookup_bdev(fc->source, &dev);
if (error) {
if (!(flags & GET_TREE_BDEV_QUIET_LOOKUP))
--
2.49.0
