Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/init/do_mounts.c b/init/do_mounts.c
index e1c9afa..9634ecf 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/ctype.h>
@@ -22,6 +23,7 @@
#include <linux/nfs_fs.h>
#include <linux/nfs_fs_sb.h>
#include <linux/nfs_mount.h>
+#include <uapi/linux/mount.h>
#include "do_mounts.h"
@@ -167,6 +169,24 @@
}
return res;
}
+
+/**
+ * match_dev_by_label - callback for finding a partition using its label
+ * @dev: device passed in by the caller
+ * @data: opaque pointer to the label to match
+ *
+ * Returns 1 if the device matches, and 0 otherwise.
+ */
+static int match_dev_by_label(struct device *dev, const void *data)
+{
+ const char *label = data;
+ struct hd_struct *part = dev_to_part(dev);
+
+ if (part->info && !strcmp(label, part->info->volname))
+ return 1;
+
+ return 0;
+}
#endif
/*
@@ -190,6 +210,8 @@
* a partition with a known unique id.
* 8) <major>:<minor> major and minor number of the device separated by
* a colon.
+ * 9) PARTLABEL=<name> with name being the GPT partition label.
+ * MSDOS partitions do not support labels!
*
* If name doesn't have fall into the categories above, we return (0,0).
* block_class is used to check if something is a disk name. If the disk
@@ -211,6 +233,17 @@
if (!res)
goto fail;
goto done;
+ } else if (strncmp(name, "PARTLABEL=", 10) == 0) {
+ struct device *dev;
+
+ dev = class_find_device(&block_class, NULL, name + 10,
+ &match_dev_by_label);
+ if (!dev)
+ goto fail;
+
+ res = dev->devt;
+ put_device(dev);
+ goto done;
}
#endif
@@ -594,44 +627,23 @@
}
static bool is_tmpfs;
-static struct dentry *rootfs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+static int rootfs_init_fs_context(struct fs_context *fc)
{
- static unsigned long once;
- void *fill = ramfs_fill_super;
-
- if (test_and_set_bit(0, &once))
- return ERR_PTR(-ENODEV);
-
if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs)
- fill = shmem_fill_super;
+ return shmem_init_fs_context(fc);
- return mount_nodev(fs_type, flags, data, fill);
+ return ramfs_init_fs_context(fc);
}
-static struct file_system_type rootfs_fs_type = {
+struct file_system_type rootfs_fs_type = {
.name = "rootfs",
- .mount = rootfs_mount,
+ .init_fs_context = rootfs_init_fs_context,
.kill_sb = kill_litter_super,
};
-int __init init_rootfs(void)
+void __init init_rootfs(void)
{
- int err = register_filesystem(&rootfs_fs_type);
-
- if (err)
- return err;
-
if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] &&
- (!root_fs_names || strstr(root_fs_names, "tmpfs"))) {
- err = shmem_init();
+ (!root_fs_names || strstr(root_fs_names, "tmpfs")))
is_tmpfs = true;
- } else {
- err = init_ramfs_fs();
- }
-
- if (err)
- unregister_filesystem(&rootfs_fs_type);
-
- return err;
}