Merge git://github.com/herbertx/crypto

[pandora-kernel.git] / init / do_mounts.c

diff --git a/init/do_mounts.c b/init/do_mounts.c
index c0851a8..0f6e1d9 100644 (file)
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -28,7 +28,7 @@ int __initdata rd_doload;     /* 1 = load RAM disk, 0 = don't load */
 int root_mountflags = MS_RDONLY | MS_SILENT;
 static char * __initdata root_device_name;
 static char __initdata saved_root_name[64];
-static int __initdata root_wait;
+static int root_wait;
 
 dev_t ROOT_DEV;
 
@@ -85,12 +85,15 @@ no_match:
 
 /**
  * devt_from_partuuid - looks up the dev_t of a partition by its UUID
- * @uuid:      36 byte char array containing a hex ascii UUID
+ * @uuid:      min 36 byte char array containing a hex ascii UUID
  *
  * The function will return the first partition which contains a matching
  * UUID value in its partition_meta_info struct.  This does not search
  * by filesystem UUIDs.
  *
+ * If @uuid is followed by a "/PARTNROFF=%d", then the number will be
+ * extracted and used as an offset from the partition identified by the UUID.
+ *
  * Returns the matching dev_t on success or 0 on failure.
  */
 static dev_t devt_from_partuuid(char *uuid_str)
@@ -98,6 +101,28 @@ static dev_t devt_from_partuuid(char *uuid_str)
        dev_t res = 0;
        struct device *dev = NULL;
        u8 uuid[16];
+       struct gendisk *disk;
+       struct hd_struct *part;
+       int offset = 0;
+
+       if (strlen(uuid_str) < 36)
+               goto done;
+
+       /* Check for optional partition number offset attributes. */
+       if (uuid_str[36]) {
+               char c = 0;
+               /* Explicitly fail on poor PARTUUID syntax. */
+               if (sscanf(&uuid_str[36],
+                          "/PARTNROFF=%d%c", &offset, &c) != 1) {
+                       printk(KERN_ERR "VFS: PARTUUID= is invalid.\n"
+                        "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n");
+                       if (root_wait)
+                               printk(KERN_ERR
+                                    "Disabling rootwait; root= is invalid.\n");
+                       root_wait = 0;
+                       goto done;
+               }
+       }
 
        /* Pack the requested UUID in the expected format. */
        part_pack_uuid(uuid_str, uuid);
@@ -107,8 +132,21 @@ static dev_t devt_from_partuuid(char *uuid_str)
                goto done;
 
        res = dev->devt;
-       put_device(dev);
 
+       /* Attempt to find the partition by offset. */
+       if (!offset)
+               goto no_offset;
+
+       res = 0;
+       disk = part_to_disk(dev_to_part(dev));
+       part = disk_get_part(disk, dev_to_part(dev)->partno + offset);
+       if (part) {
+               res = part_devt(part);
+               put_device(part_to_dev(part));
+       }
+
+no_offset:
+       put_device(dev);
 done:
        return res;
 }
@@ -126,6 +164,8 @@ done:
  *        used when disk name of partitioned disk ends on a digit.
  *     6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
  *        unique id of a partition if the partition table provides it.
+ *     7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to
+ *        a partition with a known unique id.
  *
  *     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
@@ -143,8 +183,6 @@ dev_t name_to_dev_t(char *name)
 #ifdef CONFIG_BLOCK
        if (strncmp(name, "PARTUUID=", 9) == 0) {
                name += 9;
-               if (strlen(name) != 36)
-                       goto fail;
                res = devt_from_partuuid(name);
                if (!res)
                        goto fail;