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authorThorsten Glaser <tg@mirbsd.org>2010-11-20 22:19:06 +0000
committerWaldemar Brodkorb <wbx@openadk.org>2010-11-20 23:54:37 +0100
commit2140694397c262c79ede4b6e3bb08bc2e5f82865 (patch)
tree7db3d7150dd312fd2db7a4b1631f6fb892d47306 /target/linux/patches
parent2aa24b0a0530a07a40f5bf858048dad5c8c61bf5 (diff)
convert to UUID; make panic-reboot-time a flag; prevent automatic fsck
note: uuid.patch currently still panics ☹ Signed-off-by: Thorsten Glaser <tg@mirbsd.org>
Diffstat (limited to 'target/linux/patches')
-rw-r--r--target/linux/patches/2.6.36/uuid.patch174
1 files changed, 174 insertions, 0 deletions
diff --git a/target/linux/patches/2.6.36/uuid.patch b/target/linux/patches/2.6.36/uuid.patch
new file mode 100644
index 000000000..2e6c61df9
--- /dev/null
+++ b/target/linux/patches/2.6.36/uuid.patch
@@ -0,0 +1,174 @@
+# DP: Add support for specifying the root device using UUIDs on the
+# DP: kernel command line like this without the need for an initrd:
+# DP: linux ... root=UUID=ce40d6b2-18eb-4a75-aefe-7ddb0995ce63
+# DP:
+# DP: Written © 2010 by Thorsten Glaser <tg@debian.org>
+# DP: Idea from 1999 by David Balazic <david.balazic@uni-mb.si>
+
+--- linux-2.6.36/block/genhd.c~ Wed Oct 20 22:30:22 2010
++++ linux-2.6.36/block/genhd.c Sat Nov 20 23:14:03 2010
+@@ -35,7 +35,7 @@ struct kobject *block_depr;
+ static DEFINE_MUTEX(ext_devt_mutex);
+ static DEFINE_IDR(ext_devt_idr);
+
+-static struct device_type disk_type;
++struct device_type disk_type;
+
+ /**
+ * disk_get_part - get partition
+@@ -1019,7 +1019,7 @@ static char *block_devnode(struct device *dev, mode_t
+ return NULL;
+ }
+
+-static struct device_type disk_type = {
++struct device_type disk_type = {
+ .name = "disk",
+ .groups = disk_attr_groups,
+ .release = disk_release,
+--- linux-2.6.36/init/do_mounts.c~ Wed Oct 20 22:30:22 2010
++++ linux-2.6.36/init/do_mounts.c Sat Nov 20 23:16:07 2010
+@@ -32,6 +32,84 @@ static int __initdata root_wait;
+
+ dev_t ROOT_DEV;
+
++#ifdef CONFIG_EXT2_FS
++/* support for root=UUID=ce40d6b2-18eb-4a75-aefe-7ddb0995ce63 bootargs */
++
++#include <linux/buffer_head.h>
++#include <linux/ext2_fs.h>
++
++__u8 root_dev_label[16];
++int root_dev_type; /* 0 = normal (/dev/hda1, 0301); 1 = UUID; 3 = bad */
++
++/* imported from block/genhd.c after removing its static qualifier */
++extern struct device_type disk_type;
++
++static __u8 __init fromhex(char c)
++{
++ if (c >= '0' && c <= '9')
++ return (c - '0');
++ c &= ~32;
++ if (c >= 'A' && c <= 'F')
++ return (c - 'A' + 10);
++ return (0xFF);
++}
++
++static void __init parse_uuid(const char *s)
++{
++ int i;
++ __u8 j, k;
++
++ if (strlen(s) != 36 || s[8] != '-' || s[13] != '-' ||
++ s[18] != '-' || s[23] != '-')
++ goto bad_uuid;
++ for (i = 0; i < 16; i++) {
++ if (*s == '-')
++ ++s;
++ j = fromhex(*s++);
++ k = fromhex(*s++);
++ if (j == 0xFF || k == 0xFF)
++ goto bad_uuid;
++ root_dev_label[i] = (j << 4) | k;
++ }
++ return;
++ bad_uuid:
++ /* we cannot panic here, defer */
++ root_dev_type = 3;
++}
++
++static int __init check_dev(dev_t devt, int blocksize)
++{
++ /* most of this taken from fs/ext2/super.c */
++
++ struct buffer_head * bh;
++ struct ext2_super_block * es;
++ struct block_device *bdev;
++ unsigned long sb_block = 1;
++ unsigned long logic_sb_block;
++ unsigned long offset = 0;
++ int rv = 0;
++
++ bdev = bdget(devt);
++
++ if (blocksize != BLOCK_SIZE) {
++ logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
++ offset = (sb_block*BLOCK_SIZE) % blocksize;
++ } else {
++ logic_sb_block = sb_block;
++ }
++
++ if (!(bh = __bread(bdev, logic_sb_block, blocksize)))
++ return (0);
++ es = (struct ext2_super_block *)(((char *)bh->b_data) + offset);
++ if (le16_to_cpu(es->s_magic) == EXT2_SUPER_MAGIC) {
++ if (!memcmp(es->s_uuid, root_dev_label, 16))
++ rv = 1;
++ }
++ brelse(bh);
++ return (rv);
++}
++#endif /* CONFIG_EXT2_FS for UUID support */
++
+ static int __init load_ramdisk(char *str)
+ {
+ rd_doload = simple_strtol(str,NULL,0) & 3;
+@@ -148,6 +226,13 @@ done:
+ static int __init root_dev_setup(char *line)
+ {
+ strlcpy(saved_root_name, line, sizeof(saved_root_name));
++#ifdef CONFIG_EXT2_FS
++ root_dev_type = 0;
++ if (!strncmp(line, "UUID=", 5)) {
++ root_dev_type = 1;
++ parse_uuid(line + 5);
++ }
++#endif /* CONFIG_EXT2_FS for UUID support */
+ return 1;
+ }
+
+@@ -333,6 +418,45 @@ void __init change_floppy(char *fmt, ...)
+
+ void __init mount_root(void)
+ {
++#ifdef CONFIG_EXT2_FS
++ /* UUID support */
++ if (root_dev_type == 1) {
++ int blocksize;
++
++ /* from block/genhd.c printk_all_partitions */
++ struct class_dev_iter iter;
++ struct device *dev;
++
++ class_dev_iter_init(&iter, &block_class, NULL, &disk_type);
++ while (root_dev_type && (dev = class_dev_iter_next(&iter))) {
++ struct gendisk *disk = dev_to_disk(dev);
++ struct disk_part_iter piter;
++ struct hd_struct *part;
++ if (get_capacity(disk) == 0 ||
++ (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
++ continue;
++ blocksize = queue_logical_block_size(disk->queue);
++
++ disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
++ while (root_dev_type && (part = disk_part_iter_next(&piter))) {
++ /* avoid empty or too small partitions */
++ if (part->nr_sects < 8)
++ continue;
++ if (check_dev(part_devt(part), blocksize)) {
++ ROOT_DEV = part_devt(part);
++ root_dev_type = 0;
++ }
++ }
++ disk_part_iter_exit(&piter);
++ }
++ class_dev_iter_exit(&iter);
++ }
++ if (root_dev_type == 1)
++ printk(KERN_ERR "VFS: Unable to find root by UUID %s.\n", saved_root_name + 5);
++ else if (root_dev_type == 3)
++ panic("Badly formatted UUID %s was supplied as kernel parameter root", saved_root_name + 5);
++#endif /* CONFIG_EXT2_FS for UUID support */
++
+ #ifdef CONFIG_ROOT_NFS
+ if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
+ if (mount_nfs_root())