#include <linux/mount.h>
#include <linux/device.h>
#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/initrd.h>
+#include <linux/async.h>
+#include <linux/fs_struct.h>
+#include <linux/slab.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_fs_sb.h>
#include "do_mounts.h"
-extern int get_filesystem_list(char * buf);
-
int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
int root_mountflags = MS_RDONLY | MS_SILENT;
-char * __initdata root_device_name;
+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;
__setup("ro", readonly);
__setup("rw", readwrite);
-static dev_t try_name(char *name, int part)
+#ifdef CONFIG_BLOCK
+/**
+ * match_dev_by_uuid - callback for finding a partition using its uuid
+ * @dev: device passed in by the caller
+ * @data: opaque pointer to a 36 byte char array with a UUID
+ *
+ * Returns 1 if the device matches, and 0 otherwise.
+ */
+static int match_dev_by_uuid(struct device *dev, void *data)
{
- char path[64];
- char buf[32];
- int range;
- dev_t res;
- char *s;
- int len;
- int fd;
- unsigned int maj, min;
+ u8 *uuid = data;
+ struct hd_struct *part = dev_to_part(dev);
- /* read device number from .../dev */
+ if (!part->info)
+ goto no_match;
- sprintf(path, "/sys/block/%s/dev", name);
- fd = sys_open(path, 0, 0);
- if (fd < 0)
- goto fail;
- len = sys_read(fd, buf, 32);
- sys_close(fd);
- if (len <= 0 || len == 32 || buf[len - 1] != '\n')
- goto fail;
- buf[len - 1] = '\0';
- if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
- /*
- * Try the %u:%u format -- see print_dev_t()
- */
- res = MKDEV(maj, min);
- if (maj != MAJOR(res) || min != MINOR(res))
- goto fail;
- } else {
- /*
- * Nope. Try old-style "0321"
- */
- res = new_decode_dev(simple_strtoul(buf, &s, 16));
- if (*s)
- goto fail;
+ if (memcmp(uuid, part->info->uuid, sizeof(part->info->uuid)))
+ goto no_match;
+
+ return 1;
+no_match:
+ return 0;
+}
+
+
+/**
+ * devt_from_partuuid - looks up the dev_t of a partition by its 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)
+{
+ 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;
+ }
}
- /* if it's there and we are not looking for a partition - that's it */
- if (!part)
- return res;
+ /* Pack the requested UUID in the expected format. */
+ part_pack_uuid(uuid_str, uuid);
- /* otherwise read range from .../range */
- sprintf(path, "/sys/block/%s/range", name);
- fd = sys_open(path, 0, 0);
- if (fd < 0)
- goto fail;
- len = sys_read(fd, buf, 32);
- sys_close(fd);
- if (len <= 0 || len == 32 || buf[len - 1] != '\n')
- goto fail;
- buf[len - 1] = '\0';
- range = simple_strtoul(buf, &s, 10);
- if (*s)
- goto fail;
+ dev = class_find_device(&block_class, NULL, uuid, &match_dev_by_uuid);
+ if (!dev)
+ goto done;
- /* if partition is within range - we got it */
- if (part < range)
- return res + part;
-fail:
- return 0;
+ res = dev->devt;
+
+ /* 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;
}
+#endif
/*
* Convert a name into device number. We accept the following variants:
* of partition - device number of disk plus the partition number
* 5) /dev/<disk_name>p<decimal> - same as the above, that form is
* 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.
- * Sysfs is used to check if something is a disk name - it has
- * all known disks under bus/block/devices. If the disk name
- * contains slashes, name of sysfs node has them replaced with
- * bangs. try_name() does the actual checks, assuming that sysfs
- * is mounted on rootfs /sys.
+ * 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
+ * name contains slashes, the device name has them replaced with
+ * bangs.
*/
dev_t name_to_dev_t(char *name)
dev_t res = 0;
int part;
-#ifdef CONFIG_SYSFS
- int mkdir_err = sys_mkdir("/sys", 0700);
- if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
- goto out;
+#ifdef CONFIG_BLOCK
+ if (strncmp(name, "PARTUUID=", 9) == 0) {
+ name += 9;
+ res = devt_from_partuuid(name);
+ if (!res)
+ goto fail;
+ goto done;
+ }
#endif
if (strncmp(name, "/dev/", 5) != 0) {
}
goto done;
}
+
name += 5;
res = Root_NFS;
if (strcmp(name, "nfs") == 0)
for (p = s; *p; p++)
if (*p == '/')
*p = '!';
- res = try_name(s, 0);
+ res = blk_lookup_devt(s, 0);
if (res)
goto done;
+ /*
+ * try non-existent, but valid partition, which may only exist
+ * after revalidating the disk, like partitioned md devices
+ */
while (p > s && isdigit(p[-1]))
p--;
if (p == s || !*p || *p == '0')
goto fail;
+
+ /* try disk name without <part number> */
part = simple_strtoul(p, NULL, 10);
*p = '\0';
- res = try_name(s, part);
+ res = blk_lookup_devt(s, part);
if (res)
goto done;
+ /* try disk name without p<part number> */
if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
goto fail;
p[-1] = '\0';
- res = try_name(s, part);
+ res = blk_lookup_devt(s, part);
+ if (res)
+ goto done;
+
+fail:
+ return 0;
done:
-#ifdef CONFIG_SYSFS
- sys_umount("/sys", 0);
-out:
- if (!mkdir_err)
- sys_rmdir("/sys");
-#endif
return res;
-fail:
- res = 0;
- goto done;
}
static int __init root_dev_setup(char *line)
static int __init do_mount_root(char *name, char *fs, int flags, void *data)
{
+ struct super_block *s;
int err = sys_mount(name, "/root", fs, flags, data);
if (err)
return err;
- sys_chdir("/root");
- ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
- printk("VFS: Mounted root (%s filesystem)%s.\n",
- current->fs->pwdmnt->mnt_sb->s_type->name,
- current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ?
- " readonly" : "");
+ sys_chdir((const char __user __force *)"/root");
+ s = current->fs->pwd.dentry->d_sb;
+ ROOT_DEV = s->s_dev;
+ printk(KERN_INFO
+ "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n",
+ s->s_type->name,
+ s->s_flags & MS_RDONLY ? " readonly" : "",
+ MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
return 0;
}
void __init mount_block_root(char *name, int flags)
{
- char *fs_names = __getname();
+ char *fs_names = __getname_gfp(GFP_KERNEL
+ | __GFP_NOTRACK_FALSE_POSITIVE);
char *p;
#ifdef CONFIG_BLOCK
char b[BDEVNAME_SIZE];
#ifdef CONFIG_BLOCK
__bdevname(ROOT_DEV, b);
#endif
- printk("VFS: Cannot open root device \"%s\" or %s\n",
- root_device_name, b);
+ printk("VFS: Cannot open root device \"%s\" or %s: error %d\n",
+ root_device_name, b, err);
printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
printk_all_partitions();
+#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
+ printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify "
+ "explicit textual name for \"root=\" boot option.\n");
+#endif
panic("VFS: Unable to mount root fs on %s", b);
}
}
#ifdef CONFIG_ROOT_NFS
+
+#define NFSROOT_TIMEOUT_MIN 5
+#define NFSROOT_TIMEOUT_MAX 30
+#define NFSROOT_RETRY_MAX 5
+
static int __init mount_nfs_root(void)
{
- void *data = nfs_root_data();
+ char *root_dev, *root_data;
+ unsigned int timeout;
+ int try, err;
- create_dev("/dev/root", ROOT_DEV);
- if (data &&
- do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
- return 1;
+ err = nfs_root_data(&root_dev, &root_data);
+ if (err != 0)
+ return 0;
+
+ /*
+ * The server or network may not be ready, so try several
+ * times. Stop after a few tries in case the client wants
+ * to fall back to other boot methods.
+ */
+ timeout = NFSROOT_TIMEOUT_MIN;
+ for (try = 1; ; try++) {
+ err = do_mount_root(root_dev, "nfs",
+ root_mountflags, root_data);
+ if (err == 0)
+ return 1;
+ if (try > NFSROOT_RETRY_MAX)
+ break;
+
+ /* Wait, in case the server refused us immediately */
+ ssleep(timeout);
+ timeout <<= 1;
+ if (timeout > NFSROOT_TIMEOUT_MAX)
+ timeout = NFSROOT_TIMEOUT_MAX;
+ }
return 0;
}
#endif
void __init mount_root(void)
{
#ifdef CONFIG_ROOT_NFS
- if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
+ if (ROOT_DEV == Root_NFS) {
if (mount_nfs_root())
return;
ssleep(root_delay);
}
- /* wait for the known devices to complete their probing */
- while (driver_probe_done() != 0)
- msleep(100);
+ /*
+ * wait for the known devices to complete their probing
+ *
+ * Note: this is a potential source of long boot delays.
+ * For example, it is not atypical to wait 5 seconds here
+ * for the touchpad of a laptop to initialize.
+ */
+ wait_for_device_probe();
md_run_setup();
if (saved_root_name[0]) {
root_device_name = saved_root_name;
- if (!strncmp(root_device_name, "mtd", 3)) {
+ if (!strncmp(root_device_name, "mtd", 3) ||
+ !strncmp(root_device_name, "ubi", 3)) {
mount_block_root(root_device_name, root_mountflags);
goto out;
}
while (driver_probe_done() != 0 ||
(ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
msleep(100);
+ async_synchronize_full();
}
is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
mount_root();
out:
+ devtmpfs_mount("dev");
sys_mount(".", "/", NULL, MS_MOVE, NULL);
- sys_chroot(".");
+ sys_chroot((const char __user __force *)".");
}
-
projects / linux-flexiantxendom0-3.2.10.git / blobdiff