Driver core: convert block from raw kobjects to core devices

This moves the block devices to /sys/class/block. It will create a
flat list of all block devices, with the disks and partitions in one
directory. For compatibility /sys/block is created and contains symlinks
to the disks.

  /sys/class/block
  |-- sda -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda
  |-- sda1 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda1
  |-- sda10 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda10
  |-- sda5 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda5
  |-- sda6 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda6
  |-- sda7 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda7
  |-- sda8 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda8
  |-- sda9 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda9
  `-- sr0 -> ../../devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0

  /sys/block/
  |-- sda -> ../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda
  `-- sr0 -> ../devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 8 insertions, 100 deletions

diff --git a/init/do_mounts.c b/init/do_mounts.c
index 4efa1e5385e3..2ae5b8462399 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -55,69 +55,6 @@ static int __init readwrite(char *str)
 __setup("ro", readonly);
 __setup("rw", readwrite);
 
-static dev_t try_name(char *name, int part)
-{
-        char path[64];
-        char buf[32];
-        int range;
-        dev_t res;
-        char *s;
-        int len;
-        int fd;
-        unsigned int maj, min;
-
-        /* read device number from .../dev */
-
-        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 it's there and we are not looking for a partition - that's it */
-        if (!part)
-                return res;
-
-        /* 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;
-
-        /* if partition is within range - we got it */
-        if (part < range)
-                return res + part;
-fail:
-        return 0;
-}
-
 /*
  *      Convert a name into device number.  We accept the following variants:
  *
@@ -129,12 +66,10 @@ fail:
  *      5) /dev/<disk_name>p<decimal> - same as the above, that form is
  *         used when disk name of partitioned disk ends on a digit.
  *
- *      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)
@@ -142,13 +77,6 @@ dev_t name_to_dev_t(char *name)
         char s[32];
         char *p;
         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;
-#endif
 
         if (strncmp(name, "/dev/", 5) != 0) {
                 unsigned maj, min;
@@ -164,6 +92,7 @@ dev_t name_to_dev_t(char *name)
                 }
                 goto done;
         }
+
         name += 5;
         res = Root_NFS;
         if (strcmp(name, "nfs") == 0)
@@ -178,35 +107,14 @@ dev_t name_to_dev_t(char *name)
         for (p = s; *p; p++)
                 if (*p == '/')
                         *p = '!';
-        res = try_name(s, 0);
+        res = blk_lookup_devt(s);
         if (res)
                 goto done;
 
-        while (p > s && isdigit(p[-1]))
-                p--;
-        if (p == s || !*p || *p == '0')
-                goto fail;
-        part = simple_strtoul(p, NULL, 10);
-        *p = '\0';
-        res = try_name(s, part);
-        if (res)
-                goto done;
-
-        if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
-                goto fail;
-        p[-1] = '\0';
-        res = try_name(s, part);
+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)