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authorKay Sievers <kay.sievers@vrfy.org>2007-05-21 22:08:01 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2008-01-24 20:40:36 -0800
commitedfaa7c36574f1bf09c65ad602412db9da5f96bf (patch)
treed591b80ff9229e4845e41d68e2f4c5aadb017027 /init/do_mounts.c
parent09f82ea92822a7bbb7e816508abbda47ed54a77f (diff)
downloadlinux-aarch64-edfaa7c36574f1bf09c65ad602412db9da5f96bf.tar.gz
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>
Diffstat (limited to 'init/do_mounts.c')
-rw-r--r--init/do_mounts.c108
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)