7a121e92e
Mike Frysinger
2005-05-09
Subject
import base_device.c for fsck
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e2fsprogs/base_device.c+147 -0
| @@ -0,0 +1,147 @@ | |
| + | /* |
| + | * base_device.c |
| + | * |
| + | * Return the "base device" given a particular device; this is used to |
| + | * assure that we only fsck one partition on a particular drive at any |
| + | * one time. Otherwise, the disk heads will be seeking all over the |
| + | * place. If the base device can not be determined, return NULL. |
| + | * |
| + | * The base_device() function returns an allocated string which must |
| + | * be freed. |
| + | * |
| + | * Written by Theodore Ts'o, <[email protected]> |
| + | * |
| + | * Copyright (C) 2000 Theodore Ts'o. |
| + | * |
| + | * %Begin-Header% |
| + | * This file may be redistributed under the terms of the GNU Public |
| + | * License. |
| + | * %End-Header% |
| + | */ |
| + | #include <stdio.h> |
| + | #include <unistd.h> |
| + | #include <stdlib.h> |
| + | #include <ctype.h> |
| + | #include <string.h> |
| + | |
| + | #include "busybox.h" |
| + | |
| + | #ifdef CONFIG_FEATURE_DEVFS |
| + | /* |
| + | * Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3 |
| + | * pathames. |
| + | */ |
| + | static const char *devfs_hier[] = { |
| + | "host", "bus", "target", "lun", 0 |
| + | }; |
| + | #endif |
| + | |
| + | char *base_device(const char *device) |
| + | { |
| + | char *str, *cp; |
| + | #ifdef CONFIG_FEATURE_DEVFS |
| + | const char **hier, *disk; |
| + | int len; |
| + | #endif |
| + | |
| + | cp = str = bb_xstrdup(device); |
| + | |
| + | /* Skip over /dev/; if it's not present, give up. */ |
| + | if (strncmp(cp, "/dev/", 5) != 0) |
| + | goto errout; |
| + | cp += 5; |
| + | |
| + | #if 0 /* this is for old stuff no one uses anymore ? */ |
| + | /* Skip over /dev/dsk/... */ |
| + | if (strncmp(cp, "dsk/", 4) == 0) |
| + | cp += 4; |
| + | #endif |
| + | |
| + | /* |
| + | * For md devices, we treat them all as if they were all |
| + | * on one disk, since we don't know how to parallelize them. |
| + | */ |
| + | if (cp[0] == 'm' && cp[1] == 'd') { |
| + | *(cp+2) = 0; |
| + | return str; |
| + | } |
| + | |
| + | /* Handle DAC 960 devices */ |
| + | if (strncmp(cp, "rd/", 3) == 0) { |
| + | cp += 3; |
| + | if (cp[0] != 'c' || cp[2] != 'd' || |
| + | !isdigit(cp[1]) || !isdigit(cp[3])) |
| + | goto errout; |
| + | *(cp+4) = 0; |
| + | return str; |
| + | } |
| + | |
| + | /* Now let's handle /dev/hd* and /dev/sd* devices.... */ |
| + | if ((cp[0] == 'h' || cp[0] == 's') && (cp[1] == 'd')) { |
| + | cp += 2; |
| + | /* If there's a single number after /dev/hd, skip it */ |
| + | if (isdigit(*cp)) |
| + | cp++; |
| + | /* What follows must be an alpha char, or give up */ |
| + | if (!isalpha(*cp)) |
| + | goto errout; |
| + | *(cp + 1) = 0; |
| + | return str; |
| + | } |
| + | |
| + | #ifdef CONFIG_FEATURE_DEVFS |
| + | /* Now let's handle devfs (ugh) names */ |
| + | len = 0; |
| + | if (strncmp(cp, "ide/", 4) == 0) |
| + | len = 4; |
| + | if (strncmp(cp, "scsi/", 5) == 0) |
| + | len = 5; |
| + | if (len) { |
| + | cp += len; |
| + | /* |
| + | * Now we proceed down the expected devfs hierarchy. |
| + | * i.e., .../host1/bus2/target3/lun4/... |
| + | * If we don't find the expected token, followed by |
| + | * some number of digits at each level, abort. |
| + | */ |
| + | for (hier = devfs_hier; *hier; hier++) { |
| + | len = strlen(*hier); |
| + | if (strncmp(cp, *hier, len) != 0) |
| + | goto errout; |
| + | cp += len; |
| + | while (*cp != '/' && *cp != 0) { |
| + | if (!isdigit(*cp)) |
| + | goto errout; |
| + | cp++; |
| + | } |
| + | cp++; |
| + | } |
| + | *(cp - 1) = 0; |
| + | return str; |
| + | } |
| + | |
| + | /* Now handle devfs /dev/disc or /dev/disk names */ |
| + | disk = 0; |
| + | if (strncmp(cp, "discs/", 6) == 0) |
| + | disk = "disc"; |
| + | else if (strncmp(cp, "disks/", 6) == 0) |
| + | disk = "disk"; |
| + | if (disk) { |
| + | cp += 6; |
| + | if (strncmp(cp, disk, 4) != 0) |
| + | goto errout; |
| + | cp += 4; |
| + | while (*cp != '/' && *cp != 0) { |
| + | if (!isdigit(*cp)) |
| + | goto errout; |
| + | cp++; |
| + | } |
| + | *cp = 0; |
| + | return str; |
| + | } |
| + | #endif |
| + | |
| + | errout: |
| + | free(str); |
| + | return NULL; |
| + | } |