block/partitions/check.c

   1 /*
   2  *  fs/partitions/check.c
   3  *
   4  *  Code extracted from drivers/block/genhd.c
   5  *  Copyright (C) 1991-1998  Linus Torvalds
   6  *  Re-organised Feb 1998 Russell King
   7  *
   8  *  We now have independent partition support from the
   9  *  block drivers, which allows all the partition code to
  10  *  be grouped in one location, and it to be mostly self
  11  *  contained.
  12  *
  13  *  Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
  14  */
  15
  16 #include <linux/slab.h>
  17 #include <linux/ctype.h>
  18 #include <linux/genhd.h>
  19
  20 #include "check.h"
  21
  22 #include "acorn.h"
  23 #include "amiga.h"
  24 #include "atari.h"
  25 #include "ldm.h"
  26 #include "mac.h"
  27 #include "msdos.h"
  28 #include "osf.h"
  29 #include "sgi.h"
  30 #include "sun.h"
  31 #include "ibm.h"
  32 #include "ultrix.h"
  33 #include "efi.h"
  34 #include "karma.h"
  35 #include "sysv68.h"
  36
  37 int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
  38
  39 static int (*check_part[])(struct parsed_partitions *) = {
  40         /*
  41          * Probe partition formats with tables at disk address 0
  42          * that also have an ADFS boot block at 0xdc0.
  43          */
  44 #ifdef CONFIG_ACORN_PARTITION_ICS
  45         adfspart_check_ICS,
  46 #endif
  47 #ifdef CONFIG_ACORN_PARTITION_POWERTEC
  48         adfspart_check_POWERTEC,
  49 #endif
  50 #ifdef CONFIG_ACORN_PARTITION_EESOX
  51         adfspart_check_EESOX,
  52 #endif
  53
  54         /*
  55          * Now move on to formats that only have partition info at
  56          * disk address 0xdc0.  Since these may also have stale
  57          * PC/BIOS partition tables, they need to come before
  58          * the msdos entry.
  59          */
  60 #ifdef CONFIG_ACORN_PARTITION_CUMANA
  61         adfspart_check_CUMANA,
  62 #endif
  63 #ifdef CONFIG_ACORN_PARTITION_ADFS
  64         adfspart_check_ADFS,
  65 #endif
  66
  67 #ifdef CONFIG_EFI_PARTITION
  68         efi_partition,          /* this must come before msdos */
  69 #endif
  70 #ifdef CONFIG_SGI_PARTITION
  71         sgi_partition,
  72 #endif
  73 #ifdef CONFIG_LDM_PARTITION
  74         ldm_partition,          /* this must come before msdos */
  75 #endif
  76 #ifdef CONFIG_MSDOS_PARTITION
  77         msdos_partition,
  78 #endif
  79 #ifdef CONFIG_OSF_PARTITION
  80         osf_partition,
  81 #endif
  82 #ifdef CONFIG_SUN_PARTITION
  83         sun_partition,
  84 #endif
  85 #ifdef CONFIG_AMIGA_PARTITION
  86         amiga_partition,
  87 #endif
  88 #ifdef CONFIG_ATARI_PARTITION
  89         atari_partition,
  90 #endif
  91 #ifdef CONFIG_MAC_PARTITION
  92         mac_partition,
  93 #endif
  94 #ifdef CONFIG_ULTRIX_PARTITION
  95         ultrix_partition,
  96 #endif
  97 #ifdef CONFIG_IBM_PARTITION
  98         ibm_partition,
  99 #endif
 100 #ifdef CONFIG_KARMA_PARTITION
 101         karma_partition,
 102 #endif
 103 #ifdef CONFIG_SYSV68_PARTITION
 104         sysv68_partition,
 105 #endif
 106         NULL
 107 };
 108
 109 struct parsed_partitions *
 110 check_partition(struct gendisk *hd, struct block_device *bdev)
 111 {
 112         struct parsed_partitions *state;
 113         int i, res, err;
 114
 115         state = kzalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
 116         if (!state)
 117                 return NULL;
 118         state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
 119         if (!state->pp_buf) {
 120                 kfree(state);
 121                 return NULL;
 122         }
 123         state->pp_buf[0] = '\0';
 124
 125         state->bdev = bdev;
 126         disk_name(hd, 0, state->name);
 127         snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
 128         if (isdigit(state->name[strlen(state->name)-1]))
 129                 sprintf(state->name, "p");
 130
 131         state->limit = disk_max_parts(hd);
 132         i = res = err = 0;
 133         while (!res && check_part[i]) {
 134                 memset(&state->parts, 0, sizeof(state->parts));
 135                 res = check_part[i++](state);
 136                 if (res < 0) {
 137                         /* We have hit an I/O error which we don't report now.
 138                         * But record it, and let the others do their job.
 139                         */
 140                         err = res;
 141                         res = 0;
 142                 }
 143
 144         }
 145         if (res > 0) {
 146                 printk(KERN_INFO "%s", state->pp_buf);
 147
 148                 free_page((unsigned long)state->pp_buf);
 149                 return state;
 150         }
 151         if (state->access_beyond_eod)
 152                 err = -ENOSPC;
 153         if (err)
 154         /* The partition is unrecognized. So report I/O errors if there were any */
 155                 res = err;
 156         if (!res)
 157                 strlcat(state->pp_buf, " unknown partition table\n", PAGE_SIZE);
 158         else if (warn_no_part)
 159                 strlcat(state->pp_buf, " unable to read partition table\n", PAGE_SIZE);
 160
 161         printk(KERN_INFO "%s", state->pp_buf);
 162
 163         free_page((unsigned long)state->pp_buf);
 164         kfree(state);
 165         return ERR_PTR(res);
 166 }