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savefs.c
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savefs.c
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/*
// Program: Format
// Version: 0.91w
// (0.90b/c - avoid saving info when inappropriate - Eric Auer 2003)
// (0.91d - handle non-standard FAT12/FAT16 formats, debugging: Eric Auer 2003)
// (0.91k - w/o Convert_Huge_To_Integers, preserving bad sector list - EA 2004)
// (0.91l - adds Restore_File_System() written by EA 2004)
// (0.91p - merged "NOT saving..." messages, better FAT32 support - EA 2004)
// (0.91t - avoid double 100% display - EA 2005)
// (0.91u - mmapsec is unsigned long, not unsigned long unsigned :-P - 2005)
// (0.91w - remove spurious semicolon from line 139 (ignored if statement)
// Written By: Brian E. Reifsnyder
// Copyright: 2002-2005 under the terms of the GNU GPL, Version 2
// Module Name: savefs.c
// Module Description: Save File System Function
*/
#include <string.h> /* strncmp */
#include "format.h"
#include "floppy.h"
#include "driveio.h"
#include "btstrct.h"
#include "savefs.h"
#include "hdisk.h" /* Force_Drive_Recheck */
#include "userint.h" /* Display_Percentage_Formatted */
#include "msghlpr.h"
/* write one sector somewhere ;-) 0.91k */
void MMapWrite(unsigned long mmapsec, unsigned long * mmapbuf);
void MMapWrite(unsigned long mmapsec, unsigned long * mmapbuf)
{
memcpy((void *)§or_buffer[0], (void *)mmapbuf, 512);
if (debug_prog==TRUE) printf(" [map %lu] ", mmapsec);
if (Drive_IO(WRITE, mmapsec, -1) != 0)
printf(catgets(catalog, 23, 0, "Cannot write MIRROR MAP sector %lu - UNFORMAT spoiled!\n"),
mmapsec);
}
char const * const properties_not_preserved[] = {
"Filesystem properties will change, cannot preserve the\n",
"(possibly empty) old bad cluster list. Use a surface scan\n",
"tool or FORMAT /U if you want to update the bad cluster list.\n",
NULL
};
/* Save the old file system for possible recovery with unformat */
/* Used for SafeFormat and MIRROR, as you might have guessed... */
/* *** WARNING: This only works if (...) the root directory follows *** */
/* *** right after the 2nd FAT. This is NOT always true for FAT32! *** */
/* Changed in 0.91d to handle != 2 FATs and != 1 reserved/boot sector... */
/* Depends on the unformat data format whether this can be more flexible! */
/* Changed in 0.91p to save more of FAT32 data area (-> root dir) */
/* Changed in 0.91p to save all reserved sectors, not only 1 boot sector */
/* New 0.91r: Overwriting used data clusters allowed only for SafeFormat */
void Save_File_System(int overwrite)
{
int bad_boot_sector = TRUE;
int end_of_root_directory_flag;
unsigned long mirror_map[512/4]; /* 0.91k: only 1 sector for ANY FAT type */
unsigned pointer = 0;
unsigned long offset_from_end;
unsigned long destination_sector;
unsigned long source_sector;
unsigned long last_used_sector; /* BadClustPreserve returns this */
unsigned long mirror_beginning;
unsigned long mirror_map_beginning;
unsigned long mirror_map_size;
unsigned long mirror_size;
unsigned long mirror_map_sector;
unsigned long number_of_bytes_in_mirror_map;
unsigned long number_of_logical_sectors_on_drive;
unsigned long number_of_root_directory_entries;
unsigned long beginning_of_fat;
unsigned long beginning_of_root_directory;
unsigned long sectors_per_fat;
unsigned long reserved_sectors; /* usually 1 - boot sector [0e]w */
unsigned long number_of_fats; /* usually 2, but can be 1 [10]b */
unsigned long sectors_per_cluster; /* 0.91k */
unsigned long end_of_root_directory;
#define MAXCHUNKSIZE 16 /* could use one huge_sector_buffer completely */
unsigned long chunksize; /* 0.91o optimization */
unsigned long percentage = 0;
int fat_type = param.fat_type; /* Save_File_System default, from def. BPB */
#define BSWord(ofs) ( (unsigned int *)(§or_buffer[ofs]) )[0]
#define BSLong(ofs) ( (unsigned long *)(§or_buffer[ofs]) )[0]
/* write one sector of the mirror map whenever the buffer gets full 0.91k */
#define MMapCheckWrite if (pointer == (512/4)) { \
if ((debug_prog==TRUE) && (source_sector >= beginning_of_root_directory)) \
printf("\n"); \
MMapWrite(mirror_map_sector, &mirror_map[0]); \
mirror_map_sector++; \
pointer = 0; \
}
offset_from_end = (param.drive_type == HARD) ? 20 : 5;
/* Get the boot sector, compute the FAT size, compute the root dir size,*/
/* and get the end of the logical drive. */
Drive_IO(READ,0,1);
if ( (sector_buffer[510]==0x55) && (sector_buffer[511]==0xaa) )
{
bad_boot_sector = FALSE;
if ( BSWord(0x0b) != 512 )
{
printf(catgets(catalog, 23, 1, "Not 512 bytes / sector. Cannot save UNFORMAT data.\n"));
bad_boot_sector = TRUE;
}
number_of_fats = sector_buffer[0x10];
if ( (number_of_fats < 1) || (number_of_fats > 2) )
{
printf(catgets(catalog, 23, 2, "Not 1 or 2 FAT copies. Cannot save UNFORMAT data.\n"));
bad_boot_sector = TRUE;
}
reserved_sectors = BSWord(0x0e);
if ((param.fat_type != FAT32) && (reserved_sectors != 1))
{
printf(catgets(catalog, 23, 3, "WARNING: Number of reserved / boot sectors is %u, not 1.\n"),
reserved_sectors);
if ((reserved_sectors < 1) || (reserved_sectors > 64))
bad_boot_sector = TRUE;
}
if ((param.fat_type == FAT32) &&
(reserved_sectors != parameter_block.bpb.reserved_sectors))
{
printf(catgets(catalog, 23, 4, "WARNING: Reserved sectors are %u but will be %u after format.\n"),
reserved_sectors, parameter_block.bpb.reserved_sectors);
if ((reserved_sectors < 1) || (reserved_sectors > 64)) /* no ; */
bad_boot_sector = TRUE;
}
number_of_root_directory_entries = BSWord(0x11);
if ( ( (number_of_root_directory_entries == 0) ||
(BSWord(0x16) == 0) ) /* FAT1x size zero? */
&& (fat_type != FAT32))
{
printf(catgets(catalog, 23, 5, " Must be FAT32, not %s!\n"),
(fat_type == FAT12) ? "FAT12" : "FAT16");
/* 0 root dir entries or FAT1x size in Save_File_System */
nomirror_wimp: /* common bailout point avoids duplicated code (0.91p) */
printf(catgets(catalog, 23, 6, " NOT saving unformat info, not preserving bad cluster list.\n"));
return;
}
if ( (number_of_root_directory_entries != 0) && (fat_type == FAT32) )
{
printf(catgets(catalog, 23, 7, "WARNING: FAT32 with FAT1x style extra Root Directory???\n"));
goto nomirror_wimp; /* 0.91p */
}
number_of_logical_sectors_on_drive = BSWord(0x13);
if (number_of_logical_sectors_on_drive==0)
number_of_logical_sectors_on_drive = /* if it was 0, use 32bit value */
BSLong(0x20);
sectors_per_fat = BSWord(0x16);
if (sectors_per_fat == 0)
{ /* FAT32 case: 32bit sectors per fat value */
sectors_per_fat = BSLong(0x24);
if (fat_type != FAT32)
{
printf(catgets(catalog, 23, 8, " Must be FAT32, not FAT1x!\n"));
goto nomirror_wimp; /* 0.91p */
}
}
else
{ /* FAT1x case: 16bit sectors per fat value nonzero */
if (number_of_root_directory_entries == 0)
{
printf(catgets(catalog, 23, 9, " FAT32 Root Directory but FAT1x FAT!\n"));
goto nomirror_wimp; /* 0.91p */
}
if (fat_type != ( (sectors_per_fat <= 12) ? FAT12 : FAT16 ))
{
printf(catgets(catalog, 23, 10, " %s size but supposed to be FAT32!\n"),
(sectors_per_fat <= 12) ? "FAT12" : "FAT16");
goto nomirror_wimp; /* 0.91p */
}
/* FAT12 is max 12 sectors, FAT16 min 16 sectors. Of course this */
/* goes wrong if the FAT12 fat is bigger than needed. To be really */
/* foolproof, one had to count clusters and compare to 4085... */
} /* FAT1x case: 16bit sectors per fat value nonzero */
/* cluster size, geometry, media descriptor and hidden sectors are */
/* not relevant for the UNFORMAT information */
if ( ((number_of_root_directory_entries & 15) != 0) ||
( (param.fat_type != FAT32) && (number_of_root_directory_entries < 16) ) ||
( (param.fat_type == FAT32) && (number_of_root_directory_entries != 0) ) ||
(sectors_per_fat < 1) ||
(number_of_logical_sectors_on_drive < 200) )
{ /* not plausible root directory or FAT or drive size */
printf(catgets(catalog, 23, 11, " Implausible Root Directory, FAT or drive size! Bad boot sector?\n"));
bad_boot_sector = TRUE; /* -ea */
} else {
if ( ( 1 + sectors_per_fat + (number_of_root_directory_entries >> 4) +
5 ) > ( number_of_logical_sectors_on_drive >> 1 ) ) /* estimate only */
{
printf(catgets(catalog, 23, 12, " Big FAT for little data? Bad boot sector?\n"));
bad_boot_sector = TRUE;
}
} /* root directory an FAT and drive size was plausible */
sectors_per_cluster = BSWord(0x0d) & 0xff;
if (!sectors_per_cluster) sectors_per_cluster = 256;
if (fat_type == FAT32)
{
beginning_of_root_directory = reserved_sectors +
#if 0
( (BSLong(0x2c)-2) * sectors_per_cluster ) + /* NOT USED YET */
#endif
( number_of_fats * (unsigned long)sectors_per_fat );
/* new 0.91p: */
if (sectors_per_cluster < 32) /* first root cluster < 512 dir entries big? */
{
end_of_root_directory = beginning_of_root_directory
+ 32 - 1; /* just backup first 16k of data area */
} else {
end_of_root_directory = beginning_of_root_directory
+ sectors_per_cluster - 1; /* just backup ONE root dir cluster */
}
if (BSLong(0x2c) != 2)
printf(catgets(catalog, 23, 13, "Root Directory NOT in 1st cluster, NOT saving it!\n"));
/* would have to change some code below to save it properly... */
}
else
{
beginning_of_root_directory = reserved_sectors +
(number_of_fats * (unsigned long)sectors_per_fat);
end_of_root_directory = beginning_of_root_directory +
(number_of_root_directory_entries/16) - 1;
/* (last sector which is still PART of the root directory) */
}
/* Compute the locations of the second FAT and the root directory */
/* *** We use the LAST FAT - root directory follows after it! *** */
beginning_of_fat = ((unsigned long)sectors_per_fat * (number_of_fats-1))
+ reserved_sectors;
} /* boot sector had 0x55 0xaa magic and looks sane */
/* If the boot sector is not any good, don't save the file system. */
if (bad_boot_sector==TRUE)
{
printf(catgets(catalog, 23, 14, " Drive looks unformatted, UNFORMAT information NOT saved.\n"));
/* not preserving "existing" bad cluster list either, of course! */
return;
}
if ((fat_type == param.fat_type) &&
(reserved_sectors == parameter_block.bpb.reserved_sectors) &&
(number_of_fats == parameter_block.bpb.number_of_fats) &&
(sectors_per_cluster == BPB_SECTORS_PER_CLUSTER(parameter_block.bpb)) &&
( (sectors_per_fat & 0xffff) ==
( (fat_type == FAT32) ? parameter_block.xbpb.fat_size_low
: parameter_block.bpb.sectors_per_fat ) )
)
{
/* *** printf(" Scanning existing FAT for bad cluster marks...\n"); */
last_used_sector = BadClustPreserve(); /* uses param...bpb values */
/* *** bad sectors are stored in our global bad sect list */
}
else
{
unsigned long scratch;
Print_Messages_With_Pauses(catalog, 24, properties_not_preserved);
if (reserved_sectors != parameter_block.bpb.reserved_sectors)
printf(catgets(catalog, 23, 15, "Number of reserved sectors differs: FOUND %lu / PLANNED %u.\n"),
reserved_sectors, parameter_block.bpb.reserved_sectors);
if (number_of_fats != parameter_block.bpb.number_of_fats)
printf(catgets(catalog, 23, 16, "Number of FATs differs: FOUND %lu / PLANNED %hu\n"),
number_of_fats, parameter_block.bpb.number_of_fats);
if (sectors_per_cluster != BPB_SECTORS_PER_CLUSTER(parameter_block.bpb))
printf(catgets(catalog, 23, 17, "Cluster size differs: FOUND %lu / PLANNED %hu (sectors)\n"),
sectors_per_cluster, BPB_SECTORS_PER_CLUSTER(parameter_block.bpb));
scratch = parameter_block.xbpb.fat_size_high;
scratch <<= 16;
scratch |= parameter_block.xbpb.fat_size_low;
if (param.fat_type != FAT32)
scratch = parameter_block.bpb.sectors_per_fat;
printf(catgets(catalog, 23, 18, "FAT size differs: FOUND %lu %s / PLANNED %lu %s\n"),
(BSWord(0x16)) ? BSWord(0x16) : BSLong(0x24),
(BSWord(0x16)) ? "FAT1x" : "FAT32",
scratch,
(param.fat_type == FAT32) ? "FAT32" : "FAT1x");
} /* filesystem parameter mismatch */
printf(catgets(catalog, 23, 39, " Saving UNFORMAT information...\n"));
/* Compute the beginning sector of the mirror map and the size of */
/* the mirror image. */
/* Always mirroring only ONE boot sector and ONE (the last) FAT. */
#if 0 /* pre 0.91p */
mirror_size = 1 + sectors_per_fat +
((fat_type != FAT32) ? (number_of_root_directory_entries/16)
: (sectors_per_cluster)); /* see above... */
#else
mirror_size = reserved_sectors + sectors_per_fat +
(1 + end_of_root_directory - beginning_of_root_directory);
#endif
mirror_map_size = ( (mirror_size+(88/8)+63) / 64 );
/* added +(88/8)+63, removed +1 (for better rounding) in 0.91d */
/* 84+4 bytes are header/trailer, plus 8 bytes per mirrored sector! */
/* each slot is 8 bytes, so there are 64 of them in each map sector */
mirror_beginning = ((number_of_logical_sectors_on_drive-1) - mirror_size)
- offset_from_end; /* -1 because last=num-1, correct? */
mirror_map_beginning = mirror_beginning - mirror_map_size;
/* select beginning to have space for mirror data, mirror map and offset */
if (mirror_map_beginning <= last_used_sector)
{
if (!overwrite)
{
printf(catgets(catalog, 23, 19, "MIRROR data would overwrite used clusters. Aborting."));
Exit(4,38); /* no space for MIRROR */
}
else
{
printf(catgets(catalog, 23, 20, "SafeFormat: have to trash %lu used data sectors!\n"),
1L + last_used_sector - mirror_map_beginning);
}
} /* SafeFormat may overwrite used clusters, but MIRROR may not */
/* Write the mirror map pointer to the last sectors of the logical drive. */
/* layout: 1. map... 2. boot 3. fat2... 4. root... 5. pointer */
Clear_Sector_Buffer();
((unsigned long *)§or_buffer[0])[0] = mirror_map_beginning;
memcpy((void *)§or_buffer[4], "AMSESLIFVASRORIMESAEP", 21);
/* pease mirorsav.fil sesam (?) */ /* Add pointer sector flag */
if (debug_prog==TRUE)
{
printf("[DEBUG] Writing mirror map pointer to sector -> %lu\n",
((number_of_logical_sectors_on_drive-1) - offset_from_end) );
/* -1 correct??? */
printf("[DEBUG] Mirror map will start at sector -> %lu\n",
mirror_map_beginning);
}
if (
Drive_IO(WRITE, ((number_of_logical_sectors_on_drive-1) - offset_from_end),
-1) != 0) /* -1 correct??? */
{
printf(catgets(catalog, 23, 21, "Mirror map pointer write error - UNFORMAT will fail for you!\n"));
printf(catgets(catalog, 23, 22, "Skipping UNFORMAT / mirror data backup step.\n"));
Clear_Sector_Buffer(); /* just to be sure... */
return; /* abort this SAVEFS attempt. Continue with CREATEFS. - 0.91n */
}
/* Create the mirror map and copy the file system to the mirror. */
Clear_Sector_Buffer();
memset(mirror_map, 0, sizeof(mirror_map)); /* Clear mirror_map buffer */
mirror_map_sector = mirror_map_beginning; /* first sector to be used */
memcpy((void *)&mirror_map[0], "X:\\MIRROR.FIL",13);
mirror_map[0] &= 0xffffff00UL; /* remove the "X" */
mirror_map[0] |= param.drive_letter[0]; /* add the real drive letter */
/* Main mirror map creation and copying loop follows: */
pointer = 84/4;
number_of_bytes_in_mirror_map = 84;
source_sector = 0;
destination_sector = mirror_beginning;
end_of_root_directory_flag = FALSE;
do
{
if ( (source_sector>=reserved_sectors) /* "> 0" before 0.91p */ &&
(source_sector<beginning_of_fat) )
source_sector = beginning_of_fat;
/* skip first FAT if 2 FATs present, skip additional res. sectors */
if (debug_prog==TRUE)
{
if (source_sector <= beginning_of_fat) /* 0.91d */
{
if (source_sector < beginning_of_fat) /* (some) BOOT sector */
{
if (source_sector == 0) /* better messages (0.91p) */
{
printf("[DEBUG] Mirroring BOOT sector %lu at sector %lu%s\n",
source_sector, destination_sector,
(reserved_sectors > 1) ? " (etc.)" : "");
}
if ( (reserved_sectors > 1) &&
(source_sector == reserved_sectors-1) ) /* new 0.91p */
printf("[DEBUG] Mirroring last RESERVED sector %lu at sector %lu\n",
source_sector, destination_sector);
/* could change this and suppress multiple messages in FAT32 */
}
else /* beginning of (last) FAT */
{
printf("[DEBUG] Mirroring FAT %lu sector %lu at sector %lu, ...\n",
number_of_fats, source_sector, destination_sector);
}
}
else /* after FATs */
{
if (source_sector == beginning_of_root_directory)
{
printf("done.\n");
printf("[DEBUG] Mirroring ROOT DIR sector %lu at sector %lu, ",
source_sector, destination_sector);
}
else
{
/* 0.91l - less verbose. Even too unverbose now? */
if (source_sector == (beginning_of_root_directory-1))
printf("[DEBUG] ... mirroring last FAT sector %lu at %lu, ",
source_sector, destination_sector);
}
}
} /* debug_prog */
chunksize = 0; /* chunking loop added 0.91o for multi sector I/O */
do {
unsigned long perc_new = 100UL *
(source_sector + chunksize - beginning_of_fat) /
(beginning_of_root_directory - beginning_of_fat);
/* Enter mapping information into mirror map buffer */
mirror_map[pointer] = source_sector + chunksize;
pointer++;
MMapCheckWrite;
mirror_map[pointer] = destination_sector + chunksize;
pointer++;
MMapCheckWrite;
chunksize++;
if ((source_sector+chunksize) > end_of_root_directory)
end_of_root_directory_flag = TRUE;
/* changed >= into > in 0.91d (save ALL root dir sectors) */
if ( (source_sector >= beginning_of_fat) &&
(perc_new != percentage) &&
(perc_new <= 100) /* do not count root dir progress */ )
{
percentage = perc_new;
Display_Percentage_Formatted(percentage);
} /* percentage display added 0.91o */
} while ( (chunksize < (sizeof(huge_sector_buffer_0) >> 9)) &&
(source_sector >= beginning_of_fat) &&
(end_of_root_directory_flag != TRUE) );
/* chunking loop: only use multi sector I/O in FAT and root dir, */
/* which are assumed to be consecutive - not for boot sector! */
/* printf("%lu-[%lu]->%lu ", source_sector, chunksize, destination_sector); */
/* Copy mirror image one sector at a time */
if (Drive_IO(READ, source_sector, -(int)chunksize) != 0)
printf(catgets(catalog, 23, 23, "Read error at sector %lu - UNFORMAT data damaged\n"),
source_sector);
if (Drive_IO(WRITE, destination_sector, -(int)chunksize) != 0)
printf(catgets(catalog, 23, 24, "Write error at sector %lu - UNFORMAT data damaged\n"),
destination_sector);
source_sector += chunksize;
destination_sector += chunksize;
number_of_bytes_in_mirror_map += (chunksize << 3); /* chunksize * 8 */
} while (end_of_root_directory_flag==FALSE);
/* End of main mirror map creation and copying loop! */
/* if (debug_prog==TRUE) printf("done.\n"); */
if (percentage != 100) Display_Percentage_Formatted(100);
/* Write trailer in mirror map */
mirror_map[pointer] = 0;
pointer = 512/4; /* force writing */
MMapCheckWrite;
number_of_bytes_in_mirror_map += 4; /* add trailer - 0.91d */
printf(catgets(catalog, 23, 25, " Mirror map is %lu bytes long, "), number_of_bytes_in_mirror_map);
printf(catgets(catalog, 23, 26, " %lu sectors mirrored.\n"), (number_of_bytes_in_mirror_map - 88) / 8);
return;
}
/* copy back MIRROR data, overwriting both(!) FATs, boot sector and root dir */
/* TODO: Optimize this to pool access when sectors n ... n+m are all copied */
/* to sectors x ... x+m: Just doing one read and one write of m sectors */
/* size saves a lot of disk seek time. The limit for m is the buffer size. */
void Restore_File_System(void)
{
/* FAT32 FIXME: if used root directory data is longer than 1 cluster, */
/* not all of it will be mirrored, and the restored cluster chain will */
/* probably point to some old data for the remaining clusters. */
unsigned long mirror_map_sector;
unsigned long mirror_map[512/4]; /* 0.91k: only 1 sector for ANY FAT type */
int pointer = 0; /* pointer into mirror_map */
unsigned long number_of_logical_sectors_on_drive;
unsigned long beginning_of_fat = 0;
unsigned long sectors_per_fat = 0;
unsigned char number_of_fats = 0; /* unsigned CHAR this time! */
/* default (x)BPB already read using Set_Hard_Drive_Media_Parameters() */
if (parameter_block.bpb.total_sectors)
{
number_of_logical_sectors_on_drive = parameter_block.bpb.total_sectors;
}
else
{
number_of_logical_sectors_on_drive = parameter_block.bpb.large_sector_count_high;
number_of_logical_sectors_on_drive <<= 16;
number_of_logical_sectors_on_drive |= parameter_block.bpb.large_sector_count_low;
}
#ifndef BSWord
#define BSWord(ofs) ( (unsigned int *)(§or_buffer[ofs]) )[0]
#define BSLong(ofs) ( (unsigned long *)(§or_buffer[ofs]) )[0]
#endif
Drive_IO(READ, (number_of_logical_sectors_on_drive-1) -
( (param.drive_type == HARD) ? 20 : 5 ), 1);
if (strncmp((void *)§or_buffer[4], "AMSESLIFVASRORIMESAEP", 21))
{
printf(catgets(catalog, 23, 27, "No MIRROR / UNDELETE data: Wrong magic.\n"));
return;
}
mirror_map_sector = BSLong(0); /* read sector number of mirror map */
pointer = 84/4; /* start reading after headers! */
Drive_IO(READ, mirror_map_sector, 1);
memcpy((void *)&mirror_map[0], (void *)§or_buffer[0], 512);
sector_buffer[13] = 0; /* force string termination */
if (debug_prog==TRUE) printf("[DEBUG] Mirror map at sector %lu: '%s'\n",
mirror_map_sector, (char *)§or_buffer[0]);
/* mirror map should start with string "x:\mirror.fil" */
if (debug_prog==TRUE) printf("[DEBUG] First mirrored sector is %lu stored at %lu\n",
mirror_map[pointer], mirror_map[pointer+1]);
while (1)
{
unsigned long backup_sector;
unsigned long original_sector;
original_sector = mirror_map[pointer];
pointer++;
if (pointer == (512/4)) /* if beyond sector size */
{
mirror_map_sector++; /* fetch next mirror map sector */
if (debug_prog==TRUE)
printf("\n[DEBUG] Processing mirror map sector %lu.\n",
mirror_map_sector);
else
printf("*");
Drive_IO(READ, mirror_map_sector, 1);
memcpy((void *)&mirror_map[0], (void *)§or_buffer[0], 512);
pointer -= (512/4); /* pointer will be 0 now */
}
backup_sector = mirror_map[pointer];
pointer++;
/* printf("%lu->%lu ", backup_sector, original_sector); */
if ((number_of_fats > 0) &&
( (original_sector == 0UL) || (backup_sector == 0UL) ))
{
printf(catgets(catalog, 23, 28, "\n End of mirror map. UNFORMAT done.\n"));
if (param.fat_type == FAT32)
{
Drive_IO(READ, 0, 1);
backup_sector = BSWord(0x32);
if (backup_sector && (backup_sector < beginning_of_fat))
{
printf(catgets(catalog, 23, 29, " Cloning boot sector into backup.\n"));
if (Drive_IO(WRITE, backup_sector, -1)) printf(catgets(catalog, 1, 6, "Failed.\n"));
}
else
backup_sector = 0; /* no backups */
original_sector = BSWord(0x30);
if (original_sector && (original_sector < beginning_of_fat)
&& ((original_sector+backup_sector) < beginning_of_fat) )
{
printf(catgets(catalog, 23, 30, " Invalidating filesystem info sector data.\n"));
Drive_IO(READ, original_sector, 1);
memset((void *)§or_buffer[488], 0xff, 8);
/* set free_count and next_free long int values to -1 */
/* the OS will then re-initialize them on next reboot */
if (Drive_IO(WRITE, original_sector, -1)) printf(catgets(catalog, 1, 6, "Failed.\n"));
if (Drive_IO(WRITE, original_sector+backup_sector, -1))
printf(catgets(catalog, 1, 6, "Failed.\n"));
}
} /* FAT32 postprocessing */
return;
}
if (Drive_IO(READ, backup_sector, -1))
{
printf(catgets(catalog, 23, 31, "*** Could not copy backup sector %lu to sector %lu ***\n"),
backup_sector, original_sector);
}
else
{
if ( (original_sector == 0) &&
( (sector_buffer[0x10] > 7) || (sector_buffer[0x10] < 1) ) )
{
printf(catgets(catalog, 23, 32, "Boot sector would be overwritten by nonsense, 0 or > 7 FATs.\n"));
printf(catgets(catalog, 1, 7, "Aborting.\n"));
Exit(4,39); /* restore filesystem aborted: boot sector odd */
} /* nonsense boot protection */
if (Drive_IO(WRITE, original_sector, -1))
printf(catgets(catalog, 23, 33, "*** Could not restore sector %lu ***\n"), original_sector);
if (debug_prog==TRUE) printf(".");
if ( (number_of_fats > 1) && /* recreate 2nd FAT copy if needed */
(original_sector >= beginning_of_fat) &&
( (original_sector-beginning_of_fat) < (2*sectors_per_fat) ) )
{
unsigned long cloned_sector = original_sector;
if (original_sector >= (beginning_of_fat+sectors_per_fat))
{
cloned_sector -= sectors_per_fat; /* clone 2nd into 1st */
if (debug_prog==TRUE) printf("<");
}
else
{
cloned_sector += sectors_per_fat; /* clone 1st into 2nd */
if (debug_prog==TRUE) printf(">");
}
if (Drive_IO(WRITE, cloned_sector, -1))
printf(catgets(catalog, 23, 34, "*** Could not clone FAT sector %lu into sector %lu ***\n"),
original_sector, cloned_sector);
} /* FAT cloning */
if (original_sector == 0UL)
{
number_of_fats = sector_buffer[0x10]; /* should be or 1 2 */
if ( /* (number_of_fats < 0) || */ (number_of_fats > 2))
{
if (!number_of_fats) number_of_fats++;
if (number_of_fats > 2) number_of_fats = 2;
printf(catgets(catalog, 23, 35, "WARNING: %hu FAT copies requested, using %hu instead.\n"),
sector_buffer[0x10], number_of_fats);
}
beginning_of_fat = BSWord(0x0e); /* FAT begins after reserved sectors */
sectors_per_fat = BSWord(0x16); /* FAT16 style */
if (!sectors_per_fat)
{
sectors_per_fat = BSLong(0x24); /* FAT32 style */
if (param.fat_type != FAT32)
printf(catgets(catalog, 23, 36, "WARNING: UNFORMAT turns FAT1x drive into FAT32.\n"));
/* according to recorded boot sector */
param.fat_type = FAT32; /* 0 FAT1x size: FAT32 I/O style needed in Restore_File_System */
}
else
{
if (param.fat_type == FAT32)
printf(catgets(catalog, 23, 37, "WARNING: UNFORMAT turns FAT32 drive into FAT1x!?\n"));
}
#if 0 /* delay recheck because of locking - 0.91q */
// Force_Drive_Recheck(); /* if we have just written the boot sector */
#endif
printf(catgets(catalog, 23, 38, "\n Boot sector data: %hu FAT copies (offset %lu), %lu sectors per FAT\n"),
number_of_fats, beginning_of_fat, sectors_per_fat);
} /* boot sector updated */
} /* READ worked */
} /* while */
/* return; */ /* never reached */
}