Tried alternate boot sector if cannot start up in ntfsfix.c
Jean-Pierre André
parent
9f765effd3
commit
b0849af206
|
|
@ -68,6 +68,7 @@
|
|||
#include "types.h"
|
||||
#include "attrib.h"
|
||||
#include "volume.h"
|
||||
#include "bootsect.h"
|
||||
#include "mft.h"
|
||||
#include "device.h"
|
||||
#include "logfile.h"
|
||||
|
|
@ -448,12 +449,187 @@ error_exit:
|
|||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Rewrite the boot sector
|
||||
*
|
||||
* Returns 0 if successful
|
||||
*/
|
||||
|
||||
static int rewrite_boot(struct ntfs_device *dev, NTFS_BOOT_SECTOR *bs)
|
||||
{
|
||||
s64 bw;
|
||||
int res;
|
||||
|
||||
res = -1;
|
||||
ntfs_log_info("Rewriting the bootsector\n");
|
||||
bw = ntfs_pwrite(dev, 0, sizeof(NTFS_BOOT_SECTOR), bs);
|
||||
if (bw == sizeof(NTFS_BOOT_SECTOR))
|
||||
res = 0;
|
||||
else {
|
||||
if (bw != -1)
|
||||
errno = EINVAL;
|
||||
if (!bw)
|
||||
ntfs_log_error("Failed to rewrite the bootsector (size=0)\n");
|
||||
else
|
||||
ntfs_log_perror("Error rewriting the bootsector");
|
||||
}
|
||||
return (res);
|
||||
}
|
||||
|
||||
/*
|
||||
* Try the alternate boot sector if the normal one is bad
|
||||
*
|
||||
* if successful, rewrite the normal boot sector accordingly
|
||||
*
|
||||
* Returns 0 if successful
|
||||
*/
|
||||
|
||||
static int try_alternate_boot(struct ntfs_device *dev, NTFS_BOOT_SECTOR *bs)
|
||||
{
|
||||
s64 blocks;
|
||||
s64 br;
|
||||
int res;
|
||||
|
||||
res = -1;
|
||||
blocks = ntfs_device_size_get(dev,512);
|
||||
if (blocks > 0) {
|
||||
br = ntfs_pread(dev, (blocks - 1)*512,
|
||||
sizeof(NTFS_BOOT_SECTOR), bs);
|
||||
if (br != sizeof(NTFS_BOOT_SECTOR)) {
|
||||
if (br != -1)
|
||||
errno = EINVAL;
|
||||
if (!br)
|
||||
ntfs_log_error("Failed to read alternate bootsector (size=0)\n");
|
||||
else
|
||||
ntfs_log_perror("Error reading alternate bootsector");
|
||||
} else {
|
||||
if (!ntfs_boot_sector_is_ntfs(bs)) {
|
||||
ntfs_log_error("Both boot sectors are unusable\n");
|
||||
// provide information about NTFS signature
|
||||
} else {
|
||||
ntfs_log_info("The alternate bootsector is usable\n");
|
||||
/* fix the normal boot sector */
|
||||
if (!opt.no_action) {
|
||||
res = rewrite_boot(dev, bs);
|
||||
} else
|
||||
res = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
return (res);
|
||||
}
|
||||
|
||||
/*
|
||||
* Try to fix problems which may arise in the start up sequence
|
||||
*
|
||||
* This is a replay of the normal start up sequence with fixes when
|
||||
* some problem arise.
|
||||
*/
|
||||
|
||||
static int fix_startup(struct ntfs_device *dev, unsigned long flags)
|
||||
{
|
||||
s64 br;
|
||||
ntfs_volume *vol;
|
||||
BOOL dev_open;
|
||||
NTFS_BOOT_SECTOR *bs;
|
||||
int res;
|
||||
int eo;
|
||||
|
||||
errno = 0;
|
||||
res = -1;
|
||||
dev_open = FALSE;
|
||||
if (!dev || !dev->d_ops || !dev->d_name) {
|
||||
errno = EINVAL;
|
||||
ntfs_log_perror("%s: dev = %p", __FUNCTION__, dev);
|
||||
goto error_exit;
|
||||
}
|
||||
|
||||
bs = (NTFS_BOOT_SECTOR*)ntfs_malloc(sizeof(NTFS_BOOT_SECTOR));
|
||||
if (!bs)
|
||||
goto error_exit;
|
||||
|
||||
/* Allocate the volume structure. */
|
||||
vol = ntfs_volume_alloc();
|
||||
if (!vol)
|
||||
goto error_exit;
|
||||
|
||||
/* Create the default upcase table. */
|
||||
vol->upcase_len = ntfs_upcase_build_default(&vol->upcase);
|
||||
if (!vol->upcase_len || !vol->upcase)
|
||||
goto error_exit;
|
||||
|
||||
/* Default with no locase table and case sensitive file names */
|
||||
vol->locase = (ntfschar*)NULL;
|
||||
NVolSetCaseSensitive(vol);
|
||||
|
||||
/* by default, all files are shown and not marked hidden */
|
||||
NVolSetShowSysFiles(vol);
|
||||
NVolSetShowHidFiles(vol);
|
||||
NVolClearHideDotFiles(vol);
|
||||
if (flags & MS_RDONLY)
|
||||
NVolSetReadOnly(vol);
|
||||
|
||||
/* ...->open needs bracketing to compile with glibc 2.7 */
|
||||
if ((dev->d_ops->open)(dev, NVolReadOnly(vol) ? O_RDONLY: O_RDWR)) {
|
||||
ntfs_log_perror("Error opening '%s'", dev->d_name);
|
||||
goto error_exit;
|
||||
}
|
||||
dev_open = TRUE;
|
||||
/* Attach the device to the volume. */
|
||||
vol->dev = dev;
|
||||
|
||||
/* Now read the bootsector. */
|
||||
br = ntfs_pread(dev, 0, sizeof(NTFS_BOOT_SECTOR), bs);
|
||||
if (br != sizeof(NTFS_BOOT_SECTOR)) {
|
||||
if (br != -1)
|
||||
errno = EINVAL;
|
||||
if (!br)
|
||||
ntfs_log_error("Failed to read bootsector (size=0)\n");
|
||||
else
|
||||
ntfs_log_perror("Error reading bootsector");
|
||||
goto error_exit;
|
||||
}
|
||||
if (!ntfs_boot_sector_is_ntfs(bs)) {
|
||||
/* boot sector is wrong, try the alternate boot sector */
|
||||
if (try_alternate_boot(dev, bs)) {
|
||||
errno = EINVAL;
|
||||
goto error_exit;
|
||||
}
|
||||
}
|
||||
/* get the bootsector data, only fails when inconsistent */
|
||||
if (ntfs_boot_sector_parse(vol, bs) < 0)
|
||||
goto error_exit;
|
||||
res = 0;
|
||||
error_exit:
|
||||
if (res) {
|
||||
switch (errno) {
|
||||
case ENOMEM :
|
||||
ntfs_log_error("Failed to allocate memory\n");
|
||||
break;
|
||||
case EINVAL :
|
||||
ntfs_log_error("Unrecoverable error\n");
|
||||
break;
|
||||
default :
|
||||
break;
|
||||
}
|
||||
}
|
||||
eo = errno;
|
||||
free(bs);
|
||||
if (vol)
|
||||
free(vol);
|
||||
if (dev_open) {
|
||||
(dev->d_ops->close)(dev);
|
||||
}
|
||||
errno = eo;
|
||||
return (res);
|
||||
}
|
||||
|
||||
/**
|
||||
* fix_mount
|
||||
*/
|
||||
static int fix_mount(void)
|
||||
{
|
||||
int ret = -1; /* failure */
|
||||
int ret = 0; /* default success */
|
||||
ntfs_volume *vol;
|
||||
struct ntfs_device *dev;
|
||||
unsigned long flags;
|
||||
|
|
@ -472,12 +648,24 @@ static int fix_mount(void)
|
|||
if (!vol) {
|
||||
ntfs_log_info(FAILED);
|
||||
ntfs_log_perror("Failed to startup volume");
|
||||
ntfs_log_error("Volume is corrupt. You should run chkdsk.\n");
|
||||
ntfs_device_free(dev);
|
||||
return -1;
|
||||
|
||||
/* Try fixing the bootsector and redo the startup */
|
||||
if (!fix_startup(dev, flags)) {
|
||||
if (opt.no_action)
|
||||
ntfs_log_info("The bootsector can be fixed, "
|
||||
"but no change was requested\n");
|
||||
else
|
||||
vol = ntfs_volume_startup(dev, flags);
|
||||
}
|
||||
if (!vol) {
|
||||
ntfs_log_error("Volume is corrupt. You should run chkdsk.\n");
|
||||
ntfs_device_free(dev);
|
||||
return -1;
|
||||
}
|
||||
if (opt.no_action)
|
||||
ret = -1; /* error present and not fixed */
|
||||
}
|
||||
/* if option -n proceed despite errors, to display them all */
|
||||
ret = 0;
|
||||
if ((!ret || opt.no_action) && (fix_mftmirr(vol) < 0))
|
||||
ret = -1;
|
||||
if ((!ret || opt.no_action) && (set_dirty_flag(vol) < 0))
|
||||
|
|
|
|||
Loading…
Reference in New Issue