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fsck.cramfs: coding style 

Lots of braces got to be removed, which can cause something to
break even everything is double checked.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
This commit is contained in:
Sami Kerola 2011-07-20 22:08:48 +02:00
parent fc8dc41054
commit 6ffd9b03f2
1 changed files with 179 additions and 218 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

397
disk-utils/fsck.cramfs.c
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@ -79,7 +79,7 @@ struct cramfs_super super; /* just find the cramfs superblock once */
static int cramfs_is_big_endian = 0; /* source is big endian */
static int opt_verbose = 0; /* 1 = verbose (-v), 2+ = very verbose (-vv) */
char *extract_dir = ""; /* extraction directory (-x) */
char *extract_dir = ""; /* extraction directory (-x) */
#define PAD_SIZE 512
@ -87,19 +87,19 @@ char *extract_dir = ""; /* extraction directory (-x) */
static int opt_extract = 0; /* extract cramfs (-x) */
static uid_t euid; /* effective UID */
static uid_t euid; /* effective UID */
/* (cramfs_super + start) <= start_dir < end_dir <= start_data <= end_data */
static unsigned long start_dir = ~0UL; /* start of first non-root inode */
static unsigned long end_dir = 0; /* end of the directory structure */
static unsigned long start_data = ~0UL; /* start of the data (256 MB = max) */
static unsigned long end_data = 0; /* end of the data */
static unsigned long start_dir = ~0UL; /* start of first non-root inode */
static unsigned long end_dir = 0; /* end of the directory structure */
static unsigned long start_data = ~0UL; /* start of the data (256 MB = max) */
static unsigned long end_data = 0; /* end of the data */
/* Guarantee access to at least 8kB at a time */
#define ROMBUFFER_BITS 13
#define ROMBUFFERSIZE (1 << ROMBUFFER_BITS)
#define ROMBUFFERMASK (ROMBUFFERSIZE-1)
#define ROMBUFFERMASK (ROMBUFFERSIZE - 1)
static char read_buffer[ROMBUFFERSIZE * 2];
static unsigned long read_buffer_block = ~0UL;
@ -132,93 +132,79 @@ int get_superblock_endianness(uint32_t magic)
if (magic == CRAMFS_MAGIC) {
cramfs_is_big_endian = HOST_IS_BIG_ENDIAN;
return 0;
}
else if (magic == u32_toggle_endianness(!HOST_IS_BIG_ENDIAN, CRAMFS_MAGIC)) {
} else if (magic ==
u32_toggle_endianness(!HOST_IS_BIG_ENDIAN, CRAMFS_MAGIC)) {
cramfs_is_big_endian = !HOST_IS_BIG_ENDIAN;
return 0;
}
else {
} else
return -1;
}
}
static void test_super(int *start, size_t *length) {
static void test_super(int *start, size_t * length)
{
struct stat st;
/* find the physical size of the file or block device */
if (stat(filename, &st) < 0) {
if (stat(filename, &st) < 0)
err(FSCK_ERROR, _("stat failed: %s"), filename);
}
fd = open(filename, O_RDONLY);
if (fd < 0) {
if (fd < 0)
err(FSCK_ERROR, _("open failed: %s"), filename);
}
if (S_ISBLK(st.st_mode)) {
unsigned long long bytes;
if (blkdev_get_size(fd, &bytes)) {
err(FSCK_ERROR, _("ioctl failed: unable to determine device size: %s"), filename);
}
if (blkdev_get_size(fd, &bytes))
err(FSCK_ERROR,
_("ioctl failed: unable to determine device size: %s"),
filename);
*length = bytes;
}
else if (S_ISREG(st.st_mode)) {
} else if (S_ISREG(st.st_mode))
*length = st.st_size;
}
else {
else
errx(FSCK_ERROR, _("not a block device or file: %s"), filename);
}
if (*length < sizeof(struct cramfs_super)) {
if (*length < sizeof(struct cramfs_super))
errx(FSCK_UNCORRECTED, _("file length too short"));
}
/* find superblock */
if (read(fd, &super, sizeof(super)) != sizeof(super)) {
if (read(fd, &super, sizeof(super)) != sizeof(super))
err(FSCK_ERROR, _("read failed: %s"), filename);
}
if (get_superblock_endianness(super.magic) != -1) {
if (get_superblock_endianness(super.magic) != -1)
*start = 0;
}
else if (*length >= (PAD_SIZE + sizeof(super))) {
lseek(fd, PAD_SIZE, SEEK_SET);
if (read(fd, &super, sizeof(super)) != sizeof(super)) {
if (read(fd, &super, sizeof(super)) != sizeof(super))
err(FSCK_ERROR, _("read failed: %s"), filename);
}
if (get_superblock_endianness(super.magic) != -1) {
if (get_superblock_endianness(super.magic) != -1)
*start = PAD_SIZE;
}
else {
else
errx(FSCK_UNCORRECTED, "superblock magic not found");
}
}
else {
} else
errx(FSCK_UNCORRECTED, _("superblock magic not found"));
}
if (opt_verbose) {
printf("cramfs endianness is %s\n", cramfs_is_big_endian ? "big" : "little");
}
if (opt_verbose)
printf("cramfs endianness is %s\n",
cramfs_is_big_endian ? "big" : "little");
super_toggle_endianness(cramfs_is_big_endian, &super);
if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) {
if (super.flags & ~CRAMFS_SUPPORTED_FLAGS)
errx(FSCK_ERROR, _("unsupported filesystem features"));
}
if (super.size < page_size) {
errx(FSCK_UNCORRECTED, _("superblock size (%d) too small"), super.size);
}
if (super.size < page_size)
errx(FSCK_UNCORRECTED, _("superblock size (%d) too small"),
super.size);
if (super.flags & CRAMFS_FLAG_FSID_VERSION_2) {
if (super.fsid.files == 0) {
if (super.fsid.files == 0)
errx(FSCK_UNCORRECTED, _("zero file count"));
}
if (*length < super.size) {
if (*length < super.size)
errx(FSCK_UNCORRECTED, _("file length too short"));
}
else if (*length > super.size) {
fprintf(stderr, _("warning: file extends past end of filesystem\n"));
}
}
else {
else if (*length > super.size)
fprintf(stderr,
_("warning: file extends past end of filesystem\n"));
} else
fprintf(stderr, _("warning: old cramfs format\n"));
}
}
static void test_crc(int start)
@ -229,16 +215,19 @@ static void test_crc(int start)
if (!(super.flags & CRAMFS_FLAG_FSID_VERSION_2)) {
#ifdef INCLUDE_FS_TESTS
return;
#else /* not INCLUDE_FS_TESTS */
#else
errx(FSCK_USAGE, _("unable to test CRC: old cramfs format"));
#endif /* not INCLUDE_FS_TESTS */
#endif
}
crc = crc32(0L, Z_NULL, 0);
buf = mmap(NULL, super.size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
buf =
mmap(NULL, super.size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
if (buf == MAP_FAILED) {
buf = mmap(NULL, super.size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
buf =
mmap(NULL, super.size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (buf != MAP_FAILED) {
lseek(fd, 0, SEEK_SET);
if (read(fd, buf, super.size) < 0)
@ -246,11 +235,11 @@ static void test_crc(int start)
}
}
if (buf != MAP_FAILED) {
((struct cramfs_super *) (buf+start))->fsid.crc = crc32(0L, Z_NULL, 0);
crc = crc32(crc, buf+start, super.size-start);
((struct cramfs_super *)(buf + start))->fsid.crc =
crc32(0L, Z_NULL, 0);
crc = crc32(crc, buf + start, super.size - start);
munmap(buf, super.size);
}
else {
} else {
int retval;
size_t length = 0;
@ -258,18 +247,18 @@ static void test_crc(int start)
lseek(fd, start, SEEK_SET);
for (;;) {
retval = read(fd, buf, 4096);
if (retval < 0) {
if (retval < 0)
err(FSCK_ERROR, _("read failed: %s"), filename);
}
else if (retval == 0) {
else if (retval == 0)
break;
}
if (length == 0) {
((struct cramfs_super *) buf)->fsid.crc = crc32(0L, Z_NULL, 0);
}
if (length == 0)
((struct cramfs_super *)buf)->fsid.crc =
crc32(0L, Z_NULL, 0);
length += retval;
if (length > (super.size-start)) {
crc = crc32(crc, buf, retval - (length - (super.size-start)));
if (length > (super.size - start)) {
crc = crc32(crc, buf,
retval - (length -
(super.size - start)));
break;
}
crc = crc32(crc, buf, retval);
@ -277,9 +266,8 @@ static void test_crc(int start)
free(buf);
}
if (crc != super.fsid.crc) {
if (crc != super.fsid.crc)
errx(FSCK_UNCORRECTED, _("crc error"));
}
}
#ifdef INCLUDE_FS_TESTS
@ -287,14 +275,12 @@ static void print_node(char type, struct cramfs_inode *i, char *name)
{
char info[10];
if (S_ISCHR(i->mode) || (S_ISBLK(i->mode))) {
if (S_ISCHR(i->mode) || (S_ISBLK(i->mode)))
/* major/minor numbers can be as high as 2^12 or 4096 */
snprintf(info, 10, "%4d,%4d", major(i->size), minor(i->size));
}
else {
else
/* size be as high as 2^24 or 16777216 */
snprintf(info, 10, "%9d", i->size);
}
printf("%c %04o %s %5d:%-3d %s\n",
type, i->mode & ~S_IFMT, info, i->uid, i->gid,
@ -315,7 +301,7 @@ static void *romfs_read(unsigned long offset)
return read_buffer + (offset & ROMBUFFERMASK);
}
static struct cramfs_inode *cramfs_iget(struct cramfs_inode * i)
static struct cramfs_inode *cramfs_iget(struct cramfs_inode *i)
{
struct cramfs_inode *inode = xmalloc(sizeof(struct cramfs_inode));
@ -338,15 +324,14 @@ static void iput(struct cramfs_inode *inode)
*/
static struct cramfs_inode *read_super(void)
{
struct cramfs_inode * root = cramfs_iget(&super.root);
struct cramfs_inode *root = cramfs_iget(&super.root);
unsigned long offset = root->offset << 2;
if (!S_ISDIR(root->mode))
errx(FSCK_UNCORRECTED, _("root inode is not directory"));
if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
((offset != sizeof(struct cramfs_super)) &&
(offset != PAD_SIZE + sizeof(struct cramfs_super))))
{
(offset != PAD_SIZE + sizeof(struct cramfs_super)))) {
errx(FSCK_UNCORRECTED, _("bad root offset (%lu)"), offset);
}
return root;
@ -359,67 +344,68 @@ static int uncompress_block(void *src, int len)
stream.next_in = src;
stream.avail_in = len;
stream.next_out = (unsigned char *) outbuffer;
stream.avail_out = page_size*2;
stream.next_out = (unsigned char *)outbuffer;
stream.avail_out = page_size * 2;
inflateReset(&stream);
if (len > page_size*2) {
if (len > page_size * 2)
errx(FSCK_UNCORRECTED, _("data block too large"));
}
err = inflate(&stream, Z_FINISH);
if (err != Z_STREAM_END) {
if (err != Z_STREAM_END)
errx(FSCK_UNCORRECTED, _("decompression error %p(%d): %s"),
zError(err), src, len);
}
zError(err), src, len);
return stream.total_out;
}
#if !HAVE_LCHOWN
#define lchown chown
#endif
static void do_uncompress(char *path, int fd, unsigned long offset, unsigned long size)
static void do_uncompress(char *path, int fd, unsigned long offset,
unsigned long size)
{
unsigned long curr = offset + 4 * ((size + page_size - 1) / page_size);
do {
unsigned long out = page_size;
unsigned long next = u32_toggle_endianness(cramfs_is_big_endian, *(uint32_t *) romfs_read(offset));
unsigned long next = u32_toggle_endianness(cramfs_is_big_endian,
*(uint32_t *)
romfs_read(offset));
if (next > end_data) {
if (next > end_data)
end_data = next;
}
offset += 4;
if (curr == next) {
if (opt_verbose > 1) {
printf(_(" hole at %ld (%zd)\n"), curr, page_size);
}
if (opt_verbose > 1)
printf(_(" hole at %ld (%zd)\n"), curr,
page_size);
if (size < page_size)
out = size;
memset(outbuffer, 0x00, out);
}
else {
if (opt_verbose > 1) {
printf(_(" uncompressing block at %ld to %ld (%ld)\n"), curr, next, next - curr);
}
} else {
if (opt_verbose > 1)
printf(_(" uncompressing block at %ld to %ld (%ld)\n"),
curr, next, next - curr);
out = uncompress_block(romfs_read(curr), next - curr);
}
if (size >= page_size) {
if (out != page_size) {
errx(FSCK_UNCORRECTED, _("non-block (%ld) bytes"), out);
}
if (out != page_size)
errx(FSCK_UNCORRECTED,
_("non-block (%ld) bytes"), out);
} else {
if (out != size) {
errx(FSCK_UNCORRECTED, _("non-size (%ld vs %ld) bytes"), out, size);
}
if (out != size)
errx(FSCK_UNCORRECTED,
_("non-size (%ld vs %ld) bytes"), out,
size);
}
size -= out;
if (opt_extract) {
if (write(fd, outbuffer, out) < 0) {
err(FSCK_ERROR, _("write failed: %s"), path);
}
}
if (opt_extract)
if (write(fd, outbuffer, out) < 0)
err(FSCK_ERROR, _("write failed: %s"),
path);
curr = next;
} while (size);
}
@ -429,22 +415,17 @@ static void change_file_status(char *path, struct cramfs_inode *i)
struct utimbuf epoch = { 0, 0 };
if (euid == 0) {
if (lchown(path, i->uid, i->gid) < 0) {
if (lchown(path, i->uid, i->gid) < 0)
err(FSCK_ERROR, _("lchown failed: %s"), path);
}
if (S_ISLNK(i->mode))
return;
if ((S_ISUID | S_ISGID) & i->mode) {
if (chmod(path, i->mode) < 0) {
err(FSCK_ERROR, _("chown failed: %s"), path);
}
}
if (((S_ISUID | S_ISGID) & i->mode) && chmod(path, i->mode) < 0)
err(FSCK_ERROR, _("chown failed: %s"), path);
}
if (S_ISLNK(i->mode))
return;
if (utime(path, &epoch) < 0) {
if (utime(path, &epoch) < 0)
err(FSCK_ERROR, _("utime failed: %s"), path);
}
}
static void do_directory(char *path, struct cramfs_inode *i)
@ -454,23 +435,24 @@ static void do_directory(char *path, struct cramfs_inode *i)
unsigned long offset = i->offset << 2;
char *newpath = xmalloc(pathlen + 256);
if (offset == 0 && count != 0) {
errx(FSCK_UNCORRECTED, _("directory inode has zero offset and non-zero size: %s"), path);
}
if (offset != 0 && offset < start_dir) {
if (offset == 0 && count != 0)
errx(FSCK_UNCORRECTED,
_("directory inode has zero offset and non-zero size: %s"),
path);
if (offset != 0 && offset < start_dir)
start_dir = offset;
}
/* TODO: Do we need to check end_dir for empty case? */
memcpy(newpath, path, pathlen);
newpath[pathlen] = '/';
pathlen++;
if (opt_verbose) {
if (opt_verbose)
print_node('d', i, path);
}
if (opt_extract) {
if (mkdir(path, i->mode) < 0) {
if (mkdir(path, i->mode) < 0)
err(FSCK_ERROR, _("mkdir failed: %s"), path);
}
change_file_status(path, i);
}
while (count > 0) {
@ -485,23 +467,19 @@ static void do_directory(char *path, struct cramfs_inode *i)
memcpy(newpath + pathlen, romfs_read(offset), newlen);
newpath[pathlen + newlen] = 0;
if (newlen == 0) {
if (newlen == 0)
errx(FSCK_UNCORRECTED, _("filename length is zero"));
}
if ((pathlen + newlen) - strlen(newpath) > 3) {
if ((pathlen + newlen) - strlen(newpath) > 3)
errx(FSCK_UNCORRECTED, _("bad filename length"));
}
expand_fs(newpath, child);
offset += newlen;
if (offset <= start_dir) {
if (offset <= start_dir)
errx(FSCK_UNCORRECTED, _("bad inode offset"));
}
if (offset > end_dir) {
if (offset > end_dir)
end_dir = offset;
}
iput(child); /* free(child) */
iput(child); /* free(child) */
}
free(newpath);
}
@ -511,27 +489,23 @@ static void do_file(char *path, struct cramfs_inode *i)
unsigned long offset = i->offset << 2;
int fd = 0;
if (offset == 0 && i->size != 0) {
errx(FSCK_UNCORRECTED, _("file inode has zero offset and non-zero size"));
}
if (i->size == 0 && offset != 0) {
errx(FSCK_UNCORRECTED, _("file inode has zero size and non-zero offset"));
}
if (offset != 0 && offset < start_data) {
if (offset == 0 && i->size != 0)
errx(FSCK_UNCORRECTED,
_("file inode has zero offset and non-zero size"));
if (i->size == 0 && offset != 0)
errx(FSCK_UNCORRECTED,
_("file inode has zero size and non-zero offset"));
if (offset != 0 && offset < start_data)
start_data = offset;
}
if (opt_verbose) {
if (opt_verbose)
print_node('f', i, path);
}
if (opt_extract) {
fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, i->mode);
if (fd < 0) {
if (fd < 0)
err(FSCK_ERROR, _("open failed: %s"), path);
}
}
if (i->size) {
if (i->size)
do_uncompress(path, fd, offset, i->size);
}
if (opt_extract) {
close(fd);
change_file_status(path, i);
@ -542,42 +516,38 @@ static void do_symlink(char *path, struct cramfs_inode *i)
{
unsigned long offset = i->offset << 2;
unsigned long curr = offset + 4;
unsigned long next = u32_toggle_endianness(cramfs_is_big_endian, *(uint32_t *) romfs_read(offset));
unsigned long next =
u32_toggle_endianness(cramfs_is_big_endian,
*(uint32_t *) romfs_read(offset));
unsigned long size;
if (offset == 0) {
if (offset == 0)
errx(FSCK_UNCORRECTED, _("symbolic link has zero offset"));
}
if (i->size == 0) {
if (i->size == 0)
errx(FSCK_UNCORRECTED, _("symbolic link has zero size"));
}
if (offset < start_data) {
if (offset < start_data)
start_data = offset;
}
if (next > end_data) {
if (next > end_data)
end_data = next;
}
size = uncompress_block(romfs_read(curr), next - curr);
if (size != i->size) {
if (size != i->size)
errx(FSCK_UNCORRECTED, _("size error in symlink: %s"), path);
}
outbuffer[size] = 0;
if (opt_verbose) {
char *str;
asprintf(&str, "%s -> %s", path, outbuffer);
print_node('l', i, str);
if (opt_verbose > 1) {
printf(_(" uncompressing block at %ld to %ld (%ld)\n"), curr, next, next - curr);
}
if (opt_verbose > 1)
printf(_(" uncompressing block at %ld to %ld (%ld)\n"),
curr, next, next - curr);
free(str);
}
if (opt_extract) {
if (symlink(outbuffer, path) < 0) {
if (symlink(outbuffer, path) < 0)
err(FSCK_ERROR, _("symlink failed: %s"), path);
}
change_file_status(path, i);
}
}
@ -587,60 +557,52 @@ static void do_special_inode(char *path, struct cramfs_inode *i)
dev_t devtype = 0;
char type;
if (i->offset) { /* no need to shift offset */
errx(FSCK_UNCORRECTED, _("special file has non-zero offset: %s"), path);
}
if (i->offset)
/* no need to shift offset */
errx(FSCK_UNCORRECTED,
_("special file has non-zero offset: %s"), path);
if (S_ISCHR(i->mode)) {
devtype = i->size;
type = 'c';
}
else if (S_ISBLK(i->mode)) {
} else if (S_ISBLK(i->mode)) {
devtype = i->size;
type = 'b';
}
else if (S_ISFIFO(i->mode)) {
if (i->size != 0) {
errx(FSCK_UNCORRECTED, _("fifo has non-zero size: %s"), path);
}
} else if (S_ISFIFO(i->mode)) {
if (i->size != 0)
errx(FSCK_UNCORRECTED, _("fifo has non-zero size: %s"),
path);
type = 'p';
}
else if (S_ISSOCK(i->mode)) {
if (i->size != 0) {
errx(FSCK_UNCORRECTED, _("socket has non-zero size: %s"), path);
}
} else if (S_ISSOCK(i->mode)) {
if (i->size != 0)
errx(FSCK_UNCORRECTED,
_("socket has non-zero size: %s"), path);
type = 's';
}
else {
} else {
errx(FSCK_UNCORRECTED, _("bogus mode: %s (%o)"), path, i->mode);
return; /* not reached */
}
if (opt_verbose) {
if (opt_verbose)
print_node(type, i, path);
}
if (opt_extract) {
if (mknod(path, i->mode, devtype) < 0) {
if (mknod(path, i->mode, devtype) < 0)
err(FSCK_ERROR, _("mknod failed: %s"), path);
}
change_file_status(path, i);
}
}
static void expand_fs(char *path, struct cramfs_inode *inode)
{
if (S_ISDIR(inode->mode)) {
if (S_ISDIR(inode->mode))
do_directory(path, inode);
}
else if (S_ISREG(inode->mode)) {
else if (S_ISREG(inode->mode))
do_file(path, inode);
}
else if (S_ISLNK(inode->mode)) {
else if (S_ISLNK(inode->mode))
do_symlink(path, inode);
}
else {
else
do_special_inode(path, inode);
}
}
static void test_fs(int start)
@ -656,18 +618,19 @@ static void test_fs(int start)
expand_fs(extract_dir, root);
inflateEnd(&stream);
if (start_data != ~0UL) {
if (start_data < (sizeof(struct cramfs_super) + start)) {
errx(FSCK_UNCORRECTED, _("directory data start (%ld) < sizeof(struct cramfs_super) + start (%ld)"), start_data, sizeof(struct cramfs_super) + start);
}
if (end_dir != start_data) {
errx(FSCK_UNCORRECTED, _("directory data end (%ld) != file data start (%ld)"), end_dir, start_data);
}
if (start_data < (sizeof(struct cramfs_super) + start))
errx(FSCK_UNCORRECTED,
_("directory data start (%ld) < sizeof(struct cramfs_super) + start (%ld)"),
start_data, sizeof(struct cramfs_super) + start);
if (end_dir != start_data)
errx(FSCK_UNCORRECTED,
_("directory data end (%ld) != file data start (%ld)"),
end_dir, start_data);
}
if (super.flags & CRAMFS_FLAG_FSID_VERSION_2) {
if (end_data > super.size) {
if (super.flags & CRAMFS_FLAG_FSID_VERSION_2)
if (end_data > super.size)
errx(FSCK_UNCORRECTED, _("invalid file data offset"));
}
}
iput(root); /* free(root) */
}
#endif /* INCLUDE_FS_TESTS */
@ -690,7 +653,7 @@ int main(int argc, char **argv)
outbuffer = xmalloc(page_size * 2);
/* command line options */
while ((c = getopt(argc, argv, "hx:v")) != EOF) {
while ((c = getopt(argc, argv, "hx:v")) != EOF)
switch (c) {
case 'h':
usage(FSCK_OK);
@ -699,14 +662,13 @@ int main(int argc, char **argv)
opt_extract = 1;
extract_dir = optarg;
break;
#else /* not INCLUDE_FS_TESTS */
#else
errx(FSCK_USAGE, _("compiled without -x support"));
#endif /* not INCLUDE_FS_TESTS */
#endif
case 'v':
opt_verbose++;
break;
}
}
if ((argc - optind) != 1)
usage(FSCK_USAGE);
@ -716,11 +678,10 @@ int main(int argc, char **argv)
test_crc(start);
#ifdef INCLUDE_FS_TESTS
test_fs(start);
#endif /* INCLUDE_FS_TESTS */
#endif
if (opt_verbose) {
if (opt_verbose)
printf("%s: OK\n", filename);
}
exit(FSCK_OK);
}