void check_plausibility(const char *device)
{
int val;
ext2fs_struct_stat s;
val = ext2fs_stat(device, &s);
if(val == -1) {
fprintf(stderr, _("Could not stat %s --- %s\n"),
device, error_message(errno));
if (errno == ENOENT)
fputs(_("\nThe device apparently does not exist; "
"did you specify it correctly?\n"), stderr);
exit(1);
}
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
/* On FreeBSD, all disk devices are character specials */
if (!S_ISBLK(s.st_mode) && !S_ISCHR(s.st_mode))
#else
if (!S_ISBLK(s.st_mode))
#endif
{
printf(_("%s is not a block special device.\n"), device);
proceed_question();
return;
}
#ifdef HAVE_LINUX_MAJOR_H
#ifndef MAJOR
#define MAJOR(dev) ((dev)>>8)
#define MINOR(dev) ((dev) & 0xff)
#endif
#ifndef SCSI_BLK_MAJOR
#ifdef SCSI_DISK0_MAJOR
#ifdef SCSI_DISK8_MAJOR
#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR) || \
((M) >= SCSI_DISK8_MAJOR && (M) <= SCSI_DISK15_MAJOR))
#else
#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR))
#endif /* defined(SCSI_DISK8_MAJOR) */
#define SCSI_BLK_MAJOR(M) (SCSI_DISK_MAJOR((M)) || (M) == SCSI_CDROM_MAJOR)
#else
#define SCSI_BLK_MAJOR(M) ((M) == SCSI_DISK_MAJOR || (M) == SCSI_CDROM_MAJOR)
#endif /* defined(SCSI_DISK0_MAJOR) */
#endif /* defined(SCSI_BLK_MAJOR) */
if (((MAJOR(s.st_rdev) == HD_MAJOR &&
MINOR(s.st_rdev)%64 == 0) ||
(SCSI_BLK_MAJOR(MAJOR(s.st_rdev)) &&
MINOR(s.st_rdev)%16 == 0))) {
printf(_("%s is entire device, not just one partition!\n"),
device);
proceed_question();
}
#endif
}
static errcode_t unix_open(const char *name, int flags, io_channel *channel)
{
io_channel io = NULL;
struct unix_private_data *data = NULL;
errcode_t retval;
int open_flags, zeroes = 0;
int f_nocache = 0;
ext2fs_struct_stat st;
#ifdef __linux__
struct utsname ut;
#endif
if (name == 0)
return EXT2_ET_BAD_DEVICE_NAME;
retval = ext2fs_get_mem(sizeof(struct struct_io_channel), &io);
if (retval)
goto cleanup;
memset(io, 0, sizeof(struct struct_io_channel));
io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
retval = ext2fs_get_mem(sizeof(struct unix_private_data), &data);
if (retval)
goto cleanup;
io->manager = unix_io_manager;
retval = ext2fs_get_mem(strlen(name)+1, &io->name);
if (retval)
goto cleanup;
strcpy(io->name, name);
io->private_data = data;
io->block_size = 1024;
io->read_error = 0;
io->write_error = 0;
io->refcount = 1;
memset(data, 0, sizeof(struct unix_private_data));
data->magic = EXT2_ET_MAGIC_UNIX_IO_CHANNEL;
data->io_stats.num_fields = 2;
open_flags = (flags & IO_FLAG_RW) ? O_RDWR : O_RDONLY;
if (flags & IO_FLAG_EXCLUSIVE)
open_flags |= O_EXCL;
#if defined(O_DIRECT)
if (flags & IO_FLAG_DIRECT_IO) {
open_flags |= O_DIRECT;
io->align = ext2fs_get_dio_alignment(data->dev);
}
#elif defined(F_NOCACHE)
if (flags & IO_FLAG_DIRECT_IO) {
f_nocache = F_NOCACHE;
io->align = 4096;
}
#endif
data->flags = flags;
data->dev = ext2fs_open_file(io->name, open_flags, 0);
if (data->dev < 0) {
retval = errno;
goto cleanup;
}
if (f_nocache) {
if (fcntl(data->dev, f_nocache, 1) < 0) {
retval = errno;
goto cleanup;
}
}
/*
* If the device is really a block device, then set the
* appropriate flag, otherwise we can set DISCARD_ZEROES flag
* because we are going to use punch hole instead of discard
* and if it succeed, subsequent read from sparse area returns
* zero.
*/
if (ext2fs_stat(io->name, &st) == 0) {
if (S_ISBLK(st.st_mode))
io->flags |= CHANNEL_FLAGS_BLOCK_DEVICE;
else
io->flags |= CHANNEL_FLAGS_DISCARD_ZEROES;
}
#ifdef BLKDISCARDZEROES
ioctl(data->dev, BLKDISCARDZEROES, &zeroes);
if (zeroes)
io->flags |= CHANNEL_FLAGS_DISCARD_ZEROES;
#endif
#if defined(__CYGWIN__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
/*
* Some operating systems require that the buffers be aligned,
* regardless of O_DIRECT
*/
if (!io->align)
io->align = 512;
#endif
if ((retval = alloc_cache(io, data)))
goto cleanup;
#ifdef BLKROGET
if (flags & IO_FLAG_RW) {
int error;
int readonly = 0;
/* Is the block device actually writable? */
error = ioctl(data->dev, BLKROGET, &readonly);
if (!error && readonly) {
close(data->dev);
retval = EPERM;
goto cleanup;
}
}
#endif
#ifdef __linux__
#undef RLIM_INFINITY
#if (defined(__alpha__) || ((defined(__sparc__) || defined(__mips__)) && (SIZEOF_LONG == 4)))
#define RLIM_INFINITY ((unsigned long)(~0UL>>1))
#else
#define RLIM_INFINITY (~0UL)
#endif
/*
* Work around a bug in 2.4.10-2.4.18 kernels where writes to
* block devices are wrongly getting hit by the filesize
* limit. This workaround isn't perfect, since it won't work
* if glibc wasn't built against 2.2 header files. (Sigh.)
*
*/
if ((flags & IO_FLAG_RW) &&
(uname(&ut) == 0) &&
((ut.release[0] == '2') && (ut.release[1] == '.') &&
(ut.release[2] == '4') && (ut.release[3] == '.') &&
(ut.release[4] == '1') && (ut.release[5] >= '0') &&
(ut.release[5] < '8')) &&
(ext2fs_stat(io->name, &st) == 0) &&
(S_ISBLK(st.st_mode))) {
struct rlimit rlim;
rlim.rlim_cur = rlim.rlim_max = (unsigned long) RLIM_INFINITY;
setrlimit(RLIMIT_FSIZE, &rlim);
getrlimit(RLIMIT_FSIZE, &rlim);
if (((unsigned long) rlim.rlim_cur) <
((unsigned long) rlim.rlim_max)) {
rlim.rlim_cur = rlim.rlim_max;
setrlimit(RLIMIT_FSIZE, &rlim);
}
}
#endif
*channel = io;
return 0;
cleanup:
if (data) {
free_cache(data);
ext2fs_free_mem(&data);
}
if (io)
ext2fs_free_mem(&io);
return retval;
}