Extend the MTD user ABI to access >4GiB devices using 64-bit offsets.
New ioctls: MEMGETINFO64 MEMERASE64 MEMWRITEOOB64 MEMREADOOB64
MEMLOCK64 MEMUNLOCK64 MEMGETREGIONINFO64
Compat ioctls: MEMWRITEOOB64_32 MEMREADOOB64_32
This patch went through several iterations on the linux-mtd list. The
only difference from v3 is formatting (fixed checkpatch.pl errors). I
am now submitting it for inclusion in 2.6.30.
The corresponding mtd-utils patch was also posted on the linux-mtd list,
and used to test the new kernel ioctls.
This will apply against the HEAD of the mtd-2.6 tree, not Linus' tree,
per the guidelines at http://www.linux-mtd.infradead.org/source.html .
Signed-off-by: Kevin Cernekee <[email protected]>
Cc: David Woodhouse <[email protected]>
---
drivers/mtd/mtdchar.c | 153 ++++++++++++++++++++++++++++++++++++++++++------
fs/compat_ioctl.c | 52 ++++++++++++++++-
include/mtd/mtd-abi.h | 57 ++++++++++++++++--
include/mtd/mtd-user.h | 4 +
4 files changed, 239 insertions(+), 27 deletions(-)
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index f478f1f..7d957b5 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -391,6 +391,7 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
int ret = 0;
u_long size;
struct mtd_info_user info;
+ struct mtd_info_user64 info64;
DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
@@ -429,6 +430,26 @@ static int mtd_ioctl(struct inode *inode, struct
file *file,
break;
}
+ case MEMGETREGIONINFO64:
+ {
+ uint32_t ur_idx;
+ struct mtd_erase_region_info *kr;
+ struct region_info_user64 *ur =
+ (struct region_info_user64 *) argp;
+
+ if (get_user(ur_idx, &(ur->regionindex)))
+ return -EFAULT;
+
+ kr = &(mtd->eraseregions[ur_idx]);
+
+ if (put_user(kr->offset, &(ur->offset))
+ || put_user(kr->erasesize, &(ur->erasesize))
+ || put_user(kr->numblocks, &(ur->numblocks)))
+ return -EFAULT;
+
+ break;
+ }
+
case MEMGETINFO:
info.type = mtd->type;
info.flags = mtd->flags;
@@ -443,7 +464,19 @@ static int mtd_ioctl(struct inode *inode, struct
file *file,
return -EFAULT;
break;
+ case MEMGETINFO64:
+ info64.type = mtd->type;
+ info64.flags = mtd->flags;
+ info64.size = mtd->size;
+ info64.erasesize = mtd->erasesize;
+ info64.writesize = mtd->writesize;
+ info64.oobsize = mtd->oobsize;
+ if (copy_to_user(argp, &info64, sizeof(struct mtd_info_user64)))
+ return -EFAULT;
+ break;
+
case MEMERASE:
+ case MEMERASE64:
{
struct erase_info *erase;
@@ -454,20 +487,32 @@ static int mtd_ioctl(struct inode *inode, struct
file *file,
if (!erase)
ret = -ENOMEM;
else {
- struct erase_info_user einfo;
-
wait_queue_head_t waitq;
DECLARE_WAITQUEUE(wait, current);
init_waitqueue_head(&waitq);
- if (copy_from_user(&einfo, argp,
- sizeof(struct erase_info_user))) {
- kfree(erase);
- return -EFAULT;
+ if (cmd == MEMERASE64) {
+ struct erase_info_user64 einfo64;
+
+ if (copy_from_user(&einfo64, argp,
+ sizeof(struct erase_info_user64))) {
+ kfree(erase);
+ return -EFAULT;
+ }
+ erase->addr = einfo64.start;
+ erase->len = einfo64.length;
+ } else {
+ struct erase_info_user einfo32;
+
+ if (copy_from_user(&einfo32, argp,
+ sizeof(struct erase_info_user))) {
+ kfree(erase);
+ return -EFAULT;
+ }
+ erase->addr = einfo32.start;
+ erase->len = einfo32.length;
}
- erase->addr = einfo.start;
- erase->len = einfo.length;
erase->mtd = mtd;
erase->callback = mtdchar_erase_callback;
erase->priv = (unsigned long)&waitq;
@@ -499,17 +544,37 @@ static int mtd_ioctl(struct inode *inode, struct
file *file,
}
case MEMWRITEOOB:
+ case MEMWRITEOOB64:
{
- struct mtd_oob_buf buf;
+ struct mtd_oob_buf64 buf;
struct mtd_oob_ops ops;
- struct mtd_oob_buf __user *user_buf = argp;
uint32_t retlen;
+ uint32_t __user *retp;
if(!(file->f_mode & FMODE_WRITE))
return -EPERM;
- if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
- return -EFAULT;
+ if (cmd == MEMWRITEOOB64) {
+ struct mtd_oob_buf64 __user *user_buf = argp;
+
+ if (copy_from_user(&buf, argp,
+ sizeof(struct mtd_oob_buf64)))
+ return -EFAULT;
+ retp = &user_buf->length;
+ } else {
+ struct mtd_oob_buf __user *user_buf = argp;
+ struct mtd_oob_buf buf32;
+
+ if (copy_from_user(&buf32, argp,
+ sizeof(struct mtd_oob_buf)))
+ return -EFAULT;
+
+ buf.start = buf32.start;
+ buf.length = buf32.length;
+ buf.ptr = buf32.ptr;
+
+ retp = &user_buf->length;
+ }
if (buf.length > 4096)
return -EINVAL;
@@ -540,13 +605,13 @@ static int mtd_ioctl(struct inode *inode, struct
file *file,
return -EFAULT;
}
- buf.start &= ~(mtd->oobsize - 1);
+ buf.start &= ~((uint64_t)mtd->oobsize - 1);
ret = mtd->write_oob(mtd, buf.start, &ops);
if (ops.oobretlen > 0xFFFFFFFFU)
ret = -EOVERFLOW;
retlen = ops.oobretlen;
- if (copy_to_user(&user_buf->length, &retlen, sizeof(buf.length)))
+ if (copy_to_user(retp, &retlen, sizeof(buf.length)))
ret = -EFAULT;
kfree(ops.oobbuf);
@@ -555,12 +620,34 @@ static int mtd_ioctl(struct inode *inode, struct
file *file,
}
case MEMREADOOB:
+ case MEMREADOOB64:
{
- struct mtd_oob_buf buf;
+ struct mtd_oob_buf64 buf;
struct mtd_oob_ops ops;
+ uint32_t __user *retp;
- if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
- return -EFAULT;
+ if (cmd == MEMREADOOB64) {
+ struct mtd_oob_buf64 __user *user_buf = argp;
+
+ if (copy_from_user(&buf, user_buf,
+ sizeof(struct mtd_oob_buf64)))
+ return -EFAULT;
+
+ retp = &user_buf->length;
+ } else {
+ struct mtd_oob_buf __user *user_buf = argp;
+ struct mtd_oob_buf buf32;
+
+ if (copy_from_user(&buf32, user_buf,
+ sizeof(struct mtd_oob_buf)))
+ return -EFAULT;
+ buf.start = buf32.start;
+ buf.length = buf32.length;
+ buf.ptr = buf32.ptr;
+
+ /* MEMREADOOB returned length goes in "start" field */
+ retp = &user_buf->start;
+ }
if (buf.length > 4096)
return -EINVAL;
@@ -585,10 +672,10 @@ static int mtd_ioctl(struct inode *inode, struct
file *file,
if (!ops.oobbuf)
return -ENOMEM;
- buf.start &= ~(mtd->oobsize - 1);
+ buf.start &= ~((uint64_t)mtd->oobsize - 1);
ret = mtd->read_oob(mtd, buf.start, &ops);
- if (put_user(ops.oobretlen, (uint32_t __user *)argp))
+ if (put_user(ops.oobretlen, retp))
ret = -EFAULT;
else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
ops.oobretlen))
@@ -612,6 +699,20 @@ static int mtd_ioctl(struct inode *inode, struct
file *file,
break;
}
+ case MEMLOCK64:
+ {
+ struct erase_info_user64 einfo64;
+
+ if (copy_from_user(&einfo64, argp, sizeof(einfo64)))
+ return -EFAULT;
+
+ if (!mtd->lock)
+ ret = -EOPNOTSUPP;
+ else
+ ret = mtd->lock(mtd, einfo64.start, einfo64.length);
+ break;
+ }
+
case MEMUNLOCK:
{
struct erase_info_user einfo;
@@ -626,6 +727,20 @@ static int mtd_ioctl(struct inode *inode, struct
file *file,
break;
}
+ case MEMUNLOCK64:
+ {
+ struct erase_info_user64 einfo64;
+
+ if (copy_from_user(&einfo64, argp, sizeof(einfo64)))
+ return -EFAULT;
+
+ if (!mtd->unlock)
+ ret = -EOPNOTSUPP;
+ else
+ ret = mtd->unlock(mtd, einfo64.start, einfo64.length);
+ break;
+ }
+
/* Legacy interface */
case MEMGETOOBSEL:
{
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 45e59d3..e52296d 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -1412,8 +1412,18 @@ struct mtd_oob_buf32 {
compat_caddr_t ptr; /* unsigned char* */
};
-#define MEMWRITEOOB32 _IOWR('M',3,struct mtd_oob_buf32)
-#define MEMREADOOB32 _IOWR('M',4,struct mtd_oob_buf32)
+struct mtd_oob_buf64_32 {
+ u_int64_t start;
+ u_int32_t res0;
+ u_int32_t length;
+ compat_caddr_t ptr;
+ u_int32_t res1[8];
+} __aligned(4) __packed;
+
+#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
+#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
+#define MEMWRITEOOB64_32 _IOWR('M', 22, struct mtd_oob_buf64_32)
+#define MEMREADOOB64_32 _IOWR('M', 23, struct mtd_oob_buf64_32)
static int mtd_rw_oob(unsigned int fd, unsigned int cmd, unsigned long arg)
{
@@ -1446,6 +1456,37 @@ static int mtd_rw_oob(unsigned int fd, unsigned
int cmd, unsigned long arg)
return err;
}
+static int mtd_rw_oob64(unsigned int fd, unsigned int cmd, unsigned long arg)
+{
+ struct mtd_oob_buf64 __user *buf =
+ compat_alloc_user_space(sizeof(*buf));
+ struct mtd_oob_buf64_32 __user *buf32 = compat_ptr(arg);
+ u32 data;
+ char __user *datap;
+ unsigned int real_cmd;
+ int err;
+
+ real_cmd = (cmd == MEMREADOOB64_32) ?
+ MEMREADOOB64 : MEMWRITEOOB64;
+
+ if (copy_in_user(&buf->start, &buf32->start, 2 * sizeof(u64)) ||
+ get_user(data, &buf32->ptr))
+ return -EFAULT;
+ datap = compat_ptr(data);
+ if (put_user(datap, &buf->ptr))
+ return -EFAULT;
+
+ err = sys_ioctl(fd, real_cmd, (unsigned long) buf);
+
+ if (!err) {
+ if (copy_in_user(&buf32->length, &buf->length,
+ sizeof(u32)))
+ err = -EFAULT;
+ }
+
+ return err;
+}
+
#ifdef CONFIG_BLOCK
struct raw32_config_request
{
@@ -2434,6 +2475,11 @@ COMPATIBLE_IOCTL(MEMGETREGIONCOUNT)
COMPATIBLE_IOCTL(MEMGETREGIONINFO)
COMPATIBLE_IOCTL(MEMGETBADBLOCK)
COMPATIBLE_IOCTL(MEMSETBADBLOCK)
+COMPATIBLE_IOCTL(MEMGETINFO64)
+COMPATIBLE_IOCTL(MEMERASE64)
+COMPATIBLE_IOCTL(MEMLOCK64)
+COMPATIBLE_IOCTL(MEMUNLOCK64)
+COMPATIBLE_IOCTL(MEMGETREGIONINFO64)
/* NBD */
ULONG_IOCTL(NBD_SET_SOCK)
ULONG_IOCTL(NBD_SET_BLKSIZE)
@@ -2545,6 +2591,8 @@ COMPATIBLE_IOCTL(JSIOCGNAME(0))
/* now things that need handlers */
HANDLE_IOCTL(MEMREADOOB32, mtd_rw_oob)
HANDLE_IOCTL(MEMWRITEOOB32, mtd_rw_oob)
+HANDLE_IOCTL(MEMREADOOB64_32, mtd_rw_oob64)
+HANDLE_IOCTL(MEMWRITEOOB64_32, mtd_rw_oob64)
#ifdef CONFIG_NET
HANDLE_IOCTL(SIOCGIFNAME, dev_ifname32)
HANDLE_IOCTL(SIOCGIFCONF, dev_ifconf)
diff --git a/include/mtd/mtd-abi.h b/include/mtd/mtd-abi.h
index c6c61cd..5d71c4e 100644
--- a/include/mtd/mtd-abi.h
+++ b/include/mtd/mtd-abi.h
@@ -10,12 +10,26 @@ struct erase_info_user {
uint32_t length;
};
+struct erase_info_user64 {
+ uint64_t start;
+ uint64_t length;
+ uint32_t res0[8];
+};
+
struct mtd_oob_buf {
uint32_t start;
uint32_t length;
unsigned char __user *ptr;
};
+struct mtd_oob_buf64 {
+ uint64_t start;
+ uint32_t res0;
+ uint32_t length;
+ unsigned char __user *ptr;
+ uint32_t res1[8];
+};
+
#define MTD_ABSENT 0
#define MTD_RAM 1
#define MTD_ROM 2
@@ -50,14 +64,25 @@ struct mtd_oob_buf {
struct mtd_info_user {
uint8_t type;
uint32_t flags;
- uint32_t size; // Total size of the MTD
+ uint32_t size; /* Total size of the MTD */
+ uint32_t erasesize;
+ uint32_t writesize;
+ uint32_t oobsize; /* OOB bytes per page (e.g. 16) */
+ uint32_t ecctype; /* Obsolete, always reports -1 */
+ uint32_t eccsize; /* Obsolete, always reports 0 */
+};
+
+struct mtd_info_user64 {
+ uint32_t type;
+ uint32_t flags;
+ uint64_t size; /* Total size of the MTD */
+ uint32_t res0;
uint32_t erasesize;
+ uint32_t res1;
uint32_t writesize;
- uint32_t oobsize; // Amount of OOB data per block (e.g. 16)
- /* The below two fields are obsolete and broken, do not use them
- * (TODO: remove at some point) */
- uint32_t ecctype;
- uint32_t eccsize;
+ uint32_t res2;
+ uint32_t oobsize; /* OOB bytes per page (e.g. 16) */
+ uint32_t res3[32];
};
struct region_info_user {
@@ -68,6 +93,18 @@ struct region_info_user {
uint32_t regionindex;
};
+struct region_info_user64 {
+ uint64_t offset; /* At which this region starts,
+ * from the beginning of the MTD */
+ uint32_t res0;
+ uint32_t erasesize; /* For this region */
+ uint32_t res1;
+ uint32_t numblocks; /* Number of blocks in this region */
+ uint32_t res2;
+ uint32_t regionindex;
+ uint32_t res3[16];
+};
+
struct otp_info {
uint32_t start;
uint32_t length;
@@ -94,6 +131,14 @@ struct otp_info {
#define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats)
#define MTDFILEMODE _IO('M', 19)
+#define MEMGETINFO64 _IOR('M', 20, struct mtd_info_user64)
+#define MEMERASE64 _IOW('M', 21, struct erase_info_user64)
+#define MEMWRITEOOB64 _IOWR('M', 22, struct mtd_oob_buf64)
+#define MEMREADOOB64 _IOWR('M', 23, struct mtd_oob_buf64)
+#define MEMLOCK64 _IOW('M', 24, struct erase_info_user64)
+#define MEMUNLOCK64 _IOW('M', 25, struct erase_info_user64)
+#define MEMGETREGIONINFO64 _IOWR('M', 26, struct region_info_user64)
+
/*
* Obsolete legacy interface. Keep it in order not to break userspace
* interfaces
diff --git a/include/mtd/mtd-user.h b/include/mtd/mtd-user.h
index 170ceca..1b0da98 100644
--- a/include/mtd/mtd-user.h
+++ b/include/mtd/mtd-user.h
@@ -16,4 +16,8 @@ typedef struct region_info_user region_info_t;
typedef struct nand_oobinfo nand_oobinfo_t;
typedef struct nand_ecclayout nand_ecclayout_t;
+typedef struct mtd_info_user64 mtd_info64_t;
+typedef struct erase_info_user64 erase_info64_t;
+typedef struct region_info_user64 region_info64_t;
+
#endif /* __MTD_USER_H__ */
--
1.5.6.3
On Mon, 2009-03-30 at 18:14 -0700, Kevin Cernekee wrote:
> #define MTD_ABSENT 0
> #define MTD_RAM 1
> #define MTD_ROM 2
> @@ -50,14 +64,25 @@ struct mtd_oob_buf {
> struct mtd_info_user {
> uint8_t type;
> uint32_t flags;
> - uint32_t size; // Total size of the MTD
> + uint32_t size; /* Total size of the MTD */
> + uint32_t erasesize;
> + uint32_t writesize;
> + uint32_t oobsize; /* OOB bytes per page (e.g. 16) */
> + uint32_t ecctype; /* Obsolete, always reports -1 */
> + uint32_t eccsize; /* Obsolete, always reports 0 */
> +};
> +
> +struct mtd_info_user64 {
> + uint32_t type;
> + uint32_t flags;
> + uint64_t size; /* Total size of the MTD */
> + uint32_t res0;
> uint32_t erasesize;
> + uint32_t res1;
> uint32_t writesize;
> - uint32_t oobsize; // Amount of OOB data per block (e.g. 16)
> - /* The below two fields are obsolete and broken, do not use them
> - * (TODO: remove at some point) */
> - uint32_t ecctype;
> - uint32_t eccsize;
> + uint32_t res2;
> + uint32_t oobsize; /* OOB bytes per page (e.g. 16) */
> + uint32_t res3[32];
> };
>
> struct region_info_user {
> @@ -68,6 +93,18 @@ struct region_info_user {
> uint32_t regionindex;
> };
>
> +struct region_info_user64 {
> + uint64_t offset; /* At which this region starts,
> + * from the beginning of the MTD */
> + uint32_t res0;
> + uint32_t erasesize; /* For this region */
> + uint32_t res1;
> + uint32_t numblocks; /* Number of blocks in this region */
> + uint32_t res2;
> + uint32_t regionindex;
> + uint32_t res3[16];
> +};
Your arguments vs. ioctls are valid, but sysfs is still better, because
ioctls are not very extendible. E.g., UBI utilities need sub-page size,
but ioctl's do not provide it, and I have no possibility to ask the
kernel about this. And I cannot add it, at least to old ioctls. With
sysfs, I can just add a sysfs file. This is much better.
David Brownell send 2 patches very recently which add sysfs to
MTD. I would recommend you to take them and work on top, and export
information via sysfs, still...
Thanks.
--
Best regards,
Artem Bityutskiy (Битюцкий Артём)
On Tuesday 31 March 2009, Kevin Cernekee wrote:
> +struct mtd_oob_buf64 {
> + uint64_t start;
> + uint32_t res0;
> + uint32_t length;
> + unsigned char __user *ptr;
> + uint32_t res1[8];
> +};
Does this have to use an indirect pointer? We normally try to avoid
ioctl interfaces like this, because they are hard to trace and you
need a compat wrapper. You might be able to at least avoid the wrapper
by defining the data structure with a __u64 to take the pointer.
If you leave the data structure the way it is, you should at least
move the compat_ioctl handling into mtdchar.c from compat_ioctl.c.
It will simplify your code and help reduce the size of the common
ioctl handling.
Arnd <><
On Tue, Mar 31, 2009 at 3:51 AM, Arnd Bergmann <[email protected]> wrote:
> On Tuesday 31 March 2009, Kevin Cernekee wrote:
>> +struct mtd_oob_buf64 {
>> + uint64_t start;
>> + uint32_t res0;
>> + uint32_t length;
>> + unsigned char __user *ptr;
>> + uint32_t res1[8];
>> +};
>
> Does this have to use an indirect pointer? We normally try to avoid
> ioctl interfaces like this, because they are hard to trace and you
> need a compat wrapper. You might be able to at least avoid the wrapper
> by defining the data structure with a __u64 to take the pointer.
Could you please point out another ioctl that is set up this way, so
that I can follow the same conventions?
Are we ever worried about pointers that are larger than 64 bits, or
ints that are larger than 32 bits? Or is it generally OK to assume
this will never happen?
> If you leave the data structure the way it is, you should at least
> move the compat_ioctl handling into mtdchar.c from compat_ioctl.c.
> It will simplify your code and help reduce the size of the common
> ioctl handling.
Is this what you are recommending?
1) Leave existing MTD COMPATIBLE_IOCTLs in fs/compat_ioctl.c
2) Implement compat_ioctl handler in mtdchar.c for MEMREADOOB64_32 and
MEMWRITEOOB64_32
3) For all other commands, the new handler should return -ENOIOCTLCMD
and let fs/compat_ioctl.c handle them
Would it be a good idea to move MTDREADOOB32 / MEMWRITEOOB32 out of
fs/compat_ioctl.c at the same time, so that everything is in one
place?
If the compat wrappers are moved to mtdchar.c , does that imply that
they should be reimplemented "natively" instead of using
compat_alloc_user_space(), copy_in_user(), and sys_ioctl() to cause
them to reinvoke the 64-bit versions?
Thanks.
On Tuesday 31 March 2009, Kevin Cernekee wrote:
> On Tue, Mar 31, 2009 at 3:51 AM, Arnd Bergmann <[email protected]> wrote:
> > On Tuesday 31 March 2009, Kevin Cernekee wrote:
> >> +struct mtd_oob_buf64 {
> >> + uint64_t start;
> >> + uint32_t res0;
> >> + uint32_t length;
> >> + unsigned char __user *ptr;
> >> + uint32_t res1[8];
> >> +};
> >
> > Does this have to use an indirect pointer? We normally try to avoid
> > ioctl interfaces like this, because they are hard to trace and you
> > need a compat wrapper. You might be able to at least avoid the wrapper
> > by defining the data structure with a __u64 to take the pointer.
>
> Could you please point out another ioctl that is set up this way, so
> that I can follow the same conventions?
struct signalfd_siginfo uses __u64 to store pointers, and so does
the sg_io_v4 ioctl. Some of the ioctls in kvm.h also use __u64
for addresses.
> Are we ever worried about pointers that are larger than 64 bits, or
> ints that are larger than 32 bits? Or is it generally OK to assume
> this will never happen?
None of these is a worry, as we already rely on the size of int, long
and pointer in a lot of ways.
> > If you leave the data structure the way it is, you should at least
> > move the compat_ioctl handling into mtdchar.c from compat_ioctl.c.
> > It will simplify your code and help reduce the size of the common
> > ioctl handling.
>
> Is this what you are recommending?
>
> 1) Leave existing MTD COMPATIBLE_IOCTLs in fs/compat_ioctl.c
>
> 2) Implement compat_ioctl handler in mtdchar.c for MEMREADOOB64_32 and
> MEMWRITEOOB64_32
>
> 3) For all other commands, the new handler should return -ENOIOCTLCMD
> and let fs/compat_ioctl.c handle them
Yes, that would be good.
> Would it be a good idea to move MTDREADOOB32 / MEMWRITEOOB32 out of
> fs/compat_ioctl.c at the same time, so that everything is in one
> place?
Yes, I'd like to see this as a separate patch either before or
after the other one. I have the long-term goal of getting rid of
all the wrapper functions in fs/compat_ioctl.c, but it's stalled
for some time.
> If the compat wrappers are moved to mtdchar.c , does that imply that
> they should be reimplemented "natively" instead of using
> compat_alloc_user_space(), copy_in_user(), and sys_ioctl() to cause
> them to reinvoke the 64-bit versions?
Right, that is what I mean with 'simplify your code'.
Thanks,
Arnd <><