b9f28d8635
The current string_get_size() overflows when the device size goes over 2^64 bytes because the string helper routine computes the suffix from the size in bytes. However, the entirety of Linux thinks in terms of blocks, not bytes, so this will artificially induce an overflow on very large devices. Fix this by making the function string_get_size() take blocks and the block size instead of bytes. This should allow us to keep working until the current SCSI standard overflows. Also fix virtio_blk and mmc (both of which were also artificially multiplying by the block size to pass a byte side to string_get_size()). The mathematics of this is pretty simple: we're taking a product of size in blocks (S) and block size (B) and trying to re-express this in exponential form: S*B = R*N^E (where N, the exponent is either 1000 or 1024) and R < N. Mathematically, S = RS*N^ES and B=RB*N^EB, so if RS*RB < N it's easy to see that S*B = RS*RB*N^(ES+EB). However, if RS*BS > N, we can see that this can be re-expressed as RS*BS = R*N (where R = RS*BS/N < N) so the whole exponent becomes R*N^(ES+EB+1) [jejb: fix incorrect 32 bit do_div spotted by kbuild test robot <fengguang.wu@intel.com>] Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: James Bottomley <JBottomley@Odin.com>
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
#ifndef _LINUX_STRING_HELPERS_H_
|
|
#define _LINUX_STRING_HELPERS_H_
|
|
|
|
#include <linux/types.h>
|
|
|
|
/* Descriptions of the types of units to
|
|
* print in */
|
|
enum string_size_units {
|
|
STRING_UNITS_10, /* use powers of 10^3 (standard SI) */
|
|
STRING_UNITS_2, /* use binary powers of 2^10 */
|
|
};
|
|
|
|
void string_get_size(u64 size, u64 blk_size, enum string_size_units units,
|
|
char *buf, int len);
|
|
|
|
#define UNESCAPE_SPACE 0x01
|
|
#define UNESCAPE_OCTAL 0x02
|
|
#define UNESCAPE_HEX 0x04
|
|
#define UNESCAPE_SPECIAL 0x08
|
|
#define UNESCAPE_ANY \
|
|
(UNESCAPE_SPACE | UNESCAPE_OCTAL | UNESCAPE_HEX | UNESCAPE_SPECIAL)
|
|
|
|
int string_unescape(char *src, char *dst, size_t size, unsigned int flags);
|
|
|
|
static inline int string_unescape_inplace(char *buf, unsigned int flags)
|
|
{
|
|
return string_unescape(buf, buf, 0, flags);
|
|
}
|
|
|
|
static inline int string_unescape_any(char *src, char *dst, size_t size)
|
|
{
|
|
return string_unescape(src, dst, size, UNESCAPE_ANY);
|
|
}
|
|
|
|
static inline int string_unescape_any_inplace(char *buf)
|
|
{
|
|
return string_unescape_any(buf, buf, 0);
|
|
}
|
|
|
|
#define ESCAPE_SPACE 0x01
|
|
#define ESCAPE_SPECIAL 0x02
|
|
#define ESCAPE_NULL 0x04
|
|
#define ESCAPE_OCTAL 0x08
|
|
#define ESCAPE_ANY \
|
|
(ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_SPECIAL | ESCAPE_NULL)
|
|
#define ESCAPE_NP 0x10
|
|
#define ESCAPE_ANY_NP (ESCAPE_ANY | ESCAPE_NP)
|
|
#define ESCAPE_HEX 0x20
|
|
|
|
int string_escape_mem(const char *src, size_t isz, char **dst, size_t osz,
|
|
unsigned int flags, const char *esc);
|
|
|
|
static inline int string_escape_mem_any_np(const char *src, size_t isz,
|
|
char **dst, size_t osz, const char *esc)
|
|
{
|
|
return string_escape_mem(src, isz, dst, osz, ESCAPE_ANY_NP, esc);
|
|
}
|
|
|
|
static inline int string_escape_str(const char *src, char **dst, size_t sz,
|
|
unsigned int flags, const char *esc)
|
|
{
|
|
return string_escape_mem(src, strlen(src), dst, sz, flags, esc);
|
|
}
|
|
|
|
static inline int string_escape_str_any_np(const char *src, char **dst,
|
|
size_t sz, const char *esc)
|
|
{
|
|
return string_escape_str(src, dst, sz, ESCAPE_ANY_NP, esc);
|
|
}
|
|
|
|
#endif
|