um: switch cow_user.h to htobe{32,64}/betoh{32,64}

... rather than open-coding the 64bit versions.  endian.h has those guys.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>

diff --git a/arch/um/drivers/cow.h b/arch/um/drivers/cow.h
index dc36b222100b9abde780f996407a758f336afce4..6673508f342603554c4fbe874511ab6df14af45f 100644 (file)
--- a/arch/um/drivers/cow.h
+++ b/arch/um/drivers/cow.h
@@ -3,41 +3,6 @@
 
 #include <asm/types.h>
 
-#if defined(__KERNEL__)
-
-# include <asm/byteorder.h>
-
-# if defined(__BIG_ENDIAN)
-#      define ntohll(x) (x)
-#      define htonll(x) (x)
-# elif defined(__LITTLE_ENDIAN)
-#      define ntohll(x)  be64_to_cpu(x)
-#      define htonll(x)  cpu_to_be64(x)
-# else
-#      error "Could not determine byte order"
-# endif
-
-#else
-/* For the definition of ntohl, htonl and __BYTE_ORDER */
-#include <endian.h>
-#include <netinet/in.h>
-#if defined(__BYTE_ORDER)
-
-#  if __BYTE_ORDER == __BIG_ENDIAN
-#      define ntohll(x) (x)
-#      define htonll(x) (x)
-#  elif __BYTE_ORDER == __LITTLE_ENDIAN
-#      define ntohll(x)  bswap_64(x)
-#      define htonll(x)  bswap_64(x)
-#  else
-#      error "Could not determine byte order: __BYTE_ORDER uncorrectly defined"
-#  endif
-
-#else  /* ! defined(__BYTE_ORDER) */
-#      error "Could not determine byte order: __BYTE_ORDER not defined"
-#endif
-#endif /* ! defined(__KERNEL__) */
-
 extern int init_cow_file(int fd, char *cow_file, char *backing_file,
                         int sectorsize, int alignment, int *bitmap_offset_out,
                         unsigned long *bitmap_len_out, int *data_offset_out);

diff --git a/arch/um/drivers/cow_user.c b/arch/um/drivers/cow_user.c
index 9cbb426c0b9183e8a5c65afe47483f47e00da0ec..0ee9cc6cc4c79dfb4d78fd8fa15072294c62568f 100644 (file)
--- a/arch/um/drivers/cow_user.c
+++ b/arch/um/drivers/cow_user.c
@@ -8,11 +8,10 @@
  * that.
  */
 #include <unistd.h>
-#include <byteswap.h>
 #include <errno.h>
 #include <string.h>
 #include <arpa/inet.h>
-#include <asm/types.h>
+#include <endian.h>
 #include "cow.h"
 #include "cow_sys.h"
 
@@ -214,8 +213,8 @@ int write_cow_header(char *cow_file, int fd, char *backing_file,
                           "header\n");
                goto out;
        }
-       header->magic = htonl(COW_MAGIC);
-       header->version = htonl(COW_VERSION);
+       header->magic = htobe32(COW_MAGIC);
+       header->version = htobe32(COW_VERSION);
 
        err = -EINVAL;
        if (strlen(backing_file) > sizeof(header->backing_file) - 1) {
@@ -246,10 +245,10 @@ int write_cow_header(char *cow_file, int fd, char *backing_file,
                goto out_free;
        }
 
-       header->mtime = htonl(modtime);
-       header->size = htonll(*size);
-       header->sectorsize = htonl(sectorsize);
-       header->alignment = htonl(alignment);
+       header->mtime = htobe32(modtime);
+       header->size = htobe64(*size);
+       header->sectorsize = htobe32(sectorsize);
+       header->alignment = htobe32(alignment);
        header->cow_format = COW_BITMAP;
 
        err = cow_write_file(fd, header, sizeof(*header));
@@ -301,8 +300,8 @@ int read_cow_header(int (*reader)(__u64, char *, int, void *), void *arg,
        magic = header->v1.magic;
        if (magic == COW_MAGIC)
                version = header->v1.version;
-       else if (magic == ntohl(COW_MAGIC))
-               version = ntohl(header->v1.version);
+       else if (magic == be32toh(COW_MAGIC))
+               version = be32toh(header->v1.version);
        /* No error printed because the non-COW case comes through here */
        else goto out;
 
@@ -327,9 +326,9 @@ int read_cow_header(int (*reader)(__u64, char *, int, void *), void *arg,
                                   "header\n");
                        goto out;
                }
-               *mtime_out = ntohl(header->v2.mtime);
-               *size_out = ntohll(header->v2.size);
-               *sectorsize_out = ntohl(header->v2.sectorsize);
+               *mtime_out = be32toh(header->v2.mtime);
+               *size_out = be64toh(header->v2.size);
+               *sectorsize_out = be32toh(header->v2.sectorsize);
                *bitmap_offset_out = sizeof(header->v2);
                *align_out = *sectorsize_out;
                file = header->v2.backing_file;
@@ -341,10 +340,10 @@ int read_cow_header(int (*reader)(__u64, char *, int, void *), void *arg,
                                   "header\n");
                        goto out;
                }
-               *mtime_out = ntohl(header->v3.mtime);
-               *size_out = ntohll(header->v3.size);
-               *sectorsize_out = ntohl(header->v3.sectorsize);
-               *align_out = ntohl(header->v3.alignment);
+               *mtime_out = be32toh(header->v3.mtime);
+               *size_out = be64toh(header->v3.size);
+               *sectorsize_out = be32toh(header->v3.sectorsize);
+               *align_out = be32toh(header->v3.alignment);
                if (*align_out == 0) {
                        cow_printf("read_cow_header - invalid COW header, "
                                   "align == 0\n");
@@ -366,16 +365,16 @@ int read_cow_header(int (*reader)(__u64, char *, int, void *), void *arg,
                 * this was used until Dec2005 - 64bits are needed to represent
                 * 2038+. I.e. we can safely do this truncating cast.
                 *
-                * Additionally, we must use ntohl() instead of ntohll(), since
+                * Additionally, we must use be32toh() instead of be64toh(), since
                 * the program used to use the former (tested - I got mtime
                 * mismatch "0 vs whatever").
                 *
                 * Ever heard about bug-to-bug-compatibility ? ;-) */
-               *mtime_out = (time32_t) ntohl(header->v3_b.mtime);
+               *mtime_out = (time32_t) be32toh(header->v3_b.mtime);
 
-               *size_out = ntohll(header->v3_b.size);
-               *sectorsize_out = ntohl(header->v3_b.sectorsize);
-               *align_out = ntohl(header->v3_b.alignment);
+               *size_out = be64toh(header->v3_b.size);
+               *sectorsize_out = be32toh(header->v3_b.sectorsize);
+               *align_out = be32toh(header->v3_b.alignment);
                if (*align_out == 0) {
                        cow_printf("read_cow_header - invalid COW header, "
                                   "align == 0\n");