gwj / at91sam9263 · Commits

Commit beac80cd437fb383eeaccc4224a4d7faebd77a23

Authored by bellard
1 parent 3587d7e6

Windows sparse file support (Frediano Ziglio) 


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2027 c046a42c-6fe2-441c-8c8c-71466251a162
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Showing 3 changed files with 50 additions and 2 deletions
Changelog
  View file @beac80c
... ... @@ -10,6 +10,7 @@ version 0.8.2:
10 10 - USB updates (Paul Brook)
11 11 - UDP character devices (Jason Wessel)
12 12 - TCP character devices
  13 + - Windows sparse file support (Frediano Ziglio)
13 14  
14 15 version 0.8.1:
15 16  
... ...
... ... @@ -761,6 +761,51 @@ static void raw_close(BlockDriverState *bs)
761 761 close(s->fd);
762 762 }
763 763  
  764 +#ifdef _WIN32
  765 +#include <windows.h>
  766 +#include <winioctl.h>
  767 +
  768 +int qemu_ftruncate64(int fd, int64_t length)
  769 +{
  770 + LARGE_INTEGER li;
  771 + LONG high;
  772 + HANDLE h;
  773 + BOOL res;
  774 +
  775 + if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
  776 + return -1;
  777 +
  778 + h = (HANDLE)_get_osfhandle(fd);
  779 +
  780 + /* get current position, ftruncate do not change position */
  781 + li.HighPart = 0;
  782 + li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
  783 + if (li.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
  784 + return -1;
  785 +
  786 + high = length >> 32;
  787 + if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN))
  788 + return -1;
  789 + res = SetEndOfFile(h);
  790 +
  791 + /* back to old position */
  792 + SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
  793 + return res ? 0 : -1;
  794 +}
  795 +
  796 +static int set_sparse(int fd)
  797 +{
  798 + DWORD returned;
  799 + return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
  800 + NULL, 0, NULL, 0, &returned, NULL);
  801 +}
  802 +#else
  803 +static inline int set_sparse(int fd)
  804 +{
  805 + return 1;
  806 +}
  807 +#endif
  808 +
764 809 static int raw_create(const char *filename, int64_t total_size,
765 810 const char *backing_file, int flags)
766 811 {
... ... @@ -773,6 +818,7 @@ static int raw_create(const char *filename, int64_t total_size,
773 818 0644);
774 819 if (fd < 0)
775 820 return -EIO;
  821 + set_sparse(fd);
776 822 ftruncate(fd, total_size * 512);
777 823 close(fd);
778 824 return 0;
... ...
... ... @@ -51,8 +51,9 @@
51 51 #define fsync _commit
52 52 #define lseek _lseeki64
53 53 #define ENOTSUP 4096
54   -/* XXX: find 64 bit version */
55   -#define ftruncate chsize
  54 +extern int qemu_ftruncate64(int, int64_t);
  55 +#define ftruncate qemu_ftruncate64
  56 +
56 57  
57 58 static inline char *realpath(const char *path, char *resolved_path)
58 59 {
... ...