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util: Move qemu_ftruncate64 from block/file-win32.c to oslib-win32.c

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qemu_ftruncate64() is a general-purpose utility function that may be
used outside of the block layer. Move it to util/oslib-win32.c where
other Windows-specific utility functions reside.

Signed-off-by: Nguyen Dinh Phi <phind.uet@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-ID: <20251218085446.462827-3-phind.uet@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Nguyen Dinh Phi
2025-12-18 16:54:46 +08:00
committed by Philippe Mathieu-Daudé
parent c1df49269a
commit 0c9f429ec8
2 changed files with 33 additions and 32 deletions
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32
block/file-win32.c
View File

@@ -170,38 +170,6 @@ static BlockAIOCB *paio_submit(BlockDriverState *bs, HANDLE hfile,
return thread_pool_submit_aio(aio_worker, acb, cb, opaque);
}
int qemu_ftruncate64(int fd, int64_t length)
{
LARGE_INTEGER li;
DWORD dw;
LONG high;
HANDLE h;
BOOL res;
if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
return -1;
h = (HANDLE)_get_osfhandle(fd);
/* get current position, ftruncate do not change position */
li.HighPart = 0;
li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
return -1;
}
high = length >> 32;
dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
return -1;
}
res = SetEndOfFile(h);
/* back to old position */
SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
return res ? 0 : -1;
}
static int set_sparse(int fd)
{
DWORD returned;

33
util/oslib-win32.c
View File

@@ -899,3 +899,36 @@ int qemu_shm_alloc(size_t size, Error **errp)
error_setg(errp, "Shared memory is not supported.");
return -1;
}
int qemu_ftruncate64(int fd, int64_t length)
{
LARGE_INTEGER li;
DWORD dw;
LONG high;
HANDLE h;
BOOL res;
if ((GetVersion()&0x80000000UL) && (length >> 32) != 0) {
return -1;
}
h = (HANDLE)_get_osfhandle(fd);
/* get current position, ftruncate do not change position */
li.HighPart = 0;
li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
return -1;
}
high = length >> 32;
dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
return -1;
}
res = SetEndOfFile(h);
/* back to old position */
SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
return res ? 0 : -1;
}