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| author |  Junio C Hamano <gitster@pobox.com> | 2016-04-29 12:59:08 -0700 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2016-04-29 12:59:09 -0700 |
| commit | f9dd74134ad98c80f36d2cf57cd368f5efc8df08 (patch) | |
| tree | 3defdc673aac343645aecfc042419c76d9b47877 /compat | |
| parent | Merge branch 'jc/merge-refuse-new-root' (diff) | |
| parent | mmap(win32): avoid expensive fstat() call (diff) | |
| download | tgif-f9dd74134ad98c80f36d2cf57cd368f5efc8df08.tar.xz | |
Merge branch 'js/win32-mmap'
mmap emulation on Windows has been optimized and work better without
consuming paging store when not needed.
* js/win32-mmap:
mmap(win32): avoid expensive fstat() call
mmap(win32): avoid copy-on-write when it is unnecessary
win32mmap: set errno appropriately
Diffstat (limited to 'compat')
| -rw-r--r-- | compat/win32mmap.c | 31 |
1 files changed, 18 insertions, 13 deletions
diff --git a/compat/win32mmap.c b/compat/win32mmap.c index 80a8c9af4f..519d51f2b6 100644 --- a/compat/win32mmap.c +++ b/compat/win32mmap.c @@ -2,37 +2,42 @@ void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) { - HANDLE hmap; + HANDLE osfhandle, hmap; void *temp; - off_t len; - struct stat st; + LARGE_INTEGER len; uint64_t o = offset; uint32_t l = o & 0xFFFFFFFF; uint32_t h = (o >> 32) & 0xFFFFFFFF; - if (!fstat(fd, &st)) - len = st.st_size; - else + osfhandle = (HANDLE)_get_osfhandle(fd); + if (!GetFileSizeEx(osfhandle, &len)) die("mmap: could not determine filesize"); - if ((length + offset) > len) - length = xsize_t(len - offset); + if ((length + offset) > len.QuadPart) + length = xsize_t(len.QuadPart - offset); if (!(flags & MAP_PRIVATE)) die("Invalid usage of mmap when built with USE_WIN32_MMAP"); - hmap = CreateFileMapping((HANDLE)_get_osfhandle(fd), NULL, - PAGE_WRITECOPY, 0, 0, NULL); + hmap = CreateFileMapping(osfhandle, NULL, + prot == PROT_READ ? PAGE_READONLY : PAGE_WRITECOPY, 0, 0, NULL); - if (!hmap) + if (!hmap) { + errno = EINVAL; return MAP_FAILED; + } - temp = MapViewOfFileEx(hmap, FILE_MAP_COPY, h, l, length, start); + temp = MapViewOfFileEx(hmap, prot == PROT_READ ? + FILE_MAP_READ : FILE_MAP_COPY, h, l, length, start); if (!CloseHandle(hmap)) warning("unable to close file mapping handle"); - return temp ? temp : MAP_FAILED; + if (temp) + return temp; + + errno = GetLastError() == ERROR_COMMITMENT_LIMIT ? EFBIG : EINVAL; + return MAP_FAILED; } int git_munmap(void *start, size_t length) |