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authorLibravatar Marius Storm-Olsen <mstormo_git@storm-olsen.com>2007-09-03 20:40:26 +0200
committerLibravatar Johannes Sixt <johannes.sixt@telecom.at>2008-06-26 08:45:10 +0200
commit5411bdc4e4b170a57a61b2d486ab344896c41500 (patch)
tree9b6f45c1aa790792865f2807417c3790f3291a45
parentWindows: Implement a custom spawnve(). (diff)
downloadtgif-5411bdc4e4b170a57a61b2d486ab344896c41500.tar.xz
Windows: Add a new lstat and fstat implementation based on Win32 API.
This gives us a significant speedup when adding, committing and stat'ing files. Also, since Windows doesn't really handle symlinks, we let stat just uses lstat. We also need to replace fstat, since our implementation and the standard stat() functions report slightly different timestamps, possibly due to timezones. We simply report UTC in our implementation, and do our FILETIME to time_t conversion based on the document at http://support.microsoft.com/kb/167296. With Moe's repo structure (100K files in 100 dirs, containing 2-4 bytes) mkdir bummer && cd bummer; for ((i=0;i<100;i++)); do mkdir $i && pushd $i; for ((j=0;j<1000;j++)); do echo "$j" >$j; done; popd; done We get the following performance boost: With normal lstat & stat Custom lstat/fstat ------------------------ ------------------------ Command: git init Command: git init ------------------------ ------------------------ real 0m 0.047s real 0m 0.063s user 0m 0.031s user 0m 0.015s sys 0m 0.000s sys 0m 0.015s ------------------------ ------------------------ Command: git add . Command: git add . ------------------------ ------------------------ real 0m19.390s real 0m12.031s 1.6x user 0m 0.015s user 0m 0.031s sys 0m 0.030s sys 0m 0.000s ------------------------ ------------------------ Command: git commit -a.. Command: git commit -a.. ------------------------ ------------------------ real 0m30.812s real 0m16.875s 1.8x user 0m 0.015s user 0m 0.015s sys 0m 0.000s sys 0m 0.015s ------------------------ ------------------------ 3x Command: git-status 3x Command: git-status ------------------------ ------------------------ real 0m11.860s real 0m 5.266s 2.2x user 0m 0.015s user 0m 0.015s sys 0m 0.015s sys 0m 0.015s real 0m11.703s real 0m 5.234s user 0m 0.015s user 0m 0.015s sys 0m 0.000s sys 0m 0.000s real 0m11.672s real 0m 5.250s user 0m 0.031s user 0m 0.015s sys 0m 0.000s sys 0m 0.000s ------------------------ ------------------------ Command: git commit... Command: git commit... (single file) (single file) ------------------------ ------------------------ real 0m14.234s real 0m 7.735s 1.8x user 0m 0.015s user 0m 0.031s sys 0m 0.000s sys 0m 0.000s Signed-off-by: Marius Storm-Olsen <mstormo_git@storm-olsen.com> Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
-rw-r--r--compat/mingw.c132
-rw-r--r--compat/mingw.h10
2 files changed, 141 insertions, 1 deletions
diff --git a/compat/mingw.c b/compat/mingw.c
index 1ef2a4caf2..6b742873da 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -23,6 +23,138 @@ int mingw_open (const char *filename, int oflags, ...)
return fd;
}
+static inline time_t filetime_to_time_t(const FILETIME *ft)
+{
+ long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
+ winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
+ winTime /= 10000000; /* Nano to seconds resolution */
+ return (time_t)winTime;
+}
+
+extern int _getdrive( void );
+/* We keep the do_lstat code in a separate function to avoid recursion.
+ * When a path ends with a slash, the stat will fail with ENOENT. In
+ * this case, we strip the trailing slashes and stat again.
+ */
+static int do_lstat(const char *file_name, struct stat *buf)
+{
+ WIN32_FILE_ATTRIBUTE_DATA fdata;
+
+ if (GetFileAttributesExA(file_name, GetFileExInfoStandard, &fdata)) {
+ int fMode = S_IREAD;
+ if (fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+ fMode |= S_IFDIR;
+ else
+ fMode |= S_IFREG;
+ if (!(fdata.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
+ fMode |= S_IWRITE;
+
+ buf->st_ino = 0;
+ buf->st_gid = 0;
+ buf->st_uid = 0;
+ buf->st_nlink = 1;
+ buf->st_mode = fMode;
+ buf->st_size = fdata.nFileSizeLow; /* Can't use nFileSizeHigh, since it's not a stat64 */
+ buf->st_dev = buf->st_rdev = (_getdrive() - 1);
+ buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
+ buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
+ buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
+ errno = 0;
+ return 0;
+ }
+
+ switch (GetLastError()) {
+ case ERROR_ACCESS_DENIED:
+ case ERROR_SHARING_VIOLATION:
+ case ERROR_LOCK_VIOLATION:
+ case ERROR_SHARING_BUFFER_EXCEEDED:
+ errno = EACCES;
+ break;
+ case ERROR_BUFFER_OVERFLOW:
+ errno = ENAMETOOLONG;
+ break;
+ case ERROR_NOT_ENOUGH_MEMORY:
+ errno = ENOMEM;
+ break;
+ default:
+ errno = ENOENT;
+ break;
+ }
+ return -1;
+}
+
+/* We provide our own lstat/fstat functions, since the provided
+ * lstat/fstat functions are so slow. These stat functions are
+ * tailored for Git's usage (read: fast), and are not meant to be
+ * complete. Note that Git stat()s are redirected to mingw_lstat()
+ * too, since Windows doesn't really handle symlinks that well.
+ */
+int mingw_lstat(const char *file_name, struct stat *buf)
+{
+ int namelen;
+ static char alt_name[PATH_MAX];
+
+ if (!do_lstat(file_name, buf))
+ return 0;
+
+ /* if file_name ended in a '/', Windows returned ENOENT;
+ * try again without trailing slashes
+ */
+ if (errno != ENOENT)
+ return -1;
+
+ namelen = strlen(file_name);
+ if (namelen && file_name[namelen-1] != '/')
+ return -1;
+ while (namelen && file_name[namelen-1] == '/')
+ --namelen;
+ if (!namelen || namelen >= PATH_MAX)
+ return -1;
+
+ memcpy(alt_name, file_name, namelen);
+ alt_name[namelen] = 0;
+ return do_lstat(alt_name, buf);
+}
+
+#undef fstat
+int mingw_fstat(int fd, struct stat *buf)
+{
+ HANDLE fh = (HANDLE)_get_osfhandle(fd);
+ BY_HANDLE_FILE_INFORMATION fdata;
+
+ if (fh == INVALID_HANDLE_VALUE) {
+ errno = EBADF;
+ return -1;
+ }
+ /* direct non-file handles to MS's fstat() */
+ if (GetFileType(fh) != FILE_TYPE_DISK)
+ return fstat(fd, buf);
+
+ if (GetFileInformationByHandle(fh, &fdata)) {
+ int fMode = S_IREAD;
+ if (fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+ fMode |= S_IFDIR;
+ else
+ fMode |= S_IFREG;
+ if (!(fdata.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
+ fMode |= S_IWRITE;
+
+ buf->st_ino = 0;
+ buf->st_gid = 0;
+ buf->st_uid = 0;
+ buf->st_nlink = 1;
+ buf->st_mode = fMode;
+ buf->st_size = fdata.nFileSizeLow; /* Can't use nFileSizeHigh, since it's not a stat64 */
+ buf->st_dev = buf->st_rdev = (_getdrive() - 1);
+ buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
+ buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
+ buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
+ return 0;
+ }
+ errno = EBADF;
+ return -1;
+}
+
unsigned int sleep (unsigned int seconds)
{
Sleep(seconds*1000);
diff --git a/compat/mingw.h b/compat/mingw.h
index 48229d538a..69b1dde3ca 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -60,7 +60,6 @@ struct itimerval {
#define ITIMER_REAL 0
#define st_blocks st_size/512 /* will be cleaned up later */
-#define lstat stat
/*
* trivial stubs
@@ -160,6 +159,15 @@ int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz);
int mingw_rename(const char*, const char*);
#define rename mingw_rename
+/* Use mingw_lstat() instead of lstat()/stat() and
+ * mingw_fstat() instead of fstat() on Windows.
+ */
+int mingw_lstat(const char *file_name, struct stat *buf);
+int mingw_fstat(int fd, struct stat *buf);
+#define fstat mingw_fstat
+#define lstat mingw_lstat
+#define stat(x,y) mingw_lstat(x,y)
+
pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env);
void mingw_execvp(const char *cmd, char *const *argv);
#define execvp mingw_execvp