From: Jens Axboe <axboe@kernel.dk>
Date: Wed, 6 Feb 2013 12:52:12 +0000 (+0100)
Subject: Get rid of fallocate on Windows
X-Git-Tag: fio-2.0.14~29
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=e254d00ba9dfcdf26e6a8fedd2339c16f5a616f7

Get rid of fallocate on Windows

Fallocate is only useful if it is a fast operation, helping the
file system allocate and setup meta data for the given size.
So don't punt to zero filling the entire thing.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/configure b/configure
index 258c8050..d7ca77c8 100755
--- a/configure
+++ b/configure
@@ -200,7 +200,6 @@ CYGWIN*)
   fi
   output_sym "CONFIG_FADVISE"
   output_sym "CONFIG_SOCKLEN_T"
-  output_sym "CONFIG_POSIX_FALLOCATE"
   output_sym "CONFIG_FADVISE"
   output_sym "CONFIG_SFAA"
   output_sym "CONFIG_RUSAGE_THREAD"
diff --git a/os/windows/posix.c b/os/windows/posix.c
index 05fa5a97..de679111 100755
--- a/os/windows/posix.c
+++ b/os/windows/posix.c
@@ -408,53 +408,6 @@ char *basename(char *path)
 	return name;
 }
 
-int posix_fallocate(int fd, off_t offset, off_t len)
-{
-	const int BUFFER_SIZE = 256 * 1024;
-	int rc = 0;
-	char *buf;
-	unsigned int write_len;
-	unsigned int bytes_written;
-	off_t bytes_remaining = len;
-
-	if (len == 0 || offset < 0)
-		return EINVAL;
-
-	buf = malloc(BUFFER_SIZE);
-
-	if (buf == NULL)
-		return ENOMEM;
-
-	memset(buf, 0, BUFFER_SIZE);
-
-	int64_t prev_pos = _telli64(fd);
-
-	if (_lseeki64(fd, offset, SEEK_SET) == -1)
-		return errno;
-
-	while (bytes_remaining > 0) {
-		if (bytes_remaining < BUFFER_SIZE)
-			write_len = (unsigned int)bytes_remaining;
-		else
-			write_len = BUFFER_SIZE;
-
-		bytes_written = _write(fd, buf, write_len);
-		if (bytes_written == -1) {
-			rc = errno;
-			break;
-		}
-
-		/* Don't allow Windows to cache the write: flush it to disk */
-		_commit(fd);
-
-		bytes_remaining -= bytes_written;
-	}
-
-	free(buf);
-	_lseeki64(fd, prev_pos, SEEK_SET);
-	return rc;
-}
-
 int ftruncate(int fildes, off_t length)
 {
 	BOOL bSuccess;