util: add file size and block size functions

Change-Id: I0d3269805470768ce75e81955db601c48ae0e737
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>

include/spdk/file.h

@@ -0,0 +1,42 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2015 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef SPDK_FILE_H
+#define SPDK_FILE_H
+
+#include <stdint.h>
+
+uint64_t file_get_size(int fd);
+uint32_t dev_get_blocklen(int fd);
+
+#endif

lib/util/Makefile

@@ -35,7 +35,7 @@ include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
 
 CFLAGS += $(DPDK_INC)
 
-C_SRCS = string.c pci.c
+C_SRCS = file.c string.c pci.c
 
 C_OBJS := $(patsubst %.c,%.o,$(C_SRCS))
 

lib/util/file.c

@@ -0,0 +1,106 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2015 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdint.h>
+
+#ifdef __linux__
+#include <linux/fs.h>
+#endif
+
+static uint64_t
+dev_get_size(int fd)
+{
+#if defined(DIOCGMEDIASIZE) /* FreeBSD */
+	off_t size;
+
+	if (ioctl(fd, DIOCGMEDIASIZE, &size) == 0) {
+		return size;
+	}
+#elif defined(__linux__) && defined(BLKGETSIZE64)
+	uint64_t size;
+
+	if (ioctl(fd, BLKGETSIZE64, &size) == 0) {
+		return size;
+	}
+#endif
+
+	return 0;
+}
+
+uint32_t
+dev_get_blocklen(int fd)
+{
+#if defined(DKIOCGETBLOCKSIZE) /* FreeBSD */
+	uint32_t blocklen;
+
+	if (ioctl(fd, DKIOCGETBLOCKSIZE, &blocklen) != 0) {
+		return blocklen;
+	}
+#elif defined(__linux__) && defined(BLKSSZGET)
+	uint32_t blocklen;
+
+	if (ioctl(fd, BLKSSZGET, &blocklen) != 0) {
+		return blocklen;
+	}
+#endif
+
+	/* Assume 512 if none of the other methods worked */
+	return 512;
+}
+
+uint64_t
+file_get_size(int fd)
+{
+	struct stat st;
+
+	if (fstat(fd, &st) != 0) {
+		return 0;
+	}
+
+	if (S_ISLNK(st.st_mode)) {
+		return 0;
+	}
+
+	if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) {
+		return dev_get_size(fd);
+	} else if (S_ISREG(st.st_mode)) {
+		return st.st_size;
+	}
+
+	/* Not REG, CHR or BLK */
+	return 0;
+}