linux-kernel - [PATCH] f2fs_io: add erase option

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Message-Id: <20201013172240.251899-1-oceanchen@google.com>
Date:   Wed, 14 Oct 2020 01:22:40 +0800
From:   Ocean Chen <oceanchen@...gle.com>
To:     jaegeuk@...nel.org, yuchao0@...wei.com,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Cc:     oceanchen@...gle.com
Subject: [PATCH] f2fs_io: add erase option

f2fs_io erase [block_device_path]

Signed-off-by: Ocean Chen <oceanchen@...gle.com>
---
 tools/f2fs_io/f2fs_io.c | 53 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c
index 1ca82f1..cef32b1 100644
--- a/tools/f2fs_io/f2fs_io.c
+++ b/tools/f2fs_io/f2fs_io.c
@@ -24,13 +24,13 @@
 #include <getopt.h>
 #include <inttypes.h>
 #include <limits.h>
+#include <linux/fs.h>
 #include <signal.h>
 #include <stdarg.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <string.h>
 #include <sys/mman.h>
 #include <sys/sendfile.h>
 #include <sys/stat.h>
@@ -432,6 +432,56 @@ static void do_fallocate(int argc, char **argv, const struct cmd_desc *cmd)
 	exit(0);
 }
 
+#define erase_desc "erase a block device"
+#define erase_help				\
+"f2fs_io erase [block_device_path]\n\n"		\
+"Send DISCARD | BLKSECDISCARD comamnd to"	\
+"block device in block_device_path\n"		\
+
+static void do_erase(int argc, char **argv, const struct cmd_desc *cmd)
+{
+	int fd, ret;
+	struct stat st;
+	u64 range[2];
+
+	if (argc != 2) {
+		fputs("Excess arguments\n\n", stderr);
+		fputs(cmd->cmd_help, stderr);
+		exit(1);
+	}
+
+	if (stat(argv[1], &st) != 0) {
+		fputs("stat error\n", stderr);
+		exit(1);
+	}
+
+	if (!S_ISBLK(st.st_mode)) {
+		fputs(argv[1], stderr);
+		fputs(" is not a block device\n", stderr);
+		exit(1);
+	}
+
+	fd = xopen(argv[1], O_WRONLY, 0);
+
+	range[0] = 0;
+	ret = ioctl(fd, BLKGETSIZE64, &range[1]);
+	if (ret < 0) {
+		fputs("get size failed\n", stderr);
+		exit(1);
+	}
+
+	ret = ioctl(fd, BLKSECDISCARD, &range);
+	if (ret < 0) {
+		ret = ioctl(fd, BLKDISCARD, &range);
+		if (ret < 0) {
+			fputs("Discard failed\n", stderr);
+			exit(1);
+		}
+	}
+
+	exit(0);
+}
+
 #define write_desc "write data into file"
 #define write_help					\
 "f2fs_io write [chunk_size in 4kb] [offset in chunk_size] [count] [pattern] [IO] [file_path]\n\n"	\
@@ -951,6 +1001,7 @@ const struct cmd_desc cmd_list[] = {
 	CMD(shutdown),
 	CMD(pinfile),
 	CMD(fallocate),
+	CMD(erase),
 	CMD(write),
 	CMD(read),
 	CMD(randread),
-- 
2.28.0.1011.ga647a8990f-goog