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Subject[PATCH] f2fs_io: add erase option
From
f2fs_io erase [block_device_path]

Signed-off-by: Ocean Chen <oceanchen@google.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
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