[f2fs-dev] [PATCH] f2fs_io: support triggering filesystem GC via ioctl

[Chao Yu <chao@kernel.org>]

From: Chao Yu <chao.yu@oppo.com>

Support 'gc' sub command to trigger filesystem GC via ioctl in f2fs.

Signed-off-by: Chao Yu <chao.yu@oppo.com>
---
 man/f2fs_io.8           |  3 +++
 tools/f2fs_io/f2fs_io.c | 28 ++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/man/f2fs_io.8 b/man/f2fs_io.8
index af7325a..33789c2 100644
--- a/man/f2fs_io.8
+++ b/man/f2fs_io.8
@@ -132,6 +132,9 @@ Release compressed blocks to get free space.
 .TP
 \fBreserve_cblocks\fR \fI[file]\fR
 Reserve free blocks to prepare decompressing blocks in the file.
+.TP
+\fBgc\fR \fI[sync_mode] [file]\fR
+Trigger filesystem GC
 .SH AUTHOR
 This version of
 .B f2fs_io
diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c
index e735983..5be7b9e 100644
--- a/tools/f2fs_io/f2fs_io.c
+++ b/tools/f2fs_io/f2fs_io.c
@@ -1270,6 +1270,33 @@ static void do_rename(int argc, char **argv, const struct cmd_desc *cmd)
 	exit(0);
 }
 
+#define gc_desc "trigger filesystem GC"
+#define gc_help "f2fs_io gc sync_mode [file_path]\n\n"
+
+static void do_gc(int argc, char **argv, const struct cmd_desc *cmd)
+{
+	u32 sync;
+	int ret, fd;
+
+	if (argc != 3) {
+		fputs("Excess arguments\n\n", stderr);
+		fputs(cmd->cmd_help, stderr);
+		exit(1);
+	}
+
+	sync = atoi(argv[1]);
+
+	fd = xopen(argv[2], O_RDONLY, 0);
+
+	ret = ioctl(fd, F2FS_IOC_GARBAGE_COLLECT, &sync);
+	if (ret < 0)
+		die_errno("F2FS_IOC_GARBAGE_COLLECT failed");
+
+	printf("trigger %s gc ret=%d\n",
+		sync ? "synchronous" : "asynchronous", ret);
+	exit(0);
+}
+
 #define CMD_HIDDEN 	0x0001
 #define CMD(name) { #name, do_##name, name##_desc, name##_help, 0 }
 #define _CMD(name) { #name, do_##name, NULL, NULL, CMD_HIDDEN }
@@ -1301,6 +1328,7 @@ const struct cmd_desc cmd_list[] = {
 	CMD(compress),
 	CMD(get_filename_encrypt_mode),
 	CMD(rename),
+	CMD(gc),
 	{ NULL, NULL, NULL, NULL, 0 }
 };
 
-- 
2.25.1



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