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From:   Daeho Jeong <daeho43@gmail.com>
To:     linux-kernel@vger.kernel.org,
        linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com
Cc:     Daeho Jeong <daehojeong@google.com>
Subject: [PATCH v2] f2fs_io: add get/set compression option
Date:   Wed,  4 Nov 2020 08:36:14 +0900
Message-Id: <20201103233614.2092498-1-daeho43@gmail.com>
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From: Daeho Jeong <daehojeong@google.com>

Added new commands, get_coption and set_coption, to support
F2FS_IOC_GET_COMPRESS_OPTION and F2FS_IOC_SET_COMPRESS_OPTION.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
---

v2: changed the file open option of set_coption to write only.
---
 tools/f2fs_io/f2fs_io.c | 61 +++++++++++++++++++++++++++++++++++++++++
 tools/f2fs_io/f2fs_io.h |  9 ++++++
 2 files changed, 70 insertions(+)

diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c
index 5a2d06e..7e6cfd8 100644
--- a/tools/f2fs_io/f2fs_io.c
+++ b/tools/f2fs_io/f2fs_io.c
@@ -905,6 +905,65 @@ static void do_reserve_cblocks(int argc, char **argv, const struct cmd_desc *cmd
 	exit(0);
 }
 
+#define get_coption_desc "get compression option of a compressed file"
+#define get_coption_help						\
+"f2fs_io get_coption [file]\n\n"	\
+"  algorithm        : compression algorithm (0:lzo, 1: lz4, 2:zstd, 3:lzorle)\n"	\
+"  log_cluster_size : compression cluster log size (2 <= log_size <= 8)\n"
+
+static void do_get_coption(int argc, char **argv, const struct cmd_desc *cmd)
+{
+	struct f2fs_comp_option option;
+	int ret, fd;
+
+	if (argc != 2) {
+		fputs("Excess arguments\n\n", stderr);
+		fputs(cmd->cmd_help, stderr);
+		exit(1);
+	}
+
+	fd = xopen(argv[1], O_RDONLY, 0);
+
+	ret = ioctl(fd, F2FS_IOC_GET_COMPRESS_OPTION, &option);
+	if (ret < 0)
+		die_errno("F2FS_IOC_GET_COMPRESS_OPTION failed");
+
+	printf("compression algorithm:%u\n", option.algorithm);
+	printf("compression cluster log size:%u\n", option.log_cluster_size);
+
+	exit(0);
+}
+
+#define set_coption_desc "set compression option of a compressed file"
+#define set_coption_help						\
+"f2fs_io set_coption [algorithm] [log_cluster_size] [file_path]\n\n"	\
+"  algorithm        : compression algorithm (0:lzo, 1: lz4, 2:zstd, 3:lzorle)\n"	\
+"  log_cluster_size : compression cluster log size (2 <= log_size <= 8)\n"
+
+static void do_set_coption(int argc, char **argv, const struct cmd_desc *cmd)
+{
+	struct f2fs_comp_option option;
+	int fd, ret;
+
+	if (argc != 4) {
+		fputs("Excess arguments\n\n", stderr);
+		fputs(cmd->cmd_help, stderr);
+		exit(1);
+	}
+
+	option.algorithm = atoi(argv[1]);
+	option.log_cluster_size = atoi(argv[2]);
+
+	fd = xopen(argv[3], O_WRONLY, 0);
+
+	ret = ioctl(fd, F2FS_IOC_SET_COMPRESS_OPTION, &option);
+	if (ret < 0)
+		die_errno("F2FS_IOC_SET_COMPRESS_OPTION failed");
+
+	printf("set compression option: algorithm=%u, log_cluster_size=%u\n",
+			option.algorithm, option.log_cluster_size);
+	exit(0);
+}
 
 #define CMD_HIDDEN 	0x0001
 #define CMD(name) { #name, do_##name, name##_desc, name##_help, 0 }
@@ -930,6 +989,8 @@ const struct cmd_desc cmd_list[] = {
 	CMD(get_cblocks),
 	CMD(release_cblocks),
 	CMD(reserve_cblocks),
+	CMD(get_coption),
+	CMD(set_coption),
 	{ NULL, NULL, NULL, NULL, 0 }
 };
 
diff --git a/tools/f2fs_io/f2fs_io.h b/tools/f2fs_io/f2fs_io.h
index 05d4cfe..cb56e8c 100644
--- a/tools/f2fs_io/f2fs_io.h
+++ b/tools/f2fs_io/f2fs_io.h
@@ -84,6 +84,10 @@ typedef u32	__be32;
 					_IOR(F2FS_IOCTL_MAGIC, 18, __u64)
 #define F2FS_IOC_RESERVE_COMPRESS_BLOCKS				\
 					_IOR(F2FS_IOCTL_MAGIC, 19, __u64)
+#define F2FS_IOC_GET_COMPRESS_OPTION    _IOR(F2FS_IOCTL_MAGIC, 21,      \
+						struct f2fs_comp_option)
+#define F2FS_IOC_SET_COMPRESS_OPTION    _IOW(F2FS_IOCTL_MAGIC, 22,      \
+						struct f2fs_comp_option)
 
 #define F2FS_IOC_SET_ENCRYPTION_POLICY	FS_IOC_SET_ENCRYPTION_POLICY
 #define F2FS_IOC_GET_ENCRYPTION_POLICY	FS_IOC_GET_ENCRYPTION_POLICY
@@ -164,3 +168,8 @@ struct f2fs_flush_device {
 	u32 dev_num;		/* device number to flush */
 	u32 segments;		/* # of segments to flush */
 };
+
+struct f2fs_comp_option {
+	u8 algorithm;
+	u8 log_cluster_size;
+};
-- 
2.29.1.341.ge80a0c044ae-goog