[PATCH] f2fs_io: add do_clearflags to clear nocompress/compress flag

[Qi Han]

To align f2fs_io functionality with chattr +/-c and +/-m, the
do_clearflags function has been added to clear the FS_COMPR_FL and
FS_NOCOMP_FL flags.

Signed-off-by: Qi Han <hanqi@xxxxxxxx>
---
 man/f2fs_io.8           |  4 ++++
 tools/f2fs_io/f2fs_io.c | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/man/f2fs_io.8 b/man/f2fs_io.8
index 450f1b7..4ffb28d 100644
--- a/man/f2fs_io.8
+++ b/man/f2fs_io.8
@@ -18,6 +18,10 @@ Get the flags associated with the specified file.
 Set an f2fs file on specified file.  The flag can be casefold,
 compression, and nocompression.
 .TP
+\fBclearflags\fR \fI[flag] [file]\fR
+Clear the specified flag on the target file, which can be compression
+and nocompression.
+.TP
 \fBshutdown\fR \fIshutdown filesystem\fR
 Freeze and stop all IOs for the file system mounted on
 .IR dir.
diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c
index 73ac700..a450bf1 100644
--- a/tools/f2fs_io/f2fs_io.c
+++ b/tools/f2fs_io/f2fs_io.c
@@ -330,6 +330,42 @@ static void do_setflags(int argc, char **argv, const struct cmd_desc *cmd)
 	exit(0);
 }
 
+#define clearflags_desc "clearflags ioctl"
+#define clearflags_help						\
+"f2fs_io clearflags [flag] [file]\n\n"				\
+"clear a flag given the file\n"					\
+"flag can be\n"							\
+"  compression\n"						\
+"  nocompression\n"						\
+
+static void do_clearflags(int argc, char **argv, const struct cmd_desc *cmd)
+{
+	long flag = 0;
+	int ret, fd;
+
+	if (argc != 3) {
+		fputs("Excess arguments\n\n", stderr);
+		fputs(cmd->cmd_help, stderr);
+		exit(1);
+	}
+
+	fd = xopen(argv[2], O_RDONLY, 0);
+
+	ret = ioctl(fd, F2FS_IOC_GETFLAGS, &flag);
+	printf("get a flag on %s ret=%d, flags=%lx\n", argv[1], ret, flag);
+	if (ret)
+		die_errno("F2FS_IOC_GETFLAGS failed");
+
+	if (!strcmp(argv[1], "compression"))
+		flag &= ~FS_COMPR_FL;
+	else if (!strcmp(argv[1], "nocompression"))
+		flag &= ~FS_NOCOMP_FL;
+
+	ret = ioctl(fd, F2FS_IOC_SETFLAGS, &flag);
+	printf("clear a flag on %s ret=%d, flags=%s\n", argv[2], ret, argv[1]);
+	exit(0);
+}
+
 #define shutdown_desc "shutdown filesystem"
 #define shutdown_help					\
 "f2fs_io shutdown [level] [dir]\n\n"			\
@@ -1464,6 +1500,7 @@ const struct cmd_desc cmd_list[] = {
 	CMD(set_verity),
 	CMD(getflags),
 	CMD(setflags),
+	CMD(clearflags),
 	CMD(shutdown),
 	CMD(pinfile),
 	CMD(fallocate),
-- 
2.39.0