[f2fs-dev] [PATCH 2/2] f2fs_io: add ioprio command to give a io priority hint

[Jaegeuk Kim via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

This adds a command to call ioctl(F2FS_IOC_IO_PRIO).

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 tools/f2fs_io/f2fs_io.c | 35 +++++++++++++++++++++++++++++++++++
 tools/f2fs_io/f2fs_io.h |  7 +++++++
 2 files changed, 42 insertions(+)

diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c
index e7ad22e08ba5..c4a0a6c4cf85 100644
--- a/tools/f2fs_io/f2fs_io.c
+++ b/tools/f2fs_io/f2fs_io.c
@@ -485,6 +485,40 @@ static void do_fadvise(int argc, char **argv, const struct cmd_desc *cmd)
 	exit(0);
 }
 
+#define ioprio_desc "ioprio"
+#define ioprio_help						\
+"f2fs_io ioprio [hint] [file]\n\n"				\
+"ioprio given the file\n"					\
+"hint can be\n"							\
+" ioprio_write\n"						\
+
+static void do_ioprio(int argc, char **argv, const struct cmd_desc *cmd)
+{
+	int fd, hint;
+
+	if (argc != 3) {
+		fputs("Excess arguments\n\n", stderr);
+		fputs(cmd->cmd_help, stderr);
+		exit(1);
+	}
+
+	fd = xopen(argv[2], O_RDWR, 0);
+
+	if (!strcmp(argv[1], "ioprio_write")) {
+		hint = F2FS_IOPRIO_WRITE;
+	} else {
+		fputs("Not supported hint\n\n", stderr);
+		fputs(cmd->cmd_help, stderr);
+		exit(1);
+	}
+
+	if (ioctl(fd, F2FS_IOC_IO_PRIO, &hint) != 0)
+		die_errno("ioprio failed");
+
+	printf("ioprio_hint %d to a file: %s\n", hint, argv[2]);
+	exit(0);
+}
+
 #define pinfile_desc "pin file control"
 #define pinfile_help						\
 "f2fs_io pinfile [get|set|unset] [file]\n\n"			\
@@ -1941,6 +1975,7 @@ const struct cmd_desc cmd_list[] = {
 	CMD(removexattr),
 	CMD(lseek),
 	CMD(get_advise),
+	CMD(ioprio),
 	{ NULL, NULL, NULL, NULL, 0 }
 };
 
diff --git a/tools/f2fs_io/f2fs_io.h b/tools/f2fs_io/f2fs_io.h
index 14c9dc1fda46..f2d0a0827ca5 100644
--- a/tools/f2fs_io/f2fs_io.h
+++ b/tools/f2fs_io/f2fs_io.h
@@ -94,6 +94,8 @@ typedef u32	__be32;
 #define F2FS_IOC_DECOMPRESS_FILE        _IO(F2FS_IOCTL_MAGIC, 23)
 #define F2FS_IOC_COMPRESS_FILE          _IO(F2FS_IOCTL_MAGIC, 24)
 #define F2FS_IOC_START_ATOMIC_REPLACE	_IO(F2FS_IOCTL_MAGIC, 25)
+#define F2FS_IOC_GET_DEV_ALIAS_FILE	_IOR(F2FS_IOCTL_MAGIC, 26, __u32)
+#define F2FS_IOC_IO_PRIO		_IOW(F2FS_IOCTL_MAGIC, 28, __u32)
 
 #ifndef FSCRYPT_POLICY_V1
 #define FSCRYPT_POLICY_V1		0
@@ -193,6 +195,11 @@ struct fsverity_enable_arg {
 #define FADVISE_VERITY_BIT	0x40
 #define FADVISE_TRUNC_BIT	0x80
 
+/* used for F2FS_IOC_IO_PRIO */
+enum {
+	F2FS_IOPRIO_WRITE = 1,  /* high write priority */
+};
+
 #ifndef FS_IMMUTABLE_FL
 #define FS_IMMUTABLE_FL			0x00000010 /* Immutable file */
 #endif
-- 
2.48.1.601.g30ceb7b040-goog



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