linux-ext4 - [PATCH v2 1/2] fs: hoist get/set UUID ioctls

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Date:   Fri, 18 Nov 2022 13:14:07 -0800
From:   Catherine Hoang <catherine.hoang@...cle.com>
To:     linux-xfs@...r.kernel.org
Cc:     linux-ext4@...r.kernel.org
Subject: [PATCH v2 1/2] fs: hoist get/set UUID ioctls

Hoist the EXT4_IOC_[GS]ETFSUUID ioctls so that they can be used by all
filesystems. This allows us to have a common interface for tools such as
coreutils.

Signed-off-by: Catherine Hoang <catherine.hoang@...cle.com>
Reviewed-by: Darrick J. Wong <djwong@...nel.org>
Reviewed-by: Allison Henderson <allison.henderson@...cle.com>
---
 fs/ext4/ext4.h          | 13 ++-----------
 include/uapi/linux/fs.h | 11 +++++++++++
 2 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 8d5453852f98..b200302a3732 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -722,8 +722,8 @@ enum {
 #define EXT4_IOC_GETSTATE		_IOW('f', 41, __u32)
 #define EXT4_IOC_GET_ES_CACHE		_IOWR('f', 42, struct fiemap)
 #define EXT4_IOC_CHECKPOINT		_IOW('f', 43, __u32)
-#define EXT4_IOC_GETFSUUID		_IOR('f', 44, struct fsuuid)
-#define EXT4_IOC_SETFSUUID		_IOW('f', 44, struct fsuuid)
+#define EXT4_IOC_GETFSUUID		FS_IOC_GETFSUUID
+#define EXT4_IOC_SETFSUUID		FS_IOC_SETFSUUID
 
 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 
@@ -753,15 +753,6 @@ enum {
 						EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \
 						EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
 
-/*
- * Structure for EXT4_IOC_GETFSUUID/EXT4_IOC_SETFSUUID
- */
-struct fsuuid {
-	__u32       fsu_len;
-	__u32       fsu_flags;
-	__u8        fsu_uuid[];
-};
-
 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 /*
  * ioctl commands in 32 bit emulation
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index b7b56871029c..63b925444592 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -121,6 +121,15 @@ struct fsxattr {
 	unsigned char	fsx_pad[8];
 };
 
+/*
+ * Structure for FS_IOC_GETFSUUID/FS_IOC_SETFSUUID
+ */
+struct fsuuid {
+	__u32       fsu_len;
+	__u32       fsu_flags;
+	__u8        fsu_uuid[];
+};
+
 /*
  * Flags for the fsx_xflags field
  */
@@ -215,6 +224,8 @@ struct fsxattr {
 #define FS_IOC_FSSETXATTR		_IOW('X', 32, struct fsxattr)
 #define FS_IOC_GETFSLABEL		_IOR(0x94, 49, char[FSLABEL_MAX])
 #define FS_IOC_SETFSLABEL		_IOW(0x94, 50, char[FSLABEL_MAX])
+#define FS_IOC_GETFSUUID		_IOR('f', 44, struct fsuuid)
+#define FS_IOC_SETFSUUID		_IOW('f', 44, struct fsuuid)
 
 /*
  * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
-- 
2.25.1