f2fs: support f2fs's quota sysfile

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>

3 files changed, 20 insertions, 1 deletions

diff --git a/bylabel.c b/bylabel.c
index 68a109c..ff10422 100644
--- a/bylabel.c
+++ b/bylabel.c
@@ -65,6 +65,14 @@ struct reiserfs_super_block {
 	u_char s_volume_name[16];
 };
 
+#define F2FS_SUPER_MAGIC	"0xF2F52010"
+struct f2fs_super_block {
+	u_char s_magic[8];
+	u_char s_dummy[144];
+	u_char s_uuid[16];
+	u_char s_volume_name[512];
+};
+
 static inline unsigned short swapped(unsigned short a)
 {
 	return (a >> 8) | (a << 8);
@@ -81,6 +89,7 @@ static int get_label_uuid(const char *device, char **label, char *uuid)
 	struct ext2_super_block e2sb;
 	struct xfs_super_block xfsb;
 	struct reiserfs_super_block reisersb;
+	struct f2fs_super_block f2fssb;
 
 	fd = open(device, O_RDONLY);
 	if (fd < 0)
@@ -114,6 +123,15 @@ static int get_label_uuid(const char *device, char **label, char *uuid)
 		sstrncpy(*label, (char *)reisersb.s_volume_name, namesize);
 		rv = 0;
 	}
+	else if (lseek(fd, 65536, SEEK_SET) == 65536
+		&& read(fd, (char *)&f2fssb, sizeof(f2fssb)) == sizeof(f2fssb)
+		&& !strncmp((char *)&f2fssb.s_magic, F2FS_SUPER_MAGIC, 8)) {
+		memcpy(uuid, f2fssb.s_uuid, sizeof(f2fssb.s_uuid));
+		namesize = sizeof(f2fssb.s_volume_name);
+		*label = smalloc(namesize + 1);
+		sstrncpy(*label, (char *)f2fssb.s_volume_name, namesize);
+		rv = 0;
+	}
 	close(fd);
 	return rv;
 }
diff --git a/mntopt.h b/mntopt.h
index f31abb7..7913048 100644
--- a/mntopt.h
+++ b/mntopt.h
@@ -7,6 +7,7 @@
 #define MNTTYPE_EXT2		"ext2"	/* 2nd Extended file system */
 #define MNTTYPE_EXT3		"ext3"	/* ext2 + journaling */
 #define MNTTYPE_EXT4		"ext4"	/* ext4 filesystem */
+#define MNTTYPE_F2FS		"f2fs"	/* f2fs filesystem */
 #define MNTTYPE_NEXT3		"next3"	/* next3 filesystem */
 #define MNTTYPE_EXT4DEV		"ext4dev"/* ext4dev filesystem */
 #define MNTTYPE_MINIX		"minix"	/* MINIX file system */
diff --git a/quotasys.c b/quotasys.c
index fa28f6e..52938ac 100644
--- a/quotasys.c
+++ b/quotasys.c
@@ -769,7 +769,7 @@ static int hasquota(const char *dev, struct mntent *mnt, int type, int flags)
 	 * standard GETFMT quotactl because that does not distinguish between
 	 * quota in system file and quota in ordinary file.
 	 */
-	if (!strcmp(mnt->mnt_type, MNTTYPE_EXT4)) {
+	if (!strcmp(mnt->mnt_type, MNTTYPE_EXT4) || !strcmp(mnt->mnt_type, MNTTYPE_F2FS)) {
 		struct if_dqinfo kinfo;
 
 		if (quotactl(QCMD(Q_GETINFO, type), dev, 0, (void *)&kinfo) == 0) {