f2fs: add quota_ino feature infra

This patch adds quota_ino feature infra to be used for quota files.
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/f2fs.h

@@ -122,6 +122,7 @@ struct f2fs_mount_info {
 #define F2FS_FEATURE_PRJQUOTA		0x0010
 #define F2FS_FEATURE_INODE_CHKSUM	0x0020
 #define F2FS_FEATURE_FLEXIBLE_INLINE_XATTR	0x0040
+#define F2FS_FEATURE_QUOTA_INO		0x0080
 
 #define F2FS_HAS_FEATURE(sb, mask)					\
 	((F2FS_SB(sb)->raw_super->feature & cpu_to_le32(mask)) != 0)
@@ -3070,6 +3071,11 @@ static inline int f2fs_sb_has_flexible_inline_xattr(struct super_block *sb)
 	return F2FS_HAS_FEATURE(sb, F2FS_FEATURE_FLEXIBLE_INLINE_XATTR);
 }
 
+static inline int f2fs_sb_has_quota_ino(struct super_block *sb)
+{
+	return F2FS_HAS_FEATURE(sb, F2FS_FEATURE_QUOTA_INO);
+}
+
 #ifdef CONFIG_BLK_DEV_ZONED
 static inline int get_blkz_type(struct f2fs_sb_info *sbi,
 			struct block_device *bdev, block_t blkaddr)

fs/f2fs/sysfs.c

@@ -110,6 +110,9 @@ static ssize_t features_show(struct f2fs_attr *a,
 	if (f2fs_sb_has_flexible_inline_xattr(sb))
 		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
 				len ? ", " : "", "flexible_inline_xattr");
+	if (f2fs_sb_has_quota_ino(sb))
+		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
+				len ? ", " : "", "quota_ino");
 	len += snprintf(buf + len, PAGE_SIZE - len, "\n");
 	return len;
 }
@@ -227,6 +230,7 @@ enum feat_id {
 	FEAT_PROJECT_QUOTA,
 	FEAT_INODE_CHECKSUM,
 	FEAT_FLEXIBLE_INLINE_XATTR,
+	FEAT_QUOTA_INO,
 };
 
 static ssize_t f2fs_feature_show(struct f2fs_attr *a,
@@ -240,6 +244,7 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
 	case FEAT_PROJECT_QUOTA:
 	case FEAT_INODE_CHECKSUM:
 	case FEAT_FLEXIBLE_INLINE_XATTR:
+	case FEAT_QUOTA_INO:
 		return snprintf(buf, PAGE_SIZE, "supported\n");
 	}
 	return 0;
@@ -314,6 +319,7 @@ F2FS_FEATURE_RO_ATTR(extra_attr, FEAT_EXTRA_ATTR);
 F2FS_FEATURE_RO_ATTR(project_quota, FEAT_PROJECT_QUOTA);
 F2FS_FEATURE_RO_ATTR(inode_checksum, FEAT_INODE_CHECKSUM);
 F2FS_FEATURE_RO_ATTR(flexible_inline_xattr, FEAT_FLEXIBLE_INLINE_XATTR);
+F2FS_FEATURE_RO_ATTR(quota_ino, FEAT_QUOTA_INO);
 
 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 static struct attribute *f2fs_attrs[] = {
@@ -364,6 +370,7 @@ static struct attribute *f2fs_feat_attrs[] = {
 	ATTR_LIST(project_quota),
 	ATTR_LIST(inode_checksum),
 	ATTR_LIST(flexible_inline_xattr),
+	ATTR_LIST(quota_ino),
 	NULL,
 };
 

include/linux/f2fs_fs.h

@@ -36,6 +36,9 @@
 #define F2FS_NODE_INO(sbi)	((sbi)->node_ino_num)
 #define F2FS_META_INO(sbi)	((sbi)->meta_ino_num)
 
+#define F2FS_QUOTA_INO		3
+#define F2FS_MAX_QUOTAS		3
+
 #define F2FS_IO_SIZE(sbi)	(1 << (sbi)->write_io_size_bits) /* Blocks */
 #define F2FS_IO_SIZE_KB(sbi)	(1 << ((sbi)->write_io_size_bits + 2)) /* KB */
 #define F2FS_IO_SIZE_BYTES(sbi)	(1 << ((sbi)->write_io_size_bits + 12)) /* B */
@@ -108,7 +111,8 @@ struct f2fs_super_block {
 	__u8 encryption_level;		/* versioning level for encryption */
 	__u8 encrypt_pw_salt[16];	/* Salt used for string2key algorithm */
 	struct f2fs_device devs[MAX_DEVICES];	/* device list */
-	__u8 reserved[327];		/* valid reserved region */
+	__le32 qf_ino[F2FS_MAX_QUOTAS];	/* quota inode numbers */
+	__u8 reserved[315];		/* valid reserved region */
 } __packed;
 
 /*