Re: [PATCH 3/3] f2fs: support flexible inline xattr size

[Chao Yu]

On 2017/9/7 12:48, Jaegeuk Kim wrote:
> On 09/06, Chao Yu wrote:
>> Hi Jaegeuk,
>>
>> Do we have time to test and stabilize this new feature before merge window?
> 
> Let's try this in the next merge window. It's too tight to test now. :)

OK, :)

Thanks,

> 
>>
>> Thanks,
>>
>> On 2017/9/4 18:58, Chao Yu wrote:
>>> Now, in product, more and more features based on file encryption were
>>> introduced, their demand of xattr space is increasing, however, inline
>>> xattr has fixed-size of 200 bytes, once inline xattr space is full, new
>>> increased xattr data would occupy additional xattr block which may bring
>>> us more space usage and performance regression during persisting.
>>>
>>> In order to resolve above issue, it's better to expand inline xattr size
>>> flexibly according to user's requirement.
>>>
>>> So this patch introduces new filesystem feature 'flexible inline xattr',
>>> and new mount option 'inline_xattr_size=%u', once mkfs enables the
>>> feature, we can use the option to make f2fs supporting flexible inline
>>> xattr size.
>>>
>>> To support this feature, we add extra attribute i_inline_xattr_size in
>>> inode layout, indicating that how many space inline xattr borrows from
>>> block address mapping space in inode layout, by this, we can easily
>>> locate and store flexible-sized inline xattr data in inode.
>>>
>>> Inode disk layout:
>>>   +----------------------+
>>>   | .i_mode              |
>>>   | ...                  |
>>>   | .i_ext               |
>>>   +----------------------+
>>>   | .i_extra_isize       |
>>>   | .i_inline_xattr_size |-----------+
>>>   | ...                  |           |
>>>   +----------------------+           |
>>>   | .i_addr              |           |
>>>   |  - block address or  |           |
>>>   |  - inline data       |           |
>>>   +----------------------+<---+      v
>>>   |    inline xattr      |    +---inline xattr range
>>>   +----------------------+<---+
>>>   | .i_nid               |
>>>   +----------------------+
>>>   |   node_footer        |
>>>   | (nid, ino, offset)   |
>>>   +----------------------+
>>>
>>> Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
>>> ---
>>>  fs/f2fs/f2fs.h          | 43 ++++++++++++++++++++++++++++++-------------
>>>  fs/f2fs/inode.c         | 12 ++++++++++++
>>>  fs/f2fs/namei.c         |  6 ++++++
>>>  fs/f2fs/node.c          |  4 ++--
>>>  fs/f2fs/super.c         | 32 +++++++++++++++++++++++++++++++-
>>>  fs/f2fs/sysfs.c         |  7 +++++++
>>>  fs/f2fs/xattr.c         | 18 +++++++++---------
>>>  include/linux/f2fs_fs.h |  5 +++--
>>>  8 files changed, 100 insertions(+), 27 deletions(-)
>>>
>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>>> index 1f24ad4ca1bb..168ad51b7fb9 100644
>>> --- a/fs/f2fs/f2fs.h
>>> +++ b/fs/f2fs/f2fs.h
>>> @@ -93,6 +93,7 @@ extern char *fault_name[FAULT_MAX];
>>>  #define F2FS_MOUNT_GRPQUOTA		0x00100000
>>>  #define F2FS_MOUNT_PRJQUOTA		0x00200000
>>>  #define F2FS_MOUNT_QUOTA		0x00400000
>>> +#define F2FS_MOUNT_INLINE_XATTR_SIZE	0x00800000
>>>  
>>>  #define clear_opt(sbi, option)	((sbi)->mount_opt.opt &= ~F2FS_MOUNT_##option)
>>>  #define set_opt(sbi, option)	((sbi)->mount_opt.opt |= F2FS_MOUNT_##option)
>>> @@ -118,6 +119,7 @@ struct f2fs_mount_info {
>>>  #define F2FS_FEATURE_EXTRA_ATTR		0x0008
>>>  #define F2FS_FEATURE_PRJQUOTA		0x0010
>>>  #define F2FS_FEATURE_INODE_CHKSUM	0x0020
>>> +#define F2FS_FEATURE_FLEXIBLE_INLINE_XATTR	0x0040
>>>  
>>>  #define F2FS_HAS_FEATURE(sb, mask)					\
>>>  	((F2FS_SB(sb)->raw_super->feature & cpu_to_le32(mask)) != 0)
>>> @@ -379,11 +381,14 @@ struct f2fs_flush_device {
>>>  
>>>  /* for inline stuff */
>>>  #define DEF_INLINE_RESERVED_SIZE	1
>>> +#define DEF_MIN_INLINE_SIZE		1
>>>  static inline int get_extra_isize(struct inode *inode);
>>> -#define MAX_INLINE_DATA(inode)	(sizeof(__le32) * \
>>> -				(CUR_ADDRS_PER_INODE(inode) - \
>>> -				DEF_INLINE_RESERVED_SIZE - \
>>> -				F2FS_INLINE_XATTR_ADDRS))
>>> +static inline int get_inline_xattr_addrs(struct inode *inode);
>>> +#define F2FS_INLINE_XATTR_ADDRS(inode)	get_inline_xattr_addrs(inode)
>>> +#define MAX_INLINE_DATA(inode)	(sizeof(__le32) *			\
>>> +				(CUR_ADDRS_PER_INODE(inode) -		\
>>> +				F2FS_INLINE_XATTR_ADDRS(inode) -	\
>>> +				DEF_INLINE_RESERVED_SIZE))
>>>  
>>>  /* for inline dir */
>>>  #define NR_INLINE_DENTRY(inode)	(MAX_INLINE_DATA(inode) * BITS_PER_BYTE / \
>>> @@ -592,6 +597,7 @@ struct f2fs_inode_info {
>>>  
>>>  	int i_extra_isize;		/* size of extra space located in i_addr */
>>>  	kprojid_t i_projid;		/* id for project quota */
>>> +	int i_inline_xattr_size;	/* inline xattr size */
>>>  };
>>>  
>>>  static inline void get_extent_info(struct extent_info *ext,
>>> @@ -1043,6 +1049,7 @@ struct f2fs_sb_info {
>>>  	loff_t max_file_blocks;			/* max block index of file */
>>>  	int active_logs;			/* # of active logs */
>>>  	int dir_level;				/* directory level */
>>> +	int inline_xattr_size;			/* inline xattr size */
>>>  
>>>  	block_t user_block_count;		/* # of user blocks */
>>>  	block_t total_valid_block_count;	/* # of valid blocks */
>>> @@ -2167,25 +2174,20 @@ static inline int f2fs_has_inline_xattr(struct inode *inode)
>>>  
>>>  static inline unsigned int addrs_per_inode(struct inode *inode)
>>>  {
>>> -	if (f2fs_has_inline_xattr(inode))
>>> -		return CUR_ADDRS_PER_INODE(inode) - F2FS_INLINE_XATTR_ADDRS;
>>> -	return CUR_ADDRS_PER_INODE(inode);
>>> +	return CUR_ADDRS_PER_INODE(inode) - F2FS_INLINE_XATTR_ADDRS(inode);
>>>  }
>>>  
>>> -static inline void *inline_xattr_addr(struct page *page)
>>> +static inline void *inline_xattr_addr(struct inode *inode, struct page *page)
>>>  {
>>>  	struct f2fs_inode *ri = F2FS_INODE(page);
>>>  
>>>  	return (void *)&(ri->i_addr[DEF_ADDRS_PER_INODE -
>>> -					F2FS_INLINE_XATTR_ADDRS]);
>>> +					F2FS_INLINE_XATTR_ADDRS(inode)]);
>>>  }
>>>  
>>>  static inline int inline_xattr_size(struct inode *inode)
>>>  {
>>> -	if (f2fs_has_inline_xattr(inode))
>>> -		return F2FS_INLINE_XATTR_ADDRS << 2;
>>> -	else
>>> -		return 0;
>>> +	return get_inline_xattr_addrs(inode) * sizeof(__le32);
>>>  }
>>>  
>>>  static inline int f2fs_has_inline_data(struct inode *inode)
>>> @@ -2329,6 +2331,16 @@ static inline int get_extra_isize(struct inode *inode)
>>>  	return F2FS_I(inode)->i_extra_isize / sizeof(__le32);
>>>  }
>>>  
>>> +static inline int f2fs_sb_has_flexible_inline_xattr(struct super_block *sb);
>>> +static inline int get_inline_xattr_addrs(struct inode *inode)
>>> +{
>>> +	if (!f2fs_has_inline_xattr(inode))
>>> +		return 0;
>>> +	if (!f2fs_sb_has_flexible_inline_xattr(F2FS_I_SB(inode)->sb))
>>> +		return DEFAULT_INLINE_XATTR_ADDRS;
>>> +	return F2FS_I(inode)->i_inline_xattr_size;
>>> +}
>>> +
>>>  #define get_inode_mode(i) \
>>>  	((is_inode_flag_set(i, FI_ACL_MODE)) ? \
>>>  	 (F2FS_I(i)->i_acl_mode) : ((i)->i_mode))
>>> @@ -2984,6 +2996,11 @@ static inline int f2fs_sb_has_inode_chksum(struct super_block *sb)
>>>  	return F2FS_HAS_FEATURE(sb, F2FS_FEATURE_INODE_CHKSUM);
>>>  }
>>>  
>>> +static inline int f2fs_sb_has_flexible_inline_xattr(struct super_block *sb)
>>> +{
>>> +	return F2FS_HAS_FEATURE(sb, F2FS_FEATURE_FLEXIBLE_INLINE_XATTR);
>>> +}
>>> +
>>>  #ifdef CONFIG_BLK_DEV_ZONED
>>>  static inline int get_blkz_type(struct f2fs_sb_info *sbi,
>>>  			struct block_device *bdev, block_t blkaddr)
>>> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
>>> index c33b05aec1a1..c3e60fa60957 100644
>>> --- a/fs/f2fs/inode.c
>>> +++ b/fs/f2fs/inode.c
>>> @@ -232,6 +232,13 @@ static int do_read_inode(struct inode *inode)
>>>  	fi->i_extra_isize = f2fs_has_extra_attr(inode) ?
>>>  					le16_to_cpu(ri->i_extra_isize) : 0;
>>>  
>>> +	if (!f2fs_has_inline_xattr(inode))
>>> +		fi->i_inline_xattr_size = 0;
>>> +	else if (f2fs_sb_has_flexible_inline_xattr(sbi->sb))
>>> +		fi->i_inline_xattr_size = le16_to_cpu(ri->i_inline_xattr_size);
>>> +	else
>>> +		fi->i_inline_xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
>>> +
>>>  	/* check data exist */
>>>  	if (f2fs_has_inline_data(inode) && !f2fs_exist_data(inode))
>>>  		__recover_inline_status(inode, node_page);
>>> @@ -384,6 +391,11 @@ int update_inode(struct inode *inode, struct page *node_page)
>>>  	if (f2fs_has_extra_attr(inode)) {
>>>  		ri->i_extra_isize = cpu_to_le16(F2FS_I(inode)->i_extra_isize);
>>>  
>>> +		if (f2fs_sb_has_flexible_inline_xattr(F2FS_I_SB(inode)->sb) &&
>>> +			f2fs_has_inline_xattr(inode))
>>> +			ri->i_inline_xattr_size =
>>> +				cpu_to_le16(F2FS_I(inode)->i_inline_xattr_size);
>>> +
>>>  		if (f2fs_sb_has_project_quota(F2FS_I_SB(inode)->sb) &&
>>>  			F2FS_FITS_IN_INODE(ri, F2FS_I(inode)->i_extra_isize,
>>>  								i_projid)) {
>>> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
>>> index a4dab98c4b7b..b6455b7ca00f 100644
>>> --- a/fs/f2fs/namei.c
>>> +++ b/fs/f2fs/namei.c
>>> @@ -86,6 +86,12 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
>>>  
>>>  	if (test_opt(sbi, INLINE_XATTR))
>>>  		set_inode_flag(inode, FI_INLINE_XATTR);
>>> +
>>> +	if (f2fs_sb_has_extra_attr(sbi->sb) &&
>>> +		f2fs_sb_has_flexible_inline_xattr(sbi->sb) &&
>>> +		f2fs_has_inline_xattr(inode))
>>> +		F2FS_I(inode)->i_inline_xattr_size = sbi->inline_xattr_size;
>>> +
>>>  	if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
>>>  		set_inode_flag(inode, FI_INLINE_DATA);
>>>  	if (f2fs_may_inline_dentry(inode))
>>> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
>>> index fca87835a1da..a19f3302c967 100644
>>> --- a/fs/f2fs/node.c
>>> +++ b/fs/f2fs/node.c
>>> @@ -2193,8 +2193,8 @@ void recover_inline_xattr(struct inode *inode, struct page *page)
>>>  		goto update_inode;
>>>  	}
>>>  
>>> -	dst_addr = inline_xattr_addr(ipage);
>>> -	src_addr = inline_xattr_addr(page);
>>> +	dst_addr = inline_xattr_addr(inode, ipage);
>>> +	src_addr = inline_xattr_addr(inode, page);
>>>  	inline_size = inline_xattr_size(inode);
>>>  
>>>  	f2fs_wait_on_page_writeback(ipage, NODE, true);
>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>>> index a8ff16c50b4c..3298bb3bf417 100644
>>> --- a/fs/f2fs/super.c
>>> +++ b/fs/f2fs/super.c
>>> @@ -92,6 +92,7 @@ enum {
>>>  	Opt_disable_ext_identify,
>>>  	Opt_inline_xattr,
>>>  	Opt_noinline_xattr,
>>> +	Opt_inline_xattr_size,
>>>  	Opt_inline_data,
>>>  	Opt_inline_dentry,
>>>  	Opt_noinline_dentry,
>>> @@ -141,6 +142,7 @@ static match_table_t f2fs_tokens = {
>>>  	{Opt_disable_ext_identify, "disable_ext_identify"},
>>>  	{Opt_inline_xattr, "inline_xattr"},
>>>  	{Opt_noinline_xattr, "noinline_xattr"},
>>> +	{Opt_inline_xattr_size, "inline_xattr_size=%u"},
>>>  	{Opt_inline_data, "inline_data"},
>>>  	{Opt_inline_dentry, "inline_dentry"},
>>>  	{Opt_noinline_dentry, "noinline_dentry"},
>>> @@ -383,6 +385,12 @@ static int parse_options(struct super_block *sb, char *options)
>>>  		case Opt_noinline_xattr:
>>>  			clear_opt(sbi, INLINE_XATTR);
>>>  			break;
>>> +		case Opt_inline_xattr_size:
>>> +			if (args->from && match_int(args, &arg))
>>> +				return -EINVAL;
>>> +			set_opt(sbi, INLINE_XATTR_SIZE);
>>> +			sbi->inline_xattr_size = arg;
>>> +			break;
>>>  #else
>>>  		case Opt_user_xattr:
>>>  			f2fs_msg(sb, KERN_INFO,
>>> @@ -604,6 +612,24 @@ static int parse_options(struct super_block *sb, char *options)
>>>  				F2FS_IO_SIZE_KB(sbi));
>>>  		return -EINVAL;
>>>  	}
>>> +
>>> +	if (test_opt(sbi, INLINE_XATTR_SIZE)) {
>>> +		if (!test_opt(sbi, INLINE_XATTR)) {
>>> +			f2fs_msg(sb, KERN_ERR,
>>> +					"inline_xattr_size option should be "
>>> +					"set with inline_xattr option");
>>> +			return -EINVAL;
>>> +		}
>>> +		if (!sbi->inline_xattr_size ||
>>> +			sbi->inline_xattr_size >= DEF_ADDRS_PER_INODE -
>>> +					F2FS_TOTAL_EXTRA_ATTR_SIZE -
>>> +					DEF_INLINE_RESERVED_SIZE -
>>> +					DEF_MIN_INLINE_SIZE) {
>>> +			f2fs_msg(sb, KERN_ERR,
>>> +					"inline xattr size is out of range");
>>> +			return -EINVAL;
>>> +		}
>>> +	}
>>>  	return 0;
>>>  }
>>>  
>>> @@ -1045,6 +1071,9 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
>>>  		seq_puts(seq, ",inline_xattr");
>>>  	else
>>>  		seq_puts(seq, ",noinline_xattr");
>>> +	if (test_opt(sbi, INLINE_XATTR_SIZE))
>>> +		seq_printf(seq, ",inline_xattr_size=%u",
>>> +					sbi->inline_xattr_size);
>>>  #endif
>>>  #ifdef CONFIG_F2FS_FS_POSIX_ACL
>>>  	if (test_opt(sbi, POSIX_ACL))
>>> @@ -1107,6 +1136,7 @@ static void default_options(struct f2fs_sb_info *sbi)
>>>  {
>>>  	/* init some FS parameters */
>>>  	sbi->active_logs = NR_CURSEG_TYPE;
>>> +	sbi->inline_xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
>>>  
>>>  	set_opt(sbi, BG_GC);
>>>  	set_opt(sbi, INLINE_XATTR);
>>> @@ -1655,7 +1685,7 @@ static loff_t max_file_blocks(void)
>>>  
>>>  	/*
>>>  	 * note: previously, result is equal to (DEF_ADDRS_PER_INODE -
>>> -	 * F2FS_INLINE_XATTR_ADDRS), but now f2fs try to reserve more
>>> +	 * DEFAULT_INLINE_XATTR_ADDRS), but now f2fs try to reserve more
>>>  	 * space in inode.i_addr, it will be more safe to reassign
>>>  	 * result as zero.
>>>  	 */
>>> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
>>> index daa48257cc94..595b69862b0e 100644
>>> --- a/fs/f2fs/sysfs.c
>>> +++ b/fs/f2fs/sysfs.c
>>> @@ -100,6 +100,9 @@ static ssize_t features_show(struct f2fs_attr *a,
>>>  	if (f2fs_sb_has_inode_chksum(sb))
>>>  		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
>>>  				len ? ", " : "", "inode_checksum");
>>> +	if (f2fs_sb_has_flexible_inline_xattr(sb))
>>> +		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
>>> +				len ? ", " : "", "flexible_inline_xattr");
>>>  	len += snprintf(buf + len, PAGE_SIZE - len, "\n");
>>>  	return len;
>>>  }
>>> @@ -232,6 +235,7 @@ enum feat_id {
>>>  	FEAT_EXTRA_ATTR,
>>>  	FEAT_PROJECT_QUOTA,
>>>  	FEAT_INODE_CHECKSUM,
>>> +	FEAT_FLEXIBLE_INLINE_XATTR,
>>>  };
>>>  
>>>  static ssize_t f2fs_feature_show(struct f2fs_attr *a,
>>> @@ -244,6 +248,7 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
>>>  	case FEAT_EXTRA_ATTR:
>>>  	case FEAT_PROJECT_QUOTA:
>>>  	case FEAT_INODE_CHECKSUM:
>>> +	case FEAT_FLEXIBLE_INLINE_XATTR:
>>>  		return snprintf(buf, PAGE_SIZE, "supported\n");
>>>  	}
>>>  	return 0;
>>> @@ -314,6 +319,7 @@ F2FS_FEATURE_RO_ATTR(atomic_write, FEAT_ATOMIC_WRITE);
>>>  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);
>>>  
>>>  #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
>>>  static struct attribute *f2fs_attrs[] = {
>>> @@ -360,6 +366,7 @@ static struct attribute *f2fs_feat_attrs[] = {
>>>  	ATTR_LIST(extra_attr),
>>>  	ATTR_LIST(project_quota),
>>>  	ATTR_LIST(inode_checksum),
>>> +	ATTR_LIST(flexible_inline_xattr),
>>>  	NULL,
>>>  };
>>>  
>>> diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
>>> index 4829f1b38478..252adbb7126a 100644
>>> --- a/fs/f2fs/xattr.c
>>> +++ b/fs/f2fs/xattr.c
>>> @@ -217,12 +217,12 @@ static struct f2fs_xattr_entry *__find_xattr(void *base_addr, int index,
>>>  	return entry;
>>>  }
>>>  
>>> -static struct f2fs_xattr_entry *__find_inline_xattr(void *base_addr,
>>> -					void **last_addr, int index,
>>> -					size_t len, const char *name)
>>> +static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode,
>>> +				void *base_addr, void **last_addr, int index,
>>> +				size_t len, const char *name)
>>>  {
>>>  	struct f2fs_xattr_entry *entry;
>>> -	unsigned int inline_size = F2FS_INLINE_XATTR_ADDRS << 2;
>>> +	unsigned int inline_size = inline_xattr_size(inode);
>>>  
>>>  	list_for_each_xattr(entry, base_addr) {
>>>  		if ((void *)entry + sizeof(__u32) > base_addr + inline_size ||
>>> @@ -250,13 +250,13 @@ static int read_inline_xattr(struct inode *inode, struct page *ipage,
>>>  	void *inline_addr;
>>>  
>>>  	if (ipage) {
>>> -		inline_addr = inline_xattr_addr(ipage);
>>> +		inline_addr = inline_xattr_addr(inode, ipage);
>>>  	} else {
>>>  		page = get_node_page(sbi, inode->i_ino);
>>>  		if (IS_ERR(page))
>>>  			return PTR_ERR(page);
>>>  
>>> -		inline_addr = inline_xattr_addr(page);
>>> +		inline_addr = inline_xattr_addr(inode, page);
>>>  	}
>>>  	memcpy(txattr_addr, inline_addr, inline_size);
>>>  	f2fs_put_page(page, 1);
>>> @@ -309,7 +309,7 @@ static int lookup_all_xattrs(struct inode *inode, struct page *ipage,
>>>  		if (err)
>>>  			goto out;
>>>  
>>> -		*xe = __find_inline_xattr(txattr_addr, &last_addr,
>>> +		*xe = __find_inline_xattr(inode, txattr_addr, &last_addr,
>>>  						index, len, name);
>>>  		if (*xe)
>>>  			goto check;
>>> @@ -404,7 +404,7 @@ static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
>>>  		void *inline_addr;
>>>  
>>>  		if (ipage) {
>>> -			inline_addr = inline_xattr_addr(ipage);
>>> +			inline_addr = inline_xattr_addr(inode, ipage);
>>>  			f2fs_wait_on_page_writeback(ipage, NODE, true);
>>>  			set_page_dirty(ipage);
>>>  		} else {
>>> @@ -413,7 +413,7 @@ static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
>>>  				alloc_nid_failed(sbi, new_nid);
>>>  				return PTR_ERR(page);
>>>  			}
>>> -			inline_addr = inline_xattr_addr(page);
>>> +			inline_addr = inline_xattr_addr(inode, page);
>>>  			f2fs_wait_on_page_writeback(page, NODE, true);
>>>  		}
>>>  		memcpy(inline_addr, txattr_addr, inline_size);
>>> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
>>> index 2a0c453d7235..50a8ee501bf1 100644
>>> --- a/include/linux/f2fs_fs.h
>>> +++ b/include/linux/f2fs_fs.h
>>> @@ -184,7 +184,8 @@ struct f2fs_extent {
>>>  } __packed;
>>>  
>>>  #define F2FS_NAME_LEN		255
>>> -#define F2FS_INLINE_XATTR_ADDRS	50	/* 200 bytes for inline xattrs */
>>> +/* 200 bytes for inline xattrs by default */
>>> +#define DEFAULT_INLINE_XATTR_ADDRS	50
>>>  #define DEF_ADDRS_PER_INODE	923	/* Address Pointers in an Inode */
>>>  #define CUR_ADDRS_PER_INODE(inode)	(DEF_ADDRS_PER_INODE - \
>>>  					get_extra_isize(inode))
>>> @@ -238,7 +239,7 @@ struct f2fs_inode {
>>>  	union {
>>>  		struct {
>>>  			__le16 i_extra_isize;	/* extra inode attribute size */
>>> -			__le16 i_padding;	/* padding */
>>> +			__le16 i_inline_xattr_size;	/* inline xattr size, unit: 4 bytes */
>>>  			__le32 i_projid;	/* project id */
>>>  			__le32 i_inode_checksum;/* inode meta checksum */
>>>  			__le32 i_extra_end[0];	/* for attribute size calculation */
>>>
> 
> .
>