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SubjectRe: [PATCH] f2fs: fix to keep backward compatibility of flexible inline xattr feature
Hi Chao,

It seems this is a critical problem, so let me integrate this patch with your
initial patch "f2fs: support flexible inline xattr size".
Let me know, if you have any other concern.

Thanks,

On 10/25, Chao Yu wrote:
> Previously, in inode layout, we will always reserve 200 bytes for inline
> xattr space no matter the inode enables inline xattr feature or not, due
> to this reason, max inline size of inode is fixed, but now, if inline
> xattr is not enabled, max inline size of inode will be enlarged by 200
> bytes, for regular and symlink inode, it will be safe to reuse resevered
> space as they are all zero, but for directory, we need to keep the
> reservation for stablizing directory structure.
>
> Reported-by: Sheng Yong <shengyong1@huawei.com>
> Signed-off-by: Chao Yu <yuchao0@huawei.com>
> ---
> fs/f2fs/f2fs.h | 5 +----
> fs/f2fs/inode.c | 15 ++++++++++++---
> fs/f2fs/namei.c | 2 ++
> 3 files changed, 15 insertions(+), 7 deletions(-)
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 2af1d31ae74b..7ddd0d085e3b 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -2393,10 +2393,7 @@ static inline int get_extra_isize(struct inode *inode)
> 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;
> }
>
> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
> index bb876737e653..7f31b22c9efa 100644
> --- a/fs/f2fs/inode.c
> +++ b/fs/f2fs/inode.c
> @@ -232,10 +232,19 @@ 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))
> + /*
> + * Previously, we will always reserve DEFAULT_INLINE_XATTR_ADDRS size
> + * space for inline xattr datas, if inline xattr is not enabled, we
> + * can expect all zero in reserved area, so for regular or symlink,
> + * it will be safe to reuse reserved area, but for directory, we
> + * should keep the reservation for stablizing directory structure.
> + */
> + if (f2fs_has_extra_attr(inode) &&
> + f2fs_sb_has_flexible_inline_xattr(sbi->sb))
> fi->i_inline_xattr_size = le16_to_cpu(ri->i_inline_xattr_size);
> + else if (!f2fs_has_inline_xattr(inode) &&
> + (S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)))
> + fi->i_inline_xattr_size = 0;
> else
> fi->i_inline_xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
>
> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> index e6f86d5d97b9..a1c56a14c191 100644
> --- a/fs/f2fs/namei.c
> +++ b/fs/f2fs/namei.c
> @@ -91,6 +91,8 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
> f2fs_sb_has_flexible_inline_xattr(sbi->sb) &&
> f2fs_has_inline_xattr(inode))
> F2FS_I(inode)->i_inline_xattr_size = sbi->inline_xattr_size;
> + else
> + F2FS_I(inode)->i_inline_xattr_size = 0;
>
> if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
> set_inode_flag(inode, FI_INLINE_DATA);
> --
> 2.13.1.388.g69e6b9b4f4a9

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