I guess Maintainer will reply you when development cycle is ready for this.
Please be patient Miao!, let's play Glory of the king.^^^_^^^
________________________________________
From: Miao Xie [miaoxie@xxxxxxxxxx]
Sent: Thursday, July 13, 2017 20:55
To: linux-ext4@xxxxxxxxxxxxxxx
Cc: tytso@xxxxxxx; Li Xi; yi.zhang@xxxxxxxxxx; adilger@xxxxxxxxx; Wang Shilong; Shuichi Ihara
Subject: Re: [PATCH 1/4] ext4: fix forgetten xattr lock protection in ext4_expand_extra_isize
Ping......
on 2017/7/7 at 1:09, Miao Xie wrote:
> We should avoid the contention between the i_extra_isize update and
> the inline data insertion, so move the xattr trylock in front of
> i_extra_isize update.
>
> Signed-off-by: Miao Xie <miaoxie@xxxxxxxxxx>
> Reviewed-by: Wang Shilong <wshilong@xxxxxxx>
> ---
> fs/ext4/inode.c | 18 ++++++++++++++++--
> fs/ext4/xattr.c | 10 ----------
> 2 files changed, 16 insertions(+), 12 deletions(-)
>
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 5cf82d0..4af3edc 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -5639,10 +5639,15 @@ static int ext4_expand_extra_isize(struct inode *inode,
> {
> struct ext4_inode *raw_inode;
> struct ext4_xattr_ibody_header *header;
> + int no_expand;
> + int error;
>
> if (EXT4_I(inode)->i_extra_isize >= new_extra_isize)
> return 0;
>
> + if (ext4_write_trylock_xattr(inode, &no_expand) == 0)
> + return 0;
> +
> raw_inode = ext4_raw_inode(&iloc);
>
> header = IHDR(inode, raw_inode);
> @@ -5654,12 +5659,21 @@ static int ext4_expand_extra_isize(struct inode *inode,
> EXT4_I(inode)->i_extra_isize, 0,
> new_extra_isize - EXT4_I(inode)->i_extra_isize);
> EXT4_I(inode)->i_extra_isize = new_extra_isize;
> + ext4_write_unlock_xattr(inode, &no_expand);
> return 0;
> }
>
> /* try to expand with EAs present */
> - return ext4_expand_extra_isize_ea(inode, new_extra_isize,
> - raw_inode, handle);
> + error = ext4_expand_extra_isize_ea(inode, new_extra_isize,
> + raw_inode, handle);
> + if (error) {
> + /*
> + * Inode size expansion failed; don't try again
> + */
> + no_expand = 1;
> + }
> + ext4_write_unlock_xattr(inode, &no_expand);
> + return error;
> }
>
> /*
> diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
> index 5d3c253..12ee5fb 100644
> --- a/fs/ext4/xattr.c
> +++ b/fs/ext4/xattr.c
> @@ -1472,10 +1472,6 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
> int error = 0, tried_min_extra_isize = 0;
> int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize);
> int isize_diff; /* How much do we need to grow i_extra_isize */
> - int no_expand;
> -
> - if (ext4_write_trylock_xattr(inode, &no_expand) == 0)
> - return 0;
>
> retry:
> isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize;
> @@ -1558,16 +1554,10 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
> EXT4_I(inode)->i_extra_isize = new_extra_isize;
> brelse(bh);
> out:
> - ext4_write_unlock_xattr(inode, &no_expand);
> return 0;
>
> cleanup:
> brelse(bh);
> - /*
> - * Inode size expansion failed; don't try again
> - */
> - no_expand = 1;
> - ext4_write_unlock_xattr(inode, &no_expand);
> return error;
> }
>
>
