linux-kernel - Re: [PATCH v2] f2fs: support FIEMAP_FLAG

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Date:   Wed, 10 Jan 2018 14:19:42 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>
Subject: Re: [PATCH v2] f2fs: support FIEMAP_FLAG_XATTR

On 2018/1/10 2:11, Jaegeuk Kim wrote:
> On 01/08, Chao Yu wrote:
>> This patch enables ->fiemap to handle FIEMAP_FLAG_XATTR flag for xattr
>> mapping info lookup purpose.
>>
>> It makes f2fs passing generic/425 test in fstest.
>>
>> Signed-off-by: Chao Yu <yuchao0@...wei.com>
>> ---
>> v2: adjust f2fs_xattr_fiemap flow to handle the case that inline xattr and
>> xattr node both exist.
>>  fs/f2fs/data.c | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++----
>>  1 file changed, 71 insertions(+), 4 deletions(-)
>>
>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>> index cd988bc1922b..429764118604 100644
>> --- a/fs/f2fs/data.c
>> +++ b/fs/f2fs/data.c
>> @@ -1129,6 +1129,68 @@ static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
>>  	return (blk << inode->i_blkbits);
>>  }
>>  
>> +static int f2fs_xattr_fiemap(struct inode *inode,
>> +				struct fiemap_extent_info *fieinfo)
>> +{
>> +	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>> +	struct page *page;
>> +	struct node_info ni;
>> +	__u64 phys = 0, len;
>> +	__u32 flags;
>> +	nid_t xnid = F2FS_I(inode)->i_xattr_nid;
>> +	int err = 0;
>> +
>> +	if (f2fs_has_inline_xattr(inode)) {
>> +		int offset;
>> +
>> +		page = f2fs_grab_cache_page(NODE_MAPPING(sbi),
>> +						inode->i_ino, false);
>> +		if (!page)
>> +			return -ENOMEM;
>> +
>> +		get_node_info(sbi, inode->i_ino, &ni);
>> +
>> +		phys = (__u64)blk_to_logical(inode, ni.blk_addr);
>> +		offset = offsetof(struct f2fs_inode, i_addr) +
>> +					sizeof(__le32) * (DEF_ADDRS_PER_INODE -
>> +					F2FS_INLINE_XATTR_ADDRS(inode));
>> +
>> +		phys += offset;
>> +		len = inline_xattr_size(inode);
>> +
>> +		f2fs_put_page(page, 1);
>> +
>> +		flags = FIEMAP_EXTENT_DATA_INLINE;
>> +
>> +		if (!xnid)
>> +			flags |= FIEMAP_EXTENT_LAST;
>> +
>> +		err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
>> +		if (err || err == 1)
>> +			return err;
>> +	}
>> +
>> +	if (xnid) {
>> +		page = f2fs_grab_cache_page(NODE_MAPPING(sbi), xnid, false);
>> +		if (!page)
>> +			return -ENOMEM;
>> +
>> +		get_node_info(sbi, xnid, &ni);
>> +
>> +		phys = (__u64)blk_to_logical(inode, ni.blk_addr);
>> +		len = inode->i_sb->s_blocksize;
>> +
>> +		f2fs_put_page(page, 1);
>> +
>> +		flags = FIEMAP_EXTENT_LAST;
>> +	}
>> +
>> +	if (phys)
>> +		err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
>> +
>> +	return (err < 0 ? err : 0);
>> +}
>> +
>>  int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
>>  		u64 start, u64 len)
>>  {
>> @@ -1139,18 +1201,23 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
>>  	u32 flags = 0;
>>  	int ret = 0;
>>  
>> -	ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
>> +	ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR);
>>  	if (ret)
>>  		return ret;
>>  
>> +	inode_lock(inode);
>> +
>> +	if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
>> +		ret = f2fs_xattr_fiemap(inode, fieinfo);
>> +		goto out;
>> +	}
>> +
> 
> We need to fix calling inode_lock() for the below block first?

Have sent another patch to fix this, could you check that?

Thanks,

> 
>>  	if (f2fs_has_inline_data(inode)) {
>>  		ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len);
>>  		if (ret != -EAGAIN)
>> -			return ret;
>> +			goto out;
>>  	}
>>  
>> -	inode_lock(inode);
>> -
>>  	if (logical_to_blk(inode, len) == 0)
>>  		len = blk_to_logical(inode, 1);
>>  
>> -- 
>> 2.15.0.55.gc2ece9dc4de6
> 
> .
>