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Date:	Tue, 17 Apr 2012 11:55:13 +0800
From:	Tao Ma <tm@....ma>
To:	Andreas Dilger <adilger@...ger.ca>
CC:	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH V4 17/22] ext4: let empty_dir handle inline dir.

Hi Andreas,
On 04/07/2012 08:21 AM, Andreas Dilger wrote:
> On 2012-02-20, at 12:01 AM, Tao Ma wrote:
>> From: Tao Ma <boyu.mt@...bao.com>
>>
>> empty_dir is used when deleting a dir. So it should handle
>> inline dir properly.
>>
>> Signed-off-by: Tao Ma <boyu.mt@...bao.com>
>> ---
>> fs/ext4/inline.c |   69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> fs/ext4/namei.c  |    8 ++++++
>> fs/ext4/xattr.h  |    6 ++++
>> 3 files changed, 83 insertions(+), 0 deletions(-)
>>
>> diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
>> index 3126ac3..6612ce1 100644
>> --- a/fs/ext4/inline.c
>> +++ b/fs/ext4/inline.c
>> @@ -1436,6 +1436,75 @@ out:
>> 	return err;
>> }
>>
>> +int empty_inline_dir(struct inode *dir, int *has_inline_data)
>> +{
>> +	int err, inline_size;
>> +	struct ext4_iloc iloc;
>> +	void *inline_pos;
>> +	unsigned int offset;
>> +	struct ext4_dir_entry_2 *de, *de1;
>> +	int ret = 1;
>> +
>> +	err = ext4_get_inode_loc(dir, &iloc);
>> +	if (err) {
>> +		EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
>> +				 err, dir->i_ino);
>> +		return 1;
>> +	}
>> +
>> +	down_read(&EXT4_I(dir)->xattr_sem);
>> +	if (!ext4_has_inline_data(dir)) {
>> +		*has_inline_data = 0;
>> +		goto out;
>> +	}
>> +
>> +	de = ext4_get_inline_entry(dir, &iloc, 0,
>> +				   &inline_pos, &inline_size);
>> +	de1 = ext4_get_inline_entry(dir, &iloc,
>> +			ext4_rec_len_from_disk(de->rec_len, inline_size),
>> +			&inline_pos, &inline_size);
>> +	if (le32_to_cpu(de->inode) != dir->i_ino ||
>> +			!le32_to_cpu(de1->inode) ||
>> +			strcmp(".", de->name) ||
>> +			strcmp("..", de1->name)) {
>> +		ext4_warning(dir->i_sb,
>> +			     "bad directory (dir #%lu) - no `.' or `..'",
>> +			     dir->i_ino);
>> +		ret = 1;
>> +		goto out;
>> +	}
>> +
>> +	offset = ext4_rec_len_from_disk(de->rec_len, inline_size) +
>> +		 ext4_rec_len_from_disk(de1->rec_len, inline_size);
>> +	while (offset < dir->i_size) {
>> +		de = ext4_get_inline_entry(dir, &iloc, offset,
>> +					   &inline_pos, &inline_size);
>> +		if (ext4_check_dir_entry(dir, NULL, de,
>> +					 iloc.bh, inline_pos,
>> +					 inline_size, offset)) {
>> +			ext4_warning(dir->i_sb,
>> +				     "bad inline directory (dir #%lu) - "
>> +				     "inode %u, rec_len %u, name_len %d"
>> +				     "inline size %d\n",
>> +				     dir->i_ino, le32_to_cpu(de->inode),
>> +				     le16_to_cpu(de->rec_len), de->name_len,
>> +				     inline_size);
>> +			ret = 1;
>> +			goto out;
>> +		}
> 
> Most of the code in this function is duplicated with empty_dir().  Instead of
> duplicating everything here, it seems that it is possible to just use the code
> in empty_dir() with a few small changes:
I just checked the codes and it seems a little bit hard for the
integration. the common codes are just the checker, but there are a lot
of difference between the inline dentry and block dentry iteration. So I
would prefer to leave it as-is.

Thanks
Tao
> 
> - a helper function which reads the first directory block instead of ext4_bread() 
>> +		if (le32_to_cpu(de->inode)) {
>> +			ret = 0;
>> +			goto out;
>> +		}
>> +		offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
>> +	}
>> +
>> +out:
>> +	up_read(&EXT4_I(dir)->xattr_sem);
>> +	brelse(iloc.bh);
>> +	return ret;
>> +}
>> +
>> int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
>> {
>> 	int ret;
>> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
>> index 9f7002c..b6b718e 100644
>> --- a/fs/ext4/namei.c
>> +++ b/fs/ext4/namei.c
>> @@ -2015,6 +2015,14 @@ static int empty_dir(struct inode *inode)
>> 	struct super_block *sb;
>> 	int err = 0;
>>
>> +	if (ext4_has_inline_data(inode)) {
>> +		int has_inline_data = 1;
>> +
>> +		err = empty_inline_dir(inode, &has_inline_data);
>> +		if (has_inline_data)
>> +			return err;
>> +	}
>> +
>> 	sb = inode->i_sb;
>> 	if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2) ||
>> 	    !(bh = ext4_bread(NULL, inode, 0, 0, &err))) {
>> diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
>> index 9991143..6ccfa8d 100644
>> --- a/fs/ext4/xattr.h
>> +++ b/fs/ext4/xattr.h
>> @@ -176,6 +176,7 @@ extern int ext4_delete_inline_entry(handle_t *handle,
>> 				    struct inode *dir,
>> 				    struct ext4_dir_entry_2 *de_del,
>> 				    struct buffer_head *bh);
>> +extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
>> # else  /* CONFIG_EXT4_FS_XATTR */
>>
>> static inline int
>> @@ -373,6 +374,11 @@ static inline int ext4_delete_inline_entry(handle_t *handle,
>> {
>> 	return 0;
>> }
>> +
>> +static inline int empty_inline_dir(struct inode *dir, int *has_inline_data)
>> +{
>> +	return 0;
>> +}
>> # endif  /* CONFIG_EXT4_FS_XATTR */
>>
>> #ifdef CONFIG_EXT4_FS_SECURITY
>> -- 
>> 1.7.0.4
>>
>> --
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> 
> 
> Cheers, Andreas
> 
> 
> 
> 
> 
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