Re: [PATCH] staging: erofs: clean up erofs_map_blocks_iter

[Chao Yu]

Hi Xiang,

Thanks for the review, let me fix them all and send v2. :)

Thanks,

On 2019/1/9 19:54, Gao Xiang wrote:
> Hi Chao,
> 
> On 2019/1/9 17:46, Chao Yu wrote:
>> This patch cleans up erofs_map_blocks* function and structure family,
>> just simply the code, no logic change.
>>
>> Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
>> ---
>>  drivers/staging/erofs/data.c      | 40 +++++++------------------------
>>  drivers/staging/erofs/internal.h  | 16 ++++++-------
>>  drivers/staging/erofs/unzip_vle.c | 30 +++++++++++------------
>>  3 files changed, 31 insertions(+), 55 deletions(-)
>>
>> diff --git a/drivers/staging/erofs/data.c b/drivers/staging/erofs/data.c
>> index 5a55f0bfdfbb..1baa59cf11b5 100644
>> --- a/drivers/staging/erofs/data.c
>> +++ b/drivers/staging/erofs/data.c
>> @@ -165,43 +165,19 @@ static int erofs_map_blocks_flatmode(struct inode *inode,
>>  	return err;
>>  }
>>  
>> -#ifdef CONFIG_EROFS_FS_ZIP
>> -extern int z_erofs_map_blocks_iter(struct inode *,
>> -				   struct erofs_map_blocks *,
>> -				   struct page **, int);
>> -#endif
>> -
>> -int erofs_map_blocks_iter(struct inode *inode,
>> -			  struct erofs_map_blocks *map,
>> -			  struct page **mpage_ret, int flags)
>> -{
>> -	/* by default, reading raw data never use erofs_map_blocks_iter */
>> -	if (unlikely(!is_inode_layout_compression(inode))) {
>> -		if (*mpage_ret)
>> -			put_page(*mpage_ret);
>> -		*mpage_ret = NULL;
>> -
>> -		return erofs_map_blocks(inode, map, flags);
>> -	}
>> -
>> -#ifdef CONFIG_EROFS_FS_ZIP
>> -	return z_erofs_map_blocks_iter(inode, map, mpage_ret, flags);
>> -#else
>> -	/* data compression is not available */
>> -	return -ENOTSUPP;
>> -#endif
>> -}
>> -
>>  int erofs_map_blocks(struct inode *inode,
>>  		     struct erofs_map_blocks *map, int flags)
>>  {
>>  	if (unlikely(is_inode_layout_compression(inode))) {
>> -		struct page *mpage = NULL;
>> -		int err;
>> +		int err = -ENOTSUPP;
>>  
>> -		err = erofs_map_blocks_iter(inode, map, &mpage, flags);
>> -		if (mpage)
>> -			put_page(mpage);
>> +#ifdef CONFIG_EROFS_FS_ZIP
>> +		map->mpage = NULL;
> 
> remove this line? since z_erofs_map_blocks_iter will do put_page internally
> if mpage != NULL.
> 
>> +
>> +		err = z_erofs_map_blocks_iter(inode, map, flags);
>> +#endif
>> +		if (map->mpage)
>> +			put_page(map->mpage);
> 
> 
> 		if (map->mpage) {
> 			put_page(map->mpage);
>                         map->mpage = NULL;
> 		}
> 
> 
>>  		return err;
>>  	}
>>  	return erofs_map_blocks_flatmode(inode, map, flags);
>> diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h
>> index e049d00c087a..740961fc565f 100644
>> --- a/drivers/staging/erofs/internal.h
>> +++ b/drivers/staging/erofs/internal.h
>> @@ -461,8 +461,16 @@ struct erofs_map_blocks {
>>  	u64 m_plen, m_llen;
>>  
>>  	unsigned int m_flags;
>> +
>> +	struct page *mpage;
>>  };
>>  
>> +#ifdef CONFIG_EROFS_FS_ZIP
>> +extern int z_erofs_map_blocks_iter(struct inode *,
>> +				   struct erofs_map_blocks *,
>> +				   int);
> 
> #else
> 
> static inline z_erofs_map_blocks_iter(struct inode *, ...) { return -ENOTSUPP;}
> 
>  --- therefore redundant CONFIG_EROFS_FS_ZIPs could be removed.
> 
> #endif
> 
>> +#endif
>> +
>>  /* Flags used by erofs_map_blocks() */
>>  #define EROFS_GET_BLOCKS_RAW    0x0001
>>  
>> @@ -522,14 +530,6 @@ static inline struct page *erofs_get_meta_page_nofail(struct super_block *sb,
>>  }
>>  
>>  extern int erofs_map_blocks(struct inode *, struct erofs_map_blocks *, int);
>> -extern int erofs_map_blocks_iter(struct inode *, struct erofs_map_blocks *,
>> -	struct page **, int);
>> -
>> -struct erofs_map_blocks_iter {
>> -	struct erofs_map_blocks map;
>> -	struct page *mpage;
>> -};
>> -
>>  
>>  static inline struct page *
>>  erofs_get_inline_page(struct inode *inode,
>> diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c
>> index 4ac1099a39c6..30340afaa504 100644
>> --- a/drivers/staging/erofs/unzip_vle.c
>> +++ b/drivers/staging/erofs/unzip_vle.c
>> @@ -636,7 +636,7 @@ struct z_erofs_vle_frontend {
>>  	struct inode *const inode;
>>  
>>  	struct z_erofs_vle_work_builder builder;
>> -	struct erofs_map_blocks_iter m_iter;
>> +	struct erofs_map_blocks map;
>>  
>>  	z_erofs_vle_owned_workgrp_t owned_head;
>>  
>> @@ -647,8 +647,9 @@ struct z_erofs_vle_frontend {
>>  
>>  #define VLE_FRONTEND_INIT(__i) { \
>>  	.inode = __i, \
>> -	.m_iter = { \
>> -		{ .m_llen = 0, .m_plen = 0 }, \
>> +	.map = { \
>> +		.m_llen = 0, \
>> +		.m_plen = 0, \
>>  		.mpage = NULL \
>>  	}, \
>>  	.builder = VLE_WORK_BUILDER_INIT(), \
>> @@ -681,8 +682,7 @@ static int z_erofs_do_read_page(struct z_erofs_vle_frontend *fe,
>>  {
>>  	struct super_block *const sb = fe->inode->i_sb;
>>  	struct erofs_sb_info *const sbi __maybe_unused = EROFS_SB(sb);
>> -	struct erofs_map_blocks_iter *const m = &fe->m_iter;
>> -	struct erofs_map_blocks *const map = &m->map;
>> +	struct erofs_map_blocks *const map = &fe->map;
>>  	struct z_erofs_vle_work_builder *const builder = &fe->builder;
>>  	const loff_t offset = page_offset(page);
>>  
>> @@ -715,7 +715,7 @@ static int z_erofs_do_read_page(struct z_erofs_vle_frontend *fe,
>>  
>>  	map->m_la = offset + cur;
>>  	map->m_llen = 0;
>> -	err = erofs_map_blocks_iter(fe->inode, map, &m->mpage, 0);
>> +	err = erofs_map_blocks(fe->inode, map, 0);
> 
> should use z_erofs_map_blocks_iter then rather than erofs_map_blocks
> 
> Thanks,
> Gao Xiang
> 
>>  	if (unlikely(err))
>>  		goto err_out;
>>  
>> @@ -1484,8 +1484,8 @@ static int z_erofs_vle_normalaccess_readpage(struct file *file,
>>  
>>  	z_erofs_submit_and_unzip(&f, &pagepool, true);
>>  out:
>> -	if (f.m_iter.mpage)
>> -		put_page(f.m_iter.mpage);
>> +	if (f.map.mpage)
>> +		put_page(f.map.mpage);
>>  
>>  	/* clean up the remaining free pages */
>>  	put_pages_list(&pagepool);
>> @@ -1555,8 +1555,8 @@ static int z_erofs_vle_normalaccess_readpages(struct file *filp,
>>  
>>  	z_erofs_submit_and_unzip(&f, &pagepool, sync);
>>  
>> -	if (f.m_iter.mpage)
>> -		put_page(f.m_iter.mpage);
>> +	if (f.map.mpage)
>> +		put_page(f.map.mpage);
>>  
>>  	/* clean up the remaining free pages */
>>  	put_pages_list(&pagepool);
>> @@ -1701,14 +1701,14 @@ vle_get_logical_extent_head(const struct vle_map_blocks_iter_ctx *ctx,
>>  
>>  int z_erofs_map_blocks_iter(struct inode *inode,
>>  	struct erofs_map_blocks *map,
>> -	struct page **mpage_ret, int flags)
>> +	int flags)
>>  {
>>  	void *kaddr;
>>  	const struct vle_map_blocks_iter_ctx ctx = {
>>  		.inode = inode,
>>  		.sb = inode->i_sb,
>>  		.clusterbits = EROFS_I_SB(inode)->clusterbits,
>> -		.mpage_ret = mpage_ret,
>> +		.mpage_ret = &map->mpage,
>>  		.kaddr_ret = &kaddr
>>  	};
>>  	const unsigned int clustersize = 1 << ctx.clusterbits;
>> @@ -1722,7 +1722,7 @@ int z_erofs_map_blocks_iter(struct inode *inode,
>>  
>>  	/* initialize `pblk' to keep gcc from printing foolish warnings */
>>  	erofs_blk_t mblk, pblk = 0;
>> -	struct page *mpage = *mpage_ret;
>> +	struct page *mpage = map->mpage;
>>  	struct z_erofs_vle_decompressed_index *di;
>>  	unsigned int cluster_type, logical_cluster_ofs;
>>  	int err = 0;
>> @@ -1758,7 +1758,7 @@ int z_erofs_map_blocks_iter(struct inode *inode,
>>  			err = PTR_ERR(mpage);
>>  			goto out;
>>  		}
>> -		*mpage_ret = mpage;
>> +		map->mpage = mpage;
>>  	} else {
>>  		lock_page(mpage);
>>  		DBG_BUGON(!PageUptodate(mpage));
>> @@ -1818,7 +1818,7 @@ int z_erofs_map_blocks_iter(struct inode *inode,
>>  		/* get the correspoinding first chunk */
>>  		err = vle_get_logical_extent_head(&ctx, lcn, &ofs,
>>  						  &pblk, &map->m_flags);
>> -		mpage = *mpage_ret;
>> +		mpage = map->mpage;
>>  
>>  		if (unlikely(err)) {
>>  			if (mpage)
>>
> 
> .
>