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Date:   Fri, 23 Sep 2022 13:25:34 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ye Bin <yebin10@...wei.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        jack@...e.cz
Subject: Re: [PATCH -next] ext4: factor out ext4_free_ext_path()

On Fri 23-09-22 09:32:54, Ye Bin wrote:
> Factor out ext4_free_ext_path(). No functional change.
> 
> Signed-off-by: Ye Bin <yebin10@...wei.com>

Nice. Just maybe I'd make ext4_free_ext_path() not inline and just put it
into extents.c. Because after this patch ext4_ext_drop_refs() is only used
in three places - ext4_free_ext_path(), ext4_find_extent(), and
mext_check_coverage(). The use in mext_check_coverage() can be actually
removed - get_ext_path() -> ext4_find_extent() takes care of dropping the
references. And then ext4_ext_drop_refs() can be made static making things
more obvious...

								Honza

> ---
>  fs/ext4/ext4.h           |  6 ++++
>  fs/ext4/extents.c        | 75 ++++++++++++++--------------------------
>  fs/ext4/extents_status.c |  3 +-
>  fs/ext4/fast_commit.c    |  6 ++--
>  fs/ext4/migrate.c        |  3 +-
>  fs/ext4/move_extent.c    |  9 ++---
>  fs/ext4/verity.c         |  6 ++--
>  7 files changed, 40 insertions(+), 68 deletions(-)
> 
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index e6674504ca2a..0583e5c8d395 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -3786,6 +3786,12 @@ extern void ext4_orphan_file_block_trigger(
>  				struct buffer_head *bh,
>  				void *data, size_t size);
>  
> +static inline void ext4_free_ext_path(struct ext4_ext_path *path)
> +{
> +	ext4_ext_drop_refs(path);
> +	kfree(path);
> +}
> +
>  /*
>   * Add new method to test whether block and inode bitmaps are properly
>   * initialized. With uninit_bg reading the block from disk is not enough
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index c148bb97b527..60ff1a764f52 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -632,8 +632,7 @@ int ext4_ext_precache(struct inode *inode)
>  	ext4_set_inode_state(inode, EXT4_STATE_EXT_PRECACHED);
>  out:
>  	up_read(&ei->i_data_sem);
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  	return ret;
>  }
>  
> @@ -951,8 +950,7 @@ ext4_find_extent(struct inode *inode, ext4_lblk_t block,
>  	return path;
>  
>  err:
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  	if (orig_path)
>  		*orig_path = NULL;
>  	return ERR_PTR(ret);
> @@ -2170,8 +2168,7 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
>  	err = ext4_ext_dirty(handle, inode, path + path->p_depth);
>  
>  cleanup:
> -	ext4_ext_drop_refs(npath);
> -	kfree(npath);
> +	ext4_free_ext_path(npath);
>  	return err;
>  }
>  
> @@ -3057,8 +3054,7 @@ int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
>  		}
>  	}
>  out:
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  	path = NULL;
>  	if (err == -EAGAIN)
>  		goto again;
> @@ -4371,8 +4367,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
>  	allocated = map->m_len;
>  	ext4_ext_show_leaf(inode, path);
>  out:
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  
>  	trace_ext4_ext_map_blocks_exit(inode, flags, map,
>  				       err ? err : allocated);
> @@ -5241,8 +5236,7 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
>  			break;
>  	}
>  out:
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  	return ret;
>  }
>  
> @@ -5534,15 +5528,13 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
>  					EXT4_GET_BLOCKS_METADATA_NOFAIL);
>  		}
>  
> -		ext4_ext_drop_refs(path);
> -		kfree(path);
> +		ext4_free_ext_path(path);
>  		if (ret < 0) {
>  			up_write(&EXT4_I(inode)->i_data_sem);
>  			goto out_stop;
>  		}
>  	} else {
> -		ext4_ext_drop_refs(path);
> -		kfree(path);
> +		ext4_free_ext_path(path);
>  	}
>  
>  	ret = ext4_es_remove_extent(inode, offset_lblk,
> @@ -5762,10 +5754,8 @@ ext4_swap_extents(handle_t *handle, struct inode *inode1,
>  		count -= len;
>  
>  	repeat:
> -		ext4_ext_drop_refs(path1);
> -		kfree(path1);
> -		ext4_ext_drop_refs(path2);
> -		kfree(path2);
> +		ext4_free_ext_path(path1);
> +		ext4_free_ext_path(path2);
>  		path1 = path2 = NULL;
>  	}
>  	return replaced_count;
> @@ -5844,8 +5834,7 @@ int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu)
>  	}
>  
>  out:
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  
>  	return err ? err : mapped;
>  }
> @@ -5912,8 +5901,7 @@ int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
>  	ret = ext4_ext_dirty(NULL, inode, &path[path->p_depth]);
>  	up_write(&EXT4_I(inode)->i_data_sem);
>  out:
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  	ext4_mark_inode_dirty(NULL, inode);
>  	return ret;
>  }
> @@ -5931,8 +5919,7 @@ void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end)
>  			return;
>  		ex = path[path->p_depth].p_ext;
>  		if (!ex) {
> -			ext4_ext_drop_refs(path);
> -			kfree(path);
> +			ext4_free_ext_path(path);
>  			ext4_mark_inode_dirty(NULL, inode);
>  			return;
>  		}
> @@ -5945,8 +5932,7 @@ void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end)
>  		ext4_ext_dirty(NULL, inode, &path[path->p_depth]);
>  		up_write(&EXT4_I(inode)->i_data_sem);
>  		ext4_mark_inode_dirty(NULL, inode);
> -		ext4_ext_drop_refs(path);
> -		kfree(path);
> +		ext4_free_ext_path(path);
>  	}
>  }
>  
> @@ -5985,13 +5971,11 @@ int ext4_ext_replay_set_iblocks(struct inode *inode)
>  		return PTR_ERR(path);
>  	ex = path[path->p_depth].p_ext;
>  	if (!ex) {
> -		ext4_ext_drop_refs(path);
> -		kfree(path);
> +		ext4_free_ext_path(path);
>  		goto out;
>  	}
>  	end = le32_to_cpu(ex->ee_block) + ext4_ext_get_actual_len(ex);
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  
>  	/* Count the number of data blocks */
>  	cur = 0;
> @@ -6021,30 +6005,26 @@ int ext4_ext_replay_set_iblocks(struct inode *inode)
>  	if (IS_ERR(path))
>  		goto out;
>  	numblks += path->p_depth;
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  	while (cur < end) {
>  		path = ext4_find_extent(inode, cur, NULL, 0);
>  		if (IS_ERR(path))
>  			break;
>  		ex = path[path->p_depth].p_ext;
>  		if (!ex) {
> -			ext4_ext_drop_refs(path);
> -			kfree(path);
> +			ext4_free_ext_path(path);
>  			return 0;
>  		}
>  		cur = max(cur + 1, le32_to_cpu(ex->ee_block) +
>  					ext4_ext_get_actual_len(ex));
>  		ret = skip_hole(inode, &cur);
>  		if (ret < 0) {
> -			ext4_ext_drop_refs(path);
> -			kfree(path);
> +			ext4_free_ext_path(path);
>  			break;
>  		}
>  		path2 = ext4_find_extent(inode, cur, NULL, 0);
>  		if (IS_ERR(path2)) {
> -			ext4_ext_drop_refs(path);
> -			kfree(path);
> +			ext4_free_ext_path(path);
>  			break;
>  		}
>  		for (i = 0; i <= max(path->p_depth, path2->p_depth); i++) {
> @@ -6058,10 +6038,8 @@ int ext4_ext_replay_set_iblocks(struct inode *inode)
>  			if (cmp1 != cmp2 && cmp2 != 0)
>  				numblks++;
>  		}
> -		ext4_ext_drop_refs(path);
> -		ext4_ext_drop_refs(path2);
> -		kfree(path);
> -		kfree(path2);
> +		ext4_free_ext_path(path);
> +		ext4_free_ext_path(path2);
>  	}
>  
>  out:
> @@ -6088,13 +6066,11 @@ int ext4_ext_clear_bb(struct inode *inode)
>  		return PTR_ERR(path);
>  	ex = path[path->p_depth].p_ext;
>  	if (!ex) {
> -		ext4_ext_drop_refs(path);
> -		kfree(path);
> +		ext4_free_ext_path(path);
>  		return 0;
>  	}
>  	end = le32_to_cpu(ex->ee_block) + ext4_ext_get_actual_len(ex);
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  
>  	cur = 0;
>  	while (cur < end) {
> @@ -6113,8 +6089,7 @@ int ext4_ext_clear_bb(struct inode *inode)
>  					ext4_fc_record_regions(inode->i_sb, inode->i_ino,
>  							0, path[j].p_block, 1, 1);
>  				}
> -				ext4_ext_drop_refs(path);
> -				kfree(path);
> +				ext4_free_ext_path(path);
>  			}
>  			ext4_mb_mark_bb(inode->i_sb, map.m_pblk, map.m_len, 0);
>  			ext4_fc_record_regions(inode->i_sb, inode->i_ino,
> diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
> index 23167efda95e..cd0a861853e3 100644
> --- a/fs/ext4/extents_status.c
> +++ b/fs/ext4/extents_status.c
> @@ -667,8 +667,7 @@ static void ext4_es_insert_extent_ext_check(struct inode *inode,
>  		}
>  	}
>  out:
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  }
>  
>  static void ext4_es_insert_extent_ind_check(struct inode *inode,
> diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
> index 9549d89b3519..54ccc61c713a 100644
> --- a/fs/ext4/fast_commit.c
> +++ b/fs/ext4/fast_commit.c
> @@ -1770,8 +1770,7 @@ static int ext4_fc_replay_add_range(struct super_block *sb,
>  			ret = ext4_ext_insert_extent(
>  				NULL, inode, &path, &newex, 0);
>  			up_write((&EXT4_I(inode)->i_data_sem));
> -			ext4_ext_drop_refs(path);
> -			kfree(path);
> +			ext4_free_ext_path(path);
>  			if (ret)
>  				goto out;
>  			goto next;
> @@ -1926,8 +1925,7 @@ static void ext4_fc_set_bitmaps_and_counters(struct super_block *sb)
>  					for (j = 0; j < path->p_depth; j++)
>  						ext4_mb_mark_bb(inode->i_sb,
>  							path[j].p_block, 1, 1);
> -					ext4_ext_drop_refs(path);
> -					kfree(path);
> +					ext4_free_ext_path(path);
>  				}
>  				cur += ret;
>  				ext4_mb_mark_bb(inode->i_sb, map.m_pblk,
> diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
> index 54e7d3c95fd7..0a220ec9862d 100644
> --- a/fs/ext4/migrate.c
> +++ b/fs/ext4/migrate.c
> @@ -56,8 +56,7 @@ static int finish_range(handle_t *handle, struct inode *inode,
>  	retval = ext4_ext_insert_extent(handle, inode, &path, &newext, 0);
>  err_out:
>  	up_write((&EXT4_I(inode)->i_data_sem));
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  	lb->first_pblock = 0;
>  	return retval;
>  }
> diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
> index 701f1d6a217f..69e5e6a639cc 100644
> --- a/fs/ext4/move_extent.c
> +++ b/fs/ext4/move_extent.c
> @@ -32,8 +32,7 @@ get_ext_path(struct inode *inode, ext4_lblk_t lblock,
>  	if (IS_ERR(path))
>  		return PTR_ERR(path);
>  	if (path[ext_depth(inode)].p_ext == NULL) {
> -		ext4_ext_drop_refs(path);
> -		kfree(path);
> +		ext4_free_ext_path(path);
>  		*ppath = NULL;
>  		return -ENODATA;
>  	}
> @@ -107,8 +106,7 @@ mext_check_coverage(struct inode *inode, ext4_lblk_t from, ext4_lblk_t count,
>  	}
>  	ret = 1;
>  out:
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  	return ret;
>  }
>  
> @@ -694,8 +692,7 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
>  		ext4_discard_preallocations(donor_inode, 0);
>  	}
>  
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  	ext4_double_up_write_data_sem(orig_inode, donor_inode);
>  	unlock_two_nondirectories(orig_inode, donor_inode);
>  
> diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
> index b051d19b5c8a..20cadfb740dc 100644
> --- a/fs/ext4/verity.c
> +++ b/fs/ext4/verity.c
> @@ -298,16 +298,14 @@ static int ext4_get_verity_descriptor_location(struct inode *inode,
>  	last_extent = path[path->p_depth].p_ext;
>  	if (!last_extent) {
>  		EXT4_ERROR_INODE(inode, "verity file has no extents");
> -		ext4_ext_drop_refs(path);
> -		kfree(path);
> +		ext4_free_ext_path(path);
>  		return -EFSCORRUPTED;
>  	}
>  
>  	end_lblk = le32_to_cpu(last_extent->ee_block) +
>  		   ext4_ext_get_actual_len(last_extent);
>  	desc_size_pos = (u64)end_lblk << inode->i_blkbits;
> -	ext4_ext_drop_refs(path);
> -	kfree(path);
> +	ext4_free_ext_path(path);
>  
>  	if (desc_size_pos < sizeof(desc_size_disk))
>  		goto bad;
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR

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