[PATCH v2] f2fs: don't drop compressed page cache in .{invalidate,release}page

[PATCH v2] f2fs: don't drop compressed page cache in .{invalidate,release}page

[Chao Yu]

For compressed inode, in .{invalidate,release}page, we will call
f2fs_invalidate_compress_pages() to drop all compressed page cache of
current inode.

But we don't need to drop compressed page cache synchronously in
.invalidatepage, because, all trancation paths of compressed physical
block has been covered with f2fs_invalidate_compress_page().

And also we don't need to drop compressed page cache synchronously
in .releasepage, because, if there is out-of-memory, we can count
on page cache reclaim on sbi->compress_inode.

BTW, this patch may fix the issue reported below:

https://lore.kernel.org/linux-f2fs-devel/20211202092812.197647-1-changfengnan@vivo.com/T/#u

Signed-off-by: Chao Yu <chao@kernel.org>
---
v2:
- fix compile error.
 fs/f2fs/data.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 2737fcc0dbcf..0fc6e0245732 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -3528,12 +3528,9 @@ void f2fs_invalidate_page(struct page *page, unsigned int offset,
 
 	clear_page_private_gcing(page);
 
-	if (test_opt(sbi, COMPRESS_CACHE)) {
-		if (f2fs_compressed_file(inode))
-			f2fs_invalidate_compress_pages(sbi, inode->i_ino);
-		if (inode->i_ino == F2FS_COMPRESS_INO(sbi))
-			clear_page_private_data(page);
-	}
+	if (test_opt(sbi, COMPRESS_CACHE) &&
+			inode->i_ino == F2FS_COMPRESS_INO(sbi))
+		clear_page_private_data(page);
 
 	if (page_private_atomic(page))
 		return f2fs_drop_inmem_page(inode, page);
@@ -3553,12 +3550,9 @@ int f2fs_release_page(struct page *page, gfp_t wait)
 		return 0;
 
 	if (test_opt(F2FS_P_SB(page), COMPRESS_CACHE)) {
-		struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 		struct inode *inode = page->mapping->host;
 
-		if (f2fs_compressed_file(inode))
-			f2fs_invalidate_compress_pages(sbi, inode->i_ino);
-		if (inode->i_ino == F2FS_COMPRESS_INO(sbi))
+		if (inode->i_ino == F2FS_COMPRESS_INO(F2FS_I_SB(inode)))
 			clear_page_private_data(page);
 	}
 
-- 
2.32.0

Re: [PATCH v2] f2fs: don't drop compressed page cache in .{invalidate,release}page

[Jaegeuk Kim]

On 12/16, Chao Yu wrote:
> For compressed inode, in .{invalidate,release}page, we will call
> f2fs_invalidate_compress_pages() to drop all compressed page cache of
> current inode.
> 
> But we don't need to drop compressed page cache synchronously in
> .invalidatepage, because, all trancation paths of compressed physical
> block has been covered with f2fs_invalidate_compress_page().
> 
> And also we don't need to drop compressed page cache synchronously
> in .releasepage, because, if there is out-of-memory, we can count
> on page cache reclaim on sbi->compress_inode.
> 
> BTW, this patch may fix the issue reported below:
> 
> https://lore.kernel.org/linux-f2fs-devel/20211202092812.197647-1-changfengnan@vivo.com/T/#u

I think this patch makes more sense to me.

> 
> Signed-off-by: Chao Yu <chao@kernel.org>
> ---
> v2:
> - fix compile error.
>  fs/f2fs/data.c | 14 ++++----------
>  1 file changed, 4 insertions(+), 10 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 2737fcc0dbcf..0fc6e0245732 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -3528,12 +3528,9 @@ void f2fs_invalidate_page(struct page *page, unsigned int offset,
>  
>  	clear_page_private_gcing(page);
>  
> -	if (test_opt(sbi, COMPRESS_CACHE)) {
> -		if (f2fs_compressed_file(inode))
> -			f2fs_invalidate_compress_pages(sbi, inode->i_ino);
> -		if (inode->i_ino == F2FS_COMPRESS_INO(sbi))
> -			clear_page_private_data(page);
> -	}
> +	if (test_opt(sbi, COMPRESS_CACHE) &&
> +			inode->i_ino == F2FS_COMPRESS_INO(sbi))
> +		clear_page_private_data(page);
>  
>  	if (page_private_atomic(page))
>  		return f2fs_drop_inmem_page(inode, page);
> @@ -3553,12 +3550,9 @@ int f2fs_release_page(struct page *page, gfp_t wait)
>  		return 0;
>  
>  	if (test_opt(F2FS_P_SB(page), COMPRESS_CACHE)) {
> -		struct f2fs_sb_info *sbi = F2FS_P_SB(page);
>  		struct inode *inode = page->mapping->host;
>  
> -		if (f2fs_compressed_file(inode))
> -			f2fs_invalidate_compress_pages(sbi, inode->i_ino);
> -		if (inode->i_ino == F2FS_COMPRESS_INO(sbi))
> +		if (inode->i_ino == F2FS_COMPRESS_INO(F2FS_I_SB(inode)))
>  			clear_page_private_data(page);
>  	}
>  
> -- 
> 2.32.0