[v6,11/16] erofs: Convert compressed files from readpages to readahead
diff mbox series

Message ID 20200217184613.19668-20-willy@infradead.org
State New
Headers show
Series
  • Untitled series #242855
Related show

Commit Message

Matthew Wilcox Feb. 17, 2020, 6:46 p.m. UTC
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>

Use the new readahead operation in erofs.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/erofs/zdata.c | 29 +++++++++--------------------
 1 file changed, 9 insertions(+), 20 deletions(-)

Comments

Gao Xiang Feb. 19, 2020, 2:34 a.m. UTC | #1
On Mon, Feb 17, 2020 at 10:46:00AM -0800, Matthew Wilcox wrote:
> From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
> 
> Use the new readahead operation in erofs.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

It looks good to me, although some further optimization exists
but we could make a straight-forward transform first, and
I haven't tested the whole series for now...
Will test it later.

Acked-by: Gao Xiang <gaoxiang25@huawei.com>

Thanks,
Gao Xiang

> ---
>  fs/erofs/zdata.c | 29 +++++++++--------------------
>  1 file changed, 9 insertions(+), 20 deletions(-)
> 
> diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
> index 17f45fcb8c5c..7c02015d501d 100644
> --- a/fs/erofs/zdata.c
> +++ b/fs/erofs/zdata.c
> @@ -1303,28 +1303,23 @@ static bool should_decompress_synchronously(struct erofs_sb_info *sbi,
>  	return nr <= sbi->max_sync_decompress_pages;
>  }
>  
> -static int z_erofs_readpages(struct file *filp, struct address_space *mapping,
> -			     struct list_head *pages, unsigned int nr_pages)
> +static void z_erofs_readahead(struct readahead_control *rac)
>  {
> -	struct inode *const inode = mapping->host;
> +	struct inode *const inode = rac->mapping->host;
>  	struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
>  
> -	bool sync = should_decompress_synchronously(sbi, nr_pages);
> +	bool sync = should_decompress_synchronously(sbi, readahead_count(rac));
>  	struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode);
> -	gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL);
> -	struct page *head = NULL;
> +	struct page *page, *head = NULL;
>  	LIST_HEAD(pagepool);
>  
> -	trace_erofs_readpages(mapping->host, lru_to_page(pages)->index,
> -			      nr_pages, false);
> +	trace_erofs_readpages(inode, readahead_index(rac),
> +			readahead_count(rac), false);
>  
> -	f.headoffset = (erofs_off_t)lru_to_page(pages)->index << PAGE_SHIFT;
> -
> -	for (; nr_pages; --nr_pages) {
> -		struct page *page = lru_to_page(pages);
> +	f.headoffset = readahead_offset(rac);
>  
> +	readahead_for_each(rac, page) {
>  		prefetchw(&page->flags);
> -		list_del(&page->lru);
>  
>  		/*
>  		 * A pure asynchronous readahead is indicated if
> @@ -1333,11 +1328,6 @@ static int z_erofs_readpages(struct file *filp, struct address_space *mapping,
>  		 */
>  		sync &= !(PageReadahead(page) && !head);
>  
> -		if (add_to_page_cache_lru(page, mapping, page->index, gfp)) {
> -			list_add(&page->lru, &pagepool);
> -			continue;
> -		}
> -
>  		set_page_private(page, (unsigned long)head);
>  		head = page;
>  	}
> @@ -1366,11 +1356,10 @@ static int z_erofs_readpages(struct file *filp, struct address_space *mapping,
>  
>  	/* clean up the remaining free pages */
>  	put_pages_list(&pagepool);
> -	return 0;
>  }
>  
>  const struct address_space_operations z_erofs_aops = {
>  	.readpage = z_erofs_readpage,
> -	.readpages = z_erofs_readpages,
> +	.readahead = z_erofs_readahead,
>  };
>  
> -- 
> 2.25.0
> 
>

Patch
diff mbox series

diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 17f45fcb8c5c..7c02015d501d 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -1303,28 +1303,23 @@  static bool should_decompress_synchronously(struct erofs_sb_info *sbi,
 	return nr <= sbi->max_sync_decompress_pages;
 }
 
-static int z_erofs_readpages(struct file *filp, struct address_space *mapping,
-			     struct list_head *pages, unsigned int nr_pages)
+static void z_erofs_readahead(struct readahead_control *rac)
 {
-	struct inode *const inode = mapping->host;
+	struct inode *const inode = rac->mapping->host;
 	struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
 
-	bool sync = should_decompress_synchronously(sbi, nr_pages);
+	bool sync = should_decompress_synchronously(sbi, readahead_count(rac));
 	struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode);
-	gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL);
-	struct page *head = NULL;
+	struct page *page, *head = NULL;
 	LIST_HEAD(pagepool);
 
-	trace_erofs_readpages(mapping->host, lru_to_page(pages)->index,
-			      nr_pages, false);
+	trace_erofs_readpages(inode, readahead_index(rac),
+			readahead_count(rac), false);
 
-	f.headoffset = (erofs_off_t)lru_to_page(pages)->index << PAGE_SHIFT;
-
-	for (; nr_pages; --nr_pages) {
-		struct page *page = lru_to_page(pages);
+	f.headoffset = readahead_offset(rac);
 
+	readahead_for_each(rac, page) {
 		prefetchw(&page->flags);
-		list_del(&page->lru);
 
 		/*
 		 * A pure asynchronous readahead is indicated if
@@ -1333,11 +1328,6 @@  static int z_erofs_readpages(struct file *filp, struct address_space *mapping,
 		 */
 		sync &= !(PageReadahead(page) && !head);
 
-		if (add_to_page_cache_lru(page, mapping, page->index, gfp)) {
-			list_add(&page->lru, &pagepool);
-			continue;
-		}
-
 		set_page_private(page, (unsigned long)head);
 		head = page;
 	}
@@ -1366,11 +1356,10 @@  static int z_erofs_readpages(struct file *filp, struct address_space *mapping,
 
 	/* clean up the remaining free pages */
 	put_pages_list(&pagepool);
-	return 0;
 }
 
 const struct address_space_operations z_erofs_aops = {
 	.readpage = z_erofs_readpage,
-	.readpages = z_erofs_readpages,
+	.readahead = z_erofs_readahead,
 };