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Date: Sat, 1 Feb 2020 07:12:38 -0800
From: Matthew Wilcox <willy@...radead.org>
To: linux-fsdevel@...r.kernel.org
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: [PATCH v4 10/12] f2fs: Convert from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
Use the new readahead operation in f2fs
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net
---
fs/f2fs/data.c | 35 ++++++++++++++---------------------
fs/f2fs/f2fs.h | 5 ++---
fs/f2fs/verity.c | 16 +++++++++++-----
include/trace/events/f2fs.h | 6 +++---
4 files changed, 30 insertions(+), 32 deletions(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 8bd9afa81c54..80803f8b1b40 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2159,9 +2159,8 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
* use ->readpage() or do the necessary surgery to decouple ->readpages()
* from read-ahead.
*/
-int f2fs_mpage_readpages(struct address_space *mapping,
- struct list_head *pages, struct page *page,
- unsigned nr_pages, bool is_readahead)
+int f2fs_mpage_readpages(struct address_space *mapping, pgoff_t start,
+ struct page *page, unsigned nr_pages, bool is_readahead)
{
struct bio *bio = NULL;
sector_t last_block_in_bio = 0;
@@ -2192,15 +2191,10 @@ int f2fs_mpage_readpages(struct address_space *mapping,
map.m_may_create = false;
for (; nr_pages; nr_pages--) {
- if (pages) {
- page = list_last_entry(pages, struct page, lru);
+ if (is_readahead) {
+ page = readahead_page(mapping, start++);
prefetchw(&page->flags);
- list_del(&page->lru);
- if (add_to_page_cache_lru(page, mapping,
- page_index(page),
- readahead_gfp_mask(mapping)))
- goto next_page;
}
#ifdef CONFIG_F2FS_FS_COMPRESSION
@@ -2243,7 +2237,7 @@ int f2fs_mpage_readpages(struct address_space *mapping,
unlock_page(page);
}
next_page:
- if (pages)
+ if (is_readahead)
put_page(page);
#ifdef CONFIG_F2FS_FS_COMPRESSION
@@ -2259,10 +2253,9 @@ int f2fs_mpage_readpages(struct address_space *mapping,
}
#endif
}
- BUG_ON(pages && !list_empty(pages));
if (bio)
__submit_bio(F2FS_I_SB(inode), bio, DATA);
- return pages ? 0 : ret;
+ return ret;
}
static int f2fs_read_data_page(struct file *file, struct page *page)
@@ -2282,27 +2275,27 @@ static int f2fs_read_data_page(struct file *file, struct page *page)
ret = f2fs_read_inline_data(inode, page);
if (ret == -EAGAIN)
ret = f2fs_mpage_readpages(page_file_mapping(page),
- NULL, page, 1, false);
+ 0, page, 1, false);
return ret;
}
-static int f2fs_read_data_pages(struct file *file,
+static unsigned f2fs_readahead(struct file *file,
struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+ pgoff_t start, unsigned nr_pages)
{
struct inode *inode = mapping->host;
- struct page *page = list_last_entry(pages, struct page, lru);
- trace_f2fs_readpages(inode, page, nr_pages);
+ trace_f2fs_readpages(inode, start, nr_pages);
if (!f2fs_is_compress_backend_ready(inode))
return 0;
/* If the file has inline data, skip readpages */
if (f2fs_has_inline_data(inode))
- return 0;
+ return nr_pages;
- return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages, true);
+ f2fs_mpage_readpages(mapping, start, NULL, nr_pages, true);
+ return 0;
}
int f2fs_encrypt_one_page(struct f2fs_io_info *fio)
@@ -3778,7 +3771,7 @@ static void f2fs_swap_deactivate(struct file *file)
const struct address_space_operations f2fs_dblock_aops = {
.readpage = f2fs_read_data_page,
- .readpages = f2fs_read_data_pages,
+ .readahead = f2fs_readahead,
.writepage = f2fs_write_data_page,
.writepages = f2fs_write_data_pages,
.write_begin = f2fs_write_begin,
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 5355be6b6755..db00907f90f1 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3344,9 +3344,8 @@ int f2fs_reserve_new_block(struct dnode_of_data *dn);
int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index);
int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from);
int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index);
-int f2fs_mpage_readpages(struct address_space *mapping,
- struct list_head *pages, struct page *page,
- unsigned nr_pages, bool is_readahead);
+int f2fs_mpage_readpages(struct address_space *mapping, pgoff_t start,
+ struct page *page, unsigned nr_pages, bool is_readahead);
struct page *f2fs_get_read_data_page(struct inode *inode, pgoff_t index,
int op_flags, bool for_write);
struct page *f2fs_find_data_page(struct inode *inode, pgoff_t index);
diff --git a/fs/f2fs/verity.c b/fs/f2fs/verity.c
index d7d430a6f130..71e92b9b3aa6 100644
--- a/fs/f2fs/verity.c
+++ b/fs/f2fs/verity.c
@@ -231,7 +231,6 @@ static int f2fs_get_verity_descriptor(struct inode *inode, void *buf,
static void f2fs_merkle_tree_readahead(struct address_space *mapping,
pgoff_t start_index, unsigned long count)
{
- LIST_HEAD(pages);
unsigned int nr_pages = 0;
struct page *page;
pgoff_t index;
@@ -240,16 +239,23 @@ static void f2fs_merkle_tree_readahead(struct address_space *mapping,
for (index = start_index; index < start_index + count; index++) {
page = xa_load(&mapping->i_pages, index);
if (!page || xa_is_value(page)) {
- page = __page_cache_alloc(readahead_gfp_mask(mapping));
+ gfp_t gfp = readahead_gfp_mask(mapping);
+ page = __page_cache_alloc(gfp);
if (!page)
break;
- page->index = index;
- list_add(&page->lru, &pages);
+ if (add_to_page_cache_lru(page, mapping, index, gfp)) {
+ put_page(page);
+ break;
+ }
nr_pages++;
}
}
+
+ if (!nr_pages)
+ return;
+
blk_start_plug(&plug);
- f2fs_mpage_readpages(mapping, &pages, NULL, nr_pages, true);
+ f2fs_mpage_readpages(mapping, start_index, NULL, nr_pages, true);
blk_finish_plug(&plug);
}
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 67a97838c2a0..d72da4a33883 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -1375,9 +1375,9 @@ TRACE_EVENT(f2fs_writepages,
TRACE_EVENT(f2fs_readpages,
- TP_PROTO(struct inode *inode, struct page *page, unsigned int nrpage),
+ TP_PROTO(struct inode *inode, pgoff_t start, unsigned int nrpage),
- TP_ARGS(inode, page, nrpage),
+ TP_ARGS(inode, start, nrpage),
TP_STRUCT__entry(
__field(dev_t, dev)
@@ -1389,7 +1389,7 @@ TRACE_EVENT(f2fs_readpages,
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
- __entry->start = page->index;
+ __entry->start = start;
__entry->nrpage = nrpage;
),
--
2.24.1
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