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Groups > linux.kernel > #1573538

[PATCH 2/5] f2fs: check last page index in cached bio to decide submission

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If the cached bio has the last page's index, then we need to submit it.
Otherwise, we don't need to submit it and can wait for further IO merges.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/checkpoint.c |  3 ++-
 fs/f2fs/data.c       | 39 +++++++++++++++++++++------------------
 fs/f2fs/f2fs.h       |  4 ++--
 fs/f2fs/node.c       |  9 ++++++---
 fs/f2fs/segment.c    |  8 ++++++--
 5 files changed, 37 insertions(+), 26 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index fb8cdfcaece6..e6e42a4b1344 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -249,7 +249,8 @@ static int f2fs_write_meta_page(struct page *page,
 	dec_page_count(sbi, F2FS_DIRTY_META);
 
 	if (wbc->for_reclaim)
-		f2fs_submit_merged_bio_cond(sbi, NULL, page, 0, META, WRITE);
+		f2fs_submit_merged_bio_cond(sbi, page->mapping->host,
+						0, page->index, META, WRITE);
 
 	unlock_page(page);
 
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 3b5f1d14cab3..c35db873637d 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -243,8 +243,8 @@ static void __submit_merged_bio(struct f2fs_bio_info *io)
 	io->bio = NULL;
 }
 
-static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode,
-						struct page *page, nid_t ino)
+static bool __has_merged_page(struct f2fs_bio_info *io,
+				struct inode *inode, nid_t ino, pgoff_t idx)
 {
 	struct bio_vec *bvec;
 	struct page *target;
@@ -253,7 +253,7 @@ static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode,
 	if (!io->bio)
 		return false;
 
-	if (!inode && !page && !ino)
+	if (!inode && !ino)
 		return true;
 
 	bio_for_each_segment_all(bvec, io->bio, i) {
@@ -263,10 +263,11 @@ static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode,
 		else
 			target = fscrypt_control_page(bvec->bv_page);
 
+		if (idx != target->index)
+			continue;
+
 		if (inode && inode == target->mapping->host)
 			return true;
-		if (page && page == target)
-			return true;
 		if (ino && ino == ino_of_node(target))
 			return true;
 	}
@@ -275,22 +276,21 @@ static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode,
 }
 
 static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
-						struct page *page, nid_t ino,
-						enum page_type type)
+				nid_t ino, pgoff_t idx, enum page_type type)
 {
 	enum page_type btype = PAGE_TYPE_OF_BIO(type);
 	struct f2fs_bio_info *io = &sbi->write_io[btype];
 	bool ret;
 
 	down_read(&io->io_rwsem);
-	ret = __has_merged_page(io, inode, page, ino);
+	ret = __has_merged_page(io, inode, ino, idx);
 	up_read(&io->io_rwsem);
 	return ret;
 }
 
 static void __f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
-				struct inode *inode, struct page *page,
-				nid_t ino, enum page_type type, int rw)
+				struct inode *inode, nid_t ino, pgoff_t idx,
+				enum page_type type, int rw)
 {
 	enum page_type btype = PAGE_TYPE_OF_BIO(type);
 	struct f2fs_bio_info *io;
@@ -299,7 +299,7 @@ static void __f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
 
 	down_write(&io->io_rwsem);
 
-	if (!__has_merged_page(io, inode, page, ino))
+	if (!__has_merged_page(io, inode, ino, idx))
 		goto out;
 
 	/* change META to META_FLUSH in the checkpoint procedure */
@@ -318,15 +318,15 @@ static void __f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
 void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, enum page_type type,
 									int rw)
 {
-	__f2fs_submit_merged_bio(sbi, NULL, NULL, 0, type, rw);
+	__f2fs_submit_merged_bio(sbi, NULL, 0, 0, type, rw);
 }
 
 void f2fs_submit_merged_bio_cond(struct f2fs_sb_info *sbi,
-				struct inode *inode, struct page *page,
-				nid_t ino, enum page_type type, int rw)
+				struct inode *inode, nid_t ino, pgoff_t idx,
+				enum page_type type, int rw)
 {
-	if (has_merged_page(sbi, inode, page, ino, type))
-		__f2fs_submit_merged_bio(sbi, inode, page, ino, type, rw);
+	if (has_merged_page(sbi, inode, ino, idx, type))
+		__f2fs_submit_merged_bio(sbi, inode, ino, idx, type, rw);
 }
 
 void f2fs_flush_merged_bios(struct f2fs_sb_info *sbi)
@@ -1428,7 +1428,8 @@ static int f2fs_write_data_page(struct page *page,
 		ClearPageUptodate(page);
 
 	if (wbc->for_reclaim) {
-		f2fs_submit_merged_bio_cond(sbi, NULL, page, 0, DATA, WRITE);
+		f2fs_submit_merged_bio_cond(sbi, inode, 0, page->index,
+						DATA, WRITE);
 		remove_dirty_inode(inode);
 	}
 
@@ -1464,6 +1465,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
 	pgoff_t index;
 	pgoff_t end;		/* Inclusive */
 	pgoff_t done_index;
+	pgoff_t last_idx = 0;
 	int cycled;
 	int range_whole = 0;
 	int tag;
@@ -1553,6 +1555,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
 				break;
 			} else {
 				nwritten++;
+				last_idx = page->index;
 			}
 
 			if (--wbc->nr_to_write <= 0 &&
@@ -1576,7 +1579,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
 
 	if (nwritten)
 		f2fs_submit_merged_bio_cond(F2FS_M_SB(mapping), mapping->host,
-							NULL, 0, DATA, WRITE);
+						0, last_idx, DATA, WRITE);
 
 	return ret;
 }
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 23b34d01e454..f01a73198176 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2224,8 +2224,8 @@ void destroy_checkpoint_caches(void);
 void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, enum page_type type,
 			int rw);
 void f2fs_submit_merged_bio_cond(struct f2fs_sb_info *sbi,
-				struct inode *inode, struct page *page,
-				nid_t ino, enum page_type type, int rw);
+				struct inode *inode, nid_t ino, pgoff_t idx,
+				enum page_type type, int rw);
 void f2fs_flush_merged_bios(struct f2fs_sb_info *sbi);
 int f2fs_submit_page_bio(struct f2fs_io_info *fio);
 int f2fs_submit_page_mbio(struct f2fs_io_info *fio);
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 69c38a0022e7..c573954571dd 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1321,7 +1321,7 @@ static struct page *last_fsync_dnode(struct f2fs_sb_info *sbi, nid_t ino)
 int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
 			struct writeback_control *wbc, bool atomic)
 {
-	pgoff_t index, end;
+	pgoff_t index, end, last_idx;
 	struct pagevec pvec;
 	int ret = 0;
 	struct page *last_page = NULL;
@@ -1404,6 +1404,7 @@ int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
 				break;
 			} else {
 				nwritten++;
+				last_idx = page->index;
 			}
 
 			if (page == last_page) {
@@ -1430,7 +1431,8 @@ int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
 	}
 out:
 	if (nwritten)
-		f2fs_submit_merged_bio_cond(sbi, NULL, NULL, ino, NODE, WRITE);
+		f2fs_submit_merged_bio_cond(sbi, NULL, ino, last_idx,
+							NODE, WRITE);
 	return ret ? -EIO: 0;
 }
 
@@ -1629,7 +1631,8 @@ static int f2fs_write_node_page(struct page *page,
 	up_read(&sbi->node_write);
 
 	if (wbc->for_reclaim)
-		f2fs_submit_merged_bio_cond(sbi, NULL, page, 0, NODE, WRITE);
+		f2fs_submit_merged_bio_cond(sbi, page->mapping->host, 0,
+						page->index, NODE, WRITE);
 
 	unlock_page(page);
 
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 3f56f709012a..984d94efe8cb 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -264,6 +264,7 @@ static int __commit_inmem_pages(struct inode *inode,
 		.encrypted_page = NULL,
 	};
 	bool submit_bio = false;
+	pgoff_t last_idx;
 	int err = 0;
 
 	list_for_each_entry_safe(cur, tmp, &fi->inmem_pages, list) {
@@ -291,13 +292,15 @@ static int __commit_inmem_pages(struct inode *inode,
 			cur->old_addr = fio.old_blkaddr;
 
 			submit_bio = true;
+			last_idx = page->index;
 		}
 		unlock_page(page);
 		list_move_tail(&cur->list, revoke_list);
 	}
 
 	if (submit_bio)
-		f2fs_submit_merged_bio_cond(sbi, inode, NULL, 0, DATA, WRITE);
+		f2fs_submit_merged_bio_cond(sbi, inode, 0, last_idx,
+							DATA, WRITE);
 
 	if (!err)
 		__revoke_inmem_pages(inode, revoke_list, false, false);
@@ -1917,7 +1920,8 @@ void f2fs_wait_on_page_writeback(struct page *page,
 	if (PageWriteback(page)) {
 		struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 
-		f2fs_submit_merged_bio_cond(sbi, NULL, page, 0, type, WRITE);
+		f2fs_submit_merged_bio_cond(sbi, page->mapping->host,
+						0, page->index, type, WRITE);
 		if (ordered)
 			wait_on_page_writeback(page);
 		else
-- 
2.11.0

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[PATCH 2/5] f2fs: check last page index in cached bio to decide submission Jaegeuk Kim <jaegeuk@kernel.org> - 2017-02-04 00:50 +0100

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