[PATCH v6 02/12] f2fs: cache: initialize meta cache

[Chao Yu <chao@kernel.org>]

From: Chao Yu <chao@kernel.org>

This patch introduces meta_blocks in f2fs_sb_info structure, initializes
and destroys the meta cache during filesystem mount and unmount.

It also introduces helper wrappers for meta cache operation.

Signed-off-by: Chao Yu <chao@kernel.org>
---
 fs/f2fs/cache.h | 12 ++++++++++++
 fs/f2fs/data.c  |  3 +++
 fs/f2fs/f2fs.h  |  3 +++
 fs/f2fs/super.c | 10 +++++++++-
 4 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/cache.h b/fs/f2fs/cache.h
index 3c902cbae5b3..6408f8cb5723 100644
--- a/fs/f2fs/cache.h
+++ b/fs/f2fs/cache.h
@@ -193,4 +193,16 @@ void f2fs_truncate_cache(struct f2fs_cached_block *entry, bool drop_dirty);
 void f2fs_drop_cache_range(struct f2fs_cached_block_list *cache,
 		unsigned long start, unsigned long len, bool drop_dirty);
 
+int f2fs_start_cache_wb_thread(struct f2fs_sb_info *sbi);
+void f2fs_stop_cache_wb_thread(struct f2fs_sb_info *sbi);
+
+#define META_CACHE(sbi)		(&(sbi)->meta_blocks)
+
+#define f2fs_find_meta_cache(sbi, blkaddr)		\
+	f2fs_find_cache(META_CACHE(sbi), blkaddr)
+#define f2fs_invalidate_meta_caches(sbi, start, len)	\
+	f2fs_drop_cache_range(META_CACHE(sbi), start, len, false)
+#define f2fs_truncate_meta_caches(sbi, start, len)	\
+	f2fs_drop_cache_range(META_CACHE(sbi), start, len, true)
+
 #endif /* _LINUX_F2FS_CACHE_H */
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index d9fe1bba75d6..7b7f7be3f0ed 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -669,6 +669,9 @@ static bool __has_merged_page(struct f2fs_sb_info *sbi, struct bio *bio,
 	if (!inode && !folio && !ino)
 		return true;
 
+	if (f2fs_is_cache_bio(bio))
+		return false;
+
 	bio_for_each_folio_all(fi, bio) {
 		struct folio *target = fi.folio;
 
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 81f1bcc58cd3..8bce5cc2b09a 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2107,6 +2107,9 @@ struct f2fs_sb_info {
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 	struct lock_class_key cp_global_sem_key;
 #endif
+
+	/* f2fs internal cache */
+	struct f2fs_cached_block_list meta_blocks;
 };
 
 /* Definitions to access f2fs_sb_info */
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index f96abecb3c55..f6ac2a56b0da 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2094,6 +2094,8 @@ static void f2fs_put_super(struct super_block *sb)
 	iput(sbi->meta_inode);
 	sbi->meta_inode = NULL;
 
+	f2fs_destroy_cache(META_CACHE(sbi));
+
 	/* Should check the page counts after dropping all node/meta pages */
 	for (i = 0; i < NR_COUNT_TYPE; i++) {
 		if (!get_pages(sbi, i))
@@ -5261,12 +5263,16 @@ static int f2fs_fill_super(struct super_block *sb, struct fs_context *fc)
 	if (err)
 		goto free_percpu;
 
+	err = f2fs_init_cache(sbi, META_CACHE(sbi), F2FS_META_CACHE);
+	if (err)
+		goto free_page_array_cache;
+
 	/* get an inode for meta space */
 	sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
 	if (IS_ERR(sbi->meta_inode)) {
 		f2fs_err(sbi, "Failed to read F2FS meta data inode");
 		err = PTR_ERR(sbi->meta_inode);
-		goto free_page_array_cache;
+		goto free_meta_cache;
 	}
 
 	err = f2fs_get_valid_checkpoint(sbi);
@@ -5594,6 +5600,8 @@ static int f2fs_fill_super(struct super_block *sb, struct fs_context *fc)
 	make_bad_inode(sbi->meta_inode);
 	iput(sbi->meta_inode);
 	sbi->meta_inode = NULL;
+free_meta_cache:
+	f2fs_destroy_cache(META_CACHE(sbi));
 free_page_array_cache:
 	f2fs_destroy_page_array_cache(sbi);
 free_percpu:
-- 
2.49.0