[PATCH v3 1/2] f2fs: use meta inode for GC of atomic file

[PATCH v3 1/2] f2fs: use meta inode for GC of atomic file

[Sunmin Jeong]

The page cache of the atomic file keeps new data pages which will be
stored in the COW file. It can also keep old data pages when GCing the
atomic file. In this case, new data can be overwritten by old data if a
GC thread sets the old data page as dirty after new data page was
evicted.

Also, since all writes to the atomic file are redirected to COW inodes,
GC for the atomic file is not working well as below.

f2fs_gc(gc_type=FG_GC)
  - select A as a victim segment
  do_garbage_collect
    - iget atomic file's inode for block B
    move_data_page
      f2fs_do_write_data_page
        - use dn of cow inode
        - set fio->old_blkaddr from cow inode
    - seg_freed is 0 since block B is still valid
  - goto gc_more and A is selected as victim again

To solve the problem, let's separate GC writes and updates in the atomic
file by using the meta inode for GC writes.

Fixes: 3db1de0e582c ("f2fs: change the current atomic write way")
Cc: stable@vger.kernel.org #v5.19+
Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
Reviewed-by: Yeongjin Gil <youngjin.gil@samsung.com>
Signed-off-by: Sunmin Jeong <s_min.jeong@samsung.com>
Reviewed-by: Chao Yu <chao@kernel.org>
---
v2:
- replace post_read to meta_gc

 fs/f2fs/data.c    | 4 ++--
 fs/f2fs/f2fs.h    | 7 ++++++-
 fs/f2fs/gc.c      | 6 +++---
 fs/f2fs/segment.c | 6 +++---
 4 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index b6dcb3bcaef7..9a213d03005d 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2693,7 +2693,7 @@ int f2fs_do_write_data_page(struct f2fs_io_info *fio)
 	}
 
 	/* wait for GCed page writeback via META_MAPPING */
-	if (fio->post_read)
+	if (fio->meta_gc)
 		f2fs_wait_on_block_writeback(inode, fio->old_blkaddr);
 
 	/*
@@ -2788,7 +2788,7 @@ int f2fs_write_single_data_page(struct page *page, int *submitted,
 		.submitted = 0,
 		.compr_blocks = compr_blocks,
 		.need_lock = compr_blocks ? LOCK_DONE : LOCK_RETRY,
-		.post_read = f2fs_post_read_required(inode) ? 1 : 0,
+		.meta_gc = f2fs_meta_inode_gc_required(inode) ? 1 : 0,
 		.io_type = io_type,
 		.io_wbc = wbc,
 		.bio = bio,
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index f7ee6c5e371e..796ae11c0fa3 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1211,7 +1211,7 @@ struct f2fs_io_info {
 	unsigned int in_list:1;		/* indicate fio is in io_list */
 	unsigned int is_por:1;		/* indicate IO is from recovery or not */
 	unsigned int encrypted:1;	/* indicate file is encrypted */
-	unsigned int post_read:1;	/* require post read */
+	unsigned int meta_gc:1;		/* require meta inode GC */
 	enum iostat_type io_type;	/* io type */
 	struct writeback_control *io_wbc; /* writeback control */
 	struct bio **bio;		/* bio for ipu */
@@ -4263,6 +4263,11 @@ static inline bool f2fs_post_read_required(struct inode *inode)
 		f2fs_compressed_file(inode);
 }
 
+static inline bool f2fs_meta_inode_gc_required(struct inode *inode)
+{
+	return f2fs_post_read_required(inode) || f2fs_is_atomic_file(inode);
+}
+
 /*
  * compress.c
  */
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index ef667fec9a12..cb3006551ab5 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1589,7 +1589,7 @@ static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 			start_bidx = f2fs_start_bidx_of_node(nofs, inode) +
 								ofs_in_node;
 
-			if (f2fs_post_read_required(inode)) {
+			if (f2fs_meta_inode_gc_required(inode)) {
 				int err = ra_data_block(inode, start_bidx);
 
 				f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
@@ -1640,7 +1640,7 @@ static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 
 			start_bidx = f2fs_start_bidx_of_node(nofs, inode)
 								+ ofs_in_node;
-			if (f2fs_post_read_required(inode))
+			if (f2fs_meta_inode_gc_required(inode))
 				err = move_data_block(inode, start_bidx,
 							gc_type, segno, off);
 			else
@@ -1648,7 +1648,7 @@ static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 								segno, off);
 
 			if (!err && (gc_type == FG_GC ||
-					f2fs_post_read_required(inode)))
+					f2fs_meta_inode_gc_required(inode)))
 				submitted++;
 
 			if (locked) {
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 4db1add43e36..77ef46b384b4 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3851,7 +3851,7 @@ int f2fs_inplace_write_data(struct f2fs_io_info *fio)
 		goto drop_bio;
 	}
 
-	if (fio->post_read)
+	if (fio->meta_gc)
 		f2fs_truncate_meta_inode_pages(sbi, fio->new_blkaddr, 1);
 
 	stat_inc_inplace_blocks(fio->sbi);
@@ -4021,7 +4021,7 @@ void f2fs_wait_on_block_writeback(struct inode *inode, block_t blkaddr)
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	struct page *cpage;
 
-	if (!f2fs_post_read_required(inode))
+	if (!f2fs_meta_inode_gc_required(inode))
 		return;
 
 	if (!__is_valid_data_blkaddr(blkaddr))
@@ -4040,7 +4040,7 @@ void f2fs_wait_on_block_writeback_range(struct inode *inode, block_t blkaddr,
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	block_t i;
 
-	if (!f2fs_post_read_required(inode))
+	if (!f2fs_meta_inode_gc_required(inode))
 		return;
 
 	for (i = 0; i < len; i++)
-- 
2.25.1

Re: [f2fs-dev] [PATCH v3 1/2] f2fs: use meta inode for GC of atomic file

[patchwork-bot+f2fs]

Hello:

This series was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <jaegeuk@kernel.org>:

On Wed, 10 Jul 2024 20:51:17 +0900 you wrote:
> The page cache of the atomic file keeps new data pages which will be
> stored in the COW file. It can also keep old data pages when GCing the
> atomic file. In this case, new data can be overwritten by old data if a
> GC thread sets the old data page as dirty after new data page was
> evicted.
> 
> Also, since all writes to the atomic file are redirected to COW inodes,
> GC for the atomic file is not working well as below.
> 
> [...]

Here is the summary with links:
  - [f2fs-dev,v3,1/2] f2fs: use meta inode for GC of atomic file
    https://git.kernel.org/jaegeuk/f2fs/c/b40a2b003709
  - [f2fs-dev,v3,2/2] f2fs: use meta inode for GC of COW file
    https://git.kernel.org/jaegeuk/f2fs/c/f18d00769336

You are awesome, thank you!
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