[PATCH 5.15.y] f2fs: fix to wait on block writeback for post_read case

[Robert Garcia]

From: Chao Yu <chao@xxxxxxxxxx>

[ Upstream commit 55fdc1c24a1d6229fe0ecf31335fb9a2eceaaa00 ]

If inode is compressed, but not encrypted, it missed to call
f2fs_wait_on_block_writeback() to wait for GCed page writeback
in IPU write path.

Thread A				GC-Thread
					- f2fs_gc
					 - do_garbage_collect
					  - gc_data_segment
					   - move_data_block
					    - f2fs_submit_page_write
					     migrate normal cluster's block via
					     meta_inode's page cache
- f2fs_write_single_data_page
 - f2fs_do_write_data_page
  - f2fs_inplace_write_data
   - f2fs_submit_page_bio

IRQ
- f2fs_read_end_io
					IRQ
					old data overrides new data due to
					out-of-order GC and common IO.
					- f2fs_read_end_io

Fixes: 4c8ff7095bef ("f2fs: support data compression")
Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
[ Minor context change fixed. ]
Signed-off-by: Robert Garcia <rob_garcia@xxxxxxx>
---
 fs/f2fs/data.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 887e286d2c32..39c633fa162c 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2537,9 +2537,6 @@ int f2fs_encrypt_one_page(struct f2fs_io_info *fio)
 
 	page = fio->compressed_page ? fio->compressed_page : fio->page;
 
-	/* wait for GCed page writeback via META_MAPPING */
-	f2fs_wait_on_block_writeback(inode, fio->old_blkaddr);
-
 	if (fscrypt_inode_uses_inline_crypto(inode))
 		return 0;
 
@@ -2718,6 +2715,11 @@ int f2fs_do_write_data_page(struct f2fs_io_info *fio)
 		err = -EFSCORRUPTED;
 		goto out_writepage;
 	}
+
+	/* wait for GCed page writeback via META_MAPPING */
+	if (fio->post_read)
+		f2fs_wait_on_block_writeback(inode, fio->old_blkaddr);
+
 	/*
 	 * If current allocation needs SSR,
 	 * it had better in-place writes for updated data.
-- 
2.34.1