[f2fs-dev] Patch "f2fs: fix to wait on block writeback for post_read case" has been added to the 5.15-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    f2fs: fix to wait on block writeback for post_read case

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     f2fs-fix-to-wait-on-block-writeback-for-post_read-case.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From stable+bounces-225733-greg=kroah.com@vger.kernel.org Tue Mar 17 03:41:01 2026
From: Robert Garcia <rob_garcia@163.com>
Date: Tue, 17 Mar 2026 10:39:33 +0800
Subject: f2fs: fix to wait on block writeback for post_read case
To: stable@vger.kernel.org, Chao Yu <chao@kernel.org>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>, linux-f2fs-devel@lists.sourceforge.net, Robert Garcia <rob_garcia@163.com>, linux-kernel@vger.kernel.org
Message-ID: <20260317023933.1654240-1-rob_garcia@163.com>

From: Chao Yu <chao@kernel.org>

[ 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@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
[ Minor context change fixed. ]
Signed-off-by: Robert Garcia <rob_garcia@163.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/f2fs/data.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2537,9 +2537,6 @@ int f2fs_encrypt_one_page(struct f2fs_io
 
 	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 @@ got_it:
 		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.


Patches currently in stable-queue which might be from rob_garcia@163.com are

queue-5.15/sunrpc-lock-against-sock-changing-during-sysfs-read.patch
queue-5.15/smb-client-fix-potential-uaf-in-smb2_is_valid_oplock.patch
queue-5.15/pstore-inode-only-d_invalidate-is-needed.patch
queue-5.15/wifi-iwlwifi-read-txq-read_ptr-under-lock.patch
queue-5.15/alsa-control-avoid-warn-for-symlink-errors.patch
queue-5.15/binfmt_misc-restore-write-access-before-closing-files-opened-by-open_exec.patch
queue-5.15/spi-cadence-quadspi-implement-refcount-to-handle-unbind-during-busy.patch
queue-5.15/f2fs-fix-to-wait-on-block-writeback-for-post_read-case.patch


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