[PATCH 6.1 199/217] nilfs2: fix potential kernel bug due to lack of writeback flag waiting

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>

commit a4ca369ca221bb7e06c725792ac107f0e48e82e7 upstream.

Destructive writes to a block device on which nilfs2 is mounted can cause
a kernel bug in the folio/page writeback start routine or writeback end
routine (__folio_start_writeback in the log below):

 kernel BUG at mm/page-writeback.c:3070!
 Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
 ...
 RIP: 0010:__folio_start_writeback+0xbaa/0x10e0
 Code: 25 ff 0f 00 00 0f 84 18 01 00 00 e8 40 ca c6 ff e9 17 f6 ff ff
  e8 36 ca c6 ff 4c 89 f7 48 c7 c6 80 c0 12 84 e8 e7 b3 0f 00 90 <0f>
  0b e8 1f ca c6 ff 4c 89 f7 48 c7 c6 a0 c6 12 84 e8 d0 b3 0f 00
 ...
 Call Trace:
  <TASK>
  nilfs_segctor_do_construct+0x4654/0x69d0 [nilfs2]
  nilfs_segctor_construct+0x181/0x6b0 [nilfs2]
  nilfs_segctor_thread+0x548/0x11c0 [nilfs2]
  kthread+0x2f0/0x390
  ret_from_fork+0x4b/0x80
  ret_from_fork_asm+0x1a/0x30
  </TASK>

This is because when the log writer starts a writeback for segment summary
blocks or a super root block that use the backing device's page cache, it
does not wait for the ongoing folio/page writeback, resulting in an
inconsistent writeback state.

Fix this issue by waiting for ongoing writebacks when putting
folios/pages on the backing device into writeback state.

Link: https://lkml.kernel.org/r/20240530141556.4411-1-konishi.ryusuke@xxxxxxxxx
Fixes: 9ff05123e3bf ("nilfs2: segment constructor")
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Tested-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/nilfs2/segment.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1692,6 +1692,7 @@ static void nilfs_segctor_prepare_write(
 			if (bh->b_page != bd_page) {
 				if (bd_page) {
 					lock_page(bd_page);
+					wait_on_page_writeback(bd_page);
 					clear_page_dirty_for_io(bd_page);
 					set_page_writeback(bd_page);
 					unlock_page(bd_page);
@@ -1705,6 +1706,7 @@ static void nilfs_segctor_prepare_write(
 			if (bh == segbuf->sb_super_root) {
 				if (bh->b_page != bd_page) {
 					lock_page(bd_page);
+					wait_on_page_writeback(bd_page);
 					clear_page_dirty_for_io(bd_page);
 					set_page_writeback(bd_page);
 					unlock_page(bd_page);
@@ -1721,6 +1723,7 @@ static void nilfs_segctor_prepare_write(
 	}
 	if (bd_page) {
 		lock_page(bd_page);
+		wait_on_page_writeback(bd_page);
 		clear_page_dirty_for_io(bd_page);
 		set_page_writeback(bd_page);
 		unlock_page(bd_page);






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