f2fs: avoid infinite loop to flush node pages

xfstests/generic/475 can give EIO all the time which give an infinite loop
to flush node page like below. Let's avoid it.

[16418.518551] Call Trace:
[16418.518553]  ? dm_submit_bio+0x48/0x400
[16418.518574]  ? submit_bio_checks+0x1ac/0x5a0
[16418.525207]  __submit_bio+0x1a9/0x230
[16418.525210]  ? kmem_cache_alloc+0x29e/0x3c0
[16418.525223]  submit_bio_noacct+0xa8/0x2b0
[16418.525226]  submit_bio+0x4d/0x130
[16418.525238]  __submit_bio+0x49/0x310 [f2fs]
[16418.525339]  ? bio_add_page+0x6a/0x90
[16418.525344]  f2fs_submit_page_bio+0x134/0x1f0 [f2fs]
[16418.525365]  read_node_page+0x125/0x1b0 [f2fs]
[16418.525388]  __get_node_page.part.0+0x58/0x3f0 [f2fs]
[16418.525409]  __get_node_page+0x2f/0x60 [f2fs]
[16418.525431]  f2fs_get_dnode_of_data+0x423/0x860 [f2fs]
[16418.525452]  ? asm_sysvec_apic_timer_interrupt+0x12/0x20
[16418.525458]  ? __mod_memcg_state.part.0+0x2a/0x30
[16418.525465]  ? __mod_memcg_lruvec_state+0x27/0x40
[16418.525467]  ? __xa_set_mark+0x57/0x70
[16418.525472]  f2fs_do_write_data_page+0x10e/0x7b0 [f2fs]
[16418.525493]  f2fs_write_single_data_page+0x555/0x830 [f2fs]
[16418.525514]  ? sysvec_apic_timer_interrupt+0x4e/0x90
[16418.525518]  ? asm_sysvec_apic_timer_interrupt+0x12/0x20
[16418.525523]  f2fs_write_cache_pages+0x303/0x880 [f2fs]
[16418.525545]  ? blk_flush_plug_list+0x47/0x100
[16418.525548]  f2fs_write_data_pages+0xfd/0x320 [f2fs]
[16418.525569]  do_writepages+0xd5/0x210
[16418.525648]  filemap_fdatawrite_wbc+0x7d/0xc0
[16418.525655]  filemap_fdatawrite+0x50/0x70
[16418.525658]  f2fs_sync_dirty_inodes+0xa4/0x230 [f2fs]
[16418.525679]  f2fs_write_checkpoint+0x16d/0x1720 [f2fs]
[16418.525699]  ? ttwu_do_wakeup+0x1c/0x160
[16418.525709]  ? ttwu_do_activate+0x6d/0xd0
[16418.525711]  ? __wait_for_common+0x11d/0x150
[16418.525715]  kill_f2fs_super+0xca/0x100 [f2fs]
[16418.525733]  deactivate_locked_super+0x3b/0xb0
[16418.525739]  deactivate_super+0x40/0x50
[16418.525741]  cleanup_mnt+0x139/0x190
[16418.525747]  __cleanup_mnt+0x12/0x20
[16418.525749]  task_work_run+0x6d/0xa0
[16418.525765]  exit_to_user_mode_prepare+0x1ad/0x1b0
[16418.525771]  syscall_exit_to_user_mode+0x27/0x50
[16418.525774]  do_syscall_64+0x48/0xc0
[16418.525776]  entry_SYSCALL_64_after_hwframe+0x44/0xae

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 12 insertions, 11 deletions

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 144f9f966690..51230cba841b 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1416,8 +1416,7 @@ repeat:
 
 	err = read_node_page(page, 0);
 	if (err < 0) {
-		f2fs_put_page(page, 1);
-		return ERR_PTR(err);
+		goto out_put_err;
 	} else if (err == LOCKED_PAGE) {
 		err = 0;
 		goto page_hit;
@@ -1443,19 +1442,21 @@ repeat:
 		goto out_err;
 	}
 page_hit:
-	if (unlikely(nid != nid_of_node(page))) {
-		f2fs_warn(sbi, "inconsistent node block, nid:%lu, node_footer[nid:%u,ino:%u,ofs:%u,cpver:%llu,blkaddr:%u]",
+	if (likely(nid == nid_of_node(page)))
+		return page;
+
+	f2fs_warn(sbi, "inconsistent node block, nid:%lu, node_footer[nid:%u,ino:%u,ofs:%u,cpver:%llu,blkaddr:%u]",
 			  nid, nid_of_node(page), ino_of_node(page),
 			  ofs_of_node(page), cpver_of_node(page),
 			  next_blkaddr_of_node(page));
-		set_sbi_flag(sbi, SBI_NEED_FSCK);
-		err = -EINVAL;
+	set_sbi_flag(sbi, SBI_NEED_FSCK);
+	err = -EINVAL;
 out_err:
-		ClearPageUptodate(page);
-		f2fs_put_page(page, 1);
-		return ERR_PTR(err);
-	}
-	return page;
+	ClearPageUptodate(page);
+out_put_err:
+	f2fs_handle_page_eio(sbi, page->index, NODE);
+	f2fs_put_page(page, 1);
+	return ERR_PTR(err);
 }
 
 struct page *f2fs_get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)