f2fs: should avoid inode eviction in synchronous path

https://bugzilla.kernel.org/show_bug.cgi?id=208565

PID: 257    TASK: ecdd0000  CPU: 0   COMMAND: "init"
  #0 [<c0b420ec>] (__schedule) from [<c0b423c8>]
  #1 [<c0b423c8>] (schedule) from [<c0b459d4>]
  #2 [<c0b459d4>] (rwsem_down_read_failed) from [<c0b44fa0>]
  #3 [<c0b44fa0>] (down_read) from [<c044233c>]
  #4 [<c044233c>] (f2fs_truncate_blocks) from [<c0442890>]
  #5 [<c0442890>] (f2fs_truncate) from [<c044d408>]
  #6 [<c044d408>] (f2fs_evict_inode) from [<c030be18>]
  #7 [<c030be18>] (evict) from [<c030a558>]
  #8 [<c030a558>] (iput) from [<c047c600>]
  #9 [<c047c600>] (f2fs_sync_node_pages) from [<c0465414>]
 #10 [<c0465414>] (f2fs_write_checkpoint) from [<c04575f4>]
 #11 [<c04575f4>] (f2fs_sync_fs) from [<c0441918>]
 #12 [<c0441918>] (f2fs_do_sync_file) from [<c0441098>]
 #13 [<c0441098>] (f2fs_sync_file) from [<c0323fa0>]
 #14 [<c0323fa0>] (vfs_fsync_range) from [<c0324294>]
 #15 [<c0324294>] (do_fsync) from [<c0324014>]
 #16 [<c0324014>] (sys_fsync) from [<c0108bc0>]

This can be caused by flush_dirty_inode() in f2fs_sync_node_pages() where
iput() requires f2fs_lock_op() again resulting in livelock.

Reported-by: Zhiguo Niu <Zhiguo.Niu@unisoc.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 85ebdd0e3e7c09a436339dc0f32a3f3181565a8d..3ffe8d83f29f409d943181bc4b65e410a74a498f 100644 (file)
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1926,8 +1926,12 @@ continue_unlock:
                                goto continue_unlock;
                        }
 
-                       /* flush inline_data, if it's async context. */
-                       if (do_balance && is_inline_node(page)) {
+                       /* flush inline_data/inode, if it's async context. */
+                       if (!do_balance)
+                               goto write_node;
+
+                       /* flush inline_data */
+                       if (is_inline_node(page)) {
                                clear_inline_node(page);
                                unlock_page(page);
                                flush_inline_data(sbi, ino_of_node(page));
@@ -1940,7 +1944,7 @@ continue_unlock:
                                if (flush_dirty_inode(page))
                                        goto lock_node;
                        }
-
+write_node:
                        f2fs_wait_on_page_writeback(page, NODE, true, true);
 
                        if (!clear_page_dirty_for_io(page))