If the s_umount is write locked, then the sb is not idle. IOWs,
writeback_inodes_sb...if_idle() should be doing down_read_trylock(),
not down_read(). So use try_to_writeback_inodes_sb() instead of
writeback_inodes_sb_if_idle().
Signed-off-by: Miao Xie <[email protected]>
---
fs/ext4/inode.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index c77b0bd..2dccb4d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2380,7 +2380,7 @@ static int ext4_nonda_switch(struct super_block *sb)
* start pushing delalloc when 1/2 of free blocks are dirty.
*/
if (free_blocks < 2 * dirty_blocks)
- writeback_inodes_sb_if_idle(sb, WB_REASON_FS_FREE_SPACE);
+ try_to_writeback_inodes_sb(sb, WB_REASON_FS_FREE_SPACE);
return 0;
}
--
1.7.6.5