tree 5514fcd695413fddddab5f833827b0e6eec17002
parent 67a11611e1a5211f6569044fbf8150875764d1d0
author yangerkun <yangerkun@huawei.com> 1549861524 -0500
committer Theodore Ts'o <tytso@mit.edu> 1549861524 -0500

ext4: cleanup pagecache before swap i_data

While do swap, we should make sure there has no new dirty page since we
should swap i_data between two inode:
1.We should lock i_mmap_sem with write to avoid new pagecache from mmap
read/write;
2.Change filemap_flush to filemap_write_and_wait and move them to the
space protected by inode lock to avoid new pagecache from buffer read/write.

Signed-off-by: yangerkun <yangerkun@huawei.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org