On Tue, Jun 05, 2018 at 09:16:05AM -0700, Darrick J. Wong wrote: > From: Darrick J. Wong <darrick.wong@xxxxxxxxxx> > > Swap files require that all the file mapping metadata be stable on disk. > It is insufficient to flush dirty pages in the page cache because that > won't necessarily result in filesystems pushing all their metadata out > to disk. Therefore, call fsync from iomap_swapfile_activate. > > Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> > --- > fs/iomap.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/fs/iomap.c b/fs/iomap.c > index 206539d369a8..48622bbbd751 100644 > --- a/fs/iomap.c > +++ b/fs/iomap.c > @@ -1387,7 +1387,11 @@ int iomap_swapfile_activate(struct swap_info_struct *sis, > loff_t len = ALIGN_DOWN(i_size_read(inode), PAGE_SIZE); > loff_t ret; > > - ret = filemap_write_and_wait(inode->i_mapping); > + /* > + * Persist all file mapping metadata so that we won't have any > + * IOMAP_F_DIRTY iomaps. > + */ > + ret = vfs_fsync(swap_file, 0); datasync semantics should be more than enough, so you can pass 1 here..
