On Thu, 6 Aug 2015, Yan, Zheng wrote:
> On Thu, Aug 6, 2015 at 5:26 AM, Sage Weil <sw...@redhat.com> wrote:
> > Today I learned that syncfs(2) does an O(n) search of the superblock's
> > inode list searching for dirty items. I've always assumed that it was
> > only traversing dirty inodes (e.g., a list of dirty inodes), but that
> > appears not to be the case, even on the latest kernels.
> >
>
> I checked syncfs code in 3.10/4.1 kernel. I think both kernels only
> traverse dirty inodes (inodes in
> bdi_writeback::{b_dirty,b_io,b_more_io} lists). what am I missing?
See wait_sb_inodes in fs/fs-writeback.c, called by sync_inodes_sb.
sage
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