Question about bdi writeback and __filemap_fdatawrite_range()

[Peng Tao]

Hi,

There are three lists in struct bdi_writeback, b_dirty, b_io and
b_more_io. Once an inode is dirtied, it will be put in b_dirty list.
And once it gets written back, it gets out of the b_io list. And my
question is, if __filemap_fdatawrite_range() kicks off the writeback,
and writes all dirty pages in the inode, how is the inode supposed to
leave the bdi writeback list? I mean, writeback_inodes_wb() will add
the inode to the b_dirty list if no page is written back w/
writeback_single_inode (which is sure, because no dirty page is left).

Is there some piece of code that I am missing?

-- 
Thanks,
-Bergwolf
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