vfs: add hooks for ext4's delayed allocation support
Export mpage_bio_submit() and __mpage_writepage() for the benefit of ext4's delayed allocation support. Also change __block_write_full_page so that if buffers that have the BH_Delay flag set it will call get_block() to get the physical block allocated, just as in the !BH_Mapped case. Signed-off-by: Alex Tomas <alex@clusterfs.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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