Here's a patch that implements direct I/O for inline data. Direct I/O to inline data is a bit weird because it's not direct in the usual sense, but since Christoph's been asking for it ... The usual alignment restrictions to the logical block size of the underlying block device still apply. I don't see a reason for changing that; the resulting behavior would only become very weird for no benefit. I've tested this against a hacked-up version of gfs2. However, the "real" gfs2 will keep falling back to buffered I/O for writes to inline data: gfs2 takes a shared lock during direct I/O, and writing to the inode under that shared lock is not allowed. Ext4 may become the first actual user of this part of the patch. Thanks, Andreas Andreas Gruenbacher (1): iomap: Direct I/O to inline data fs/iomap.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) -- 2.17.1
