In gfs2_file_write_iter, for direct writes, the error checking in the buffered
write fallback case is incomplete. This can cause inode write errors to go
undetected. Fix and clean up gfs2_file_write_iter along the way.
Based on a proposed fix by Christoph Hellwig <hch@lst.de>.
Fixes: d11a253b7541 ("gfs2: iomap direct I/O support") Cc: stable@vger.kernel.org # v4.19+ Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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