On 21/09/2020 16:44, Goldwyn Rodrigues wrote: > From: Christoph Hellwig <hch@xxxxxx> > > This is to avoid the deadlock caused in btrfs because of O_DIRECT | > O_DSYNC. > > Filesystems such as btrfs require i_rwsem while performing sync on a > file. iomap_dio_rw() is called under i_rw_sem. This leads to a > deadlock because of: > > iomap_dio_complete() > generic_write_sync() > btrfs_sync_file() > > Separate out iomap_dio_complete() from iomap_dio_rw(), so filesystems > can call iomap_dio_complete() after unlocking i_rwsem. > > Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx> > This is missing Christoph's S-o-b
