Commit 98bb45e resolved a deadlock which could occur when
handling a page fault in zfs_write(). This change added
the uio_fault_disable field to the uio structure but failed
to initialize it to B_FALSE. This uninitialized field would
cause uiomove_iov() to call __copy_from_user_inatomic()
instead of copy_from_user() resulting in unexpected EFAULTs.
Resolve the issue by fully initializing the uio, and clearing
the uio_fault_disable flags after it's used in zfs_write().
Additionally, reorder the uio_t field assignments to match
the order the fields are declared in the structure.
Reviewed-by: Chunwei Chen <tuxoko@gmail.com>
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#8640Closes#8719
515ddf6504