Bugfix/fix uio partial copies

In zfs_write(), the loop continues to the next iteration without
accounting for partial copies occurring in uiomove_iov when 
copy_from_user/__copy_from_user_inatomic return a non-zero status.
This results in "zfs: accessing past end of object..." in the 
kernel log, and the write failing.

Account for partial copies and update uio struct before returning
EFAULT, leave a comment explaining the reason why this is done.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: ilbsmart <[email protected]>
Signed-off-by: Fabio Scaccabarozzi <[email protected]>
Closes #8673 
Closes #10148 

0 files changed, 0 insertions, 0 deletions