As an attempt to perform the page truncation more optimally, the
hole-punching support added in 223df0161f
truncated performed the operation in two steps: first, sub-page "stubs"
were zeroed under the range lock in zfs_free_range() using the new
zfs_zero_partial_page() function and then the whole pages were truncated
within zfs_freesp(). This left a window of opportunity during which
the full pages could be touched.
This patch closes the window by moving the whole-page truncation into
zfs_free_range() under the range lock.
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2733
cb08f06307