LU-16160 llite: clear stale page's uptodate bit

LU-16160 llite: clear stale page's uptodate bit

With truncate_inode_page()->do_invalidatepage()->ll_invalidatepage()
call path before deleting vmpage from page cache, the page could be
possibly picked up by ll_read_ahead_page()->grab_cache_page_nowait().

If ll_invalidatepage()->cl_page_delete() does not clear the vmpage's
uptodate bit, the read ahead could pick it up and think it's already
uptodate wrongly.

In ll_fault()->vvp_io_fault_start()->vvp_io_kernel_fault(), the
filemap_fault() will call ll_readpage() to read vmpage and wait for
the unlock of the vmpage, and when ll_readpage() successfully read
the vmpage then unlock the vmpage, memory pressure or truncate can
get in and delete the cl_page, afterward filemap_fault() find that
the vmpage is not uptodate and VM_FAULT_SIGBUS got returned. To fix
this situation, this patch makes vvp_io_kernel_fault() restart
filemap_fault() to get uptodated vmpage again.

Test-Parameters: testlist=sanityn env=ONLY="16f",ONLY_REPEAT=50
Test-Parameters: testlist=sanityn env=ONLY="16g",ONLY_REPEAT=50
Test-Parameters: testlist=sanityn env=ONLY="16f 16g",ONLY_REPEAT=50
Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: I369e1362ffb071ec0a4de3cd5bad27a87cff5e05
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/48607
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>