LU-12477 llite: use generic_error_remove_page()

lustre's internal ll_invalidate_page() is behaviourally identical to
generic_error_remove_page().
In the case of lustre it isn't a memory hardware error that requires
the page being invalidated, it is the loss of a lock, which will likely
result in the data changing on the server.
In either case, we don't want the page to be accessed any more, so the
same removal is appropriate.

Linux-commit: d5419b40599b4d6e030695dad30f15347679be66

Change-Id: I92686b5332eec02580563c1bee779688e8e591a3
Acked-by: Oleg Drokin <[email protected]>
Signed-off-by: NeilBrown <[email protected]>
Reviewed-on: https://review.whamcloud.com/35461
Tested-by: jenkins <[email protected]>
Reviewed-by: Lai Siyao <[email protected]>
Tested-by: Maloo <[email protected]>
Reviewed-by: Oleg Drokin <[email protected]>

Author: NeilBrown

lustre/llite/llite_internal.h

@@ -1142,23 +1142,6 @@ void policy_from_vma(union ldlm_policy_data *policy, struct vm_area_struct *vma,
 struct vm_area_struct *our_vma(struct mm_struct *mm, unsigned long addr,
                                size_t count);
 
-static inline void ll_invalidate_page(struct page *vmpage)
-{
-	struct address_space *mapping = vmpage->mapping;
-	loff_t offset = vmpage->index << PAGE_SHIFT;
-
-	LASSERT(PageLocked(vmpage));
-	if (mapping == NULL)
-		return;
-
-	/*
-	 * truncate_complete_page() calls
-	 * a_ops->invalidatepage()->cl_page_delete()->vvp_page_delete().
-	 */
-	ll_teardown_mmaps(mapping, offset, offset + PAGE_SIZE);
-	truncate_complete_page(mapping, vmpage);
-}
-
 #define    ll_s2sbi(sb)        (s2lsi(sb)->lsi_llsbi)
 
 /* don't need an addref as the sb_info should be holding one */

lustre/llite/vvp_io.c

@@ -1239,7 +1239,7 @@ static int vvp_io_fault_start(const struct lu_env *env,
 	LASSERT(PageLocked(vmpage));
 
 	if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_FAULT_TRUNC_RACE))
-		ll_invalidate_page(vmpage);
+		generic_error_remove_page(vmpage->mapping, vmpage);
 
 	size = i_size_read(inode);
         /* Though we have already held a cl_lock upon this page, but

lustre/llite/vvp_page.c

@@ -153,7 +153,7 @@ static void vvp_page_discard(const struct lu_env *env,
 	if (vpg->vpg_defer_uptodate && !vpg->vpg_ra_used)
 		ll_ra_stats_inc(vmpage->mapping->host, RA_STAT_DISCARDED);
 
-	ll_invalidate_page(vmpage);
+	generic_error_remove_page(vmpage->mapping, vmpage);
 }
 
 static void vvp_page_delete(const struct lu_env *env,
@@ -281,7 +281,7 @@ static void vvp_page_completion_read(const struct lu_env *env,
 			/* mirror read failed, it needs to destroy the page
 			 * because subpage would be from wrong osc when trying
 			 * to read from a new mirror */
-			ll_invalidate_page(vmpage);
+			generic_error_remove_page(vmpage->mapping, vmpage);
 		}
 	}