lustre: switch to kernel_write

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/staging/lustre/lnet/libcfs/tracefile.c

@@ -731,8 +731,7 @@ int cfs_tracefile_dump_all_pages(char *filename)
 		__LASSERT_TAGE_INVARIANT(tage);
 
 		buf = kmap(tage->page);
-		rc = vfs_write(filp, (__force const char __user *)buf,
-			       tage->used, &filp->f_pos);
+		rc = kernel_write(filp, buf, tage->used, &filp->f_pos);
 		kunmap(tage->page);
 
 		if (rc != (int)tage->used) {
@@ -976,7 +975,6 @@ static int tracefiled(void *arg)
 	struct tracefiled_ctl *tctl = arg;
 	struct cfs_trace_page *tage;
 	struct cfs_trace_page *tmp;
-	mm_segment_t __oldfs;
 	struct file *filp;
 	char *buf;
 	int last_loop = 0;
@@ -1014,8 +1012,6 @@ static int tracefiled(void *arg)
 			__LASSERT(list_empty(&pc.pc_pages));
 			goto end_loop;
 		}
-		__oldfs = get_fs();
-		set_fs(get_ds());
 
 		list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) {
 			static loff_t f_pos;
@@ -1028,8 +1024,7 @@ static int tracefiled(void *arg)
 				f_pos = i_size_read(file_inode(filp));
 
 			buf = kmap(tage->page);
-			rc = vfs_write(filp, (__force const char __user *)buf,
-				       tage->used, &f_pos);
+			rc = kernel_write(filp, buf, tage->used, &f_pos);
 			kunmap(tage->page);
 
 			if (rc != (int)tage->used) {
@@ -1040,7 +1035,6 @@ static int tracefiled(void *arg)
 				break;
 			}
 		}
-		set_fs(__oldfs);
 
 		filp_close(filp, NULL);
 		put_pages_on_daemon_list(&pc);

drivers/staging/lustre/lustre/obdclass/kernelcomm.c

@@ -52,7 +52,6 @@ int libcfs_kkuc_msg_put(struct file *filp, void *payload)
 	struct kuc_hdr *kuch = (struct kuc_hdr *)payload;
 	ssize_t count = kuch->kuc_msglen;
 	loff_t offset = 0;
-	mm_segment_t fs;
 	int rc = -ENXIO;
 
 	if (IS_ERR_OR_NULL(filp))
@@ -63,18 +62,14 @@ int libcfs_kkuc_msg_put(struct file *filp, void *payload)
 		return rc;
 	}
 
-	fs = get_fs();
-	set_fs(KERNEL_DS);
 	while (count > 0) {
-		rc = vfs_write(filp, (void __force __user *)payload,
-			       count, &offset);
+		rc = kernel_write(filp, payload, count, &offset);
 		if (rc < 0)
 			break;
 		count -= rc;
 		payload += rc;
 		rc = 0;
 	}
-	set_fs(fs);
 
 	if (rc < 0)
 		CWARN("message send failed (%d)\n", rc);