staging/lustre/libcfs: remove filp_write

Use vfs_write instead and call kmap/kunmap to ensure
that we can access high memory zone.

Cc: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Peng Tao <bergwolf@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/include/linux/libcfs/linux/linux-fs.h

@@ -52,9 +52,6 @@
 #include <linux/backing-dev.h>
 #include <linux/posix_acl_xattr.h>
 
-#define filp_write(fp, buf, size, pos)			\
-	((fp)->f_op->write((fp), (buf), (size), pos))
-
 #define flock_type(fl)			((fl)->fl_type)
 #define flock_set_type(fl, type)	do { (fl)->fl_type = (type); } while (0)
 #define flock_pid(fl)			((fl)->fl_pid)

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

@@ -678,6 +678,7 @@ int cfs_tracefile_dump_all_pages(char *filename)
 	struct file		*filp;
 	struct cfs_trace_page	*tage;
 	struct cfs_trace_page	*tmp;
+	char			*buf;
 	int rc;
 
 	DECL_MMSPACE;
@@ -708,8 +709,11 @@ int cfs_tracefile_dump_all_pages(char *filename)
 
 		__LASSERT_TAGE_INVARIANT(tage);
 
-		rc = filp_write(filp, page_address(tage->page),
-				tage->used, &filp->f_pos);
+		buf = kmap(tage->page);
+		rc = vfs_write(filp, (__force const char __user *)buf,
+			       tage->used, &filp->f_pos);
+		kunmap(tage->page);
+
 		if (rc != (int)tage->used) {
 			printk(KERN_WARNING "wanted to write %u but wrote "
 			       "%d\n", tage->used, rc);
@@ -971,6 +975,7 @@ static int tracefiled(void *arg)
 	struct cfs_trace_page *tage;
 	struct cfs_trace_page *tmp;
 	struct file *filp;
+	char *buf;
 	int last_loop = 0;
 	int rc;
 
@@ -1023,8 +1028,11 @@ static int tracefiled(void *arg)
 			else if (f_pos > i_size_read(filp->f_dentry->d_inode))
 				f_pos = i_size_read(filp->f_dentry->d_inode);
 
-			rc = filp_write(filp, page_address(tage->page),
-					tage->used, &f_pos);
+			buf = kmap(tage->page);
+			rc = vfs_write(filp, (__force const char __user *)buf,
+				       tage->used, &f_pos);
+			kunmap(tage->page);
+
 			if (rc != (int)tage->used) {
 				printk(KERN_WARNING "wanted to write %u "
 				       "but wrote %d\n", tage->used, rc);