lustre: get rid of playing with ->fs

* removed several pieces of dead code in lustre_compat25.h
* don't open-code current_umask() (and BTW, 0755 & (S_IRWXUGO | S_ISVTX)
is better spelled as 0755)
* fix broken attempt to get the pathname by dentry - abusing d_path() for
that is simply wrong.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/staging/lustre/lustre/include/linux/lustre_compat25.h

@@ -42,28 +42,6 @@
 
 #include "lustre_patchless_compat.h"
 
-# define LOCK_FS_STRUCT(fs)	spin_lock(&(fs)->lock)
-# define UNLOCK_FS_STRUCT(fs)	spin_unlock(&(fs)->lock)
-
-static inline void ll_set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
-				 struct dentry *dentry)
-{
-	struct path path;
-	struct path old_pwd;
-
-	path.mnt = mnt;
-	path.dentry = dentry;
-	LOCK_FS_STRUCT(fs);
-	old_pwd = fs->pwd;
-	path_get(&path);
-	fs->pwd = path;
-	UNLOCK_FS_STRUCT(fs);
-
-	if (old_pwd.dentry)
-		path_put(&old_pwd);
-}
-
-
 /*
  * set ATTR_BLOCKS to a high value to avoid any risk of collision with other
  * ATTR_* attributes (see bug 13828)
@@ -110,8 +88,6 @@ static inline void ll_set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
 #define cfs_bio_io_error(a, b)   bio_io_error((a))
 #define cfs_bio_endio(a, b, c)    bio_endio((a), (c))
 
-#define cfs_fs_pwd(fs)       ((fs)->pwd.dentry)
-#define cfs_fs_mnt(fs)       ((fs)->pwd.mnt)
 #define cfs_path_put(nd)     path_put(&(nd)->path)
 
 

drivers/staging/lustre/lustre/llite/dir.c

@@ -661,7 +661,7 @@ int ll_dir_setdirstripe(struct inode *dir, struct lmv_user_md *lump,
 	int mode;
 	int err;
 
-	mode = (0755 & (S_IRWXUGO|S_ISVTX) & ~current->fs->umask) | S_IFDIR;
+	mode = (0755 & ~current_umask()) | S_IFDIR;
 	op_data = ll_prep_md_op_data(NULL, dir, NULL, filename,
 				     strlen(filename), mode, LUSTRE_OPC_MKDIR,
 				     lump);

drivers/staging/lustre/lustre/llite/llite_lib.c

@@ -2372,21 +2372,6 @@ char *ll_get_fsname(struct super_block *sb, char *buf, int buflen)
 	return buf;
 }
 
-static char *ll_d_path(struct dentry *dentry, char *buf, int bufsize)
-{
-	char *path = NULL;
-
-	struct path p;
-
-	p.dentry = dentry;
-	p.mnt = current->fs->root.mnt;
-	path_get(&p);
-	path = d_path(&p, buf, bufsize);
-	path_put(&p);
-
-	return path;
-}
-
 void ll_dirty_page_discard_warn(struct page *page, int ioret)
 {
 	char *buf, *path = NULL;
@@ -2398,7 +2383,7 @@ void ll_dirty_page_discard_warn(struct page *page, int ioret)
 	if (buf != NULL) {
 		dentry = d_find_alias(page->mapping->host);
 		if (dentry != NULL)
-			path = ll_d_path(dentry, buf, PAGE_SIZE);
+			path = dentry_path_raw(dentry, buf, PAGE_SIZE);
 	}
 
 	CDEBUG(D_WARNING,