btrfs: use GFP_KERNEL in init_ipath

Now that init_ipath is called either from a safe context or with
memalloc_nofs protection, we can switch to GFP_KERNEL allocations in
init_path and init_data_container.
Reviewed-by: NAnand Jain <anand.jain@oracle.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/backref.c

@@ -16,7 +16,7 @@
  * Boston, MA 021110-1307, USA.
  */
 
-#include <linux/vmalloc.h>
+#include <linux/mm.h>
 #include <linux/rbtree.h>
 #include "ctree.h"
 #include "disk-io.h"
@@ -2305,7 +2305,7 @@ struct btrfs_data_container *init_data_container(u32 total_bytes)
 	size_t alloc_bytes;
 
 	alloc_bytes = max_t(size_t, total_bytes, sizeof(*data));
-	data = vmalloc(alloc_bytes);
+	data = kvmalloc(alloc_bytes, GFP_KERNEL);
 	if (!data)
 		return ERR_PTR(-ENOMEM);
 
@@ -2339,9 +2339,9 @@ struct inode_fs_paths *init_ipath(s32 total_bytes, struct btrfs_root *fs_root,
 	if (IS_ERR(fspath))
 		return (void *)fspath;
 
-	ifp = kmalloc(sizeof(*ifp), GFP_NOFS);
+	ifp = kmalloc(sizeof(*ifp), GFP_KERNEL);
 	if (!ifp) {
-		vfree(fspath);
+		kvfree(fspath);
 		return ERR_PTR(-ENOMEM);
 	}
 
@@ -2356,6 +2356,6 @@ void free_ipath(struct inode_fs_paths *ipath)
 {
 	if (!ipath)
 		return;
-	vfree(ipath->fspath);
+	kvfree(ipath->fspath);
 	kfree(ipath);
 }

fs/btrfs/ioctl.c

@@ -37,7 +37,7 @@
 #include <linux/bit_spinlock.h>
 #include <linux/security.h>
 #include <linux/xattr.h>
-#include <linux/vmalloc.h>
+#include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
 #include <linux/uuid.h>
@@ -4588,7 +4588,7 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
 
 out:
 	btrfs_free_path(path);
-	vfree(inodes);
+	kvfree(inodes);
 	kfree(loi);
 
 	return ret;