[PATCH v4 8/8] ext4: Support for PUD-sized transparent huge pages

[Matthew Wilcox]

From: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>

ext4 needs to reserve enough space in the journal to allocate a PUD-sized
page.

Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
---
 fs/ext4/file.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 71859ed..ec6664a 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -211,6 +211,10 @@ static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 			nblocks = ext4_chunk_trans_blocks(inode,
 						PMD_SIZE / PAGE_SIZE);
 			break;
+		case FAULT_FLAG_SIZE_PUD:
+			nblocks = ext4_chunk_trans_blocks(inode,
+						PUD_SIZE / PAGE_SIZE);
+			break;
 		default:
 			return VM_FAULT_FALLBACK;
 		}
-- 
2.7.0.rc3