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

Message ID 1454242175-16870-9-git-send-email-matthew.r.wilcox@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Wilcox, Matthew R Jan. 31, 2016, 12:09 p.m. UTC 
From: Matthew Wilcox <willy@linux.intel.com>

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

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

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;
 		}