linux-kernel - [PATCH v3 8/8] ext4: Support for PUD-sized transparent huge pages

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Date:	Fri,  8 Jan 2016 14:49:52 -0500
From:	Matthew Wilcox <matthew.r.wilcox@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Matthew Wilcox <willy@...ux.intel.com>, linux-mm@...ck.org,
	linux-nvdimm@...ts.01.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [PATCH v3 8/8] ext4: Support for PUD-sized transparent huge pages

From: Matthew Wilcox <willy@...ux.intel.com>

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

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

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 665fc4b..cec5fa7 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;
 		}
-- 
2.6.4