Patchwork [RFC,10/30] ext4: snapshot file - read through to block device

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Submitter Amir G.
Date May 9, 2011, 4:41 p.m.
Message ID <1304959308-11122-11-git-send-email-amir73il@users.sourceforge.net>
Download mbox | patch
Permalink /patch/94802/
State Deferred
Delegated to: Theodore Ts'o
Headers show

Comments

Amir G. - May 9, 2011, 4:41 p.m.
From: Amir Goldstein <amir73il@users.sf.net>

On active snapshot page read, the function ext4_snapshot_get_block()
is called to map the page to a disk block.  If the page is not mapped
in the snapshot file a direct mapping to the block device is returned.

Signed-off-by: Amir Goldstein <amir73il@users.sf.net>
Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
---
 fs/ext4/inode.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

Patch

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 4ec5f02..3acdbe5 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4181,8 +4181,7 @@  static int ext4_no_writepage(struct page *page,
  * the snapshot COW bitmaps and a few initial blocks copied on snapshot_take().
  */
 static const struct address_space_operations ext4_snapfile_aops = {
-	.readpage		= ext4_readpage,
-	.readpages		= ext4_readpages,
+	.readpage		= ext4_snapshot_readpage,
 	.writepage		= ext4_no_writepage,
 	.bmap			= ext4_bmap,
 	.invalidatepage		= ext4_invalidatepage,