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[20/29] ocfs2: fix pagecache truncation prior to reflink

Message ID 153981639941.5568.14471990950819406360.stgit@magnolia
State New, archived
Headers show
Series fs: fixes for serious clone/dedupe problems | expand

Commit Message

Darrick J. Wong Oct. 17, 2018, 10:46 p.m. UTC
From: Darrick J. Wong <darrick.wong@oracle.com>

Prior to remapping blocks, it is necessary to remove pages from the
destination file's page cache.  Unfortunately, the truncation is not
aggressive enough -- if page size > block size, we'll end up zeroing
subpage blocks instead of removing them.  So, round the start offset
down and the end offset up to page boundaries.  We already wrote all
the dirty data so the larger range should be fine.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
 fs/ocfs2/refcounttree.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 2a5c96bc9677..7c709229e108 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -4862,8 +4862,9 @@  int ocfs2_reflink_remap_range(struct file *file_in,
 	/* Zap any page cache for the destination file's range. */
-	truncate_inode_pages_range(&inode_out->i_data, pos_out,
-				   PAGE_ALIGN(pos_out + len) - 1);
+	truncate_inode_pages_range(&inode_out->i_data,
+				   round_down(pos_out, PAGE_SIZE),
+				   round_up(pos_out + len, PAGE_SIZE) - 1);
 	ret = ocfs2_reflink_remap_blocks(inode_in, in_bh, pos_in, inode_out,
 					 out_bh, pos_out, len);