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ocfs2: fix pagecache truncation prior to reflink 

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>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2018-10-30 10:43:16 +11:00 committed by Dave Chinner
parent 2587b1f1fa
commit a8a94302c9
1 changed files with 3 additions and 2 deletions
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5
fs/ocfs2/refcounttree.c
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@ -4862,8 +4862,9 @@ int ocfs2_reflink_remap_range(struct file *file_in,
SINGLE_DEPTH_NESTING);
/* 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);