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ocfs2: Don't duplicate pages past i_size during CoW.

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During CoW, the pages after i_size don't contain valid data, so there's
no need to read and duplicate them.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Tao Ma 2010-07-14 11:19:32 +08:00 committed by Joel Becker
parent e372357ba5
commit f5e27b6ddf
1 changed files with 6 additions and 0 deletions
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6
fs/ocfs2/refcounttree.c
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@ -2931,6 +2931,12 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
/*
* We only duplicate pages until we reach the page contains i_size - 1.
* So trim 'end' to i_size.
*/
if (end > i_size_read(context->inode))
end = i_size_read(context->inode);
while (offset < end) {
page_index = offset >> PAGE_CACHE_SHIFT;