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| author | Tao Ma <tao.ma@oracle.com> | 2010-07-14 11:19:32 +0800 |
|---|---|---|
| committer | Joel Becker <joel.becker@oracle.com> | 2010-07-15 10:54:28 -0700 |
| commit | f5e27b6ddfbafdd9c9c2f06bbf28af12581409bc (patch) | |
| tree | b55eb9842a3ee2cfebb6a24ab2ee4ffbd597daee /fs | |
| parent | e372357ba55ae89307af15cd680467d8f0db4f01 (diff) | |
| download | lwn-f5e27b6ddfbafdd9c9c2f06bbf28af12581409bc.tar.gz lwn-f5e27b6ddfbafdd9c9c2f06bbf28af12581409bc.zip | |
ocfs2: Don't duplicate pages past i_size during CoW.
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ocfs2/refcounttree.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c index 32949df10694..3ac5aa733e9c 100644 --- a/fs/ocfs2/refcounttree.c +++ b/fs/ocfs2/refcounttree.c @@ -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; |