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ocfs2: Add readhead during CoW. 

In CoW, when we meet with a readahead page, we know
it is time to move the readahead window. So carry
out a new readahead.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
This commit is contained in:
Tao Ma 2010-08-12 10:31:34 +08:00
parent 7b61cf54a2
commit 6ea4843f53
1 changed files with 14 additions and 1 deletions
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15
fs/ocfs2/refcounttree.c
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@ -49,6 +49,7 @@
struct ocfs2_cow_context {
struct inode *inode;
struct file *file;
u32 cow_start;
u32 cow_len;
struct ocfs2_extent_tree data_et;
@ -2922,13 +2923,16 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
struct page *page;
pgoff_t page_index;
unsigned int from, to;
unsigned int from, to, readahead_pages;
loff_t offset, end, map_end;
struct address_space *mapping = context->inode->i_mapping;
mlog(0, "old_cluster %u, new %u, len %u at offset %u\n", old_cluster,
new_cluster, new_len, cpos);
readahead_pages =
(ocfs2_cow_contig_clusters(sb) <<
OCFS2_SB(sb)->s_clustersize_bits) >> PAGE_CACHE_SHIFT;
offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
/*
@ -2959,6 +2963,14 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
if (PAGE_CACHE_SIZE <= OCFS2_SB(sb)->s_clustersize)
BUG_ON(PageDirty(page));
if (PageReadahead(page) && context->file) {
page_cache_async_readahead(mapping,
&context->file->f_ra,
context->file,
page, page_index,
readahead_pages);
}
if (!PageUptodate(page)) {
ret = block_read_full_page(page, ocfs2_get_block);
if (ret) {
@ -3478,6 +3490,7 @@ static int ocfs2_refcount_cow_hunk(struct inode *inode,
context->ref_root_bh = ref_root_bh;
context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page;
context->get_clusters = ocfs2_di_get_clusters;
context->file = file;
ocfs2_init_dinode_extent_tree(&context->data_et,
INODE_CACHE(inode), di_bh);