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| author | Tao Ma <tao.ma@oracle.com> | 2010-08-12 04:31:34 +0200 |
|---|---|---|
| committer | Tao Ma <tao.ma@oracle.com> | 2010-08-12 04:40:05 +0200 |
| commit | 6ea4843f53282465f2bdbe5eedde7d8c3081dfdf (patch) | |
| tree | 60786d137b206cabb5731e3b2903cb5d9d902ab9 | |
| parent | ocfs2: Add readahead support for CoW. (diff) | |
| download | linux-6ea4843f53282465f2bdbe5eedde7d8c3081dfdf.tar.xz linux-6ea4843f53282465f2bdbe5eedde7d8c3081dfdf.zip | |
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>
| -rw-r--r-- | fs/ocfs2/refcounttree.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c index ad08c1134baa..47549f64224c 100644 --- a/fs/ocfs2/refcounttree.c +++ b/fs/ocfs2/refcounttree.c @@ -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); |