ocfs2: Use own splice write actor

[powerpc.git] / fs / ocfs2 / aops.c

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 605c82a..014f4f5 100644 (file)
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -25,6 +25,7 @@
 #include <linux/pagemap.h>
 #include <asm/byteorder.h>
 #include <linux/swap.h>
+#include <linux/pipe_fs_i.h>
 
 #define MLOG_MASK_PREFIX ML_FILE_IO
 #include <cluster/masklog.h>
@@ -748,6 +749,74 @@ next_bh:
        return ret;
 }
 
+/*
+ * This will copy user data from the buffer page in the splice
+ * context.
+ *
+ * For now, we ignore SPLICE_F_MOVE as that would require some extra
+ * communication out all the way to ocfs2_write().
+ */
+int ocfs2_map_and_write_splice_data(struct inode *inode,
+                                 struct ocfs2_write_ctxt *wc, u64 *p_blkno,
+                                 unsigned int *ret_from, unsigned int *ret_to)
+{
+       int ret;
+       unsigned int to, from, cluster_start, cluster_end;
+       char *src, *dst;
+       struct ocfs2_splice_write_priv *sp = wc->w_private;
+       struct pipe_buffer *buf = sp->s_buf;
+       unsigned long bytes, src_from;
+       struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+       ocfs2_figure_cluster_boundaries(osb, wc->w_cpos, &cluster_start,
+                                       &cluster_end);
+
+       from = sp->s_offset;
+       src_from = sp->s_buf_offset;
+       bytes = wc->w_count;
+
+       if (wc->w_large_pages) {
+               /*
+                * For cluster size < page size, we have to
+                * calculate pos within the cluster and obey
+                * the rightmost boundary.
+                */
+               bytes = min(bytes, (unsigned long)(osb->s_clustersize
+                                  - (wc->w_pos & (osb->s_clustersize - 1))));
+       }
+       to = from + bytes;
+
+       if (wc->w_this_page_new)
+               ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode,
+                                           cluster_start, cluster_end, 1);
+       else
+               ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode,
+                                           from, to, 0);
+       if (ret) {
+               mlog_errno(ret);
+               goto out;
+       }
+
+       BUG_ON(from > PAGE_CACHE_SIZE);
+       BUG_ON(to > PAGE_CACHE_SIZE);
+       BUG_ON(from > osb->s_clustersize);
+       BUG_ON(to > osb->s_clustersize);
+
+       src = buf->ops->map(sp->s_pipe, buf, 1);
+       dst = kmap_atomic(wc->w_this_page, KM_USER1);
+       memcpy(dst + from, src + src_from, bytes);
+       kunmap_atomic(wc->w_this_page, KM_USER1);
+       buf->ops->unmap(sp->s_pipe, buf, src);
+
+       wc->w_finished_copy = 1;
+
+       *ret_from = from;
+       *ret_to = to;
+out:
+
+       return bytes ? (unsigned int)bytes : ret;
+}
+
 /*
  * This will copy user data from the iovec in the buffered write
  * context.