ocfs2: Use own splice write actor
We need to fill holes during a splice write. Provide our own splice write
actor which can call ocfs2_file_buffered_write() with a splice-specific
callback.
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 605c82a..014f4f5 100644
--- 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>
@@ -749,6 +750,74 @@
}
/*
+ * 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.
*/