Merge branches 'pxa-ian' and 'pxa-xm270' into pxa

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / splice.c

diff --git a/fs/splice.c b/fs/splice.c
index cece15b4ef72e4d82f08c76fa4a41ea9b3093318..aa5f6f60b3055f8a35b59084f0c652cb0e5c2125 100644 (file)
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -58,8 +58,8 @@ static int page_cache_pipe_buf_steal(struct pipe_inode_info *pipe,
                 */
                wait_on_page_writeback(page);
 
-               if (PagePrivate(page))
-                       try_to_release_page(page, GFP_KERNEL);
+               if (PagePrivate(page) && !try_to_release_page(page, GFP_KERNEL))
+                       goto out_unlock;
 
                /*
                 * If we succeeded in removing the mapping, set LRU flag
@@ -75,6 +75,7 @@ static int page_cache_pipe_buf_steal(struct pipe_inode_info *pipe,
         * Raced with truncate or failed to remove page from current
         * address space, unlock and return failure.
         */
+out_unlock:
        unlock_page(page);
        return 1;
 }
@@ -983,7 +984,7 @@ ssize_t splice_direct_to_actor(struct file *in, struct splice_desc *sd,
 
        while (len) {
                size_t read_len;
-               loff_t pos = sd->pos;
+               loff_t pos = sd->pos, prev_pos = pos;
 
                ret = do_splice_to(in, &pos, pipe, len, flags);
                if (unlikely(ret <= 0))
@@ -998,15 +999,19 @@ ssize_t splice_direct_to_actor(struct file *in, struct splice_desc *sd,
                 * could get stuck data in the internal pipe:
                 */
                ret = actor(pipe, sd);
-               if (unlikely(ret <= 0))
+               if (unlikely(ret <= 0)) {
+                       sd->pos = prev_pos;
                        goto out_release;
+               }
 
                bytes += ret;
                len -= ret;
                sd->pos = pos;
 
-               if (ret < read_len)
+               if (ret < read_len) {
+                       sd->pos = prev_pos + ret;
                        goto out_release;
+               }
        }
 
 done: