Merge branch 'for-2.6.22' of git://git.kernel.dk/data/git/linux-2.6-block

* 'for-2.6.22' of git://git.kernel.dk/data/git/linux-2.6-block:
  [PATCH] ll_rw_blk: fix missing bounce in blk_rq_map_kern()
  [PATCH] splice: always call into page_cache_readahead()
  [PATCH] splice(): fix interaction with readahead

1 files changed, 8 insertions, 9 deletions

diff --git a/fs/splice.c b/fs/splice.c
index 5428b0ff3b6f..12f28281d2b1 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -289,12 +289,10 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
                 nr_pages = PIPE_BUFFERS;
 
         /*
-         * Initiate read-ahead on this page range. however, don't call into
-         * read-ahead if this is a non-zero offset (we are likely doing small
-         * chunk splice and the page is already there) for a single page.
+         * Don't try to 2nd guess the read-ahead logic, call into
+         * page_cache_readahead() like the page cache reads would do.
          */
-        if (!loff || nr_pages > 1)
-                page_cache_readahead(mapping, &in->f_ra, in, index, nr_pages);
+        page_cache_readahead(mapping, &in->f_ra, in, index, nr_pages);
 
         /*
          * Now fill in the holes:
@@ -378,10 +376,11 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
                          * If in nonblock mode then dont block on waiting
                          * for an in-flight io page
                          */
-                        if (flags & SPLICE_F_NONBLOCK)
-                                break;
-
-                        lock_page(page);
+                        if (flags & SPLICE_F_NONBLOCK) {
+                                if (TestSetPageLocked(page))
+                                        break;
+                        } else
+                                lock_page(page);
 
                         /*
                          * page was truncated, stop here. if this isn't the