[PATCH] splice: fix smaller sized splice reads

Signed-off-by: Jens Axboe <axboe@suse.de>

1 files changed, 12 insertions, 1 deletions

diff --git a/fs/splice.c b/fs/splice.c
index 22fac87e90b3..0559e7577a04 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -275,6 +275,15 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
         error = 0;
         bytes = 0;
         for (i = 0; i < nr_pages; i++, index++) {
+                unsigned int this_len;
+
+                if (!len)
+                        break;
+
+                /*
+                 * this_len is the max we'll use from this page
+                 */
+                this_len = min(len, PAGE_CACHE_SIZE - loff);
 find_page:
                 /*
                  * lookup the page for this index
@@ -366,11 +375,13 @@ readpage:
                                  * force quit after adding this page
                                  */
                                 nr_pages = i;
+                                this_len = min(this_len, loff);
                         }
                 }
 fill_it:
                 pages[i] = page;
-                bytes += PAGE_CACHE_SIZE - loff;
+                bytes += this_len;
+                len -= this_len;
                 loff = 0;
         }