1 files changed, 8 insertions, 7 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index d5fdae2eb183..4a2fee2cb62b 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -29,11 +29,6 @@
 #include <linux/security.h>
 #include <linux/syscalls.h>
 /*
- * This is needed for the following functions:
- *  - try_to_release_page
- *  - block_invalidatepage
- *  - generic_osync_inode
- *
  * FIXME: remove all knowledge of the buffer layer from the core VM
  */
 #include <linux/buffer_head.h> /* for generic_osync_inode */
@@ -1009,7 +1004,7 @@ __generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
                 if (pos < size) {
                         retval = generic_file_direct_IO(READ, iocb,
                                                 iov, pos, nr_segs);
-                        if (retval >= 0 && !is_sync_kiocb(iocb))
+                        if (retval > 0 && !is_sync_kiocb(iocb))
                                 retval = -EIOCBQUEUED;
                         if (retval > 0)
                                 *ppos = pos + retval;
@@ -1973,6 +1968,7 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
         do {
                 unsigned long index;
                 unsigned long offset;
+                unsigned long maxlen;
                 size_t copied;
 
                 offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
@@ -1987,7 +1983,10 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
                  * same page as we're writing to, without it being marked
                  * up-to-date.
                  */
-                fault_in_pages_readable(buf, bytes);
+                maxlen = cur_iov->iov_len - iov_base;
+                if (maxlen > bytes)
+                        maxlen = bytes;
+                fault_in_pages_readable(buf, maxlen);
 
                 page = __grab_cache_page(mapping,index,&cached_page,&lru_pvec);
                 if (!page) {
@@ -2029,6 +2028,8 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
                                         filemap_set_next_iovec(&cur_iov,
                                                         &iov_base, status);
                                         buf = cur_iov->iov_base + iov_base;
+                                } else {
+                                        iov_base += status;
                                 }
                         }
                 }