Bugfix: open_file_cache lost is_directio flag.

On file retest open_file_cache lost is_directio if file wasn't changed.
This caused unaligned operations under Linux to fail with EINVAL.
It wasn't noticeable with AIO though, as errors wasn't properly logged.

src/core/ngx_open_file_cache.c

diff --git a/src/core/ngx_open_file_cache.c b/src/core/ngx_open_file_cache.c
index a70385c..1cce9e9 100644
--- a/src/core/ngx_open_file_cache.c
+++ b/src/core/ngx_open_file_cache.c
@@ -290,6 +290,8 @@
                     file->use_event = 1;
                 }
 
+                of->is_directio = file->is_directio;
+
                 goto renew;
             }
 

src/os/unix/ngx_file_aio_read.c

diff --git a/src/os/unix/ngx_file_aio_read.c b/src/os/unix/ngx_file_aio_read.c
index ef7a461..557f9de 100644
--- a/src/os/unix/ngx_file_aio_read.c
+++ b/src/os/unix/ngx_file_aio_read.c
@@ -86,6 +86,9 @@
             return aio->nbytes;
         }
 
+        ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
+                      "aio read \"%s\" failed", file->name.data);
+
         return NGX_ERROR;
     }
 

src/os/unix/ngx_linux_aio_read.c

diff --git a/src/os/unix/ngx_linux_aio_read.c b/src/os/unix/ngx_linux_aio_read.c
index 72875ca..b9d1d01 100644
--- a/src/os/unix/ngx_linux_aio_read.c
+++ b/src/os/unix/ngx_linux_aio_read.c
@@ -74,6 +74,10 @@
         }
 
         ngx_set_errno(-aio->res);
+
+        ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
+                      "aio read \"%s\" failed", file->name.data);
+
         return NGX_ERROR;
     }