libglusterfs: Fix a read hang

Backport of http://review.gluster.org/#/c/15923/

Issue:
=====
In certain cases, there was no unwind of read
from read-ahead xlator, thus resulting in hang.

RCA:
====
In certain cases, ioc_readv() issues STACK_WIND_TAIL() instead
of STACK_WIND(). One such case is when inode_ctx for that file
is not present (can happen if readdirp was called, and populates
md-cache and serves all the lookups from cache).

Consider the following graph:
...
io-cache (parent)
   |
readdir-ahead
   |
read-ahead
...

Below is the code snippet of ioc_readv calling STACK_WIND_TAIL:
ioc_readv()
{
...
 if (!inode_ctx)
   STACK_WIND_TAIL (frame, FIRST_CHILD (frame->this),
                    FIRST_CHILD (frame->this)->fops->readv, fd,
                    size, offset, flags, xdata);
   /* Ideally, this stack_wind should wind to readdir-ahead:readv()
      but it winds to read-ahead:readv(). See below for
      explaination.
    */
...
}

STACK_WIND_TAIL (frame, obj, fn, ...)
{
  frame->this = obj;
  /* for the above mentioned graph, frame->this will be readdir-ahead
   * frame->this = FIRST_CHILD (frame->this) i.e. readdir-ahead, which
   * is as expected
   */
  ...
  THIS = obj;
  /* THIS will be read-ahead instead of readdir-ahead!, as obj expands
   * to "FIRST_CHILD (frame->this)" and frame->this was pointing
   * to readdir-ahead in the previous statement.
   */
  ...
  fn (frame, obj, params);
  /* fn will call read-ahead:readv() instead of readdir-ahead:readv()!
   * as fn expands to "FIRST_CHILD (frame->this)->fops->readv" and
   * frame->this was pointing ro readdir-ahead in the first statement
   */
  ...
}

Thus, the readdir-ahead's readv() implementation will be skipped, and
ra_readv() will be called with frame->this = "readdir-ahead" and
this = "read-ahead". This can lead to corruption / hang / other problems.
But in this perticular case, when 'frame->this' and 'this' passed
to ra_readv() doesn't match, it causes ra_readv() to call ra_readv()
again!. Thus the logic of read-ahead readv() falls apart and leads to
hang.

Solution:
=========
Modify STACK_WIND_TAIL() as:
STACK_WIND_TAIL (frame, obj, fn, ...)
{
  next_xl = obj /* resolve obj as the variables passed in obj macro
                   can be overwritten in the further instrucions */
  next_xl_fn = fn /* resolve fn and store in a tmp variable, before
                     modifying any variables */
  frame->this = next_xl;
  ...
  THIS = next_xl;
  ...
  next_xl_fn (frame, next_xl, params);
  ...
}

>Reviewed-on: http://review.gluster.org/15923
>Smoke: Gluster Build System <jenkins@build.gluster.org>
>NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
>Reviewed-by: Rajesh Joseph <rjoseph@redhat.com>
>CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
>Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
(Cherry picked from commit 8943c19a2ef51b6e4fa66cb57211d469fe558579)

BUG: 1399024
Change-Id: Ie662ac8f18fa16909376f1e59387bc5b886bd0f9
Signed-off-by: Poornima G <pgurusid@redhat.com>
Reviewed-on: http://review.gluster.org/15935
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/libglusterfs/src/stack.h b/libglusterfs/src/stack.h
index cbf7e9adb95..de2179d0051 100644
--- a/libglusterfs/src/stack.h
+++ b/libglusterfs/src/stack.h
@@ -279,17 +279,19 @@ STACK_RESET (call_stack_t *stack)
 #define STACK_WIND_TAIL(frame, obj, fn, params ...)                     \
         do {                                                            \
                 xlator_t     *old_THIS = NULL;                          \
+                xlator_t     *next_xl = obj;                            \
+                typeof(fn)    next_xl_fn = fn;                          \
                                                                         \
-                frame->this = obj;                                      \
+                frame->this = next_xl;                                  \
                 frame->wind_to = #fn;                                   \
                 old_THIS = THIS;                                        \
-                THIS = obj;                                             \
+                THIS = next_xl;                                         \
                 gf_msg_trace ("stack-trace", 0,                         \
                               "stack-address: %p, "                     \
                               "winding from %s to %s",                  \
                               frame->root, old_THIS->name,              \
                               THIS->name);                              \
-                fn (frame, obj, params);                                \
+                next_xl_fn (frame, next_xl, params);                    \
                 THIS = old_THIS;                                        \
         } while (0)