glusterfs/SOURCES/0476-mount-fuse-use-cookies-to-get-fuse-interrupt-record-.patch

From 40519185067d891f06818c574301ea1af4b36479 Mon Sep 17 00:00:00 2001
From: Pranith Kumar K <pkarampu@redhat.com>
Date: Wed, 17 Jun 2020 10:45:19 +0530
Subject: [PATCH 476/478] mount/fuse: use cookies to get fuse-interrupt-record
 instead of xdata

Problem:
On executing tests/features/flock_interrupt.t the following error log
appears
[2020-06-16 11:51:54.631072 +0000] E
[fuse-bridge.c:4791:fuse_setlk_interrupt_handler_cbk] 0-glusterfs-fuse:
interrupt record not found

This happens because fuse-interrupt-record is never sent on the wire by
getxattr fop and there is no guarantee that in the cbk it will be
available in case of failures.

Fix:
wind getxattr fop with fuse-interrupt-record as cookie and recover it
in the cbk

Upstream:
> Reviewed-on: https://review.gluster.org/24588
> Fixes: #1310
> Change-Id: I4cfff154321a449114fc26e9440db0f08e5c7daa
> Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>

BUG: 1821743
Change-Id: If9576801654d4d743bd66ae90ca259c4d34746a7
Signed-off-by: Csaba Henk <csaba@redhat.com>
Reviewed-on: https://code.engineering.redhat.com/gerrit/216159
Tested-by: RHGS Build Bot <nigelb@redhat.com>
Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
---
 tests/features/flock_interrupt.t     |  1 -
 xlators/mount/fuse/src/fuse-bridge.c | 28 +++++++---------------------
 2 files changed, 7 insertions(+), 22 deletions(-)

diff --git a/tests/features/flock_interrupt.t b/tests/features/flock_interrupt.t
index 964a4bc..b8717e3 100644
--- a/tests/features/flock_interrupt.t
+++ b/tests/features/flock_interrupt.t
@@ -28,6 +28,5 @@ flock $M0/testfile sleep 6 & { sleep 0.3; flock -w 2 $M0/testfile true; echo ok
 EXPECT_WITHIN 4 ok cat got_lock;
 
 ## Finish up
-sleep 7;
 rm -f got_lock;
 cleanup;
diff --git a/xlators/mount/fuse/src/fuse-bridge.c b/xlators/mount/fuse/src/fuse-bridge.c
index f61fa39..1bddac2 100644
--- a/xlators/mount/fuse/src/fuse-bridge.c
+++ b/xlators/mount/fuse/src/fuse-bridge.c
@@ -4768,16 +4768,8 @@ fuse_setlk_interrupt_handler_cbk(call_frame_t *frame, void *cookie,
                                  int32_t op_errno, dict_t *dict, dict_t *xdata)
 {
     fuse_interrupt_state_t intstat = INTERRUPT_NONE;
-    fuse_interrupt_record_t *fir;
+    fuse_interrupt_record_t *fir = cookie;
     fuse_state_t *state = NULL;
-    int ret = 0;
-
-    ret = dict_get_bin(xdata, "fuse-interrupt-record", (void **)&fir);
-    if (ret < 0) {
-        gf_log("glusterfs-fuse", GF_LOG_ERROR, "interrupt record not found");
-
-        goto out;
-    }
 
     intstat = op_ret >= 0 ? INTERRUPT_HANDLED : INTERRUPT_SQUELCHED;
 
@@ -4789,7 +4781,6 @@ fuse_setlk_interrupt_handler_cbk(call_frame_t *frame, void *cookie,
         GF_FREE(state);
     }
 
-out:
     STACK_DESTROY(frame->root);
 
     return 0;
@@ -4827,9 +4818,10 @@ fuse_setlk_interrupt_handler(xlator_t *this, fuse_interrupt_record_t *fir)
     frame->op = GF_FOP_GETXATTR;
     state->name = xattr_name;
 
-    STACK_WIND(frame, fuse_setlk_interrupt_handler_cbk, state->active_subvol,
-               state->active_subvol->fops->fgetxattr, state->fd, xattr_name,
-               state->xdata);
+    STACK_WIND_COOKIE(frame, fuse_setlk_interrupt_handler_cbk, fir,
+                      state->active_subvol,
+                      state->active_subvol->fops->fgetxattr, state->fd,
+                      xattr_name, state->xdata);
 
     return;
 
@@ -4852,15 +4844,9 @@ fuse_setlk_resume(fuse_state_t *state)
     fir = fuse_interrupt_record_new(state->finh, fuse_setlk_interrupt_handler);
     state_clone = gf_memdup(state, sizeof(*state));
     if (state_clone) {
-        /*
-         * Calling this allocator with fir casted to (char *) seems like
-         * an abuse of this API, but in fact the API is stupid to assume
-         * a (char *) argument (in the funcion it's casted to (void *)
-         * anyway).
-         */
-        state_clone->xdata = dict_for_key_value(
-            "fuse-interrupt-record", (char *)fir, sizeof(*fir), _gf_true);
+        state_clone->xdata = dict_new();
     }
+
     if (!fir || !state_clone || !state_clone->xdata) {
         if (fir) {
             GF_FREE(fir);
-- 
1.8.3.1