Advertise support of FUSE_PARALLEL_DIROPS to kernel

Resolves: RHEL-19149

Signed-off-by: Pavel Reichl <preichl@redhat.com>

fuse-3.17.0-Don-t-set-FUSE_CAP_PARALLEL_DIROPS-by-default.patch

@@ -0,0 +1,42 @@
+From 2c736f516f28dfb5c58aff345c668a5ea6386295 Mon Sep 17 00:00:00 2001
+From: Miklos Szeredi <mszeredi@redhat.com>
+Date: Wed, 10 Jan 2024 10:15:43 +0100
+Subject: [PATCH] Don't set FUSE_CAP_PARALLEL_DIROPS by default
+
+Allowing parallel dir operations could result in a crash in a filesystem
+implementation that is not prepared for this.
+
+To be safe keep this flag off by default (this is not a regression, since
+there was no public release where this flag wasn't ignored).
+
+If the filesystem wants better performance, then it should set this flag
+explicitly.
+
+Fixes: c9905341ea34 ("Pass FUSE_PARALLEL_DIROPS to kernel (#861)")
+Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
+---
+ include/fuse_common.h |    2 --
+ lib/fuse_lowlevel.c   |    1 -
+ 2 files changed, 3 deletions(-)
+
+--- a/include/fuse_common.h
++++ b/include/fuse_common.h
+@@ -313,8 +313,6 @@ struct fuse_loop_config {
+  * is unset, the FUSE kernel module will ensure that lookup() and
+  * readdir() requests are never issued concurrently for the same
+  * directory.
+- *
+- * This feature is enabled by default when supported by the kernel.
+  */
+ #define FUSE_CAP_PARALLEL_DIROPS        (1 << 18)
+ 
+--- a/lib/fuse_lowlevel.c
++++ b/lib/fuse_lowlevel.c
+@@ -2009,7 +2009,6 @@ void do_init(fuse_req_t req, fuse_ino_t
+ 	if ((cond) && (se->conn.capable & (cap))) \
+ 		se->conn.want |= (cap)
+ 	LL_SET_DEFAULT(1, FUSE_CAP_ASYNC_READ);
+-	LL_SET_DEFAULT(1, FUSE_CAP_PARALLEL_DIROPS);
+ 	LL_SET_DEFAULT(1, FUSE_CAP_AUTO_INVAL_DATA);
+ 	LL_SET_DEFAULT(1, FUSE_CAP_HANDLE_KILLPRIV);
+ 	LL_SET_DEFAULT(1, FUSE_CAP_ASYNC_DIO);

fuse-3.17.0-Pass-FUSE_PARALLEL_DIROPS-to-kernel-861.patch

@@ -0,0 +1,23 @@
+From c9905341ea34ff9acbc11b3c53ba8bcea35eeed8 Mon Sep 17 00:00:00 2001
+From: fdinoff <fdinoff@google.com>
+Date: Thu, 16 Nov 2023 06:23:20 -0500
+Subject: [PATCH] Pass FUSE_PARALLEL_DIROPS to kernel (#861)
+
+This tells the kernel that parallel lookup/readdir operations are
+supported. This is enabled by default but was not passed to the kernel
+so you always get the synchronized version.
+---
+ lib/fuse_lowlevel.c |    2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/lib/fuse_lowlevel.c
++++ b/lib/fuse_lowlevel.c
+@@ -2093,6 +2093,8 @@ void do_init(fuse_req_t req, fuse_ino_t
+ 		outargflags |= FUSE_ASYNC_DIO;
+ 	if (se->conn.want & FUSE_CAP_WRITEBACK_CACHE)
+ 		outargflags |= FUSE_WRITEBACK_CACHE;
++	if (se->conn.want & FUSE_CAP_PARALLEL_DIROPS)
++		outargflags |= FUSE_PARALLEL_DIROPS;
+ 	if (se->conn.want & FUSE_CAP_POSIX_ACL)
+ 		outargflags |= FUSE_POSIX_ACL;
+ 	if (se->conn.want & FUSE_CAP_CACHE_SYMLINKS)

fuse.spec

@@ -4,7 +4,7 @@
 
 Name:		fuse
 Version:	%{fuse2ver}
-Release:	17%{?dist}
+Release:	18%{?dist}
 Summary:	File System in Userspace (FUSE) v2 utilities
 License:	GPL+
 URL:		http://fuse.sf.net
@@ -30,6 +30,8 @@ Patch12:	0005-BZ_217095_Modify-structures-in-libfuse-to-handle-flags-beyond-rhel
 Patch13:	0006-BZ_2171095.patch
 Patch14:	0007-BZ_2171095-cap.patch
 Patch15:	0008-BZ_217095-libfuse-add-feature-flag-for-expire-only.patch
+Patch16:	fuse-3.17.0-Pass-FUSE_PARALLEL_DIROPS-to-kernel-861.patch
+Patch17:	fuse-3.17.0-Don-t-set-FUSE_CAP_PARALLEL_DIROPS-by-default.patch
 
 Requires:	which
 Conflicts:	filesystem < 3
@@ -128,6 +130,8 @@ pushd lib%{name}-%{name}-%{fuse3ver}
 %patch13 -p1
 %patch14 -p1
 %patch15 -p1
+%patch16 -p1
+%patch17 -p1
 
 popd
 
@@ -259,6 +263,10 @@ rm -f %{buildroot}/usr/lib/udev/rules.d/99-fuse3.rules
 %{_includedir}/fuse3/
 
 %changelog
+* Fri Feb 02 2024 Pavel Reichl <preichl@redhat.com> - 2.9.7-18
+- Advertise support of FUSE_PARALLEL_DIROPS to kernel
+- Fixes RHEL-19149
+
 * Thu Mar 23 2023 Pavel Reichl <preichl@redhat.com> - 2.9.7-17
 - Add feature_notify_inode_expire_only
 - Fixes rhbz#2171095