Semi-automated update for zfs 0.7.9

.SRCINFO

@@ -1,7 +1,7 @@
 pkgbase = zfs-dkms
 	pkgdesc = Kernel modules for the Zettabyte File System.
 	pkgver = 0.7.9
-	pkgrel = 1
+	pkgrel = 2
 	url = http://zfsonlinux.org/
 	arch = x86_64
 	groups = archzfs-dkms
@@ -36,7 +36,9 @@ pkgbase = zfs-dkms
 	conflicts = zfs-linux-zen-headers
 	conflicts = zfs-linux-zen-git-headers
 	source = https://github.com/zfsonlinux/zfs/releases/download/zfs-0.7.9/zfs-0.7.9.tar.gz
+	source = upstream-ac09630-Fix-zpl_mount-deadlock.patch
 	sha256sums = f50ca2441c6abde4fe6b9f54d5583a45813031d6bb72b0011b00fc2683cd9f7a
+	sha256sums = 1799f6f7b2a60a23b66106c9470414628398f6bfc10da3d0f41c548bba6130e8
 
 pkgname = zfs-dkms
 

PKGBUILD

@@ -1,25 +1,29 @@
-# Maintainer: Jesus Alvarez <jeezusjr at gmail dot com>
+# Maintainer: Jan Houben <jan@nexttrex.de>
+# Contributor: Jesus Alvarez <jeezusjr at gmail dot com>
 #
 # This PKGBUILD was generated by the archzfs build scripts located at
 #
 # http://github.com/archzfs/archzfs
 #
-#
 pkgname="zfs-dkms"
 pkgdesc="Kernel modules for the Zettabyte File System."
 
 pkgver=0.7.9
-pkgrel=1
+pkgrel=2
 makedepends=()
 arch=("x86_64")
 url="http://zfsonlinux.org/"
-source=("https://github.com/zfsonlinux/zfs/releases/download/zfs-0.7.9/zfs-0.7.9.tar.gz")
-sha256sums=("f50ca2441c6abde4fe6b9f54d5583a45813031d6bb72b0011b00fc2683cd9f7a")
+source=("https://github.com/zfsonlinux/zfs/releases/download/zfs-0.7.9/zfs-0.7.9.tar.gz" "upstream-ac09630-Fix-zpl_mount-deadlock.patch")
+sha256sums=("f50ca2441c6abde4fe6b9f54d5583a45813031d6bb72b0011b00fc2683cd9f7a" "1799f6f7b2a60a23b66106c9470414628398f6bfc10da3d0f41c548bba6130e8")
 license=("CDDL")
 depends=('spl-dkms' "zfs-utils-common=0.7.9" "lsb-release")
 provides=("zfs")
 groups=("archzfs-dkms")
 conflicts=('zfs-dkms-git' 'zfs-archiso-linux' 'zfs-archiso-linux-git' 'zfs-linux-hardened' 'zfs-linux-hardened-git' 'zfs-linux-lts' 'zfs-linux-lts-git' 'zfs-linux' 'zfs-linux-git' 'zfs-linux-vfio' 'zfs-linux-vfio-git' 'zfs-linux-zen' 'zfs-linux-zen-git'  'zfs-archiso-linux-headers' 'zfs-archiso-linux-git-headers' 'zfs-linux-hardened-headers' 'zfs-linux-hardened-git-headers' 'zfs-linux-lts-headers' 'zfs-linux-lts-git-headers' 'zfs-linux-headers' 'zfs-linux-git-headers' 'zfs-linux-vfio-headers' 'zfs-linux-vfio-git-headers' 'zfs-linux-zen-headers' 'zfs-linux-zen-git-headers' )
+prepare() {
+    cd "${srcdir}/zfs-0.7.9"
+    patch -Np1 -i ${srcdir}/upstream-ac09630-Fix-zpl_mount-deadlock.patch
+}
 
 build() {
     cd "${srcdir}/zfs-0.7.9"

upstream-ac09630-Fix-zpl_mount-deadlock.patch

@@ -0,0 +1,89 @@
+From ac09630d8b0bf6c92084a30fdaefd03fd0adbdc1 Mon Sep 17 00:00:00 2001
+From: Brian Behlendorf <behlendorf1@llnl.gov>
+Date: Wed, 11 Jul 2018 15:49:10 -0700
+Subject: [PATCH] Fix zpl_mount() deadlock
+
+Commit 93b43af10 inadvertently introduced the following scenario which
+can result in a deadlock.  This issue was most easily reproduced by
+LXD containers using a ZFS storage backend but should be reproducible
+under any workload which is frequently mounting and unmounting.
+
+-- THREAD A --
+spa_sync()
+  spa_sync_upgrades()
+    rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); <- Waiting on B
+
+-- THREAD B --
+mount_fs()
+  zpl_mount()
+    zpl_mount_impl()
+      dmu_objset_hold()
+        dmu_objset_hold_flags()
+          dsl_pool_hold()
+            dsl_pool_config_enter()
+              rrw_enter(&dp->dp_config_rwlock, RW_READER, tag);
+    sget()
+      sget_userns()
+        grab_super()
+          down_write(&s->s_umount); <- Waiting on C
+
+-- THREAD C --
+cleanup_mnt()
+  deactivate_super()
+    down_write(&s->s_umount);
+    deactivate_locked_super()
+      zpl_kill_sb()
+        kill_anon_super()
+          generic_shutdown_super()
+            sync_filesystem()
+              zpl_sync_fs()
+                zfs_sync()
+                  zil_commit()
+                    txg_wait_synced() <- Waiting on A
+
+Reviewed by: Alek Pinchuk <apinchuk@datto.com>
+Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
+Closes #7598
+Closes #7659
+Closes #7691
+Closes #7693
+---
+ include/sys/zfs_vfsops.h |  1 +
+ module/zfs/zpl_super.c   | 11 ++++++++++-
+ 2 files changed, 11 insertions(+), 1 deletion(-)
+
+diff --git a/include/sys/zfs_vfsops.h b/include/sys/zfs_vfsops.h
+index febfdff97f2..31c9c6d7f74 100644
+--- a/include/sys/zfs_vfsops.h
++++ b/include/sys/zfs_vfsops.h
+@@ -32,6 +32,7 @@
+ #include <sys/zil.h>
+ #include <sys/sa.h>
+ #include <sys/rrwlock.h>
++#include <sys/dsl_dataset.h>
+ #include <sys/zfs_ioctl.h>
+ 
+ #ifdef	__cplusplus
+diff --git a/module/zfs/zpl_super.c b/module/zfs/zpl_super.c
+index fc10271b787..5c426b0a9fb 100644
+--- a/module/zfs/zpl_super.c
++++ b/module/zfs/zpl_super.c
+@@ -271,8 +271,17 @@ zpl_mount_impl(struct file_system_type *fs_type, int flags, zfs_mnt_t *zm)
+ 	if (err)
+ 		return (ERR_PTR(-err));
+ 
++	/*
++	 * The dsl pool lock must be released prior to calling sget().
++	 * It is possible sget() may block on the lock in grab_super()
++	 * while deactivate_super() holds that same lock and waits for
++	 * a txg sync.  If the dsl_pool lock is held over over sget()
++	 * this can prevent the pool sync and cause a deadlock.
++	 */
++	dsl_pool_rele(dmu_objset_pool(os), FTAG);
+ 	s = zpl_sget(fs_type, zpl_test_super, set_anon_super, flags, os);
+-	dmu_objset_rele(os, FTAG);
++	dsl_dataset_rele(dmu_objset_ds(os), FTAG);
++
+ 	if (IS_ERR(s))
+ 		return (ERR_CAST(s));
+