From d161c321ee0ed0def8af5526fda5540dfe8c9839 Mon Sep 17 00:00:00 2001
From: Tobias Powalowski <tpowa@archlinux.org>
Date: Wed, 8 Apr 2015 06:49:55 +0000
Subject: [PATCH] fix btrfs deadlock on mount

---
 0001-fix-btrfs-mount-deadlock.patch | 43 +++++++++++++++++++++++++++++
 PKGBUILD                            | 11 ++++++--
 2 files changed, 51 insertions(+), 3 deletions(-)
 create mode 100644 0001-fix-btrfs-mount-deadlock.patch

diff --git a/0001-fix-btrfs-mount-deadlock.patch b/0001-fix-btrfs-mount-deadlock.patch
new file mode 100644
index 0000000..9430d58
--- /dev/null
+++ b/0001-fix-btrfs-mount-deadlock.patch
@@ -0,0 +1,43 @@
+From 9c4f61f01d269815bb7c37be3ede59c5587747c6 Mon Sep 17 00:00:00 2001
+From: David Sterba <dsterba@suse.cz>
+Date: Fri, 2 Jan 2015 19:12:57 +0100
+Subject: btrfs: simplify insert_orphan_item
+
+We can search and add the orphan item in one go,
+btrfs_insert_orphan_item will find out if the item already exists.
+
+Signed-off-by: David Sterba <dsterba@suse.cz>
+
+diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
+index 5be45c1..25a1c36 100644
+--- a/fs/btrfs/tree-log.c
++++ b/fs/btrfs/tree-log.c
+@@ -1254,21 +1254,13 @@ out:
+ }
+ 
+ static int insert_orphan_item(struct btrfs_trans_handle *trans,
+-			      struct btrfs_root *root, u64 offset)
++			      struct btrfs_root *root, u64 ino)
+ {
+ 	int ret;
+-	struct btrfs_path *path;
+-
+-	path = btrfs_alloc_path();
+-	if (!path)
+-		return -ENOMEM;
+ 
+-	ret = btrfs_find_item(root, path, BTRFS_ORPHAN_OBJECTID,
+-			offset, BTRFS_ORPHAN_ITEM_KEY, NULL);
+-	if (ret > 0)
+-		ret = btrfs_insert_orphan_item(trans, root, offset);
+-
+-	btrfs_free_path(path);
++	ret = btrfs_insert_orphan_item(trans, root, ino);
++	if (ret == -EEXIST)
++		ret = 0;
+ 
+ 	return ret;
+ }
+-- 
+cgit v0.10.2
+
diff --git a/PKGBUILD b/PKGBUILD
index 94b01da..04b3ad5 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -5,7 +5,7 @@ pkgbase=linux               # Build stock -ARCH kernel
 #pkgbase=linux-custom       # Build kernel with a different name
 _srcname=linux-3.19
 pkgver=3.19.3
-pkgrel=1
+pkgrel=2
 arch=('i686' 'x86_64')
 url="http://www.kernel.org/"
 license=('GPL2')
@@ -20,7 +20,7 @@ source=("https://www.kernel.org/pub/linux/kernel/v3.x/${_srcname}.tar.xz"
         # standard config files for mkinitcpio ramdisk
         'linux.preset'
         'change-default-console-loglevel.patch'
-        )
+        '0001-fix-btrfs-mount-deadlock.patch')
 sha256sums=('be42511fe5321012bb4a2009167ce56a9e5fe362b4af43e8c371b3666859806c'
             'SKIP'
             'cd9474b61b859d68f83ff0b769bafef8489d2090e0a933d2a7e5f76a23cc071a'
@@ -28,7 +28,8 @@ sha256sums=('be42511fe5321012bb4a2009167ce56a9e5fe362b4af43e8c371b3666859806c'
             '704a479de77c9022e5c7a797d2cd7fd0e4ba1f52f9039ec8a80efd57f7e9f0d8'
             '59830f47c1be39f874640d762dca55f972aca549a7a65ba2f1dac184251dabb2'
             'f0d90e756f14533ee67afda280500511a62465b4f76adcc5effa95a40045179c'
-            '1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99')
+            '1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99'
+            '5967cf53cb9db9f070e8f346c3d7045748e4823a7fe2ee330acd18c9d02bbb77')
 validpgpkeys=(
               'ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linus Torvalds
               '647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman
@@ -50,6 +51,10 @@ prepare() {
   # (relevant patch sent upstream: https://lkml.org/lkml/2011/7/26/227)
   patch -p1 -i "${srcdir}/change-default-console-loglevel.patch"
 
+  # fix #44495 and #44385 deadlock on btrfs mount
+  # https://btrfs.wiki.kernel.org/index.php/Gotchas
+  patch -Np1 -i "${srcdir}/0001-fix-btrfs-mount-deadlock.patch"
+
   if [ "${CARCH}" = "x86_64" ]; then
     cat "${srcdir}/config.x86_64" > ./.config
   else