diff options
Diffstat (limited to 'linux-5.5-compat-blkg_tryget.patch')
| -rw-r--r-- | linux-5.5-compat-blkg_tryget.patch | 136 |
1 files changed, 0 insertions, 136 deletions
diff --git a/linux-5.5-compat-blkg_tryget.patch b/linux-5.5-compat-blkg_tryget.patch deleted file mode 100644 index f636e87f805a..000000000000 --- a/linux-5.5-compat-blkg_tryget.patch +++ /dev/null @@ -1,136 +0,0 @@ -From 2fcab8795c7c493845bfa277d44bc443802000b8 Mon Sep 17 00:00:00 2001 -From: Brian Behlendorf <behlendorf1@llnl.gov> -Date: Fri, 28 Feb 2020 08:58:39 -0800 -Subject: [PATCH] Linux 5.5 compat: blkg_tryget() - -Commit https://github.com/torvalds/linux/commit/9e8d42a0f accidentally -converted the static inline function blkg_tryget() to GPL-only for -kernels built with CONFIG_PREEMPT_RCU=y and CONFIG_BLK_CGROUP=y. - -Resolve the build issue by providing our own equivalent functionality -when needed which uses rcu_read_lock_sched() internally as before. - -Reviewed-by: Tony Hutter <hutter2@llnl.gov> -Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> -Closes #9745 -Closes #10072 ---- - config/kernel-blkg-tryget.m4 | 37 ++++++++++++++++++++++++++++++++++++ - config/kernel.m4 | 2 ++ - module/zfs/vdev_disk.c | 32 ++++++++++++++++++++++++++++++- - 3 files changed, 70 insertions(+), 1 deletion(-) - create mode 100644 config/kernel-blkg-tryget.m4 - -diff --git a/config/kernel-blkg-tryget.m4 b/config/kernel-blkg-tryget.m4 -new file mode 100644 -index 00000000000..fb831ca3b3e ---- /dev/null -+++ b/config/kernel-blkg-tryget.m4 -@@ -0,0 +1,37 @@ -+dnl # -+dnl # Linux 5.5 API, -+dnl # -+dnl # The Linux 5.5 kernel updated percpu_ref_tryget() which is inlined by -+dnl # blkg_tryget() to use rcu_read_lock() instead of rcu_read_lock_sched(). -+dnl # As a side effect the function was converted to GPL-only. -+dnl # -+AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKG_TRYGET], [ -+ ZFS_LINUX_TEST_SRC([blkg_tryget], [ -+ #include <linux/blk-cgroup.h> -+ #include <linux/bio.h> -+ #include <linux/fs.h> -+ ],[ -+ struct blkcg_gq blkg __attribute__ ((unused)); -+ bool rc __attribute__ ((unused)); -+ rc = blkg_tryget(&blkg); -+ ], [], [$ZFS_META_LICENSE]) -+]) -+ -+AC_DEFUN([ZFS_AC_KERNEL_BLKG_TRYGET], [ -+ AC_MSG_CHECKING([whether blkg_tryget() is available]) -+ ZFS_LINUX_TEST_RESULT([blkg_tryget], [ -+ AC_MSG_RESULT(yes) -+ AC_DEFINE(HAVE_BLKG_TRYGET, 1, [blkg_tryget() is available]) -+ -+ AC_MSG_CHECKING([whether blkg_tryget() is GPL-only]) -+ ZFS_LINUX_TEST_RESULT([blkg_tryget_license], [ -+ AC_MSG_RESULT(no) -+ ],[ -+ AC_MSG_RESULT(yes) -+ AC_DEFINE(HAVE_BLKG_TRYGET_GPL_ONLY, 1, -+ [blkg_tryget() GPL-only]) -+ ]) -+ ],[ -+ AC_MSG_RESULT(no) -+ ]) -+]) -diff --git a/config/kernel.m4 b/config/kernel.m4 -index dce619729d4..bea6f9b1bbf 100644 ---- a/config/kernel.m4 -+++ b/config/kernel.m4 -@@ -70,6 +70,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [ - ZFS_AC_KERNEL_SRC_BIO_BI_STATUS - ZFS_AC_KERNEL_SRC_BIO_RW_BARRIER - ZFS_AC_KERNEL_SRC_BIO_RW_DISCARD -+ ZFS_AC_KERNEL_SRC_BLKG_TRYGET - ZFS_AC_KERNEL_SRC_BLK_QUEUE_BDI - ZFS_AC_KERNEL_SRC_BLK_QUEUE_DISCARD - ZFS_AC_KERNEL_SRC_BLK_QUEUE_SECURE_ERASE -@@ -186,6 +187,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [ - ZFS_AC_KERNEL_BIO_BI_STATUS - ZFS_AC_KERNEL_BIO_RW_BARRIER - ZFS_AC_KERNEL_BIO_RW_DISCARD -+ ZFS_AC_KERNEL_BLKG_TRYGET - ZFS_AC_KERNEL_BLK_QUEUE_BDI - ZFS_AC_KERNEL_BLK_QUEUE_DISCARD - ZFS_AC_KERNEL_BLK_QUEUE_SECURE_ERASE -diff --git a/module/zfs/vdev_disk.c b/module/zfs/vdev_disk.c -index 661f0f1b727..8544bb8ffb6 100644 ---- a/module/zfs/vdev_disk.c -+++ b/module/zfs/vdev_disk.c -@@ -473,6 +473,36 @@ vdev_submit_bio_impl(struct bio *bio) - - #ifdef HAVE_BIO_SET_DEV - #if defined(CONFIG_BLK_CGROUP) && defined(HAVE_BIO_SET_DEV_GPL_ONLY) -+/* -+ * The Linux 5.5 kernel updated percpu_ref_tryget() which is inlined by -+ * blkg_tryget() to use rcu_read_lock() instead of rcu_read_lock_sched(). -+ * As a side effect the function was converted to GPL-only. Define our -+ * own version when needed which uses rcu_read_lock_sched(). -+ */ -+#if defined(HAVE_BLKG_TRYGET_GPL_ONLY) -+static inline bool -+vdev_blkg_tryget(struct blkcg_gq *blkg) -+{ -+ struct percpu_ref *ref = &blkg->refcnt; -+ unsigned long __percpu *count; -+ bool rc; -+ -+ rcu_read_lock_sched(); -+ -+ if (__ref_is_percpu(ref, &count)) { -+ this_cpu_inc(*count); -+ rc = true; -+ } else { -+ rc = atomic_long_inc_not_zero(&ref->count); -+ } -+ -+ rcu_read_unlock_sched(); -+ -+ return (rc); -+} -+#elif defined(HAVE_BLKG_TRYGET) -+#define vdev_blkg_tryget(bg) blkg_tryget(bg) -+#endif - /* - * The Linux 5.0 kernel updated the bio_set_dev() macro so it calls the - * GPL-only bio_associate_blkg() symbol thus inadvertently converting -@@ -487,7 +517,7 @@ vdev_bio_associate_blkg(struct bio *bio) - ASSERT3P(q, !=, NULL); - ASSERT3P(bio->bi_blkg, ==, NULL); - -- if (q->root_blkg && blkg_tryget(q->root_blkg)) -+ if (q->root_blkg && vdev_blkg_tryget(q->root_blkg)) - bio->bi_blkg = q->root_blkg; - } - #define bio_associate_blkg vdev_bio_associate_blkg |