From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Andrea Parri <andrea.parri@amarulasolutions.com>,
"Paul E. McKenney" <paulmck@linux.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
"Yan, Zheng" <zyan@redhat.com>, Ilya Dryomov <idryomov@gmail.com>,
Sasha Levin <sashal@kernel.org>,
ceph-devel@vger.kernel.org
Subject: [PATCH AUTOSEL 4.4 08/23] ceph: fix improper use of smp_mb__before_atomic()
Date: Fri, 26 Jul 2019 09:45:07 -0400 [thread overview]
Message-ID: <20190726134522.13308-8-sashal@kernel.org> (raw)
In-Reply-To: <20190726134522.13308-1-sashal@kernel.org>
From: Andrea Parri <andrea.parri@amarulasolutions.com>
[ Upstream commit 749607731e26dfb2558118038c40e9c0c80d23b5 ]
This barrier only applies to the read-modify-write operations; in
particular, it does not apply to the atomic64_set() primitive.
Replace the barrier with an smp_mb().
Fixes: fdd4e15838e59 ("ceph: rework dcache readdir")
Reported-by: "Paul E. McKenney" <paulmck@linux.ibm.com>
Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrea Parri <andrea.parri@amarulasolutions.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/ceph/super.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 8c8cb8fe3d32..5d05c77c158d 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -474,7 +474,12 @@ static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
long long release_count,
long long ordered_count)
{
- smp_mb__before_atomic();
+ /*
+ * Makes sure operations that setup readdir cache (update page
+ * cache and i_size) are strongly ordered w.r.t. the following
+ * atomic64_set() operations.
+ */
+ smp_mb();
atomic64_set(&ci->i_complete_seq[0], release_count);
atomic64_set(&ci->i_complete_seq[1], ordered_count);
}
--
2.20.1
next prev parent reply other threads:[~2019-07-26 13:45 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-26 13:45 [PATCH AUTOSEL 4.4 01/23] ARM: riscpc: fix DMA Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 02/23] ARM: dts: rockchip: Mark that the rk3288 timer might stop in suspend Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 03/23] kernel/module.c: Only return -EEXIST for modules that have finished loading Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 04/23] MIPS: lantiq: Fix bitfield masking Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 05/23] dmaengine: rcar-dmac: Reject zero-length slave DMA requests Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 06/23] fs/adfs: super: fix use-after-free bug Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 07/23] btrfs: fix minimum number of chunk errors for DUP Sasha Levin
2019-07-26 13:45 ` Sasha Levin [this message]
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 09/23] scsi: zfcp: fix GCC compiler warning emitted with -Wmaybe-uninitialized Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 10/23] ACPI: fix false-positive -Wuninitialized warning Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 11/23] ISDN: hfcsusb: checking idx of ep configuration Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 12/23] be2net: Signal that the device cannot transmit during reconfiguration Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 13/23] x86/apic: Silence -Wtype-limits compiler warnings Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 14/23] x86: math-emu: Hide clang warnings for 16-bit overflow Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 15/23] mm/cma.c: fail if fixed declaration can't be honored Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 16/23] coda: add error handling for fget Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 17/23] coda: fix build using bare-metal toolchain Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 18/23] uapi linux/coda_psdev.h: move upc_req definition from uapi to kernel side headers Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 19/23] drivers/pps/pps.c: clear offset flags in PPS_SETPARAMS ioctl Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 20/23] ipc/mqueue.c: only perform resource calculation if user valid Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 21/23] floppy: fix div-by-zero in setup_format_params Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 22/23] floppy: fix out-of-bounds read in copy_buffer Sasha Levin
2019-07-26 13:45 ` [PATCH AUTOSEL 4.4 23/23] x86/kvm: Don't call kvm_spurious_fault() from .fixup Sasha Levin
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