a7112a309a
在aarch64平台64K页大小情况下，osd采用direct write写superblock到地址8k-12k， 采用buffer write写设备标签到地址0-4k，针对buffer write操作系统会按页对齐刷盘， superblock和设备标签刚好在同一个页上，刷盘导致superblock被覆盖，无法读出正确的数据。 将写设备标签改成direct write修复此问题。 Signed-off-by: luo rixin <luorixin@huawei.com>
44 lines
1.6 KiB
Diff
44 lines
1.6 KiB
Diff
From 7672ceb4f09c81ee7a2d5e8672e2c402c3206b4e Mon Sep 17 00:00:00 2001
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From: luo rixin <luorixin@huawei.com>
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Date: Wed, 14 Sep 2022 19:50:01 +0800
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Subject: [PATCH] os/bluestore: use direct write in
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BlueStore::_write_bdev_label
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On AArch64 with kernel page size 64K, it occurs occasionally
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"OSD::init(): unable to read osd superblock" when deploying osd.
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As bluestore use direct write to write the superblock at 0x2000~1000
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and BlueStore::_write_bdev_label use buffer write to write label at
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0x0~1000, The OS flush the buffer write algined to page size, it will
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overwrite the superblock(0x2000~1000). Use driect write to avoid
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overwriting the superblock.
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Fixes: https://tracker.ceph.com/issues/57537
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Signed-off-by: luo rixin <luorixin@huawei.com>
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---
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src/os/bluestore/BlueStore.cc | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
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index 8b893be79d1..534fe780f27 100644
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--- a/src/os/bluestore/BlueStore.cc
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+++ b/src/os/bluestore/BlueStore.cc
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@@ -5104,13 +5104,14 @@ int BlueStore::_write_bdev_label(CephContext *cct,
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z.zero();
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bl.append(std::move(z));
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- int fd = TEMP_FAILURE_RETRY(::open(path.c_str(), O_WRONLY|O_CLOEXEC));
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+ int fd = TEMP_FAILURE_RETRY(::open(path.c_str(), O_WRONLY|O_CLOEXEC|O_DIRECT));
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if (fd < 0) {
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fd = -errno;
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derr << __func__ << " failed to open " << path << ": " << cpp_strerror(fd)
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<< dendl;
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return fd;
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}
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+ bl.rebuild_aligned_size_and_memory(BDEV_LABEL_BLOCK_SIZE, BDEV_LABEL_BLOCK_SIZE, IOV_MAX);
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int r = bl.write_fd(fd);
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if (r < 0) {
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derr << __func__ << " failed to write to " << path
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--
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2.20.1.windows.1
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