[openEuler 20-03/SP1] 版本内核，放开btrfs相关配置后，执行ltp测试失败

### 【标题描述】20.03-sp1 版本内核，放开btrfs相关配置后，执行ltp测试失败
### 【环境信息】
##### 硬件信息：
kvm vm
##### 软件信息：
```
[root@localhost ltp]# cat /etc/os-release 
NAME="openEuler"
VERSION="20.03 (LTS-SP1)"
ID="openEuler"
VERSION_ID="20.03"
PRETTY_NAME="openEuler 20.03 (LTS-SP1)"
ANSI_COLOR="0;31"

[root@localhost ltp]# uname -m
aarch64
[root@localhost ltp]# uname -r
4.19.90-2012.5.0.0054.oe1.aarch64
```
【问题复现步骤】
1. 修改kernel 配置
```
--- a/arch/arm64/configs/openeuler_defconfig
+++ b/arch/arm64/configs/openeuler_defconfig
@@ -5142,7 +5142,8 @@ CONFIG_XFS_POSIX_ACL=y
 # CONFIG_XFS_DEBUG is not set
 # CONFIG_GFS2_FS is not set
 # CONFIG_OCFS2_FS is not set
-# CONFIG_BTRFS_FS is not set
+CONFIG_BTRFS_FS=y
+CONFIG_BTRFS_FS_POSIX_ACL=y

--- a/arch/x86/configs/openeuler_defconfig
+++ b/arch/x86/configs/openeuler_defconfig
@@ -6618,7 +6618,8 @@ CONFIG_XFS_POSIX_ACL=y
 CONFIG_GFS2_FS=m
 CONFIG_GFS2_FS_LOCKING_DLM=y
 # CONFIG_OCFS2_FS is not set
-# CONFIG_BTRFS_FS is not set
+CONFIG_BTRFS_FS=y
+CONFIG_BTRFS_FS_POSIX_ACL=y
```
2.重新编译内核
3. 执行ltp测试，测试命令为 `./runltp -f syscalls -s fallocate06`
【预期结果】
无失败项
【实际结果】
```
tst_test.c:1329: TINFO: Testing on btrfs
tst_test.c:859: TINFO: Formatting /dev/loop0 with btrfs opts='' extra opts=''
tst_test.c:1263: TINFO: Timeout per run is 0h 05m 00s
fallocate06.c:117: TINFO: Copy-on-write is supported
fallocate06.c:168: TINFO: Case 1. Fill FS: no; Use copy on write: no
fallocate06.c:157: TPASS: write() successful
fallocate06.c:201: TPASS: Misaligned allocation works as expected
fallocate06.c:157: TPASS: fallocate(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE) successful
fallocate06.c:237: TPASS: fallocate(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE) cleared the correct file range
fallocate06.c:168: TINFO: Case 2. Fill FS: yes; Use copy on write: no
tst_fill_fs.c:32: TINFO: Creating file mntpoint/file0 size 21710183
tst_fill_fs.c:32: TINFO: Creating file mntpoint/file1 size 8070086
tst_fill_fs.c:32: TINFO: Creating file mntpoint/file2 size 3971177
tst_fill_fs.c:32: TINFO: Creating file mntpoint/file3 size 36915315
tst_fill_fs.c:32: TINFO: Creating file mntpoint/file4 size 70310993
tst_fill_fs.c:32: TINFO: Creating file mntpoint/file5 size 4807935
tst_fill_fs.c:32: TINFO: Creating file mntpoint/file6 size 90739786
tst_fill_fs.c:32: TINFO: Creating file mntpoint/file7 size 76896492
tst_fill_fs.c:32: TINFO: Creating file mntpoint/file8 size 72228649
tst_fill_fs.c:32: TINFO: Creating file mntpoint/file9 size 36207821
tst_fill_fs.c:32: TINFO: Creating file mntpoint/file10 size 81483962
tst_fill_fs.c:59: TINFO: write(): ENOSPC (28)
fallocate06.c:157: TPASS: write() successful
fallocate06.c:201: TPASS: Misaligned allocation works as expected
fallocate06.c:146: TFAIL: fallocate(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE) failed unexpectedly: ENOSPC (28)
fallocate06.c:168: TINFO: Case 3. Fill FS: no; Use copy on write: yes
fallocate06.c:157: TPASS: write() successful
```
存在fallocate06.c:146: TFAIL: fallocate(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE) failed unexpectedly: ENOSPC (28) 失败项
【附件信息】

GVP openEuler/kernel

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GVPopenEuler/kernel

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