ubifs: 空间预算失效在末端场景写入导致文件系统变只读

【标题描述】ubifs: 空间预算失效在末端场景写入导致文件系统变只读
【环境信息】
硬件信息：
NA
软件信息：
OLK-5.10
【问题复现步骤】
CONFIG_UBIFS_FS=m
CONFIG_MTD_UBI=m
CONFIG_MTD_NAND_NANDSIM=m
挂载UBIFS到temp，./xfstests/ltp/fsstress -l0 -n1000 -p4 -d /root/temp
一段时间后ubifs make_revervation报ENOSPC错误，文件系统概率变只读

出现概率(是否必现，概率性错误)概率复现
【预期结果】
make_revervation报ENOSPC错误，文件系统概率变只读
【实际结果】
```
[ 691.403798] UBIFS warning (ubi0:0 pid 3100): ubifs_vm_page_mkwrite: out of space for mmapped file (inode number 75138)
[ 691.462202] UBIFS error (ubi0:0 pid 3033): make_reservation: cannot reserve 92 bytes in jhead 2, error -28
[ 691.464098] CPU: 1 PID: 3033 Comm: kworker/u8:1 Not tainted 4.4.302-02377-g6d916ebe811d #138
[ 691.466177] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc314
[ 691.469900] Workqueue: writeback wb_workfn (flush-ubifs_0_0)
[ 691.471238] 0000000000000202 0644322e2ed4c100 ffff8802353a3828 ffffffffafc27969
[ 691.472846] ffff8800ba2014a8 ffff8800ba201000 ffff8802353a38c0 ffffffffc01f9ae6
[ 691.474519] 0000000000000002 0644322effffffe4 ffff8800ba074800 ffff8800ba074800
[ 691.476315] Call Trace:
[ 691.476802] [<ffffffffafc27969>] dump_stack+0xcd/0x100
[ 691.478172] [<ffffffffc01f9ae6>] make_reservation.cold+0x77/0x230 [ubifs]
[ 691.479943] [<ffffffffc01bc034>] ubifs_jnl_write_data+0x2b4/0x5e0 [ubifs]
[ 691.481627] [<ffffffffaf267c05>] ? __test_set_page_writeback+0x195/0x300
[ 691.483437] [<ffffffffc01c1a67>] do_writepage+0x207/0x2b0 [ubifs]
[ 691.485243] [<ffffffffc01e04d2>] ? ubifs_release_dirty_inode_budget+0x52/0x70 [ubifs]
[ 691.487214] [<ffffffffc01c1c34>] ubifs_writepage+0x124/0x350 [ubifs]
[ 691.488754] [<ffffffffaf26454f>] __writepage+0x1f/0xa0
[ 691.490092] [<ffffffffaf264f6b>] write_cache_pages+0x1db/0x730
[ 691.491228] [<ffffffffaf264530>] ? tag_pages_for_writeback+0x140/0x140
[ 691.492346] [<ffffffffc01bc93e>] ? ubifs_jnl_write_inode+0x5de/0x6c0 [ubifs]
[ 691.493702] [<ffffffffaf265522>] generic_writepages+0x62/0xb0
[ 691.495019] [<ffffffffafc584aa>] ? mutex_lock+0x1a/0x70
[ 691.496023] [<ffffffffaf268a58>] do_writepages+0x48/0x60
[ 691.497048] [<ffffffffaf36bb18>] __writeback_single_inode+0x68/0x650
[ 691.498487] [<ffffffffaf12b6fe>] ? wake_up_bit+0x2e/0x40
[ 691.499955] [<ffffffffaf36d718>] writeback_sb_inodes+0x288/0x820
[ 691.501206] [<ffffffffaf36defd>] wb_writeback+0x11d/0x570
[ 691.502233] [<ffffffffaf36edba>] wb_workfn+0x16a/0x680
[ 691.503122] [<ffffffffaf0ee5da>] process_one_work+0x27a/0x790
[ 691.504310] [<ffffffffaf0ef365>] worker_thread+0x2b5/0x800
[ 691.505966] [<ffffffffaf0ef0b0>] ? rescuer_thread+0x5c0/0x5c0
[ 691.507657] [<ffffffffaf0f7b67>] kthread+0x117/0x150
[ 691.508890] [<ffffffffaf0f7a50>] ? flush_kthread_work+0x1d0/0x1d0
[ 691.510389] [<ffffffffafc5c49f>] ret_from_fork+0x3f/0x70
[ 691.511841] [<ffffffffaf0f7a50>] ? flush_kthread_work+0x1d0/0x1d0
```
【附件信息】
空间预算算法问题：https://bugzilla.kernel.org/show_bug.cgi?id=216562
rename场景问题：
https://bugzilla.kernel.org/show_bug.cgi?id=216494
https://bugzilla.kernel.org/show_bug.cgi?id=216569
加密场景符号链接问题：https://bugzilla.kernel.org/show_bug.cgi?id=216490

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