调用backupOneToDirectory做备份失败

[Yuanxilin]

Note:

An crash issue will be ignored & closed in a week without logs.

The language of MMKV

Java

The version of MMKV

1.3.9

The platform of MMKV

Android

The installation of MMKV

Gradle

What's the issue?

I failed to call backupOneToDirectory.
The original code is

  `boolean ret1 = MMKV.backupOneToDirectory("osds", GlobalParam.applicationContext.getFilesDir().getAbsolutePath() + "/mmkvbackup", null);`

What's the log of MMKV when that happened?

11-12 18:31:53.639 I/MMKV ( 2518): current API level = 25, libc++_shared=0
11-12 18:31:53.640 I/MMKV ( 2518): MMKV.cpp:166::initialize version v1.3.9, page size 4096, arch arm64-v8a
11-12 18:31:53.640 I/MMKV ( 2518): MMKV.cpp:177::initialize armv8 AES instructions is supported
11-12 18:31:53.640 I/MMKV ( 2518): MMKV.cpp:185::initialize armv8 CRC32 instructions is supported
11-12 18:31:53.640 I/MMKV ( 2518): MMKV.cpp:225::initializeMMKV root dir: /mnt/sdcard/
11-12 18:31:53.640 I/MMKV ( 2518): MemoryFile.cpp:98::open open fd[0x23], /mnt/sdcard//osds
11-12 18:31:53.640 I/MMKV ( 2518): MemoryFile.cpp:203::mmap mmap to address [0x79797e6000], oldPtr [0x0], [/mnt/sdcard//osds]
11-12 18:31:53.640 I/MMKV ( 2518): MemoryFile.cpp:98::open open fd[0x24], /mnt/sdcard//osds.crc
11-12 18:31:53.640 I/MMKV ( 2518): MemoryFile.cpp:203::mmap mmap to address [0x79557a3000], oldPtr [0x0], [/mnt/sdcard//osds.crc]
11-12 18:31:53.641 I/MMKV ( 2518): <MMKV_IO.cpp:214::loadMetaInfoAndCheck> meta file [osds] has flag [0]
11-12 18:31:53.641 I/MMKV ( 2518): <MMKV_IO.cpp:84::loadFromFile> loading [osds] with 2398 actual size, file size 4096, InterProcess 0, meta info version:4
11-12 18:31:53.641 I/MMKV ( 2518): <MMKV_IO.cpp:89::loadFromFile> loading [osds] with crc 3049731699 sequence 27 version 4
11-12 18:31:53.641 I/MMKV ( 2518): <MMKV_IO.cpp:133::loadFromFile> loaded [osds] with 81 key-values
11-12 18:31:54.423 I/MMKV ( 2593): current API level = 25, libc++_shared=0
11-12 18:31:54.423 I/MMKV ( 2593): MMKV.cpp:166::initialize version v1.3.9, page size 4096, arch arm64-v8a
11-12 18:31:54.424 I/MMKV ( 2593): MMKV.cpp:177::initialize armv8 AES instructions is supported
11-12 18:31:54.424 I/MMKV ( 2593): MMKV.cpp:185::initialize armv8 CRC32 instructions is supported
11-12 18:31:54.424 I/MMKV ( 2593): MMKV.cpp:225::initializeMMKV root dir: /mnt/sdcard/
11-12 18:31:54.424 I/MMKV ( 2593): MemoryFile.cpp:98::open open fd[0x23], /mnt/sdcard//osds
11-12 18:31:54.424 I/MMKV ( 2593): MemoryFile.cpp:203::mmap mmap to address [0x79592da000], oldPtr [0x0], [/mnt/sdcard//osds]
11-12 18:31:54.425 I/MMKV ( 2593): MemoryFile.cpp:98::open open fd[0x24], /mnt/sdcard//osds.crc
11-12 18:31:54.425 I/MMKV ( 2593): MemoryFile.cpp:203::mmap mmap to address [0x795559b000], oldPtr [0x0], [/mnt/sdcard//osds.crc]
11-12 18:31:54.426 I/MMKV ( 2593): <MMKV_IO.cpp:214::loadMetaInfoAndCheck> meta file [osds] has flag [0]
11-12 18:31:54.426 I/MMKV ( 2593): <MMKV_IO.cpp:84::loadFromFile> loading [osds] with 2544 actual size, file size 4096, InterProcess 0, meta info version:4
11-12 18:31:54.426 I/MMKV ( 2593): <MMKV_IO.cpp:89::loadFromFile> loading [osds] with crc 2870570006 sequence 27 version 4
11-12 18:31:54.426 I/MMKV ( 2593): <MMKV_IO.cpp:133::loadFromFile> loaded [osds] with 81 key-values
11-12 18:31:54.718 I/MMKV ( 2518): MMKV.cpp:1263::backupOneToDirectory backup one cached mmkv[osds] from [/mnt/sdcard//osds] to [/data/user/0/com.brawin.brplay/files/mmkvbackup/osds]
11-12 18:31:54.718 I/MMKV ( 2518): MMKV.cpp:1174::sync MMKV::sync, SyncFlag = 1
11-12 18:31:54.726 I/MMKV ( 2518): MemoryFile.cpp:98::open open fd[0x5a], /mnt/sdcard//osds
11-12 18:31:54.726 I/MMKV ( 2518): <MemoryFile_Linux.cpp:118::copyFileContent> copy content from /mnt/sdcard//osds to fd[89] finish
11-12 18:31:54.726 I/MMKV ( 2518): MemoryFile.cpp:104::close closing fd[0x5a], /mnt/sdcard//osds
11-12 18:31:54.726 I/MMKV ( 2518): MemoryFile.cpp:507::copyFile copyfile [/mnt/sdcard//osds] to [/mnt/sdcard//.tmp/MMKV.D5zUMK]
11-12 18:31:54.726 W/MMKV ( 2518): <MemoryFile_Linux.cpp:65::tryAtomicRename> fail on renameat2() [/mnt/sdcard//.tmp/MMKV.D5zUMK] to [/data/user/0/com.brawin.brplay/files/mmkvbackup/osds], 88(Socket operation on non-socket)
11-12 18:31:54.726 W/MMKV ( 2518): <MemoryFile_Linux.cpp:73::tryAtomicRename> fail on syscall(SYS_renameat2) [/mnt/sdcard//.tmp/MMKV.D5zUMK] to [/data/user/0/com.brawin.brplay/files/mmkvbackup/osds], 18(Cross-device link)
11-12 18:31:54.727 E/MMKV ( 2518): <MemoryFile_Linux.cpp:79::tryAtomicRename> fail to rename [/mnt/sdcard//.tmp/MMKV.D5zUMK] to [/data/user/0/com.brawin.brplay/files/mmkvbackup/osds], 18(Cross-device link)
11-12 18:31:54.728 I/MMKV ( 2518): MMKV.cpp:1274::backupOneToDirectory finish backup one mmkv[osds], ret: 0

[lingol]

There's some logic on handling opened MMKV files that don't handle failure on rename() correctly on cross-device operation.
Try do it on the same storage device.