{"id":5048,"date":"2023-12-27T11:17:23","date_gmt":"2023-12-27T03:17:23","guid":{"rendered":"https:\/\/blog.coderfan.org\/?p=5048"},"modified":"2023-12-29T10:11:37","modified_gmt":"2023-12-29T02:11:37","slug":"android12-1-file-system-mount-progress","status":"publish","type":"post","link":"https:\/\/blog.coderfan.org\/en\/android12-1-file-system-mount-progress.html","title":{"rendered":"Android12.1\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u6d41\u7a0b\u7b80\u8981\u5206\u6790"},"content":{"rendered":"
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\n \t<\/i> Read Time:<\/span>6 Minute, 1 Second <\/div>\n\n <\/div>\n

\u6587\u4ef6\u7cfb\u7edf\u662f\u6bcf\u4e00\u4e2a\u7cfb\u7edf\u76f8\u5173\u7684\u6280\u672f\u4eba\u5458\u4e0d\u5f97\u4e0d\u63a5\u89e6\u7684\u4e00\u7c7b\u6a21\u5757\uff0c\u5176\u5305\u542b\u7684\u77e5\u8bc6\u70b9\u975e\u5e38\u4e30\u5bcc\uff0c\u6d89\u53ca\u7684\u77e5\u8bc6\u9762\u4e5f\u975e\u5e38\u5e7f\uff0c\u4eca\u5929\u8fd9\u7bc7\u6587\u7ae0\u5c06\u9488\u5bf9Android12.1\u7cfb\u7edf\u7684\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u6d41\u7a0b\u505a\u4e00\u4e2a\u7b80\u8981\u5206\u6790\u3002<\/p>\n\n\n\n

Background<\/h2>\n\n\n\n

\u5728\u4e86\u89e3\u6587\u4ef6\u7cfb\u7edf\u524d\uff0c\u9700\u8981\u5148\u4e86\u89e3\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u4e00\u4e9b\u57fa\u7840\u6982\u5ff5\u3002<\/p>\n\n\n\n

\u76ee\u5f55<\/strong>\uff1a\u76ee\u5f55\u7528\u4e8e\u7ec4\u7ec7\u6587\u4ef6\u548c\u5b50\u76ee\u5f55\u7684\u7ed3\u6784\u3002\u901a\u8fc7\u76ee\u5f55\u6211\u4eec\u53ef\u4ee5\u5728\u6587\u4ef6\u7cfb\u7edf\u4e2d\u521b\u5efa\u76f8\u5e94\u7684\u5c42\u6b21\u7ed3\u6784\uff0c\u7528\u4e8e\u6211\u4eec\u5feb\u901f\u7d22\u5f15\u5230\u5177\u4f53\u7684\u6587\u4ef6\u6216\u8005\u5bf9\u6587\u4ef6\u8fdb\u884c\u76f8\u5e94\u7684\u7ec4\u7ec7\u3002<\/p>\n\n\n\n

\u5206\u533a<\/strong>\uff1a\u5206\u533a\u662f\u7269\u7406\u5b58\u50a8\u8bbe\u5907\uff08\u5982\u786c\u76d8\uff09\u4e0a\u7684\u4e00\u4e2a\u903b\u8f91\u90e8\u5206\uff0c\u6bcf\u4e2a\u5206\u533a\u53ef\u4ee5\u7528\u7279\u5b9a\u7684\u6587\u4ef6\u7cfb\u7edf\u683c\u5f0f\u8fdb\u884c\u683c\u5f0f\u5316\u3002\u4e0d\u540c\u7684\u5206\u533a\u53ef\u4ee5\u4f7f\u7528\u4e0d\u540c\u7684\u6587\u4ef6\u7cfb\u7edf\u683c\u5f0f\u3002\u4f46\u4e00\u4e2a\u5206\u533a\u53ea\u80fd\u6709\u4e00\u4e2a\u6587\u4ef6\u7cfb\u7edf\u683c\u5f0f\uff1b\u800c\u540c\u4e00\u5757\u513f\u786c\u76d8\u53ef\u4ee5\u6709\u591a\u4e2a\u5206\u533a\u3002<\/p>\n\n\n\n

\u6302\u8f7d\u70b9<\/strong>\uff1a\u6302\u8f7d\u70b9\u662f\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u4e00\u4e2a\u4f4d\u7f6e\uff0c\u4e00\u4e2a\u76ee\u5f55\u3002\u7528\u4e8e\u5c06\u4e00\u4e2a\u6587\u4ef6\u7cfb\u7edf\u4e0e\u6587\u4ef6\u7cfb\u7edf\u5c42\u6b21\u7ed3\u6784\u4e2d\u7684\u67d0\u4e2a\u5177\u4f53\u4f4d\u7f6e\u5173\u8054\u8d77\u6765\uff0c\u4e5f\u5c31\u662f\u8bf4\u6302\u8f7d\u70b9\u5176\u5b9e\u662f\u628a\u5206\u533a\u5173\u8054\u5230\u5177\u4f53\u76ee\u5f55\u7684\u3002<\/p>\n\n\n\n

\u6587\u4ef6\u7cfb\u7edf\u683c\u5f0f\uff1a<\/strong>\u6587\u4ef6\u7cfb\u7edf\u683c\u5f0f\u5b9a\u4e49\u4e86\u6570\u636e\u5728\u5b58\u50a8\u8bbe\u5907\u4e0a\u7684\u7ec4\u7ec7\u65b9\u5f0f\u548c\u5b58\u50a8\u7ed3\u6784\u3002\u4e0d\u540c\u7684\u6587\u4ef6\u7cfb\u7edf\u683c\u5f0f\u5177\u6709\u4e0d\u540c\u7684\u7279\u6027\u3001\u4f18\u7f3a\u70b9\u548c\u9002\u7528\u573a\u666f\u3002\u5e38\u89c1\u7684\u6587\u4ef6\u7cfb\u7edf\u683c\u5f0f\u5305\u62ec:FAT32,NTFS,EXT4,APFS\u7b49\u3002<\/p>\n\n\n\n

fstab<\/strong>\uff1a\u82f1\u6587\u5168\u79f0\u4e3aFile System Table\uff0c\u4e5f\u5c31\u662f\u6587\u4ef6\u7cfb\u7edf\u8868;\u7c7b\u4f3c\u4e8eKernel\u542f\u52a8\u4e2d\u6240\u6d89\u53ca\u5230\u7684dtb(\u8bbe\u5907\u6811)\uff0cfstab\u7528\u4e8e\u5b9a\u4e49\u7cfb\u7edf\u542f\u52a8\u65f6\u6302\u8f7d\u6587\u4ef6\u7cfb\u7edf\u7684\u65b9\u5f0f\u548c\u89c4\u5219\uff0c\u63cf\u8ff0\u4e86\u8bbe\u5907\u4e0a\u6587\u4ef6\u7cfb\u7edf\u7684\u5e03\u5c40\uff0c\u6307\u5b9a\u4e86\u5982\u4f55\u6302\u8f7d\u4e0d\u540c\u5206\u533a\u6216\u8005\u5b58\u50a8\u8bbe\u5907\uff0c\u5e76\u8bbe\u7f6e\u4e86\u6bcf\u4e2a\u6587\u4ef6\u7cfb\u7edf\u7684\u6302\u8f7d\u9009\u9879\u3002<\/p>\n\n\n\n

fstab\u7684\u914d\u7f6e\u9075\u5faa\u4e00\u5b9a\u7684\u8bed\u6cd5\u89c4\u5219\uff0c\u5177\u4f53\u53ef\u4ee5\u53c2\u8003\u5982\u4e0b\u793a\u4f8b\uff1a<\/p>\n\n\n\n

#<dev>  <mnt_point> <type>  <mnt_flags options> <fs_mgr_flags>\nsystem   \/system     ext4    ro,barrier=1     wait,slotselect\nvendor   \/vendor     ext4    ro,barrier=1     wait,slotselect,avb=vbmeta\nproduct  \/product    ext4    ro,barrier=1     wait,slotselect,avb,logical<\/code><\/pre>\n\n\n\n
\u6302\u8f7d\u6d41\u7a0b<\/h2>\n\n\n\n
rc\u914d\u7f6e\u89e3\u6790<\/h3>\n\n\n\n
\u5728Android2.1\u4e2d\uff0c\u6587\u4ef6\u7cfb\u7edf\u7684\u6302\u8f7d\u8d77\u59cb\u4e8einit.rc\u4e2d\u7684\u8bbe\u5b9a\uff0c\u8fd9\u91cc\u6211\u4eec\u4ee5\u4e00\u4e2ainit.rc\u4e3a\u4f8b\uff1a<\/p>\n\n\n\n
on fs\n    mount_all \/vendor\/etc\/fstab.${ro.boot.hardware.platform} --early\n\n    mkdir \/mnt\/vendor\/persist\/audio 0770 media audio\n    mkdir \/mnt\/vendor\/persist\/data 0700 system system\n    mkdir \/mnt\/vendor\/persist\/display 0770 system graphics\n    mkdir \/mnt\/vendor\/persist\/haptics 0770 system system\n    mkdir \/mnt\/vendor\/persist\/rfs 0770 root system\n    mkdir \/mnt\/vendor\/persist\/hlos_rfs 0770 root system\n    mkdir \/mnt\/vendor\/persist\/touch 0770 system system<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u6211\u4eec\u770b\u5230\uff0crc\u542f\u52a8\u914d\u7f6e\u4e2d\u663e\u5f0f\u5730\u4f7f\u7528\u4e86mount_all\u8fd9\u4e2acommand\uff0c\u7d27\u8ddf\u7740\u7684\u662f\u4e00\u4e2a\u4f4d\u4e8e\/vendor\/etc\u8def\u5f84\u4e0b\u4ee5fstab\u5f00\u5934\u7684\u6587\u4ef6\uff0c\u8fd9\u91cc${ro.boot.hardware.platform}\u662f\u7528\u4e8e\u66ff\u4ee3\u53d8\u91cf\u7684\u3002\u8fd9\u91cc\u7684fstab\u5f00\u5934\u7684\u6587\u4ef6\u5176\u5b9e\u4e5f\u5c31\u662f\u5b89\u5353\u7cfb\u7edf\u4e2d\u6240\u7528\u7684fstab\u914d\u7f6e\u3002<\/p>\n\n\n\n
\u6211\u4eec\u5df2\u7ecf\u77e5\u9053\uff0c\u5404\u4e2arc\u6587\u4ef6\u7684\u89e3\u6790\u662f\u7531init\u8fdb\u7a0b\u8fdb\u884c\u7684\uff0c\u5177\u4f53\u8fc7\u7a0b\u662f\u600e\u6837\u7684\u5462\uff0c\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u770b\u4e00\u4e0b\u76f8\u5173\u6e90\u7801\uff1a<\/p>\n\n\n\n
#system\/core\/init\/builtins.cpp \nconst BuiltinFunctionMap& GetBuiltinFunctionMap() {\n.....\n{\"mount_all\",               {0,     kMax, {false,  do_mount_all}}},\n{\"mount\",                   {3,     kMax, {false,  do_mount}}},\n{\"perform_apex_config\",     {0,     0,    {false,  do_perform_apex_config}}},\n{\"umount\",                  {1,     1,    {false,  do_umount}}},\n{\"umount_all\",              {0,     1,    {false,  do_umount_all}}},\n.....\n}\n<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u5176\u5b9e\u5c31\u662f\u901a\u8fc7GetBuiltinFunctionMap\u5c06rc\u914d\u7f6e\u6587\u4ef6\u4e2d\u7684mount_all\u547d\u4ee4\u5bf9\u5e94\u5230do_mount_all\u51fd\u6570\uff0c\u4ece\u800c\u5b8c\u6210rc\u914d\u7f6e\u6587\u4ef6\u7684\u89e3\u6790\uff0c\u8fdb\u5165\u5230fstab\u7684\u914d\u7f6e\u89e3\u6790\u3002<\/p>\n\n\n\n
fstab\u914d\u7f6e\u89e3\u6790<\/h3>\n\n\n\n
\u8fd9\u91cc\u6211\u4eec\u8fdb\u5165\u5230do_mount_all\u51fd\u6570\uff0c\u770b\u770b\u91cc\u9762\u5230\u5e95\u505a\u4e86\u4e9b\u4ec0\u4e48\uff1a<\/p>\n\n\n\n
\/* <= Q: mount_all <fstab> [ <path> ]* [--<options>]*\n * >= R: mount_all [ <fstab> ] [--<options>]*\n *\n * This function might request a reboot, in which case it will\n * not return.\n *\/\nstatic Result<void> do_mount_all(const BuiltinArguments& args) {\n    auto mount_all = ParseMountAll(args.args);\n    if (!mount_all.ok()) return mount_all.error();\n\n    const char* prop_post_fix = \"default\";\n    bool queue_event = true;\n    if (mount_all->mode == MOUNT_MODE_EARLY) {\n        prop_post_fix = \"early\";\n        queue_event = false;\n    } else if (mount_all->mode == MOUNT_MODE_LATE) {\n        prop_post_fix = \"late\";\n    }\n\n    std::string prop_name = \"ro.boottime.init.mount_all.\"s + prop_post_fix;\n    android::base::Timer t;\n\n    Fstab fstab;\n    if (mount_all->fstab_path.empty()) {\n        if (!ReadDefaultFstab(&fstab)) {\n            return Error() << \"Could not read default fstab\";\n        }\n    } else {\n        if (!ReadFstabFromFile(mount_all->fstab_path, &fstab)) {\n            return Error() << \"Could not read fstab\";\n        }\n    }\n\n    auto mount_fstab_result = fs_mgr_mount_all(&fstab, mount_all->mode);\n    SetProperty(prop_name, std::to_string(t.duration().count()));\n\n    if (mount_all->import_rc) {\n        import_late(mount_all->rc_paths);\n    }\n    if (mount_fstab_result.userdata_mounted) {\n        \/\/ This call to fs_mgr_mount_all mounted userdata. Keep the result in\n        \/\/ order for userspace reboot to correctly remount userdata.\n        LOG(INFO) << \"Userdata mounted using \"\n                  << (mount_all->fstab_path.empty() ? \"(default fstab)\" : mount_all->fstab_path)\n                  << \" result : \" << mount_fstab_result.code;\n        initial_mount_fstab_return_code = mount_fstab_result.code;\n    }\n\n    if (queue_event) {\n        \/* queue_fs_event will queue event based on mount_fstab return code\n         * and return processed return code*\/\n        auto queue_fs_result = queue_fs_event(mount_fstab_result.code, false);\n        if (!queue_fs_result.ok()) {\n            return Error() << \"queue_fs_event() failed: \" << queue_fs_result.error();\n        }\n    }\n\n     return {};\n}\n<\/code><\/pre>\n\n\n\n
\u5728\u8be5\u51fd\u6570\u5185\uff0c\u4f1a\u5148\u901a\u8fc7ParseMountAll\u5f97\u5230\u4e00\u4e2aT\u7c7b\u578b\u4e3aMountAllOptions\u7684\u6a21\u677f\u7c7b\u5bf9\u8c61\uff0cMountAllOptions\u4e3a\u4e00\u4e2a\u7ed3\u6784\u4f53\uff0c\u5176\u5177\u4f53\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n
struct MountAllOptions {\n    std::vector<std::string> rc_paths;\n    std::string fstab_path; \/\/fstab\u6587\u4ef6\u8def\u5f84\n    mount_mode mode;  \/\/mount\u6a21\u5f0f\n    bool import_rc;\n};<\/code><\/pre>\n\n\n\n
\u6211\u4eec\u6cbf\u7740ParseMountAll\u7684\u5177\u4f53\u5b9e\u73b0\u8ffd\u6eaf\u8c03\u7528\u94fe\uff0c\u53ef\u5f97\uff1a<\/p>\n\n\n\n
utils.cpp\/ParseMountAll->fs_mgr_fstab.cpp\/ReadDefaultFstab or ReadFstabFromFile->fs_mgr.cpp\/ fs_mgr_mount_all<\/code><\/pre>\n\n\n\n
\u5982\u679c\u6211\u4eec\u5728init.rc\u4e2d\u4f7f\u7528mount_all\u547d\u4ee4\u52a0\u8f7dfstab\u65f6\u6ca1\u6709\u6307\u5b9a\u5177\u4f53\u7684fstab\u6587\u4ef6\u8def\u5f84\uff0c\u5219\u4f1a\u4ee5\u901a\u8fc7fs_mgr_fstab.cpp\u4e2d\u7684ReadDefaultFstab\u51fd\u6570\u8bfb\u53d6\u9ed8\u8ba4\u5e94\u52a0\u8f7d\u7684fstab,\u5982\u6dfb\u52a0\u4e86fstab\u6587\u4ef6\u8def\u5f84\uff0c\u5219\u8bfb\u53d6\u8be5fstab\u6587\u4ef6\u5e76\u89e3\u6790\uff0c\u8fd9\u91cc\u7684\u5de5\u4f5c\u5c06\u5728ReadFstabFromFile\u4e2d\u5b8c\u6210\uff1a<\/p>\n\n\n\n
bool ReadFstabFromFile(const std::string& path, Fstab* fstab_out) {\n    auto fstab_file = std::unique_ptr<FILE, decltype(&fclose)>{fopen(path.c_str(), \"re\"), fclose};\n    if (!fstab_file) {\n        PERROR << __FUNCTION__ << \"(): cannot open file: '\" << path << \"'\";\n        return false;\n    }\n\n    bool is_proc_mounts = path == \"\/proc\/mounts\";\n\n    Fstab fstab;\n    if (!ReadFstabFile(fstab_file.get(), is_proc_mounts, &fstab)) {\n        LERROR << __FUNCTION__ << \"(): failed to load fstab from : '\" << path << \"'\";\n        return false;\n    }\n    ....\n}<\/code><\/pre>\n\n\n\n
\u7ee7\u7eed\u8ffd\u8e2a\u8c03\u7528\u94fe\uff0c\u6211\u4eec\u53ef\u4ee5\u5f97\u5230\u89e3\u6790fstab\u7684\u4e24\u4e2a\u5173\u952e\u51fd\u6570\uff0c\u5206\u522b\u662fParseMountFlags\u4e0eParseMgrFlags\uff1b\u6240\u6709\u7684\u89e3\u6790\u7ed3\u679c\u6700\u7ec8\u90fd\u4f1a\u5b58\u50a8\u5230\u4e00\u4e2a\u540d\u4e3aFstabEntry\u7684\u7ed3\u6784\u4f53\u5185\uff0c\u8be5\u7ed3\u6784\u4f53\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n
struct FstabEntry {\n    std::string blk_device;\n    std::string logical_partition_name;\n    std::string mount_point;\n    std::string fs_type;\nunsigned long flags = 0;\n\u2026..\n}<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u7ed3\u5408\u5177\u4f53\u7684\u4ee3\u7801\u6765\u770b\u770bfstab\u6587\u4ef6\u7684\u89e3\u6790\u8fc7\u7a0b\uff1a<\/p>\n\n\n\n
FstabEntry entry;\n\/\/line\u53c2\u6570\u901a\u8fc7getline \u83b7\u53d6,delim\u6307\u4ee3\u5177\u4f53\u7684\u5206\u9694\u7b26\uff0c\u8fd9\u91cc\u7edf\u4e00\u4f7f\u7528\u201d \\t\u201d\uff0c\u4e5f\u5c31\u662f\u7a7a\u683c\nif (!(p = strtok_r(line, delim, &save_ptr))) {\n            LERROR << \"Error parsing mount source\";\n            goto err;\n}\nentry.blk_device = p; \/\/\u83b7\u53d6\u5bf9\u5e94\u7684\u78c1\u76d8\u8bbe\u5907\nif (!(p = strtok_r(NULL, delim, &save_ptr))) {\n            LERROR << \"Error parsing mount_point\";\n            goto err;\n}\nentry.mount_point = p; \/\/\u83b7\u53d6\u6302\u8f7d\u70b9\u4fe1\u606f\nif (!(p = strtok_r(NULL, delim, &save_ptr))) {\n            LERROR << \"Error parsing fs_type\";\n            goto err;\n }\nentry.fs_type = p;\/\/ \u83b7\u53d6\u6587\u4ef6\u7c7b\u578b\n....\nParseMountFlags(p, &entry); \/\/\u89e3\u6790mount\u9009\u9879\nParseFsMgrFlags(p, &entry); \/\/\u89e3\u6790fs_mgr\u914d\u7f6e\u9009\u9879\n<\/code><\/pre>\n\n\n\n
\u6211\u4eec\u518d\u7ed3\u5408\u5177\u4f53\u7684fstab\u6587\u4ef6\u6765\u770b\u770b:<\/p>\n\n\n\n
system \/system ext4 ro,barrier=1,discard,errors=continue  wait,first_stage_mount,logical\nsystem_ext \/system_ext ext4 ro,barrier=1,discard  wait,first_stage_mount,logical\nvendor \/vendor ext4 ro,barrier=1,discard  wait,first_stage_mount,logical\nproduct \/product ext4 ro,barrier=1,discard  wait,first_stage_mount,logical\nvendor_dlkm \/vendor_dlkm ext4 ro,noatime,errors=panic  wait,first_stage_mount,logical<\/code><\/pre>\n\n\n\n
\u4ee5\u8be5fstab\u6587\u4ef6\u4e2d\u7684\u6761\u76ee1\u4e3a\u4f8b\uff1a\u8fd9\u91ccentry.blk_device\u5373\u4e3asystem\uff0c\u5373\u6307\u4ee3system\u5206\u533a\uff1bentry.mount=\/system,\u5373\u6302\u8f7d\u70b9\u4e3a\/system\u76ee\u5f55\uff0c\u4e14\u8be5\u5206\u533a\u7684\u683c\u5f0f\u4e3aext4\uff1bro,barrier=1\uff0cdiscard,errors=continue\u4e3amount\u9009\u9879\uff0c\u5269\u4e0b\u7684\u90e8\u5206\u4e3afs_mgr\u7684\u914d\u7f6e\u9009\u9879\uff1b<\/p>\n\n\n\n
\u6267\u884c\u6302\u8f7d<\/h3>\n\n\n\n
\u6211\u4eec\u56de\u5230utils.cpp\u4e2d\u7684do_mount_all\u51fd\u6570\u5185\uff0c\u5728\u89e3\u6790\u5b8cfstab\u914d\u7f6e\u4e4b\u540e\uff0c\u6211\u4eec\u8fdb\u5165\u5230fs_mgr_mount_all\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u4e3a\u6267\u884cmount\u52a8\u4f5c\u7684\u5177\u4f53\u5b9e\u73b0\u65b9\u3002<\/p>\n\n\n\n
\u76f8\u5173\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\/\/ When multiple fstab records share the same mount_point, it will try to mount each\n\/\/ one in turn, and ignore any duplicates after a first successful mount.\n\/\/ Returns -1 on error, and  FS_MGR_MNTALL_* otherwise.\nMountAllResult fs_mgr_mount_all(Fstab* fstab, int mount_mode) {\n    int encryptable = FS_MGR_MNTALL_DEV_NOT_ENCRYPTABLE;\n    int error_count = 0;\n    CheckpointManager checkpoint_manager;\n    AvbUniquePtr avb_handle(nullptr);\n    bool wiped = false;\n\n    bool userdata_mounted = false;\n    if (fstab->empty()) {\n        return {FS_MGR_MNTALL_FAIL, userdata_mounted};\n    }\n\n    \/\/ Keep i int to prevent unsigned integer overflow from (i = top_idx - 1),\n    \/\/ where top_idx is 0. It will give SIGABRT\n    for (int i = 0; i < static_cast<int>(fstab->size()); i++) {\n        auto& current_entry = (*fstab)[i];\n\n        \/\/ If a filesystem should have been mounted in the first stage, we\n        \/\/ ignore it here. With one exception, if the filesystem is\n        \/\/ formattable, then it can only be formatted in the second stage,\n        \/\/ so we allow it to mount here.\n        if (current_entry.fs_mgr_flags.first_stage_mount &&\n            (!current_entry.fs_mgr_flags.formattable ||\n             IsMountPointMounted(current_entry.mount_point))) {\n            continue;\n        }\n\n        \/\/ Don't mount entries that are managed by vold or not for the mount mode.\n        if (current_entry.fs_mgr_flags.vold_managed || current_entry.fs_mgr_flags.recovery_only ||\n            ((mount_mode == MOUNT_MODE_LATE) && !current_entry.fs_mgr_flags.late_mount) ||\n            ((mount_mode == MOUNT_MODE_EARLY) && current_entry.fs_mgr_flags.late_mount)) {\n            continue;\n        }\n        ....\n}<\/code><\/pre>\n\n\n\n
\u6d89\u53ca\u5230\u5177\u4f53mount\u65f6\u7684\u884c\u4e3a\u65f6\uff0c\u901a\u8fc7for\u5faa\u73af\u9488\u5bf9fstab\u914d\u7f6e\u6761\u76ee\u8fdb\u884c\u6302\u8f7d\uff0c\u6d89\u53ca\u5230\u91cd\u590d\u7684\u6761\u76ee\u65f6\uff0c\u82e5\u7b2c\u4e00\u6b21\u6302\u8f7d\u6210\u529f\u5219\u4e0d\u518d\u8fdb\u884c\u6302\u8f7d\uff0c\u6240\u6709\u7684\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u7ed3\u679c\u5c06\u5b58\u50a8\u81f3MountAllResult\u5185\u8fdb\u884c\u8fd4\u56de\u3002<\/p>\n\n\n\n
\u5177\u4f53\u7684\u6302\u8f7d\u884c\u4e3a\u6d89\u53ca\u5230\u6302\u8f7d\u7684\u65f6\u673a\uff0c\u6587\u4ef6\u7cfb\u7edf\u7684\u7c7b\u578b\uff0c\u6302\u8f7d\u70b9\u7684\u4e0d\u540c\uff0c\u662f\u5426\u652f\u6301AVB\uff0c\u5206\u533a\u5c5e\u6027\u4ee5\u53ca\u4e0eVold\u7cfb\u7edf\u7684\u4ea4\u4e92\u7b49\u7b49\uff0c\u9650\u4e8e\u7bc7\u5e45\u95ee\u9898\uff0c\u4e0d\u5728\u6b64\u7bc7\u6587\u7ae0\u5185\u8fdb\u884c\u6df1\u7a76\u3002<\/p>\n\n\n\n
\u76f8\u5173\u62d3\u5c55<\/h2>\n\n\n\n
\u5b89\u5353\u7684\u6587\u4ef6\u7cfb\u7edf\u662f\u4e0e\u5206\u533a\u662f\u76f8\u7ed1\u5b9a\u7684\uff0c\u6211\u4eec\u5728\u7f16\u8bd1\u5b89\u5353\u7248\u672c\u662f\u4f1a\u6d89\u53ca\u5230\u5206\u533a\u5927\u5c0f\uff0c\u5206\u533a\u7684\u683c\u5f0f\u7b49\u7b49\u8bbe\u5b9a\uff0c\u8fd9\u90e8\u5206\u8bbe\u5b9a\u6211\u4eec\u90fd\u53ef\u4ee5\u5728\u7f16\u8bd1\u65f6\u901a\u8fc7Makefile\u8fdb\u884c\u914d\u7f6e\uff1a<\/p>\n\n\n\n
\u5982\u8bbe\u5b9a\u5206\u533a\u5927\u5c0f\uff1a<\/p>\n\n\n\n
BOARD_USERDATAIMAGE_PARTITION_SIZE\uff1a\u8bbe\u7f6eusrdata\u5927\u5c0f\nBOARD_CACHEIMAGE_PARTITION_SIZE\uff1a\u8bbe\u7f6ecache.img\u5927\u5c0f\nBOARD_VENDORIMAGE_PARTITION_SIZE\uff1a\u8bbe\u7f6evendor.img\u5927\u5c0f\nBOARD_BOOTIMAGE_PARTITION_SIZE\uff1a\u8bbe\u7f6eboot.img\u5927\u5c0f\nBOARD_DTBOIMG_PARTITION_SIZE\uff1a\u8bbe\u7f6edtbo.img\u5927\u5c0f\nBOARD_SUPER_PARTITION_SIZE\uff1a\u8bbe\u7f6esuper.img\u5927\u5c0f<\/code><\/pre>\n\n\n\n
\u5982\u8bbe\u5b9a\u5206\u533a\u5bf9\u5e94\u7684\u6587\u4ef6\u7cfb\u7edf\u683c\u5f0f\uff1a<\/p>\n\n\n\n
BOARD_BOOTIMAGE_FILE_SYSTEM_TYPE := ext4\nBOARD_SUPERIMAGE_FILE_SYSTEM_TYPE := ext4<\/code><\/pre>\n\n\n\n
<\/p>\n        
\n            
\n                \n                
\n                    \n                        \"Happy\"\n                    <\/a>\n                    
\n                        Happy                    <\/div>\n                    
\n                                                    0<\/span>\n                        \n                                                0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sad\"\n                    <\/a>\n                    
\n                        Sad                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Excited\"\n                    <\/a>\n                    
\n                        Excited                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sleepy\"\n                    <\/a>\n                    
\n                        Sleepy                    <\/div>\n                    
\n                                                    0<\/span>\n                        \n                                                0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Angry\"\n                    <\/a>\n                    
Angry<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                        \n                    <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Surprise\"\n                    <\/a>\n                    
Surprise<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n            <\/div>\n        <\/div>","protected":false},"excerpt":{"rendered":"
Android12.1\u4e2d\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u6d41\u7a0b\u7684\u7b80\u8981\u5206\u6790<\/p>","protected":false},"author":1,"featured_media":4483,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":2,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[18],"tags":[46,74],"class_list":["post-5048","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-operating-system","tag-android","tag-filesystem"],"blocksy_meta":[],"aioseo_notices":[],"featured_image_urls":{"full":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"thumbnail":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-150x150.jpg",150,150,true],"medium":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-300x158.jpg",300,158,true],"medium_large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"1536x1536":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"2048x2048":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"trp-custom-language-flag":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-18x9.jpg",18,9,true]},"post_excerpt_stackable":"
Android12.1\u4e2d\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u6d41\u7a0b\u7684\u7b80\u8981\u5206\u6790<\/p>\n","category_list":"\u64cd\u4f5c\u7cfb\u7edf<\/a>","author_info":{"name":"FranzKafka95","url":"https:\/\/blog.coderfan.org\/en\/author\/yushenglonely95"},"comments_num":"0 comments","featured_image_urls_v2":{"full":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"thumbnail":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-150x150.jpg",150,150,true],"medium":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-300x158.jpg",300,158,true],"medium_large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"1536x1536":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"2048x2048":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android.jpg",512,269,false],"trp-custom-language-flag":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2023\/04\/android-18x9.jpg",18,9,true]},"post_excerpt_stackable_v2":"
Android12.1\u4e2d\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u6d41\u7a0b\u7684\u7b80\u8981\u5206\u6790<\/p>\n","category_list_v2":"\u64cd\u4f5c\u7cfb\u7edf<\/a>","author_info_v2":{"name":"FranzKafka95","url":"https:\/\/blog.coderfan.org\/en\/author\/yushenglonely95"},"comments_num_v2":"0 comments","_links":{"self":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts\/5048","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/comments?post=5048"}],"version-history":[{"count":12,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts\/5048\/revisions"}],"predecessor-version":[{"id":5064,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts\/5048\/revisions\/5064"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/media\/4483"}],"wp:attachment":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/media?parent=5048"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/categories?post=5048"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/tags?post=5048"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}