Project import
diff --git a/puncture_fs/Android.mk b/puncture_fs/Android.mk new file mode 100644 index 0000000..0b79cca --- /dev/null +++ b/puncture_fs/Android.mk
@@ -0,0 +1,31 @@ +# Copyright (C) 2014 The Android Open Source Project +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +LOCAL_PATH := $(call my-dir) + +include $(CLEAR_VARS) + +LOCAL_SRC_FILES := puncture_fs.c + +LOCAL_C_INCLUDES += system/core/logwrapper/include + +LOCAL_SHARED_LIBRARIES := libc liblog liblogwrap + +LOCAL_MODULE := puncture_fs + +LOCAL_MODULE_TAGS := debug + +LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES) + +include $(BUILD_EXECUTABLE)
diff --git a/puncture_fs/NOTICE b/puncture_fs/NOTICE new file mode 100644 index 0000000..316b4eb --- /dev/null +++ b/puncture_fs/NOTICE
@@ -0,0 +1,190 @@ + + Copyright (c) 2014, The Android Open Source Project + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. + + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. For the purposes of this definition, + "control" means (i) the power, direct or indirect, to cause the + direction or management of such entity, whether by contract or + otherwise, or (ii) ownership of fifty percent (50%) or more of the + outstanding shares, or (iii) beneficial ownership of such entity. + + "You" (or "Your") shall mean an individual or Legal Entity + exercising permissions granted by this License. + + "Source" form shall mean the preferred form for making modifications, + including but not limited to software source code, documentation + source, and configuration files. + + "Object" form shall mean any form resulting from mechanical + transformation or translation of a Source form, including but + not limited to compiled object code, generated documentation, + and conversions to other media types. + + "Work" shall mean the work of authorship, whether in Source or + Object form, made available under the License, as indicated by a + copyright notice that is included in or attached to the work + (an example is provided in the Appendix below). + + "Derivative Works" shall mean any work, whether in Source or Object + form, that is based on (or derived from) the Work and for which the + editorial revisions, annotations, elaborations, or other modifications + represent, as a whole, an original work of authorship. For the purposes + of this License, Derivative Works shall not include works that remain + separable from, or merely link (or bind by name) to the interfaces of, + the Work and Derivative Works thereof. + + "Contribution" shall mean any work of authorship, including + the original version of the Work and any modifications or additions + to that Work or Derivative Works thereof, that is intentionally + submitted to Licensor for inclusion in the Work by the copyright owner + or by an individual or Legal Entity authorized to submit on behalf of + the copyright owner. For the purposes of this definition, "submitted" + means any form of electronic, verbal, or written communication sent + to the Licensor or its representatives, including but not limited to + communication on electronic mailing lists, source code control systems, + and issue tracking systems that are managed by, or on behalf of, the + Licensor for the purpose of discussing and improving the Work, but + excluding communication that is conspicuously marked or otherwise + designated in writing by the copyright owner as "Not a Contribution." + + "Contributor" shall mean Licensor and any individual or Legal Entity + on behalf of whom a Contribution has been received by Licensor and + subsequently incorporated within the Work. + + 2. Grant of Copyright License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + copyright license to reproduce, prepare Derivative Works of, + publicly display, publicly perform, sublicense, and distribute the + Work and such Derivative Works in Source or Object form. + + 3. Grant of Patent License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + (except as stated in this section) patent license to make, have made, + use, offer to sell, sell, import, and otherwise transfer the Work, + where such license applies only to those patent claims licensable + by such Contributor that are necessarily infringed by their + Contribution(s) alone or by combination of their Contribution(s) + with the Work to which such Contribution(s) was submitted. If You + institute patent litigation against any entity (including a + cross-claim or counterclaim in a lawsuit) alleging that the Work + or a Contribution incorporated within the Work constitutes direct + or contributory patent infringement, then any patent licenses + granted to You under this License for that Work shall terminate + as of the date such litigation is filed. + + 4. Redistribution. You may reproduce and distribute copies of the + Work or Derivative Works thereof in any medium, with or without + modifications, and in Source or Object form, provided that You + meet the following conditions: + + (a) You must give any other recipients of the Work or + Derivative Works a copy of this License; and + + (b) You must cause any modified files to carry prominent notices + stating that You changed the files; and + + (c) You must retain, in the Source form of any Derivative Works + that You distribute, all copyright, patent, trademark, and + attribution notices from the Source form of the Work, + excluding those notices that do not pertain to any part of + the Derivative Works; and + + (d) If the Work includes a "NOTICE" text file as part of its + distribution, then any Derivative Works that You distribute must + include a readable copy of the attribution notices contained + within such NOTICE file, excluding those notices that do not + pertain to any part of the Derivative Works, in at least one + of the following places: within a NOTICE text file distributed + as part of the Derivative Works; within the Source form or + documentation, if provided along with the Derivative Works; or, + within a display generated by the Derivative Works, if and + wherever such third-party notices normally appear. The contents + of the NOTICE file are for informational purposes only and + do not modify the License. You may add Your own attribution + notices within Derivative Works that You distribute, alongside + or as an addendum to the NOTICE text from the Work, provided + that such additional attribution notices cannot be construed + as modifying the License. + + You may add Your own copyright statement to Your modifications and + may provide additional or different license terms and conditions + for use, reproduction, or distribution of Your modifications, or + for any such Derivative Works as a whole, provided Your use, + reproduction, and distribution of the Work otherwise complies with + the conditions stated in this License. + + 5. Submission of Contributions. Unless You explicitly state otherwise, + any Contribution intentionally submitted for inclusion in the Work + by You to the Licensor shall be under the terms and conditions of + this License, without any additional terms or conditions. + Notwithstanding the above, nothing herein shall supersede or modify + the terms of any separate license agreement you may have executed + with Licensor regarding such Contributions. + + 6. Trademarks. This License does not grant permission to use the trade + names, trademarks, service marks, or product names of the Licensor, + except as required for reasonable and customary use in describing the + origin of the Work and reproducing the content of the NOTICE file. + + 7. Disclaimer of Warranty. Unless required by applicable law or + agreed to in writing, Licensor provides the Work (and each + Contributor provides its Contributions) on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + implied, including, without limitation, any warranties or conditions + of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A + PARTICULAR PURPOSE. You are solely responsible for determining the + appropriateness of using or redistributing the Work and assume any + risks associated with Your exercise of permissions under this License. + + 8. Limitation of Liability. In no event and under no legal theory, + whether in tort (including negligence), contract, or otherwise, + unless required by applicable law (such as deliberate and grossly + negligent acts) or agreed to in writing, shall any Contributor be + liable to You for damages, including any direct, indirect, special, + incidental, or consequential damages of any character arising as a + result of this License or out of the use or inability to use the + Work (including but not limited to damages for loss of goodwill, + work stoppage, computer failure or malfunction, or any and all + other commercial damages or losses), even if such Contributor + has been advised of the possibility of such damages. + + 9. Accepting Warranty or Additional Liability. While redistributing + the Work or Derivative Works thereof, You may choose to offer, + and charge a fee for, acceptance of support, warranty, indemnity, + or other liability obligations and/or rights consistent with this + License. However, in accepting such obligations, You may act only + on Your own behalf and on Your sole responsibility, not on behalf + of any other Contributor, and only if You agree to indemnify, + defend, and hold each Contributor harmless for any liability + incurred by, or claims asserted against, such Contributor by reason + of your accepting any such warranty or additional liability. + + END OF TERMS AND CONDITIONS +
diff --git a/puncture_fs/puncture_fs.c b/puncture_fs/puncture_fs.c new file mode 100644 index 0000000..e9d08dc --- /dev/null +++ b/puncture_fs/puncture_fs.c
@@ -0,0 +1,262 @@ +/* + * Copyright (C) 2014 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <assert.h> +#include <errno.h> +#include <fcntl.h> +#include <getopt.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include <logwrap/logwrap.h> +#include <sys/stat.h> +#include <sys/statvfs.h> +#include <utils/Log.h> + +#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) + +#define MAX_IO_WRITE_CHUNK_SIZE 0x100000 + +#ifndef min +#define min(a,b) ((a) < (b) ? (a) : (b)) +#endif + +typedef unsigned long u64; + +static void usage(const char * const progname) { + fprintf(stderr, + "Usage: %s [-s <seed>] -h <hole size in bytes> -t <total hole size in bytes> " + "path\n", + progname); +} + +static u64 get_free_space(const char * const path) { + struct statvfs s; + + if (statvfs(path, &s) < 0) { + fprintf(stderr, "\nerrno: %d. Failed to get free disk space on %s\n", + errno, path); + return 0; + } else { + return (u64)s.f_bsize * (u64)s.f_bfree; + } +} + +static u64 get_random_num(const u64 start, const u64 end) { + if (end - start <= 0) + return start; + assert(RAND_MAX >= 0x7FFFFFFF); + if ((end - start) > 0x7FFFFFFF) + return start + (((u64)random() << 31) | (u64)random()) % (end - start); + return start + (random() % (end - start)); +} + +static char get_random_char() { + return 'A' + random() % ('Z' - 'A'); +} + +static bool create_unique_file(const char * const dir_path, const u64 size, + const u64 id, char * const base, + const u64 base_length) { + u64 length = 0; + int fd; + char file_path[FILENAME_MAX]; + bool ret = true; + + base[random() % min(base_length, size)] = get_random_char(); + + sprintf(file_path, "%s/file_%lu", dir_path, id); + fd = open(file_path, O_WRONLY | O_CREAT | O_SYNC, 0777); + if (fd < 0) { + // We suppress ENOSPC erros as that is common as we approach the + // last few MBs of the fs as we don't account for the size of the newly + // added meta data after the initial free space computation. + if (errno != 28) { + fprintf(stderr, "\nerrno: %d. Failed to create %s\n", errno, file_path); + } + return false; + } + while (length + base_length < size) { + if (write(fd, base, base_length) < 0) { + if (errno != 28) { + fprintf(stderr, "\nerrno: %d. Failed to write %lu bytes to %s\n", + errno, base_length, file_path); + } + ret = false; + goto done; + } + length += base_length; + } + if (write(fd, base, size - length) < 0) { + if (errno != 28) { + fprintf(stderr, "\nerrno: %d. Failed to write last %lu bytes to %s\n", + errno, size - length, file_path); + } + ret = false; + goto done; + } +done: + if (close(fd) < 0) { + fprintf(stderr, "\nFailed to close %s\n", file_path); + ret = false; + } + return ret; +} + +static bool create_unique_dir(char *dir, const char * const root_path) { + char random_string[15]; + int i; + + for (i = 0; i < 14; ++i) { + random_string[i] = get_random_char(); + } + random_string[14] = '\0'; + + sprintf(dir, "%s/%s", root_path, random_string); + + if (mkdir(dir, 0777) < 0) { + fprintf(stderr, "\nerrno: %d. Failed to create %s\n", errno, dir); + return false; + } + return true; +} + +static bool puncture_fs (const char * const path, const u64 total_size, + const u64 hole_size, const u64 total_hole_size) { + u64 increments = (hole_size * total_size) / total_hole_size; + u64 hole_max; + u64 starting_max = 0; + u64 ending_max = increments; + char stay_dir[FILENAME_MAX], delete_dir[FILENAME_MAX]; + char *rm_bin_argv[] = { "/system/bin/rm", "-rf", ""}; + u64 file_id = 1; + char *base_file_data; + u64 i = 0; + + if (!create_unique_dir(stay_dir, path) || + !create_unique_dir(delete_dir, path)) { + return false; + } + + base_file_data = (char*) malloc(MAX_IO_WRITE_CHUNK_SIZE); + for (i = 0; i < MAX_IO_WRITE_CHUNK_SIZE; ++i) { + base_file_data[i] = get_random_char(); + } + fprintf(stderr, "\n"); + while (ending_max <= total_size) { + fprintf(stderr, "\rSTAGE 1/2: %d%% Complete", + (int) (100.0 * starting_max / total_size)); + hole_max = get_random_num(starting_max, ending_max); + + create_unique_file(stay_dir, + hole_max - starting_max, + file_id++, + base_file_data, + MAX_IO_WRITE_CHUNK_SIZE); + create_unique_file(delete_dir, + hole_size, + file_id++, + base_file_data, + MAX_IO_WRITE_CHUNK_SIZE); + + starting_max = hole_max + hole_size; + ending_max += increments; + } + create_unique_file(stay_dir, + (ending_max - increments - starting_max), + file_id++, + base_file_data, + MAX_IO_WRITE_CHUNK_SIZE); + fprintf(stderr, "\rSTAGE 1/2: 100%% Complete\n"); + fprintf(stderr, "\rSTAGE 2/2: 0%% Complete"); + free(base_file_data); + rm_bin_argv[2] = delete_dir; + if (android_fork_execvp_ext(ARRAY_SIZE(rm_bin_argv), rm_bin_argv, + NULL, 1, LOG_KLOG, 0, NULL, NULL, 0) < 0) { + fprintf(stderr, "\nFailed to delete %s\n", rm_bin_argv[2]); + return false; + } + fprintf(stderr, "\rSTAGE 2/2: 100%% Complete\n"); + return true; +} + +int main (const int argc, char ** const argv) { + int opt; + int mandatory_opt; + char *path = NULL; + int seed = time(NULL); + + u64 total_size = 0; + u64 hole_size = 0; + u64 total_hole_size = 0; + + mandatory_opt = 2; + while ((opt = getopt(argc, argv, "s:h:t:")) != -1) { + switch(opt) { + case 's': + seed = atoi(optarg); + break; + case 'h': + hole_size = atoll(optarg); + mandatory_opt--; + break; + case 't': + total_hole_size = atoll(optarg); + mandatory_opt--; + break; + default: + usage(argv[0]); + exit(EXIT_FAILURE); + } + } + if (mandatory_opt) { + usage(argv[0]); + exit(EXIT_FAILURE); + } + if (optind >= argc) { + fprintf(stderr, "\nExpected path name after options.\n"); + usage(argv[0]); + exit(EXIT_FAILURE); + } + path = argv[optind++]; + + if (optind < argc) { + fprintf(stderr, "\nUnexpected argument: %s\n", argv[optind]); + usage(argv[0]); + exit(EXIT_FAILURE); + } + + srandom(seed); + fprintf(stderr, "\nRandom seed is: %d\n", seed); + + total_size = get_free_space(path); + if (!total_size) { + exit(EXIT_FAILURE); + } + if (total_size < total_hole_size || total_hole_size < hole_size) { + fprintf(stderr, "\nInvalid sizes: total available size should be " + "larger than total hole size which is larger than " + "hole size\n"); + exit(EXIT_FAILURE); + } + + if (!puncture_fs(path, total_size, hole_size, total_hole_size)) { + exit(EXIT_FAILURE); + } + return 0; +}