/* * Copyright (C) 2007 Nokia Corporation. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA * * Author: Adrian Hunter */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define PROGRAM_NAME "integck" #include "common.h" #include "libubi.h" #include "libmissing.h" /* * WARNING! This is a dirty hack! The symbols for static functions are not * printed in the stack backtrace. So we remove ths 'static' keyword using the * pre-processor. This is really error-prone because this won't work if, e.g., * local static variables were used. */ #ifdef INTEGCK_DEBUG #define static #endif #define MAX_RANDOM_SEED 10000000 /* The pattern for the top directory where we run the test */ #define TEST_DIR_PATTERN "integck_test_dir_%u" /* Maximum buffer size for a single read/write operation */ #define IO_BUFFER_SIZE 32768 /* * Check if a condition is true and die if not. */ #define stringify1(x) #x #define stringify(x) stringify1(x) #define CHECK(cond) do { \ if (!(cond)) \ check_failed(stringify(cond), __func__, __FILE__, __LINE__); \ } while(0) /* * In case of emulated power cut failures the FS has to return EROFS. But * unfortunately, the Linux kernel sometimes returns EIO to user-space anyway * (when write-back fails the return code is awayse EIO). */ #define pcv(fmt, ...) do { \ int __err = 1; \ if (args.power_cut_mode && (errno == EROFS || errno == EIO)) \ __err = 0; \ if (!args.power_cut_mode || args.verbose || __err) \ normsg(fmt " (line %d, error %d (%s))", \ ##__VA_ARGS__, __LINE__, errno, strerror(errno)); \ CHECK(!__err); \ } while(0) #define v(fmt, ...) do { \ if (args.verbose) \ normsg(fmt " (line %d)", ##__VA_ARGS__, __LINE__); \ } while(0) /* The variables below are set by command line arguments */ static struct { long repeat_cnt; int power_cut_mode; int verify_ops; int reattach; int mtdn; int verbose; const char *mount_point; } args = { .repeat_cnt = 1, }; /* * The below data structure describes the tested file-system. * * max_name_len: maximum file name length * page_size: memory page size to use with 'mmap()' * log10_initial_free: logarighm base 10 of the initial amount of free space in * the tested file-system * nospc_size_ok: file size is updated even if the write operation failed with * ENOSPC error * can_mmap: file-system supports share writable 'mmap()' operation * can_remount: is it possible to re-mount the tested file-system? * fstype: file-system type (e.g., "ubifs") * fsdev: the underlying device mounted by the tested file-system * mount_opts: non-standard mount options of the tested file-system (non-standard * options are stored in string form as a comma-separated list) * mount_flags: standard mount options of the tested file-system (standard * options as stored as a set of flags) * mount_point: tested file-system mount point path * test_dir: the directory on the tested file-system where we test */ static struct { int max_name_len; int page_size; unsigned int log10_initial_free; unsigned int nospc_size_ok:1; unsigned int can_mmap:1; unsigned int can_remount:1; char *fstype; char *fsdev; char *mount_opts; unsigned long mount_flags; char *mount_point; char *test_dir; } fsinfo = { .nospc_size_ok = 1, .can_mmap = 1, }; /* Structures to store data written to the test file system, so that we can check whether the file system is correct. */ struct write_info /* Record of random data written into a file */ { struct write_info *next; off_t offset; /* Where in the file the data was written */ union { off_t random_offset; /* Call rand_r() this number of times first */ off_t new_length; /* For truncation records new file length */ }; size_t size; /* Number of bytes written */ unsigned int random_seed; /* Seed for rand_r() to create random data. If greater than MAX_RANDOM_SEED then this is a truncation record (raw_writes only) */ }; struct dir_entry_info; struct file_info /* Each file has one of these */ { struct write_info *writes; /* Record accumulated writes to the file */ struct write_info *raw_writes; /* Record in order all writes to the file */ struct fd_info *fds; /* All open file descriptors for this file */ struct dir_entry_info *links; off_t length; int link_count; unsigned int check_run_no; /* Run number used when checking */ unsigned int no_space_error:1; /* File has incurred a ENOSPC error */ unsigned int clean:1; /* Non-zero if the file is synchronized */ }; struct symlink_info /* Each symlink has one of these */ { char *target_pathname; struct dir_entry_info *entry; /* dir entry of this symlink */ }; struct dir_info /* Each directory has one of these */ { struct dir_info *parent; /* Parent directory or null for our top directory */ unsigned int number_of_entries; struct dir_entry_info *first; struct dir_entry_info *entry; /* Dir entry of this dir */ unsigned int clean:1; /* Non-zero if the directory is synchronized */ }; struct dir_entry_info /* Each entry in a directory has one of these */ { struct dir_entry_info *next; /* List of entries in directory */ struct dir_entry_info *prev; /* List of entries in directory */ struct dir_entry_info *next_link; /* List of hard links for same file */ struct dir_entry_info *prev_link; /* List of hard links for same file */ char *name; struct dir_info *parent; /* Parent directory */ union { struct file_info *file; struct dir_info *dir; struct symlink_info *symlink; void *target; }; char type; /* f => file, d => dir, s => symlink */ char checked; /* Temporary flag used when checking */ }; struct fd_info /* We keep a number of files open */ { struct fd_info *next; struct file_info *file; int fd; }; struct open_file_info /* We keep a list of open files */ { struct open_file_info *next; struct fd_info *fdi; }; static struct dir_info *top_dir = NULL; /* Our top directory */ static struct open_file_info *open_files = NULL; /* We keep a list of open files */ static size_t open_files_count = 0; static int grow = 1; /* Should we try to grow files and directories */ static int shrink = 0; /* Should we try to shrink files and directories */ static int full = 0; /* Flag that the file system is full */ static uint64_t operation_count = 0; /* Number of operations used to fill up the file system */ static unsigned int check_run_no; static unsigned int random_seed; /* * A buffer which is used by 'make_name()' to return the generated random name. */ static char *random_name_buf; /* * This is a helper for the 'CHECK()' macro - prints a scary error message and * terminates the program. */ static void check_failed(const char *cond, const char *func, const char *file, int line) { int error = errno, count; void *addresses[128]; fflush(stdout); fflush(stderr); errmsg("condition '%s' failed in %s() at %s:%d", cond, func, file, line); normsg("error %d (%s)", error, strerror(error)); /* * Note, to make this work well you need: * 1. Make all functions non-static - add "#define static' * 2. Compile with -rdynamic and -g gcc options * 3. Preferrably compile with -O0 to avoid inlining */ count = backtrace(addresses, 128); backtrace_symbols_fd(addresses, count, fileno(stdout)); exit(EXIT_FAILURE); } /* * Is this 'struct write_info' actually holds information about a truncation? */ static int is_truncation(struct write_info *w) { return w->random_seed > MAX_RANDOM_SEED; } /* * Return a random number between 0 and max - 1. */ static unsigned int random_no(unsigned int max) { assert(max < RAND_MAX); if (max == 0) return 0; return rand_r(&random_seed) % max; } /* * Allocate a buffer of 'size' bytes and fill it with zeroes. */ static void *zalloc(size_t size) { void *buf = malloc(size); CHECK(buf != NULL); memset(buf, 0, size); return buf; } /* * Duplicate a string. */ static char *dup_string(const char *s) { char *str; assert(s != NULL); str = strdup(s); CHECK(str != NULL); return str; } static char *cat_strings(const char *a, const char *b) { char *str; size_t sz; if (a && !b) return dup_string(a); if (b && !a) return dup_string(b); if (!a && !b) return NULL; sz = strlen(a) + strlen(b) + 1; str = malloc(sz); CHECK(str != NULL); strcpy(str, a); strcat(str, b); return str; } static char *cat_paths(const char *a, const char *b) { char *str; size_t sz, na, nb; int as = 0, bs = 0; assert(a != NULL); assert(b != NULL); na = strlen(a); nb = strlen(b); if (na && a[na - 1] == '/') as = 1; if (nb && b[0] == '/') bs = 1; if ((as && !bs) || (!as && bs)) return cat_strings(a, b); if (as && bs) return cat_strings(a, b + 1); sz = na + nb + 2; str = malloc(sz); CHECK(str != NULL); strcpy(str, a); strcat(str, "/"); strcat(str, b); return str; } /* * Get the free space for the tested file system. */ static void get_fs_space(uint64_t *total, uint64_t *free) { struct statvfs st; CHECK(statvfs(fsinfo.mount_point, &st) == 0); if (total) *total = (uint64_t)st.f_blocks * (uint64_t)st.f_frsize; if (free) *free = (uint64_t)st.f_bavail * (uint64_t)st.f_frsize; } static char *dir_path(struct dir_info *parent, const char *name) { char *parent_path, *path; if (!parent) return cat_paths(fsinfo.mount_point, name); parent_path = dir_path(parent->parent, parent->entry->name); path = cat_paths(parent_path, name); free(parent_path); return path; } static void open_file_add(struct fd_info *fdi) { struct open_file_info *ofi; ofi = zalloc(sizeof(struct open_file_info)); ofi->next = open_files; ofi->fdi = fdi; open_files = ofi; open_files_count += 1; } static void open_file_remove(struct fd_info *fdi) { struct open_file_info *ofi; struct open_file_info **prev; prev = &open_files; for (ofi = open_files; ofi; ofi = ofi->next) { if (ofi->fdi == fdi) { *prev = ofi->next; free(ofi); open_files_count -= 1; return; } prev = &ofi->next; } CHECK(0); /* We are trying to remove something that is not there */ } static struct fd_info *add_fd(struct file_info *file, int fd) { struct fd_info *fdi; fdi = zalloc(sizeof(struct fd_info)); fdi->next = file->fds; fdi->file = file; fdi->fd = fd; file->fds = fdi; open_file_add(fdi); return fdi; } /* * Free all the information about writes to a file. */ static void free_writes_info(struct file_info *file) { struct write_info *w, *next; w = file->writes; while (w) { next = w->next; free(w); w = next; } w = file->raw_writes; while (w) { next = w->next; free(w); w = next; } } static void *add_dir_entry(struct dir_info *parent, char type, const char *name, void *target) { struct dir_entry_info *entry; entry = zalloc(sizeof(struct dir_entry_info)); entry->type = type; entry->name = dup_string(name); entry->parent = parent; entry->next = parent->first; if (parent->first) parent->first->prev = entry; parent->first = entry; parent->number_of_entries += 1; parent->clean = 0; if (entry->type == 'f') { struct file_info *file = target; if (!file) file = zalloc(sizeof(struct file_info)); entry->file = file; entry->next_link = file->links; if (file->links) file->links->prev_link = entry; file->links = entry; file->link_count += 1; return file; } else if (entry->type == 'd') { struct dir_info *dir = target; if (!dir) dir = zalloc(sizeof(struct dir_info)); entry->dir = dir; dir->entry = entry; dir->parent = parent; return dir; } else if (entry->type == 's') { struct symlink_info *symlink = target; if (!symlink) symlink = zalloc(sizeof(struct symlink_info)); entry->symlink = symlink; symlink->entry = entry; return symlink; } else assert(0); } static void remove_dir_entry(struct dir_entry_info *entry, int free_target) { entry->parent->clean = 0; entry->parent->number_of_entries -= 1; if (entry->parent->first == entry) entry->parent->first = entry->next; if (entry->prev) entry->prev->next = entry->next; if (entry->next) entry->next->prev = entry->prev; if (entry->type == 'f') { struct file_info *file = entry->file; if (entry->prev_link) entry->prev_link->next_link = entry->next_link; if (entry->next_link) entry->next_link->prev_link = entry->prev_link; if (file->links == entry) file->links = entry->next_link; file->link_count -= 1; if (file->link_count == 0) assert(file->links == NULL); /* Free struct file_info if file is not open and not linked */ if (free_target && !file->fds && !file->links) { free_writes_info(file); free(file); } } if (free_target) { if (entry->type == 'd') { free(entry->dir); } else if (entry->type == 's') { free(entry->symlink->target_pathname); free(entry->symlink); } } free(entry->name); free(entry); } /* * Create a new directory "name" in the parent directory described by "parent" * and add it to the in-memory list of directories. Returns zero in case of * success and -1 in case of failure. */ static int dir_new(struct dir_info *parent, const char *name) { char *path; assert(parent); path = dir_path(parent, name); v("creating dir %s", path); if (mkdir(path, 0777) != 0) { if (errno == ENOSPC) { full = 1; free(path); return 0; } pcv("cannot create directory %s", path); free(path); return -1; } if (args.verify_ops) { struct stat st; CHECK(lstat(path, &st) == 0); CHECK(S_ISDIR(st.st_mode)); } free(path); add_dir_entry(parent, 'd', name, NULL); return 0; } static int file_delete(struct file_info *file); static int file_unlink(struct dir_entry_info *entry); static int symlink_remove(struct symlink_info *symlink); static int dir_remove(struct dir_info *dir) { char *path; /* Remove directory contents */ while (dir->first) { struct dir_entry_info *entry; int ret = 0; entry = dir->first; if (entry->type == 'd') ret = dir_remove(entry->dir); else if (entry->type == 'f') ret = file_unlink(entry); else if (entry->type == 's') ret = symlink_remove(entry->symlink); else CHECK(0); /* Invalid struct dir_entry_info */ if (ret) return -1; } /* Remove directory form the file-system */ path = dir_path(dir->parent, dir->entry->name); if (rmdir(path) != 0) { pcv("cannot remove directory entry %s", path); free(path); return -1; } if (args.verify_ops) { struct stat st; CHECK(lstat(path, &st) == -1); CHECK(errno == ENOENT); } /* Remove entry from parent directory */ remove_dir_entry(dir->entry, 1); free(path); return 0; } static int file_new(struct dir_info *parent, const char *name) { char *path; mode_t mode; int fd; assert(parent != NULL); path = dir_path(parent, name); mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH; v("creating file %s", path); fd = open(path, O_CREAT | O_EXCL | O_RDWR, mode); if (fd == -1) { if (errno == ENOSPC) { full = 1; free(path); return 0; } pcv("cannot create file %s", path); free(path); return -1; } if (args.verify_ops) { struct stat st; CHECK(lstat(path, &st) == 0); CHECK(S_ISREG(st.st_mode)); } add_dir_entry(parent, 'f', name, NULL); close(fd); free(path); return 0; } static int link_new(struct dir_info *parent, const char *name, struct file_info *file) { struct dir_entry_info *entry; char *path, *target; int ret; struct stat st1, st2; entry = file->links; if (!entry) return 0; path = dir_path(parent, name); target = dir_path(entry->parent, entry->name); if (args.verify_ops) CHECK(lstat(target, &st1) == 0); v("creating hardlink %s ---> %s", path, target); ret = link(target, path); if (ret != 0) { if (errno == ENOSPC) { ret = 0; full = 1; } else pcv("cannot create hardlink %s in directory %s to file %s", path, parent->entry->name, target); free(target); free(path); return ret; } if (args.verify_ops) { CHECK(lstat(path, &st2) == 0); CHECK(S_ISREG(st2.st_mode)); CHECK(st1.st_ino == st2.st_ino); CHECK(st2.st_nlink > 1); CHECK(st2.st_nlink == st1.st_nlink + 1); } add_dir_entry(parent, 'f', name, file); free(target); free(path); return 0; } static void file_close(struct fd_info *fdi); static void file_close_all(struct file_info *file) { struct fd_info *fdi = file->fds; while (fdi) { struct fd_info *next = fdi->next; file_close(fdi); fdi = next; } } /* * Unlink a directory entry for a file. */ static int file_unlink(struct dir_entry_info *entry) { char *path; int ret; path = dir_path(entry->parent, entry->name); /* Unlink the file */ ret = unlink(path); if (ret) { pcv("cannot unlink file %s", path); free(path); return -1; } if (args.verify_ops) { struct stat st; CHECK(lstat(path, &st) == -1); CHECK(errno == ENOENT); } /* Remove file entry from parent directory */ remove_dir_entry(entry, 1); free(path); return 0; } static struct dir_entry_info *pick_entry(struct file_info *file) { struct dir_entry_info *entry; unsigned int r; if (!file->link_count) return NULL; r = random_no(file->link_count); entry = file->links; while (entry && r--) entry = entry->next_link; return entry; } static int file_unlink_file(struct file_info *file) { struct dir_entry_info *entry; entry = pick_entry(file); if (!entry) return 0; return file_unlink(entry); } /* * Close all open descriptors for a file described by 'file' and delete it by * unlinking all its hardlinks. */ static int file_delete(struct file_info *file) { struct dir_entry_info *entry = file->links; file_close_all(file); while (entry) { struct dir_entry_info *next = entry->next_link; if (file_unlink(entry)) return -1; entry = next; } return 0; } static void file_info_display(struct file_info *file) { struct dir_entry_info *entry; struct write_info *w; unsigned int wcnt; normsg("File Info:"); normsg(" Link count: %d", file->link_count); normsg(" Links:"); entry = file->links; while (entry) { normsg(" Name: %s", entry->name); normsg(" Directory: %s", entry->parent->entry->name); entry = entry->next_link; } normsg(" Length: %llu", (unsigned long long)file->length); normsg(" File was open: %s", (file->fds == NULL) ? "false" : "true"); normsg(" File was deleted: %s", (file->link_count == 0) ? "true" : "false"); normsg(" File was out of space: %s", (file->no_space_error == 0) ? "false" : "true"); normsg(" File Data:"); wcnt = 0; w = file->writes; while (w) { normsg(" Offset: %llu Size: %zu Seed: %llu R.Off: %llu", (unsigned long long)w->offset, w->size, (unsigned long long)w->random_seed, (unsigned long long)w->random_offset); wcnt += 1; w = w->next; } normsg(" %u writes", wcnt); normsg(" ============================================"); normsg(" Write Info:"); wcnt = 0; w = file->raw_writes; while (w) { if (is_truncation(w)) normsg(" Trunc from %llu to %llu", (unsigned long long)w->offset, (unsigned long long)w->new_length); else normsg(" Offset: %llu Size: %zu Seed: %llu R.Off: %llu", (unsigned long long)w->offset, w->size, (unsigned long long)w->random_seed, (unsigned long long)w->random_offset); wcnt += 1; w = w->next; } normsg(" %u writes or truncations", wcnt); normsg(" ============================================"); } static int file_open(struct file_info *file) { int fd, flags = O_RDWR; char *path; assert(file->links); path = dir_path(file->links->parent, file->links->name); if (random_no(100) == 1) flags |= O_SYNC; fd = open(path, flags); if (fd == -1) { pcv("cannot open file %s", path); free(path); return -1; } free(path); add_fd(file, fd); return 0; } static const char *get_file_name(struct file_info *file) { if (file->links) return file->links->name; return "(unlinked file, no names)"; } /* * Write random 'size' bytes of random data to offset 'offset'. Seed the random * gererator with 'seed'. Return amount of written data on success and -1 on * failure. */ static ssize_t file_write_data(struct file_info *file, int fd, off_t offset, size_t size, unsigned int seed) { size_t remains, actual, block; ssize_t written; char buf[IO_BUFFER_SIZE]; CHECK(lseek(fd, offset, SEEK_SET) != (off_t)-1); remains = size; actual = 0; written = IO_BUFFER_SIZE; v("write %zd bytes, offset %"PRIdoff_t", file %s", size, offset, get_file_name(file)); while (remains) { /* Fill up buffer with random data */ if (written < IO_BUFFER_SIZE) { memmove(buf, buf + written, IO_BUFFER_SIZE - written); written = IO_BUFFER_SIZE - written; } else written = 0; for (; written < IO_BUFFER_SIZE; ++written) buf[written] = rand_r(&seed); /* Write a block of data */ if (remains > IO_BUFFER_SIZE) block = IO_BUFFER_SIZE; else block = remains; written = write(fd, buf, block); if (written < 0) { if (errno == ENOSPC) { full = 1; file->no_space_error = 1; break; } pcv("failed to write %zu bytes to offset %llu of file %s", block, (unsigned long long)(offset + actual), get_file_name(file)); return -1; } remains -= written; actual += written; } return actual; } static void file_check_data(struct file_info *file, int fd, struct write_info *w); /* * Save the information about a file write operation and verify the write if * necessary. */ static void file_write_info(struct file_info *file, int fd, off_t offset, size_t size, unsigned int seed) { struct write_info *new_write, *w, **prev, *tmp; int inserted; off_t end, chg; /* Create struct write_info */ new_write = zalloc(sizeof(struct write_info)); new_write->offset = offset; new_write->size = size; new_write->random_seed = seed; w = zalloc(sizeof(struct write_info)); w->next = file->raw_writes; w->offset = offset; w->size = size; w->random_seed = seed; file->raw_writes = w; /* Insert it into file->writes */ inserted = 0; end = offset + size; w = file->writes; prev = &file->writes; while (w) { if (w->offset >= end) { /* w comes after new_write, so insert before it */ new_write->next = w; *prev = new_write; inserted = 1; break; } /* w does not come after new_write */ if (w->offset + w->size > offset) { /* w overlaps new_write */ if (w->offset < offset) { /* w begins before new_write begins */ if (w->offset + w->size <= end) /* w ends before new_write ends */ w->size = offset - w->offset; else { /* w ends after new_write ends */ /* Split w */ tmp = malloc(sizeof(struct write_info)); CHECK(tmp != NULL); *tmp = *w; chg = end - tmp->offset; tmp->offset += chg; tmp->random_offset += chg; tmp->size -= chg; w->size = offset - w->offset; /* Insert new struct write_info */ w->next = new_write; new_write->next = tmp; inserted = 1; break; } } else { /* w begins after new_write begins */ if (w->offset + w->size <= end) { /* w is completely overlapped, so remove it */ *prev = w->next; tmp = w; w = w->next; free(tmp); continue; } /* w ends after new_write ends */ chg = end - w->offset; w->offset += chg; w->random_offset += chg; w->size -= chg; continue; } } prev = &w->next; w = w->next; } if (!inserted) *prev = new_write; /* Update file length */ if (end > file->length) file->length = end; if (args.verify_ops && !args.power_cut_mode) file_check_data(file, fd, new_write); } /* Randomly select offset and and size to write in a file */ static void get_offset_and_size(struct file_info *file, off_t *offset, size_t *size) { unsigned int r, n; r = random_no(100); if (r == 0 && grow) /* 1 time in 100, when growing, write off the end of the file */ *offset = file->length + random_no(10000000); else if (r < 4) /* 3 (or 4) times in 100, write at the beginning of file */ *offset = 0; else if (r < 52 || !grow) /* 48 times in 100, write into the file */ *offset = random_no(file->length); else /* 48 times in 100, write at the end of the file */ *offset = file->length; /* Distribute the size logarithmically */ if (random_no(1000) == 0) r = random_no(fsinfo.log10_initial_free + 2); else r = random_no(fsinfo.log10_initial_free); n = 1; while (r--) n *= 10; *size = random_no(n); if (!grow && *offset + *size > file->length) *size = file->length - *offset; if (*size == 0) *size = 1; } static void file_check_hole(struct file_info *file, int fd, off_t offset, size_t size); static void file_truncate_info(struct file_info *file, int fd, size_t new_length) { struct write_info *w, **prev, *tmp; /* Remove / truncate file->writes */ w = file->writes; prev = &file->writes; while (w) { if (w->offset >= new_length) { /* w comes after eof, so remove it */ *prev = w->next; tmp = w; w = w->next; free(tmp); continue; } if (w->offset + w->size > new_length) w->size = new_length - w->offset; prev = &w->next; w = w->next; } /* Add an entry in raw_writes for the truncation */ w = zalloc(sizeof(struct write_info)); w->next = file->raw_writes; w->offset = file->length; w->new_length = new_length; w->random_seed = MAX_RANDOM_SEED + 1; file->raw_writes = w; if (args.verify_ops && !args.power_cut_mode && new_length > file->length) file_check_hole(file, fd, file->length, new_length - file->length); /* Update file length */ file->length = new_length; } /* * Truncate a file to length 'new_length'. If there is no enough space to * peform the operation, this function returns 1. Returns 0 on success and -1 * on failure. */ static int file_ftruncate(struct file_info *file, int fd, off_t new_length) { if (ftruncate(fd, new_length) != 0) { if (errno == ENOSPC) { file->no_space_error = 1; /* Delete errored files */ if (!fsinfo.nospc_size_ok) if (file_delete(file)) return -1; return 1; } else pcv("cannot truncate file %s to %llu", get_file_name(file), (unsigned long long)new_length); return -1; } if (args.verify_ops) CHECK(lseek(fd, 0, SEEK_END) == new_length); return 0; } /* * 'mmap()' a file and randomly select where to write data. */ static int file_mmap_write(struct file_info *file) { size_t write_cnt = 0, r, i, len, size; struct write_info *w = file->writes; void *addr; char *waddr, *path; off_t offs, offset; unsigned int seed, seed_tmp; uint64_t free_space; int fd; assert(!args.power_cut_mode); if (!file->links) return 0; get_fs_space(NULL, &free_space); if (!free_space) return 0; /* Randomly pick a written area of the file */ if (!w) return 0; while (w) { write_cnt += 1; w = w->next; } r = random_no(write_cnt); w = file->writes; for (i = 0; i < r; i++) w = w->next; offs = (w->offset / fsinfo.page_size) * fsinfo.page_size; len = w->size + (w->offset - offs); if (len > 1 << 24) len = 1 << 24; /* Open it */ assert(file->links); path = dir_path(file->links->parent, file->links->name); fd = open(path, O_RDWR); if (fd == -1) { pcv("cannot open file %s to do mmap", path); goto out_error; } /* mmap it */ addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offs); if (addr == MAP_FAILED) { pcv("cannot mmap file %s", path); goto out_error; } /* Randomly select a part of the mmapped area to write */ size = random_no(w->size); if (size > free_space) size = free_space; if (size == 0) size = 1; offset = w->offset + random_no(w->size - size); /* Write it */ seed_tmp = seed = random_no(MAX_RANDOM_SEED); waddr = addr + (offset - offs); for (i = 0; i < size; i++) waddr[i] = rand_r(&seed_tmp); /* Unmap it */ if (munmap(addr, len)) { pcv("cannot unmap file %s", path); goto out_error; } /* Record what was written */ file_write_info(file, fd, offset, size, seed); free(path); CHECK(close(fd) == 0); return 0; out_error: free(path); CHECK(close(fd) == 0); return -1; } /* * Write random amount of data to a random offset in an open file or randomly * choose to truncate it. */ static int file_write(struct file_info *file, int fd) { int ret; file->clean = 0; if (!args.power_cut_mode && fsinfo.can_mmap && !full && file->link_count && random_no(100) == 1) { /* * Do not do 'mmap()' operations if: * 1. we are in power cut testing mode, because an emulated * power cut failure may cause SIGBUS when we are writing to * the 'mmap()'ed area, and SIGBUS is not easy to ignore. * 2. When the file-system is full, because again, writing to the * 'mmap()'ed area may cause SIGBUS when the space allocation * fails. This is not enough to guarantee we never get * SIGBUS, though. For example, if we write a lot to a hole, * this might require a lot of additional space, and we may * fail here. But I do not know why we never observed this, * probably this is just very unlikely. */ ret = file_mmap_write(file); } else { int truncate = 0; off_t offset; size_t size; ssize_t actual; unsigned int seed; get_offset_and_size(file, &offset, &size); seed = random_no(MAX_RANDOM_SEED); actual = file_write_data(file, fd, offset, size, seed); if (actual < 0) return -1; if (actual != 0) file_write_info(file, fd, offset, actual, seed); if (offset + actual <= file->length && shrink) { /* * 1 time in 100, when shrinking truncate after the * write. */ if (random_no(100) == 0) truncate = 1; } if (truncate) { size_t new_length = offset + actual; ret = file_ftruncate(file, fd, new_length); if (ret == -1) return -1; if (!ret) file_truncate_info(file, fd, new_length); } /* Delete errored files */ if (!fsinfo.nospc_size_ok && file->no_space_error) return file_delete(file); } /* Sync sometimes */ if (random_no(100) >= 99) { if (random_no(100) >= 50) { v("fsyncing file %s", get_file_name(file)); ret = fsync(fd); if (ret) pcv("fsync failed for %s", get_file_name(file)); } else { v("fdatasyncing file %s", get_file_name(file)); ret = fdatasync(fd); if (ret) pcv("fdatasync failed for %s", get_file_name(file)); } if (ret) return -1; file->clean = 1; } return 0; } /* * Write random amount of data to a random offset in a file or randomly * choose to truncate it. */ static int file_write_file(struct file_info *file) { int fd, ret; char *path; assert(file->links); path = dir_path(file->links->parent, file->links->name); fd = open(path, O_RDWR); if (fd == -1) { pcv("cannot open file %s for writing", path); free(path); return -1; } ret = file_write(file, fd); CHECK(close(fd) == 0); free(path); return ret; } /* * Truncate an open file randomly. */ static int file_truncate(struct file_info *file, int fd) { int ret; size_t new_length = random_no(file->length); file->clean = 0; ret = file_ftruncate(file, fd, new_length); if (ret == -1) return -1; if (!ret) file_truncate_info(file, fd, new_length); return 0; } static int file_truncate_file(struct file_info *file) { int fd; char *path; int ret; assert(file->links); path = dir_path(file->links->parent, file->links->name); fd = open(path, O_WRONLY); if (fd == -1) { pcv("cannot open file %s to truncate", path); free(path); return -1; } free(path); ret = file_truncate(file, fd); CHECK(close(fd) == 0); return ret; } static void file_close(struct fd_info *fdi) { struct file_info *file; struct fd_info *fdp; struct fd_info **prev; /* Close file */ CHECK(close(fdi->fd) == 0); /* Remove struct fd_info */ open_file_remove(fdi); file = fdi->file; prev = &file->fds; for (fdp = file->fds; fdp; fdp = fdp->next) { if (fdp == fdi) { *prev = fdi->next; free(fdi); if (!file->link_count && !file->fds) { free_writes_info(file); free(file); } return; } prev = &fdp->next; } CHECK(0); /* Didn't find struct fd_info */ } static void file_rewrite_data(int fd, struct write_info *w, char *buf) { size_t remains, block; ssize_t written; off_t r; unsigned int seed = w->random_seed; for (r = 0; r < w->random_offset; ++r) rand_r(&seed); CHECK(lseek(fd, w->offset, SEEK_SET) != (off_t)-1); remains = w->size; written = IO_BUFFER_SIZE; while (remains) { /* Fill up buffer with random data */ if (written < IO_BUFFER_SIZE) memmove(buf, buf + written, IO_BUFFER_SIZE - written); else written = 0; for (; written < IO_BUFFER_SIZE; ++written) buf[written] = rand_r(&seed); /* Write a block of data */ if (remains > IO_BUFFER_SIZE) block = IO_BUFFER_SIZE; else block = remains; written = write(fd, buf, block); CHECK(written == block); remains -= written; } } static void save_file(int fd, struct file_info *file) { int w_fd; struct write_info *w; char buf[IO_BUFFER_SIZE]; char name[FILENAME_MAX]; const char * read_suffix = ".integ.sav.read"; const char * write_suffix = ".integ.sav.written"; size_t fname_len = strlen(get_file_name(file)); /* Open file to save contents to */ strcpy(name, "/tmp/"); if (fname_len + strlen(read_suffix) > fsinfo.max_name_len) fname_len = fsinfo.max_name_len - strlen(read_suffix); strncat(name, get_file_name(file), fname_len); strcat(name, read_suffix); normsg("Saving %sn", name); w_fd = open(name, O_CREAT | O_WRONLY, 0777); CHECK(w_fd != -1); /* Start at the beginning */ CHECK(lseek(fd, 0, SEEK_SET) != (off_t)-1); for (;;) { ssize_t r = read(fd, buf, IO_BUFFER_SIZE); CHECK(r != -1); if (!r) break; CHECK(write(w_fd, buf, r) == r); } CHECK(close(w_fd) == 0); /* Open file to save contents to */ strcpy(name, "/tmp/"); if (fname_len + strlen(write_suffix) > fsinfo.max_name_len) fname_len = fsinfo.max_name_len - strlen(write_suffix); strncat(name, get_file_name(file), fname_len); strcat(name, write_suffix); normsg("Saving %s", name); w_fd = open(name, O_CREAT | O_WRONLY, 0777); CHECK(w_fd != -1); for (w = file->writes; w; w = w->next) file_rewrite_data(w_fd, w, buf); CHECK(close(w_fd) == 0); } static void file_check_hole(struct file_info *file, int fd, off_t offset, size_t size) { size_t remains, block, i; char buf[IO_BUFFER_SIZE]; CHECK(lseek(fd, offset, SEEK_SET) != (off_t)-1); remains = size; while (remains) { if (remains > IO_BUFFER_SIZE) block = IO_BUFFER_SIZE; else block = remains; CHECK(read(fd, buf, block) == block); for (i = 0; i < block; ++i) { if (buf[i] != 0) { errmsg("file_check_hole failed at %zu checking " "hole at %llu size %zu", size - remains + i, (unsigned long long)offset, size); file_info_display(file); save_file(fd, file); } CHECK(buf[i] == 0); } remains -= block; } } static void file_check_data(struct file_info *file, int fd, struct write_info *w) { size_t remains, block, i; off_t r; unsigned char read_buf[IO_BUFFER_SIZE]; unsigned char check_buf[IO_BUFFER_SIZE]; unsigned int seed = w->random_seed; if (args.power_cut_mode && !file->clean) return; for (r = 0; r < w->random_offset; ++r) rand_r(&seed); CHECK(lseek(fd, w->offset, SEEK_SET) != (off_t)-1); remains = w->size; while (remains) { if (remains > IO_BUFFER_SIZE) block = IO_BUFFER_SIZE; else block = remains; CHECK(read(fd, read_buf, block) == block); for (i = 0; i < block; ++i) check_buf[i] = (char)rand_r(&seed); if (memcmp(check_buf, read_buf, block) != 0) { errmsg("file_check_data failed, dumping " "data at offset %llu size %zu", (unsigned long long)w->offset, w->size); fprintf (stderr, "Read data:\n"); for (r = 0; r < block; ++r) fprintf(stderr, "%02x%c", read_buf[r], ((r+1)%16)?' ':'\n'); fprintf(stderr, "\nExpected data:\n"); for (r = 0; r < block; ++r) fprintf(stderr, "%02x%c", check_buf[r], ((r+1)%16)?' ':'\n'); fprintf(stderr, " \n"); file_info_display(file); save_file(fd, file); CHECK(0); } remains -= block; } } static void file_check(struct file_info *file, int fd) { int open_and_close = 0, link_count = 0; char *path = NULL; off_t pos; struct write_info *w; struct dir_entry_info *entry; struct stat st; /* * In case of power cut emulation testing check only clean files, i.e. * the files which have not been modified since last 'fsync()'. */ if (args.power_cut_mode && !file->clean) return; /* Do not check files that have errored */ if (!fsinfo.nospc_size_ok && file->no_space_error) return; /* Do not check the same file twice */ if (file->check_run_no == check_run_no) return; file->check_run_no = check_run_no; if (fd == -1) { /* Open file */ open_and_close = 1; assert(file->links); path = dir_path(file->links->parent, get_file_name(file)); v("checking file %s", path); fd = open(path, O_RDONLY); if (fd == -1) { sys_errmsg("cannot open file %s", path); CHECK(0); } } else v("checking file %s", get_file_name(file)); /* Check length */ pos = lseek(fd, 0, SEEK_END); if (pos != file->length) { errmsg("file_check failed checking length expected %llu actual %llu\n", (unsigned long long)file->length, (unsigned long long)pos); file_info_display(file); save_file(fd, file); } CHECK(pos == file->length); /* Check each write */ pos = 0; for (w = file->writes; w; w = w->next) { if (w->offset > pos) file_check_hole(file, fd, pos, w->offset - pos); file_check_data(file, fd, w); pos = w->offset + w->size; } if (file->length > pos) file_check_hole(file, fd, pos, file->length - pos); CHECK(fstat(fd, &st) == 0); CHECK(file->link_count == st.st_nlink); if (open_and_close) { CHECK(close(fd) == 0); free(path); } entry = file->links; while (entry) { link_count += 1; entry = entry->next_link; } CHECK(link_count == file->link_count); } static char *symlink_path(const char *path, const char *target_pathname) { char *p; size_t len, totlen, tarlen; if (target_pathname[0] == '/') return dup_string(target_pathname); p = strrchr(path, '/'); len = p - path; len += 1; tarlen = strlen(target_pathname); totlen = len + tarlen + 1; p = malloc(totlen); CHECK(p != NULL); strncpy(p, path, len); p[len] = '\0'; strcat(p, target_pathname); return p; } static void symlink_check(const struct symlink_info *symlink) { char *path, buf[8192], *target; struct stat st1, st2; ssize_t len; int ret1, ret2; if (args.power_cut_mode) return; path = dir_path(symlink->entry->parent, symlink->entry->name); v("checking symlink %s", path); CHECK(lstat(path, &st1) == 0); CHECK(S_ISLNK(st1.st_mode)); CHECK(st1.st_nlink == 1); len = readlink(path, buf, 8192); CHECK(len > 0 && len < 8192); buf[len] = '\0'; CHECK(strlen(symlink->target_pathname) == len); CHECK(strncmp(symlink->target_pathname, buf, len) == 0); /* Check symlink points where it should */ ret1 = stat(path, &st1); target = symlink_path(path, symlink->target_pathname); ret2 = stat(target, &st2); CHECK(ret1 == ret2); if (ret1 == 0) { CHECK(st1.st_dev == st2.st_dev); CHECK(st1.st_ino == st2.st_ino); } free(target); free(path); } static int search_comp(const void *pa, const void *pb) { const struct dirent *a = (const struct dirent *) pa; const struct dir_entry_info *b = * (const struct dir_entry_info **) pb; return strcmp(a->d_name, b->name); } static void dir_entry_check(struct dir_entry_info **entry_array, size_t number_of_entries, struct dirent *ent) { struct dir_entry_info **found; struct dir_entry_info *entry; size_t sz; sz = sizeof(struct dir_entry_info *); found = bsearch(ent, entry_array, number_of_entries, sz, search_comp); CHECK(found != NULL); entry = *found; CHECK(!entry->checked); entry->checked = 1; } static int sort_comp(const void *pa, const void *pb) { const struct dir_entry_info *a = * (const struct dir_entry_info **) pa; const struct dir_entry_info *b = * (const struct dir_entry_info **) pb; return strcmp(a->name, b->name); } static void dir_check(struct dir_info *dir) { struct dir_entry_info *entry, **entry_array, **p; size_t sz, n; DIR *d; struct dirent *ent; unsigned int checked = 0; char *path; int link_count = 2; /* Parent and dot */ struct stat st; path = dir_path(dir->parent, dir->entry->name); if (!args.power_cut_mode || dir->clean) { v("checking dir %s", path); /* Create an array of entries */ sz = sizeof(struct dir_entry_info *); n = dir->number_of_entries; entry_array = malloc(sz * n); CHECK(entry_array != NULL); entry = dir->first; p = entry_array; while (entry) { *p++ = entry; entry->checked = 0; entry = entry->next; } /* Sort it by name */ qsort(entry_array, n, sz, sort_comp); /* Go through directory on file system checking entries match */ d = opendir(path); if (!d) { sys_errmsg("cannot open directory %s", path); CHECK(0); } for (;;) { errno = 0; ent = readdir(d); if (ent) { if (strcmp(".",ent->d_name) != 0 && strcmp("..",ent->d_name) != 0) { dir_entry_check(entry_array, n, ent); checked += 1; } } else { CHECK(errno == 0); break; } } free(entry_array); CHECK(closedir(d) == 0); CHECK(checked == dir->number_of_entries); } /* Now check each entry */ entry = dir->first; while (entry) { if (entry->type == 'd') { dir_check(entry->dir); link_count += 1; /* /.. */ } else if (entry->type == 'f') file_check(entry->file, -1); else if (entry->type == 's') symlink_check(entry->symlink); else CHECK(0); entry = entry->next; } if (!args.power_cut_mode || dir->clean) { CHECK(stat(path, &st) == 0); if (link_count != st.st_nlink) { errmsg("calculated link count %d, FS reports %d for dir %s", link_count, (int)st.st_nlink, path); CHECK(0); } } free(path); } static void check_deleted_files(void) { struct open_file_info *ofi; for (ofi = open_files; ofi; ofi = ofi->next) if (!ofi->fdi->file->link_count) file_check(ofi->fdi->file, ofi->fdi->fd); } static void close_open_files(void) { struct open_file_info *ofi; for (ofi = open_files; ofi; ofi = open_files) file_close(ofi->fdi); } static char *make_name(struct dir_info *dir) { struct dir_entry_info *entry; int found; do { found = 0; if (random_no(5) == 1) { int i, n = random_no(fsinfo.max_name_len) + 1; for (i = 0; i < n; i++) random_name_buf[i] = 'a' + random_no(26); random_name_buf[i] = '\0'; } else sprintf(random_name_buf, "%u", random_no(1000000)); for (entry = dir->first; entry; entry = entry->next) { if (strcmp(entry->name, random_name_buf) == 0) { found = 1; break; } } } while (found); return random_name_buf; } static struct file_info *pick_file(void) { struct dir_info *dir = top_dir; for (;;) { struct dir_entry_info *entry; unsigned int r; r = random_no(dir->number_of_entries); entry = dir->first; while (entry && r) { entry = entry->next; --r; } for (;;) { if (!entry) return NULL; if (entry->type == 'f') return entry->file; if (entry->type == 'd') if (entry->dir->number_of_entries != 0) break; entry = entry->next; } dir = entry->dir; } } static struct dir_info *pick_dir(void) { struct dir_info *dir = top_dir; if (random_no(40) >= 30) return dir; for (;;) { struct dir_entry_info *entry; size_t r; r = random_no(dir->number_of_entries); entry = dir->first; while (entry && r) { entry = entry->next; --r; } for (;;) { if (!entry) break; if (entry->type == 'd') break; entry = entry->next; } if (!entry) { entry = dir->first; for (;;) { if (!entry) break; if (entry->type == 'd') break; entry = entry->next; } } if (!entry) return dir; dir = entry->dir; if (random_no(40) >= 30) return dir; } } static char *pick_rename_name(struct dir_info **parent, struct dir_entry_info **rename_entry, int isdir) { struct dir_info *dir = pick_dir(); struct dir_entry_info *entry; unsigned int r; *parent = dir; *rename_entry = NULL; if (grow || random_no(20) < 10) return dup_string(make_name(dir)); r = random_no(dir->number_of_entries); entry = dir->first; while (entry && r) { entry = entry->next; --r; } if (!entry) entry = dir->first; if (!entry || (entry->type == 'd' && entry->dir->number_of_entries != 0)) return dup_string(make_name(dir)); if ((isdir && entry->type != 'd') || (!isdir && entry->type == 'd')) return dup_string(make_name(dir)); *rename_entry = entry; return dup_string(entry->name); } static int rename_entry(struct dir_entry_info *entry) { struct dir_entry_info *rename_entry = NULL; struct dir_info *parent; char *path, *to, *name; int ret, isdir, retry; struct stat st1, st2; if (!entry->parent) return 0; for (retry = 0; retry < 3; retry++) { path = dir_path(entry->parent, entry->name); isdir = entry->type == 'd' ? 1 : 0; name = pick_rename_name(&parent, &rename_entry, isdir); to = dir_path(parent, name); /* * Check we are not trying to move a directory to a subdirectory * of itself. */ if (isdir) { struct dir_info *p; for (p = parent; p; p = p->parent) if (p == entry->dir) break; if (p == entry->dir) { free(path); free(name); free(to); path = NULL; continue; } } break; } if (!path) return 0; if (args.verify_ops) CHECK(lstat(path, &st1) == 0); if (rename_entry) v("moving %s (type %c) inoto %s (type %c)", path, entry->type, to, rename_entry->type); else v("renaming %s (type %c) to %s", path, entry->type, to); ret = rename(path, to); if (ret != 0) { ret = 0; if (errno == ENOSPC) full = 1; else if (errno != EBUSY) { pcv("failed to rename %s to %s", path, to); ret = -1; } free(path); free(name); free(to); return ret; } if (args.verify_ops) { CHECK(lstat(to, &st2) == 0); CHECK(st1.st_ino == st2.st_ino); } free(path); free(to); if (rename_entry && rename_entry->type == entry->type && rename_entry->target == entry->target) { free(name); return 0; } add_dir_entry(parent, entry->type, name, entry->target); if (rename_entry) remove_dir_entry(rename_entry, 1); remove_dir_entry(entry, 0); free(name); return 0; } static size_t str_count(const char *s, char c) { size_t count = 0; char cc; while ((cc = *s++) != '\0') if (cc == c) count += 1; return count; } static char *relative_path(const char *path1, const char *path2) { const char *p1, *p2; char *rel; size_t up, len, len2, i; p1 = path1; p2 = path2; while (*p1 == *p2 && *p1) { p1 += 1; p2 += 1; } len2 = strlen(p2); up = str_count(p1, '/'); if (up == 0 && len2 != 0) return dup_string(p2); if (up == 0 && len2 == 0) { p2 = strrchr(path2, '/'); return dup_string(p2); } if (up == 1 && len2 == 0) return dup_string("."); if (len2 == 0) up -= 1; len = up * 3 + len2 + 1; rel = malloc(len); CHECK(rel != NULL); rel[0] = '\0'; if (up) { strcat(rel, ".."); for (i = 1; i < up; i++) strcat(rel, "/.."); if (len2) strcat(rel, "/"); } if (len2) strcat(rel, p2); return rel; } static char *pick_symlink_target(const char *symlink_path) { struct dir_info *dir; struct dir_entry_info *entry; char *path, *rel_path; unsigned int r; dir = pick_dir(); if (random_no(100) < 10) return dir_path(dir, make_name(dir)); r = random_no(dir->number_of_entries); entry = dir->first; while (entry && r) { entry = entry->next; --r; } if (!entry) entry = dir->first; if (!entry) return dir_path(dir, make_name(dir)); path = dir_path(dir, entry->name); if (random_no(20) < 10) return path; rel_path = relative_path(symlink_path, path); free(path); return rel_path; } static void verify_symlink(const char *target, const char *path) { int bytes; char buf[PATH_MAX + 1]; bytes = readlink(path, buf, PATH_MAX); CHECK(bytes >= 0); CHECK(bytes < PATH_MAX); buf[bytes] = '\0'; CHECK(!strcmp(buf, target)); } static int symlink_new(struct dir_info *dir, const char *nm) { struct symlink_info *s; char *path, *target, *name = dup_string(nm); /* * Note, we need to duplicate the input 'name' string because of the * shared random_name_buf. */ path = dir_path(dir, name); target = pick_symlink_target(path); v("creating symlink %s ---> %s", path, target); if (symlink(target, path) != 0) { int ret = 0; if (errno == ENOSPC) full = 1; else if (errno != ENAMETOOLONG) { pcv("cannot create symlink %s in directory %s to file %s", path, dir->entry->name, target); ret = -1; } free(target); free(name); free(path); return ret; } if (args.verify_ops) verify_symlink(target, path); s = add_dir_entry(dir, 's', name, NULL); s->target_pathname = target; free(path); free(name); return 0; } static int symlink_remove(struct symlink_info *symlink) { char *path; path = dir_path(symlink->entry->parent, symlink->entry->name); if (unlink(path) != 0) { pcv("cannot unlink symlink %s", path); free(path); return -1; } if (args.verify_ops) { struct stat st; CHECK(lstat(path, &st) == -1); CHECK(errno == ENOENT); } remove_dir_entry(symlink->entry, 1); free(path); return 0; } static int operate_on_dir(struct dir_info *dir); /* Randomly select something to do with a file */ static int operate_on_file(struct file_info *file) { /* Try to keep at least 10 files open */ if (open_files_count < 10) return file_open(file); /* Try to keep about 20 files open */ if (open_files_count < 20 && random_no(2) == 0) return file_open(file); /* Try to keep up to 40 files open */ if (open_files_count < 40 && random_no(20) == 0) return file_open(file); /* Occasionly truncate */ if (shrink && random_no(100) == 0) return file_truncate_file(file); /* Mostly just write */ if (file_write_file(file) != 0) return -1; /* Once in a while check it too */ if (random_no(100) == 1) { int fd = -2; if (file->links) fd = -1; else if (file->fds) fd = file->fds->fd; if (fd != -2) { check_run_no += 1; file_check(file, fd); } } return 0; } /* * The operate on entry function is recursive because it calls * 'operate_on_dir()' which calls 'operate_on_entry()' again. This variable is * used to limit the recursion depth. */ static int recursion_depth; /* Randomly select something to do with a directory entry */ static int operate_on_entry(struct dir_entry_info *entry) { int ret = 0; recursion_depth += 1; /* 1 time in 1000 rename */ if (random_no(1000) == 0) ret = rename_entry(entry); else if (entry->type == 's') { symlink_check(entry->symlink); /* If shrinking, 1 time in 50, remove a symlink */ if (shrink && random_no(50) == 0) ret = symlink_remove(entry->symlink); } else if (entry->type == 'd') { /* If shrinking, 1 time in 50, remove a directory */ if (shrink && random_no(50) == 0) ret = dir_remove(entry->dir); else if (recursion_depth < 20) ret = operate_on_dir(entry->dir); } else if (entry->type == 'f') { /* If shrinking, 1 time in 10, remove a file */ if (shrink && random_no(10) == 0) ret = file_delete(entry->file); /* If not growing, 1 time in 10, unlink a file with links > 1 */ else if (!grow && entry->file->link_count > 1 && random_no(10) == 0) ret = file_unlink_file(entry->file); else ret = operate_on_file(entry->file); } recursion_depth -= 1; return ret; } /* Synchronize a directory */ static int sync_directory(const char *path) { int fd, ret; fd = open(path, O_RDONLY); if (fd == -1) { pcv("cannot open directory %s", path); return -1; } if (random_no(100) >= 50) { v("fsyncing dir %s", path); ret = fsync(fd); if (ret) pcv("directory fsync failed for %s", path); } else { v("fdatasyncing dir %s", path); ret = fdatasync(fd); if (ret) pcv("directory fdatasync failed for %s", path); } close(fd); return ret; } /* * Randomly select something to do with a directory. */ static int operate_on_dir(struct dir_info *dir) { struct dir_entry_info *entry; struct file_info *file; unsigned int r; int ret = 0; r = random_no(14); if (r == 0 && grow) /* When growing, 1 time in 14 create a file */ ret = file_new(dir, make_name(dir)); else if (r == 1 && grow) /* When growing, 1 time in 14 create a directory */ ret = dir_new(dir, make_name(dir)); else if (r == 2 && grow && (file = pick_file()) != NULL) /* When growing, 1 time in 14 create a hard link */ ret = link_new(dir, make_name(dir), file); else if (r == 3 && grow && random_no(5) == 0) /* When growing, 1 time in 70 create a symbolic link */ ret = symlink_new(dir, make_name(dir)); else { /* Otherwise randomly select an entry to operate on */ r = random_no(dir->number_of_entries); entry = dir->first; while (entry && r) { entry = entry->next; --r; } if (entry) ret = operate_on_entry(entry); } if (ret) return ret; /* Synchronize the directory sometimes */ if (random_no(100) >= 99) { char *path; path = dir_path(dir->parent, dir->entry->name); ret = sync_directory(path); free(path); if (!ret) dir->clean = 1; } return ret; } /* * Randomly select something to do with an open file. */ static int operate_on_open_file(struct fd_info *fdi) { int ret = 0; unsigned int r = random_no(1000); if (shrink && r < 5) ret = file_truncate(fdi->file, fdi->fd); else if (r < 21) file_close(fdi); else if (shrink && r < 121 && fdi->file->link_count) ret = file_delete(fdi->file); else ret = file_write(fdi->file, fdi->fd); return ret; } /* * Randomly select an open file and do a random operation on it. */ static int operate_on_an_open_file(void) { unsigned int r; struct open_file_info *ofi; /* When shrinking, close all open files 1 time in 128 */ if (shrink) { static int x = 0; x += 1; x &= 127; if (x == 0) { close_open_files(); return 0; } } /* Close any open files that have errored */ if (!fsinfo.nospc_size_ok) { ofi = open_files; while (ofi) { if (ofi->fdi->file->no_space_error) { struct fd_info *fdi; fdi = ofi->fdi; ofi = ofi->next; file_close(fdi); } else ofi = ofi->next; } } r = random_no(open_files_count); for (ofi = open_files; ofi; ofi = ofi->next, r--) if (!r) { return operate_on_open_file(ofi->fdi); } return 0; } /* * Do a random file-system operation. */ static int do_an_operation(void) { /* Half the time operate on already open files */ if (random_no(100) < 50) return operate_on_dir(top_dir); else return operate_on_an_open_file(); } /* * Fill the tested file-system with random stuff. */ static int create_test_data(void) { uint64_t i, n; grow = 1; shrink = 0; full = 0; operation_count = 0; while (!full) { if (do_an_operation()) return -1; operation_count += 1; } /* Drop to less than 90% full */ grow = 0; shrink = 1; n = operation_count / 40; while (n--) { uint64_t free, total; for (i = 0; i < 10; i++) if (do_an_operation()) return -1; get_fs_space(&total, &free); if ((free * 100) / total >= 10) break; } grow = 0; shrink = 0; full = 0; n = operation_count * 2; for (i = 0; i < n; i++) if (do_an_operation()) return -1; return 0; } /* * Do more random operation on the tested file-system. */ static int update_test_data(void) { uint64_t i, n; grow = 1; shrink = 0; full = 0; while (!full) if (do_an_operation()) return -1; /* Drop to less than 50% full */ grow = 0; shrink = 1; n = operation_count / 10; while (n--) { uint64_t free, total; for (i = 0; i < 10; i++) if (do_an_operation()) return -1; get_fs_space(&total, &free); if ((free * 100) / total >= 50) break; } grow = 0; shrink = 0; full = 0; n = operation_count * 2; for (i = 0; i < n; i++) if (do_an_operation()) return -1; return 0; } /* * Recursively remove a directory, just like "rm -rf" shell command. */ static int rm_minus_rf_dir(const char *dir_name) { int ret; DIR *dir; struct dirent *dent; char buf[PATH_MAX]; v("removing all files"); dir = opendir(dir_name); CHECK(dir != NULL); CHECK(getcwd(buf, PATH_MAX) != NULL); CHECK(chdir(dir_name) == 0); for (;;) { errno = 0; dent = readdir(dir); if (!dent) { CHECK(errno == 0); break; } if (strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..")) { if (dent->d_type == DT_DIR) { ret = rm_minus_rf_dir(dent->d_name); if (ret) { CHECK(closedir(dir) == 0); return -1; } } else { ret = unlink(dent->d_name); if (ret) { pcv("cannot unlink %s", dent->d_name); CHECK(closedir(dir) == 0); return -1; } } } } CHECK(chdir(buf) == 0); CHECK(closedir(dir) == 0); if (args.verify_ops) { dir = opendir(dir_name); CHECK(dir != NULL); do { errno = 0; dent = readdir(dir); if (dent) CHECK(!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, "..")); } while (dent); CHECK(errno == 0); CHECK(closedir(dir) == 0); } ret = rmdir(dir_name); if (ret) { pcv("cannot remove directory %s", dir_name); return -1; } if (args.verify_ops) { struct stat st; CHECK(lstat(dir_name, &st) == -1); CHECK(errno == ENOENT); } return 0; } /** * Re-mount the test file-system. This function randomly select how to * re-mount. */ static int remount_tested_fs(void) { int ret; unsigned long flags; unsigned int rorw1, um, um_ro, um_rorw, rorw2; CHECK(chdir("/") == 0); v("remounting file-system"); /* Choose what to do */ rorw1 = random_no(2); um = random_no(2); um_ro = random_no(2); um_rorw = random_no(2); rorw2 = random_no(2); if (rorw1 + um + rorw2 == 0) um = 1; if (rorw1) { flags = fsinfo.mount_flags | MS_RDONLY | MS_REMOUNT; ret = mount(fsinfo.fsdev, fsinfo.mount_point, fsinfo.fstype, flags, fsinfo.mount_opts); if (ret) { pcv("cannot remount %s R/O (1)", fsinfo.mount_point); return -1; } flags = fsinfo.mount_flags | MS_REMOUNT; flags &= ~((unsigned long)MS_RDONLY); ret = mount(fsinfo.fsdev, fsinfo.mount_point, fsinfo.fstype, flags, fsinfo.mount_opts); if (ret) { pcv("remounted %s R/O (1), but cannot re-mount it R/W", fsinfo.mount_point); return -1; } } if (um) { if (um_ro) { flags = fsinfo.mount_flags | MS_RDONLY | MS_REMOUNT; ret = mount(fsinfo.fsdev, fsinfo.mount_point, fsinfo.fstype, flags, fsinfo.mount_opts); if (ret) { pcv("cannot remount %s R/O (2)", fsinfo.mount_point); return -1; } } ret = umount(fsinfo.mount_point); if (ret) { pcv("cannot unmount %s", fsinfo.mount_point); return -1; } if (!um_rorw) { ret = mount(fsinfo.fsdev, fsinfo.mount_point, fsinfo.fstype, fsinfo.mount_flags, fsinfo.mount_opts); if (ret) { pcv("unmounted %s, but cannot mount it back R/W", fsinfo.mount_point); return -1; } } else { ret = mount(fsinfo.fsdev, fsinfo.mount_point, fsinfo.fstype, fsinfo.mount_flags | MS_RDONLY, fsinfo.mount_opts); if (ret) { pcv("unmounted %s, but cannot mount it back R/O", fsinfo.mount_point); return -1; } flags = fsinfo.mount_flags | MS_REMOUNT; flags &= ~((unsigned long)MS_RDONLY); ret = mount(fsinfo.fsdev, fsinfo.mount_point, fsinfo.fstype, flags, fsinfo.mount_opts); if (ret) { pcv("unmounted %s, mounted R/O, but cannot re-mount it R/W", fsinfo.mount_point); return -1; } } } if (rorw2) { flags = fsinfo.mount_flags | MS_RDONLY | MS_REMOUNT; ret = mount(fsinfo.fsdev, fsinfo.mount_point, fsinfo.fstype, flags, fsinfo.mount_opts); if (ret) { pcv("cannot re-mount %s R/O (3)", fsinfo.mount_point); return -1; } flags = fsinfo.mount_flags | MS_REMOUNT; flags &= ~((unsigned long)MS_RDONLY); ret = mount(fsinfo.fsdev, fsinfo.mount_point, fsinfo.fstype, flags, fsinfo.mount_opts); if (ret) { pcv("remounted %s R/O (3), but cannot re-mount it back R/W", fsinfo.mount_point); return -1; } } CHECK(chdir(fsinfo.mount_point) == 0); return 0; } static void check_tested_fs(void) { v("checking the file-sytem"); check_run_no += 1; dir_check(top_dir); check_deleted_files(); } /* * This is a helper function which just reads whole file. We do this in case of * emulated power cuts testing to make sure that unclean files can be at least * read. */ static void read_whole_file(const char *name) { size_t rd; char buf[IO_BUFFER_SIZE]; int fd; fd = open(name, O_RDONLY); CHECK(fd != -1); do { rd = read(fd, buf, IO_BUFFER_SIZE); CHECK(rd != -1); } while (rd); close(fd); } /* * Recursively walk whole tested file-system and make sure we can read * everything. This is done in case of power cuts emulation testing to ensure * that everything in the file-system is readable. */ static void read_all(const char *dir_name) { DIR *dir; struct dirent *dent; char buf[PATH_MAX]; assert(args.power_cut_mode); v("reading all files"); dir = opendir(dir_name); if (!dir) { errmsg("cannot open %s", dir_name); CHECK(0); } CHECK(getcwd(buf, PATH_MAX) != NULL); CHECK(chdir(dir_name) == 0); for (;;) { errno = 0; dent = readdir(dir); if (!dent) { CHECK(errno == 0); break; } if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, "..")) continue; if (dent->d_type == DT_DIR) read_all(dent->d_name); else if (dent->d_type == DT_REG) read_whole_file(dent->d_name); else if (dent->d_type == DT_LNK) { char b[IO_BUFFER_SIZE]; CHECK(readlink(dent->d_name, b, IO_BUFFER_SIZE) != -1); } } CHECK(chdir(buf) == 0); CHECK(closedir(dir) == 0); } /* * Perform the test. Returns zero on success and -1 on failure. */ static int integck(void) { int ret; long rpt; CHECK(chdir(fsinfo.mount_point) == 0); assert(!top_dir); /* Create our top directory */ if (chdir(fsinfo.test_dir) == 0) { CHECK(chdir("..") == 0); ret = rm_minus_rf_dir(fsinfo.test_dir); if (ret) return -1; } v("creating top dir %s", fsinfo.test_dir); ret = mkdir(fsinfo.test_dir, 0777); if (ret) { pcv("cannot create top test directory %s", fsinfo.test_dir); return -1; } ret = sync_directory(fsinfo.test_dir); if (ret) return -1; top_dir = zalloc(sizeof(struct dir_info)); top_dir->entry = zalloc(sizeof(struct dir_entry_info)); top_dir->entry->name = dup_string(fsinfo.test_dir); ret = create_test_data(); if (ret) return -1; if (fsinfo.can_remount) { close_open_files(); ret = remount_tested_fs(); if (ret) return -1; } else assert(!args.power_cut_mode); /* Check everything */ check_tested_fs(); for (rpt = 0; args.repeat_cnt == 0 || rpt < args.repeat_cnt; ++rpt) { ret = update_test_data(); if (ret) return -1; if (fsinfo.can_remount) { close_open_files(); ret = remount_tested_fs(); if (ret) return -1; } /* Check everything */ check_tested_fs(); } /* Tidy up by removing everything */ close_open_files(); ret = rm_minus_rf_dir(fsinfo.test_dir); if (ret) return -1; return 0; } /* * This is a helper function for 'get_tested_fs_info()'. It parses file-system * mount options string, extracts standard mount options from there, and saves * them in the 'fsinfo.mount_flags' variable, and non-standard mount options * are saved in the 'fsinfo.mount_opts' variable. The reason for this is that * we want to preserve mount options when unmounting the file-system and * mounting it again. This is because we cannot pass standard mount optins * (like sync, ro, etc) as a string to the 'mount()' function, because it * fails. It accepts standard mount options only as flags. And only the * FS-specific mount options are accepted in form of a string. */ static void parse_mount_options(const char *mount_opts) { char *tmp, *opts, *p; const char *opt; /* * We are going to use 'strtok()' which modifies the original string, * so duplicate it. */ tmp = dup_string(mount_opts); p = opts = zalloc(strlen(mount_opts) + 1); opt = strtok(tmp, ","); while (opt) { if (!strcmp(opt, "rw")) ; else if (!strcmp(opt, "ro")) fsinfo.mount_flags |= MS_RDONLY; else if (!strcmp(opt, "dirsync")) fsinfo.mount_flags |= MS_DIRSYNC; else if (!strcmp(opt, "noatime")) fsinfo.mount_flags |= MS_NOATIME; else if (!strcmp(opt, "nodiratime")) fsinfo.mount_flags |= MS_NODIRATIME; else if (!strcmp(opt, "noexec")) fsinfo.mount_flags |= MS_NOEXEC; else if (!strcmp(opt, "nosuid")) fsinfo.mount_flags |= MS_NOSUID; else if (!strcmp(opt, "relatime")) fsinfo.mount_flags |= MS_RELATIME; else if (!strcmp(opt, "sync")) fsinfo.mount_flags |= MS_SYNCHRONOUS; else { int len = strlen(opt); if (p != opts) *p++ = ','; memcpy(p, opt, len); p += len; *p = '\0'; } opt = strtok(NULL, ","); } free(tmp); fsinfo.mount_opts = opts; } /* * This is a helper function which searches for the tested file-system mount * description. */ static struct mntent *get_tested_fs_mntent(void) { const char *mp; struct mntent *mntent; FILE *f; mp = "/proc/mounts"; f = fopen(mp, "rb"); if (!f) { mp = "/etc/mtab"; f = fopen(mp, "rb"); } CHECK(f != NULL); while ((mntent = getmntent(f)) != NULL) if (!strcmp(mntent->mnt_dir, fsinfo.mount_point)) break; CHECK(fclose(f) == 0); return mntent; } /* * Fill 'fsinfo' with information about the tested file-system. */ static void get_tested_fs_info(void) { struct statfs fs_info; struct mntent *mntent; uint64_t z; char *p; unsigned int pid; /* Remove trailing '/' symbols from the mount point */ p = dup_string(args.mount_point); fsinfo.mount_point = p; p += strlen(p); while (*--p == '/'); *(p + 1) = '\0'; CHECK(statfs(fsinfo.mount_point, &fs_info) == 0); fsinfo.max_name_len = fs_info.f_namelen; mntent = get_tested_fs_mntent(); if (!mntent) { errmsg("cannot find file-system info"); CHECK(0); } fsinfo.fstype = dup_string(mntent->mnt_type); fsinfo.fsdev = dup_string(mntent->mnt_fsname); parse_mount_options(mntent->mnt_opts); /* Get memory page size for 'mmap()' */ fsinfo.page_size = sysconf(_SC_PAGE_SIZE); CHECK(fsinfo.page_size > 0); /* * JFFS2 does not support shared writable mmap and it may report * incorrect file size after "no space" errors. */ if (strcmp(fsinfo.fstype, "jffs2") == 0) { fsinfo.nospc_size_ok = 0; fsinfo.can_mmap = 0; } get_fs_space(NULL, &z); for (; z >= 10; z /= 10) fsinfo.log10_initial_free += 1; /* Pick the test directory name */ p = malloc(sizeof(TEST_DIR_PATTERN) + 20); CHECK(p != NULL); pid = getpid(); CHECK(sprintf(p, "integck_test_dir_%u", pid) > 0); fsinfo.test_dir = p; normsg("pid %u, testing \"%s\" at \"%s\"", pid, fsinfo.fstype, fsinfo.mount_point); } static const char doc[] = PROGRAM_NAME " version " VERSION " - a stress test which checks the file-system integrity.\n" "\n" "The test creates a directory named \"integck_test_dir_\", where where\n" " is the process id. Then it randomly creates and deletes files,\n" "directories, symlinks, and hardlinks, randomly writes and truncate files,\n" "sometimes makes holes in files, sometimes fsync()'s them. Then it un-mounts and\n" "re-mounts the tested file-system and checks the contents - everything (files,\n" "directories, etc) should be there and the contents of the files should be\n" "correct. This is repeated a number of times (set with -n, default 1).\n" "\n" "By default the test does not verify file-system modifications and assumes they\n" "are done correctly if the file-system returns success. However, the -e flag\n" "enables additional verifications and the test verifies all the file-system\n" "operations it performs.\n" "\n" "This test is also able to perform power cut testing. The underlying file-system\n" "or the device driver should be able to emulate power-cuts, by switching to R/O\n" "mode at random moments. And the file-system should return EROFS (read-only\n" "file-system error) for all operations which modify it. In this case this test\n" "program re-mounts the file-system and checks that all files and directories\n" "which have been successfully synchronized before the power cut. And the test\n" "continues forever.\n"; static const char optionsstr[] = "-n, --repeat= repeat count, default is 1; zero value - repeat forever\n" "-p, --power-cut power cut testing mode (-n parameter is ignored and the\n" " test continues forever)\n" "-e, --verify-ops verify all operations, e.g., every time a file is written\n" " to, read the data back and verify it, every time a\n" " directory is created, check that it exists, etc\n" "-v, --verbose be verbose\n" "-m, --reattach= re-attach mtd device number (only if doing UBIFS power\n" " cut emulation testing)\n" "-h, -?, --help print help message\n" "-V, --version print program version\n"; static const struct option long_options[] = { { .name = "repeat", .has_arg = 1, .flag = NULL, .val = 'n' }, { .name = "power-cut", .has_arg = 0, .flag = NULL, .val = 'p' }, { .name = "verify-ops", .has_arg = 0, .flag = NULL, .val = 'e' }, { .name = "reattach", .has_arg = 1, .flag = NULL, .val = 'm' }, { .name = "verbose", .has_arg = 0, .flag = NULL, .val = 'v' }, { .name = "help", .has_arg = 0, .flag = NULL, .val = 'h' }, { .name = "version", .has_arg = 0, .flag = NULL, .val = 'V' }, { NULL, 0, NULL, 0}, }; /* * Parse and validate input command-line options. Returns zero on success and * -1 on error. */ static int parse_opts(int argc, char * const argv[]) { struct stat st; while (1) { int key, error = 0; key = getopt_long(argc, argv, "n:pm:evVh?", long_options, NULL); if (key == -1) break; switch (key) { case 'n': args.repeat_cnt = simple_strtoul(optarg, &error); if (error || args.repeat_cnt < 0) return errmsg("bad repeat count: \"%s\"", optarg); break; case 'p': args.power_cut_mode = 1; break; case 'm': args.mtdn = simple_strtoul(optarg, &error); if (error || args.mtdn < 0) return errmsg("bad mtd device number: \"%s\"", optarg); args.reattach = 1; break; case 'e': args.verify_ops = 1; break; case 'v': args.verbose = 1; break; case 'V': common_print_version(); exit(EXIT_SUCCESS); case 'h': fprintf(stderr, "%s\n\n", doc); fprintf(stderr, "%s\n", optionsstr); exit(EXIT_SUCCESS); case '?': fprintf(stderr, "%s\n\n", doc); fprintf(stderr, "%s\n", optionsstr); exit(-1); case ':': return errmsg("parameter is missing"); default: fprintf(stderr, "Use -h for help\n"); return -1; } } if (optind == argc) return errmsg("test file-system was not specified (use -h for help)"); else if (optind != argc - 1) return errmsg("more then one test file-system specified (use -h for help)"); if (args.reattach && !args.power_cut_mode) return errmsg("-m makes sense only together with -e"); if (args.power_cut_mode) /* Repeat forever if we are in power cut testing mode */ args.repeat_cnt = 0; args.mount_point = argv[optind]; if (chdir(args.mount_point) != 0 || lstat(args.mount_point, &st) != 0) return errmsg("invalid test file system mount directory: %s", args.mount_point); return 0; } /* * Free all the in-memory information about the tested file-system contents * starting from sub-directory 'dir'. */ static void free_fs_info(struct dir_info *dir) { struct dir_entry_info *entry; /* Now check each entry */ while (dir->first) { entry = dir->first; if (entry->type == 'd') { struct dir_info *d = entry->dir; remove_dir_entry(entry, 0); free_fs_info(d); free(d); } else if (entry->type == 'f') { remove_dir_entry(entry, 1); } else if (entry->type == 's') { remove_dir_entry(entry, 1); } else assert(0); } } /* * Detach the MTD device from UBI and attach it back. This function is used * whed performing emulated power cut testing andthe power cuts are amulated by * UBI, not by UBIFS. In this case, to recover from the emulated power cut we * have to unmount UBIFS and re-attach the MTD device. */ static int reattach(void) { int err = 0; libubi_t libubi; struct ubi_attach_request req; libubi = libubi_open(); if (!libubi) { if (errno == 0) return errmsg("UBI is not present in the system"); return sys_errmsg("cannot open libubi"); } err = ubi_detach_mtd(libubi, "/dev/ubi_ctrl", args.mtdn); if (err) { sys_errmsg("cannot detach mtd%d", args.mtdn); goto out; } req.dev_num = UBI_DEV_NUM_AUTO; req.mtd_num = args.mtdn; req.vid_hdr_offset = 0; req.mtd_dev_node = NULL; req.max_beb_per1024 = 0; err = ubi_attach(libubi, "/dev/ubi_ctrl", &req); if (err) sys_errmsg("cannot attach mtd%d", args.mtdn); out: libubi_close(libubi); return err; } /* * Recover the tested file-system from an emulated power cut failure by * unmounting it and mounting it again. */ static int recover_tested_fs(void) { int ret; unsigned long flags; unsigned int um_rorw, rorw2; struct mntent *mntent; CHECK(chdir("/") == 0); /* Choose what to do */ um_rorw = random_no(2); rorw2 = random_no(2); /* * At this point we do not know for sure whether the tested FS is * mounted, because the emulated power cut error could have happened * while mounting in 'remount_tested_fs()'. */ mntent = get_tested_fs_mntent(); if (mntent) CHECK(umount(fsinfo.mount_point) != -1); if (args.reattach) CHECK(reattach() == 0); if (!um_rorw) { ret = mount(fsinfo.fsdev, fsinfo.mount_point, fsinfo.fstype, fsinfo.mount_flags, fsinfo.mount_opts); if (ret) { pcv("unmounted %s, but cannot mount it back R/W", fsinfo.mount_point); return -1; } } else { ret = mount(fsinfo.fsdev, fsinfo.mount_point, fsinfo.fstype, fsinfo.mount_flags | MS_RDONLY, fsinfo.mount_opts); if (ret) { pcv("unmounted %s, but cannot mount it back R/O", fsinfo.mount_point); return -1; } flags = fsinfo.mount_flags | MS_REMOUNT; flags &= ~((unsigned long)MS_RDONLY); ret = mount(fsinfo.fsdev, fsinfo.mount_point, fsinfo.fstype, flags, fsinfo.mount_opts); if (ret) { pcv("unmounted %s, mounted R/O, but cannot re-mount it R/W", fsinfo.mount_point); return -1; } } if (rorw2) { flags = fsinfo.mount_flags | MS_RDONLY | MS_REMOUNT; ret = mount(fsinfo.fsdev, fsinfo.mount_point, fsinfo.fstype, flags, fsinfo.mount_opts); if (ret) { pcv("cannot re-mount %s R/O", fsinfo.mount_point); return -1; } flags = fsinfo.mount_flags | MS_REMOUNT; flags &= ~((unsigned long)MS_RDONLY); ret = mount(fsinfo.fsdev, fsinfo.mount_point, fsinfo.fstype, flags, fsinfo.mount_opts); if (ret) { pcv("remounted %s R/O, but cannot re-mount it back R/W", fsinfo.mount_point); return -1; } } return 0; } static void free_test_data(void) { if (top_dir) { free_fs_info(top_dir); free(top_dir->entry->name); free(top_dir->entry); free(top_dir); top_dir = NULL; } } int main(int argc, char *argv[]) { int ret; long rpt; ret = parse_opts(argc, argv); if (ret) return EXIT_FAILURE; get_tested_fs_info(); /* Seed the random generator with out PID */ random_seed = getpid(); random_name_buf = malloc(fsinfo.max_name_len + 1); CHECK(random_name_buf != NULL); /* Refuse the file-system if it is mounted R/O */ if (fsinfo.mount_flags & MS_RDONLY) { ret = -1; errmsg("the file-system is mounted read-only"); goto out_free; } /* Check whether we can re-mount the tested FS */ do { ret = recover_tested_fs(); } while (ret && args.power_cut_mode && errno == EROFS); if (!ret) { fsinfo.can_remount = 1; } else { warnmsg("file-system %s cannot be unmounted (%s)", fsinfo.mount_point, strerror(errno)); if (args.power_cut_mode) { /* * When testing emulated power cuts we have to be able * to re-mount the file-system to clean the EROFS * state. */ errmsg("power cut mode requers unmountable FS"); goto out_free; } } /* Do the actual test */ for (rpt = 0; ; rpt++) { ret = integck(); /* * Iterate forever only in case of power-cut emulation testing. */ if (!args.power_cut_mode) { CHECK(!ret); break; } CHECK(ret); CHECK(errno == EROFS || errno == EIO); close_open_files(); do { ret = recover_tested_fs(); if (ret) { CHECK(errno == EROFS); rpt += 1; } /* * Mount may also fail due to an emulated power cut * while mounting - keep re-starting. */ } while (ret); CHECK(chdir(fsinfo.mount_point) == 0); /* Make sure everything is readable after an emulated power cut */ if (top_dir) { /* Check the clean data */ check_tested_fs(); read_all(fsinfo.test_dir); } free_test_data(); /* * The file-system became read-only and we are in power cut * testing mode. Re-mount the file-system and re-start the * test. */ if (args.verbose) normsg("re-mount the FS and re-start - count %ld", rpt); } close_open_files(); free_test_data(); out_free: free(random_name_buf); free(fsinfo.mount_opts); free(fsinfo.mount_point); free(fsinfo.fstype); free(fsinfo.fsdev); free(fsinfo.test_dir); return ret ? EXIT_FAILURE : EXIT_SUCCESS; }