ssize_t ext2lib_pread(fsi_file_t *file, void *buf, size_t nbytes, uint64_t off) { ext2_file_t *f = fsip_file_data(file); __u64 tmpoff; unsigned int n; int err; if ((err = ext2fs_file_llseek(*f, 0, EXT2_SEEK_CUR, &tmpoff)) != 0) { errno = EINVAL; return (-1); } if ((err = ext2fs_file_llseek(*f, off, EXT2_SEEK_SET, NULL)) != 0) { errno = EINVAL; return (-1); } err = ext2fs_file_read(*f, buf, nbytes, &n); ext2fs_file_llseek(*f, tmpoff, EXT2_SEEK_SET, NULL); if (err != 0) { errno = EINVAL; return (-1); } return (n); }
int op_read (const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi) { __u64 pos; errcode_t rc; unsigned int bytes; ext2_file_t efile = EXT2FS_FILE(fi->fh); ext2_filsys e2fs = current_ext2fs(); debugf("enter"); debugf("path = %s", path); efile = do_open(e2fs, path, O_RDONLY); rc = ext2fs_file_llseek(efile, offset, SEEK_SET, &pos); if (rc) { do_release(efile); return -EINVAL; } rc = ext2fs_file_read(efile, buf, size, &bytes); if (rc) { do_release(efile); return -EIO; } do_release(efile); debugf("leave"); return bytes; }
static errcode_t get_file(ext2_filsys fs, const char * filename, struct mem_file *ret_file) { errcode_t retval; char *buf; ext2_file_t e2_file = NULL; unsigned int got; struct ext2_inode inode; ext2_ino_t ino; ret_file->buf = 0; ret_file->size = 0; ret_file->ptr = 0; retval = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, filename, &ino); if (retval) return retval; retval = ext2fs_read_inode(fs, ino, &inode); if (retval) return retval; if (inode.i_size_high || (inode.i_size > 65536)) return EFBIG; buf = malloc(inode.i_size + 1); if (!buf) return ENOMEM; memset(buf, 0, inode.i_size+1); retval = ext2fs_file_open(fs, ino, 0, &e2_file); if (retval) goto errout; retval = ext2fs_file_read(e2_file, buf, inode.i_size, &got); if (retval) goto errout; retval = ext2fs_file_close(e2_file); if (retval) goto errout; ret_file->buf = buf; ret_file->size = (int) got; return 0; errout: free(buf); if (e2_file) ext2fs_file_close(e2_file); return retval; }
static void rdump_symlink(ext2_ino_t ino, struct ext2_inode *inode, const char *fullname) { ext2_file_t e2_file; char *buf; errcode_t retval; buf = malloc(inode->i_size + 1); if (!buf) { com_err("rdump", errno, "while allocating for symlink"); goto errout; } /* Apparently, this is the right way to detect and handle fast * symlinks; see do_stat() in debugfs.c. */ if (inode->i_blocks == 0) strcpy(buf, (char *) inode->i_block); else { unsigned bytes = inode->i_size; char *p = buf; retval = ext2fs_file_open(current_fs, ino, 0, &e2_file); if (retval) { com_err("rdump", retval, "while opening symlink"); goto errout; } for (;;) { unsigned int got; retval = ext2fs_file_read(e2_file, p, bytes, &got); if (retval) { com_err("rdump", retval, "while reading symlink"); goto errout; } bytes -= got; p += got; if (got == 0 || bytes == 0) break; } buf[inode->i_size] = 0; retval = ext2fs_file_close(e2_file); if (retval) com_err("rdump", retval, "while closing symlink"); } if (symlink(buf, fullname) == -1) { com_err("rdump", errno, "while creating symlink %s -> %s", buf, fullname); goto errout; } errout: free(buf); }
ssize_t ext2lib_read(fsi_file_t *file, void *buf, size_t nbytes) { ext2_file_t *f = fsip_file_data(file); unsigned int n; int err; err = ext2fs_file_read(*f, buf, nbytes, &n); if (err != 0) { errno = EINVAL; return (-1); } return (n); }
static void dump_file(const char *cmdname, ext2_ino_t ino, int fd, int preserve, char *outname) { errcode_t retval; struct ext2_inode inode; char *buf = 0; ext2_file_t e2_file; int nbytes; unsigned int got, blocksize = current_fs->blocksize; if (debugfs_read_inode(ino, &inode, cmdname)) return; retval = ext2fs_file_open(current_fs, ino, 0, &e2_file); if (retval) { com_err(cmdname, retval, "while opening ext2 file"); return; } retval = ext2fs_get_mem(blocksize, &buf); if (retval) { com_err(cmdname, retval, "while allocating memory"); return; } while (1) { retval = ext2fs_file_read(e2_file, buf, blocksize, &got); if (retval) com_err(cmdname, retval, "while reading ext2 file"); if (got == 0) break; nbytes = write(fd, buf, got); if ((unsigned) nbytes != got) com_err(cmdname, errno, "while writing file"); } if (buf) ext2fs_free_mem(&buf); retval = ext2fs_file_close(e2_file); if (retval) { com_err(cmdname, retval, "while closing ext2 file"); return; } if (preserve) fix_perms("dump_file", &inode, fd, outname); else if (fd != 1) close(fd); return; }
ssize_t ext2_read_r (struct _reent *r, int fd, char *ptr, size_t len) { // ext2_log_trace("fd %p, ptr %p, len %i\n", (void *) fd, ptr, len); ext2_file_state* file = STATE(fd); // Sanity check if (!file || !file->vd || !file->fd) { r->_errno = EINVAL; return -1; } // Short circuit cases where we don't actually have to do anything if (!ptr || len <= 0) { return 0; } // Lock ext2Lock(file->vd); // Check that we are allowed to read from this file if (!file->read) { ext2Unlock(file->vd); r->_errno = EACCES; return -1; } u32 read = 0; errcode_t err = 0; // Read from the files data attribute err = ext2fs_file_read(file->fd, ptr, len, &read); if (err || read <= 0 || read > len) { ext2Unlock(file->vd); r->_errno = errno; return err ? err : -1; } // Unlock ext2Unlock(file->vd); return (read == 0) ? -1 : read; }
static errcode_t inode_read_blk64(io_channel channel, unsigned long long block, int count, void *buf) { struct inode_private_data *data; errcode_t retval; EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); data = (struct inode_private_data *) channel->private_data; EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_INODE_IO_CHANNEL); if ((retval = ext2fs_file_lseek(data->file, block * channel->block_size, EXT2_SEEK_SET, 0))) return retval; count = (count < 0) ? -count : (count * channel->block_size); return ext2fs_file_read(data->file, buf, count, 0); }
static int read_journal_block(const char *cmd, struct journal_source *source, ext2_loff_t offset, char *buf, unsigned int size) { int retval; unsigned int got; if (source->where == JOURNAL_IS_EXTERNAL) { if (lseek(source->fd, offset, SEEK_SET) < 0) { retval = errno; goto seek_err; } retval = read(source->fd, buf, size); if (retval < 0) { retval = errno; goto read_err; } got = retval; retval = 0; } else { retval = ext2fs_file_llseek(source->file, offset, EXT2_SEEK_SET, NULL); if (retval) { seek_err: com_err(cmd, retval, "while seeking in reading journal"); return retval; } retval = ext2fs_file_read(source->file, buf, size, &got); if (retval) { read_err: com_err(cmd, retval, "while reading journal"); return retval; } } if (got != size) { com_err(cmd, 0, "short read (read %u, expected %u) " "while reading journal", got, size); retval = -1; } return retval; }
static int read_journal_block(const char *cmd, struct journal_source *source, off_t offset, char *buf, int size, unsigned int *got) { int retval; if (source->where == JOURNAL_IS_EXTERNAL) { if (lseek(source->fd, offset, SEEK_SET) < 0) { retval = errno; com_err(cmd, retval, "while seeking in reading journal"); return retval; } retval = read(source->fd, buf, size); if (retval >= 0) { *got = retval; retval = 0; } else retval = errno; } else { retval = ext2fs_file_lseek(source->file, offset, EXT2_SEEK_SET, NULL); if (retval) { com_err(cmd, retval, "while seeking in reading journal"); return retval; } retval = ext2fs_file_read(source->file, buf, size, got); } if (retval) com_err(cmd, retval, "while reading journal"); else if (*got != (unsigned int) size) { com_err(cmd, 0, "short read (read %d, expected %d) " "while reading journal", *got, size); retval = -1; } return retval; }
static void print_inline_journal_information(ext2_filsys fs) { journal_superblock_t *jsb; struct ext2_inode inode; ext2_file_t journal_file; errcode_t retval; ino_t ino = fs->super->s_journal_inum; char buf[1024]; __u32 *mask_ptr, mask, m; int i, j, size, printed = 0; if (fs->flags & EXT2_FLAG_IMAGE_FILE) return; retval = ext2fs_read_inode(fs, ino, &inode); if (retval) { com_err(program_name, retval, "%s", _("while reading journal inode")); exit(1); } retval = ext2fs_file_open2(fs, ino, &inode, 0, &journal_file); if (retval) { com_err(program_name, retval, "%s", _("while opening journal inode")); exit(1); } retval = ext2fs_file_read(journal_file, buf, sizeof(buf), 0); if (retval) { com_err(program_name, retval, "%s", _("while reading journal super block")); exit(1); } ext2fs_file_close(journal_file); jsb = (journal_superblock_t *) buf; if (be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) { fprintf(stderr, "%s", _("Journal superblock magic number invalid!\n")); exit(1); } printf("%s", _("Journal features: ")); for (i=0, mask_ptr=&jsb->s_feature_compat; i <3; i++,mask_ptr++) { mask = be32_to_cpu(*mask_ptr); for (j=0,m=1; j < 32; j++, m<<=1) { if (mask & m) { printf(" %s", e2p_jrnl_feature2string(i, m)); printed++; } } } if (printed == 0) printf(" (none)"); printf("\n"); fputs(_("Journal size: "), stdout); if ((fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_HUGE_FILE) && (inode.i_flags & EXT4_HUGE_FILE_FL)) size = inode.i_blocks / (fs->blocksize / 1024); else size = inode.i_blocks >> 1; if (size < 8192) printf("%uk\n", size); else printf("%uM\n", size >> 10); printf(_("Journal length: %u\n" "Journal sequence: 0x%08x\n" "Journal start: %u\n"), (unsigned int)ntohl(jsb->s_maxlen), (unsigned int)ntohl(jsb->s_sequence), (unsigned int)ntohl(jsb->s_start)); if (jsb->s_feature_compat & ext2fs_cpu_to_be32(JFS_FEATURE_COMPAT_CHECKSUM)) printf(_("Journal checksum type: crc32\n")); if (jsb->s_feature_incompat & ext2fs_cpu_to_be32(JFS_FEATURE_INCOMPAT_CSUM_V2)) printf(_("Journal checksum type: %s\n" "Journal checksum: 0x%08x\n"), journal_checksum_type_str(jsb->s_checksum_type), ext2fs_be32_to_cpu(jsb->s_checksum)); if (jsb->s_errno != 0) printf(_("Journal errno: %d\n"), (int) ntohl(jsb->s_errno)); }
/* Name: tail() * * Description: * * This function displays the last lines at the end of a file in an ext2 * file system. * * Algorithm: * * Get the directory and basename of the file * Determine the inode number for the file * Open the file for reading * Skip to the last block in the file * While we have not found the last num_lines of newline characters * Skip backwards in the file one block and read it * Display the contents of the block from that point on. * Display the rest of the file if not contained in the block * Save the current location of the file. * If we are following the file as it grows * While forever * Sleep * Re-read the inode for the file * If the size has changed * Display the file from the saved point on * Save the current location of the file. * * * Global Variables: * * None * * Arguments: * * ext2_filsys *fs; Our filesystem * ext2_ino_t root; The root directory inode number * char *input; The name of the input file to tail * int num_lines; The number of lines to display * int follow; Flag indicating if the we should follow any * new contents to the file. * int sleep_int; The number of seconds to sleep between checking * for new lines * char *cur_filesys * * Return Values: * * 0 - the last number of lines was displayed correctly. * an error occurred. * * Author: Keith W. Sheffield * Date: 08/07/2002 * * Modification History: * * MM/DD/YY Name Description */ static long tail(ext2_filsys *fs_ptr, ext2_ino_t root, char *input, int num_lines, int follow, int sleep_int, char *cur_filesys) { ext2_filsys fs = *fs_ptr; ext2_ino_t cwd; ext2_ino_t tail_ino; ext2_ino_t t_tail_ino; char *tail_dir; char *tail_name; long retval; char buf[BLK_SIZE]; unsigned int bytes_to_read; unsigned int bytes_read; char *ptr; struct ext2_inode inode; ext2_file_t tail_fd; ext2_off_t offset; ext2_off_t cur_pos; if (get_file_parts(fs, root, input, &cwd, &tail_dir, &tail_name)) { ext2fs_close(fs); return(-1); } /* get the inode number for the source file */ if ((retval = ext2fs_namei(fs, cwd, cwd, tail_name, &tail_ino))) { fprintf(stderr, "%s: file %s\n",error_message(retval), tail_name); return(retval); } /* open the file */ if ((retval = ext2fs_file_open(fs, tail_ino, 0, &tail_fd))) { fputs(error_message(retval), stderr); return retval; } /* get the length of the file and determine where to start reading */ inode.i_size = offset = ext2fs_file_get_size(tail_fd); bytes_to_read = offset % BLK_SIZE; if (bytes_to_read == 0) bytes_to_read = BLK_SIZE; offset -= bytes_to_read; if (((int32_t)offset) < 0) offset = 0; do { /* seek to the start of the last block in the file */ if ((retval = ext2fs_file_lseek(tail_fd, offset, EXT2_SEEK_SET, NULL))) { fputs(error_message(retval), stderr); return retval; } /* read the last block in the file */ if ((retval = ext2fs_file_read(tail_fd, buf, bytes_to_read, &bytes_read))) { fputs(error_message(retval), stderr); return retval; } if (bytes_to_read != bytes_read) { fputs("error reading file\n", stderr); return(-1); } ptr = buf + bytes_read - 1; while (bytes_to_read--) { if (*ptr == '\n' && num_lines-- == 0) { /* if the newline wasn't the last character in the buffer, then * print what's remaining. */ if (bytes_to_read != bytes_read - 1) { ptr++; if (0 > write(1, ptr, bytes_read - bytes_to_read - 1)) { perror("writing bytes to stdout"); return -1; } } offset = 0; /* make sure we break out of the main loop */ break; } ptr--; } offset -= (offset < BLK_SIZE) ? offset : BLK_SIZE; bytes_to_read = BLK_SIZE; } while (offset > 0); /* if we are here and have any lines left, we hit the beginning, so * dump the rest of what's in memory out. */ if (num_lines > 0) { if (0 > write(1, buf, bytes_read)) { perror("writing bytes to stdout"); return -1; } } /* retreive the current position in the file */ if ((retval = ext2fs_file_lseek(tail_fd, 0, EXT2_SEEK_CUR, &cur_pos))) { fputs(error_message(retval), stderr); return retval; } /* ok, if we are before the end of the file, then dump the rest of it */ if (cur_pos < inode.i_size) { if ((retval = read_to_eof(tail_fd, 1, cur_pos, &cur_pos))) { return retval; } } if ((retval = ext2fs_file_close(tail_fd))) { fputs(error_message(retval), stderr); return retval; } if (follow) { while(1) { sleep(sleep_int); /* I don't know how to force a re-read of the file system info yet, * so, just close the file system and reopen it. */ ext2fs_close(fs); if ((retval = open_filesystem(cur_filesys, &fs, &root, 0))) { *fs_ptr = NULL; fprintf(stderr, "%s: %s\n", error_message(retval), cur_filesys); return retval; } *fs_ptr = fs; /* if we are following the name, find the directory and file name * again. */ if (follow == FOLLOW_NAME) { cwd = root; if (tail_dir != NULL && *tail_dir != '\0' && strcmp(tail_dir, ",") != 0 && (retval = change_cwd(fs, root, &cwd, tail_dir))) { fprintf(stderr, "Error changing to directory %s\n", tail_dir); return(retval); } /* get the inode number for the source file */ if ((retval = ext2fs_namei(fs, cwd, cwd, tail_name, &t_tail_ino))) { fprintf(stderr, "%s: file %s\n",error_message(retval), tail_name); return(retval); } /* if we are dealing with a new file, then start from the * beginning. */ if (t_tail_ino != tail_ino) { tail_ino = t_tail_ino; cur_pos = 0; } } if ((retval = ext2fs_read_inode(fs, tail_ino, &inode))) { fputs(error_message(retval), stderr); return retval; } if (inode.i_size > cur_pos) { if ((retval = retrieve_data(fs, tail_ino, 1, NULL, 0, cur_pos, &cur_pos))) { fputs(error_message(retval), stderr); return retval; } } else if (inode.i_size < cur_pos) { /* the file was truncated, so bail */ return(0); } } } return(0); }
static int ext2_copy(disk_t *disk_car, const partition_t *partition, dir_data_t *dir_data, const file_info_t *file) { int error=0; FILE *f_out; const struct ext2_dir_struct *ls = (const struct ext2_dir_struct *)dir_data->private_dir_data; char *new_file; f_out=fopen_local(&new_file, dir_data->local_dir, dir_data->current_directory); if(!f_out) { log_critical("Can't create file %s: %s\n", new_file, strerror(errno)); free(new_file); return -4; } { errcode_t retval; struct ext2_inode inode; char buffer[8192]; ext2_file_t e2_file; if (ext2fs_read_inode(ls->current_fs, file->st_ino, &inode)!=0) { free(new_file); fclose(f_out); return -1; } retval = ext2fs_file_open(ls->current_fs, file->st_ino, 0, &e2_file); if (retval) { log_error("Error while opening ext2 file %s\n", dir_data->current_directory); free(new_file); fclose(f_out); return -2; } while (1) { int nbytes; unsigned int got; retval = ext2fs_file_read(e2_file, buffer, sizeof(buffer), &got); if (retval) { log_error("Error while reading ext2 file %s\n", dir_data->current_directory); error = -3; } if (got == 0) break; nbytes = fwrite(buffer, 1, got, f_out); if ((unsigned) nbytes != got) { log_error("Error while writing file %s\n", new_file); error = -5; } } retval = ext2fs_file_close(e2_file); if (retval) { log_error("Error while closing ext2 file\n"); error = -6; } fclose(f_out); set_date(new_file, file->td_atime, file->td_mtime); (void)set_mode(new_file, file->st_mode); } free(new_file); return error; }