自己动手写操作系统（第二版）于渊--光盘源码

/*************************************************************************//** ***************************************************************************** * @file disklog.c * @brief * @author Forrest Y. Yu * @date Thu Nov 20 16:22:45 2008 ***************************************************************************** *****************************************************************************/ #include "type.h" #include "config.h" #include "stdio.h" #include "const.h" #include "protect.h" #include "string.h" #include "fs.h" #include "proc.h" #include "tty.h" #include "console.h" #include "global.h" #include "keyboard.h" #include "proto.h" #include "hd.h" #include "fs.h" #define DISKLOG_RD_SECT(dev,sect_nr) rw_sector(DEV_READ, \ dev, \ (sect_nr) * SECTOR_SIZE, \ SECTOR_SIZE, /* read one sector */ \ getpid(), \ logdiskbuf); #define DISKLOG_WR_SECT(dev,sect_nr) rw_sector(DEV_WRITE, \ dev, \ (sect_nr) * SECTOR_SIZE, \ SECTOR_SIZE, /* write one sector */ \ getpid(), \ logdiskbuf); /* /\***************************************************************************** */ /* * do_disklog */ /* *****************************************************************************\/ */ /* /\** */ /* * Perform syslog() system call . */ /* * */ /* * @return */ /* *****************************************************************************\/ */ /* PUBLIC int do_disklog() */ /* { */ /* char buf[STR_DEFAULT_LEN]; */ /* /\* get parameters from the message *\/ */ /* int str_len = fs_msg.CNT; /\* length of filename *\/ */ /* int src = fs_msg.source; /\* caller proc nr. *\/ */ /* assert(str_len < STR_DEFAULT_LEN); */ /* phys_copy((void*)va2la(TASK_FS, buf), /\* to *\/ */ /* (void*)va2la(src, fs_msg.BUF), /\* from *\/ */ /* str_len); */ /* buf[str_len] = 0; /\* terminate the string *\/ */ /* return disklog(buf); */ /* } */ /***************************************************************************** * disklog *****************************************************************************/ /** * <Ring 1> Write log string directly into disk. * * @param p Ptr to the MESSAGE. *****************************************************************************/ PUBLIC int disklog(char * logstr) { int device = root_inode->i_dev; struct super_block * sb = get_super_block(device); int nr_log_blk0_nr = sb->nr_sects - NR_SECTS_FOR_LOG; /* 0x9D41-0x800=0x9541 */ static int pos = 0; if (!pos) { /* first time invoking this routine */ #ifdef SET_LOG_SECT_SMAP_AT_STARTUP /* * set sector-map so that other files cannot use the log sectors */ int bits_per_sect = SECTOR_SIZE * 8; /* 4096 */ int smap_blk0_nr = 1 + 1 + sb->nr_imap_sects; /* 3 */ int sect_nr = smap_blk0_nr + nr_log_blk0_nr / bits_per_sect; /* 3+9=12 */ int byte_off = (nr_log_blk0_nr % bits_per_sect) / 8; /* 168 */ int bit_off = (nr_log_blk0_nr % bits_per_sect) % 8; /* 1 */ int sect_cnt = NR_SECTS_FOR_LOG / bits_per_sect + 2; /* 1 */ int bits_left= NR_SECTS_FOR_LOG; /* 2048 */ int i; for (i = 0; i < sect_cnt; i++) { DISKLOG_RD_SECT(device, sect_nr + i); /* DISKLOG_RD_SECT(?, 12) */ for (; byte_off < SECTOR_SIZE && bits_left > 0; byte_off++) { for (; bit_off < 8; bit_off++) { /* repeat till enough bits are set */ assert(((logdiskbuf[byte_off] >> bit_off) & 1) == 0); logdiskbuf[byte_off] |= (1 << bit_off); if (--bits_left == 0) break; } bit_off = 0; } byte_off = 0; bit_off = 0; DISKLOG_WR_SECT(device, sect_nr + i); if (bits_left == 0) break; } assert(bits_left == 0); #endif /* SET_LOG_SECT_SMAP_AT_STARTUP */ pos = 0x40; #ifdef MEMSET_LOG_SECTS /* write padding stuff to log sectors */ int chunk = min(MAX_IO_BYTES, LOGDISKBUF_SIZE >> SECTOR_SIZE_SHIFT); assert(chunk == 256); int sects_left = NR_SECTS_FOR_LOG; for (i = nr_log_blk0_nr; i < nr_log_blk0_nr + NR_SECTS_FOR_LOG; i += chunk) { memset(logdiskbuf, 0x20, chunk*SECTOR_SIZE); rw_sector(DEV_WRITE, device, i * SECTOR_SIZE, chunk * SECTOR_SIZE, getpid(), logdiskbuf); sects_left -= chunk; } if (sects_left != 0) panic("sects_left should be 0, current: %d.", sects_left); #endif /* MEMSET_LOG_SECTS */ } char * p = logstr; int bytes_left = strlen(logstr); int sect_nr = nr_log_blk0_nr + (pos >> SECTOR_SIZE_SHIFT); while (bytes_left) { DISKLOG_RD_SECT(device, sect_nr); int off = pos % SECTOR_SIZE; int bytes = min(bytes_left, SECTOR_SIZE - off); memcpy(&logdiskbuf[off], p, bytes); off += bytes; bytes_left -= bytes; DISKLOG_WR_SECT(device, sect_nr); sect_nr++; pos += bytes; p += bytes; } struct time t; MESSAGE msg; msg.type = GET_RTC_TIME; msg.BUF= &t; send_recv(BOTH, TASK_SYS, &msg); /* write `pos' and time into the log file header */ DISKLOG_RD_SECT(device, nr_log_blk0_nr); sprintf((char*)logdiskbuf, "%8d\n", pos); memset(logdiskbuf+9, ' ', 22); logdiskbuf[31] = '\n'; sprintf((char*)logdiskbuf+32, "<%d-%02d-%02d %02d:%02d:%02d>\n", t.year, t.month, t.day, t.hour, t.minute, t.second); memset(logdiskbuf+32+22, ' ', 9); logdiskbuf[63] = '\n'; DISKLOG_WR_SECT(device, nr_log_blk0_nr); memset(logdiskbuf+64, logdiskbuf[32+19], 512-64); DISKLOG_WR_SECT(device, nr_log_blk0_nr + NR_SECTS_FOR_LOG - 1); return pos; } /* /\***************************************************************************** */ /* * inode2filename */ /* *****************************************************************************\/ */ /* /\** */ /* * Get filename via i-node */ /* * */ /* * @param inode */ /* * @param filename */ /* * */ /* * @return */ /* *****************************************************************************\/ */ /* PRIVATE char * inode2filename(int inode, char * filename) */ /* { */ /* int i, j; */ /* struct inode * dir_inode = root_inode; */ /* /\** */ /* * Search the dir for the file. */ /* *\/ */ /* int dir_blk0_nr = dir_inode->i_start_sect; */ /* int nr_dir_blks = (dir_inode->i_size + SECTOR_SIZE - 1) / SECTOR_SIZE; */ /* int nr_dir_entries = */ /* dir_inode->i_size / DIR_ENTRY_SIZE; /\** */ /* * including unused slots */ /* * (the file has been deleted */ /* * but the slot is still there) */ /* *\/ */ /* int m = 0; */ /* struct dir_entry * pde; */ /* for (i = 0; i < nr_dir_blks; i++) { */ /* DISKLOG_RD_SECT(dir_inode->i_dev, dir_blk0_nr + i); */ /* pde = (struct dir_entry *)logdiskbuf; */ /* for (j = 0; j < SECTOR_SIZE / DIR_ENTRY_SIZE; j++,pde++) { */ /* if (pde->inode_nr == inode) { */ /* memcpy(filename, pde->name, MAX_FILENAME_LEN); */ /* filename[MAX_FILENAME_LEN] = 0; */ /* if (filename[0] == '.') */ /* filename[0] = '/'; */ /* return filename; */ /* } */ /* if (++m > nr_dir_entries) */ /* break; */ /* } */ /* if (m > nr_dir_entries) /\* all entries have been iterated *\/ */ /* break; */ /* } */ /* /\* file not found *\/ */ /* return 0; */ /* } */ #define LOG_PROCS 1 /* YES */ #define LOG_FD_TABLE 1 #define LOG_INODE_TABLE 1 #define LOG_SMAP 1 #define LOG_IMAP 1 #define LOG_INODE_ARRAY 1 #define LOG_ROOT_DIR 1 #define LOG_MSG_SRC2DST 1 /* YES */ #define LOG_ARROW_PARENT_CHILD 1 /* YES */ #define LOG_ARROW_PROC_FD 1 #define LOG_ARROW_FD_INODE 1 #define LOG_ARROW_INODE_INODEARRAY 1 #if (LOG_SMAP == 1 || LOG_IMAP == 1 || LOG_INODE_ARRAY || LOG_ROOT_DIR == 1) static char _buf[SECTOR_SIZE]; #endif /***************************************************************************** * dump_fd_graph *****************************************************************************/ /** * Output a dot graph file. * *****