/* vi: set sw=4 ts=4: *//* * mkjournal.c --- make a journal for a filesystem * * Copyright (C) 2000 Theodore Ts'o. * * %Begin-Header% * This file may be redistributed under the terms of the GNU Public * License. * %End-Header% */#include <stdio.h>#include <string.h>#if HAVE_UNISTD_H#include <unistd.h>#endif#if HAVE_ERRNO_H#include <errno.h>#endif#include <fcntl.h>#include <time.h>#if HAVE_SYS_STAT_H#include <sys/stat.h>#endif#if HAVE_SYS_TYPES_H#include <sys/types.h>#endif#if HAVE_SYS_IOCTL_H#include <sys/ioctl.h>#endif#if HAVE_NETINET_IN_H#include <netinet/in.h>#endif#include "ext2_fs.h"#include "../e2p/e2p.h"#include "../e2fsck.h"#include "ext2fs.h"#include "kernel-jbd.h"/* * This function automatically sets up the journal superblock and * returns it as an allocated block. */errcode_t ext2fs_create_journal_superblock(ext2_filsys fs,					   __u32 size, int flags,					   char  **ret_jsb){	errcode_t		retval;	journal_superblock_t	*jsb;	if (size < 1024)		return EXT2_ET_JOURNAL_TOO_SMALL;	if ((retval = ext2fs_get_mem(fs->blocksize, &jsb)))		return retval;	memset (jsb, 0, fs->blocksize);	jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);	if (flags & EXT2_MKJOURNAL_V1_SUPER)		jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V1);	else		jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);	jsb->s_blocksize = htonl(fs->blocksize);	jsb->s_maxlen = htonl(size);	jsb->s_nr_users = htonl(1);	jsb->s_first = htonl(1);	jsb->s_sequence = htonl(1);	memcpy(jsb->s_uuid, fs->super->s_uuid, sizeof(fs->super->s_uuid));	/*	 * If we're creating an external journal device, we need to	 * adjust these fields.	 */	if (fs->super->s_feature_incompat &	    EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {		jsb->s_nr_users = 0;		if (fs->blocksize == 1024)			jsb->s_first = htonl(3);		else			jsb->s_first = htonl(2);	}	*ret_jsb = (char *) jsb;	return 0;}/* * This function writes a journal using POSIX routines.  It is used * for creating external journals and creating journals on live * filesystems. */static errcode_t write_journal_file(ext2_filsys fs, char *filename,				    blk_t size, int flags){	errcode_t	retval;	char		*buf = 0;	int		fd, ret_size;	blk_t		i;	if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf)))		return retval;	/* Open the device or journal file */	if ((fd = open(filename, O_WRONLY)) < 0) {		retval = errno;		goto errout;	}	/* Write the superblock out */	retval = EXT2_ET_SHORT_WRITE;	ret_size = write(fd, buf, fs->blocksize);	if (ret_size < 0) {		retval = errno;		goto errout;	}	if (ret_size != (int) fs->blocksize)		goto errout;	memset(buf, 0, fs->blocksize);	for (i = 1; i < size; i++) {		ret_size = write(fd, buf, fs->blocksize);		if (ret_size < 0) {			retval = errno;			goto errout;		}		if (ret_size != (int) fs->blocksize)			goto errout;	}	close(fd);	retval = 0;errout:	ext2fs_free_mem(&buf);	return retval;}/* * Helper function for creating the journal using direct I/O routines */struct mkjournal_struct {	int		num_blocks;	int		newblocks;	char		*buf;	errcode_t	err;};static int mkjournal_proc(ext2_filsys	fs,			   blk_t	*blocknr,			   e2_blkcnt_t	blockcnt,			   blk_t	ref_block EXT2FS_ATTR((unused)),			   int		ref_offset EXT2FS_ATTR((unused)),			   void		*priv_data){	struct mkjournal_struct *es = (struct mkjournal_struct *) priv_data;	blk_t	new_blk;	static blk_t	last_blk = 0;	errcode_t	retval;	if (*blocknr) {		last_blk = *blocknr;		return 0;	}	retval = ext2fs_new_block(fs, last_blk, 0, &new_blk);	if (retval) {		es->err = retval;		return BLOCK_ABORT;	}	if (blockcnt > 0)		es->num_blocks--;	es->newblocks++;	retval = io_channel_write_blk(fs->io, new_blk, 1, es->buf);	if (blockcnt == 0)		memset(es->buf, 0, fs->blocksize);	if (retval) {		es->err = retval;		return BLOCK_ABORT;	}	*blocknr = new_blk;	last_blk = new_blk;	ext2fs_block_alloc_stats(fs, new_blk, +1);	if (es->num_blocks == 0)		return (BLOCK_CHANGED | BLOCK_ABORT);	else		return BLOCK_CHANGED;}/* * This function creates a journal using direct I/O routines. */static errcode_t write_journal_inode(ext2_filsys fs, ext2_ino_t journal_ino,				     blk_t size, int flags){	char			*buf;	errcode_t		retval;	struct ext2_inode	inode;	struct mkjournal_struct	es;	if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf)))		return retval;	if ((retval = ext2fs_read_bitmaps(fs)))		return retval;	if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))		return retval;	if (inode.i_blocks > 0)		return EEXIST;	es.num_blocks = size;	es.newblocks = 0;	es.buf = buf;	es.err = 0;	retval = ext2fs_block_iterate2(fs, journal_ino, BLOCK_FLAG_APPEND,				       0, mkjournal_proc, &es);	if (es.err) {		retval = es.err;		goto errout;	}	if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))		goto errout;	inode.i_size += fs->blocksize * size;	inode.i_blocks += (fs->blocksize / 512) * es.newblocks;	inode.i_mtime = inode.i_ctime = time(0);	inode.i_links_count = 1;	inode.i_mode = LINUX_S_IFREG | 0600;	if ((retval = ext2fs_write_inode(fs, journal_ino, &inode)))		goto errout;	retval = 0;	memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);	fs->super->s_jnl_blocks[16] = inode.i_size;	fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;	ext2fs_mark_super_dirty(fs);errout:	ext2fs_free_mem(&buf);	return retval;}/* * This function adds a journal device to a filesystem */errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev){	struct stat	st;	errcode_t	retval;	char		buf[1024];	journal_superblock_t	*jsb;	int		start;	__u32		i, nr_users;	/* Make sure the device exists and is a block device */	if (stat(journal_dev->device_name, &st) < 0)		return errno;	if (!S_ISBLK(st.st_mode))		return EXT2_ET_JOURNAL_NOT_BLOCK; /* Must be a block device */	/* Get the journal superblock */	start = 1;	if (journal_dev->blocksize == 1024)		start++;	if ((retval = io_channel_read_blk(journal_dev->io, start, -1024, buf)))		return retval;	jsb = (journal_superblock_t *) buf;	if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||	    (jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2)))		return EXT2_ET_NO_JOURNAL_SB;	if (ntohl(jsb->s_blocksize) != (unsigned long) fs->blocksize)		return EXT2_ET_UNEXPECTED_BLOCK_SIZE;	/* Check and see if this filesystem has already been added */	nr_users = ntohl(jsb->s_nr_users);	for (i=0; i < nr_users; i++) {		if (memcmp(fs->super->s_uuid,			   &jsb->s_users[i*16], 16) == 0)			break;	}	if (i >= nr_users) {		memcpy(&jsb->s_users[nr_users*16],		       fs->super->s_uuid, 16);		jsb->s_nr_users = htonl(nr_users+1);	}	/* Writeback the journal superblock */	if ((retval = io_channel_write_blk(journal_dev->io, start, -1024, buf)))		return retval;	fs->super->s_journal_inum = 0;	fs->super->s_journal_dev = st.st_rdev;	memcpy(fs->super->s_journal_uuid, jsb->s_uuid,	       sizeof(fs->super->s_journal_uuid));	fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;	ext2fs_mark_super_dirty(fs);	return 0;}/* * This function adds a journal inode to a filesystem, using either * POSIX routines if the filesystem is mounted, or using direct I/O * functions if it is not. */errcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t size, int flags){	errcode_t		retval;	ext2_ino_t		journal_ino;	struct stat		st;	char			jfile[1024];	int			fd, mount_flags, f;	retval = ext2fs_check_mount_point(fs->device_name, &mount_flags,					       jfile, sizeof(jfile)-10);	if (retval)		return retval;	if (mount_flags & EXT2_MF_MOUNTED) {		strcat(jfile, "/.journal");		/*		 * If .../.journal already exists, make sure any		 * immutable or append-only flags are cleared.		 */#if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)		(void) chflags (jfile, 0);#else#if HAVE_EXT2_IOCTLS		fd = open(jfile, O_RDONLY);		if (fd >= 0) {			f = 0;			ioctl(fd, EXT2_IOC_SETFLAGS, &f);			close(fd);		}#endif#endif		/* Create the journal file */		if ((fd = open(jfile, O_CREAT|O_WRONLY, 0600)) < 0)			return errno;		if ((retval = write_journal_file(fs, jfile, size, flags)))			goto errout;		/* Get inode number of the journal file */		if (fstat(fd, &st) < 0)			goto errout;#if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)		retval = fchflags (fd, UF_NODUMP|UF_IMMUTABLE);#else#if HAVE_EXT2_IOCTLS		f = EXT2_NODUMP_FL | EXT2_IMMUTABLE_FL;		retval = ioctl(fd, EXT2_IOC_SETFLAGS, &f);#endif#endif		if (retval)			goto errout;		close(fd);		journal_ino = st.st_ino;	} else {		journal_ino = EXT2_JOURNAL_INO;		if ((retval = write_journal_inode(fs, journal_ino,						  size, flags)))			return retval;	}	fs->super->s_journal_inum = journal_ino;	fs->super->s_journal_dev = 0;	memset(fs->super->s_journal_uuid, 0,	       sizeof(fs->super->s_journal_uuid));	fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;	ext2fs_mark_super_dirty(fs);	return 0;errout:	close(fd);	return retval;}#ifdef DEBUGmain(int argc, char **argv){	errcode_t	retval;	char		*device_name;	ext2_filsys	fs;	if (argc < 2) {		fprintf(stderr, "Usage: %s filesystem\n", argv[0]);		exit(1);	}	device_name = argv[1];	retval = ext2fs_open (device_name, EXT2_FLAG_RW, 0, 0,			      unix_io_manager, &fs);	if (retval) {		com_err(argv[0], retval, "while opening %s", device_name);		exit(1);	}	retval = ext2fs_add_journal_inode(fs, 1024);	if (retval) {		com_err(argv[0], retval, "while adding journal to %s",			device_name);		exit(1);	}	retval = ext2fs_flush(fs);	if (retval) {		printf("Warning, had trouble writing out superblocks.\n");	}	ext2fs_close(fs);	exit(0);}#endif