C++ reiserfs_update_sd函数代码示例

static int reiserfs_link(struct dentry *old_dentry, struct inode *dir,
			 struct dentry *dentry)
{
	int retval;
	struct inode *inode = d_inode(old_dentry);
	struct reiserfs_transaction_handle th;
	/*
	 * We need blocks for transaction + update of quotas for
	 * the owners of the directory
	 */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 +
	    2 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);

	retval = dquot_initialize(dir);
	if (retval)
		return retval;

	reiserfs_write_lock(dir->i_sb);
	if (inode->i_nlink >= REISERFS_LINK_MAX) {
		/* FIXME: sd_nlink is 32 bit for new files */
		reiserfs_write_unlock(dir->i_sb);
		return -EMLINK;
	}

	/* inc before scheduling so reiserfs_unlink knows we are here */
	inc_nlink(inode);

	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval) {
		drop_nlink(inode);
		reiserfs_write_unlock(dir->i_sb);
		return retval;
	}

	/* create new entry */
	retval =
	    reiserfs_add_entry(&th, dir, dentry->d_name.name,
			       dentry->d_name.len, inode, 1 /*visible */ );

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	if (retval) {
		int err;
		drop_nlink(inode);
		err = journal_end(&th);
		reiserfs_write_unlock(dir->i_sb);
		return err ? err : retval;
	}

	inode->i_ctime = current_time(inode);
	reiserfs_update_sd(&th, inode);

	ihold(inode);
	d_instantiate(dentry, inode);
	retval = journal_end(&th);
	reiserfs_write_unlock(dir->i_sb);
	return retval;
}

static int reiserfs_link(struct dentry *old_dentry, struct inode *dir,
			 struct dentry *dentry)
{
	int retval;
	struct inode *inode = old_dentry->d_inode;
	struct reiserfs_transaction_handle th;
	/* We need blocks for transaction + update of quotas for the owners of the directory */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 +
	    2 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);

	reiserfs_write_lock(dir->i_sb);
	if (inode->i_nlink >= REISERFS_LINK_MAX) {
		//FIXME: sd_nlink is 32 bit for new files
		reiserfs_write_unlock(dir->i_sb);
		return -EMLINK;
	}
	if (inode->i_nlink == 0) {
		reiserfs_write_unlock(dir->i_sb);
		return -ENOENT;
	}

	/* inc before scheduling so reiserfs_unlink knows we are here */
	inode->i_nlink++;

	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval) {
		inode->i_nlink--;
		reiserfs_write_unlock(dir->i_sb);
		return retval;
	}

	/* create new entry */
	retval =
	    reiserfs_add_entry(&th, dir, dentry->d_name.name,
			       dentry->d_name.len, inode, 1 /*visible */ );

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	if (retval) {
		int err;
		inode->i_nlink--;
		err = journal_end(&th, dir->i_sb, jbegin_count);
		reiserfs_write_unlock(dir->i_sb);
		return err ? err : retval;
	}

	inode->i_ctime = CURRENT_TIME_SEC;
	reiserfs_update_sd(&th, inode);

	atomic_inc(&inode->i_count);
	d_instantiate(dentry, inode);
	retval = journal_end(&th, dir->i_sb, jbegin_count);
	reiserfs_write_unlock(dir->i_sb);
	return retval;
}

static int reiserfs_create (struct inode * dir, struct dentry *dentry, int mode,
		struct nameidata *nd)
{
    int retval;
    struct inode * inode;
    int jbegin_count = JOURNAL_PER_BALANCE_CNT * 2 ;
    struct reiserfs_transaction_handle th ;
    int locked;

    if (!(inode = new_inode(dir->i_sb))) {
	return -ENOMEM ;
    }
    retval = new_inode_init(inode, dir, mode);
    if (retval)
        return retval;

    locked = reiserfs_cache_default_acl (dir);

    reiserfs_write_lock(dir->i_sb);

    if (locked)
        reiserfs_write_lock_xattrs (dir->i_sb);

    journal_begin(&th, dir->i_sb, jbegin_count) ;
    retval = reiserfs_new_inode (&th, dir, mode, 0, 0/*i_size*/, dentry, inode);

    if (locked)
        reiserfs_write_unlock_xattrs (dir->i_sb);

    if (retval) {
        goto out_failed;
    }
	
    inode->i_op = &reiserfs_file_inode_operations;
    inode->i_fop = &reiserfs_file_operations;
    inode->i_mapping->a_ops = &reiserfs_address_space_operations ;

    retval = reiserfs_add_entry (&th, dir, dentry->d_name.name, dentry->d_name.len, 
				inode, 1/*visible*/);
    if (retval) {
	inode->i_nlink--;
	reiserfs_update_sd (&th, inode);
	journal_end(&th, dir->i_sb, jbegin_count) ;
	iput (inode);
	goto out_failed;
    }
    reiserfs_update_inode_transaction(inode) ;
    reiserfs_update_inode_transaction(dir) ;

    d_instantiate(dentry, inode);
    journal_end(&th, dir->i_sb, jbegin_count) ;

out_failed:
    reiserfs_write_unlock(dir->i_sb);
    return retval;
}

/* we don't mark inodes dirty, we just log them */
static void reiserfs_dirty_inode (struct inode * inode) {
    struct reiserfs_transaction_handle th ;

    if (inode->i_sb->s_flags & MS_RDONLY) {
        reiserfs_warning("clm-6006: writing inode %lu on readonly FS\n", 
	                  inode->i_ino) ;
        return ;
    }
    lock_kernel() ;

    /* this is really only used for atime updates, so they don't have
    ** to be included in O_SYNC or fsync
    */
    journal_begin(&th, inode->i_sb, 1) ;
    reiserfs_update_sd (&th, inode);
    journal_end(&th, inode->i_sb, 1) ;
    unlock_kernel() ;
}

static void __discard_prealloc (struct reiserfs_transaction_handle * th,
                                struct reiserfs_inode_info *ei)
{
    unsigned long save = ei->i_prealloc_block ;
    int dirty = 0;
    struct inode *inode = &ei->vfs_inode;
    BUG_ON (!th->t_trans_id);
#ifdef CONFIG_REISERFS_CHECK
    if (ei->i_prealloc_count < 0)
        reiserfs_warning (th->t_super, "zam-4001:%s: inode has negative prealloc blocks count.", __FUNCTION__ );
#endif
    while (ei->i_prealloc_count > 0) {
        reiserfs_free_prealloc_block(th, inode, ei->i_prealloc_block);
        ei->i_prealloc_block++;
        ei->i_prealloc_count --;
        dirty = 1;
    }
    if (dirty)
        reiserfs_update_sd(th, inode);
    ei->i_prealloc_block = save;
    list_del_init(&(ei->i_prealloc_list));
}

static int reiserfs_rmdir(struct inode *dir, struct dentry *dentry)
{
	int retval, err;
	struct inode *inode;
	struct reiserfs_transaction_handle th;
	int jbegin_count;
	INITIALIZE_PATH(path);
	struct reiserfs_dir_entry de;

	/* we will be doing 2 balancings and update 2 stat data, we change quotas
	 * of the owner of the directory and of the owner of the parent directory.
	 * The quota structure is possibly deleted only on last iput => outside
	 * of this transaction */
	jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 2 + 2 +
	    4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);

	dquot_initialize(dir);

	reiserfs_write_lock(dir->i_sb);
	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval)
		goto out_rmdir;

	de.de_gen_number_bit_string = NULL;
	if ((retval =
	     reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
				 &path, &de)) == NAME_NOT_FOUND) {
		retval = -ENOENT;
		goto end_rmdir;
	} else if (retval == IO_ERROR) {
		retval = -EIO;
		goto end_rmdir;
	}

	inode = dentry->d_inode;

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	if (de.de_objectid != inode->i_ino) {
		// FIXME: compare key of an object and a key found in the
		// entry
		retval = -EIO;
		goto end_rmdir;
	}
	if (!reiserfs_empty_dir(inode)) {
		retval = -ENOTEMPTY;
		goto end_rmdir;
	}

	/* cut entry from dir directory */
	retval = reiserfs_cut_from_item(&th, &path, &(de.de_entry_key), dir, NULL,	/* page */
					0 /*new file size - not used here */ );
	if (retval < 0)
		goto end_rmdir;

	if (inode->i_nlink != 2 && inode->i_nlink != 1)
		reiserfs_error(inode->i_sb, "reiserfs-7040",
			       "empty directory has nlink != 2 (%d)",
			       inode->i_nlink);

	clear_nlink(inode);
	inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
	reiserfs_update_sd(&th, inode);

	DEC_DIR_INODE_NLINK(dir)
	    dir->i_size -= (DEH_SIZE + de.de_entrylen);
	reiserfs_update_sd(&th, dir);

	/* prevent empty directory from getting lost */
	add_save_link(&th, inode, 0 /* not truncate */ );

	retval = journal_end(&th, dir->i_sb, jbegin_count);
	reiserfs_check_path(&path);
      out_rmdir:
	reiserfs_write_unlock(dir->i_sb);
	return retval;

      end_rmdir:
	/* we must release path, because we did not call
	   reiserfs_cut_from_item, or reiserfs_cut_from_item does not
	   release path if operation was not complete */
	pathrelse(&path);
	err = journal_end(&th, dir->i_sb, jbegin_count);
	reiserfs_write_unlock(dir->i_sb);
	return err ? err : retval;
}

static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	int retval;
	struct inode *inode;
	struct reiserfs_transaction_handle th;
	struct reiserfs_security_handle security;
	int lock_depth;
	/* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 +
	    2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
		 REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));

	dquot_initialize(dir);

#ifdef DISPLACE_NEW_PACKING_LOCALITIES
	/* set flag that new packing locality created and new blocks for the content     * of that directory are not displaced yet */
	REISERFS_I(dir)->new_packing_locality = 1;
#endif
	mode = S_IFDIR | mode;
	if (!(inode = new_inode(dir->i_sb))) {
		return -ENOMEM;
	}
	new_inode_init(inode, dir, mode);

	jbegin_count += reiserfs_cache_default_acl(dir);
	retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
	if (retval < 0) {
		drop_new_inode(inode);
		return retval;
	}
	jbegin_count += retval;
	lock_depth = reiserfs_write_lock_once(dir->i_sb);

	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval) {
		drop_new_inode(inode);
		goto out_failed;
	}

	/* inc the link count now, so another writer doesn't overflow it while
	 ** we sleep later on.
	 */
	INC_DIR_INODE_NLINK(dir)

	    retval = reiserfs_new_inode(&th, dir, mode, NULL /*symlink */ ,
					old_format_only(dir->i_sb) ?
					EMPTY_DIR_SIZE_V1 : EMPTY_DIR_SIZE,
					dentry, inode, &security);
	if (retval) {
		DEC_DIR_INODE_NLINK(dir)
		goto out_failed;
	}

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	inode->i_op = &reiserfs_dir_inode_operations;
	inode->i_fop = &reiserfs_dir_operations;

	// note, _this_ add_entry will not update dir's stat data
	retval =
	    reiserfs_add_entry(&th, dir, dentry->d_name.name,
			       dentry->d_name.len, inode, 1 /*visible */ );
	if (retval) {
		int err;
		clear_nlink(inode);
		DEC_DIR_INODE_NLINK(dir);
		reiserfs_update_sd(&th, inode);
		err = journal_end(&th, dir->i_sb, jbegin_count);
		if (err)
			retval = err;
		unlock_new_inode(inode);
		iput(inode);
		goto out_failed;
	}
	// the above add_entry did not update dir's stat data
	reiserfs_update_sd(&th, dir);

	unlock_new_inode(inode);
	d_instantiate(dentry, inode);
	retval = journal_end(&th, dir->i_sb, jbegin_count);
out_failed:
	reiserfs_write_unlock_once(dir->i_sb, lock_depth);
	return retval;
}

static int reiserfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
			  dev_t rdev)
{
	int retval;
	struct inode *inode;
	struct reiserfs_transaction_handle th;
	struct reiserfs_security_handle security;
	/* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 +
	    2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
		 REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));

	if (!new_valid_dev(rdev))
		return -EINVAL;

	dquot_initialize(dir);

	if (!(inode = new_inode(dir->i_sb))) {
		return -ENOMEM;
	}
	new_inode_init(inode, dir, mode);

	jbegin_count += reiserfs_cache_default_acl(dir);
	retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
	if (retval < 0) {
		drop_new_inode(inode);
		return retval;
	}
	jbegin_count += retval;
	reiserfs_write_lock(dir->i_sb);

	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval) {
		drop_new_inode(inode);
		goto out_failed;
	}

	retval =
	    reiserfs_new_inode(&th, dir, mode, NULL, 0 /*i_size */ , dentry,
			       inode, &security);
	if (retval) {
		goto out_failed;
	}

	inode->i_op = &reiserfs_special_inode_operations;
	init_special_inode(inode, inode->i_mode, rdev);

	//FIXME: needed for block and char devices only
	reiserfs_update_sd(&th, inode);

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	retval =
	    reiserfs_add_entry(&th, dir, dentry->d_name.name,
			       dentry->d_name.len, inode, 1 /*visible */ );
	if (retval) {
		int err;
		drop_nlink(inode);
		reiserfs_update_sd(&th, inode);
		err = journal_end(&th, dir->i_sb, jbegin_count);
		if (err)
			retval = err;
		unlock_new_inode(inode);
		iput(inode);
		goto out_failed;
	}

	unlock_new_inode(inode);
	d_instantiate(dentry, inode);
	retval = journal_end(&th, dir->i_sb, jbegin_count);

      out_failed:
	reiserfs_write_unlock(dir->i_sb);
	return retval;
}

static int reiserfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
			   struct nameidata *nd)
{
	int retval;
	struct inode *inode;
	/* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 2 +
	    2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
		 REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
	struct reiserfs_transaction_handle th;
	struct reiserfs_security_handle security;

	dquot_initialize(dir);

	if (!(inode = new_inode(dir->i_sb))) {
		return -ENOMEM;
	}
	new_inode_init(inode, dir, mode);

	jbegin_count += reiserfs_cache_default_acl(dir);
	retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
	if (retval < 0) {
		drop_new_inode(inode);
		return retval;
	}
	jbegin_count += retval;
	reiserfs_write_lock(dir->i_sb);

	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval) {
		drop_new_inode(inode);
		goto out_failed;
	}

	retval =
	    reiserfs_new_inode(&th, dir, mode, NULL, 0 /*i_size */ , dentry,
			       inode, &security);
	if (retval)
		goto out_failed;

	inode->i_op = &reiserfs_file_inode_operations;
	inode->i_fop = &reiserfs_file_operations;
	inode->i_mapping->a_ops = &reiserfs_address_space_operations;

	retval =
	    reiserfs_add_entry(&th, dir, dentry->d_name.name,
			       dentry->d_name.len, inode, 1 /*visible */ );
	if (retval) {
		int err;
		drop_nlink(inode);
		reiserfs_update_sd(&th, inode);
		err = journal_end(&th, dir->i_sb, jbegin_count);
		if (err)
			retval = err;
		unlock_new_inode(inode);
		iput(inode);
		goto out_failed;
	}
	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	unlock_new_inode(inode);
	d_instantiate(dentry, inode);
	retval = journal_end(&th, dir->i_sb, jbegin_count);

      out_failed:
	reiserfs_write_unlock(dir->i_sb);
	return retval;
}

//.........这里部分代码省略.........
		buffer = small_buf;

	paste_size =
	    (get_inode_sd_version(dir) ==
	     STAT_DATA_V1) ? (DEH_SIZE + namelen) : buflen;

	/* fill buffer : directory entry head, name[, dir objectid | , stat data | ,stat data, dir objectid ] */
	deh = (struct reiserfs_de_head *)buffer;
	deh->deh_location = 0;	/* JDM Endian safe if 0 */
	put_deh_offset(deh, cpu_key_k_offset(&entry_key));
	deh->deh_state = 0;	/* JDM Endian safe if 0 */
	/* put key (ino analog) to de */
	deh->deh_dir_id = INODE_PKEY(inode)->k_dir_id;	/* safe: k_dir_id is le */
	deh->deh_objectid = INODE_PKEY(inode)->k_objectid;	/* safe: k_objectid is le */

	/* copy name */
	memcpy((char *)(deh + 1), name, namelen);
	/* padd by 0s to the 4 byte boundary */
	padd_item((char *)(deh + 1), ROUND_UP(namelen), namelen);

	/* entry is ready to be pasted into tree, set 'visibility' and 'stat data in entry' attributes */
	mark_de_without_sd(deh);
	visible ? mark_de_visible(deh) : mark_de_hidden(deh);

	/* find the proper place for the new entry */
	memset(bit_string, 0, sizeof(bit_string));
	de.de_gen_number_bit_string = bit_string;
	retval = reiserfs_find_entry(dir, name, namelen, &path, &de);
	if (retval != NAME_NOT_FOUND) {
		if (buffer != small_buf)
			kfree(buffer);
		pathrelse(&path);

		if (retval == IO_ERROR) {
			return -EIO;
		}

		if (retval != NAME_FOUND) {
			reiserfs_error(dir->i_sb, "zam-7002",
				       "reiserfs_find_entry() returned "
				       "unexpected value (%d)", retval);
		}

		return -EEXIST;
	}

	gen_number =
	    find_first_zero_bit(bit_string,
				MAX_GENERATION_NUMBER + 1);
	if (gen_number > MAX_GENERATION_NUMBER) {
		/* there is no free generation number */
		reiserfs_warning(dir->i_sb, "reiserfs-7010",
				 "Congratulations! we have got hash function "
				 "screwed up");
		if (buffer != small_buf)
			kfree(buffer);
		pathrelse(&path);
		return -EBUSY;
	}
	/* adjust offset of directory enrty */
	put_deh_offset(deh, SET_GENERATION_NUMBER(deh_offset(deh), gen_number));
	set_cpu_key_k_offset(&entry_key, deh_offset(deh));

	/* update max-hash-collisions counter in reiserfs_sb_info */
	PROC_INFO_MAX(th->t_super, max_hash_collisions, gen_number);

	if (gen_number != 0) {	/* we need to re-search for the insertion point */
		if (search_by_entry_key(dir->i_sb, &entry_key, &path, &de) !=
		    NAME_NOT_FOUND) {
			reiserfs_warning(dir->i_sb, "vs-7032",
					 "entry with this key (%K) already "
					 "exists", &entry_key);

			if (buffer != small_buf)
				kfree(buffer);
			pathrelse(&path);
			return -EBUSY;
		}
	}

	/* perform the insertion of the entry that we have prepared */
	retval =
	    reiserfs_paste_into_item(th, &path, &entry_key, dir, buffer,
				     paste_size);
	if (buffer != small_buf)
		kfree(buffer);
	if (retval) {
		reiserfs_check_path(&path);
		return retval;
	}

	dir->i_size += paste_size;
	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
	if (!S_ISDIR(inode->i_mode) && visible)
		// reiserfs_mkdir or reiserfs_rename will do that by itself
		reiserfs_update_sd(th, dir);

	reiserfs_check_path(&path);
	return 0;
}

//.........这里部分代码省略.........
				reiserfs_restore_prepared_buffer(old_inode->
								 i_sb,
								 dot_dot_de.
								 de_bh);
			continue;
		}
		if (S_ISDIR(old_inode_mode)) {
			if (item_moved(&dot_dot_ih, &dot_dot_entry_path) ||
			    !entry_points_to_object("..", 2, &dot_dot_de,
						    old_dir)) {
				reiserfs_restore_prepared_buffer(old_inode->
								 i_sb,
								 old_de.de_bh);
				reiserfs_restore_prepared_buffer(old_inode->
								 i_sb,
								 new_de.de_bh);
				reiserfs_restore_prepared_buffer(old_inode->
								 i_sb,
								 dot_dot_de.
								 de_bh);
				continue;
			}
		}

		RFALSE(S_ISDIR(old_inode_mode) &&
		       !buffer_journal_prepared(dot_dot_de.de_bh), "");

		break;
	}

	/* ok, all the changes can be done in one fell swoop when we
	   have claimed all the buffers needed. */

	mark_de_visible(new_de.de_deh + new_de.de_entry_num);
	set_ino_in_dir_entry(&new_de, INODE_PKEY(old_inode));
	journal_mark_dirty(&th, old_dir->i_sb, new_de.de_bh);

	mark_de_hidden(old_de.de_deh + old_de.de_entry_num);
	journal_mark_dirty(&th, old_dir->i_sb, old_de.de_bh);
	ctime = CURRENT_TIME_SEC;
	old_dir->i_ctime = old_dir->i_mtime = ctime;
	new_dir->i_ctime = new_dir->i_mtime = ctime;
	/* thanks to Alex Adriaanse <[email protected]> for patch which adds ctime update of
	   renamed object */
	old_inode->i_ctime = ctime;

	if (new_dentry_inode) {
		// adjust link number of the victim
		if (S_ISDIR(new_dentry_inode->i_mode)) {
			clear_nlink(new_dentry_inode);
		} else {
			drop_nlink(new_dentry_inode);
		}
		new_dentry_inode->i_ctime = ctime;
		savelink = new_dentry_inode->i_nlink;
	}

	if (S_ISDIR(old_inode_mode)) {
		/* adjust ".." of renamed directory */
		set_ino_in_dir_entry(&dot_dot_de, INODE_PKEY(new_dir));
		journal_mark_dirty(&th, new_dir->i_sb, dot_dot_de.de_bh);

		if (!new_dentry_inode)
			/* there (in new_dir) was no directory, so it got new link
			   (".."  of renamed directory) */
			INC_DIR_INODE_NLINK(new_dir);

		/* old directory lost one link - ".. " of renamed directory */
		DEC_DIR_INODE_NLINK(old_dir);
	}
	// looks like in 2.3.99pre3 brelse is atomic. so we can use pathrelse
	pathrelse(&new_entry_path);
	pathrelse(&dot_dot_entry_path);

	// FIXME: this reiserfs_cut_from_item's return value may screw up
	// anybody, but it will panic if will not be able to find the
	// entry. This needs one more clean up
	if (reiserfs_cut_from_item
	    (&th, &old_entry_path, &(old_de.de_entry_key), old_dir, NULL,
	     0) < 0)
		reiserfs_error(old_dir->i_sb, "vs-7060",
			       "couldn't not cut old name. Fsck later?");

	old_dir->i_size -= DEH_SIZE + old_de.de_entrylen;

	reiserfs_update_sd(&th, old_dir);
	reiserfs_update_sd(&th, new_dir);
	reiserfs_update_sd(&th, old_inode);

	if (new_dentry_inode) {
		if (savelink == 0)
			add_save_link(&th, new_dentry_inode,
				      0 /* not truncate */ );
		reiserfs_update_sd(&th, new_dentry_inode);
	}

	retval = journal_end(&th, old_dir->i_sb, jbegin_count);
	reiserfs_write_unlock(old_dir->i_sb);
	return retval;
}

static int reiserfs_mkdir (struct inode * dir, struct dentry *dentry, int mode)
{
    int retval;
    struct inode * inode;
    struct reiserfs_transaction_handle th ;
    int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3; 
    int locked;

#ifdef DISPLACE_NEW_PACKING_LOCALITIES
    /* set flag that new packing locality created and new blocks for the content     * of that directory are not displaced yet */
    REISERFS_I(dir)->new_packing_locality = 1;
#endif
    mode = S_IFDIR | mode;
    if (!(inode = new_inode(dir->i_sb))) {
	return -ENOMEM ;
    }
    retval = new_inode_init(inode, dir, mode);
    if (retval)
        return retval;

    locked = reiserfs_cache_default_acl (dir);

    reiserfs_write_lock(dir->i_sb);
    if (locked)
        reiserfs_write_lock_xattrs (dir->i_sb);
    journal_begin(&th, dir->i_sb, jbegin_count) ;

    /* inc the link count now, so another writer doesn't overflow it while
    ** we sleep later on.
    */
    INC_DIR_INODE_NLINK(dir)

    retval = reiserfs_new_inode (&th, dir, mode, 0/*symlink*/,
				old_format_only (dir->i_sb) ? 
				EMPTY_DIR_SIZE_V1 : EMPTY_DIR_SIZE,
				dentry, inode);
    if (locked)
        reiserfs_write_unlock_xattrs (dir->i_sb);

    if (retval) {
	dir->i_nlink-- ;
	goto out_failed;
    }
    reiserfs_update_inode_transaction(inode) ;
    reiserfs_update_inode_transaction(dir) ;

    inode->i_op = &reiserfs_dir_inode_operations;
    inode->i_fop = &reiserfs_dir_operations;

    // note, _this_ add_entry will not update dir's stat data
    retval = reiserfs_add_entry (&th, dir, dentry->d_name.name, dentry->d_name.len, 
				inode, 1/*visible*/);
    if (retval) {
	inode->i_nlink = 0;
	DEC_DIR_INODE_NLINK(dir);
	reiserfs_update_sd (&th, inode);
	journal_end(&th, dir->i_sb, jbegin_count) ;
	iput (inode);
	goto out_failed;
    }

    // the above add_entry did not update dir's stat data
    reiserfs_update_sd (&th, dir);

    d_instantiate(dentry, inode);
    journal_end(&th, dir->i_sb, jbegin_count) ;
out_failed:
    reiserfs_write_unlock(dir->i_sb);
    return retval;
}

int indirect2direct(struct reiserfs_transaction_handle *th,
		    struct inode *inode, struct page *page,
		    struct treepath *path,	
		    const struct cpu_key *item_key,	
		    loff_t n_new_file_size,	
		    char *mode)
{
	struct super_block *sb = inode->i_sb;
	struct item_head s_ih;
	unsigned long block_size = sb->s_blocksize;
	char *tail;
	int tail_len, round_tail_len;
	loff_t pos, pos1;	
	struct cpu_key key;

	BUG_ON(!th->t_trans_id);

	REISERFS_SB(sb)->s_indirect2direct++;

	*mode = M_SKIP_BALANCING;

	
	copy_item_head(&s_ih, PATH_PITEM_HEAD(path));

	tail_len = (n_new_file_size & (block_size - 1));
	if (get_inode_sd_version(inode) == STAT_DATA_V2)
		round_tail_len = ROUND_UP(tail_len);
	else
		round_tail_len = tail_len;

	pos =
	    le_ih_k_offset(&s_ih) - 1 + (ih_item_len(&s_ih) / UNFM_P_SIZE -
					 1) * sb->s_blocksize;
	pos1 = pos;

	
	
	

	tail = (char *)kmap(page);	

	if (path_changed(&s_ih, path)) {
		
		if (search_for_position_by_key(sb, item_key, path)
		    == POSITION_NOT_FOUND)
			reiserfs_panic(sb, "PAP-5520",
				       "item to be converted %K does not exist",
				       item_key);
		copy_item_head(&s_ih, PATH_PITEM_HEAD(path));
#ifdef CONFIG_REISERFS_CHECK
		pos = le_ih_k_offset(&s_ih) - 1 +
		    (ih_item_len(&s_ih) / UNFM_P_SIZE -
		     1) * sb->s_blocksize;
		if (pos != pos1)
			reiserfs_panic(sb, "vs-5530", "tail position "
				       "changed while we were reading it");
#endif
	}

	
	make_le_item_head(&s_ih, NULL, get_inode_item_key_version(inode),
			  pos1 + 1, TYPE_DIRECT, round_tail_len,
			  0xffff  );

	tail = tail + (pos & (PAGE_CACHE_SIZE - 1));

	PATH_LAST_POSITION(path)++;

	key = *item_key;
	set_cpu_key_k_type(&key, TYPE_DIRECT);
	key.key_length = 4;
	
	if (reiserfs_insert_item(th, path, &key, &s_ih, inode,
				 tail ? tail : NULL) < 0) {
		kunmap(page);
		return block_size - round_tail_len;
	}
	kunmap(page);

	
	reiserfs_update_sd(th, inode);

	
	
	

	*mode = M_CUT;

	
	
	REISERFS_I(inode)->i_first_direct_byte = pos1 + 1;

	return block_size - round_tail_len;
}

/* this first locks inode (neither reads nor sync are permitted),
   reads tail through page cache, insert direct item. When direct item
   inserted successfully inode is left locked. Return value is always
   what we expect from it (number of cut bytes). But when tail remains
   in the unformatted node, we set mode to SKIP_BALANCING and unlock
   inode */
int indirect2direct (struct reiserfs_transaction_handle *th, 
		     struct inode * p_s_inode,
		     struct page *page, 
		     struct path * p_s_path, /* path to the indirect item. */
		     const struct cpu_key * p_s_item_key, /* Key to look for unformatted node pointer to be cut. */
		     loff_t n_new_file_size, /* New file size. */
		     char * p_c_mode)
{
    struct super_block * p_s_sb = p_s_inode->i_sb;
    struct item_head      s_ih;
    unsigned long n_block_size = p_s_sb->s_blocksize;
    char * tail;
    int tail_len, round_tail_len;
    loff_t pos, pos1; /* position of first byte of the tail */
    struct cpu_key key;

    REISERFS_SB(p_s_sb)->s_indirect2direct ++;

    *p_c_mode = M_SKIP_BALANCING;

    /* store item head path points to. */
    copy_item_head (&s_ih, PATH_PITEM_HEAD(p_s_path));

    tail_len = (n_new_file_size & (n_block_size - 1));
    if (get_inode_sd_version (p_s_inode) == STAT_DATA_V2)
	round_tail_len = ROUND_UP (tail_len);
    else
	round_tail_len = tail_len;

    pos = le_ih_k_offset (&s_ih) - 1 + (ih_item_len(&s_ih) / UNFM_P_SIZE - 1) * p_s_sb->s_blocksize;
    pos1 = pos;

    // we are protected by i_sem. The tail can not disapper, not
    // append can be done either
    // we are in truncate or packing tail in file_release

    tail = (char *)kmap(page) ; /* this can schedule */

    if (path_changed (&s_ih, p_s_path)) {
	/* re-search indirect item */
	if ( search_for_position_by_key (p_s_sb, p_s_item_key, p_s_path) == POSITION_NOT_FOUND )
	    reiserfs_panic(p_s_sb, "PAP-5520: indirect2direct: "
			   "item to be converted %K does not exist", p_s_item_key);
	copy_item_head(&s_ih, PATH_PITEM_HEAD(p_s_path));
#ifdef CONFIG_REISERFS_CHECK
	pos = le_ih_k_offset (&s_ih) - 1 + 
	    (ih_item_len(&s_ih) / UNFM_P_SIZE - 1) * p_s_sb->s_blocksize;
	if (pos != pos1)
	    reiserfs_panic (p_s_sb, "vs-5530: indirect2direct: "
			    "tail position changed while we were reading it");
#endif
    }


    /* Set direct item header to insert. */
    make_le_item_head (&s_ih, NULL, get_inode_item_key_version (p_s_inode), pos1 + 1,
		       TYPE_DIRECT, round_tail_len, 0xffff/*ih_free_space*/);

    /* we want a pointer to the first byte of the tail in the page.
    ** the page was locked and this part of the page was up to date when
    ** indirect2direct was called, so we know the bytes are still valid
    */
    tail = tail + (pos & (PAGE_CACHE_SIZE - 1)) ;

    PATH_LAST_POSITION(p_s_path)++;

    key = *p_s_item_key;
    set_cpu_key_k_type (&key, TYPE_DIRECT);
    key.key_length = 4;
    /* Insert tail as new direct item in the tree */
    if ( reiserfs_insert_item(th, p_s_path, &key, &s_ih, p_s_inode,
			      tail ? tail : NULL) < 0 ) {
	/* No disk memory. So we can not convert last unformatted node
	   to the direct item.  In this case we used to adjust
	   indirect items's ih_free_space. Now ih_free_space is not
	   used, it would be ideal to write zeros to corresponding
	   unformatted node. For now i_size is considered as guard for
	   going out of file size */
	kunmap(page) ;
	return n_block_size - round_tail_len;
    }
    kunmap(page) ;

    /* make sure to get the i_blocks changes from reiserfs_insert_item */
    reiserfs_update_sd(th, p_s_inode);

    // note: we have now the same as in above direct2indirect
    // conversion: there are two keys which have matching first three
    // key components. They only differ by the fouhth one.

    /* We have inserted new direct item and must remove last
       unformatted node. */
    *p_c_mode = M_CUT;

//.........这里部分代码省略.........

static int reiserfs_symlink (struct inode * parent_dir, 
                            struct dentry * dentry, const char * symname)
{
    int retval;
    struct inode * inode;
    char * name;
    int item_len;
    struct reiserfs_transaction_handle th ;
    int mode = S_IFLNK | S_IRWXUGO;
    int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3; 

    if (!(inode = new_inode(parent_dir->i_sb))) {
	return -ENOMEM ;
    }
    retval = new_inode_init(inode, parent_dir, mode);
    if (retval) {
        return retval;
    }

    reiserfs_write_lock(parent_dir->i_sb);
    item_len = ROUND_UP (strlen (symname));
    if (item_len > MAX_DIRECT_ITEM_LEN (parent_dir->i_sb->s_blocksize)) {
	retval =  -ENAMETOOLONG;
	drop_new_inode(inode);
	goto out_failed;
    }
  
    name = reiserfs_kmalloc (item_len, GFP_NOFS, parent_dir->i_sb);
    if (!name) {
	drop_new_inode(inode);
	retval =  -ENOMEM;
	goto out_failed;
    }
    memcpy (name, symname, strlen (symname));
    padd_item (name, item_len, strlen (symname));

    /* We would inherit the default ACL here, but symlinks don't get ACLs */

    journal_begin(&th, parent_dir->i_sb, jbegin_count) ;

    retval = reiserfs_new_inode (&th, parent_dir, mode, name, strlen (symname), 
                                 dentry, inode);
    reiserfs_kfree (name, item_len, parent_dir->i_sb);
    if (retval) { /* reiserfs_new_inode iputs for us */
	goto out_failed;
    }

    reiserfs_update_inode_transaction(inode) ;
    reiserfs_update_inode_transaction(parent_dir) ;

    inode->i_op = &reiserfs_symlink_inode_operations;
    inode->i_mapping->a_ops = &reiserfs_address_space_operations;

    // must be sure this inode is written with this transaction
    //
    //reiserfs_update_sd (&th, inode, READ_BLOCKS);

    retval = reiserfs_add_entry (&th, parent_dir, dentry->d_name.name, 
                                 dentry->d_name.len, inode, 1/*visible*/);
    if (retval) {
	inode->i_nlink--;
	reiserfs_update_sd (&th, inode);
	journal_end(&th, parent_dir->i_sb, jbegin_count) ;
	iput (inode);
	goto out_failed;
    }

    d_instantiate(dentry, inode);
    journal_end(&th, parent_dir->i_sb, jbegin_count) ;
out_failed:
    reiserfs_write_unlock(parent_dir->i_sb);
    return retval;
}