Esempio n. 1
0
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;
	struct reiserfs_security_handle security;
	int mode = S_IFLNK | S_IRWXUGO;
	/* 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(parent_dir->i_sb) +
		 REISERFS_QUOTA_TRANS_BLOCKS(parent_dir->i_sb));

	dquot_initialize(parent_dir);

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

	retval = reiserfs_security_init(parent_dir, inode, &dentry->d_name,
					&security);
	if (retval < 0) {
		drop_new_inode(inode);
		return retval;
	}
	jbegin_count += 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 = kmalloc(item_len, GFP_NOFS);
	if (!name) {
		drop_new_inode(inode);
		retval = -ENOMEM;
		goto out_failed;
	}
	memcpy(name, symname, strlen(symname));
	padd_item(name, item_len, strlen(symname));

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

	retval =
	    reiserfs_new_inode(&th, parent_dir, mode, name, strlen(symname),
			       dentry, inode, &security);
	kfree(name);
	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) {
		int err;
		drop_nlink(inode);
		reiserfs_update_sd(&th, inode);
		err = journal_end(&th, parent_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, parent_dir->i_sb, jbegin_count);
      out_failed:
	reiserfs_write_unlock(parent_dir->i_sb);
	return retval;
}
Esempio n. 2
0
static int reiserfs_add_entry(struct reiserfs_transaction_handle *th,
			      struct inode *dir, const char *name, int namelen,
			      struct inode *inode, int visible)
{
	struct cpu_key entry_key;
	struct reiserfs_de_head *deh;
	INITIALIZE_PATH(path);
	struct reiserfs_dir_entry de;
	DECLARE_BITMAP(bit_string, MAX_GENERATION_NUMBER + 1);
	int gen_number;
	char small_buf[32 + DEH_SIZE];	/* 48 bytes now and we avoid kmalloc
					   if we create file with short name */
	char *buffer;
	int buflen, paste_size;
	int retval;

	BUG_ON(!th->t_trans_id);

	/* cannot allow items to be added into a busy deleted directory */
	if (!namelen)
		return -EINVAL;

	if (namelen > REISERFS_MAX_NAME(dir->i_sb->s_blocksize))
		return -ENAMETOOLONG;

	/* each entry has unique key. compose it */
	make_cpu_key(&entry_key, dir,
		     get_third_component(dir->i_sb, name, namelen),
		     TYPE_DIRENTRY, 3);

	/* get memory for composing the entry */
	buflen = DEH_SIZE + ROUND_UP(namelen);
	if (buflen > sizeof(small_buf)) {
		buffer = kmalloc(buflen, GFP_NOFS);
		if (!buffer)
			return -ENOMEM;
	} else
		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;
}
Esempio n. 3
0
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;
}