hammer_acl.c

/*
 * Copyright (c) 2015 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Matthew Dillon <dillon@backplane.com>
 * by Antonio Huete Jimenez <tuxillo@quantumachine.net>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "hammer.h"


static int
locate_objid(hammer_transaction_t transp, hammer_inode_t ip,
    hammer_cursor_t cursorp)
{
	struct hammer_btree_leaf_elm leaf;
	int error;

	bzero(&leaf, sizeof(leaf));

	/* XXX Check if ip->cache is null */
	error = hammer_init_cursor(transp, cursorp, &ip->cache[0], ip);
	if (error) {
		hammer_done_cursor(cursorp);
		return error;
	}

	/*
	 * Starting point for the search
	 */
	cursorp->key_beg.localization = ip->obj_localization +
	    HAMMER_LOCALIZE_MISC;
	cursorp->key_beg.obj_id = ip->ino_leaf.base.obj_id;
	cursorp->key_beg.create_tid = 0;
	cursorp->key_beg.delete_tid = 0;
	cursorp->key_beg.obj_type = HAMMER_OBJTYPE_UNKNOWN;
	cursorp->key_beg.rec_type = HAMMER_RECTYPE_EXT;
	cursorp->key_beg.key = 0;	/* First ACL entry */

	cursorp->asof = ip->obj_asof;
	cursorp->flags |= HAMMER_CURSOR_ASOF;

	/*
	 * Ending point for the search
	 */

	return 0;
}

static void __unused
dumpdata(acl_entry_t ae)
{
	int i;
	char *p;
	unsigned char c;
	p = (char *)ae;
	for (i = 0; i < sizeof(*ae); i++) {
		c = *(p+i);
		kprintf("%02x ", c);
	}
	kprintf("\n");
}

int
hammer_acl_lookup_get(hammer_transaction_t transp, hammer_inode_t ip,
    hammer_acl_t hap)
{
	struct hammer_cursor cursor;
	struct acl_entry *ae;
	int error = 0;
	int idx = 0;

	locate_objid(transp, ip, &cursor);

	/*
	 * ACLs entries are stored in the btree as special records
	 * HAMMER_RECTYPE_EXT and indexed by their obj_id. Each entry
	 * has a key corresponding to its position in the acl_entry array
	 * in struct acl.
	 */
	while (error == 0 && idx < ACL_MAX_ENTRIES) {
		error = hammer_ip_lookup(&cursor);
		if (error)
			goto out;
		kprintf("%s: objid=%jd key=%jd loc=0x%x\n", __func__,
		    cursor.leaf->base.obj_id, cursor.leaf->base.key,
		    cursor.leaf->base.localization);

		error = hammer_ip_resolve_data(&cursor);
		if (error)
			goto out;
		ae = &hap->acl.acl_entry[idx++];
		bcopy((char *)&cursor.data, (char *)ae, cursor.leaf->data_len);
//		dumpdata(ae);
		cursor.key_beg.key = (int64_t)idx;

	}

out:
	hap->acl.acl_cnt = idx;

	hammer_done_cursor(&cursor);

	return error;
}

int
hammer_acl_set(hammer_transaction_t transp, hammer_inode_t ip,
    acl_type_t typep, acl_t aclp)
{
	struct hammer_cursor cursor;
	struct acl_entry *ae;
	hammer_record_t record;
	hammer_mount_t hmp;
	int error;
	int i;

	error = 0;
	hmp = ip->hmp;

	error = locate_objid(transp, ip, &cursor);
	if (error)
		goto out;

//	error = hammer_ip_first(&cursor);
//	if (error && error != ENOENT)
//		goto out;
	for (i = 0; i < aclp->acl_cnt && i < ACL_MAX_ENTRIES; i++) {
		if (cursor.leaf) {
			kprintf("%s: objid=%jd key=%jd loc=0x%x\n", __func__,
			    cursor.leaf->base.obj_id, cursor.leaf->base.key,
			    cursor.leaf->base.localization);
		}
		record = hammer_alloc_mem_record(ip, sizeof(struct acl_entry));
		record->type = HAMMER_MEM_RECORD_GENERAL;
		record->leaf.base.localization = ip->obj_localization +
		    HAMMER_LOCALIZE_MISC;
		record->leaf.base.rec_type = HAMMER_RECTYPE_EXT;
		record->leaf.base.obj_id = ip->ino_leaf.base.obj_id;
		record->leaf.base.obj_type = HAMMER_OBJTYPE_UNKNOWN;
		record->leaf.base.key = i;
		record->leaf.data_len = sizeof(*ae);
		ae = &aclp->acl_entry[i];
		bcopy((char *)ae, (char *)record->data, sizeof(*ae));
		error = hammer_mem_add(record);
		kprintf("id=%d perm=%d\n", ae->ae_id, ae->ae_perm);
	}

out:
	hammer_done_cursor(&cursor);

	return error;
}