[mirror_zfs.git] / module / zfs / zfs_byteswap.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or https://opensource.org/licenses/CDDL-1.0.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/zfs_context.h>
#include <sys/vfs.h>
#include <sys/fs/zfs.h>
#include <sys/zfs_znode.h>
#include <sys/zfs_sa.h>
#include <sys/zfs_acl.h>

#ifndef _KERNEL
static
#endif
void
zfs_oldace_byteswap(ace_t *ace, int ace_cnt)
{
	for (int i = 0; i != ace_cnt; i++, ace++) {
		ace->a_who = BSWAP_32(ace->a_who);
		ace->a_access_mask = BSWAP_32(ace->a_access_mask);
		ace->a_flags = BSWAP_16(ace->a_flags);
		ace->a_type = BSWAP_16(ace->a_type);
	}
}

/*
 * swap ace_t and ace_object_t
 */
#ifndef _KERNEL
static
#endif
void
zfs_ace_byteswap(void *buf, size_t size, boolean_t zfs_layout)
{
	caddr_t end;
	caddr_t ptr;
	zfs_ace_t *zacep = NULL;
	ace_t *acep;
	uint16_t entry_type;
	size_t entry_size;
	int ace_type;

	end = (caddr_t)buf + size;
	ptr = buf;

	while (ptr < end) {
		if (zfs_layout) {
			/*
			 * Avoid overrun.  Embedded aces can have one
			 * of several sizes.  We don't know exactly
			 * how many our present, only the size of the
			 * buffer containing them.  That size may be
			 * larger than needed to hold the aces
			 * present.  As long as we do not do any
			 * swapping beyond the end of our block we are
			 * okay.  It is safe to swap any non-ace data
			 * within the block since it is just zeros.
			 */
			if (ptr + sizeof (zfs_ace_hdr_t) > end) {
				break;
			}
			zacep = (zfs_ace_t *)ptr;
			zacep->z_hdr.z_access_mask =
			    BSWAP_32(zacep->z_hdr.z_access_mask);
			zacep->z_hdr.z_flags = BSWAP_16(zacep->z_hdr.z_flags);
			ace_type = zacep->z_hdr.z_type =
			    BSWAP_16(zacep->z_hdr.z_type);
			entry_type = zacep->z_hdr.z_flags & ACE_TYPE_FLAGS;
		} else {
			/* Overrun avoidance */
			if (ptr + sizeof (ace_t) > end) {
				break;
			}
			acep = (ace_t *)ptr;
			acep->a_access_mask = BSWAP_32(acep->a_access_mask);
			acep->a_flags = BSWAP_16(acep->a_flags);
			ace_type = acep->a_type = BSWAP_16(acep->a_type);
			acep->a_who = BSWAP_32(acep->a_who);
			entry_type = acep->a_flags & ACE_TYPE_FLAGS;
		}
		switch (entry_type) {
		case ACE_OWNER:
		case ACE_EVERYONE:
		case (ACE_IDENTIFIER_GROUP | ACE_GROUP):
			entry_size = zfs_layout ?
			    sizeof (zfs_ace_hdr_t) : sizeof (ace_t);
			break;
		case ACE_IDENTIFIER_GROUP:
		default:
			/* Overrun avoidance */
			if (zfs_layout) {
				if (ptr + sizeof (zfs_ace_t) <= end) {
					zacep->z_fuid = BSWAP_64(zacep->z_fuid);
				} else {
					entry_size = sizeof (zfs_ace_t);
					break;
				}
			}
			switch (ace_type) {
			case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
			case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
			case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
			case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
				entry_size = zfs_layout ?
				    sizeof (zfs_object_ace_t) :
				    sizeof (ace_object_t);
				break;
			default:
				entry_size = zfs_layout ? sizeof (zfs_ace_t) :
				    sizeof (ace_t);
				break;
			}
		}
		ptr = ptr + entry_size;
	}
}

void
zfs_oldacl_byteswap(void *buf, size_t size)
{
	/*
	 * Arggh, since we don't know how many ACEs are in
	 * the array, we have to swap the entire block
	 */
	zfs_oldace_byteswap((ace_t *)buf, size / sizeof (ace_t));
}

void
zfs_acl_byteswap(void *buf, size_t size)
{
	zfs_ace_byteswap(buf, size, B_TRUE);
}

void
zfs_znode_byteswap(void *buf, size_t size)
{
	znode_phys_t *zp = buf;

	ASSERT(size >= sizeof (znode_phys_t));

	zp->zp_crtime[0] = BSWAP_64(zp->zp_crtime[0]);
	zp->zp_crtime[1] = BSWAP_64(zp->zp_crtime[1]);
	zp->zp_atime[0] = BSWAP_64(zp->zp_atime[0]);
	zp->zp_atime[1] = BSWAP_64(zp->zp_atime[1]);
	zp->zp_mtime[0] = BSWAP_64(zp->zp_mtime[0]);
	zp->zp_mtime[1] = BSWAP_64(zp->zp_mtime[1]);
	zp->zp_ctime[0] = BSWAP_64(zp->zp_ctime[0]);
	zp->zp_ctime[1] = BSWAP_64(zp->zp_ctime[1]);
	zp->zp_gen = BSWAP_64(zp->zp_gen);
	zp->zp_mode = BSWAP_64(zp->zp_mode);
	zp->zp_size = BSWAP_64(zp->zp_size);
	zp->zp_parent = BSWAP_64(zp->zp_parent);
	zp->zp_links = BSWAP_64(zp->zp_links);
	zp->zp_xattr = BSWAP_64(zp->zp_xattr);
	zp->zp_rdev = BSWAP_64(zp->zp_rdev);
	zp->zp_flags = BSWAP_64(zp->zp_flags);
	zp->zp_uid = BSWAP_64(zp->zp_uid);
	zp->zp_gid = BSWAP_64(zp->zp_gid);
	zp->zp_zap = BSWAP_64(zp->zp_zap);
	zp->zp_pad[0] = BSWAP_64(zp->zp_pad[0]);
	zp->zp_pad[1] = BSWAP_64(zp->zp_pad[1]);
	zp->zp_pad[2] = BSWAP_64(zp->zp_pad[2]);

	zp->zp_acl.z_acl_extern_obj = BSWAP_64(zp->zp_acl.z_acl_extern_obj);
	zp->zp_acl.z_acl_size = BSWAP_32(zp->zp_acl.z_acl_size);
	zp->zp_acl.z_acl_version = BSWAP_16(zp->zp_acl.z_acl_version);
	zp->zp_acl.z_acl_count = BSWAP_16(zp->zp_acl.z_acl_count);
	if (zp->zp_acl.z_acl_version == ZFS_ACL_VERSION) {
		zfs_acl_byteswap((void *)&zp->zp_acl.z_ace_data[0],
		    ZFS_ACE_SPACE);
	} else {
		zfs_oldace_byteswap((ace_t *)&zp->zp_acl.z_ace_data[0],
		    ACE_SLOT_CNT);
	}
}

#if defined(_KERNEL)
EXPORT_SYMBOL(zfs_oldacl_byteswap);
EXPORT_SYMBOL(zfs_acl_byteswap);
EXPORT_SYMBOL(zfs_znode_byteswap);
#endif
Commit	Line	Data
34dc7c2f BB	1	/*
	2	* CDDL HEADER START
	3	*
	4	* The contents of this file are subject to the terms of the
	5	* Common Development and Distribution License (the "License").
	6	* You may not use this file except in compliance with the License.
	7	*
	8	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
1d3ba0bf	9	* or https://opensource.org/licenses/CDDL-1.0.
34dc7c2f BB	10	* See the License for the specific language governing permissions
	11	* and limitations under the License.
	12	*
	13	* When distributing Covered Code, include this CDDL HEADER in each
	14	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	15	* If applicable, add the following below this CDDL HEADER, with the
	16	* fields enclosed by brackets "[]" replaced with your own identifying
	17	* information: Portions Copyright [yyyy] [name of copyright owner]
	18	*
	19	* CDDL HEADER END
	20	*/
	21	/*
428870ff	22	* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
34dc7c2f BB	23	* Use is subject to license terms.
	24	*/
	25
34dc7c2f BB	26	#include <sys/zfs_context.h>
	27	#include <sys/vfs.h>
	28	#include <sys/fs/zfs.h>
	29	#include <sys/zfs_znode.h>
428870ff	30	#include <sys/zfs_sa.h>
34dc7c2f BB	31	#include <sys/zfs_acl.h>
34dc7c2f BB	32
65c7cc49 AS	33	#ifndef _KERNEL
	34	static
	35	#endif
34dc7c2f BB	36	void
	37	zfs_oldace_byteswap(ace_t *ace, int ace_cnt)
	38	{
ef70eff1	39	for (int i = 0; i != ace_cnt; i++, ace++) {
34dc7c2f BB	40	ace->a_who = BSWAP_32(ace->a_who);
	41	ace->a_access_mask = BSWAP_32(ace->a_access_mask);
	42	ace->a_flags = BSWAP_16(ace->a_flags);
	43	ace->a_type = BSWAP_16(ace->a_type);
	44	}
	45	}
	46
	47	/*
e1cfd73f	48	* swap ace_t and ace_object_t
34dc7c2f	49	*/
65c7cc49 AS	50	#ifndef _KERNEL
	51	static
	52	#endif
34dc7c2f BB	53	void
	54	zfs_ace_byteswap(void *buf, size_t size, boolean_t zfs_layout)
	55	{
	56	caddr_t end;
	57	caddr_t ptr;
d4ed6673	58	zfs_ace_t *zacep = NULL;
34dc7c2f BB	59	ace_t *acep;
	60	uint16_t entry_type;
	61	size_t entry_size;
	62	int ace_type;
	63
	64	end = (caddr_t)buf + size;
	65	ptr = buf;
	66
	67	while (ptr < end) {
	68	if (zfs_layout) {
fb5f0bc8 BB	69	/*
	70	* Avoid overrun. Embedded aces can have one
	71	* of several sizes. We don't know exactly
	72	* how many our present, only the size of the
	73	* buffer containing them. That size may be
	74	* larger than needed to hold the aces
	75	* present. As long as we do not do any
	76	* swapping beyond the end of our block we are
e1cfd73f	77	* okay. It is safe to swap any non-ace data
fb5f0bc8 BB	78	* within the block since it is just zeros.
	79	*/
	80	if (ptr + sizeof (zfs_ace_hdr_t) > end) {
	81	break;
	82	}
34dc7c2f BB	83	zacep = (zfs_ace_t *)ptr;
	84	zacep->z_hdr.z_access_mask =
	85	BSWAP_32(zacep->z_hdr.z_access_mask);
	86	zacep->z_hdr.z_flags = BSWAP_16(zacep->z_hdr.z_flags);
	87	ace_type = zacep->z_hdr.z_type =
	88	BSWAP_16(zacep->z_hdr.z_type);
	89	entry_type = zacep->z_hdr.z_flags & ACE_TYPE_FLAGS;
	90	} else {
fb5f0bc8 BB	91	/* Overrun avoidance */
	92	if (ptr + sizeof (ace_t) > end) {
	93	break;
	94	}
34dc7c2f BB	95	acep = (ace_t *)ptr;
	96	acep->a_access_mask = BSWAP_32(acep->a_access_mask);
	97	acep->a_flags = BSWAP_16(acep->a_flags);
	98	ace_type = acep->a_type = BSWAP_16(acep->a_type);
	99	acep->a_who = BSWAP_32(acep->a_who);
	100	entry_type = acep->a_flags & ACE_TYPE_FLAGS;
	101	}
	102	switch (entry_type) {
	103	case ACE_OWNER:
	104	case ACE_EVERYONE:
	105	case (ACE_IDENTIFIER_GROUP \| ACE_GROUP):
	106	entry_size = zfs_layout ?
	107	sizeof (zfs_ace_hdr_t) : sizeof (ace_t);
	108	break;
	109	case ACE_IDENTIFIER_GROUP:
	110	default:
fb5f0bc8	111	/* Overrun avoidance */
34dc7c2f	112	if (zfs_layout) {
fb5f0bc8 BB	113	if (ptr + sizeof (zfs_ace_t) <= end) {
	114	zacep->z_fuid = BSWAP_64(zacep->z_fuid);
	115	} else {
	116	entry_size = sizeof (zfs_ace_t);
	117	break;
	118	}
34dc7c2f BB	119	}
	120	switch (ace_type) {
	121	case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
	122	case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
	123	case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
	124	case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
	125	entry_size = zfs_layout ?
	126	sizeof (zfs_object_ace_t) :
	127	sizeof (ace_object_t);
	128	break;
	129	default:
	130	entry_size = zfs_layout ? sizeof (zfs_ace_t) :
	131	sizeof (ace_t);
	132	break;
	133	}
	134	}
	135	ptr = ptr + entry_size;
	136	}
	137	}
	138
34dc7c2f BB	139	void
	140	zfs_oldacl_byteswap(void *buf, size_t size)
	141	{
34dc7c2f BB	142	/*
	143	* Arggh, since we don't know how many ACEs are in
	144	* the array, we have to swap the entire block
	145	*/
ef70eff1	146	zfs_oldace_byteswap((ace_t *)buf, size / sizeof (ace_t));
34dc7c2f BB	147	}
34dc7c2f BB	148
34dc7c2f BB	149	void
	150	zfs_acl_byteswap(void *buf, size_t size)
	151	{
	152	zfs_ace_byteswap(buf, size, B_TRUE);
	153	}
	154
	155	void
	156	zfs_znode_byteswap(void *buf, size_t size)
	157	{
	158	znode_phys_t *zp = buf;
	159
	160	ASSERT(size >= sizeof (znode_phys_t));
	161
	162	zp->zp_crtime[0] = BSWAP_64(zp->zp_crtime[0]);
	163	zp->zp_crtime[1] = BSWAP_64(zp->zp_crtime[1]);
	164	zp->zp_atime[0] = BSWAP_64(zp->zp_atime[0]);
	165	zp->zp_atime[1] = BSWAP_64(zp->zp_atime[1]);
	166	zp->zp_mtime[0] = BSWAP_64(zp->zp_mtime[0]);
	167	zp->zp_mtime[1] = BSWAP_64(zp->zp_mtime[1]);
	168	zp->zp_ctime[0] = BSWAP_64(zp->zp_ctime[0]);
	169	zp->zp_ctime[1] = BSWAP_64(zp->zp_ctime[1]);
	170	zp->zp_gen = BSWAP_64(zp->zp_gen);
	171	zp->zp_mode = BSWAP_64(zp->zp_mode);
	172	zp->zp_size = BSWAP_64(zp->zp_size);
	173	zp->zp_parent = BSWAP_64(zp->zp_parent);
	174	zp->zp_links = BSWAP_64(zp->zp_links);
	175	zp->zp_xattr = BSWAP_64(zp->zp_xattr);
	176	zp->zp_rdev = BSWAP_64(zp->zp_rdev);
	177	zp->zp_flags = BSWAP_64(zp->zp_flags);
	178	zp->zp_uid = BSWAP_64(zp->zp_uid);
	179	zp->zp_gid = BSWAP_64(zp->zp_gid);
	180	zp->zp_zap = BSWAP_64(zp->zp_zap);
	181	zp->zp_pad[0] = BSWAP_64(zp->zp_pad[0]);
	182	zp->zp_pad[1] = BSWAP_64(zp->zp_pad[1]);
	183	zp->zp_pad[2] = BSWAP_64(zp->zp_pad[2]);
	184
	185	zp->zp_acl.z_acl_extern_obj = BSWAP_64(zp->zp_acl.z_acl_extern_obj);
	186	zp->zp_acl.z_acl_size = BSWAP_32(zp->zp_acl.z_acl_size);
	187	zp->zp_acl.z_acl_version = BSWAP_16(zp->zp_acl.z_acl_version);
	188	zp->zp_acl.z_acl_count = BSWAP_16(zp->zp_acl.z_acl_count);
	189	if (zp->zp_acl.z_acl_version == ZFS_ACL_VERSION) {
	190	zfs_acl_byteswap((void *)&zp->zp_acl.z_ace_data[0],
	191	ZFS_ACE_SPACE);
fb5f0bc8	192	} else {
34dc7c2f BB	193	zfs_oldace_byteswap((ace_t *)&zp->zp_acl.z_ace_data[0],
34dc7c2f BB	194	ACE_SLOT_CNT);
fb5f0bc8	195	}
34dc7c2f	196	}
c28b2279	197
93ce2b4c	198	#if defined(_KERNEL)
c28b2279 BB	199	EXPORT_SYMBOL(zfs_oldacl_byteswap);
	200	EXPORT_SYMBOL(zfs_acl_byteswap);
	201	EXPORT_SYMBOL(zfs_znode_byteswap);
	202	#endif