diff options
Diffstat (limited to 'uts/common/fs/zfs/zfs_byteswap.c')
| -rw-r--r-- | uts/common/fs/zfs/zfs_byteswap.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/zfs_byteswap.c b/uts/common/fs/zfs/zfs_byteswap.c new file mode 100644 index 000000000000..acf632bdbeff --- /dev/null +++ b/uts/common/fs/zfs/zfs_byteswap.c @@ -0,0 +1,199 @@ +/* + * 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 http://www.opensolaris.org/os/licensing. + * 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> + +void +zfs_oldace_byteswap(ace_t *ace, int ace_cnt) +{ + int i; + + for (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_oject_t + */ +void +zfs_ace_byteswap(void *buf, size_t size, boolean_t zfs_layout) +{ + caddr_t end; + caddr_t ptr; + zfs_ace_t *zacep; + 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 it 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; + } +} + +/* ARGSUSED */ +void +zfs_oldacl_byteswap(void *buf, size_t size) +{ + int cnt; + + /* + * Arggh, since we don't know how many ACEs are in + * the array, we have to swap the entire block + */ + + cnt = size / sizeof (ace_t); + + zfs_oldace_byteswap((ace_t *)buf, cnt); +} + +/* ARGSUSED */ +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); + } +} |