kernel/fs/zfs/zfs_byteswap.c

   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
   9  * or http://www.opensolaris.org/os/licensing.
  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 /*
  22  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <sys/zfs_context.h>
  27 #include <sys/vfs.h>
  28 #include <sys/fs/zfs.h>
  29 #include <sys/zfs_znode.h>
  30 #include <sys/zfs_sa.h>
  31 #include <sys/zfs_acl.h>
  32
  33 void
  34 zfs_oldace_byteswap(ace_t *ace, int ace_cnt)
  35 {
  36         int i;
  37
  38         for (i = 0; i != ace_cnt; i++, ace++) {
  39                 ace->a_who = BSWAP_32(ace->a_who);
  40                 ace->a_access_mask = BSWAP_32(ace->a_access_mask);
  41                 ace->a_flags = BSWAP_16(ace->a_flags);
  42                 ace->a_type = BSWAP_16(ace->a_type);
  43         }
  44 }
  45
  46 /*
  47  * swap ace_t and ace_oject_t
  48  */
  49 void
  50 zfs_ace_byteswap(void *buf, size_t size, boolean_t zfs_layout)
  51 {
  52         caddr_t end;
  53         caddr_t ptr;
  54         zfs_ace_t *zacep = NULL;
  55         ace_t *acep;
  56         uint16_t entry_type;
  57         size_t entry_size;
  58         int ace_type;
  59
  60         end = (caddr_t)buf + size;
  61         ptr = buf;
  62
  63         while (ptr < end) {
  64                 if (zfs_layout) {
  65                         /*
  66                          * Avoid overrun.  Embedded aces can have one
  67                          * of several sizes.  We don't know exactly
  68                          * how many our present, only the size of the
  69                          * buffer containing them.  That size may be
  70                          * larger than needed to hold the aces
  71                          * present.  As long as we do not do any
  72                          * swapping beyond the end of our block we are
  73                          * okay.  It it safe to swap any non-ace data
  74                          * within the block since it is just zeros.
  75                          */
  76                         if (ptr + sizeof (zfs_ace_hdr_t) > end) {
  77                                 break;
  78                         }
  79                         zacep = (zfs_ace_t *)ptr;
  80                         zacep->z_hdr.z_access_mask =
  81                             BSWAP_32(zacep->z_hdr.z_access_mask);
  82                         zacep->z_hdr.z_flags = BSWAP_16(zacep->z_hdr.z_flags);
  83                         ace_type = zacep->z_hdr.z_type =
  84                             BSWAP_16(zacep->z_hdr.z_type);
  85                         entry_type = zacep->z_hdr.z_flags & ACE_TYPE_FLAGS;
  86                 } else {
  87                         /* Overrun avoidance */
  88                         if (ptr + sizeof (ace_t) > end) {
  89                                 break;
  90                         }
  91                         acep = (ace_t *)ptr;
  92                         acep->a_access_mask = BSWAP_32(acep->a_access_mask);
  93                         acep->a_flags = BSWAP_16(acep->a_flags);
  94                         ace_type = acep->a_type = BSWAP_16(acep->a_type);
  95                         acep->a_who = BSWAP_32(acep->a_who);
  96                         entry_type = acep->a_flags & ACE_TYPE_FLAGS;
  97                 }
  98                 switch (entry_type) {
  99                 case ACE_OWNER:
 100                 case ACE_EVERYONE:
 101                 case (ACE_IDENTIFIER_GROUP | ACE_GROUP):
 102                         entry_size = zfs_layout ?
 103                             sizeof (zfs_ace_hdr_t) : sizeof (ace_t);
 104                         break;
 105                 case ACE_IDENTIFIER_GROUP:
 106                 default:
 107                         /* Overrun avoidance */
 108                         if (zfs_layout) {
 109                                 if (ptr + sizeof (zfs_ace_t) <= end) {
 110                                         zacep->z_fuid = BSWAP_64(zacep->z_fuid);
 111                                 } else {
 112                                         entry_size = sizeof (zfs_ace_t);
 113                                         break;
 114                                 }
 115                         }
 116                         switch (ace_type) {
 117                         case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
 118                         case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
 119                         case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
 120                         case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
 121                                 entry_size = zfs_layout ?
 122                                     sizeof (zfs_object_ace_t) :
 123                                     sizeof (ace_object_t);
 124                                 break;
 125                         default:
 126                                 entry_size = zfs_layout ? sizeof (zfs_ace_t) :
 127                                     sizeof (ace_t);
 128                                 break;
 129                         }
 130                 }
 131                 ptr = ptr + entry_size;
 132         }
 133 }
 134
 135 /* ARGSUSED */
 136 void
 137 zfs_oldacl_byteswap(void *buf, size_t size)
 138 {
 139         int cnt;
 140
 141         /*
 142          * Arggh, since we don't know how many ACEs are in
 143          * the array, we have to swap the entire block
 144          */
 145
 146         cnt = size / sizeof (ace_t);
 147
 148         zfs_oldace_byteswap((ace_t *)buf, cnt);
 149 }
 150
 151 /* ARGSUSED */
 152 void
 153 zfs_acl_byteswap(void *buf, size_t size)
 154 {
 155         zfs_ace_byteswap(buf, size, B_TRUE);
 156 }
 157
 158 void
 159 zfs_znode_byteswap(void *buf, size_t size)
 160 {
 161         znode_phys_t *zp = buf;
 162
 163         ASSERT(size >= sizeof (znode_phys_t));
 164
 165         zp->zp_crtime[0] = BSWAP_64(zp->zp_crtime[0]);
 166         zp->zp_crtime[1] = BSWAP_64(zp->zp_crtime[1]);
 167         zp->zp_atime[0] = BSWAP_64(zp->zp_atime[0]);
 168         zp->zp_atime[1] = BSWAP_64(zp->zp_atime[1]);
 169         zp->zp_mtime[0] = BSWAP_64(zp->zp_mtime[0]);
 170         zp->zp_mtime[1] = BSWAP_64(zp->zp_mtime[1]);
 171         zp->zp_ctime[0] = BSWAP_64(zp->zp_ctime[0]);
 172         zp->zp_ctime[1] = BSWAP_64(zp->zp_ctime[1]);
 173         zp->zp_gen = BSWAP_64(zp->zp_gen);
 174         zp->zp_mode = BSWAP_64(zp->zp_mode);
 175         zp->zp_size = BSWAP_64(zp->zp_size);
 176         zp->zp_parent = BSWAP_64(zp->zp_parent);
 177         zp->zp_links = BSWAP_64(zp->zp_links);
 178         zp->zp_xattr = BSWAP_64(zp->zp_xattr);
 179         zp->zp_rdev = BSWAP_64(zp->zp_rdev);
 180         zp->zp_flags = BSWAP_64(zp->zp_flags);
 181         zp->zp_uid = BSWAP_64(zp->zp_uid);
 182         zp->zp_gid = BSWAP_64(zp->zp_gid);
 183         zp->zp_zap = BSWAP_64(zp->zp_zap);
 184         zp->zp_pad[0] = BSWAP_64(zp->zp_pad[0]);
 185         zp->zp_pad[1] = BSWAP_64(zp->zp_pad[1]);
 186         zp->zp_pad[2] = BSWAP_64(zp->zp_pad[2]);
 187
 188         zp->zp_acl.z_acl_extern_obj = BSWAP_64(zp->zp_acl.z_acl_extern_obj);
 189         zp->zp_acl.z_acl_size = BSWAP_32(zp->zp_acl.z_acl_size);
 190         zp->zp_acl.z_acl_version = BSWAP_16(zp->zp_acl.z_acl_version);
 191         zp->zp_acl.z_acl_count = BSWAP_16(zp->zp_acl.z_acl_count);
 192         if (zp->zp_acl.z_acl_version == ZFS_ACL_VERSION) {
 193                 zfs_acl_byteswap((void *)&zp->zp_acl.z_ace_data[0],
 194                     ZFS_ACE_SPACE);
 195         } else {
 196                 zfs_oldace_byteswap((ace_t *)&zp->zp_acl.z_ace_data[0],
 197                     ACE_SLOT_CNT);
 198         }
 199 }