ext2fs_xattr.c revision 1.4.18.2
1 1.4.18.2 jdolecek /* $NetBSD: ext2fs_xattr.c,v 1.4.18.2 2017/12/03 11:39:21 jdolecek Exp $ */ 2 1.4.18.2 jdolecek 3 1.4.18.2 jdolecek /*- 4 1.4.18.2 jdolecek * Copyright (c) 2016 The NetBSD Foundation, Inc. 5 1.4.18.2 jdolecek * All rights reserved. 6 1.4.18.2 jdolecek * 7 1.4.18.2 jdolecek * This code is derived from software contributed to The NetBSD Foundation 8 1.4.18.2 jdolecek * by Jaromir Dolecek. 9 1.4.18.2 jdolecek * 10 1.4.18.2 jdolecek * Redistribution and use in source and binary forms, with or without 11 1.4.18.2 jdolecek * modification, are permitted provided that the following conditions 12 1.4.18.2 jdolecek * are met: 13 1.4.18.2 jdolecek * 1. Redistributions of source code must retain the above copyright 14 1.4.18.2 jdolecek * notice, this list of conditions and the following disclaimer. 15 1.4.18.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 16 1.4.18.2 jdolecek * notice, this list of conditions and the following disclaimer in the 17 1.4.18.2 jdolecek * documentation and/or other materials provided with the distribution. 18 1.4.18.2 jdolecek * 19 1.4.18.2 jdolecek * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.4.18.2 jdolecek * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.4.18.2 jdolecek * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.4.18.2 jdolecek * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.4.18.2 jdolecek * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.4.18.2 jdolecek * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.4.18.2 jdolecek * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.4.18.2 jdolecek * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.4.18.2 jdolecek * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.4.18.2 jdolecek * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.4.18.2 jdolecek * POSSIBILITY OF SUCH DAMAGE. 30 1.4.18.2 jdolecek */ 31 1.4.18.2 jdolecek 32 1.4.18.2 jdolecek #include <sys/cdefs.h> 33 1.4.18.2 jdolecek __KERNEL_RCSID(0, "$NetBSD: ext2fs_xattr.c,v 1.4.18.2 2017/12/03 11:39:21 jdolecek Exp $"); 34 1.4.18.2 jdolecek 35 1.4.18.2 jdolecek #include <sys/param.h> 36 1.4.18.2 jdolecek #include <sys/systm.h> 37 1.4.18.2 jdolecek #include <sys/mount.h> 38 1.4.18.2 jdolecek #include <sys/proc.h> 39 1.4.18.2 jdolecek #include <sys/file.h> 40 1.4.18.2 jdolecek #include <sys/buf.h> 41 1.4.18.2 jdolecek #include <sys/vnode.h> 42 1.4.18.2 jdolecek #include <sys/kernel.h> 43 1.4.18.2 jdolecek #include <sys/kmem.h> 44 1.4.18.2 jdolecek #include <sys/trace.h> 45 1.4.18.2 jdolecek #include <sys/resourcevar.h> 46 1.4.18.2 jdolecek #include <sys/kauth.h> 47 1.4.18.2 jdolecek #include <sys/extattr.h> 48 1.4.18.2 jdolecek 49 1.4.18.2 jdolecek #include <ufs/ufs/inode.h> 50 1.4.18.2 jdolecek #include <ufs/ufs/ufsmount.h> 51 1.4.18.2 jdolecek #include <ufs/ufs/ufs_extern.h> 52 1.4.18.2 jdolecek 53 1.4.18.2 jdolecek #include <ufs/ext2fs/ext2fs.h> 54 1.4.18.2 jdolecek #include <ufs/ext2fs/ext2fs_extern.h> 55 1.4.18.2 jdolecek #include <ufs/ext2fs/ext2fs_xattr.h> 56 1.4.18.2 jdolecek 57 1.4.18.2 jdolecek static const char * const xattr_prefix_index[] = { 58 1.4.18.2 jdolecek "", 59 1.4.18.2 jdolecek "user.", 60 1.4.18.2 jdolecek "system.posix_acl_access", 61 1.4.18.2 jdolecek "system.posix_acl_default", 62 1.4.18.2 jdolecek "trusted.", 63 1.4.18.2 jdolecek "", /* unused */ 64 1.4.18.2 jdolecek "security", 65 1.4.18.2 jdolecek "system.", 66 1.4.18.2 jdolecek "system.richacl", 67 1.4.18.2 jdolecek "c", 68 1.4.18.2 jdolecek }; 69 1.4.18.2 jdolecek 70 1.4.18.2 jdolecek static int 71 1.4.18.2 jdolecek ext2fs_find_xattr(struct ext2fs_xattr_entry *e, uint8_t *start, uint8_t *end, 72 1.4.18.2 jdolecek int attrnamespace, struct uio *uio, size_t *size, uint8_t name_index, 73 1.4.18.2 jdolecek const char *name) 74 1.4.18.2 jdolecek { 75 1.4.18.2 jdolecek uint8_t *value; 76 1.4.18.2 jdolecek int error; 77 1.4.18.2 jdolecek size_t value_offs, value_len, len, old_len; 78 1.4.18.2 jdolecek 79 1.4.18.2 jdolecek /* 80 1.4.18.2 jdolecek * Individual entries follow the header. Each is aligned on 4-byte 81 1.4.18.2 jdolecek * boundary. 82 1.4.18.2 jdolecek */ 83 1.4.18.2 jdolecek for(; !EXT2FS_XATTR_IS_LAST_ENTRY(e, end); e = EXT2FS_XATTR_NEXT(e)) { 84 1.4.18.2 jdolecek /* 85 1.4.18.2 jdolecek * Only EXT2FS_XATTR_PREFIX_USER is USER, anything else 86 1.4.18.2 jdolecek * is considered SYSTEM. 87 1.4.18.2 jdolecek */ 88 1.4.18.2 jdolecek if ((attrnamespace == EXTATTR_NAMESPACE_USER 89 1.4.18.2 jdolecek && e->e_name_index != EXT2FS_XATTR_PREFIX_USER) || 90 1.4.18.2 jdolecek (attrnamespace == EXTATTR_NAMESPACE_SYSTEM 91 1.4.18.2 jdolecek && e->e_name_index == EXT2FS_XATTR_PREFIX_USER)) { 92 1.4.18.2 jdolecek continue; 93 1.4.18.2 jdolecek } 94 1.4.18.2 jdolecek 95 1.4.18.2 jdolecek if (e->e_name_index != name_index || 96 1.4.18.2 jdolecek e->e_name_len != strlen(name) || 97 1.4.18.2 jdolecek strncmp(e->e_name, name, e->e_name_len) != 0) 98 1.4.18.2 jdolecek continue; 99 1.4.18.2 jdolecek 100 1.4.18.2 jdolecek value_offs = fs2h32(e->e_value_offs); 101 1.4.18.2 jdolecek value_len = fs2h32(e->e_value_size); 102 1.4.18.2 jdolecek value = &start[value_offs]; 103 1.4.18.2 jdolecek 104 1.4.18.2 jdolecek /* make sure the value offset are sane */ 105 1.4.18.2 jdolecek if (&value[value_len] > end) 106 1.4.18.2 jdolecek return EINVAL; 107 1.4.18.2 jdolecek 108 1.4.18.2 jdolecek if (uio != NULL) { 109 1.4.18.2 jdolecek /* 110 1.4.18.2 jdolecek * Figure out maximum to transfer -- use buffer size 111 1.4.18.2 jdolecek * and local data limit. 112 1.4.18.2 jdolecek */ 113 1.4.18.2 jdolecek len = MIN(uio->uio_resid, value_len); 114 1.4.18.2 jdolecek old_len = uio->uio_resid; 115 1.4.18.2 jdolecek uio->uio_resid = len; 116 1.4.18.2 jdolecek 117 1.4.18.2 jdolecek uio->uio_resid = old_len - (len - uio->uio_resid); 118 1.4.18.2 jdolecek 119 1.4.18.2 jdolecek error = uiomove(value, value_len, uio); 120 1.4.18.2 jdolecek if (error) 121 1.4.18.2 jdolecek return error; 122 1.4.18.2 jdolecek } 123 1.4.18.2 jdolecek 124 1.4.18.2 jdolecek /* full data size */ 125 1.4.18.2 jdolecek *size += value_len; 126 1.4.18.2 jdolecek 127 1.4.18.2 jdolecek goto found; 128 1.4.18.2 jdolecek } 129 1.4.18.2 jdolecek 130 1.4.18.2 jdolecek /* requested attribute not found */ 131 1.4.18.2 jdolecek return ENODATA; 132 1.4.18.2 jdolecek 133 1.4.18.2 jdolecek found: 134 1.4.18.2 jdolecek return 0; 135 1.4.18.2 jdolecek } 136 1.4.18.2 jdolecek 137 1.4.18.2 jdolecek static int 138 1.4.18.2 jdolecek ext2fs_get_inode_xattr(struct inode *ip, int attrnamespace, struct uio *uio, 139 1.4.18.2 jdolecek size_t *size, uint8_t name_index, const char *name) 140 1.4.18.2 jdolecek { 141 1.4.18.2 jdolecek struct ext2fs_dinode *di = ip->i_din.e2fs_din; 142 1.4.18.2 jdolecek struct ext2fs_xattr_ibody_header *h; 143 1.4.18.2 jdolecek uint8_t *start, *end; 144 1.4.18.2 jdolecek 145 1.4.18.2 jdolecek start = &((uint8_t *)di)[EXT2_REV0_DINODE_SIZE + di->e2di_extra_isize]; 146 1.4.18.2 jdolecek h = (struct ext2fs_xattr_ibody_header *)start; 147 1.4.18.2 jdolecek end = &((uint8_t *)di)[EXT2_DINODE_SIZE(ip->i_e2fs)]; 148 1.4.18.2 jdolecek 149 1.4.18.2 jdolecek if (end <= start || fs2h32(h->h_magic) != EXT2FS_XATTR_MAGIC) 150 1.4.18.2 jdolecek return ENODATA; 151 1.4.18.2 jdolecek 152 1.4.18.2 jdolecek return ext2fs_find_xattr(EXT2FS_XATTR_IFIRST(h), start, end, 153 1.4.18.2 jdolecek attrnamespace, uio, size, name_index, name); 154 1.4.18.2 jdolecek } 155 1.4.18.2 jdolecek 156 1.4.18.2 jdolecek static int 157 1.4.18.2 jdolecek ext2fs_get_block_xattr(struct inode *ip, int attrnamespace, struct uio *uio, 158 1.4.18.2 jdolecek size_t *size, uint8_t name_index, const char *name) 159 1.4.18.2 jdolecek { 160 1.4.18.2 jdolecek struct ext2fs_dinode *di = ip->i_din.e2fs_din; 161 1.4.18.2 jdolecek uint8_t *start, *end; 162 1.4.18.2 jdolecek struct ext2fs_xattr_header *h; 163 1.4.18.2 jdolecek int error = 0; 164 1.4.18.2 jdolecek struct buf *bp = NULL; 165 1.4.18.2 jdolecek daddr_t xblk; 166 1.4.18.2 jdolecek 167 1.4.18.2 jdolecek xblk = di->e2di_facl; 168 1.4.18.2 jdolecek if (EXT2F_HAS_INCOMPAT_FEATURE(ip->i_e2fs, EXT2F_INCOMPAT_64BIT)) 169 1.4.18.2 jdolecek xblk |= (((daddr_t)di->e2di_facl_high) << 32); 170 1.4.18.2 jdolecek 171 1.4.18.2 jdolecek /* don't do anything if no attr block was allocated */ 172 1.4.18.2 jdolecek if (xblk == 0) 173 1.4.18.2 jdolecek return 0; 174 1.4.18.2 jdolecek 175 1.4.18.2 jdolecek error = bread(ip->i_devvp, fsbtodb(ip->i_e2fs, xblk), 176 1.4.18.2 jdolecek (int)ip->i_e2fs->e2fs_bsize, 0, &bp); 177 1.4.18.2 jdolecek if (error) 178 1.4.18.2 jdolecek goto out; 179 1.4.18.2 jdolecek 180 1.4.18.2 jdolecek start = (uint8_t *)bp->b_data; 181 1.4.18.2 jdolecek h = (struct ext2fs_xattr_header *)start; 182 1.4.18.2 jdolecek end = &((uint8_t *)bp->b_data)[bp->b_bcount]; 183 1.4.18.2 jdolecek 184 1.4.18.2 jdolecek if (end <= start || fs2h32(h->h_magic) != EXT2FS_XATTR_MAGIC) 185 1.4.18.2 jdolecek goto out; 186 1.4.18.2 jdolecek 187 1.4.18.2 jdolecek error = ext2fs_find_xattr(EXT2FS_XATTR_BFIRST(h), start, end, 188 1.4.18.2 jdolecek attrnamespace, uio, size, name_index, name); 189 1.4.18.2 jdolecek 190 1.4.18.2 jdolecek out: 191 1.4.18.2 jdolecek if (bp) 192 1.4.18.2 jdolecek brelse(bp, 0); 193 1.4.18.2 jdolecek return error; 194 1.4.18.2 jdolecek } 195 1.4.18.2 jdolecek int 196 1.4.18.2 jdolecek ext2fs_getextattr(void *v) 197 1.4.18.2 jdolecek { 198 1.4.18.2 jdolecek struct vop_getextattr_args /* { 199 1.4.18.2 jdolecek const struct vnodeop_desc *a_desc; 200 1.4.18.2 jdolecek struct vnode *a_vp; 201 1.4.18.2 jdolecek int a_attrnamespace; 202 1.4.18.2 jdolecek const char *a_name; 203 1.4.18.2 jdolecek struct uio *a_uio; 204 1.4.18.2 jdolecek size_t *a_size; 205 1.4.18.2 jdolecek kauth_cred_t a_cred; 206 1.4.18.2 jdolecek } */ *ap = v; 207 1.4.18.2 jdolecek struct inode *ip = VTOI(ap->a_vp); 208 1.4.18.2 jdolecek char namebuf[EXT2FS_XATTR_NAME_LEN_MAX + 1]; 209 1.4.18.2 jdolecek int error; 210 1.4.18.2 jdolecek const char *prefix, *name; 211 1.4.18.2 jdolecek uint8_t name_index; 212 1.4.18.2 jdolecek size_t name_match, valuesize = 0; 213 1.4.18.2 jdolecek 214 1.4.18.2 jdolecek if (ap->a_attrnamespace == EXTATTR_NAMESPACE_USER) 215 1.4.18.2 jdolecek prefix = xattr_prefix_index[EXT2FS_XATTR_PREFIX_USER]; 216 1.4.18.2 jdolecek else 217 1.4.18.2 jdolecek prefix = xattr_prefix_index[EXT2FS_XATTR_PREFIX_SYSTEM]; 218 1.4.18.2 jdolecek snprintf(namebuf, sizeof(namebuf), "%s%s", prefix, ap->a_name); 219 1.4.18.2 jdolecek 220 1.4.18.2 jdolecek error = extattr_check_cred(ap->a_vp, namebuf, ap->a_cred, VREAD); 221 1.4.18.2 jdolecek if (error) 222 1.4.18.2 jdolecek return error; 223 1.4.18.2 jdolecek 224 1.4.18.2 jdolecek /* 225 1.4.18.2 jdolecek * Allow only offsets of zero to encourage the read/replace 226 1.4.18.2 jdolecek * extended attribute semantic. Otherwise we can't guarantee 227 1.4.18.2 jdolecek * atomicity, as we don't provide locks for extended attributes. 228 1.4.18.2 jdolecek */ 229 1.4.18.2 jdolecek if (ap->a_uio != NULL && ap->a_uio->uio_offset != 0) 230 1.4.18.2 jdolecek return ENXIO; 231 1.4.18.2 jdolecek 232 1.4.18.2 jdolecek /* figure out the name index */ 233 1.4.18.2 jdolecek name = ap->a_name; 234 1.4.18.2 jdolecek name_index = 0; 235 1.4.18.2 jdolecek name_match = 0; 236 1.4.18.2 jdolecek for(size_t i = 0; i < __arraycount(xattr_prefix_index); i++) { 237 1.4.18.2 jdolecek prefix = xattr_prefix_index[i]; 238 1.4.18.2 jdolecek size_t l = strlen(prefix); 239 1.4.18.2 jdolecek if (l > 0 && strncmp(ap->a_name, prefix, l) == 0 && 240 1.4.18.2 jdolecek name_match < l) { 241 1.4.18.2 jdolecek name = &ap->a_name[l]; 242 1.4.18.2 jdolecek name_index = i; 243 1.4.18.2 jdolecek name_match = l; 244 1.4.18.2 jdolecek continue; 245 1.4.18.2 jdolecek } 246 1.4.18.2 jdolecek } 247 1.4.18.2 jdolecek 248 1.4.18.2 jdolecek /* fetch the xattr */ 249 1.4.18.2 jdolecek error = ext2fs_get_inode_xattr(ip, ap->a_attrnamespace, ap->a_uio, 250 1.4.18.2 jdolecek &valuesize, name_index, name); 251 1.4.18.2 jdolecek if (error == ENODATA) { 252 1.4.18.2 jdolecek /* not found in inode, try facl */ 253 1.4.18.2 jdolecek error = ext2fs_get_block_xattr(ip, ap->a_attrnamespace, 254 1.4.18.2 jdolecek ap->a_uio, &valuesize, name_index, name); 255 1.4.18.2 jdolecek } 256 1.4.18.2 jdolecek 257 1.4.18.2 jdolecek if (ap->a_size != NULL) 258 1.4.18.2 jdolecek *ap->a_size = valuesize; 259 1.4.18.2 jdolecek 260 1.4.18.2 jdolecek return error; 261 1.4.18.2 jdolecek } 262 1.4.18.2 jdolecek 263 1.4.18.2 jdolecek int 264 1.4.18.2 jdolecek ext2fs_setextattr(void *v) 265 1.4.18.2 jdolecek { 266 1.4.18.2 jdolecek #if 0 267 1.4.18.2 jdolecek struct vop_setextattr_args /* { 268 1.4.18.2 jdolecek const struct vnodeop_desc *a_desc; 269 1.4.18.2 jdolecek struct vnode *a_vp; 270 1.4.18.2 jdolecek int a_attrnamespace; 271 1.4.18.2 jdolecek const char *a_name; 272 1.4.18.2 jdolecek struct uio *a_uio; 273 1.4.18.2 jdolecek kauth_cred_t a_cred; 274 1.4.18.2 jdolecek } */ *ap = v; 275 1.4.18.2 jdolecek 276 1.4.18.2 jdolecek /* XXX set EXT2F_COMPAT_EXTATTR in superblock after successful set */ 277 1.4.18.2 jdolecek #endif 278 1.4.18.2 jdolecek 279 1.4.18.2 jdolecek /* XXX Not implemented */ 280 1.4.18.2 jdolecek return EOPNOTSUPP; 281 1.4.18.2 jdolecek } 282 1.4.18.2 jdolecek 283 1.4.18.2 jdolecek static int 284 1.4.18.2 jdolecek ext2fs_list_xattr(struct ext2fs_xattr_entry *e, uint8_t *end, 285 1.4.18.2 jdolecek int attrnamespace, int flags, struct uio *uio, size_t *size) 286 1.4.18.2 jdolecek { 287 1.4.18.2 jdolecek char name[EXT2FS_XATTR_NAME_LEN_MAX + 1]; 288 1.4.18.2 jdolecek uint8_t len; 289 1.4.18.2 jdolecek int error; 290 1.4.18.2 jdolecek const char *prefix; 291 1.4.18.2 jdolecek 292 1.4.18.2 jdolecek /* 293 1.4.18.2 jdolecek * Individual entries follow the header. Each is aligned on 4-byte 294 1.4.18.2 jdolecek * boundary. 295 1.4.18.2 jdolecek */ 296 1.4.18.2 jdolecek for(; !EXT2FS_XATTR_IS_LAST_ENTRY(e, end); e = EXT2FS_XATTR_NEXT(e)) { 297 1.4.18.2 jdolecek /* 298 1.4.18.2 jdolecek * Only EXT2FS_XATTR_PREFIX_USER is USER, anything else 299 1.4.18.2 jdolecek * is considered SYSTEM. 300 1.4.18.2 jdolecek */ 301 1.4.18.2 jdolecek if ((attrnamespace == EXTATTR_NAMESPACE_USER 302 1.4.18.2 jdolecek && e->e_name_index != EXT2FS_XATTR_PREFIX_USER) || 303 1.4.18.2 jdolecek (attrnamespace == EXTATTR_NAMESPACE_SYSTEM 304 1.4.18.2 jdolecek && e->e_name_index == EXT2FS_XATTR_PREFIX_USER)) { 305 1.4.18.2 jdolecek continue; 306 1.4.18.2 jdolecek } 307 1.4.18.2 jdolecek 308 1.4.18.2 jdolecek if (e->e_name_index < __arraycount(xattr_prefix_index)) 309 1.4.18.2 jdolecek prefix = xattr_prefix_index[e->e_name_index]; 310 1.4.18.2 jdolecek else 311 1.4.18.2 jdolecek prefix = ""; 312 1.4.18.2 jdolecek 313 1.4.18.2 jdolecek len = snprintf(name, sizeof(name), "%s%.*s", 314 1.4.18.2 jdolecek prefix, 315 1.4.18.2 jdolecek e->e_name_len, e->e_name); 316 1.4.18.2 jdolecek 317 1.4.18.2 jdolecek if (uio != NULL) { 318 1.4.18.2 jdolecek if (flags & EXTATTR_LIST_LENPREFIX) { 319 1.4.18.2 jdolecek /* write name length */ 320 1.4.18.2 jdolecek error = uiomove(&len, sizeof(uint8_t), uio); 321 1.4.18.2 jdolecek if (error) 322 1.4.18.2 jdolecek return error; 323 1.4.18.2 jdolecek } else { 324 1.4.18.2 jdolecek /* include trailing NUL */ 325 1.4.18.2 jdolecek len++; 326 1.4.18.2 jdolecek } 327 1.4.18.2 jdolecek 328 1.4.18.2 jdolecek error = uiomove(name, len, uio); 329 1.4.18.2 jdolecek if (error) 330 1.4.18.2 jdolecek return error; 331 1.4.18.2 jdolecek 332 1.4.18.2 jdolecek *size += len; 333 1.4.18.2 jdolecek } 334 1.4.18.2 jdolecek } 335 1.4.18.2 jdolecek 336 1.4.18.2 jdolecek return 0; 337 1.4.18.2 jdolecek } 338 1.4.18.2 jdolecek 339 1.4.18.2 jdolecek static int 340 1.4.18.2 jdolecek ext2fs_list_inode_xattr(struct inode *ip, int attrnamespace, int flags, 341 1.4.18.2 jdolecek struct uio *uio, size_t *size) 342 1.4.18.2 jdolecek { 343 1.4.18.2 jdolecek struct ext2fs_dinode *di = ip->i_din.e2fs_din; 344 1.4.18.2 jdolecek void *start, *end; 345 1.4.18.2 jdolecek struct ext2fs_xattr_ibody_header *h; 346 1.4.18.2 jdolecek 347 1.4.18.2 jdolecek start = &((uint8_t *)di)[EXT2_REV0_DINODE_SIZE + di->e2di_extra_isize]; 348 1.4.18.2 jdolecek h = start; 349 1.4.18.2 jdolecek end = &((uint8_t *)di)[EXT2_DINODE_SIZE(ip->i_e2fs)]; 350 1.4.18.2 jdolecek 351 1.4.18.2 jdolecek if (end <= start || fs2h32(h->h_magic) != EXT2FS_XATTR_MAGIC) 352 1.4.18.2 jdolecek return 0; 353 1.4.18.2 jdolecek 354 1.4.18.2 jdolecek return ext2fs_list_xattr(EXT2FS_XATTR_IFIRST(h), end, attrnamespace, 355 1.4.18.2 jdolecek flags, uio, size); 356 1.4.18.2 jdolecek } 357 1.4.18.2 jdolecek 358 1.4.18.2 jdolecek static int 359 1.4.18.2 jdolecek ext2fs_list_block_xattr(struct inode *ip, int attrnamespace, int flags, 360 1.4.18.2 jdolecek struct uio *uio, size_t *size) 361 1.4.18.2 jdolecek { 362 1.4.18.2 jdolecek struct ext2fs_dinode *di = ip->i_din.e2fs_din; 363 1.4.18.2 jdolecek void *end; 364 1.4.18.2 jdolecek struct ext2fs_xattr_header *h; 365 1.4.18.2 jdolecek int error = 0; 366 1.4.18.2 jdolecek struct buf *bp = NULL; 367 1.4.18.2 jdolecek daddr_t xblk; 368 1.4.18.2 jdolecek 369 1.4.18.2 jdolecek xblk = di->e2di_facl; 370 1.4.18.2 jdolecek if (EXT2F_HAS_INCOMPAT_FEATURE(ip->i_e2fs, EXT2F_INCOMPAT_64BIT)) 371 1.4.18.2 jdolecek xblk |= (((daddr_t)di->e2di_facl_high) << 32); 372 1.4.18.2 jdolecek 373 1.4.18.2 jdolecek /* don't do anything if no attr block was allocated */ 374 1.4.18.2 jdolecek if (xblk == 0) 375 1.4.18.2 jdolecek return 0; 376 1.4.18.2 jdolecek 377 1.4.18.2 jdolecek error = bread(ip->i_devvp, fsbtodb(ip->i_e2fs, xblk), 378 1.4.18.2 jdolecek (int)ip->i_e2fs->e2fs_bsize, 0, &bp); 379 1.4.18.2 jdolecek if (error) 380 1.4.18.2 jdolecek goto out; 381 1.4.18.2 jdolecek 382 1.4.18.2 jdolecek h = (struct ext2fs_xattr_header *)bp->b_data; 383 1.4.18.2 jdolecek end = &((uint8_t *)bp->b_data)[bp->b_bcount]; 384 1.4.18.2 jdolecek 385 1.4.18.2 jdolecek if (end <= (void *)h || fs2h32(h->h_magic) != EXT2FS_XATTR_MAGIC) 386 1.4.18.2 jdolecek goto out; 387 1.4.18.2 jdolecek 388 1.4.18.2 jdolecek error = ext2fs_list_xattr(EXT2FS_XATTR_BFIRST(h), end, attrnamespace, 389 1.4.18.2 jdolecek flags, uio, size); 390 1.4.18.2 jdolecek 391 1.4.18.2 jdolecek out: 392 1.4.18.2 jdolecek if (bp) 393 1.4.18.2 jdolecek brelse(bp, 0); 394 1.4.18.2 jdolecek return error; 395 1.4.18.2 jdolecek } 396 1.4.18.2 jdolecek 397 1.4.18.2 jdolecek int 398 1.4.18.2 jdolecek ext2fs_listextattr(void *v) 399 1.4.18.2 jdolecek { 400 1.4.18.2 jdolecek struct vop_listextattr_args /* { 401 1.4.18.2 jdolecek const struct vnodeop_desc *a_desc; 402 1.4.18.2 jdolecek struct vnode *a_vp; 403 1.4.18.2 jdolecek int a_attrnamespace; 404 1.4.18.2 jdolecek struct uio *a_uio; 405 1.4.18.2 jdolecek size_t *a_size; 406 1.4.18.2 jdolecek int a_flag; 407 1.4.18.2 jdolecek kauth_cred_t a_cred; 408 1.4.18.2 jdolecek } */ *ap = v; 409 1.4.18.2 jdolecek struct inode *ip = VTOI(ap->a_vp); 410 1.4.18.2 jdolecek int error; 411 1.4.18.2 jdolecek const char *prefix; 412 1.4.18.2 jdolecek size_t listsize = 0; 413 1.4.18.2 jdolecek 414 1.4.18.2 jdolecek if (!EXT2F_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXTATTR)) { 415 1.4.18.2 jdolecek /* no EA on the filesystem */ 416 1.4.18.2 jdolecek goto out; 417 1.4.18.2 jdolecek } 418 1.4.18.2 jdolecek 419 1.4.18.2 jdolecek /* 420 1.4.18.2 jdolecek * XXX: We can move this inside the loop and iterate on individual 421 1.4.18.2 jdolecek * attributes. 422 1.4.18.2 jdolecek */ 423 1.4.18.2 jdolecek if (ap->a_attrnamespace == EXTATTR_NAMESPACE_USER) 424 1.4.18.2 jdolecek prefix = xattr_prefix_index[EXT2FS_XATTR_PREFIX_USER]; 425 1.4.18.2 jdolecek else 426 1.4.18.2 jdolecek prefix = xattr_prefix_index[EXT2FS_XATTR_PREFIX_SYSTEM]; 427 1.4.18.2 jdolecek error = extattr_check_cred(ap->a_vp, prefix, ap->a_cred, VREAD); 428 1.4.18.2 jdolecek if (error) 429 1.4.18.2 jdolecek return error; 430 1.4.18.2 jdolecek 431 1.4.18.2 jdolecek /* 432 1.4.18.2 jdolecek * Allow only offsets of zero to encourage the read/replace 433 1.4.18.2 jdolecek * extended attribute semantic. Otherwise we can't guarantee 434 1.4.18.2 jdolecek * atomicity, as we don't provide locks for extended attributes. 435 1.4.18.2 jdolecek * XXX revisit - vnode lock enough? 436 1.4.18.2 jdolecek */ 437 1.4.18.2 jdolecek if (ap->a_uio != NULL && ap->a_uio->uio_offset != 0) 438 1.4.18.2 jdolecek return ENXIO; 439 1.4.18.2 jdolecek 440 1.4.18.2 jdolecek /* fetch inode xattrs */ 441 1.4.18.2 jdolecek error = ext2fs_list_inode_xattr(ip, ap->a_attrnamespace, ap->a_flag, 442 1.4.18.2 jdolecek ap->a_uio, &listsize); 443 1.4.18.2 jdolecek if (error) 444 1.4.18.2 jdolecek return error; 445 1.4.18.2 jdolecek 446 1.4.18.2 jdolecek error = ext2fs_list_block_xattr(ip, ap->a_attrnamespace, ap->a_flag, 447 1.4.18.2 jdolecek ap->a_uio, &listsize); 448 1.4.18.2 jdolecek if (error) 449 1.4.18.2 jdolecek return error; 450 1.4.18.2 jdolecek 451 1.4.18.2 jdolecek out: 452 1.4.18.2 jdolecek if (ap->a_size != NULL) 453 1.4.18.2 jdolecek *ap->a_size = listsize; 454 1.4.18.2 jdolecek 455 1.4.18.2 jdolecek return 0; 456 1.4.18.2 jdolecek } 457 1.4.18.2 jdolecek 458 1.4.18.2 jdolecek int 459 1.4.18.2 jdolecek ext2fs_deleteextattr(void *v) 460 1.4.18.2 jdolecek { 461 1.4.18.2 jdolecek #if 0 462 1.4.18.2 jdolecek struct vop_deleteextattr_args /* { 463 1.4.18.2 jdolecek const struct vnodeop_desc *a_desc; 464 1.4.18.2 jdolecek struct vnode *a_vp; 465 1.4.18.2 jdolecek int a_attrnamespace; 466 1.4.18.2 jdolecek const char *a_name; 467 1.4.18.2 jdolecek kauth_cred_t a_cred; 468 1.4.18.2 jdolecek } */ *ap = v; 469 1.4.18.2 jdolecek #endif 470 1.4.18.2 jdolecek 471 1.4.18.2 jdolecek /* XXX Not implemented */ 472 1.4.18.2 jdolecek return EOPNOTSUPP; 473 1.4.18.2 jdolecek } 474
Indexes created Sun Oct 19 02:09:48 GMT 2025