4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
31 * This file is part of Lustre, http://www.lustre.org/
32 * Lustre is a trademark of Sun Microsystems, Inc.
34 * lustre/mdd/mdd_permission.c
36 * Lustre Metadata Server (mdd) routines
38 * Author: fangyong@clusterfs.com
39 * Author: lsy@clusterfs.com
42 #define DEBUG_SUBSYSTEM S_MDS
44 #include <linux/module.h>
45 #ifdef HAVE_EXT4_LDISKFS
46 #include <ldiskfs/ldiskfs_jbd2.h>
48 #include <linux/jbd.h>
51 #include <obd_class.h>
52 #include <lustre_ver.h>
53 #include <obd_support.h>
54 #include <lprocfs_status.h>
56 #ifdef HAVE_EXT4_LDISKFS
57 #include <ldiskfs/ldiskfs.h>
59 #include <linux/ldiskfs_fs.h>
61 #include <lustre_mds.h>
62 #include <lustre/lustre_idl.h>
64 #include "mdd_internal.h"
66 #ifdef CONFIG_FS_POSIX_ACL
69 * Get default acl EA only.
70 * Hold read_lock for mdd_obj.
72 int mdd_def_acl_get(const struct lu_env *env, struct mdd_object *mdd_obj,
79 if (ma->ma_valid & MA_ACL_DEF)
82 buf = mdd_buf_get(env, ma->ma_acl, ma->ma_acl_size);
83 rc = mdo_xattr_get(env, mdd_obj, buf, XATTR_NAME_ACL_DEFAULT,
87 ma->ma_valid |= MA_ACL_DEF;
89 } else if ((rc == -EOPNOTSUPP) || (rc == -ENODATA)) {
96 * Hold write_lock for o.
98 int mdd_acl_chmod(const struct lu_env *env, struct mdd_object *o, __u32 mode,
99 struct thandle *handle)
102 posix_acl_xattr_header *head;
103 posix_acl_xattr_entry *entry;
109 buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
110 sizeof(mdd_env_info(env)->mti_xattr_buf));
112 rc = mdo_xattr_get(env, o, buf, XATTR_NAME_ACL_ACCESS, BYPASS_CAPA);
113 if ((rc == -EOPNOTSUPP) || (rc == -ENODATA))
119 head = (posix_acl_xattr_header *)(buf->lb_buf);
120 entry = head->a_entries;
121 entry_count = (buf->lb_len - sizeof(head->a_version)) /
122 sizeof(posix_acl_xattr_entry);
123 if (entry_count <= 0)
126 rc = lustre_posix_acl_chmod_masq(entry, mode, entry_count);
130 rc = mdo_xattr_set(env, o, buf, XATTR_NAME_ACL_ACCESS,
131 0, handle, BYPASS_CAPA);
136 * Hold write_lock for obj.
138 int __mdd_acl_init(const struct lu_env *env, struct mdd_object *obj,
139 struct lu_buf *buf, __u32 *mode, struct thandle *handle)
141 posix_acl_xattr_header *head;
142 posix_acl_xattr_entry *entry;
148 head = (posix_acl_xattr_header *)(buf->lb_buf);
149 entry = head->a_entries;
150 entry_count = (buf->lb_len - sizeof(head->a_version)) /
151 sizeof(posix_acl_xattr_entry);
152 if (entry_count <= 0)
155 if (S_ISDIR(*mode)) {
156 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_DEFAULT, 0,
157 handle, BYPASS_CAPA);
162 rc = lustre_posix_acl_create_masq(entry, mode, entry_count);
166 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_ACCESS, 0, handle,
173 * Hold read_lock for obj.
175 static int mdd_check_acl(const struct lu_env *env, struct mdd_object *obj,
176 struct lu_attr *la, int mask)
178 #ifdef CONFIG_FS_POSIX_ACL
179 struct md_ucred *uc = md_ucred(env);
180 posix_acl_xattr_header *head;
181 posix_acl_xattr_entry *entry;
187 buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
188 sizeof(mdd_env_info(env)->mti_xattr_buf));
189 rc = mdo_xattr_get(env, obj, buf, XATTR_NAME_ACL_ACCESS,
190 mdd_object_capa(env, obj));
192 RETURN(rc ? : -EACCES);
195 head = (posix_acl_xattr_header *)(buf->lb_buf);
196 entry = head->a_entries;
197 entry_count = (buf->lb_len - sizeof(head->a_version)) /
198 sizeof(posix_acl_xattr_entry);
200 rc = lustre_posix_acl_permission(uc, la, mask, entry, entry_count);
208 int __mdd_permission_internal(const struct lu_env *env, struct mdd_object *obj,
209 struct lu_attr *la, int mask, int role)
211 struct md_ucred *uc = md_ucred(env);
219 /* These means unnecessary for permission check */
220 if ((uc == NULL) || (uc->mu_valid == UCRED_INIT))
223 /* Invalid user credit */
224 if (uc->mu_valid == UCRED_INVALID)
228 * Nobody gets write access to an immutable file.
230 if ((mask & MAY_WRITE) && mdd_is_immutable(obj))
234 la = &mdd_env_info(env)->mti_la;
235 rc = mdd_la_get(env, obj, la, BYPASS_CAPA);
241 if (uc->mu_fsuid == la->la_uid) {
244 if (mode & S_IRWXG) {
246 mdd_read_lock(env, obj, role);
247 rc = mdd_check_acl(env, obj, la, mask);
249 mdd_read_unlock(env, obj);
251 goto check_capabilities;
252 else if ((rc != -EAGAIN) && (rc != -EOPNOTSUPP) &&
256 if (lustre_in_group_p(uc, la->la_gid))
260 if (((mode & mask & S_IRWXO) == mask))
264 if (!(mask & MAY_EXEC) ||
265 (la->la_mode & S_IXUGO) || S_ISDIR(la->la_mode))
266 if (mdd_capable(uc, CFS_CAP_DAC_OVERRIDE))
269 if ((mask == MAY_READ) ||
270 (S_ISDIR(la->la_mode) && !(mask & MAY_WRITE)))
271 if (mdd_capable(uc, CFS_CAP_DAC_READ_SEARCH))
277 int mdd_permission(const struct lu_env *env,
278 struct md_object *pobj, struct md_object *cobj,
279 struct md_attr *ma, int mask)
281 struct mdd_object *mdd_pobj, *mdd_cobj;
282 struct md_ucred *uc = NULL;
283 struct lu_attr *la = NULL;
284 int check_create, check_link;
286 int check_rename_src, check_rename_tar;
287 int check_vtx_part, check_vtx_full;
293 mdd_cobj = md2mdd_obj(cobj);
295 /* For cross_open case, the "mask" is open flags,
296 * so convert it to permission mask first.
297 * XXX: MDS_OPEN_CROSS must be NOT equal to permission mask MAY_*. */
298 if (unlikely(mask & MDS_OPEN_CROSS)) {
299 la = &mdd_env_info(env)->mti_la;
300 rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
304 mask = accmode(env, la, mask & ~MDS_OPEN_CROSS);
307 check_create = mask & MAY_CREATE;
308 check_link = mask & MAY_LINK;
309 check_unlink = mask & MAY_UNLINK;
310 check_rename_src = mask & MAY_RENAME_SRC;
311 check_rename_tar = mask & MAY_RENAME_TAR;
312 check_vtx_part = mask & MAY_VTX_PART;
313 check_vtx_full = mask & MAY_VTX_FULL;
314 check_rgetfacl = mask & MAY_RGETFACL;
316 mask &= ~(MAY_CREATE | MAY_LINK |
318 MAY_RENAME_SRC | MAY_RENAME_TAR |
319 MAY_VTX_PART | MAY_VTX_FULL |
322 rc = mdd_permission_internal_locked(env, mdd_cobj, NULL, mask,
325 if (!rc && (check_create || check_link))
326 rc = mdd_may_create(env, mdd_cobj, NULL, 1, check_link);
328 if (!rc && check_unlink) {
330 rc = mdd_may_unlink(env, mdd_cobj, ma);
333 if (!rc && (check_rename_src || check_rename_tar)) {
336 mdd_pobj = md2mdd_obj(pobj);
337 rc = mdd_may_delete(env, mdd_pobj, mdd_cobj, ma, 1,
341 if (!rc && (check_vtx_part || check_vtx_full)) {
345 la = &mdd_env_info(env)->mti_la;
346 rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
351 if (!(la->la_mode & S_ISVTX) || (la->la_uid == uc->mu_fsuid) ||
352 (check_vtx_full && (ma->ma_attr.la_valid & LA_UID) &&
353 (ma->ma_attr.la_uid == uc->mu_fsuid))) {
354 ma->ma_attr_flags |= MDS_VTX_BYPASS;
356 ma->ma_attr_flags &= ~MDS_VTX_BYPASS;
362 if (unlikely(!rc && check_rgetfacl)) {
367 la = &mdd_env_info(env)->mti_la;
368 rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
373 if (la->la_uid != uc->mu_fsuid &&
374 !mdd_capable(uc, CFS_CAP_FOWNER))
381 int mdd_capa_get(const struct lu_env *env, struct md_object *obj,
382 struct lustre_capa *capa, int renewal)
384 struct mdd_object *mdd_obj = md2mdd_obj(obj);
389 oc = mdo_capa_get(env, mdd_obj, renewal ? capa : NULL,
393 } else if (likely(oc != NULL)) {