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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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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 <obd_class.h>
45 #include <lustre_ver.h>
46 #include <lprocfs_status.h>
47 #include <lustre_mds.h>
49 #include "mdd_internal.h"
51 #ifdef CONFIG_FS_POSIX_ACL
54 * Get default acl EA only.
55 * Hold read_lock for mdd_obj.
57 int mdd_def_acl_get(const struct lu_env *env, struct mdd_object *mdd_obj,
64 if (ma->ma_valid & MA_ACL_DEF)
67 buf = mdd_buf_get(env, ma->ma_acl, ma->ma_acl_size);
68 rc = mdo_xattr_get(env, mdd_obj, buf, XATTR_NAME_ACL_DEFAULT,
72 ma->ma_valid |= MA_ACL_DEF;
74 } else if ((rc == -EOPNOTSUPP) || (rc == -ENODATA)) {
81 * Hold write_lock for o.
83 int mdd_acl_chmod(const struct lu_env *env, struct mdd_object *o, __u32 mode,
84 struct thandle *handle)
87 posix_acl_xattr_header *head;
88 posix_acl_xattr_entry *entry;
94 buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
95 sizeof(mdd_env_info(env)->mti_xattr_buf));
97 rc = mdo_xattr_get(env, o, buf, XATTR_NAME_ACL_ACCESS, BYPASS_CAPA);
98 if ((rc == -EOPNOTSUPP) || (rc == -ENODATA))
104 head = (posix_acl_xattr_header *)(buf->lb_buf);
105 entry = head->a_entries;
106 entry_count = (buf->lb_len - sizeof(head->a_version)) /
107 sizeof(posix_acl_xattr_entry);
108 if (entry_count <= 0)
111 rc = lustre_posix_acl_chmod_masq(entry, mode, entry_count);
115 rc = mdo_xattr_set(env, o, buf, XATTR_NAME_ACL_ACCESS,
116 0, handle, BYPASS_CAPA);
120 int mdd_acl_set(const struct lu_env *env, struct mdd_object *obj,
121 const struct lu_buf *buf, int fl)
123 struct mdd_device *mdd = mdd_obj2mdd_dev(obj);
124 struct lu_attr *la = &mdd_env_info(env)->mti_la;
125 struct thandle *handle;
126 posix_acl_xattr_header *head;
127 posix_acl_xattr_entry *entry;
129 bool not_equiv, mode_change;
133 rc = mdd_la_get(env, obj, la, BYPASS_CAPA);
137 head = (posix_acl_xattr_header *)(buf->lb_buf);
138 entry = head->a_entries;
139 entry_count = (buf->lb_len - sizeof(head->a_version)) /
140 sizeof(posix_acl_xattr_entry);
141 if (entry_count <= 0)
144 LASSERT(la->la_valid & LA_MODE);
146 rc = lustre_posix_acl_equiv_mode(entry, &mode, entry_count);
150 not_equiv = (rc > 0);
151 mode_change = (mode != la->la_mode);
153 handle = mdd_trans_create(env, mdd);
155 RETURN(PTR_ERR(handle));
157 /* rc tells whether ACL can be represented by i_mode only */
159 rc = mdo_declare_xattr_set(env, obj, buf,
160 XATTR_NAME_ACL_ACCESS, fl, handle);
162 rc = mdo_declare_xattr_del(env, obj, XATTR_NAME_ACL_ACCESS,
169 rc = mdo_declare_attr_set(env, obj, la, handle);
172 rc = mdd_trans_start(env, mdd, handle);
176 mdd_write_lock(env, obj, MOR_TGT_CHILD);
177 /* whether ACL can be represented by i_mode only */
179 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_ACCESS, fl,
180 handle, mdd_object_capa(env, obj));
182 rc = mdo_xattr_del(env, obj, XATTR_NAME_ACL_ACCESS, handle,
183 mdd_object_capa(env, obj));
188 rc = mdo_attr_set(env, obj, la, handle,
189 mdd_object_capa(env, obj));
191 /* security-replated changes may require sync */
192 handle->th_sync |= !!mdd->mdd_sync_permission;
194 mdd_write_unlock(env, obj);
196 mdd_trans_stop(env, mdd, rc, handle);
202 * Hold write_lock for obj.
204 int __mdd_acl_init(const struct lu_env *env, struct mdd_object *obj,
205 struct lu_buf *buf, __u32 *mode, struct thandle *handle)
207 posix_acl_xattr_header *head;
208 posix_acl_xattr_entry *entry;
215 head = (posix_acl_xattr_header *)(buf->lb_buf);
216 entry = head->a_entries;
217 entry_count = (buf->lb_len - sizeof(head->a_version)) /
218 sizeof(posix_acl_xattr_entry);
219 if (entry_count <= 0)
222 if (S_ISDIR(*mode)) {
223 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_DEFAULT, 0,
224 handle, BYPASS_CAPA);
229 rc = lustre_posix_acl_create_masq(entry, mode, entry_count);
233 /* part of ACL went into i_mode */
235 struct mdd_thread_info *info = mdd_env_info(env);
236 struct lu_attr *pattr = &info->mti_pattr;
238 /* mode was initialized within object creation,
239 * so we need explict ->attr_set() to update it */
240 pattr->la_valid = LA_MODE;
241 pattr->la_mode = *mode;
242 rc2 = mdo_attr_set(env, obj, pattr, handle, BYPASS_CAPA);
248 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_ACCESS, 0,
249 handle, BYPASS_CAPA);
255 * Hold read_lock for obj.
257 static int mdd_check_acl(const struct lu_env *env, struct mdd_object *obj,
258 struct lu_attr *la, int mask)
260 #ifdef CONFIG_FS_POSIX_ACL
261 struct md_ucred *uc = md_ucred(env);
262 posix_acl_xattr_header *head;
263 posix_acl_xattr_entry *entry;
269 buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
270 sizeof(mdd_env_info(env)->mti_xattr_buf));
271 rc = mdo_xattr_get(env, obj, buf, XATTR_NAME_ACL_ACCESS,
272 mdd_object_capa(env, obj));
274 RETURN(rc ? : -EACCES);
277 head = (posix_acl_xattr_header *)(buf->lb_buf);
278 entry = head->a_entries;
279 entry_count = (buf->lb_len - sizeof(head->a_version)) /
280 sizeof(posix_acl_xattr_entry);
282 rc = lustre_posix_acl_permission(uc, la, mask, entry, entry_count);
290 int __mdd_permission_internal(const struct lu_env *env, struct mdd_object *obj,
291 struct lu_attr *la, int mask, int role)
293 struct md_ucred *uc = md_ucred(env);
301 /* These means unnecessary for permission check */
302 if ((uc == NULL) || (uc->mu_valid == UCRED_INIT))
305 /* Invalid user credit */
306 if (uc->mu_valid == UCRED_INVALID)
310 * Nobody gets write access to an immutable file.
312 if ((mask & MAY_WRITE) && mdd_is_immutable(obj))
316 la = &mdd_env_info(env)->mti_la;
317 rc = mdd_la_get(env, obj, la, BYPASS_CAPA);
323 if (uc->mu_fsuid == la->la_uid) {
326 if (mode & S_IRWXG) {
328 mdd_read_lock(env, obj, role);
329 rc = mdd_check_acl(env, obj, la, mask);
331 mdd_read_unlock(env, obj);
333 goto check_capabilities;
334 else if ((rc != -EAGAIN) && (rc != -EOPNOTSUPP) &&
338 if (lustre_in_group_p(uc, la->la_gid))
342 if (((mode & mask & S_IRWXO) == mask))
346 if (!(mask & MAY_EXEC) ||
347 (la->la_mode & S_IXUGO) || S_ISDIR(la->la_mode))
348 if (mdd_capable(uc, CFS_CAP_DAC_OVERRIDE))
351 if ((mask == MAY_READ) ||
352 (S_ISDIR(la->la_mode) && !(mask & MAY_WRITE)))
353 if (mdd_capable(uc, CFS_CAP_DAC_READ_SEARCH))
359 int mdd_permission(const struct lu_env *env,
360 struct md_object *pobj, struct md_object *cobj,
361 struct md_attr *ma, int mask)
363 struct mdd_object *mdd_pobj, *mdd_cobj;
364 struct md_ucred *uc = NULL;
365 struct lu_attr *la = &mdd_env_info(env)->mti_cattr;
366 int check_create, check_link;
368 int check_rename_src, check_rename_tar;
369 int check_vtx_part, check_vtx_full;
375 mdd_cobj = md2mdd_obj(cobj);
377 rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
381 /* For cross_open case, the "mask" is open flags,
382 * so convert it to permission mask first.
383 * XXX: MDS_OPEN_CROSS must be NOT equal to permission mask MAY_*. */
384 if (unlikely(mask & MDS_OPEN_CROSS))
385 mask = accmode(env, la, mask & ~MDS_OPEN_CROSS);
387 check_create = mask & MAY_CREATE;
388 check_link = mask & MAY_LINK;
389 check_unlink = mask & MAY_UNLINK;
390 check_rename_src = mask & MAY_RENAME_SRC;
391 check_rename_tar = mask & MAY_RENAME_TAR;
392 check_vtx_part = mask & MAY_VTX_PART;
393 check_vtx_full = mask & MAY_VTX_FULL;
394 check_rgetfacl = mask & MAY_RGETFACL;
396 mask &= ~(MAY_CREATE | MAY_LINK |
398 MAY_RENAME_SRC | MAY_RENAME_TAR |
399 MAY_VTX_PART | MAY_VTX_FULL |
402 rc = mdd_permission_internal_locked(env, mdd_cobj, NULL, mask,
405 if (!rc && (check_create || check_link))
406 rc = mdd_may_create(env, mdd_cobj, NULL, 1, check_link);
408 if (!rc && check_unlink)
409 rc = mdd_may_unlink(env, mdd_cobj, la);
411 if (!rc && (check_rename_src || check_rename_tar)) {
413 mdd_pobj = md2mdd_obj(pobj);
414 rc = mdd_may_delete(env, mdd_pobj, mdd_cobj, la, NULL, 1,
418 if (!rc && (check_vtx_part || check_vtx_full)) {
421 la = &mdd_env_info(env)->mti_la;
422 rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
427 if (!(la->la_mode & S_ISVTX) || (la->la_uid == uc->mu_fsuid) ||
428 (check_vtx_full && (ma->ma_attr.la_valid & LA_UID) &&
429 (ma->ma_attr.la_uid == uc->mu_fsuid))) {
430 ma->ma_attr_flags |= MDS_VTX_BYPASS;
432 ma->ma_attr_flags &= ~MDS_VTX_BYPASS;
438 if (unlikely(!rc && check_rgetfacl)) {
442 if (la->la_uid != uc->mu_fsuid &&
443 !mdd_capable(uc, CFS_CAP_FOWNER))
450 int mdd_capa_get(const struct lu_env *env, struct md_object *obj,
451 struct lustre_capa *capa, int renewal)
453 struct mdd_object *mdd_obj = md2mdd_obj(obj);
458 oc = mdo_capa_get(env, mdd_obj, renewal ? capa : NULL,
462 } else if (likely(oc != NULL)) {