X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Fmdd%2Fmdd_permission.c;h=4b4f9b9f3ce91b94c0f176033c9e3ba6ac690010;hb=f7df2365bc51a7b2804f9b497cbc6bc340dd9da1;hp=f52d617f672a9659f4c12f9a60634c8f870cce66;hpb=c0e6982b57319e5044cf12bee509c0c571a17cc5;p=fs%2Flustre-release.git

diff --git a/lustre/mdd/mdd_permission.c b/lustre/mdd/mdd_permission.c
index f52d617..4b4f9b9 100644
--- a/lustre/mdd/mdd_permission.c
+++ b/lustre/mdd/mdd_permission.c
@@ -15,11 +15,7 @@
  *
  * You should have received a copy of the GNU General Public License
  * version 2 along with this program; If not, see
- * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
+ * http://www.gnu.org/licenses/gpl-2.0.html
  *
  * GPL HEADER END
  */
@@ -27,7 +23,7 @@
  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2012, 2013, Intel Corporation.
+ * Copyright (c) 2012, 2016, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
@@ -58,7 +54,7 @@
 int mdd_acl_chmod(const struct lu_env *env, struct mdd_object *o, __u32 mode,
 		  struct thandle *handle)
 {
-	struct lu_buf           *buf;
+	struct lu_buf            buf;
 	posix_acl_xattr_header  *head;
 	posix_acl_xattr_entry   *entry;
 	int                      entry_count;
@@ -66,19 +62,19 @@ int mdd_acl_chmod(const struct lu_env *env, struct mdd_object *o, __u32 mode,
 
 	ENTRY;
 
-	buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
-			  sizeof(mdd_env_info(env)->mti_xattr_buf));
-
-	rc = mdo_xattr_get(env, o, buf, XATTR_NAME_ACL_ACCESS, BYPASS_CAPA);
+	lu_buf_check_and_alloc(&mdd_env_info(env)->mti_xattr_buf,
+			mdd_obj2mdd_dev(o)->mdd_dt_conf.ddp_max_ea_size);
+	buf = mdd_env_info(env)->mti_xattr_buf;
+	rc = mdo_xattr_get(env, o, &buf, XATTR_NAME_ACL_ACCESS);
 	if ((rc == -EOPNOTSUPP) || (rc == -ENODATA))
 		RETURN(0);
 	else if (rc <= 0)
 		RETURN(rc);
 
-	buf->lb_len = rc;
-	head = (posix_acl_xattr_header *)(buf->lb_buf);
-	entry = head->a_entries;
-	entry_count = (buf->lb_len - sizeof(head->a_version)) /
+	buf.lb_len = rc;
+	head = (posix_acl_xattr_header *)(buf.lb_buf);
+	entry = GET_POSIX_ACL_XATTR_ENTRY(head);
+	entry_count = (buf.lb_len - sizeof(head->a_version)) /
 		sizeof(posix_acl_xattr_entry);
 	if (entry_count <= 0)
 		RETURN(0);
@@ -87,30 +83,26 @@ int mdd_acl_chmod(const struct lu_env *env, struct mdd_object *o, __u32 mode,
 	if (rc)
 		RETURN(rc);
 
-	rc = mdo_xattr_set(env, o, buf, XATTR_NAME_ACL_ACCESS,
-			   0, handle, BYPASS_CAPA);
+	rc = mdo_xattr_set(env, o, &buf, XATTR_NAME_ACL_ACCESS,
+			   0, handle);
 	RETURN(rc);
 }
 
 int mdd_acl_set(const struct lu_env *env, struct mdd_object *obj,
-		const struct lu_buf *buf, int fl)
+		struct lu_attr *la, const struct lu_buf *buf, int fl)
 {
 	struct mdd_device	*mdd = mdd_obj2mdd_dev(obj);
-	struct lu_attr		*la = &mdd_env_info(env)->mti_la;
 	struct thandle		*handle;
 	posix_acl_xattr_header	*head;
 	posix_acl_xattr_entry	*entry;
-	int			 rc, entry_count;
+	int			 entry_count;
 	bool			 not_equiv, mode_change;
 	mode_t			 mode;
+	int			 rc;
 	ENTRY;
 
-	rc = mdd_la_get(env, obj, la, BYPASS_CAPA);
-	if (rc)
-		RETURN(rc);
-
 	head = (posix_acl_xattr_header *)(buf->lb_buf);
-	entry = head->a_entries;
+	entry = GET_POSIX_ACL_XATTR_ENTRY(head);
 	entry_count = (buf->lb_len - sizeof(head->a_version)) /
 		sizeof(posix_acl_xattr_entry);
 	if (entry_count <= 0)
@@ -141,6 +133,7 @@ int mdd_acl_set(const struct lu_env *env, struct mdd_object *obj,
 
 	if (mode_change) {
 		la->la_mode = mode;
+		la->la_valid = LA_MODE;
 		rc = mdo_declare_attr_set(env, obj, la, handle);
 	}
 
@@ -152,16 +145,14 @@ int mdd_acl_set(const struct lu_env *env, struct mdd_object *obj,
 	/* whether ACL can be represented by i_mode only */
 	if (not_equiv)
 		rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_ACCESS, fl,
-				handle, mdd_object_capa(env, obj));
+				   handle);
 	else
-		rc = mdo_xattr_del(env, obj, XATTR_NAME_ACL_ACCESS, handle,
-				mdd_object_capa(env, obj));
+		rc = mdo_xattr_del(env, obj, XATTR_NAME_ACL_ACCESS, handle);
 	if (rc)
 		GOTO(unlock, rc);
 
 	if (mode_change)
-		rc = mdo_attr_set(env, obj, la, handle,
-				mdd_object_capa(env, obj));
+		rc = mdo_attr_set(env, obj, la, handle);
 
 	/* security-replated changes may require sync */
 	if (S_ISDIR(mdd_object_type(obj)))
@@ -169,7 +160,7 @@ int mdd_acl_set(const struct lu_env *env, struct mdd_object *obj,
 unlock:
 	mdd_write_unlock(env, obj);
 stop:
-	mdd_trans_stop(env, mdd, rc, handle);
+	rc = mdd_trans_stop(env, mdd, rc, handle);
 
 	RETURN(rc);
 }
@@ -191,7 +182,7 @@ int __mdd_fix_mode_acl(const struct lu_env *env, struct lu_buf *buf,
 	ENTRY;
 
 	head = (posix_acl_xattr_header *)(buf->lb_buf);
-	entry = head->a_entries;
+	entry = GET_POSIX_ACL_XATTR_ENTRY(head);
 	entry_count = (buf->lb_len - sizeof(head->a_version)) /
 		      sizeof(posix_acl_xattr_entry);
 	if (entry_count <= 0)
@@ -208,48 +199,52 @@ int __mdd_fix_mode_acl(const struct lu_env *env, struct lu_buf *buf,
  * Hold read_lock for obj.
  */
 static int mdd_check_acl(const struct lu_env *env, struct mdd_object *obj,
-                         struct lu_attr *la, int mask)
+			const struct lu_attr *la, int mask)
 {
 #ifdef CONFIG_FS_POSIX_ACL
 	struct lu_ucred  *uc  = lu_ucred_assert(env);
-        posix_acl_xattr_header *head;
-        posix_acl_xattr_entry *entry;
-        struct lu_buf   *buf;
-        int entry_count;
-        int rc;
-        ENTRY;
-
-        buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
-                          sizeof(mdd_env_info(env)->mti_xattr_buf));
-        rc = mdo_xattr_get(env, obj, buf, XATTR_NAME_ACL_ACCESS,
-                           mdd_object_capa(env, obj));
-        if (rc <= 0)
-                RETURN(rc ? : -EACCES);
-
-        buf->lb_len = rc;
-        head = (posix_acl_xattr_header *)(buf->lb_buf);
-        entry = head->a_entries;
-        entry_count = (buf->lb_len - sizeof(head->a_version)) /
-                      sizeof(posix_acl_xattr_entry);
-
-        rc = lustre_posix_acl_permission(uc, la, mask, entry, entry_count);
-        RETURN(rc);
+	posix_acl_xattr_header *head;
+	posix_acl_xattr_entry *entry;
+	struct lu_buf buf;
+	int entry_count;
+	int rc;
+	ENTRY;
+
+	lu_buf_check_and_alloc(&mdd_env_info(env)->mti_xattr_buf,
+			mdd_obj2mdd_dev(obj)->mdd_dt_conf.ddp_max_ea_size);
+	buf = mdd_env_info(env)->mti_xattr_buf;
+	rc = mdo_xattr_get(env, obj, &buf, XATTR_NAME_ACL_ACCESS);
+	if (rc <= 0)
+		RETURN(rc ? : -EACCES);
+
+	buf.lb_len = rc;
+	head = (posix_acl_xattr_header *)(buf.lb_buf);
+	entry = GET_POSIX_ACL_XATTR_ENTRY(head);
+	entry_count = posix_acl_xattr_count(buf.lb_len);
+
+	/* Disregard empty ACLs and fall back to
+	 * standard UNIX permissions. See LU-5434 */
+	if (entry_count <= 0)
+		RETURN(-EAGAIN);
+
+	rc = lustre_posix_acl_permission(uc, la, mask, entry, entry_count);
+	RETURN(rc);
 #else
-        ENTRY;
-        RETURN(-EAGAIN);
+	ENTRY;
+	RETURN(-EAGAIN);
 #endif
 }
 
 int __mdd_permission_internal(const struct lu_env *env, struct mdd_object *obj,
-                              struct lu_attr *la, int mask, int role)
+			      const struct lu_attr *la, int mask, int role)
 {
 	struct lu_ucred *uc = lu_ucred(env);
-        __u32 mode;
-        int rc;
-        ENTRY;
+	__u32 mode;
+	int rc;
+	ENTRY;
 
-        if (mask == 0)
-                RETURN(0);
+	if (mask == 0)
+		RETURN(0);
 
 	/* These means unnecessary for permission check */
 	if ((uc == NULL) || (uc->uc_valid == UCRED_INIT))
@@ -259,20 +254,15 @@ int __mdd_permission_internal(const struct lu_env *env, struct mdd_object *obj,
 	if (uc->uc_valid == UCRED_INVALID)
 		RETURN(-EACCES);
 
-        /*
-         * Nobody gets write access to an immutable file.
-         */
-        if ((mask & MAY_WRITE) && mdd_is_immutable(obj))
-                RETURN(-EACCES);
-
-        if (la == NULL) {
-                la = &mdd_env_info(env)->mti_la;
-                rc = mdd_la_get(env, obj, la, BYPASS_CAPA);
-                if (rc)
-                        RETURN(rc);
-        }
+	/*
+	 * Nobody gets write access to an immutable file.
+	 */
+	if (mask & MAY_WRITE && la->la_flags & LUSTRE_IMMUTABLE_FL)
+		RETURN(-EACCES);
 
-        mode = la->la_mode;
+	LASSERT(la != NULL);
+
+	mode = la->la_mode;
 	if (uc->uc_fsuid == la->la_uid) {
 		mode >>= 6;
         } else {
@@ -306,6 +296,9 @@ check_capabilities:
 		if (md_capable(uc, CFS_CAP_DAC_READ_SEARCH))
 			RETURN(0);
 
+	CDEBUG(D_SEC, "permission denied, mode %x, fsuid %u, uid %u\n",
+	       la->la_mode, uc->uc_fsuid, la->la_uid);
+
 	RETURN(-EACCES);
 }
 
@@ -313,109 +306,46 @@ int mdd_permission(const struct lu_env *env,
                    struct md_object *pobj, struct md_object *cobj,
                    struct md_attr *ma, int mask)
 {
-        struct mdd_object *mdd_pobj, *mdd_cobj;
+	struct mdd_object *mdd_pobj = NULL;
+	struct mdd_object *mdd_cobj;
 	struct lu_ucred *uc = NULL;
-	struct lu_attr *la = &mdd_env_info(env)->mti_cattr;
-        int check_create, check_link;
-        int check_unlink;
-        int check_rename_src, check_rename_tar;
-        int check_vtx_part, check_vtx_full;
-        int check_rgetfacl;
-        int rc = 0;
-        ENTRY;
-
-        LASSERT(cobj);
-        mdd_cobj = md2mdd_obj(cobj);
-
-	rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
+	struct lu_attr *pattr = NULL;
+	struct lu_attr *cattr = MDD_ENV_VAR(env, cattr);
+	int rc = 0;
+	ENTRY;
+
+	LASSERT(cobj);
+	if (pobj != NULL) {
+		mdd_pobj = md2mdd_obj(pobj);
+		pattr = MDD_ENV_VAR(env, pattr);
+		rc = mdd_la_get(env, mdd_pobj, pattr);
+		if (rc)
+			RETURN(rc);
+	}
+
+	mdd_cobj = md2mdd_obj(cobj);
+	rc = mdd_la_get(env, mdd_cobj, cattr);
 	if (rc)
 		RETURN(rc);
 
-        /* For cross_open case, the "mask" is open flags,
-         * so convert it to permission mask first.
-         * XXX: MDS_OPEN_CROSS must be NOT equal to permission mask MAY_*. */
+	/* For cross_open case, the "mask" is open flags,
+	 * so convert it to permission mask first.
+	 * XXX: MDS_OPEN_CROSS must be NOT equal to permission mask MAY_*. */
 	if (unlikely(mask & MDS_OPEN_CROSS))
-		mask = accmode(env, la, mask & ~MDS_OPEN_CROSS);
-
-        check_create = mask & MAY_CREATE;
-        check_link = mask & MAY_LINK;
-        check_unlink = mask & MAY_UNLINK;
-        check_rename_src = mask & MAY_RENAME_SRC;
-        check_rename_tar = mask & MAY_RENAME_TAR;
-        check_vtx_part = mask & MAY_VTX_PART;
-        check_vtx_full = mask & MAY_VTX_FULL;
-        check_rgetfacl = mask & MAY_RGETFACL;
-
-        mask &= ~(MAY_CREATE | MAY_LINK |
-                MAY_UNLINK |
-                MAY_RENAME_SRC | MAY_RENAME_TAR |
-                MAY_VTX_PART | MAY_VTX_FULL |
-                MAY_RGETFACL);
-
-        rc = mdd_permission_internal_locked(env, mdd_cobj, NULL, mask,
-                                            MOR_TGT_CHILD);
-
-        if (!rc && (check_create || check_link))
-                rc = mdd_may_create(env, mdd_cobj, NULL, 1, check_link);
-
-	if (!rc && check_unlink)
-		rc = mdd_may_unlink(env, mdd_cobj, la);
-
-        if (!rc && (check_rename_src || check_rename_tar)) {
-                LASSERT(pobj);
-                mdd_pobj = md2mdd_obj(pobj);
-		rc = mdd_may_delete(env, mdd_pobj, mdd_cobj, la, NULL, 1,
-                                    check_rename_tar);
-        }
+		mask = accmode(env, cattr, mask & ~MDS_OPEN_CROSS);
 
-        if (!rc && (check_vtx_part || check_vtx_full)) {
-		uc = lu_ucred_assert(env);
-                if (likely(!la)) {
-                        la = &mdd_env_info(env)->mti_la;
-                        rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
-                        if (rc)
-                                RETURN(rc);
-                }
+	rc = mdd_permission_internal_locked(env, mdd_cobj, cattr,
+					    mask & ~MAY_RGETFACL,
+					    MOR_TGT_CHILD);
 
-		if (!(la->la_mode & S_ISVTX) || (la->la_uid == uc->uc_fsuid) ||
-		    (check_vtx_full && (ma->ma_attr.la_valid & LA_UID) &&
-		     (ma->ma_attr.la_uid == uc->uc_fsuid))) {
-			ma->ma_attr_flags |= MDS_VTX_BYPASS;
-                } else {
-                        ma->ma_attr_flags &= ~MDS_VTX_BYPASS;
-                        if (check_vtx_full)
-                                rc = -EPERM;
-                }
-        }
-
-        if (unlikely(!rc && check_rgetfacl)) {
-                if (likely(!uc))
+	if (unlikely(rc == 0 && (mask & MAY_RGETFACL))) {
+		if (likely(!uc))
 			uc = lu_ucred_assert(env);
 
-		if (la->la_uid != uc->uc_fsuid &&
+		if (cattr->la_uid != uc->uc_fsuid &&
 		    !md_capable(uc, CFS_CAP_FOWNER))
 			rc = -EPERM;
-        }
-
-        RETURN(rc);
-}
-
-int mdd_capa_get(const struct lu_env *env, struct md_object *obj,
-                 struct lustre_capa *capa, int renewal)
-{
-        struct mdd_object *mdd_obj = md2mdd_obj(obj);
-        struct obd_capa *oc;
-        int rc = 0;
-        ENTRY;
-
-        oc = mdo_capa_get(env, mdd_obj, renewal ? capa : NULL,
-                          capa->lc_opc);
-        if (IS_ERR(oc)) {
-                rc = PTR_ERR(oc);
-        } else if (likely(oc != NULL)) {
-                capa_cpy(capa, oc);
-                capa_put(oc);
-        }
+	}
 
-        RETURN(rc);
+	RETURN(rc);
 }