--- /dev/null
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * 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.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ */
+
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/selinux.h>
+
+#define DEBUG_SUBSYSTEM S_LLITE
+
+#include "../include/obd_support.h"
+#include "../include/lustre_lite.h"
+#include "../include/lustre_dlm.h"
+#include "../include/lustre_ver.h"
+#include "../include/lustre_eacl.h"
+
+#include "llite_internal.h"
+
+#define XATTR_USER_T (1)
+#define XATTR_TRUSTED_T (2)
+#define XATTR_SECURITY_T (3)
+#define XATTR_ACL_ACCESS_T (4)
+#define XATTR_ACL_DEFAULT_T (5)
+#define XATTR_LUSTRE_T (6)
+#define XATTR_OTHER_T (7)
+
+static
+int get_xattr_type(const char *name)
+{
+ if (!strcmp(name, POSIX_ACL_XATTR_ACCESS))
+ return XATTR_ACL_ACCESS_T;
+
+ if (!strcmp(name, POSIX_ACL_XATTR_DEFAULT))
+ return XATTR_ACL_DEFAULT_T;
+
+ if (!strncmp(name, XATTR_USER_PREFIX,
+ sizeof(XATTR_USER_PREFIX) - 1))
+ return XATTR_USER_T;
+
+ if (!strncmp(name, XATTR_TRUSTED_PREFIX,
+ sizeof(XATTR_TRUSTED_PREFIX) - 1))
+ return XATTR_TRUSTED_T;
+
+ if (!strncmp(name, XATTR_SECURITY_PREFIX,
+ sizeof(XATTR_SECURITY_PREFIX) - 1))
+ return XATTR_SECURITY_T;
+
+ if (!strncmp(name, XATTR_LUSTRE_PREFIX,
+ sizeof(XATTR_LUSTRE_PREFIX) - 1))
+ return XATTR_LUSTRE_T;
+
+ return XATTR_OTHER_T;
+}
+
+static
+int xattr_type_filter(struct ll_sb_info *sbi, int xattr_type)
+{
+ if ((xattr_type == XATTR_ACL_ACCESS_T ||
+ xattr_type == XATTR_ACL_DEFAULT_T) &&
+ !(sbi->ll_flags & LL_SBI_ACL))
+ return -EOPNOTSUPP;
+
+ if (xattr_type == XATTR_USER_T && !(sbi->ll_flags & LL_SBI_USER_XATTR))
+ return -EOPNOTSUPP;
+ if (xattr_type == XATTR_TRUSTED_T && !capable(CFS_CAP_SYS_ADMIN))
+ return -EPERM;
+ if (xattr_type == XATTR_OTHER_T)
+ return -EOPNOTSUPP;
+
+ return 0;
+}
+
+static
+int ll_setxattr_common(struct inode *inode, const char *name,
+ const void *value, size_t size,
+ int flags, __u64 valid)
+{
+ struct ll_sb_info *sbi = ll_i2sbi(inode);
+ struct ptlrpc_request *req = NULL;
+ int xattr_type, rc;
+ struct obd_capa *oc;
+#ifdef CONFIG_FS_POSIX_ACL
+ struct rmtacl_ctl_entry *rce = NULL;
+ posix_acl_xattr_header *new_value = NULL;
+ ext_acl_xattr_header *acl = NULL;
+#endif
+ const char *pv = value;
+
+ xattr_type = get_xattr_type(name);
+ rc = xattr_type_filter(sbi, xattr_type);
+ if (rc)
+ return rc;
+
+ if ((xattr_type == XATTR_ACL_ACCESS_T ||
+ xattr_type == XATTR_ACL_DEFAULT_T) &&
+ !inode_owner_or_capable(inode))
+ return -EPERM;
+
+ /* b10667: ignore lustre special xattr for now */
+ if ((xattr_type == XATTR_TRUSTED_T && strcmp(name, "trusted.lov") == 0) ||
+ (xattr_type == XATTR_LUSTRE_T && strcmp(name, "lustre.lov") == 0))
+ return 0;
+
+ /* b15587: ignore security.capability xattr for now */
+ if ((xattr_type == XATTR_SECURITY_T &&
+ strcmp(name, "security.capability") == 0))
+ return 0;
+
+ /* LU-549: Disable security.selinux when selinux is disabled */
+ if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() &&
+ strcmp(name, "security.selinux") == 0)
+ return -EOPNOTSUPP;
+
+#ifdef CONFIG_FS_POSIX_ACL
+ if (sbi->ll_flags & LL_SBI_RMT_CLIENT &&
+ (xattr_type == XATTR_ACL_ACCESS_T ||
+ xattr_type == XATTR_ACL_DEFAULT_T)) {
+ rce = rct_search(&sbi->ll_rct, current_pid());
+ if (rce == NULL ||
+ (rce->rce_ops != RMT_LSETFACL &&
+ rce->rce_ops != RMT_RSETFACL))
+ return -EOPNOTSUPP;
+
+ if (rce->rce_ops == RMT_LSETFACL) {
+ struct eacl_entry *ee;
+
+ ee = et_search_del(&sbi->ll_et, current_pid(),
+ ll_inode2fid(inode), xattr_type);
+ LASSERT(ee != NULL);
+ if (valid & OBD_MD_FLXATTR) {
+ acl = lustre_acl_xattr_merge2ext(
+ (posix_acl_xattr_header *)value,
+ size, ee->ee_acl);
+ if (IS_ERR(acl)) {
+ ee_free(ee);
+ return PTR_ERR(acl);
+ }
+ size = CFS_ACL_XATTR_SIZE(\
+ le32_to_cpu(acl->a_count), \
+ ext_acl_xattr);
+ pv = (const char *)acl;
+ }
+ ee_free(ee);
+ } else if (rce->rce_ops == RMT_RSETFACL) {
+ size = lustre_posix_acl_xattr_filter(
+ (posix_acl_xattr_header *)value,
+ size, &new_value);
+ if (unlikely(size < 0))
+ return size;
+
+ pv = (const char *)new_value;
+ } else
+ return -EOPNOTSUPP;
+
+ valid |= rce_ops2valid(rce->rce_ops);
+ }
+#endif
+ oc = ll_mdscapa_get(inode);
+ rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode), oc,
+ valid, name, pv, size, 0, flags,
+ ll_i2suppgid(inode), &req);
+ capa_put(oc);
+#ifdef CONFIG_FS_POSIX_ACL
+ if (new_value != NULL)
+ lustre_posix_acl_xattr_free(new_value, size);
+ if (acl != NULL)
+ lustre_ext_acl_xattr_free(acl);
+#endif
+ if (rc) {
+ if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) {
+ LCONSOLE_INFO("Disabling user_xattr feature because it is not supported on the server\n");
+ sbi->ll_flags &= ~LL_SBI_USER_XATTR;
+ }
+ return rc;
+ }
+
+ ptlrpc_req_finished(req);
+ return 0;
+}
+
+int ll_setxattr(struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags)
+{
+ struct inode *inode = d_inode(dentry);
+
+ LASSERT(inode);
+ LASSERT(name);
+
+ CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n",
+ inode->i_ino, inode->i_generation, inode, name);
+
+ ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_SETXATTR, 1);
+
+ if ((strncmp(name, XATTR_TRUSTED_PREFIX,
+ sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 &&
+ strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) ||
+ (strncmp(name, XATTR_LUSTRE_PREFIX,
+ sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 &&
+ strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) {
+ struct lov_user_md *lump = (struct lov_user_md *)value;
+ int rc = 0;
+
+ if (size != 0 && size < sizeof(struct lov_user_md))
+ return -EINVAL;
+
+ /* Attributes that are saved via getxattr will always have
+ * the stripe_offset as 0. Instead, the MDS should be
+ * allowed to pick the starting OST index. b=17846 */
+ if (lump != NULL && lump->lmm_stripe_offset == 0)
+ lump->lmm_stripe_offset = -1;
+
+ if (lump != NULL && S_ISREG(inode->i_mode)) {
+ int flags = FMODE_WRITE;
+ int lum_size = (lump->lmm_magic == LOV_USER_MAGIC_V1) ?
+ sizeof(*lump) : sizeof(struct lov_user_md_v3);
+
+ rc = ll_lov_setstripe_ea_info(inode, dentry, flags, lump,
+ lum_size);
+ /* b10667: rc always be 0 here for now */
+ rc = 0;
+ } else if (S_ISDIR(inode->i_mode)) {
+ rc = ll_dir_setstripe(inode, lump, 0);
+ }
+
+ return rc;
+
+ } else if (strcmp(name, XATTR_NAME_LMA) == 0 ||
+ strcmp(name, XATTR_NAME_LINK) == 0)
+ return 0;
+
+ return ll_setxattr_common(inode, name, value, size, flags,
+ OBD_MD_FLXATTR);
+}
+
+int ll_removexattr(struct dentry *dentry, const char *name)
+{
+ struct inode *inode = d_inode(dentry);
+
+ LASSERT(inode);
+ LASSERT(name);
+
+ CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n",
+ inode->i_ino, inode->i_generation, inode, name);
+
+ ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_REMOVEXATTR, 1);
+ return ll_setxattr_common(inode, name, NULL, 0, 0,
+ OBD_MD_FLXATTRRM);
+}
+
+static
+int ll_getxattr_common(struct inode *inode, const char *name,
+ void *buffer, size_t size, __u64 valid)
+{
+ struct ll_sb_info *sbi = ll_i2sbi(inode);
+ struct ptlrpc_request *req = NULL;
+ struct mdt_body *body;
+ int xattr_type, rc;
+ void *xdata;
+ struct obd_capa *oc;
+ struct rmtacl_ctl_entry *rce = NULL;
+ struct ll_inode_info *lli = ll_i2info(inode);
+
+ CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n",
+ inode->i_ino, inode->i_generation, inode);
+
+ /* listxattr have slightly different behavior from of ext3:
+ * without 'user_xattr' ext3 will list all xattr names but
+ * filtered out "^user..*"; we list them all for simplicity.
+ */
+ if (!name) {
+ xattr_type = XATTR_OTHER_T;
+ goto do_getxattr;
+ }
+
+ xattr_type = get_xattr_type(name);
+ rc = xattr_type_filter(sbi, xattr_type);
+ if (rc)
+ return rc;
+
+ /* b15587: ignore security.capability xattr for now */
+ if ((xattr_type == XATTR_SECURITY_T &&
+ strcmp(name, "security.capability") == 0))
+ return -ENODATA;
+
+ /* LU-549: Disable security.selinux when selinux is disabled */
+ if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() &&
+ strcmp(name, "security.selinux") == 0)
+ return -EOPNOTSUPP;
+
+#ifdef CONFIG_FS_POSIX_ACL
+ if (sbi->ll_flags & LL_SBI_RMT_CLIENT &&
+ (xattr_type == XATTR_ACL_ACCESS_T ||
+ xattr_type == XATTR_ACL_DEFAULT_T)) {
+ rce = rct_search(&sbi->ll_rct, current_pid());
+ if (rce == NULL ||
+ (rce->rce_ops != RMT_LSETFACL &&
+ rce->rce_ops != RMT_LGETFACL &&
+ rce->rce_ops != RMT_RSETFACL &&
+ rce->rce_ops != RMT_RGETFACL))
+ return -EOPNOTSUPP;
+ }
+
+ /* posix acl is under protection of LOOKUP lock. when calling to this,
+ * we just have path resolution to the target inode, so we have great
+ * chance that cached ACL is uptodate.
+ */
+ if (xattr_type == XATTR_ACL_ACCESS_T &&
+ !(sbi->ll_flags & LL_SBI_RMT_CLIENT)) {
+
+ struct posix_acl *acl;
+
+ spin_lock(&lli->lli_lock);
+ acl = posix_acl_dup(lli->lli_posix_acl);
+ spin_unlock(&lli->lli_lock);
+
+ if (!acl)
+ return -ENODATA;
+
+ rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
+ posix_acl_release(acl);
+ return rc;
+ }
+ if (xattr_type == XATTR_ACL_DEFAULT_T && !S_ISDIR(inode->i_mode))
+ return -ENODATA;
+#endif
+
+do_getxattr:
+ if (sbi->ll_xattr_cache_enabled && xattr_type != XATTR_ACL_ACCESS_T) {
+ rc = ll_xattr_cache_get(inode, name, buffer, size, valid);
+ if (rc == -EAGAIN)
+ goto getxattr_nocache;
+ if (rc < 0)
+ goto out_xattr;
+
+ /* Add "system.posix_acl_access" to the list */
+ if (lli->lli_posix_acl != NULL && valid & OBD_MD_FLXATTRLS) {
+ if (size == 0) {
+ rc += sizeof(XATTR_NAME_ACL_ACCESS);
+ } else if (size - rc >= sizeof(XATTR_NAME_ACL_ACCESS)) {
+ memcpy(buffer + rc, XATTR_NAME_ACL_ACCESS,
+ sizeof(XATTR_NAME_ACL_ACCESS));
+ rc += sizeof(XATTR_NAME_ACL_ACCESS);
+ } else {
+ rc = -ERANGE;
+ goto out_xattr;
+ }
+ }
+ } else {
+getxattr_nocache:
+ oc = ll_mdscapa_get(inode);
+ rc = md_getxattr(sbi->ll_md_exp, ll_inode2fid(inode), oc,
+ valid | (rce ? rce_ops2valid(rce->rce_ops) : 0),
+ name, NULL, 0, size, 0, &req);
+ capa_put(oc);
+
+ if (rc < 0)
+ goto out_xattr;
+
+ body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
+ LASSERT(body);
+
+ /* only detect the xattr size */
+ if (size == 0) {
+ rc = body->eadatasize;
+ goto out;
+ }
+
+ if (size < body->eadatasize) {
+ CERROR("server bug: replied size %u > %u\n",
+ body->eadatasize, (int)size);
+ rc = -ERANGE;
+ goto out;
+ }
+
+ if (body->eadatasize == 0) {
+ rc = -ENODATA;
+ goto out;
+ }
+
+ /* do not need swab xattr data */
+ xdata = req_capsule_server_sized_get(&req->rq_pill, &RMF_EADATA,
+ body->eadatasize);
+ if (!xdata) {
+ rc = -EFAULT;
+ goto out;
+ }
+
+ memcpy(buffer, xdata, body->eadatasize);
+ rc = body->eadatasize;
+ }
+
+#ifdef CONFIG_FS_POSIX_ACL
+ if (rce && rce->rce_ops == RMT_LSETFACL) {
+ ext_acl_xattr_header *acl;
+
+ acl = lustre_posix_acl_xattr_2ext(
+ (posix_acl_xattr_header *)buffer, rc);
+ if (IS_ERR(acl)) {
+ rc = PTR_ERR(acl);
+ goto out;
+ }
+
+ rc = ee_add(&sbi->ll_et, current_pid(), ll_inode2fid(inode),
+ xattr_type, acl);
+ if (unlikely(rc < 0)) {
+ lustre_ext_acl_xattr_free(acl);
+ goto out;
+ }
+ }
+#endif
+
+out_xattr:
+ if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) {
+ LCONSOLE_INFO(
+ "%s: disabling user_xattr feature because it is not supported on the server: rc = %d\n",
+ ll_get_fsname(inode->i_sb, NULL, 0), rc);
+ sbi->ll_flags &= ~LL_SBI_USER_XATTR;
+ }
+out:
+ ptlrpc_req_finished(req);
+ return rc;
+}
+
+ssize_t ll_getxattr(struct dentry *dentry, const char *name,
+ void *buffer, size_t size)
+{
+ struct inode *inode = d_inode(dentry);
+
+ LASSERT(inode);
+ LASSERT(name);
+
+ CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n",
+ inode->i_ino, inode->i_generation, inode, name);
+
+ ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_GETXATTR, 1);
+
+ if ((strncmp(name, XATTR_TRUSTED_PREFIX,
+ sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 &&
+ strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) ||
+ (strncmp(name, XATTR_LUSTRE_PREFIX,
+ sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 &&
+ strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) {
+ struct lov_stripe_md *lsm;
+ struct lov_user_md *lump;
+ struct lov_mds_md *lmm = NULL;
+ struct ptlrpc_request *request = NULL;
+ int rc = 0, lmmsize = 0;
+
+ if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
+ return -ENODATA;
+
+ if (size == 0 && S_ISDIR(inode->i_mode)) {
+ /* XXX directory EA is fix for now, optimize to save
+ * RPC transfer */
+ rc = sizeof(struct lov_user_md);
+ goto out;
+ }
+
+ lsm = ccc_inode_lsm_get(inode);
+ if (lsm == NULL) {
+ if (S_ISDIR(inode->i_mode)) {
+ rc = ll_dir_getstripe(inode, &lmm,
+ &lmmsize, &request);
+ } else {
+ rc = -ENODATA;
+ }
+ } else {
+ /* LSM is present already after lookup/getattr call.
+ * we need to grab layout lock once it is implemented */
+ rc = obd_packmd(ll_i2dtexp(inode), &lmm, lsm);
+ lmmsize = rc;
+ }
+ ccc_inode_lsm_put(inode, lsm);
+
+ if (rc < 0)
+ goto out;
+
+ if (size == 0) {
+ /* used to call ll_get_max_mdsize() forward to get
+ * the maximum buffer size, while some apps (such as
+ * rsync 3.0.x) care much about the exact xattr value
+ * size */
+ rc = lmmsize;
+ goto out;
+ }
+
+ if (size < lmmsize) {
+ CERROR("server bug: replied size %d > %d for %pd (%s)\n",
+ lmmsize, (int)size, dentry, name);
+ rc = -ERANGE;
+ goto out;
+ }
+
+ lump = (struct lov_user_md *)buffer;
+ memcpy(lump, lmm, lmmsize);
+ /* do not return layout gen for getxattr otherwise it would
+ * confuse tar --xattr by recognizing layout gen as stripe
+ * offset when the file is restored. See LU-2809. */
+ lump->lmm_layout_gen = 0;
+
+ rc = lmmsize;
+out:
+ if (request)
+ ptlrpc_req_finished(request);
+ else if (lmm)
+ obd_free_diskmd(ll_i2dtexp(inode), &lmm);
+ return rc;
+ }
+
+ return ll_getxattr_common(inode, name, buffer, size, OBD_MD_FLXATTR);
+}
+
+ssize_t ll_listxattr(struct dentry *dentry, char *buffer, size_t size)
+{
+ struct inode *inode = d_inode(dentry);
+ int rc = 0, rc2 = 0;
+ struct lov_mds_md *lmm = NULL;
+ struct ptlrpc_request *request = NULL;
+ int lmmsize;
+
+ LASSERT(inode);
+
+ CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n",
+ inode->i_ino, inode->i_generation, inode);
+
+ ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_LISTXATTR, 1);
+
+ rc = ll_getxattr_common(inode, NULL, buffer, size, OBD_MD_FLXATTRLS);
+ if (rc < 0)
+ goto out;
+
+ if (buffer != NULL) {
+ struct ll_sb_info *sbi = ll_i2sbi(inode);
+ char *xattr_name = buffer;
+ int xlen, rem = rc;
+
+ while (rem > 0) {
+ xlen = strnlen(xattr_name, rem - 1) + 1;
+ rem -= xlen;
+ if (xattr_type_filter(sbi,
+ get_xattr_type(xattr_name)) == 0) {
+ /* skip OK xattr type
+ * leave it in buffer
+ */
+ xattr_name += xlen;
+ continue;
+ }
+ /* move up remaining xattrs in buffer
+ * removing the xattr that is not OK
+ */
+ memmove(xattr_name, xattr_name + xlen, rem);
+ rc -= xlen;
+ }
+ }
+ if (S_ISREG(inode->i_mode)) {
+ if (!ll_i2info(inode)->lli_has_smd)
+ rc2 = -1;
+ } else if (S_ISDIR(inode->i_mode)) {
+ rc2 = ll_dir_getstripe(inode, &lmm, &lmmsize, &request);
+ }
+
+ if (rc2 < 0) {
+ rc2 = 0;
+ goto out;
+ } else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) {
+ const int prefix_len = sizeof(XATTR_LUSTRE_PREFIX) - 1;
+ const size_t name_len = sizeof("lov") - 1;
+ const size_t total_len = prefix_len + name_len + 1;
+
+ if (((rc + total_len) > size) && (buffer != NULL)) {
+ ptlrpc_req_finished(request);
+ return -ERANGE;
+ }
+
+ if (buffer != NULL) {
+ buffer += rc;
+ memcpy(buffer, XATTR_LUSTRE_PREFIX, prefix_len);
+ memcpy(buffer + prefix_len, "lov", name_len);
+ buffer[prefix_len + name_len] = '\0';
+ }
+ rc2 = total_len;
+ }
+out:
+ ptlrpc_req_finished(request);
+ rc = rc + rc2;
+
+ return rc;
+}
Code Review / kvmfornfv.git / blobdiff