325 lines
7.9 KiB
C
325 lines
7.9 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* lustre/llite/remote_perm.c
|
|
*
|
|
* Lustre Permission Cache for Remote Client
|
|
*
|
|
* Author: Lai Siyao <lsy@clusterfs.com>
|
|
* Author: Fan Yong <fanyong@clusterfs.com>
|
|
*/
|
|
|
|
#define DEBUG_SUBSYSTEM S_LLITE
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
|
|
#include "../include/lustre_lite.h"
|
|
#include "../include/lustre_ha.h"
|
|
#include "../include/lustre_dlm.h"
|
|
#include "../include/lprocfs_status.h"
|
|
#include "../include/lustre_disk.h"
|
|
#include "../include/lustre_param.h"
|
|
#include "llite_internal.h"
|
|
|
|
struct kmem_cache *ll_remote_perm_cachep;
|
|
struct kmem_cache *ll_rmtperm_hash_cachep;
|
|
|
|
static inline struct ll_remote_perm *alloc_ll_remote_perm(void)
|
|
{
|
|
struct ll_remote_perm *lrp;
|
|
|
|
lrp = kmem_cache_zalloc(ll_remote_perm_cachep, GFP_KERNEL);
|
|
if (lrp)
|
|
INIT_HLIST_NODE(&lrp->lrp_list);
|
|
return lrp;
|
|
}
|
|
|
|
static inline void free_ll_remote_perm(struct ll_remote_perm *lrp)
|
|
{
|
|
if (!lrp)
|
|
return;
|
|
|
|
if (!hlist_unhashed(&lrp->lrp_list))
|
|
hlist_del(&lrp->lrp_list);
|
|
kmem_cache_free(ll_remote_perm_cachep, lrp);
|
|
}
|
|
|
|
static struct hlist_head *alloc_rmtperm_hash(void)
|
|
{
|
|
struct hlist_head *hash;
|
|
int i;
|
|
|
|
hash = kmem_cache_zalloc(ll_rmtperm_hash_cachep, GFP_NOFS);
|
|
if (!hash)
|
|
return NULL;
|
|
|
|
for (i = 0; i < REMOTE_PERM_HASHSIZE; i++)
|
|
INIT_HLIST_HEAD(hash + i);
|
|
|
|
return hash;
|
|
}
|
|
|
|
void free_rmtperm_hash(struct hlist_head *hash)
|
|
{
|
|
int i;
|
|
struct ll_remote_perm *lrp;
|
|
struct hlist_node *next;
|
|
|
|
if (!hash)
|
|
return;
|
|
|
|
for (i = 0; i < REMOTE_PERM_HASHSIZE; i++)
|
|
hlist_for_each_entry_safe(lrp, next, hash + i, lrp_list)
|
|
free_ll_remote_perm(lrp);
|
|
kmem_cache_free(ll_rmtperm_hash_cachep, hash);
|
|
}
|
|
|
|
static inline int remote_perm_hashfunc(uid_t uid)
|
|
{
|
|
return uid & (REMOTE_PERM_HASHSIZE - 1);
|
|
}
|
|
|
|
/* NB: setxid permission is not checked here, instead it's done on
|
|
* MDT when client get remote permission.
|
|
*/
|
|
static int do_check_remote_perm(struct ll_inode_info *lli, int mask)
|
|
{
|
|
struct hlist_head *head;
|
|
struct ll_remote_perm *lrp;
|
|
int found = 0, rc;
|
|
|
|
if (!lli->lli_remote_perms)
|
|
return -ENOENT;
|
|
|
|
head = lli->lli_remote_perms +
|
|
remote_perm_hashfunc(from_kuid(&init_user_ns, current_uid()));
|
|
|
|
spin_lock(&lli->lli_lock);
|
|
hlist_for_each_entry(lrp, head, lrp_list) {
|
|
if (lrp->lrp_uid != from_kuid(&init_user_ns, current_uid()))
|
|
continue;
|
|
if (lrp->lrp_gid != from_kgid(&init_user_ns, current_gid()))
|
|
continue;
|
|
if (lrp->lrp_fsuid != from_kuid(&init_user_ns, current_fsuid()))
|
|
continue;
|
|
if (lrp->lrp_fsgid != from_kgid(&init_user_ns, current_fsgid()))
|
|
continue;
|
|
found = 1;
|
|
break;
|
|
}
|
|
|
|
if (!found) {
|
|
rc = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
CDEBUG(D_SEC, "found remote perm: %u/%u/%u/%u - %#x\n",
|
|
lrp->lrp_uid, lrp->lrp_gid, lrp->lrp_fsuid, lrp->lrp_fsgid,
|
|
lrp->lrp_access_perm);
|
|
rc = ((lrp->lrp_access_perm & mask) == mask) ? 0 : -EACCES;
|
|
|
|
out:
|
|
spin_unlock(&lli->lli_lock);
|
|
return rc;
|
|
}
|
|
|
|
int ll_update_remote_perm(struct inode *inode, struct mdt_remote_perm *perm)
|
|
{
|
|
struct ll_inode_info *lli = ll_i2info(inode);
|
|
struct ll_remote_perm *lrp = NULL, *tmp = NULL;
|
|
struct hlist_head *head, *perm_hash = NULL;
|
|
|
|
LASSERT(ll_i2sbi(inode)->ll_flags & LL_SBI_RMT_CLIENT);
|
|
|
|
#if 0
|
|
if (perm->rp_uid != current->uid ||
|
|
perm->rp_gid != current->gid ||
|
|
perm->rp_fsuid != current->fsuid ||
|
|
perm->rp_fsgid != current->fsgid) {
|
|
/* user might setxid in this small period */
|
|
CDEBUG(D_SEC,
|
|
"remote perm user %u/%u/%u/%u != current %u/%u/%u/%u\n",
|
|
perm->rp_uid, perm->rp_gid, perm->rp_fsuid,
|
|
perm->rp_fsgid, current->uid, current->gid,
|
|
current->fsuid, current->fsgid);
|
|
return -EAGAIN;
|
|
}
|
|
#endif
|
|
|
|
if (!lli->lli_remote_perms) {
|
|
perm_hash = alloc_rmtperm_hash();
|
|
if (!perm_hash) {
|
|
CERROR("alloc lli_remote_perms failed!\n");
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
spin_lock(&lli->lli_lock);
|
|
|
|
if (!lli->lli_remote_perms)
|
|
lli->lli_remote_perms = perm_hash;
|
|
else
|
|
free_rmtperm_hash(perm_hash);
|
|
|
|
head = lli->lli_remote_perms + remote_perm_hashfunc(perm->rp_uid);
|
|
|
|
again:
|
|
hlist_for_each_entry(tmp, head, lrp_list) {
|
|
if (tmp->lrp_uid != perm->rp_uid)
|
|
continue;
|
|
if (tmp->lrp_gid != perm->rp_gid)
|
|
continue;
|
|
if (tmp->lrp_fsuid != perm->rp_fsuid)
|
|
continue;
|
|
if (tmp->lrp_fsgid != perm->rp_fsgid)
|
|
continue;
|
|
free_ll_remote_perm(lrp);
|
|
lrp = tmp;
|
|
break;
|
|
}
|
|
|
|
if (!lrp) {
|
|
spin_unlock(&lli->lli_lock);
|
|
lrp = alloc_ll_remote_perm();
|
|
if (!lrp) {
|
|
CERROR("alloc memory for ll_remote_perm failed!\n");
|
|
return -ENOMEM;
|
|
}
|
|
spin_lock(&lli->lli_lock);
|
|
goto again;
|
|
}
|
|
|
|
lrp->lrp_access_perm = perm->rp_access_perm;
|
|
if (lrp != tmp) {
|
|
lrp->lrp_uid = perm->rp_uid;
|
|
lrp->lrp_gid = perm->rp_gid;
|
|
lrp->lrp_fsuid = perm->rp_fsuid;
|
|
lrp->lrp_fsgid = perm->rp_fsgid;
|
|
hlist_add_head(&lrp->lrp_list, head);
|
|
}
|
|
lli->lli_rmtperm_time = cfs_time_current();
|
|
spin_unlock(&lli->lli_lock);
|
|
|
|
CDEBUG(D_SEC, "new remote perm@%p: %u/%u/%u/%u - %#x\n",
|
|
lrp, lrp->lrp_uid, lrp->lrp_gid, lrp->lrp_fsuid, lrp->lrp_fsgid,
|
|
lrp->lrp_access_perm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int lustre_check_remote_perm(struct inode *inode, int mask)
|
|
{
|
|
struct ll_inode_info *lli = ll_i2info(inode);
|
|
struct ll_sb_info *sbi = ll_i2sbi(inode);
|
|
struct ptlrpc_request *req = NULL;
|
|
struct mdt_remote_perm *perm;
|
|
unsigned long save;
|
|
int i = 0, rc;
|
|
|
|
do {
|
|
save = lli->lli_rmtperm_time;
|
|
rc = do_check_remote_perm(lli, mask);
|
|
if (!rc || (rc != -ENOENT && i))
|
|
break;
|
|
|
|
might_sleep();
|
|
|
|
mutex_lock(&lli->lli_rmtperm_mutex);
|
|
/* check again */
|
|
if (save != lli->lli_rmtperm_time) {
|
|
rc = do_check_remote_perm(lli, mask);
|
|
if (!rc || (rc != -ENOENT && i)) {
|
|
mutex_unlock(&lli->lli_rmtperm_mutex);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i++ > 5) {
|
|
CERROR("check remote perm falls in dead loop!\n");
|
|
LBUG();
|
|
}
|
|
|
|
rc = md_get_remote_perm(sbi->ll_md_exp, ll_inode2fid(inode),
|
|
ll_i2suppgid(inode), &req);
|
|
if (rc) {
|
|
mutex_unlock(&lli->lli_rmtperm_mutex);
|
|
break;
|
|
}
|
|
|
|
perm = req_capsule_server_swab_get(&req->rq_pill, &RMF_ACL,
|
|
lustre_swab_mdt_remote_perm);
|
|
if (unlikely(!perm)) {
|
|
mutex_unlock(&lli->lli_rmtperm_mutex);
|
|
rc = -EPROTO;
|
|
break;
|
|
}
|
|
|
|
rc = ll_update_remote_perm(inode, perm);
|
|
mutex_unlock(&lli->lli_rmtperm_mutex);
|
|
if (rc == -ENOMEM)
|
|
break;
|
|
|
|
ptlrpc_req_finished(req);
|
|
req = NULL;
|
|
} while (1);
|
|
ptlrpc_req_finished(req);
|
|
return rc;
|
|
}
|
|
|
|
#if 0 /* NB: remote perms can't be freed in ll_mdc_blocking_ast of UPDATE lock,
|
|
* because it will fail sanity test 48.
|
|
*/
|
|
void ll_free_remote_perms(struct inode *inode)
|
|
{
|
|
struct ll_inode_info *lli = ll_i2info(inode);
|
|
struct hlist_head *hash = lli->lli_remote_perms;
|
|
struct ll_remote_perm *lrp;
|
|
struct hlist_node *node, *next;
|
|
int i;
|
|
|
|
LASSERT(hash);
|
|
|
|
spin_lock(&lli->lli_lock);
|
|
|
|
for (i = 0; i < REMOTE_PERM_HASHSIZE; i++) {
|
|
hlist_for_each_entry_safe(lrp, node, next, hash + i, lrp_list)
|
|
free_ll_remote_perm(lrp);
|
|
}
|
|
|
|
spin_unlock(&lli->lli_lock);
|
|
}
|
|
#endif
|