1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
38 * Lustre Metadata Server (MDS) filesystem interface code
40 * Author: Andreas Dilger <adilger@clusterfs.com>
43 #define DEBUG_SUBSYSTEM S_MDS
45 #include <linux/module.h>
46 #include <linux/kmod.h>
47 #include <linux/version.h>
48 #include <linux/sched.h>
49 #include <linux/mount.h>
50 #include <lustre_mds.h>
51 #include <obd_class.h>
52 #include <obd_support.h>
53 #include <lustre_lib.h>
54 #include <lustre_fsfilt.h>
55 #include <lustre_disk.h>
56 #include <libcfs/list.h>
58 #include "mds_internal.h"
61 /* Creates an object with the same name as its fid. Because this is not at all
62 * performance sensitive, it is accomplished by creating a file, checking the
63 * fid, and renaming it. */
64 int mds_obd_create(struct obd_export *exp, struct obdo *oa,
65 struct lov_stripe_md **ea, struct obd_trans_info *oti)
67 struct mds_obd *mds = &exp->exp_obd->u.mds;
68 struct inode *parent_inode = mds->mds_objects_dir->d_inode;
69 unsigned int tmpname = ll_rand();
71 struct dentry *new_child;
72 struct lvfs_run_ctxt saved;
73 char fidname[LL_FID_NAMELEN];
75 struct lvfs_ucred ucred = { 0 };
76 int rc = 0, err, namelen;
79 /* the owner of object file should always be root */
80 cap_raise(ucred.luc_cap, CAP_SYS_RESOURCE);
82 if (strncmp(exp->exp_obd->obd_name, MDD_OBD_NAME,
83 strlen(MDD_OBD_NAME))) {
87 push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, &ucred);
89 sprintf(fidname, "OBJECTS/%u.%u", tmpname, current->pid);
90 filp = filp_open(fidname, O_CREAT | O_EXCL, 0666);
94 CERROR("impossible object name collision %u\n",
98 CERROR("error creating tmp object %u: rc %d\n", tmpname, rc);
102 LASSERT(mds->mds_objects_dir == filp->f_dentry->d_parent);
104 oa->o_id = filp->f_dentry->d_inode->i_ino;
105 oa->o_generation = filp->f_dentry->d_inode->i_generation;
106 namelen = ll_fid2str(fidname, oa->o_id, oa->o_generation);
108 LOCK_INODE_MUTEX_PARENT(parent_inode);
109 new_child = lookup_one_len(fidname, mds->mds_objects_dir, namelen);
111 if (IS_ERR(new_child)) {
112 CERROR("getting neg dentry for obj rename: %d\n", rc);
113 GOTO(out_close, rc = PTR_ERR(new_child));
115 if (new_child->d_inode != NULL) {
116 CERROR("impossible non-negative obj dentry " LPU64":%u!\n",
117 oa->o_id, oa->o_generation);
121 handle = fsfilt_start(exp->exp_obd, mds->mds_objects_dir->d_inode,
122 FSFILT_OP_RENAME, NULL);
124 GOTO(out_dput, rc = PTR_ERR(handle));
126 rc = ll_vfs_rename(mds->mds_objects_dir->d_inode, filp->f_dentry,
127 filp->f_vfsmnt, mds->mds_objects_dir->d_inode,
128 new_child, filp->f_vfsmnt);
131 CERROR("error renaming new object "LPU64":%u: rc %d\n",
132 oa->o_id, oa->o_generation, rc);
134 err = fsfilt_commit(exp->exp_obd, mds->mds_objects_dir->d_inode,
137 oa->o_gr = mdt_to_obd_objgrp(mds->mds_id);
138 oa->o_valid |= OBD_MD_FLID | OBD_MD_FLGENER | OBD_MD_FLGROUP;
144 UNLOCK_INODE_MUTEX(parent_inode);
145 err = filp_close(filp, 0);
147 CERROR("closing tmpfile %u: rc %d\n", tmpname, rc);
152 pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, &ucred);
156 int mds_obd_destroy(struct obd_export *exp, struct obdo *oa,
157 struct lov_stripe_md *ea, struct obd_trans_info *oti,
158 struct obd_export *md_exp, void *capa)
160 struct mds_obd *mds = &exp->exp_obd->u.mds;
161 struct inode *parent_inode = mds->mds_objects_dir->d_inode;
162 struct obd_device *obd = exp->exp_obd;
163 struct lvfs_run_ctxt saved;
164 struct lvfs_ucred ucred = { 0 };
165 char fidname[LL_FID_NAMELEN];
166 struct inode *inode = NULL;
169 int err, namelen, rc = 0;
172 cap_raise(ucred.luc_cap, CAP_SYS_RESOURCE);
173 push_ctxt(&saved, &obd->obd_lvfs_ctxt, &ucred);
175 namelen = ll_fid2str(fidname, oa->o_id, oa->o_generation);
177 LOCK_INODE_MUTEX_PARENT(parent_inode);
178 de = lookup_one_len(fidname, mds->mds_objects_dir, namelen);
182 CERROR("error looking up object "LPU64" %s: rc %d\n",
183 oa->o_id, fidname, rc);
186 if (de->d_inode == NULL) {
187 CERROR("destroying non-existent object "LPU64" %s: rc %d\n",
188 oa->o_id, fidname, rc);
189 GOTO(out_dput, rc = -ENOENT);
192 /* Stripe count is 1 here since this is some MDS specific stuff
193 that is unlinked, not spanned across multiple OSTs */
194 handle = fsfilt_start_log(obd, mds->mds_objects_dir->d_inode,
195 FSFILT_OP_UNLINK, oti, 1);
198 GOTO(out_dput, rc = PTR_ERR(handle));
200 /* take a reference to protect inode from truncation within
201 vfs_unlink() context. bug 10409 */
203 atomic_inc(&inode->i_count);
204 rc = ll_vfs_unlink(mds->mds_objects_dir->d_inode, de, mds->mds_vfsmnt);
206 CERROR("error destroying object "LPU64":%u: rc %d\n",
207 oa->o_id, oa->o_generation, rc);
209 err = fsfilt_commit(obd, mds->mds_objects_dir->d_inode, handle, 0);
215 UNLOCK_INODE_MUTEX(parent_inode);
220 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, &ucred);