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).
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19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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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 <lustre_quota.h>
50 #include <linux/mount.h>
51 #include <lustre_mds.h>
52 #include <obd_class.h>
53 #include <obd_support.h>
54 #include <lustre_lib.h>
55 #include <lustre_fsfilt.h>
56 #include <lustre_disk.h>
57 #include <libcfs/list.h>
59 #include "mds_internal.h"
62 /* Creates an object with the same name as its fid. Because this is not at all
63 * performance sensitive, it is accomplished by creating a file, checking the
64 * fid, and renaming it. */
65 int mds_obd_create(struct obd_export *exp, struct obdo *oa,
66 struct lov_stripe_md **ea, struct obd_trans_info *oti)
68 struct mds_obd *mds = &exp->exp_obd->u.mds;
69 struct inode *parent_inode = mds->mds_objects_dir->d_inode;
70 unsigned int tmpname = ll_rand();
72 struct dentry *new_child;
73 struct lvfs_run_ctxt saved;
74 char fidname[LL_FID_NAMELEN];
76 struct lvfs_ucred ucred = { 0 };
77 int rc = 0, err, namelen;
80 /* the owner of object file should always be root */
81 cap_raise(ucred.luc_cap, CAP_SYS_RESOURCE);
83 if (strncmp(exp->exp_obd->obd_name, MDD_OBD_NAME,
84 strlen(MDD_OBD_NAME))) {
88 push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, &ucred);
90 sprintf(fidname, "OBJECTS/%u.%u", tmpname, current->pid);
91 filp = filp_open(fidname, O_CREAT | O_EXCL, 0666);
95 CERROR("impossible object name collision %u\n",
99 CERROR("error creating tmp object %u: rc %d\n", tmpname, rc);
103 LASSERT(mds->mds_objects_dir == filp->f_dentry->d_parent);
105 oa->o_id = filp->f_dentry->d_inode->i_ino;
106 oa->o_generation = filp->f_dentry->d_inode->i_generation;
107 namelen = ll_fid2str(fidname, oa->o_id, oa->o_generation);
109 LOCK_INODE_MUTEX(parent_inode);
110 new_child = lookup_one_len(fidname, mds->mds_objects_dir, namelen);
112 if (IS_ERR(new_child)) {
113 CERROR("getting neg dentry for obj rename: %d\n", rc);
114 GOTO(out_close, rc = PTR_ERR(new_child));
116 if (new_child->d_inode != NULL) {
117 CERROR("impossible non-negative obj dentry " LPU64":%u!\n",
118 oa->o_id, oa->o_generation);
122 handle = fsfilt_start(exp->exp_obd, mds->mds_objects_dir->d_inode,
123 FSFILT_OP_RENAME, NULL);
125 GOTO(out_dput, rc = PTR_ERR(handle));
128 rc = ll_vfs_rename(mds->mds_objects_dir->d_inode, filp->f_dentry,
129 filp->f_vfsmnt, mds->mds_objects_dir->d_inode,
130 new_child, filp->f_vfsmnt);
133 CERROR("error renaming new object "LPU64":%u: rc %d\n",
134 oa->o_id, oa->o_generation, rc);
136 err = fsfilt_commit(exp->exp_obd, mds->mds_objects_dir->d_inode,
139 oa->o_gr = FILTER_GROUP_MDS0 + mds->mds_id;
140 oa->o_valid |= OBD_MD_FLID | OBD_MD_FLGENER | OBD_MD_FLGROUP;
146 UNLOCK_INODE_MUTEX(parent_inode);
147 err = filp_close(filp, 0);
149 CERROR("closing tmpfile %u: rc %d\n", tmpname, rc);
154 pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, &ucred);
158 int mds_obd_destroy(struct obd_export *exp, struct obdo *oa,
159 struct lov_stripe_md *ea, struct obd_trans_info *oti,
160 struct obd_export *md_exp)
162 struct mds_obd *mds = &exp->exp_obd->u.mds;
163 struct inode *parent_inode = mds->mds_objects_dir->d_inode;
164 struct obd_device *obd = exp->exp_obd;
165 struct lvfs_run_ctxt saved;
166 struct lvfs_ucred ucred = { 0 };
167 char fidname[LL_FID_NAMELEN];
168 struct inode *inode = NULL;
171 int err, namelen, rc = 0;
174 cap_raise(ucred.luc_cap, CAP_SYS_RESOURCE);
175 push_ctxt(&saved, &obd->obd_lvfs_ctxt, &ucred);
177 namelen = ll_fid2str(fidname, oa->o_id, oa->o_generation);
179 LOCK_INODE_MUTEX(parent_inode);
180 de = lookup_one_len(fidname, mds->mds_objects_dir, namelen);
184 CERROR("error looking up object "LPU64" %s: rc %d\n",
185 oa->o_id, fidname, rc);
188 if (de->d_inode == NULL) {
189 CERROR("destroying non-existent object "LPU64" %s: rc %d\n",
190 oa->o_id, fidname, rc);
191 GOTO(out_dput, rc = -ENOENT);
194 /* Stripe count is 1 here since this is some MDS specific stuff
195 that is unlinked, not spanned across multiple OSTs */
196 handle = fsfilt_start_log(obd, mds->mds_objects_dir->d_inode,
197 FSFILT_OP_UNLINK, oti, 1);
200 GOTO(out_dput, rc = PTR_ERR(handle));
202 /* take a reference to protect inode from truncation within
203 vfs_unlink() context. bug 10409 */
205 atomic_inc(&inode->i_count);
206 rc = ll_vfs_unlink(mds->mds_objects_dir->d_inode, de, mds->mds_vfsmnt);
208 CERROR("error destroying object "LPU64":%u: rc %d\n",
209 oa->o_id, oa->o_generation, rc);
211 err = fsfilt_commit(obd, mds->mds_objects_dir->d_inode, handle, 0);
217 UNLOCK_INODE_MUTEX(parent_inode);
222 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, &ucred);