4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2013, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/lvfs/lvfs_linux.c
38 * Author: Andreas Dilger <adilger@clusterfs.com>
41 #define DEBUG_SUBSYSTEM S_FILTER
43 #include <linux/version.h>
45 #include <asm/unistd.h>
46 #include <linux/slab.h>
47 #include <linux/pagemap.h>
48 #include <linux/quotaops.h>
49 #include <linux/version.h>
50 #include <libcfs/libcfs.h>
52 #include <linux/module.h>
53 #include <linux/init.h>
54 #include <linux/lustre_compat25.h>
58 #include <lustre_lib.h>
60 struct lprocfs_stats *obd_memory = NULL;
61 EXPORT_SYMBOL(obd_memory);
62 /* refine later and change to seqlock or simlar from libcfs */
64 /* Debugging check only needed during development */
66 # define ASSERT_CTXT_MAGIC(magic) LASSERT((magic) == OBD_RUN_CTXT_MAGIC)
67 # define ASSERT_NOT_KERNEL_CTXT(msg) LASSERTF(!segment_eq(get_fs(), get_ds()),\
69 # define ASSERT_KERNEL_CTXT(msg) LASSERTF(segment_eq(get_fs(), get_ds()), msg)
71 # define ASSERT_CTXT_MAGIC(magic) do {} while(0)
72 # define ASSERT_NOT_KERNEL_CTXT(msg) do {} while(0)
73 # define ASSERT_KERNEL_CTXT(msg) do {} while(0)
76 static void push_group_info(struct lvfs_run_ctxt *save,
77 struct group_info *ginfo)
80 save->ngroups = current_ngroups;
85 save->group_info = current_cred()->group_info;
86 if ((cred = prepare_creds())) {
87 cred->group_info = ginfo;
94 static void pop_group_info(struct lvfs_run_ctxt *save,
95 struct group_info *ginfo)
98 current_ngroups = save->ngroups;
102 if ((cred = prepare_creds())) {
103 cred->group_info = save->group_info;
106 task_unlock(current);
110 /* push / pop to root of obd store */
111 void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx,
112 struct lvfs_ucred *uc)
114 /* if there is underlaying dt_device then push_ctxt is not needed */
115 if (new_ctx->dt != NULL)
118 //ASSERT_NOT_KERNEL_CTXT("already in kernel context!\n");
119 ASSERT_CTXT_MAGIC(new_ctx->magic);
120 OBD_SET_CTXT_MAGIC(save);
123 LASSERT(d_refcount(current->fs->pwd.dentry));
124 LASSERT(d_refcount(new_ctx->pwd));
125 save->pwd = dget(current->fs->pwd.dentry);
126 save->pwdmnt = mntget(current->fs->pwd.mnt);
127 save->luc.luc_umask = current_umask();
128 save->ngroups = current_cred()->group_info->ngroups;
131 LASSERT(save->pwdmnt);
132 LASSERT(new_ctx->pwd);
133 LASSERT(new_ctx->pwdmnt);
137 save->luc.luc_uid = current_uid();
138 save->luc.luc_gid = current_gid();
139 save->luc.luc_fsuid = current_fsuid();
140 save->luc.luc_fsgid = current_fsgid();
141 save->luc.luc_cap = current_cap();
143 if ((cred = prepare_creds())) {
144 cred->uid = uc->luc_uid;
145 cred->gid = uc->luc_gid;
146 cred->fsuid = uc->luc_fsuid;
147 cred->fsgid = uc->luc_fsgid;
148 cred->cap_effective = uc->luc_cap;
152 push_group_info(save,
154 uc->luc_identity ? uc->luc_identity->mi_ginfo :
157 current->fs->umask = 0; /* umask already applied on client */
159 ll_set_fs_pwd(current->fs, new_ctx->pwdmnt, new_ctx->pwd);
161 EXPORT_SYMBOL(push_ctxt);
163 void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx,
164 struct lvfs_ucred *uc)
166 /* if there is underlaying dt_device then pop_ctxt is not needed */
167 if (new_ctx->dt != NULL)
170 ASSERT_CTXT_MAGIC(saved->magic);
171 ASSERT_KERNEL_CTXT("popping non-kernel context!\n");
173 LASSERTF(current->fs->pwd.dentry == new_ctx->pwd, "%p != %p\n",
174 current->fs->pwd.dentry, new_ctx->pwd);
175 LASSERTF(current->fs->pwd.mnt == new_ctx->pwdmnt, "%p != %p\n",
176 current->fs->pwd.mnt, new_ctx->pwdmnt);
179 ll_set_fs_pwd(current->fs, saved->pwdmnt, saved->pwd);
182 mntput(saved->pwdmnt);
183 current->fs->umask = saved->luc.luc_umask;
186 if ((cred = prepare_creds())) {
187 cred->uid = saved->luc.luc_uid;
188 cred->gid = saved->luc.luc_gid;
189 cred->fsuid = saved->luc.luc_fsuid;
190 cred->fsgid = saved->luc.luc_fsgid;
191 cred->cap_effective = saved->luc.luc_cap;
195 pop_group_info(saved,
197 uc->luc_identity ? uc->luc_identity->mi_ginfo :
201 EXPORT_SYMBOL(pop_ctxt);
203 /* utility to rename a file */
204 int lustre_rename(struct dentry *dir, struct vfsmount *mnt,
205 char *oldname, char *newname)
207 struct dentry *dchild_old, *dchild_new;
211 ASSERT_KERNEL_CTXT("kernel doing rename outside kernel context\n");
212 CDEBUG(D_INODE, "renaming file %.*s to %.*s\n",
213 (int)strlen(oldname), oldname, (int)strlen(newname), newname);
215 dchild_old = ll_lookup_one_len(oldname, dir, strlen(oldname));
216 if (IS_ERR(dchild_old))
217 RETURN(PTR_ERR(dchild_old));
219 if (!dchild_old->d_inode)
220 GOTO(put_old, err = -ENOENT);
222 dchild_new = ll_lookup_one_len(newname, dir, strlen(newname));
223 if (IS_ERR(dchild_new))
224 GOTO(put_old, err = PTR_ERR(dchild_new));
226 err = vfs_rename(dir->d_inode, dchild_old, dir->d_inode, dchild_new);
233 EXPORT_SYMBOL(lustre_rename);
235 /* Note: dput(dchild) will *not* be called if there is an error */
236 struct l_file *l_dentry_open(struct lvfs_run_ctxt *ctxt, struct l_dentry *de,
243 return ll_dentry_open(&path, flags, current_cred());
245 EXPORT_SYMBOL(l_dentry_open);
248 __s64 lprocfs_read_helper(struct lprocfs_counter *lc,
249 struct lprocfs_counter_header *header,
250 enum lprocfs_stats_flags flags,
251 enum lprocfs_fields_flags field)
255 if (lc == NULL || header == NULL)
259 case LPROCFS_FIELDS_FLAGS_CONFIG:
260 ret = header->lc_config;
262 case LPROCFS_FIELDS_FLAGS_SUM:
264 if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
265 ret += lc->lc_sum_irq;
267 case LPROCFS_FIELDS_FLAGS_MIN:
270 case LPROCFS_FIELDS_FLAGS_MAX:
273 case LPROCFS_FIELDS_FLAGS_AVG:
274 ret = (lc->lc_max - lc->lc_min) / 2;
276 case LPROCFS_FIELDS_FLAGS_SUMSQUARE:
277 ret = lc->lc_sumsquare;
279 case LPROCFS_FIELDS_FLAGS_COUNT:
288 EXPORT_SYMBOL(lprocfs_read_helper);
291 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
292 MODULE_DESCRIPTION("Lustre VFS Filesystem Helper v0.1");
293 MODULE_LICENSE("GPL");