drivers/staging/lustre/lustre/include/linux/lvfs.h

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   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.
   9  *
  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).
  15  *
  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
  19  *
  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
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/include/linux/lvfs.h
  37  *
  38  * lustre VFS/process permission interface
  39  */
  40
  41 #ifndef __LINUX_LVFS_H__
  42 #define __LINUX_LVFS_H__
  43
  44 #ifndef __LVFS_H__
  45 #error Do not #include this file directly. #include <lvfs.h> instead
  46 #endif
  47
  48 #include <linux/kernel.h>
  49 #include <linux/fs.h>
  50 #include <linux/sched.h>
  51 #include "lustre_compat25.h"
  52
  53 #define LLOG_LVFS
  54
  55 /* simple.c */
  56
  57 struct lvfs_ucred {
  58         kuid_t          luc_uid;
  59         kgid_t          luc_gid;
  60         kuid_t          luc_fsuid;
  61         kgid_t          luc_fsgid;
  62         kernel_cap_t    luc_cap;
  63         __u32              luc_umask;
  64         struct group_info      *luc_ginfo;
  65         struct md_identity     *luc_identity;
  66 };
  67
  68 struct lvfs_callback_ops {
  69         struct dentry *(*l_fid2dentry)(__u64 id_ino, __u32 gen, __u64 gr, void *data);
  70 };
  71
  72 #define OBD_RUN_CTXT_MAGIC      0xC0FFEEAA
  73 #define OBD_CTXT_DEBUG    /* development-only debugging */
  74 struct lvfs_run_ctxt {
  75         struct vfsmount  *pwdmnt;
  76         struct dentry      *pwd;
  77         mm_segment_t         fs;
  78         struct lvfs_ucred       luc;
  79         int                   ngroups;
  80         struct lvfs_callback_ops cb_ops;
  81         struct group_info       *group_info;
  82         struct dt_device        *dt;
  83 #ifdef OBD_CTXT_DEBUG
  84         __u32               magic;
  85 #endif
  86 };
  87
  88 #ifdef OBD_CTXT_DEBUG
  89 #define OBD_SET_CTXT_MAGIC(ctxt) (ctxt)->magic = OBD_RUN_CTXT_MAGIC
  90 #else
  91 #define OBD_SET_CTXT_MAGIC(ctxt) do {} while (0)
  92 #endif
  93
  94
  95 int lustre_rename(struct dentry *dir, struct vfsmount *mnt, char *oldname,
  96                   char *newname);
  97
  98 static inline void l_dput(struct dentry *de)
  99 {
 100         if (!de || IS_ERR(de))
 101                 return;
 102         //shrink_dcache_parent(de);
 103         LASSERT(d_count(de) > 0);
 104         dput(de);
 105 }
 106
 107 /* We need to hold the inode semaphore over the dcache lookup itself, or we
 108  * run the risk of entering the filesystem lookup path concurrently on SMP
 109  * systems, and instantiating two inodes for the same entry.  We still
 110  * protect against concurrent addition/removal races with the DLM locking.
 111  */
 112 static inline struct dentry *ll_lookup_one_len(const char *fid_name,
 113                                                struct dentry *dparent,
 114                                                int fid_namelen)
 115 {
 116         struct dentry *dchild;
 117
 118         mutex_lock(&dparent->d_inode->i_mutex);
 119         dchild = lookup_one_len(fid_name, dparent, fid_namelen);
 120         mutex_unlock(&dparent->d_inode->i_mutex);
 121
 122         if (IS_ERR(dchild) || dchild->d_inode == NULL)
 123                 return dchild;
 124
 125         if (is_bad_inode(dchild->d_inode)) {
 126                 CERROR("bad inode returned %lu/%u\n",
 127                        dchild->d_inode->i_ino, dchild->d_inode->i_generation);
 128                 dput(dchild);
 129                 dchild = ERR_PTR(-ENOENT);
 130         }
 131         return dchild;
 132 }
 133
 134
 135 #endif