1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2001, 2002, 2003, 2004 Cluster File Systems, Inc.
6 * Author: <braam@clusterfs.com>
8 * This file is part of Lustre, http://www.lustre.org.
10 * Lustre is free software; you can redistribute it and/or
11 * modify it under the terms of version 2 of the GNU General Public
12 * License as published by the Free Software Foundation.
14 * Lustre is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with Lustre; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * lustre VFS/process permission interface
29 #include <libcfs/kp30.h>
31 #define LL_ID_NAMELEN (16 + 1 + 8 + 1)
33 #if defined __KERNEL__
34 #include <linux/dcache.h>
35 #include <linux/namei.h>
36 #include <linux/lustre_compat25.h>
37 #include <linux/lvfs_linux.h>
41 #include <lvfs_user_fs.h>
44 struct mds_grp_hash_entry;
48 struct lustre_sec_desc *luc_lsd;
49 struct group_info *luc_ginfo;
59 struct lvfs_callback_ops {
60 struct dentry *(*l_id2dentry)(__u64 ino, __u32 gen,
61 __u64 gr, void *data);
64 #define OBD_RUN_CTXT_MAGIC 0xC0FFEEAA
65 #define OBD_CTXT_DEBUG /* development-only debugging */
66 struct lvfs_run_ctxt {
67 struct vfsmount *pwdmnt;
70 struct lvfs_ucred luc;
71 struct lvfs_callback_ops cb_ops;
73 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,4)
74 struct group_info *group_info;
76 struct group_info group_info;
84 struct lvfs_obd_ctxt {
85 struct vfsmount *loc_mnt;
86 atomic_t loc_refcount;
88 struct list_head loc_list;
92 #define OBD_SET_CTXT_MAGIC(ctxt) (ctxt)->magic = OBD_RUN_CTXT_MAGIC
94 #define OBD_SET_CTXT_MAGIC(ctxt) do {} while(0)
98 struct dentry *lvfs_id2dentry(struct lvfs_run_ctxt *, __u64,
99 __u32, __u64 ,void *data);
101 void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx,
102 struct lvfs_ucred *cred);
103 void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx,
104 struct lvfs_ucred *cred);
107 int lvfs_reint(struct super_block *sb, void *r_rec);
108 int lvfs_undo(struct super_block *sb, void *r_rec);
109 struct dentry *simple_mkdir(struct dentry *dir, char *name, int mode, int fix);
110 struct dentry *simple_mknod(struct dentry *dir, char *name, int mode, int fix);
111 int lustre_fread(struct file *file, void *buf, int len, loff_t *off);
112 int lustre_fwrite(struct file *file, const void *buf, int len, loff_t *off);
113 int lustre_fsync(struct file *file);
114 long l_readdir(struct file * file, struct list_head *dentry_list);
115 int lvfs_mount_fs(char *name, char *fstype, char *options, int flags,
116 struct lvfs_obd_ctxt **lvfs_ctxt);
117 void lvfs_umount_fs(struct lvfs_obd_ctxt *lvfs_ctxt);
118 static inline void l_dput(struct dentry *de)
120 if (!de || IS_ERR(de))
122 //shrink_dcache_parent(de);
123 LASSERT(atomic_read(&de->d_count) > 0);
128 void *lock_dir(struct inode *dir, struct qstr *name);
129 void unlock_dir(struct inode *dir, void *lock);
133 * typeof here is to suppress gcc warnings (gcc4, maybe others too) about wrong
134 * type in assignment. As kernel type may be chnaged we doing it this way.
137 #define qstr_assign(qstr, n, l) \
139 typeof(l) _len = (l); \
140 typeof(n) _name = (n); \
141 (qstr)->name = (typeof((qstr)->name))_name; \
142 (qstr)->len = (typeof((qstr)->len))_len; \
145 /* We need to hold the inode semaphore over the dcache lookup itself, or we run
146 * the risk of entering the filesystem lookup path concurrently on SMP systems,
147 * and instantiating two inodes for the same entry. We still protect against
148 * concurrent addition/removal races with the DLM locking. */
149 static inline struct dentry *
150 ll_lookup_one_len(const char *name, struct dentry *dparent, int namelen)
152 struct dentry *dchild;
158 qstr_assign(&qstr, name, namelen);
159 lock = lock_dir(dparent->d_inode, &qstr);
161 down(&dparent->d_inode->i_sem);
164 dchild = lookup_one_len(name, dparent, namelen);
167 unlock_dir(dparent->d_inode, lock);
169 up(&dparent->d_inode->i_sem);
172 if (IS_ERR(dchild) || dchild->d_inode == NULL)
175 if (is_bad_inode(dchild->d_inode)) {
176 CERROR("bad inode returned %lu/%u\n",
177 dchild->d_inode->i_ino, dchild->d_inode->i_generation);
179 dchild = ERR_PTR(-ENOENT);
185 static inline void ll_sleep(int t)
187 set_current_state(TASK_INTERRUPTIBLE);
188 schedule_timeout(t * HZ);
189 set_current_state(TASK_RUNNING);
193 static inline int ll_id2str(char *str, __u64 id, __u32 generation)
195 return sprintf(str, "%llx:%08x", (unsigned long long)id,