Linux kernel mirror (for testing)
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linux
1/*
2 * Copyright (c) 2002 Red Hat, Inc. All rights reserved.
3 *
4 * This software may be freely redistributed under the terms of the
5 * GNU General Public License.
6 *
7 * You should have received a copy of the GNU General Public License
8 * along with this program; if not, write to the Free Software
9 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
10 *
11 * Authors: David Woodhouse <dwmw2@cambridge.redhat.com>
12 * David Howells <dhowells@redhat.com>
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/sched.h>
20#include <linux/slab.h>
21#include <linux/fs.h>
22#include <linux/pagemap.h>
23#include "volume.h"
24#include "vnode.h"
25#include "super.h"
26#include "internal.h"
27
28struct afs_iget_data {
29 struct afs_fid fid;
30 struct afs_volume *volume; /* volume on which resides */
31};
32
33/*****************************************************************************/
34/*
35 * map the AFS file status to the inode member variables
36 */
37static int afs_inode_map_status(struct afs_vnode *vnode)
38{
39 struct inode *inode = AFS_VNODE_TO_I(vnode);
40
41 _debug("FS: ft=%d lk=%d sz=%Zu ver=%Lu mod=%hu",
42 vnode->status.type,
43 vnode->status.nlink,
44 vnode->status.size,
45 vnode->status.version,
46 vnode->status.mode);
47
48 switch (vnode->status.type) {
49 case AFS_FTYPE_FILE:
50 inode->i_mode = S_IFREG | vnode->status.mode;
51 inode->i_op = &afs_file_inode_operations;
52 inode->i_fop = &generic_ro_fops;
53 break;
54 case AFS_FTYPE_DIR:
55 inode->i_mode = S_IFDIR | vnode->status.mode;
56 inode->i_op = &afs_dir_inode_operations;
57 inode->i_fop = &afs_dir_file_operations;
58 break;
59 case AFS_FTYPE_SYMLINK:
60 inode->i_mode = S_IFLNK | vnode->status.mode;
61 inode->i_op = &page_symlink_inode_operations;
62 break;
63 default:
64 printk("kAFS: AFS vnode with undefined type\n");
65 return -EBADMSG;
66 }
67
68 inode->i_nlink = vnode->status.nlink;
69 inode->i_uid = vnode->status.owner;
70 inode->i_gid = 0;
71 inode->i_size = vnode->status.size;
72 inode->i_ctime.tv_sec = vnode->status.mtime_server;
73 inode->i_ctime.tv_nsec = 0;
74 inode->i_atime = inode->i_mtime = inode->i_ctime;
75 inode->i_blocks = 0;
76 inode->i_version = vnode->fid.unique;
77 inode->i_mapping->a_ops = &afs_fs_aops;
78
79 /* check to see whether a symbolic link is really a mountpoint */
80 if (vnode->status.type == AFS_FTYPE_SYMLINK) {
81 afs_mntpt_check_symlink(vnode);
82
83 if (vnode->flags & AFS_VNODE_MOUNTPOINT) {
84 inode->i_mode = S_IFDIR | vnode->status.mode;
85 inode->i_op = &afs_mntpt_inode_operations;
86 inode->i_fop = &afs_mntpt_file_operations;
87 }
88 }
89
90 return 0;
91} /* end afs_inode_map_status() */
92
93/*****************************************************************************/
94/*
95 * attempt to fetch the status of an inode, coelescing multiple simultaneous
96 * fetches
97 */
98static int afs_inode_fetch_status(struct inode *inode)
99{
100 struct afs_vnode *vnode;
101 int ret;
102
103 vnode = AFS_FS_I(inode);
104
105 ret = afs_vnode_fetch_status(vnode);
106
107 if (ret == 0)
108 ret = afs_inode_map_status(vnode);
109
110 return ret;
111
112} /* end afs_inode_fetch_status() */
113
114/*****************************************************************************/
115/*
116 * iget5() comparator
117 */
118static int afs_iget5_test(struct inode *inode, void *opaque)
119{
120 struct afs_iget_data *data = opaque;
121
122 return inode->i_ino == data->fid.vnode &&
123 inode->i_version == data->fid.unique;
124} /* end afs_iget5_test() */
125
126/*****************************************************************************/
127/*
128 * iget5() inode initialiser
129 */
130static int afs_iget5_set(struct inode *inode, void *opaque)
131{
132 struct afs_iget_data *data = opaque;
133 struct afs_vnode *vnode = AFS_FS_I(inode);
134
135 inode->i_ino = data->fid.vnode;
136 inode->i_version = data->fid.unique;
137 vnode->fid = data->fid;
138 vnode->volume = data->volume;
139
140 return 0;
141} /* end afs_iget5_set() */
142
143/*****************************************************************************/
144/*
145 * inode retrieval
146 */
147inline int afs_iget(struct super_block *sb, struct afs_fid *fid,
148 struct inode **_inode)
149{
150 struct afs_iget_data data = { .fid = *fid };
151 struct afs_super_info *as;
152 struct afs_vnode *vnode;
153 struct inode *inode;
154 int ret;
155
156 _enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique);
157
158 as = sb->s_fs_info;
159 data.volume = as->volume;
160
161 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
162 &data);
163 if (!inode) {
164 _leave(" = -ENOMEM");
165 return -ENOMEM;
166 }
167
168 vnode = AFS_FS_I(inode);
169
170 /* deal with an existing inode */
171 if (!(inode->i_state & I_NEW)) {
172 ret = afs_vnode_fetch_status(vnode);
173 if (ret==0)
174 *_inode = inode;
175 else
176 iput(inode);
177 _leave(" = %d", ret);
178 return ret;
179 }
180
181#ifdef AFS_CACHING_SUPPORT
182 /* set up caching before reading the status, as fetch-status reads the
183 * first page of symlinks to see if they're really mntpts */
184 cachefs_acquire_cookie(vnode->volume->cache,
185 NULL,
186 vnode,
187 &vnode->cache);
188#endif
189
190 /* okay... it's a new inode */
191 inode->i_flags |= S_NOATIME;
192 vnode->flags |= AFS_VNODE_CHANGED;
193 ret = afs_inode_fetch_status(inode);
194 if (ret<0)
195 goto bad_inode;
196
197 /* success */
198 unlock_new_inode(inode);
199
200 *_inode = inode;
201 _leave(" = 0 [CB { v=%u x=%lu t=%u }]",
202 vnode->cb_version,
203 vnode->cb_timeout.timo_jif,
204 vnode->cb_type);
205 return 0;
206
207 /* failure */
208 bad_inode:
209 make_bad_inode(inode);
210 unlock_new_inode(inode);
211 iput(inode);
212
213 _leave(" = %d [bad]", ret);
214 return ret;
215} /* end afs_iget() */
216
217/*****************************************************************************/
218/*
219 * read the attributes of an inode
220 */
221int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
222 struct kstat *stat)
223{
224 struct afs_vnode *vnode;
225 struct inode *inode;
226 int ret;
227
228 inode = dentry->d_inode;
229
230 _enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version);
231
232 vnode = AFS_FS_I(inode);
233
234 ret = afs_inode_fetch_status(inode);
235 if (ret == -ENOENT) {
236 _leave(" = %d [%d %p]",
237 ret, atomic_read(&dentry->d_count), dentry->d_inode);
238 return ret;
239 }
240 else if (ret < 0) {
241 make_bad_inode(inode);
242 _leave(" = %d", ret);
243 return ret;
244 }
245
246 /* transfer attributes from the inode structure to the stat
247 * structure */
248 generic_fillattr(inode, stat);
249
250 _leave(" = 0 CB { v=%u x=%u t=%u }",
251 vnode->cb_version,
252 vnode->cb_expiry,
253 vnode->cb_type);
254
255 return 0;
256} /* end afs_inode_getattr() */
257
258/*****************************************************************************/
259/*
260 * clear an AFS inode
261 */
262void afs_clear_inode(struct inode *inode)
263{
264 struct afs_vnode *vnode;
265
266 vnode = AFS_FS_I(inode);
267
268 _enter("ino=%lu { vn=%08x v=%u x=%u t=%u }",
269 inode->i_ino,
270 vnode->fid.vnode,
271 vnode->cb_version,
272 vnode->cb_expiry,
273 vnode->cb_type
274 );
275
276 BUG_ON(inode->i_ino != vnode->fid.vnode);
277
278 afs_vnode_give_up_callback(vnode);
279
280#ifdef AFS_CACHING_SUPPORT
281 cachefs_relinquish_cookie(vnode->cache, 0);
282 vnode->cache = NULL;
283#endif
284
285 _leave("");
286} /* end afs_clear_inode() */