ia64/linux-2.6.18-xen.hg

view fs/afs/inode.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
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 */
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"
28 struct afs_iget_data {
29 struct afs_fid fid;
30 struct afs_volume *volume; /* volume on which resides */
31 };
33 /*****************************************************************************/
34 /*
35 * map the AFS file status to the inode member variables
36 */
37 static int afs_inode_map_status(struct afs_vnode *vnode)
38 {
39 struct inode *inode = AFS_VNODE_TO_I(vnode);
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);
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 }
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_blksize = PAGE_CACHE_SIZE;
76 inode->i_blocks = 0;
77 inode->i_version = vnode->fid.unique;
78 inode->i_mapping->a_ops = &afs_fs_aops;
80 /* check to see whether a symbolic link is really a mountpoint */
81 if (vnode->status.type == AFS_FTYPE_SYMLINK) {
82 afs_mntpt_check_symlink(vnode);
84 if (vnode->flags & AFS_VNODE_MOUNTPOINT) {
85 inode->i_mode = S_IFDIR | vnode->status.mode;
86 inode->i_op = &afs_mntpt_inode_operations;
87 inode->i_fop = &afs_mntpt_file_operations;
88 }
89 }
91 return 0;
92 } /* end afs_inode_map_status() */
94 /*****************************************************************************/
95 /*
96 * attempt to fetch the status of an inode, coelescing multiple simultaneous
97 * fetches
98 */
99 static int afs_inode_fetch_status(struct inode *inode)
100 {
101 struct afs_vnode *vnode;
102 int ret;
104 vnode = AFS_FS_I(inode);
106 ret = afs_vnode_fetch_status(vnode);
108 if (ret == 0)
109 ret = afs_inode_map_status(vnode);
111 return ret;
113 } /* end afs_inode_fetch_status() */
115 /*****************************************************************************/
116 /*
117 * iget5() comparator
118 */
119 static int afs_iget5_test(struct inode *inode, void *opaque)
120 {
121 struct afs_iget_data *data = opaque;
123 return inode->i_ino == data->fid.vnode &&
124 inode->i_version == data->fid.unique;
125 } /* end afs_iget5_test() */
127 /*****************************************************************************/
128 /*
129 * iget5() inode initialiser
130 */
131 static int afs_iget5_set(struct inode *inode, void *opaque)
132 {
133 struct afs_iget_data *data = opaque;
134 struct afs_vnode *vnode = AFS_FS_I(inode);
136 inode->i_ino = data->fid.vnode;
137 inode->i_version = data->fid.unique;
138 vnode->fid = data->fid;
139 vnode->volume = data->volume;
141 return 0;
142 } /* end afs_iget5_set() */
144 /*****************************************************************************/
145 /*
146 * inode retrieval
147 */
148 inline int afs_iget(struct super_block *sb, struct afs_fid *fid,
149 struct inode **_inode)
150 {
151 struct afs_iget_data data = { .fid = *fid };
152 struct afs_super_info *as;
153 struct afs_vnode *vnode;
154 struct inode *inode;
155 int ret;
157 _enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique);
159 as = sb->s_fs_info;
160 data.volume = as->volume;
162 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
163 &data);
164 if (!inode) {
165 _leave(" = -ENOMEM");
166 return -ENOMEM;
167 }
169 vnode = AFS_FS_I(inode);
171 /* deal with an existing inode */
172 if (!(inode->i_state & I_NEW)) {
173 ret = afs_vnode_fetch_status(vnode);
174 if (ret==0)
175 *_inode = inode;
176 else
177 iput(inode);
178 _leave(" = %d", ret);
179 return ret;
180 }
182 #ifdef AFS_CACHING_SUPPORT
183 /* set up caching before reading the status, as fetch-status reads the
184 * first page of symlinks to see if they're really mntpts */
185 cachefs_acquire_cookie(vnode->volume->cache,
186 NULL,
187 vnode,
188 &vnode->cache);
189 #endif
191 /* okay... it's a new inode */
192 inode->i_flags |= S_NOATIME;
193 vnode->flags |= AFS_VNODE_CHANGED;
194 ret = afs_inode_fetch_status(inode);
195 if (ret<0)
196 goto bad_inode;
198 /* success */
199 unlock_new_inode(inode);
201 *_inode = inode;
202 _leave(" = 0 [CB { v=%u x=%lu t=%u }]",
203 vnode->cb_version,
204 vnode->cb_timeout.timo_jif,
205 vnode->cb_type);
206 return 0;
208 /* failure */
209 bad_inode:
210 make_bad_inode(inode);
211 unlock_new_inode(inode);
212 iput(inode);
214 _leave(" = %d [bad]", ret);
215 return ret;
216 } /* end afs_iget() */
218 /*****************************************************************************/
219 /*
220 * read the attributes of an inode
221 */
222 int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
223 struct kstat *stat)
224 {
225 struct afs_vnode *vnode;
226 struct inode *inode;
227 int ret;
229 inode = dentry->d_inode;
231 _enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version);
233 vnode = AFS_FS_I(inode);
235 ret = afs_inode_fetch_status(inode);
236 if (ret == -ENOENT) {
237 _leave(" = %d [%d %p]",
238 ret, atomic_read(&dentry->d_count), dentry->d_inode);
239 return ret;
240 }
241 else if (ret < 0) {
242 make_bad_inode(inode);
243 _leave(" = %d", ret);
244 return ret;
245 }
247 /* transfer attributes from the inode structure to the stat
248 * structure */
249 generic_fillattr(inode, stat);
251 _leave(" = 0 CB { v=%u x=%u t=%u }",
252 vnode->cb_version,
253 vnode->cb_expiry,
254 vnode->cb_type);
256 return 0;
257 } /* end afs_inode_getattr() */
259 /*****************************************************************************/
260 /*
261 * clear an AFS inode
262 */
263 void afs_clear_inode(struct inode *inode)
264 {
265 struct afs_vnode *vnode;
267 vnode = AFS_FS_I(inode);
269 _enter("ino=%lu { vn=%08x v=%u x=%u t=%u }",
270 inode->i_ino,
271 vnode->fid.vnode,
272 vnode->cb_version,
273 vnode->cb_expiry,
274 vnode->cb_type
275 );
277 BUG_ON(inode->i_ino != vnode->fid.vnode);
279 afs_vnode_give_up_callback(vnode);
281 #ifdef AFS_CACHING_SUPPORT
282 cachefs_relinquish_cookie(vnode->cache, 0);
283 vnode->cache = NULL;
284 #endif
286 _leave("");
287 } /* end afs_clear_inode() */