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1da177e4 LT |
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 | ||
28 | struct 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 | */ | |
37 | static 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 = &afs_file_file_operations; | |
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_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; | |
79 | ||
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); | |
83 | ||
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 | } | |
90 | ||
91 | return 0; | |
92 | } /* end afs_inode_map_status() */ | |
93 | ||
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; | |
103 | ||
104 | vnode = AFS_FS_I(inode); | |
105 | ||
106 | ret = afs_vnode_fetch_status(vnode); | |
107 | ||
108 | if (ret == 0) | |
109 | ret = afs_inode_map_status(vnode); | |
110 | ||
111 | return ret; | |
112 | ||
113 | } /* end afs_inode_fetch_status() */ | |
114 | ||
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; | |
122 | ||
123 | return inode->i_ino == data->fid.vnode && | |
124 | inode->i_version == data->fid.unique; | |
125 | } /* end afs_iget5_test() */ | |
126 | ||
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); | |
135 | ||
136 | inode->i_ino = data->fid.vnode; | |
137 | inode->i_version = data->fid.unique; | |
138 | vnode->fid = data->fid; | |
139 | vnode->volume = data->volume; | |
140 | ||
141 | return 0; | |
142 | } /* end afs_iget5_set() */ | |
143 | ||
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; | |
156 | ||
157 | _enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique); | |
158 | ||
159 | as = sb->s_fs_info; | |
160 | data.volume = as->volume; | |
161 | ||
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 | } | |
168 | ||
169 | vnode = AFS_FS_I(inode); | |
170 | ||
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 | } | |
181 | ||
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 | |
190 | ||
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; | |
197 | ||
198 | /* success */ | |
199 | unlock_new_inode(inode); | |
200 | ||
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; | |
207 | ||
208 | /* failure */ | |
209 | bad_inode: | |
210 | make_bad_inode(inode); | |
211 | unlock_new_inode(inode); | |
212 | iput(inode); | |
213 | ||
214 | _leave(" = %d [bad]", ret); | |
215 | return ret; | |
216 | } /* end afs_iget() */ | |
217 | ||
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; | |
228 | ||
229 | inode = dentry->d_inode; | |
230 | ||
231 | _enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version); | |
232 | ||
233 | vnode = AFS_FS_I(inode); | |
234 | ||
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 | } | |
246 | ||
247 | /* transfer attributes from the inode structure to the stat | |
248 | * structure */ | |
249 | generic_fillattr(inode, stat); | |
250 | ||
251 | _leave(" = 0 CB { v=%u x=%u t=%u }", | |
252 | vnode->cb_version, | |
253 | vnode->cb_expiry, | |
254 | vnode->cb_type); | |
255 | ||
256 | return 0; | |
257 | } /* end afs_inode_getattr() */ | |
258 | ||
259 | /*****************************************************************************/ | |
260 | /* | |
261 | * clear an AFS inode | |
262 | */ | |
263 | void afs_clear_inode(struct inode *inode) | |
264 | { | |
265 | struct afs_vnode *vnode; | |
266 | ||
267 | vnode = AFS_FS_I(inode); | |
268 | ||
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 | ); | |
276 | ||
277 | BUG_ON(inode->i_ino != vnode->fid.vnode); | |
278 | ||
279 | afs_vnode_give_up_callback(vnode); | |
280 | ||
281 | #ifdef AFS_CACHING_SUPPORT | |
282 | cachefs_relinquish_cookie(vnode->cache, 0); | |
283 | vnode->cache = NULL; | |
284 | #endif | |
285 | ||
286 | _leave(""); | |
287 | } /* end afs_clear_inode() */ |