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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> | |
1da177e4 LT |
19 | #include <linux/slab.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/pagemap.h> | |
1da177e4 LT |
22 | #include "internal.h" |
23 | ||
24 | struct afs_iget_data { | |
25 | struct afs_fid fid; | |
26 | struct afs_volume *volume; /* volume on which resides */ | |
27 | }; | |
28 | ||
1da177e4 LT |
29 | /* |
30 | * map the AFS file status to the inode member variables | |
31 | */ | |
32 | static int afs_inode_map_status(struct afs_vnode *vnode) | |
33 | { | |
34 | struct inode *inode = AFS_VNODE_TO_I(vnode); | |
35 | ||
36 | _debug("FS: ft=%d lk=%d sz=%Zu ver=%Lu mod=%hu", | |
37 | vnode->status.type, | |
38 | vnode->status.nlink, | |
39 | vnode->status.size, | |
08e0e7c8 | 40 | vnode->status.data_version, |
1da177e4 LT |
41 | vnode->status.mode); |
42 | ||
43 | switch (vnode->status.type) { | |
44 | case AFS_FTYPE_FILE: | |
45 | inode->i_mode = S_IFREG | vnode->status.mode; | |
46 | inode->i_op = &afs_file_inode_operations; | |
a463ddd3 | 47 | inode->i_fop = &generic_ro_fops; |
1da177e4 LT |
48 | break; |
49 | case AFS_FTYPE_DIR: | |
50 | inode->i_mode = S_IFDIR | vnode->status.mode; | |
51 | inode->i_op = &afs_dir_inode_operations; | |
52 | inode->i_fop = &afs_dir_file_operations; | |
53 | break; | |
54 | case AFS_FTYPE_SYMLINK: | |
55 | inode->i_mode = S_IFLNK | vnode->status.mode; | |
56 | inode->i_op = &page_symlink_inode_operations; | |
57 | break; | |
58 | default: | |
59 | printk("kAFS: AFS vnode with undefined type\n"); | |
60 | return -EBADMSG; | |
61 | } | |
62 | ||
63 | inode->i_nlink = vnode->status.nlink; | |
64 | inode->i_uid = vnode->status.owner; | |
65 | inode->i_gid = 0; | |
66 | inode->i_size = vnode->status.size; | |
67 | inode->i_ctime.tv_sec = vnode->status.mtime_server; | |
68 | inode->i_ctime.tv_nsec = 0; | |
69 | inode->i_atime = inode->i_mtime = inode->i_ctime; | |
1da177e4 LT |
70 | inode->i_blocks = 0; |
71 | inode->i_version = vnode->fid.unique; | |
72 | inode->i_mapping->a_ops = &afs_fs_aops; | |
73 | ||
74 | /* check to see whether a symbolic link is really a mountpoint */ | |
75 | if (vnode->status.type == AFS_FTYPE_SYMLINK) { | |
76 | afs_mntpt_check_symlink(vnode); | |
77 | ||
08e0e7c8 | 78 | if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) { |
1da177e4 LT |
79 | inode->i_mode = S_IFDIR | vnode->status.mode; |
80 | inode->i_op = &afs_mntpt_inode_operations; | |
81 | inode->i_fop = &afs_mntpt_file_operations; | |
82 | } | |
83 | } | |
84 | ||
85 | return 0; | |
ec26815a | 86 | } |
1da177e4 | 87 | |
1da177e4 LT |
88 | /* |
89 | * iget5() comparator | |
90 | */ | |
91 | static int afs_iget5_test(struct inode *inode, void *opaque) | |
92 | { | |
93 | struct afs_iget_data *data = opaque; | |
94 | ||
95 | return inode->i_ino == data->fid.vnode && | |
96 | inode->i_version == data->fid.unique; | |
ec26815a | 97 | } |
1da177e4 | 98 | |
1da177e4 LT |
99 | /* |
100 | * iget5() inode initialiser | |
101 | */ | |
102 | static int afs_iget5_set(struct inode *inode, void *opaque) | |
103 | { | |
104 | struct afs_iget_data *data = opaque; | |
105 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
106 | ||
107 | inode->i_ino = data->fid.vnode; | |
108 | inode->i_version = data->fid.unique; | |
109 | vnode->fid = data->fid; | |
110 | vnode->volume = data->volume; | |
111 | ||
112 | return 0; | |
ec26815a | 113 | } |
1da177e4 | 114 | |
1da177e4 LT |
115 | /* |
116 | * inode retrieval | |
117 | */ | |
08e0e7c8 | 118 | inline struct inode *afs_iget(struct super_block *sb, struct afs_fid *fid) |
1da177e4 LT |
119 | { |
120 | struct afs_iget_data data = { .fid = *fid }; | |
121 | struct afs_super_info *as; | |
122 | struct afs_vnode *vnode; | |
123 | struct inode *inode; | |
124 | int ret; | |
125 | ||
126 | _enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique); | |
127 | ||
128 | as = sb->s_fs_info; | |
129 | data.volume = as->volume; | |
130 | ||
131 | inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set, | |
132 | &data); | |
133 | if (!inode) { | |
134 | _leave(" = -ENOMEM"); | |
08e0e7c8 | 135 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
136 | } |
137 | ||
08e0e7c8 DH |
138 | _debug("GOT INODE %p { vl=%x vn=%x, u=%x }", |
139 | inode, fid->vid, fid->vnode, fid->unique); | |
140 | ||
1da177e4 LT |
141 | vnode = AFS_FS_I(inode); |
142 | ||
143 | /* deal with an existing inode */ | |
144 | if (!(inode->i_state & I_NEW)) { | |
08e0e7c8 DH |
145 | _leave(" = %p", inode); |
146 | return inode; | |
1da177e4 LT |
147 | } |
148 | ||
149 | #ifdef AFS_CACHING_SUPPORT | |
150 | /* set up caching before reading the status, as fetch-status reads the | |
151 | * first page of symlinks to see if they're really mntpts */ | |
152 | cachefs_acquire_cookie(vnode->volume->cache, | |
153 | NULL, | |
154 | vnode, | |
155 | &vnode->cache); | |
156 | #endif | |
157 | ||
158 | /* okay... it's a new inode */ | |
08e0e7c8 DH |
159 | set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); |
160 | ret = afs_vnode_fetch_status(vnode); | |
161 | if (ret < 0) | |
162 | goto bad_inode; | |
163 | ret = afs_inode_map_status(vnode); | |
164 | if (ret < 0) | |
1da177e4 LT |
165 | goto bad_inode; |
166 | ||
167 | /* success */ | |
08e0e7c8 | 168 | inode->i_flags |= S_NOATIME; |
1da177e4 | 169 | unlock_new_inode(inode); |
08e0e7c8 DH |
170 | _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type); |
171 | return inode; | |
1da177e4 LT |
172 | |
173 | /* failure */ | |
ec26815a | 174 | bad_inode: |
1da177e4 LT |
175 | make_bad_inode(inode); |
176 | unlock_new_inode(inode); | |
177 | iput(inode); | |
178 | ||
179 | _leave(" = %d [bad]", ret); | |
08e0e7c8 | 180 | return ERR_PTR(ret); |
ec26815a | 181 | } |
1da177e4 | 182 | |
1da177e4 LT |
183 | /* |
184 | * read the attributes of an inode | |
185 | */ | |
186 | int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
187 | struct kstat *stat) | |
188 | { | |
1da177e4 | 189 | struct inode *inode; |
1da177e4 LT |
190 | |
191 | inode = dentry->d_inode; | |
192 | ||
193 | _enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version); | |
194 | ||
1da177e4 | 195 | generic_fillattr(inode, stat); |
1da177e4 | 196 | return 0; |
ec26815a | 197 | } |
1da177e4 | 198 | |
1da177e4 LT |
199 | /* |
200 | * clear an AFS inode | |
201 | */ | |
202 | void afs_clear_inode(struct inode *inode) | |
203 | { | |
204 | struct afs_vnode *vnode; | |
205 | ||
206 | vnode = AFS_FS_I(inode); | |
207 | ||
208 | _enter("ino=%lu { vn=%08x v=%u x=%u t=%u }", | |
209 | inode->i_ino, | |
210 | vnode->fid.vnode, | |
211 | vnode->cb_version, | |
212 | vnode->cb_expiry, | |
08e0e7c8 | 213 | vnode->cb_type); |
1da177e4 | 214 | |
08e0e7c8 DH |
215 | _debug("CLEAR INODE %p", inode); |
216 | ||
217 | ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); | |
218 | ||
219 | afs_give_up_callback(vnode); | |
220 | ||
221 | if (vnode->server) { | |
222 | spin_lock(&vnode->server->fs_lock); | |
223 | rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes); | |
224 | spin_unlock(&vnode->server->fs_lock); | |
225 | afs_put_server(vnode->server); | |
226 | vnode->server = NULL; | |
227 | } | |
1da177e4 | 228 | |
08e0e7c8 | 229 | ASSERT(!vnode->cb_promised); |
1da177e4 LT |
230 | |
231 | #ifdef AFS_CACHING_SUPPORT | |
232 | cachefs_relinquish_cookie(vnode->cache, 0); | |
233 | vnode->cache = NULL; | |
234 | #endif | |
235 | ||
236 | _leave(""); | |
ec26815a | 237 | } |