2 * Copyright (c) 2002 Red Hat, Inc. All rights reserved.
4 * This software may be freely redistributed under the terms of the
5 * GNU General Public License.
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.
11 * Authors: David Woodhouse <dwmw2@cambridge.redhat.com>
12 * David Howells <dhowells@redhat.com>
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>
22 #include <linux/pagemap.h>
28 struct afs_iget_data {
30 struct afs_volume *volume; /* volume on which resides */
33 /*****************************************************************************/
35 * map the AFS file status to the inode member variables
37 static int afs_inode_map_status(struct afs_vnode *vnode)
39 struct inode *inode = AFS_VNODE_TO_I(vnode);
41 _debug("FS: ft=%d lk=%d sz=%Zu ver=%Lu mod=%hu",
45 vnode->status.version,
48 switch (vnode->status.type) {
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;
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;
59 case AFS_FTYPE_SYMLINK:
60 inode->i_mode = S_IFLNK | vnode->status.mode;
61 inode->i_op = &page_symlink_inode_operations;
64 printk("kAFS: AFS vnode with undefined type\n");
68 #ifdef CONFIG_AFS_FSCACHE
69 if (vnode->status.size != inode->i_size)
70 fscache_set_i_size(vnode->cache, vnode->status.size);
73 inode->i_nlink = vnode->status.nlink;
74 inode->i_uid = vnode->status.owner;
76 inode->i_size = vnode->status.size;
77 inode->i_ctime.tv_sec = vnode->status.mtime_server;
78 inode->i_ctime.tv_nsec = 0;
79 inode->i_atime = inode->i_mtime = inode->i_ctime;
81 inode->i_version = vnode->fid.unique;
82 inode->i_mapping->a_ops = &afs_fs_aops;
84 /* check to see whether a symbolic link is really a mountpoint */
85 if (vnode->status.type == AFS_FTYPE_SYMLINK) {
86 afs_mntpt_check_symlink(vnode);
88 if (vnode->flags & AFS_VNODE_MOUNTPOINT) {
89 inode->i_mode = S_IFDIR | vnode->status.mode;
90 inode->i_op = &afs_mntpt_inode_operations;
91 inode->i_fop = &afs_mntpt_file_operations;
96 } /* end afs_inode_map_status() */
98 /*****************************************************************************/
100 * attempt to fetch the status of an inode, coelescing multiple simultaneous
103 static int afs_inode_fetch_status(struct inode *inode)
105 struct afs_vnode *vnode;
110 vnode = AFS_FS_I(inode);
112 ret = afs_vnode_fetch_status(vnode);
115 #ifdef CONFIG_AFS_FSCACHE
118 fscache_acquire_cookie(vnode->volume->cache,
119 &afs_vnode_cache_index_def,
122 printk("Negative\n");
125 ret = afs_inode_map_status(vnode);
126 #ifdef CONFIG_AFS_FSCACHE
128 fscache_relinquish_cookie(vnode->cache, 0);
134 _leave(" = %d", ret);
137 } /* end afs_inode_fetch_status() */
139 /*****************************************************************************/
143 static int afs_iget5_test(struct inode *inode, void *opaque)
145 struct afs_iget_data *data = opaque;
147 return inode->i_ino == data->fid.vnode &&
148 inode->i_version == data->fid.unique;
150 } /* end afs_iget5_test() */
152 /*****************************************************************************/
154 * iget5() inode initialiser
156 static int afs_iget5_set(struct inode *inode, void *opaque)
158 struct afs_iget_data *data = opaque;
159 struct afs_vnode *vnode = AFS_FS_I(inode);
161 inode->i_ino = data->fid.vnode;
162 inode->i_version = data->fid.unique;
163 vnode->fid = data->fid;
164 vnode->volume = data->volume;
167 } /* end afs_iget5_set() */
169 /*****************************************************************************/
173 inline int afs_iget(struct super_block *sb, struct afs_fid *fid,
174 struct inode **_inode)
176 struct afs_iget_data data = { .fid = *fid };
177 struct afs_super_info *as;
178 struct afs_vnode *vnode;
182 _enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique);
185 data.volume = as->volume;
187 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
190 _leave(" = -ENOMEM");
194 vnode = AFS_FS_I(inode);
196 /* deal with an existing inode */
197 if (!(inode->i_state & I_NEW)) {
198 ret = afs_vnode_fetch_status(vnode);
203 _leave(" = %d", ret);
207 /* okay... it's a new inode */
208 inode->i_flags |= S_NOATIME;
209 vnode->flags |= AFS_VNODE_CHANGED;
210 ret = afs_inode_fetch_status(inode);
215 unlock_new_inode(inode);
218 _leave(" = 0 [CB { v=%u x=%lu t=%u }]",
220 vnode->cb_timeout.timo_jif,
226 make_bad_inode(inode);
227 unlock_new_inode(inode);
230 _leave(" = %d [bad]", ret);
232 } /* end afs_iget() */
234 /*****************************************************************************/
236 * read the attributes of an inode
238 int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
241 struct afs_vnode *vnode;
245 inode = dentry->d_inode;
247 _enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version);
249 vnode = AFS_FS_I(inode);
251 ret = afs_inode_fetch_status(inode);
252 if (ret == -ENOENT) {
253 _leave(" = %d [%d %p]",
254 ret, atomic_read(&dentry->d_count), dentry->d_inode);
258 make_bad_inode(inode);
259 _leave(" = %d", ret);
263 /* transfer attributes from the inode structure to the stat
265 generic_fillattr(inode, stat);
267 _leave(" = 0 CB { v=%u x=%u t=%u }",
273 } /* end afs_inode_getattr() */
275 /*****************************************************************************/
279 void afs_clear_inode(struct inode *inode)
281 struct afs_vnode *vnode;
283 vnode = AFS_FS_I(inode);
285 _enter("ino=%lu { vn=%08x v=%u x=%u t=%u }",
293 BUG_ON(inode->i_ino != vnode->fid.vnode);
295 afs_vnode_give_up_callback(vnode);
297 #ifdef CONFIG_AFS_FSCACHE
298 fscache_relinquish_cookie(vnode->cache, 0);
303 } /* end afs_clear_inode() */