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/slab.h>
21 #include <linux/pagemap.h>
27 struct afs_iget_data {
29 struct afs_volume *volume; /* volume on which resides */
33 * map the AFS file status to the inode member variables
35 static int afs_inode_map_status(struct afs_vnode *vnode)
37 struct inode *inode = AFS_VNODE_TO_I(vnode);
39 _debug("FS: ft=%d lk=%d sz=%Zu ver=%Lu mod=%hu",
43 vnode->status.version,
46 switch (vnode->status.type) {
48 inode->i_mode = S_IFREG | vnode->status.mode;
49 inode->i_op = &afs_file_inode_operations;
50 inode->i_fop = &generic_ro_fops;
53 inode->i_mode = S_IFDIR | vnode->status.mode;
54 inode->i_op = &afs_dir_inode_operations;
55 inode->i_fop = &afs_dir_file_operations;
57 case AFS_FTYPE_SYMLINK:
58 inode->i_mode = S_IFLNK | vnode->status.mode;
59 inode->i_op = &page_symlink_inode_operations;
62 printk("kAFS: AFS vnode with undefined type\n");
66 inode->i_nlink = vnode->status.nlink;
67 inode->i_uid = vnode->status.owner;
69 inode->i_size = vnode->status.size;
70 inode->i_ctime.tv_sec = vnode->status.mtime_server;
71 inode->i_ctime.tv_nsec = 0;
72 inode->i_atime = inode->i_mtime = inode->i_ctime;
74 inode->i_version = vnode->fid.unique;
75 inode->i_mapping->a_ops = &afs_fs_aops;
77 /* check to see whether a symbolic link is really a mountpoint */
78 if (vnode->status.type == AFS_FTYPE_SYMLINK) {
79 afs_mntpt_check_symlink(vnode);
81 if (vnode->flags & AFS_VNODE_MOUNTPOINT) {
82 inode->i_mode = S_IFDIR | vnode->status.mode;
83 inode->i_op = &afs_mntpt_inode_operations;
84 inode->i_fop = &afs_mntpt_file_operations;
92 * attempt to fetch the status of an inode, coelescing multiple simultaneous
95 static int afs_inode_fetch_status(struct inode *inode)
97 struct afs_vnode *vnode;
100 vnode = AFS_FS_I(inode);
102 ret = afs_vnode_fetch_status(vnode);
105 ret = afs_inode_map_status(vnode);
113 static int afs_iget5_test(struct inode *inode, void *opaque)
115 struct afs_iget_data *data = opaque;
117 return inode->i_ino == data->fid.vnode &&
118 inode->i_version == data->fid.unique;
122 * iget5() inode initialiser
124 static int afs_iget5_set(struct inode *inode, void *opaque)
126 struct afs_iget_data *data = opaque;
127 struct afs_vnode *vnode = AFS_FS_I(inode);
129 inode->i_ino = data->fid.vnode;
130 inode->i_version = data->fid.unique;
131 vnode->fid = data->fid;
132 vnode->volume = data->volume;
140 inline int afs_iget(struct super_block *sb, struct afs_fid *fid,
141 struct inode **_inode)
143 struct afs_iget_data data = { .fid = *fid };
144 struct afs_super_info *as;
145 struct afs_vnode *vnode;
149 _enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique);
152 data.volume = as->volume;
154 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
157 _leave(" = -ENOMEM");
161 vnode = AFS_FS_I(inode);
163 /* deal with an existing inode */
164 if (!(inode->i_state & I_NEW)) {
165 ret = afs_vnode_fetch_status(vnode);
170 _leave(" = %d", ret);
174 #ifdef AFS_CACHING_SUPPORT
175 /* set up caching before reading the status, as fetch-status reads the
176 * first page of symlinks to see if they're really mntpts */
177 cachefs_acquire_cookie(vnode->volume->cache,
183 /* okay... it's a new inode */
184 inode->i_flags |= S_NOATIME;
185 vnode->flags |= AFS_VNODE_CHANGED;
186 ret = afs_inode_fetch_status(inode);
191 unlock_new_inode(inode);
194 _leave(" = 0 [CB { v=%u x=%lu t=%u }]",
196 vnode->cb_timeout.timo_jif,
202 make_bad_inode(inode);
203 unlock_new_inode(inode);
206 _leave(" = %d [bad]", ret);
211 * read the attributes of an inode
213 int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
216 struct afs_vnode *vnode;
220 inode = dentry->d_inode;
222 _enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version);
224 vnode = AFS_FS_I(inode);
226 ret = afs_inode_fetch_status(inode);
227 if (ret == -ENOENT) {
228 _leave(" = %d [%d %p]",
229 ret, atomic_read(&dentry->d_count), dentry->d_inode);
231 } else if (ret < 0) {
232 make_bad_inode(inode);
233 _leave(" = %d", ret);
237 /* transfer attributes from the inode structure to the stat
239 generic_fillattr(inode, stat);
241 _leave(" = 0 CB { v=%u x=%u t=%u }",
252 void afs_clear_inode(struct inode *inode)
254 struct afs_vnode *vnode;
256 vnode = AFS_FS_I(inode);
258 _enter("ino=%lu { vn=%08x v=%u x=%u t=%u }",
266 BUG_ON(inode->i_ino != vnode->fid.vnode);
268 afs_vnode_give_up_callback(vnode);
270 #ifdef AFS_CACHING_SUPPORT
271 cachefs_relinquish_cookie(vnode->cache, 0);