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>
24 struct afs_iget_data {
26 struct afs_volume *volume; /* volume on which resides */
30 * map the AFS file status to the inode member variables
32 static int afs_inode_map_status(struct afs_vnode *vnode)
34 struct inode *inode = AFS_VNODE_TO_I(vnode);
36 _debug("FS: ft=%d lk=%d sz=%Zu ver=%Lu mod=%hu",
40 vnode->status.data_version,
43 switch (vnode->status.type) {
45 inode->i_mode = S_IFREG | vnode->status.mode;
46 inode->i_op = &afs_file_inode_operations;
47 inode->i_fop = &generic_ro_fops;
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;
54 case AFS_FTYPE_SYMLINK:
55 inode->i_mode = S_IFLNK | vnode->status.mode;
56 inode->i_op = &page_symlink_inode_operations;
59 printk("kAFS: AFS vnode with undefined type\n");
63 inode->i_nlink = vnode->status.nlink;
64 inode->i_uid = vnode->status.owner;
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;
71 inode->i_version = vnode->fid.unique;
72 inode->i_mapping->a_ops = &afs_fs_aops;
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);
78 if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) {
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;
91 static int afs_iget5_test(struct inode *inode, void *opaque)
93 struct afs_iget_data *data = opaque;
95 return inode->i_ino == data->fid.vnode &&
96 inode->i_version == data->fid.unique;
100 * iget5() inode initialiser
102 static int afs_iget5_set(struct inode *inode, void *opaque)
104 struct afs_iget_data *data = opaque;
105 struct afs_vnode *vnode = AFS_FS_I(inode);
107 inode->i_ino = data->fid.vnode;
108 inode->i_version = data->fid.unique;
109 vnode->fid = data->fid;
110 vnode->volume = data->volume;
118 inline struct inode *afs_iget(struct super_block *sb, struct afs_fid *fid)
120 struct afs_iget_data data = { .fid = *fid };
121 struct afs_super_info *as;
122 struct afs_vnode *vnode;
126 _enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique);
129 data.volume = as->volume;
131 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
134 _leave(" = -ENOMEM");
135 return ERR_PTR(-ENOMEM);
138 _debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
139 inode, fid->vid, fid->vnode, fid->unique);
141 vnode = AFS_FS_I(inode);
143 /* deal with an existing inode */
144 if (!(inode->i_state & I_NEW)) {
145 _leave(" = %p", inode);
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,
158 /* okay... it's a new inode */
159 set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
160 ret = afs_vnode_fetch_status(vnode);
163 ret = afs_inode_map_status(vnode);
168 inode->i_flags |= S_NOATIME;
169 unlock_new_inode(inode);
170 _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
175 make_bad_inode(inode);
176 unlock_new_inode(inode);
179 _leave(" = %d [bad]", ret);
184 * read the attributes of an inode
186 int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
191 inode = dentry->d_inode;
193 _enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version);
195 generic_fillattr(inode, stat);
202 void afs_clear_inode(struct inode *inode)
204 struct afs_vnode *vnode;
206 vnode = AFS_FS_I(inode);
208 _enter("ino=%lu { vn=%08x v=%u x=%u t=%u }",
215 _debug("CLEAR INODE %p", inode);
217 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
219 afs_give_up_callback(vnode);
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;
229 ASSERT(!vnode->cb_promised);
231 #ifdef AFS_CACHING_SUPPORT
232 cachefs_relinquish_cookie(vnode->cache, 0);