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Commit | Line | Data |
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ec26815a | 1 | /* mountpoint management |
1da177e4 LT |
2 | * |
3 | * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
1da177e4 LT |
15 | #include <linux/fs.h> |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/mount.h> | |
18 | #include <linux/namei.h> | |
5a0e3ad6 | 19 | #include <linux/gfp.h> |
1da177e4 LT |
20 | #include "internal.h" |
21 | ||
22 | ||
23 | static struct dentry *afs_mntpt_lookup(struct inode *dir, | |
24 | struct dentry *dentry, | |
00cd8dd3 | 25 | unsigned int flags); |
1da177e4 | 26 | static int afs_mntpt_open(struct inode *inode, struct file *file); |
08e0e7c8 | 27 | static void afs_mntpt_expiry_timed_out(struct work_struct *work); |
1da177e4 | 28 | |
4b6f5d20 | 29 | const struct file_operations afs_mntpt_file_operations = { |
1da177e4 | 30 | .open = afs_mntpt_open, |
6038f373 | 31 | .llseek = noop_llseek, |
1da177e4 LT |
32 | }; |
33 | ||
754661f1 | 34 | const struct inode_operations afs_mntpt_inode_operations = { |
1da177e4 | 35 | .lookup = afs_mntpt_lookup, |
1da177e4 | 36 | .readlink = page_readlink, |
416351f2 | 37 | .getattr = afs_getattr, |
1da177e4 LT |
38 | }; |
39 | ||
bec5eb61 | 40 | const struct inode_operations afs_autocell_inode_operations = { |
bec5eb61 | 41 | .getattr = afs_getattr, |
42 | }; | |
43 | ||
1da177e4 | 44 | static LIST_HEAD(afs_vfsmounts); |
08e0e7c8 | 45 | static DECLARE_DELAYED_WORK(afs_mntpt_expiry_timer, afs_mntpt_expiry_timed_out); |
1da177e4 | 46 | |
c1206a2c | 47 | static unsigned long afs_mntpt_expiry_timeout = 10 * 60; |
1da177e4 | 48 | |
1da177e4 LT |
49 | /* |
50 | * no valid lookup procedure on this sort of dir | |
51 | */ | |
52 | static struct dentry *afs_mntpt_lookup(struct inode *dir, | |
53 | struct dentry *dentry, | |
00cd8dd3 | 54 | unsigned int flags) |
1da177e4 | 55 | { |
a455589f | 56 | _enter("%p,%p{%pd2}", dir, dentry, dentry); |
1da177e4 | 57 | return ERR_PTR(-EREMOTE); |
ec26815a | 58 | } |
1da177e4 | 59 | |
1da177e4 LT |
60 | /* |
61 | * no valid open procedure on this sort of dir | |
62 | */ | |
63 | static int afs_mntpt_open(struct inode *inode, struct file *file) | |
64 | { | |
a455589f | 65 | _enter("%p,%p{%pD2}", inode, file, file); |
1da177e4 | 66 | return -EREMOTE; |
ec26815a | 67 | } |
1da177e4 | 68 | |
1da177e4 LT |
69 | /* |
70 | * create a vfsmount to be automounted | |
71 | */ | |
72 | static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt) | |
73 | { | |
74 | struct afs_super_info *super; | |
75 | struct vfsmount *mnt; | |
bec5eb61 | 76 | struct afs_vnode *vnode; |
083fd8b2 | 77 | struct page *page; |
bec5eb61 | 78 | char *devname, *options; |
79 | bool rwpath = false; | |
1da177e4 LT |
80 | int ret; |
81 | ||
a455589f | 82 | _enter("{%pd}", mntpt); |
1da177e4 | 83 | |
2b0143b5 | 84 | BUG_ON(!d_inode(mntpt)); |
1da177e4 | 85 | |
1da177e4 LT |
86 | ret = -ENOMEM; |
87 | devname = (char *) get_zeroed_page(GFP_KERNEL); | |
88 | if (!devname) | |
083fd8b2 | 89 | goto error_no_devname; |
1da177e4 LT |
90 | |
91 | options = (char *) get_zeroed_page(GFP_KERNEL); | |
92 | if (!options) | |
083fd8b2 | 93 | goto error_no_options; |
1da177e4 | 94 | |
2b0143b5 | 95 | vnode = AFS_FS_I(d_inode(mntpt)); |
bec5eb61 | 96 | if (test_bit(AFS_VNODE_PSEUDODIR, &vnode->flags)) { |
97 | /* if the directory is a pseudo directory, use the d_name */ | |
98 | static const char afs_root_cell[] = ":root.cell."; | |
99 | unsigned size = mntpt->d_name.len; | |
100 | ||
101 | ret = -ENOENT; | |
102 | if (size < 2 || size > AFS_MAXCELLNAME) | |
103 | goto error_no_page; | |
104 | ||
105 | if (mntpt->d_name.name[0] == '.') { | |
106 | devname[0] = '#'; | |
107 | memcpy(devname + 1, mntpt->d_name.name, size - 1); | |
108 | memcpy(devname + size, afs_root_cell, | |
109 | sizeof(afs_root_cell)); | |
110 | rwpath = true; | |
111 | } else { | |
112 | devname[0] = '%'; | |
113 | memcpy(devname + 1, mntpt->d_name.name, size); | |
114 | memcpy(devname + size + 1, afs_root_cell, | |
115 | sizeof(afs_root_cell)); | |
116 | } | |
117 | } else { | |
118 | /* read the contents of the AFS special symlink */ | |
2b0143b5 | 119 | loff_t size = i_size_read(d_inode(mntpt)); |
bec5eb61 | 120 | char *buf; |
121 | ||
122 | ret = -EINVAL; | |
123 | if (size > PAGE_SIZE - 1) | |
124 | goto error_no_page; | |
125 | ||
2b0143b5 | 126 | page = read_mapping_page(d_inode(mntpt)->i_mapping, 0, NULL); |
bec5eb61 | 127 | if (IS_ERR(page)) { |
128 | ret = PTR_ERR(page); | |
129 | goto error_no_page; | |
130 | } | |
131 | ||
132 | ret = -EIO; | |
133 | if (PageError(page)) | |
134 | goto error; | |
135 | ||
da4aa36d | 136 | buf = kmap_atomic(page); |
bec5eb61 | 137 | memcpy(devname, buf, size); |
da4aa36d | 138 | kunmap_atomic(buf); |
09cbfeaf | 139 | put_page(page); |
bec5eb61 | 140 | page = NULL; |
1da177e4 LT |
141 | } |
142 | ||
1da177e4 LT |
143 | /* work out what options we want */ |
144 | super = AFS_FS_S(mntpt->d_sb); | |
145 | memcpy(options, "cell=", 5); | |
146 | strcpy(options + 5, super->volume->cell->name); | |
bec5eb61 | 147 | if (super->volume->type == AFSVL_RWVOL || rwpath) |
1da177e4 LT |
148 | strcat(options, ",rwpath"); |
149 | ||
150 | /* try and do the mount */ | |
08e0e7c8 | 151 | _debug("--- attempting mount %s -o %s ---", devname, options); |
93faccbb | 152 | mnt = vfs_submount(mntpt, &afs_fs_type, devname, options); |
08e0e7c8 | 153 | _debug("--- mount result %p ---", mnt); |
1da177e4 LT |
154 | |
155 | free_page((unsigned long) devname); | |
156 | free_page((unsigned long) options); | |
08e0e7c8 | 157 | _leave(" = %p", mnt); |
1da177e4 LT |
158 | return mnt; |
159 | ||
ec26815a | 160 | error: |
09cbfeaf | 161 | put_page(page); |
083fd8b2 DH |
162 | error_no_page: |
163 | free_page((unsigned long) options); | |
164 | error_no_options: | |
165 | free_page((unsigned long) devname); | |
166 | error_no_devname: | |
08e0e7c8 | 167 | _leave(" = %d", ret); |
1da177e4 | 168 | return ERR_PTR(ret); |
ec26815a | 169 | } |
1da177e4 | 170 | |
1da177e4 | 171 | /* |
d18610b0 | 172 | * handle an automount point |
1da177e4 | 173 | */ |
d18610b0 | 174 | struct vfsmount *afs_d_automount(struct path *path) |
1da177e4 LT |
175 | { |
176 | struct vfsmount *newmnt; | |
1da177e4 | 177 | |
a455589f | 178 | _enter("{%pd}", path->dentry); |
08e0e7c8 | 179 | |
d18610b0 DH |
180 | newmnt = afs_mntpt_do_automount(path->dentry); |
181 | if (IS_ERR(newmnt)) | |
182 | return newmnt; | |
1da177e4 | 183 | |
ea5b778a DH |
184 | mntget(newmnt); /* prevent immediate expiration */ |
185 | mnt_set_expiry(newmnt, &afs_vfsmounts); | |
186 | queue_delayed_work(afs_wq, &afs_mntpt_expiry_timer, | |
187 | afs_mntpt_expiry_timeout * HZ); | |
5ffc2836 | 188 | _leave(" = %p", newmnt); |
ea5b778a | 189 | return newmnt; |
ec26815a | 190 | } |
1da177e4 | 191 | |
1da177e4 LT |
192 | /* |
193 | * handle mountpoint expiry timer going off | |
194 | */ | |
08e0e7c8 | 195 | static void afs_mntpt_expiry_timed_out(struct work_struct *work) |
1da177e4 | 196 | { |
08e0e7c8 DH |
197 | _enter(""); |
198 | ||
199 | if (!list_empty(&afs_vfsmounts)) { | |
200 | mark_mounts_for_expiry(&afs_vfsmounts); | |
0ad53eee TH |
201 | queue_delayed_work(afs_wq, &afs_mntpt_expiry_timer, |
202 | afs_mntpt_expiry_timeout * HZ); | |
08e0e7c8 DH |
203 | } |
204 | ||
205 | _leave(""); | |
206 | } | |
1da177e4 | 207 | |
08e0e7c8 DH |
208 | /* |
209 | * kill the AFS mountpoint timer if it's still running | |
210 | */ | |
211 | void afs_mntpt_kill_timer(void) | |
212 | { | |
213 | _enter(""); | |
1da177e4 | 214 | |
08e0e7c8 | 215 | ASSERT(list_empty(&afs_vfsmounts)); |
0ad53eee | 216 | cancel_delayed_work_sync(&afs_mntpt_expiry_timer); |
08e0e7c8 | 217 | } |