Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved |
| 3 | * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org> |
| 4 | * Copyright 2001-2006 Ian Kent <raven@themaw.net> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * This file is part of the Linux kernel and is made available under |
| 7 | * the terms of the GNU General Public License, version 2, or at your |
| 8 | * option, any later version, incorporated herein by reference. |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 9 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | |
Randy Dunlap | 16f7e0f | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 11 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/errno.h> |
| 13 | #include <linux/stat.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 14 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/param.h> |
| 16 | #include <linux/time.h> |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 17 | #include <linux/compat.h> |
Arnd Bergmann | 00e300e | 2010-09-14 23:00:34 +0200 | [diff] [blame] | 18 | #include <linux/mutex.h> |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include "autofs_i.h" |
| 21 | |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 22 | static int autofs4_dir_symlink(struct inode *, struct dentry *, const char *); |
| 23 | static int autofs4_dir_unlink(struct inode *, struct dentry *); |
| 24 | static int autofs4_dir_rmdir(struct inode *, struct dentry *); |
| 25 | static int autofs4_dir_mkdir(struct inode *, struct dentry *, umode_t); |
| 26 | static long autofs4_root_ioctl(struct file *, unsigned int, unsigned long); |
Felipe Contreras | 5a44a73 | 2010-09-24 15:22:23 +0200 | [diff] [blame] | 27 | #ifdef CONFIG_COMPAT |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 28 | static long autofs4_root_compat_ioctl(struct file *, |
| 29 | unsigned int, unsigned long); |
Felipe Contreras | 5a44a73 | 2010-09-24 15:22:23 +0200 | [diff] [blame] | 30 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | static int autofs4_dir_open(struct inode *inode, struct file *file); |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 32 | static struct dentry *autofs4_lookup(struct inode *, |
| 33 | struct dentry *, unsigned int); |
Ian Kent | 71e469d | 2011-01-14 18:46:19 +0000 | [diff] [blame] | 34 | static struct vfsmount *autofs4_d_automount(struct path *); |
Al Viro | 1aed3e4 | 2011-03-18 09:09:02 -0400 | [diff] [blame] | 35 | static int autofs4_d_manage(struct dentry *, bool); |
Al Viro | b89b12b | 2011-01-16 21:42:32 -0500 | [diff] [blame] | 36 | static void autofs4_dentry_release(struct dentry *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 38 | const struct file_operations autofs4_root_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | .open = dcache_dir_open, |
| 40 | .release = dcache_dir_close, |
| 41 | .read = generic_read_dir, |
Al Viro | 4e82901 | 2016-04-20 19:52:15 -0400 | [diff] [blame] | 42 | .iterate_shared = dcache_readdir, |
Al Viro | 59af158 | 2008-08-24 07:24:41 -0400 | [diff] [blame] | 43 | .llseek = dcache_dir_lseek, |
Frederic Weisbecker | 3663df7 | 2010-05-19 15:08:17 +0200 | [diff] [blame] | 44 | .unlocked_ioctl = autofs4_root_ioctl, |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 45 | #ifdef CONFIG_COMPAT |
| 46 | .compat_ioctl = autofs4_root_compat_ioctl, |
| 47 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | }; |
| 49 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 50 | const struct file_operations autofs4_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | .open = autofs4_dir_open, |
Ian Kent | ff9cd49 | 2008-07-23 21:30:24 -0700 | [diff] [blame] | 52 | .release = dcache_dir_close, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | .read = generic_read_dir, |
Al Viro | 4e82901 | 2016-04-20 19:52:15 -0400 | [diff] [blame] | 54 | .iterate_shared = dcache_readdir, |
Al Viro | 59af158 | 2008-08-24 07:24:41 -0400 | [diff] [blame] | 55 | .llseek = dcache_dir_lseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | }; |
| 57 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 58 | const struct inode_operations autofs4_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | .lookup = autofs4_lookup, |
| 60 | .unlink = autofs4_dir_unlink, |
| 61 | .symlink = autofs4_dir_symlink, |
| 62 | .mkdir = autofs4_dir_mkdir, |
| 63 | .rmdir = autofs4_dir_rmdir, |
| 64 | }; |
| 65 | |
Ian Kent | 71e469d | 2011-01-14 18:46:19 +0000 | [diff] [blame] | 66 | const struct dentry_operations autofs4_dentry_operations = { |
Ian Kent | 71e469d | 2011-01-14 18:46:19 +0000 | [diff] [blame] | 67 | .d_automount = autofs4_d_automount, |
| 68 | .d_manage = autofs4_d_manage, |
| 69 | .d_release = autofs4_dentry_release, |
| 70 | }; |
| 71 | |
Ian Kent | 4f8427d | 2009-12-15 16:45:42 -0800 | [diff] [blame] | 72 | static void autofs4_add_active(struct dentry *dentry) |
| 73 | { |
| 74 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 75 | struct autofs_info *ino; |
| 76 | |
| 77 | ino = autofs4_dentry_ino(dentry); |
Ian Kent | 4f8427d | 2009-12-15 16:45:42 -0800 | [diff] [blame] | 78 | if (ino) { |
| 79 | spin_lock(&sbi->lookup_lock); |
| 80 | if (!ino->active_count) { |
| 81 | if (list_empty(&ino->active)) |
| 82 | list_add(&ino->active, &sbi->active_list); |
| 83 | } |
| 84 | ino->active_count++; |
| 85 | spin_unlock(&sbi->lookup_lock); |
| 86 | } |
Ian Kent | 4f8427d | 2009-12-15 16:45:42 -0800 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | static void autofs4_del_active(struct dentry *dentry) |
| 90 | { |
| 91 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 92 | struct autofs_info *ino; |
| 93 | |
| 94 | ino = autofs4_dentry_ino(dentry); |
Ian Kent | 4f8427d | 2009-12-15 16:45:42 -0800 | [diff] [blame] | 95 | if (ino) { |
| 96 | spin_lock(&sbi->lookup_lock); |
| 97 | ino->active_count--; |
| 98 | if (!ino->active_count) { |
| 99 | if (!list_empty(&ino->active)) |
| 100 | list_del_init(&ino->active); |
| 101 | } |
| 102 | spin_unlock(&sbi->lookup_lock); |
| 103 | } |
Ian Kent | 4f8427d | 2009-12-15 16:45:42 -0800 | [diff] [blame] | 104 | } |
| 105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | static int autofs4_dir_open(struct inode *inode, struct file *file) |
| 107 | { |
Josef "Jeff" Sipek | a4669ed | 2006-12-08 02:36:46 -0800 | [diff] [blame] | 108 | struct dentry *dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
Ian Kent | f360ce3 | 2006-03-27 01:14:43 -0800 | [diff] [blame] | 110 | |
Ian Kent | 8a78d59 | 2016-03-15 14:58:45 -0700 | [diff] [blame] | 111 | pr_debug("file=%p dentry=%p %pd\n", file, dentry, dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
| 113 | if (autofs4_oz_mode(sbi)) |
| 114 | goto out; |
| 115 | |
Ian Kent | ff9cd49 | 2008-07-23 21:30:24 -0700 | [diff] [blame] | 116 | /* |
| 117 | * An empty directory in an autofs file system is always a |
| 118 | * mount point. The daemon must have failed to mount this |
| 119 | * during lookup so it doesn't exist. This can happen, for |
| 120 | * example, if user space returns an incorrect status for a |
| 121 | * mount request. Otherwise we're doing a readdir on the |
| 122 | * autofs file system so just let the libfs routines handle |
| 123 | * it. |
| 124 | */ |
Ian Kent | e785472 | 2011-03-25 01:51:31 +0800 | [diff] [blame] | 125 | spin_lock(&sbi->lookup_lock); |
Ian Kent | 0259cb0 | 2012-12-14 10:23:29 +0800 | [diff] [blame] | 126 | if (!d_mountpoint(dentry) && simple_empty(dentry)) { |
Ian Kent | e785472 | 2011-03-25 01:51:31 +0800 | [diff] [blame] | 127 | spin_unlock(&sbi->lookup_lock); |
Ian Kent | ff9cd49 | 2008-07-23 21:30:24 -0700 | [diff] [blame] | 128 | return -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | } |
Ian Kent | e785472 | 2011-03-25 01:51:31 +0800 | [diff] [blame] | 130 | spin_unlock(&sbi->lookup_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
Ian Kent | f360ce3 | 2006-03-27 01:14:43 -0800 | [diff] [blame] | 132 | out: |
Ian Kent | ff9cd49 | 2008-07-23 21:30:24 -0700 | [diff] [blame] | 133 | return dcache_dir_open(inode, file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
| 135 | |
Al Viro | b89b12b | 2011-01-16 21:42:32 -0500 | [diff] [blame] | 136 | static void autofs4_dentry_release(struct dentry *de) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
Al Viro | b89b12b | 2011-01-16 21:42:32 -0500 | [diff] [blame] | 138 | struct autofs_info *ino = autofs4_dentry_ino(de); |
| 139 | struct autofs_sb_info *sbi = autofs4_sbi(de->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
Ian Kent | 8a78d59 | 2016-03-15 14:58:45 -0700 | [diff] [blame] | 141 | pr_debug("releasing %p\n", de); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
Al Viro | b89b12b | 2011-01-16 21:42:32 -0500 | [diff] [blame] | 143 | if (!ino) |
| 144 | return; |
| 145 | |
| 146 | if (sbi) { |
| 147 | spin_lock(&sbi->lookup_lock); |
| 148 | if (!list_empty(&ino->active)) |
| 149 | list_del(&ino->active); |
| 150 | if (!list_empty(&ino->expiring)) |
| 151 | list_del(&ino->expiring); |
| 152 | spin_unlock(&sbi->lookup_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | } |
Al Viro | b89b12b | 2011-01-16 21:42:32 -0500 | [diff] [blame] | 154 | |
| 155 | autofs4_free_ino(ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | } |
| 157 | |
Ian Kent | 6510c9d | 2009-12-15 16:45:47 -0800 | [diff] [blame] | 158 | static struct dentry *autofs4_lookup_active(struct dentry *dentry) |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 159 | { |
Ian Kent | 6510c9d | 2009-12-15 16:45:47 -0800 | [diff] [blame] | 160 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
| 161 | struct dentry *parent = dentry->d_parent; |
Al Viro | 8ac790f | 2016-07-20 16:25:07 -0400 | [diff] [blame] | 162 | const struct qstr *name = &dentry->d_name; |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 163 | unsigned int len = name->len; |
| 164 | unsigned int hash = name->hash; |
| 165 | const unsigned char *str = name->name; |
| 166 | struct list_head *p, *head; |
| 167 | |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 168 | head = &sbi->active_list; |
NeilBrown | 668128e | 2014-08-08 14:19:54 -0700 | [diff] [blame] | 169 | if (list_empty(head)) |
| 170 | return NULL; |
| 171 | spin_lock(&sbi->lookup_lock); |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 172 | list_for_each(p, head) { |
| 173 | struct autofs_info *ino; |
Ian Kent | e4d5ade | 2009-12-15 16:45:49 -0800 | [diff] [blame] | 174 | struct dentry *active; |
Al Viro | 8ac790f | 2016-07-20 16:25:07 -0400 | [diff] [blame] | 175 | const struct qstr *qstr; |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 176 | |
| 177 | ino = list_entry(p, struct autofs_info, active); |
Ian Kent | e4d5ade | 2009-12-15 16:45:49 -0800 | [diff] [blame] | 178 | active = ino->dentry; |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 179 | |
Ian Kent | e4d5ade | 2009-12-15 16:45:49 -0800 | [diff] [blame] | 180 | spin_lock(&active->d_lock); |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 181 | |
| 182 | /* Already gone? */ |
Ian Kent | 6b6751f | 2014-05-06 12:50:06 -0700 | [diff] [blame] | 183 | if ((int) d_count(active) <= 0) |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 184 | goto next; |
| 185 | |
Ian Kent | e4d5ade | 2009-12-15 16:45:49 -0800 | [diff] [blame] | 186 | qstr = &active->d_name; |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 187 | |
Ian Kent | e4d5ade | 2009-12-15 16:45:49 -0800 | [diff] [blame] | 188 | if (active->d_name.hash != hash) |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 189 | goto next; |
Ian Kent | e4d5ade | 2009-12-15 16:45:49 -0800 | [diff] [blame] | 190 | if (active->d_parent != parent) |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 191 | goto next; |
| 192 | |
| 193 | if (qstr->len != len) |
| 194 | goto next; |
| 195 | if (memcmp(qstr->name, str, len)) |
| 196 | goto next; |
| 197 | |
Al Viro | 4b1ae27 | 2010-03-03 12:58:31 -0500 | [diff] [blame] | 198 | if (d_unhashed(active)) { |
Nick Piggin | b7ab39f | 2011-01-07 17:49:32 +1100 | [diff] [blame] | 199 | dget_dlock(active); |
Al Viro | 4b1ae27 | 2010-03-03 12:58:31 -0500 | [diff] [blame] | 200 | spin_unlock(&active->d_lock); |
| 201 | spin_unlock(&sbi->lookup_lock); |
Al Viro | 4b1ae27 | 2010-03-03 12:58:31 -0500 | [diff] [blame] | 202 | return active; |
| 203 | } |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 204 | next: |
Ian Kent | e4d5ade | 2009-12-15 16:45:49 -0800 | [diff] [blame] | 205 | spin_unlock(&active->d_lock); |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 206 | } |
| 207 | spin_unlock(&sbi->lookup_lock); |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 208 | |
| 209 | return NULL; |
| 210 | } |
| 211 | |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 212 | static struct dentry *autofs4_lookup_expiring(struct dentry *dentry, |
| 213 | bool rcu_walk) |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 214 | { |
Ian Kent | 6510c9d | 2009-12-15 16:45:47 -0800 | [diff] [blame] | 215 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
| 216 | struct dentry *parent = dentry->d_parent; |
Al Viro | 8ac790f | 2016-07-20 16:25:07 -0400 | [diff] [blame] | 217 | const struct qstr *name = &dentry->d_name; |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 218 | unsigned int len = name->len; |
| 219 | unsigned int hash = name->hash; |
| 220 | const unsigned char *str = name->name; |
| 221 | struct list_head *p, *head; |
| 222 | |
Ian Kent | 5f6f4f2 | 2008-07-23 21:30:09 -0700 | [diff] [blame] | 223 | head = &sbi->expiring_list; |
NeilBrown | 668128e | 2014-08-08 14:19:54 -0700 | [diff] [blame] | 224 | if (list_empty(head)) |
| 225 | return NULL; |
| 226 | spin_lock(&sbi->lookup_lock); |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 227 | list_for_each(p, head) { |
| 228 | struct autofs_info *ino; |
Ian Kent | cb4b492 | 2009-12-15 16:45:50 -0800 | [diff] [blame] | 229 | struct dentry *expiring; |
Al Viro | 8ac790f | 2016-07-20 16:25:07 -0400 | [diff] [blame] | 230 | const struct qstr *qstr; |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 231 | |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 232 | if (rcu_walk) { |
| 233 | spin_unlock(&sbi->lookup_lock); |
| 234 | return ERR_PTR(-ECHILD); |
| 235 | } |
| 236 | |
Ian Kent | 5f6f4f2 | 2008-07-23 21:30:09 -0700 | [diff] [blame] | 237 | ino = list_entry(p, struct autofs_info, expiring); |
Ian Kent | cb4b492 | 2009-12-15 16:45:50 -0800 | [diff] [blame] | 238 | expiring = ino->dentry; |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 239 | |
Ian Kent | cb4b492 | 2009-12-15 16:45:50 -0800 | [diff] [blame] | 240 | spin_lock(&expiring->d_lock); |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 241 | |
Ian Kent | 6b6751f | 2014-05-06 12:50:06 -0700 | [diff] [blame] | 242 | /* We've already been dentry_iput or unlinked */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 243 | if (d_really_is_negative(expiring)) |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 244 | goto next; |
| 245 | |
Ian Kent | cb4b492 | 2009-12-15 16:45:50 -0800 | [diff] [blame] | 246 | qstr = &expiring->d_name; |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 247 | |
Ian Kent | cb4b492 | 2009-12-15 16:45:50 -0800 | [diff] [blame] | 248 | if (expiring->d_name.hash != hash) |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 249 | goto next; |
Ian Kent | cb4b492 | 2009-12-15 16:45:50 -0800 | [diff] [blame] | 250 | if (expiring->d_parent != parent) |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 251 | goto next; |
| 252 | |
| 253 | if (qstr->len != len) |
| 254 | goto next; |
| 255 | if (memcmp(qstr->name, str, len)) |
| 256 | goto next; |
| 257 | |
Al Viro | 4b1ae27 | 2010-03-03 12:58:31 -0500 | [diff] [blame] | 258 | if (d_unhashed(expiring)) { |
Nick Piggin | b7ab39f | 2011-01-07 17:49:32 +1100 | [diff] [blame] | 259 | dget_dlock(expiring); |
Al Viro | 4b1ae27 | 2010-03-03 12:58:31 -0500 | [diff] [blame] | 260 | spin_unlock(&expiring->d_lock); |
| 261 | spin_unlock(&sbi->lookup_lock); |
Al Viro | 4b1ae27 | 2010-03-03 12:58:31 -0500 | [diff] [blame] | 262 | return expiring; |
| 263 | } |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 264 | next: |
Ian Kent | cb4b492 | 2009-12-15 16:45:50 -0800 | [diff] [blame] | 265 | spin_unlock(&expiring->d_lock); |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 266 | } |
Ian Kent | 5f6f4f2 | 2008-07-23 21:30:09 -0700 | [diff] [blame] | 267 | spin_unlock(&sbi->lookup_lock); |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 268 | |
| 269 | return NULL; |
| 270 | } |
| 271 | |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 272 | static int autofs4_mount_wait(struct dentry *dentry, bool rcu_walk) |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 273 | { |
| 274 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
| 275 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
Ian Kent | 3c31998 | 2011-03-25 01:51:08 +0800 | [diff] [blame] | 276 | int status = 0; |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 277 | |
| 278 | if (ino->flags & AUTOFS_INF_PENDING) { |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 279 | if (rcu_walk) |
| 280 | return -ECHILD; |
Ian Kent | 8a78d59 | 2016-03-15 14:58:45 -0700 | [diff] [blame] | 281 | pr_debug("waiting for mount name=%pd\n", dentry); |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 282 | status = autofs4_wait(sbi, dentry, NFY_MOUNT); |
Ian Kent | 8a78d59 | 2016-03-15 14:58:45 -0700 | [diff] [blame] | 283 | pr_debug("mount wait done status=%d\n", status); |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 284 | } |
Ian Kent | 3c31998 | 2011-03-25 01:51:08 +0800 | [diff] [blame] | 285 | ino->last_used = jiffies; |
| 286 | return status; |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 287 | } |
| 288 | |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 289 | static int do_expire_wait(struct dentry *dentry, bool rcu_walk) |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 290 | { |
| 291 | struct dentry *expiring; |
| 292 | |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 293 | expiring = autofs4_lookup_expiring(dentry, rcu_walk); |
| 294 | if (IS_ERR(expiring)) |
| 295 | return PTR_ERR(expiring); |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 296 | if (!expiring) |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 297 | return autofs4_expire_wait(dentry, rcu_walk); |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 298 | else { |
| 299 | /* |
| 300 | * If we are racing with expire the request might not |
| 301 | * be quite complete, but the directory has been removed |
| 302 | * so it must have been successful, just wait for it. |
| 303 | */ |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 304 | autofs4_expire_wait(expiring, 0); |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 305 | autofs4_del_expiring(expiring); |
| 306 | dput(expiring); |
| 307 | } |
| 308 | return 0; |
| 309 | } |
| 310 | |
| 311 | static struct dentry *autofs4_mountpoint_changed(struct path *path) |
| 312 | { |
| 313 | struct dentry *dentry = path->dentry; |
| 314 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
| 315 | |
| 316 | /* |
| 317 | * If this is an indirect mount the dentry could have gone away |
| 318 | * as a result of an expire and a new one created. |
| 319 | */ |
| 320 | if (autofs_type_indirect(sbi->type) && d_unhashed(dentry)) { |
| 321 | struct dentry *parent = dentry->d_parent; |
Ian Kent | 3c31998 | 2011-03-25 01:51:08 +0800 | [diff] [blame] | 322 | struct autofs_info *ino; |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 323 | struct dentry *new; |
| 324 | |
| 325 | new = d_lookup(parent, &dentry->d_name); |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 326 | if (!new) |
| 327 | return NULL; |
Ian Kent | 3c31998 | 2011-03-25 01:51:08 +0800 | [diff] [blame] | 328 | ino = autofs4_dentry_ino(new); |
| 329 | ino->last_used = jiffies; |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 330 | dput(path->dentry); |
| 331 | path->dentry = new; |
| 332 | } |
| 333 | return path->dentry; |
| 334 | } |
| 335 | |
Ian Kent | 71e469d | 2011-01-14 18:46:19 +0000 | [diff] [blame] | 336 | static struct vfsmount *autofs4_d_automount(struct path *path) |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 337 | { |
| 338 | struct dentry *dentry = path->dentry; |
| 339 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
| 340 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
| 341 | int status; |
| 342 | |
Ian Kent | 8a78d59 | 2016-03-15 14:58:45 -0700 | [diff] [blame] | 343 | pr_debug("dentry=%p %pd\n", dentry, dentry); |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 344 | |
| 345 | /* The daemon never triggers a mount. */ |
| 346 | if (autofs4_oz_mode(sbi)) |
| 347 | return NULL; |
| 348 | |
| 349 | /* |
| 350 | * If an expire request is pending everyone must wait. |
| 351 | * If the expire fails we're still mounted so continue |
| 352 | * the follow and return. A return of -EAGAIN (which only |
| 353 | * happens with indirect mounts) means the expire completed |
| 354 | * and the directory was removed, so just go ahead and try |
| 355 | * the mount. |
| 356 | */ |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 357 | status = do_expire_wait(dentry, 0); |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 358 | if (status && status != -EAGAIN) |
| 359 | return NULL; |
| 360 | |
| 361 | /* Callback to the daemon to perform the mount or wait */ |
| 362 | spin_lock(&sbi->fs_lock); |
| 363 | if (ino->flags & AUTOFS_INF_PENDING) { |
| 364 | spin_unlock(&sbi->fs_lock); |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 365 | status = autofs4_mount_wait(dentry, 0); |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 366 | if (status) |
| 367 | return ERR_PTR(status); |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 368 | goto done; |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * If the dentry is a symlink it's equivalent to a directory |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 373 | * having d_mountpoint() true, so there's no need to call back |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 374 | * to the daemon. |
| 375 | */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 376 | if (d_really_is_positive(dentry) && d_is_symlink(dentry)) { |
Ian Kent | f55fb0c | 2012-12-14 10:23:23 +0800 | [diff] [blame] | 377 | spin_unlock(&sbi->fs_lock); |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 378 | goto done; |
Ian Kent | f55fb0c | 2012-12-14 10:23:23 +0800 | [diff] [blame] | 379 | } |
| 380 | |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 381 | if (!d_mountpoint(dentry)) { |
| 382 | /* |
| 383 | * It's possible that user space hasn't removed directories |
| 384 | * after umounting a rootless multi-mount, although it |
| 385 | * should. For v5 have_submounts() is sufficient to handle |
| 386 | * this because the leaves of the directory tree under the |
| 387 | * mount never trigger mounts themselves (they have an autofs |
| 388 | * trigger mount mounted on them). But v4 pseudo direct mounts |
NeilBrown | 3b97dd0 | 2014-08-08 14:19:58 -0700 | [diff] [blame] | 389 | * do need the leaves to trigger mounts. In this case we |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 390 | * have no choice but to use the list_empty() check and |
| 391 | * require user space behave. |
| 392 | */ |
| 393 | if (sbi->version > 4) { |
Ian Kent | f55fb0c | 2012-12-14 10:23:23 +0800 | [diff] [blame] | 394 | if (have_submounts(dentry)) { |
| 395 | spin_unlock(&sbi->fs_lock); |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 396 | goto done; |
Ian Kent | f55fb0c | 2012-12-14 10:23:23 +0800 | [diff] [blame] | 397 | } |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 398 | } else { |
Peter Huewe | 9d8072e | 2013-03-01 19:46:40 +0800 | [diff] [blame] | 399 | if (!simple_empty(dentry)) { |
| 400 | spin_unlock(&sbi->fs_lock); |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 401 | goto done; |
Peter Huewe | 9d8072e | 2013-03-01 19:46:40 +0800 | [diff] [blame] | 402 | } |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 403 | } |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 404 | ino->flags |= AUTOFS_INF_PENDING; |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 405 | spin_unlock(&sbi->fs_lock); |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 406 | status = autofs4_mount_wait(dentry, 0); |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 407 | spin_lock(&sbi->fs_lock); |
| 408 | ino->flags &= ~AUTOFS_INF_PENDING; |
Ian Kent | 49999ab | 2012-10-11 08:00:33 +0800 | [diff] [blame] | 409 | if (status) { |
| 410 | spin_unlock(&sbi->fs_lock); |
| 411 | return ERR_PTR(status); |
| 412 | } |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 413 | } |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 414 | spin_unlock(&sbi->fs_lock); |
Ian Kent | f55fb0c | 2012-12-14 10:23:23 +0800 | [diff] [blame] | 415 | done: |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 416 | /* Mount succeeded, check if we ended up with a new dentry */ |
| 417 | dentry = autofs4_mountpoint_changed(path); |
| 418 | if (!dentry) |
| 419 | return ERR_PTR(-ENOENT); |
| 420 | |
| 421 | return NULL; |
| 422 | } |
| 423 | |
Claudiu Ghioc | 9548298 | 2013-05-06 13:47:16 +0800 | [diff] [blame] | 424 | static int autofs4_d_manage(struct dentry *dentry, bool rcu_walk) |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 425 | { |
| 426 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
Ian Kent | f55fb0c | 2012-12-14 10:23:23 +0800 | [diff] [blame] | 427 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
| 428 | int status; |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 429 | |
Ian Kent | 8a78d59 | 2016-03-15 14:58:45 -0700 | [diff] [blame] | 430 | pr_debug("dentry=%p %pd\n", dentry, dentry); |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 431 | |
| 432 | /* The daemon never waits. */ |
Al Viro | 1aed3e4 | 2011-03-18 09:09:02 -0400 | [diff] [blame] | 433 | if (autofs4_oz_mode(sbi)) { |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 434 | if (!d_mountpoint(dentry)) |
| 435 | return -EISDIR; |
| 436 | return 0; |
| 437 | } |
| 438 | |
| 439 | /* Wait for pending expires */ |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 440 | if (do_expire_wait(dentry, rcu_walk) == -ECHILD) |
| 441 | return -ECHILD; |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 442 | |
| 443 | /* |
| 444 | * This dentry may be under construction so wait on mount |
| 445 | * completion. |
| 446 | */ |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 447 | status = autofs4_mount_wait(dentry, rcu_walk); |
Ian Kent | f55fb0c | 2012-12-14 10:23:23 +0800 | [diff] [blame] | 448 | if (status) |
| 449 | return status; |
| 450 | |
NeilBrown | ef16cc5 | 2014-10-13 15:52:22 -0700 | [diff] [blame] | 451 | if (rcu_walk) { |
| 452 | /* We don't need fs_lock in rcu_walk mode, |
| 453 | * just testing 'AUTOFS_INFO_NO_RCU' is enough. |
| 454 | * simple_empty() takes a spinlock, so leave it |
| 455 | * to last. |
| 456 | * We only return -EISDIR when certain this isn't |
| 457 | * a mount-trap. |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 458 | */ |
NeilBrown | ef16cc5 | 2014-10-13 15:52:22 -0700 | [diff] [blame] | 459 | struct inode *inode; |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 460 | |
Al Viro | ea01a18 | 2016-06-12 11:24:46 -0400 | [diff] [blame] | 461 | if (ino->flags & AUTOFS_INF_WANT_EXPIRE) |
NeilBrown | ef16cc5 | 2014-10-13 15:52:22 -0700 | [diff] [blame] | 462 | return 0; |
| 463 | if (d_mountpoint(dentry)) |
| 464 | return 0; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 465 | inode = d_inode_rcu(dentry); |
NeilBrown | ef16cc5 | 2014-10-13 15:52:22 -0700 | [diff] [blame] | 466 | if (inode && S_ISLNK(inode->i_mode)) |
| 467 | return -EISDIR; |
| 468 | if (list_empty(&dentry->d_subdirs)) |
| 469 | return 0; |
| 470 | if (!simple_empty(dentry)) |
| 471 | return -EISDIR; |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 472 | return 0; |
NeilBrown | ef16cc5 | 2014-10-13 15:52:22 -0700 | [diff] [blame] | 473 | } |
NeilBrown | 23bfc2a | 2014-10-13 15:52:14 -0700 | [diff] [blame] | 474 | |
Ian Kent | f55fb0c | 2012-12-14 10:23:23 +0800 | [diff] [blame] | 475 | spin_lock(&sbi->fs_lock); |
| 476 | /* |
| 477 | * If the dentry has been selected for expire while we slept |
| 478 | * on the lock then it might go away. We'll deal with that in |
| 479 | * ->d_automount() and wait on a new mount if the expire |
| 480 | * succeeds or return here if it doesn't (since there's no |
| 481 | * mount to follow with a rootless multi-mount). |
| 482 | */ |
| 483 | if (!(ino->flags & AUTOFS_INF_EXPIRING)) { |
| 484 | /* |
| 485 | * Any needed mounting has been completed and the path |
| 486 | * updated so check if this is a rootless multi-mount so |
| 487 | * we can avoid needless calls ->d_automount() and avoid |
| 488 | * an incorrect ELOOP error return. |
| 489 | */ |
| 490 | if ((!d_mountpoint(dentry) && !simple_empty(dentry)) || |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 491 | (d_really_is_positive(dentry) && d_is_symlink(dentry))) |
Ian Kent | f55fb0c | 2012-12-14 10:23:23 +0800 | [diff] [blame] | 492 | status = -EISDIR; |
| 493 | } |
| 494 | spin_unlock(&sbi->fs_lock); |
| 495 | |
| 496 | return status; |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 497 | } |
| 498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | /* Lookups in the root directory */ |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 500 | static struct dentry *autofs4_lookup(struct inode *dir, |
| 501 | struct dentry *dentry, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | { |
| 503 | struct autofs_sb_info *sbi; |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 504 | struct autofs_info *ino; |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 505 | struct dentry *active; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
Ian Kent | 8a78d59 | 2016-03-15 14:58:45 -0700 | [diff] [blame] | 507 | pr_debug("name = %pd\n", dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
Ian Kent | 718c604 | 2006-03-27 01:14:42 -0800 | [diff] [blame] | 509 | /* File name too long to exist */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | if (dentry->d_name.len > NAME_MAX) |
Ian Kent | 718c604 | 2006-03-27 01:14:42 -0800 | [diff] [blame] | 511 | return ERR_PTR(-ENAMETOOLONG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
| 513 | sbi = autofs4_sbi(dir->i_sb); |
Ian Kent | 718c604 | 2006-03-27 01:14:42 -0800 | [diff] [blame] | 514 | |
Ian Kent | 8a78d59 | 2016-03-15 14:58:45 -0700 | [diff] [blame] | 515 | pr_debug("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d\n", |
| 516 | current->pid, task_pgrp_nr(current), sbi->catatonic, |
| 517 | autofs4_oz_mode(sbi)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
Ian Kent | 6510c9d | 2009-12-15 16:45:47 -0800 | [diff] [blame] | 519 | active = autofs4_lookup_active(dentry); |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 520 | if (active) |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 521 | return active; |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 522 | else { |
Al Viro | 4b1ae27 | 2010-03-03 12:58:31 -0500 | [diff] [blame] | 523 | /* |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 524 | * A dentry that is not within the root can never trigger a |
| 525 | * mount operation, unless the directory already exists, so we |
| 526 | * can return fail immediately. The daemon however does need |
| 527 | * to create directories within the file system. |
Al Viro | 4b1ae27 | 2010-03-03 12:58:31 -0500 | [diff] [blame] | 528 | */ |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 529 | if (!autofs4_oz_mode(sbi) && !IS_ROOT(dentry->d_parent)) |
| 530 | return ERR_PTR(-ENOENT); |
| 531 | |
| 532 | /* Mark entries in the root as mount triggers */ |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 533 | if (IS_ROOT(dentry->d_parent) && |
| 534 | autofs_type_indirect(sbi->type)) |
Ian Kent | b5b8017 | 2011-01-14 18:46:03 +0000 | [diff] [blame] | 535 | __managed_dentry_set_managed(dentry); |
Ian Kent | 1058421 | 2011-01-14 18:45:58 +0000 | [diff] [blame] | 536 | |
Al Viro | 26e6c91 | 2011-01-16 18:43:40 -0500 | [diff] [blame] | 537 | ino = autofs4_new_ino(sbi); |
Al Viro | 4b1ae27 | 2010-03-03 12:58:31 -0500 | [diff] [blame] | 538 | if (!ino) |
| 539 | return ERR_PTR(-ENOMEM); |
| 540 | |
| 541 | dentry->d_fsdata = ino; |
| 542 | ino->dentry = dentry; |
| 543 | |
| 544 | autofs4_add_active(dentry); |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 545 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | return NULL; |
| 547 | } |
| 548 | |
| 549 | static int autofs4_dir_symlink(struct inode *dir, |
| 550 | struct dentry *dentry, |
| 551 | const char *symname) |
| 552 | { |
| 553 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); |
| 554 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 555 | struct autofs_info *p_ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | struct inode *inode; |
Al Viro | 0bf71d4 | 2011-01-16 17:39:15 -0500 | [diff] [blame] | 557 | size_t size = strlen(symname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | char *cp; |
| 559 | |
Ian Kent | 8a78d59 | 2016-03-15 14:58:45 -0700 | [diff] [blame] | 560 | pr_debug("%s <- %pd\n", symname, dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
| 562 | if (!autofs4_oz_mode(sbi)) |
| 563 | return -EACCES; |
| 564 | |
Al Viro | 5a37db3 | 2011-01-16 18:29:35 -0500 | [diff] [blame] | 565 | BUG_ON(!ino); |
| 566 | |
Al Viro | 26e6c91 | 2011-01-16 18:43:40 -0500 | [diff] [blame] | 567 | autofs4_clean_ino(ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
Al Viro | 4b1ae27 | 2010-03-03 12:58:31 -0500 | [diff] [blame] | 569 | autofs4_del_active(dentry); |
| 570 | |
Al Viro | 0bf71d4 | 2011-01-16 17:39:15 -0500 | [diff] [blame] | 571 | cp = kmalloc(size + 1, GFP_KERNEL); |
Al Viro | 5a37db3 | 2011-01-16 18:29:35 -0500 | [diff] [blame] | 572 | if (!cp) |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 573 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | |
| 575 | strcpy(cp, symname); |
| 576 | |
Al Viro | 726a5e0 | 2011-01-16 17:43:52 -0500 | [diff] [blame] | 577 | inode = autofs4_get_inode(dir->i_sb, S_IFLNK | 0555); |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 578 | if (!inode) { |
| 579 | kfree(cp); |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 580 | return -ENOMEM; |
| 581 | } |
Al Viro | 292c5ee | 2011-01-17 00:47:38 -0500 | [diff] [blame] | 582 | inode->i_private = cp; |
Al Viro | 0bf71d4 | 2011-01-16 17:39:15 -0500 | [diff] [blame] | 583 | inode->i_size = size; |
Ian Kent | 1864f7b | 2007-08-22 14:01:54 -0700 | [diff] [blame] | 584 | d_add(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
Al Viro | 5a37db3 | 2011-01-16 18:29:35 -0500 | [diff] [blame] | 586 | dget(dentry); |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 587 | atomic_inc(&ino->count); |
| 588 | p_ino = autofs4_dentry_ino(dentry->d_parent); |
Rui Xiang | c24930a | 2014-01-23 15:55:00 -0800 | [diff] [blame] | 589 | if (p_ino && !IS_ROOT(dentry)) |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 590 | atomic_inc(&p_ino->count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 592 | dir->i_mtime = current_time(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
| 594 | return 0; |
| 595 | } |
| 596 | |
| 597 | /* |
| 598 | * NOTE! |
| 599 | * |
| 600 | * Normal filesystems would do a "d_delete()" to tell the VFS dcache |
| 601 | * that the file no longer exists. However, doing that means that the |
| 602 | * VFS layer can turn the dentry into a negative dentry. We don't want |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 603 | * this, because the unlink is probably the result of an expire. |
Ian Kent | 5f6f4f2 | 2008-07-23 21:30:09 -0700 | [diff] [blame] | 604 | * We simply d_drop it and add it to a expiring list in the super block, |
| 605 | * which allows the dentry lookup to check for an incomplete expire. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | * |
| 607 | * If a process is blocked on the dentry waiting for the expire to finish, |
| 608 | * it will invalidate the dentry and try to mount with a new one. |
| 609 | * |
| 610 | * Also see autofs4_dir_rmdir().. |
| 611 | */ |
| 612 | static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry) |
| 613 | { |
| 614 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); |
| 615 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 616 | struct autofs_info *p_ino; |
Ian Kent | 0266725 | 2016-03-15 14:58:36 -0700 | [diff] [blame] | 617 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | /* This allows root to remove symlinks */ |
Sukadev Bhattiprolu | d78e53c | 2007-05-10 22:23:06 -0700 | [diff] [blame] | 619 | if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) |
Zhao Hongjiang | 4173581 | 2013-02-20 13:13:55 +1100 | [diff] [blame] | 620 | return -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 622 | if (atomic_dec_and_test(&ino->count)) { |
| 623 | p_ino = autofs4_dentry_ino(dentry->d_parent); |
Rui Xiang | c24930a | 2014-01-23 15:55:00 -0800 | [diff] [blame] | 624 | if (p_ino && !IS_ROOT(dentry)) |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 625 | atomic_dec(&p_ino->count); |
| 626 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | dput(ino->dentry); |
| 628 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 629 | d_inode(dentry)->i_size = 0; |
| 630 | clear_nlink(d_inode(dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 632 | dir->i_mtime = current_time(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | |
Ian Kent | e785472 | 2011-03-25 01:51:31 +0800 | [diff] [blame] | 634 | spin_lock(&sbi->lookup_lock); |
| 635 | __autofs4_add_expiring(dentry); |
Ian Kent | 0259cb0 | 2012-12-14 10:23:29 +0800 | [diff] [blame] | 636 | d_drop(dentry); |
Ian Kent | e785472 | 2011-03-25 01:51:31 +0800 | [diff] [blame] | 637 | spin_unlock(&sbi->lookup_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | |
| 639 | return 0; |
| 640 | } |
| 641 | |
Ian Kent | dd89f90 | 2011-01-14 18:46:35 +0000 | [diff] [blame] | 642 | /* |
| 643 | * Version 4 of autofs provides a pseudo direct mount implementation |
| 644 | * that relies on directories at the leaves of a directory tree under |
| 645 | * an indirect mount to trigger mounts. To allow for this we need to |
| 646 | * set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves |
| 647 | * of the directory tree. There is no need to clear the automount flag |
| 648 | * following a mount or restore it after an expire because these mounts |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 649 | * are always covered. However, it is necessary to ensure that these |
Ian Kent | dd89f90 | 2011-01-14 18:46:35 +0000 | [diff] [blame] | 650 | * flags are clear on non-empty directories to avoid unnecessary calls |
| 651 | * during path walks. |
| 652 | */ |
| 653 | static void autofs_set_leaf_automount_flags(struct dentry *dentry) |
| 654 | { |
| 655 | struct dentry *parent; |
| 656 | |
| 657 | /* root and dentrys in the root are already handled */ |
| 658 | if (IS_ROOT(dentry->d_parent)) |
| 659 | return; |
| 660 | |
| 661 | managed_dentry_set_managed(dentry); |
| 662 | |
| 663 | parent = dentry->d_parent; |
| 664 | /* only consider parents below dentrys in the root */ |
| 665 | if (IS_ROOT(parent->d_parent)) |
| 666 | return; |
| 667 | managed_dentry_clear_managed(parent); |
Ian Kent | dd89f90 | 2011-01-14 18:46:35 +0000 | [diff] [blame] | 668 | } |
| 669 | |
| 670 | static void autofs_clear_leaf_automount_flags(struct dentry *dentry) |
| 671 | { |
| 672 | struct list_head *d_child; |
| 673 | struct dentry *parent; |
| 674 | |
| 675 | /* flags for dentrys in the root are handled elsewhere */ |
| 676 | if (IS_ROOT(dentry->d_parent)) |
| 677 | return; |
| 678 | |
| 679 | managed_dentry_clear_managed(dentry); |
| 680 | |
| 681 | parent = dentry->d_parent; |
| 682 | /* only consider parents below dentrys in the root */ |
| 683 | if (IS_ROOT(parent->d_parent)) |
| 684 | return; |
Al Viro | 946e51f | 2014-10-26 19:19:16 -0400 | [diff] [blame] | 685 | d_child = &dentry->d_child; |
Ian Kent | dd89f90 | 2011-01-14 18:46:35 +0000 | [diff] [blame] | 686 | /* Set parent managed if it's becoming empty */ |
| 687 | if (d_child->next == &parent->d_subdirs && |
| 688 | d_child->prev == &parent->d_subdirs) |
| 689 | managed_dentry_set_managed(parent); |
Ian Kent | dd89f90 | 2011-01-14 18:46:35 +0000 | [diff] [blame] | 690 | } |
| 691 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry) |
| 693 | { |
| 694 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); |
| 695 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 696 | struct autofs_info *p_ino; |
Ian Kent | 0266725 | 2016-03-15 14:58:36 -0700 | [diff] [blame] | 697 | |
Ian Kent | 8a78d59 | 2016-03-15 14:58:45 -0700 | [diff] [blame] | 698 | pr_debug("dentry %p, removing %pd\n", dentry, dentry); |
Ian Kent | f50b6f8 | 2007-02-20 13:58:10 -0800 | [diff] [blame] | 699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | if (!autofs4_oz_mode(sbi)) |
| 701 | return -EACCES; |
| 702 | |
Nick Piggin | 2fd6b7f | 2011-01-07 17:49:34 +1100 | [diff] [blame] | 703 | spin_lock(&sbi->lookup_lock); |
Ian Kent | 0259cb0 | 2012-12-14 10:23:29 +0800 | [diff] [blame] | 704 | if (!simple_empty(dentry)) { |
Nick Piggin | 2fd6b7f | 2011-01-07 17:49:34 +1100 | [diff] [blame] | 705 | spin_unlock(&sbi->lookup_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | return -ENOTEMPTY; |
| 707 | } |
Nick Piggin | 2fd6b7f | 2011-01-07 17:49:34 +1100 | [diff] [blame] | 708 | __autofs4_add_expiring(dentry); |
Ian Kent | 0259cb0 | 2012-12-14 10:23:29 +0800 | [diff] [blame] | 709 | d_drop(dentry); |
Ian Kent | e785472 | 2011-03-25 01:51:31 +0800 | [diff] [blame] | 710 | spin_unlock(&sbi->lookup_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
Ian Kent | dd89f90 | 2011-01-14 18:46:35 +0000 | [diff] [blame] | 712 | if (sbi->version < 5) |
| 713 | autofs_clear_leaf_automount_flags(dentry); |
| 714 | |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 715 | if (atomic_dec_and_test(&ino->count)) { |
| 716 | p_ino = autofs4_dentry_ino(dentry->d_parent); |
| 717 | if (p_ino && dentry->d_parent != dentry) |
| 718 | atomic_dec(&p_ino->count); |
| 719 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | dput(ino->dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 721 | d_inode(dentry)->i_size = 0; |
| 722 | clear_nlink(d_inode(dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | if (dir->i_nlink) |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 725 | drop_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
| 727 | return 0; |
| 728 | } |
| 729 | |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 730 | static int autofs4_dir_mkdir(struct inode *dir, |
| 731 | struct dentry *dentry, umode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | { |
| 733 | struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); |
| 734 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 735 | struct autofs_info *p_ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | struct inode *inode; |
| 737 | |
Sukadev Bhattiprolu | d78e53c | 2007-05-10 22:23:06 -0700 | [diff] [blame] | 738 | if (!autofs4_oz_mode(sbi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | return -EACCES; |
| 740 | |
Ian Kent | 8a78d59 | 2016-03-15 14:58:45 -0700 | [diff] [blame] | 741 | pr_debug("dentry %p, creating %pd\n", dentry, dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | |
Al Viro | 5a37db3 | 2011-01-16 18:29:35 -0500 | [diff] [blame] | 743 | BUG_ON(!ino); |
| 744 | |
Al Viro | 26e6c91 | 2011-01-16 18:43:40 -0500 | [diff] [blame] | 745 | autofs4_clean_ino(ino); |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 746 | |
Al Viro | 4b1ae27 | 2010-03-03 12:58:31 -0500 | [diff] [blame] | 747 | autofs4_del_active(dentry); |
| 748 | |
Al Viro | 726a5e0 | 2011-01-16 17:43:52 -0500 | [diff] [blame] | 749 | inode = autofs4_get_inode(dir->i_sb, S_IFDIR | 0555); |
Al Viro | 5a37db3 | 2011-01-16 18:29:35 -0500 | [diff] [blame] | 750 | if (!inode) |
Ian Kent | 2576737 | 2008-07-23 21:30:12 -0700 | [diff] [blame] | 751 | return -ENOMEM; |
Ian Kent | 1864f7b | 2007-08-22 14:01:54 -0700 | [diff] [blame] | 752 | d_add(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | |
Ian Kent | dd89f90 | 2011-01-14 18:46:35 +0000 | [diff] [blame] | 754 | if (sbi->version < 5) |
| 755 | autofs_set_leaf_automount_flags(dentry); |
| 756 | |
Al Viro | 5a37db3 | 2011-01-16 18:29:35 -0500 | [diff] [blame] | 757 | dget(dentry); |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 758 | atomic_inc(&ino->count); |
| 759 | p_ino = autofs4_dentry_ino(dentry->d_parent); |
Rui Xiang | c24930a | 2014-01-23 15:55:00 -0800 | [diff] [blame] | 760 | if (p_ino && !IS_ROOT(dentry)) |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 761 | atomic_inc(&p_ino->count); |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 762 | inc_nlink(dir); |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 763 | dir->i_mtime = current_time(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
| 765 | return 0; |
| 766 | } |
| 767 | |
| 768 | /* Get/set timeout ioctl() operation */ |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 769 | #ifdef CONFIG_COMPAT |
| 770 | static inline int autofs4_compat_get_set_timeout(struct autofs_sb_info *sbi, |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 771 | compat_ulong_t __user *p) |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 772 | { |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 773 | unsigned long ntimeout; |
Ian Kent | aa330dd | 2016-03-15 14:58:28 -0700 | [diff] [blame] | 774 | int rv; |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 775 | |
Ian Kent | aa330dd | 2016-03-15 14:58:28 -0700 | [diff] [blame] | 776 | rv = get_user(ntimeout, p); |
| 777 | if (rv) |
| 778 | goto error; |
| 779 | |
| 780 | rv = put_user(sbi->exp_timeout/HZ, p); |
| 781 | if (rv) |
| 782 | goto error; |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 783 | |
| 784 | if (ntimeout > UINT_MAX/HZ) |
| 785 | sbi->exp_timeout = 0; |
| 786 | else |
| 787 | sbi->exp_timeout = ntimeout * HZ; |
| 788 | |
| 789 | return 0; |
Ian Kent | aa330dd | 2016-03-15 14:58:28 -0700 | [diff] [blame] | 790 | error: |
| 791 | return rv; |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 792 | } |
| 793 | #endif |
| 794 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | static inline int autofs4_get_set_timeout(struct autofs_sb_info *sbi, |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 796 | unsigned long __user *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | unsigned long ntimeout; |
Ian Kent | aa330dd | 2016-03-15 14:58:28 -0700 | [diff] [blame] | 799 | int rv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | |
Ian Kent | aa330dd | 2016-03-15 14:58:28 -0700 | [diff] [blame] | 801 | rv = get_user(ntimeout, p); |
| 802 | if (rv) |
| 803 | goto error; |
| 804 | |
| 805 | rv = put_user(sbi->exp_timeout/HZ, p); |
| 806 | if (rv) |
| 807 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | |
Sukadev Bhattiprolu | d78e53c | 2007-05-10 22:23:06 -0700 | [diff] [blame] | 809 | if (ntimeout > ULONG_MAX/HZ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | sbi->exp_timeout = 0; |
| 811 | else |
| 812 | sbi->exp_timeout = ntimeout * HZ; |
| 813 | |
| 814 | return 0; |
Ian Kent | aa330dd | 2016-03-15 14:58:28 -0700 | [diff] [blame] | 815 | error: |
| 816 | return rv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | } |
| 818 | |
| 819 | /* Return protocol version */ |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 820 | static inline int autofs4_get_protover(struct autofs_sb_info *sbi, |
| 821 | int __user *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | { |
| 823 | return put_user(sbi->version, p); |
| 824 | } |
| 825 | |
| 826 | /* Return protocol sub version */ |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 827 | static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi, |
| 828 | int __user *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | { |
| 830 | return put_user(sbi->sub_version, p); |
| 831 | } |
| 832 | |
| 833 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | * Tells the daemon whether it can umount the autofs mount. |
| 835 | */ |
| 836 | static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p) |
| 837 | { |
| 838 | int status = 0; |
| 839 | |
Ian Kent | e3474a8 | 2006-03-27 01:14:51 -0800 | [diff] [blame] | 840 | if (may_umount(mnt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | status = 1; |
| 842 | |
Tomohiro Kusumi | b6e3795 | 2016-10-11 13:52:59 -0700 | [diff] [blame] | 843 | pr_debug("may umount %d\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
| 845 | status = put_user(status, p); |
| 846 | |
| 847 | return status; |
| 848 | } |
| 849 | |
| 850 | /* Identify autofs4_dentries - this is so we can tell if there's |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 851 | * an extra dentry refcount or not. We only hold a refcount on the |
| 852 | * dentry if its non-negative (ie, d_inode != NULL) |
| 853 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | int is_autofs4_dentry(struct dentry *dentry) |
| 855 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 856 | return dentry && d_really_is_positive(dentry) && |
David Howells | b650c85 | 2011-01-15 10:51:57 +0000 | [diff] [blame] | 857 | dentry->d_op == &autofs4_dentry_operations && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | dentry->d_fsdata != NULL; |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * ioctl()'s on the root directory is the chief method for the daemon to |
| 863 | * generate kernel reactions |
| 864 | */ |
Frederic Weisbecker | 3663df7 | 2010-05-19 15:08:17 +0200 | [diff] [blame] | 865 | static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp, |
| 866 | unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | { |
| 868 | struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb); |
| 869 | void __user *p = (void __user *)arg; |
| 870 | |
Ian Kent | 8a78d59 | 2016-03-15 14:58:45 -0700 | [diff] [blame] | 871 | pr_debug("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n", |
| 872 | cmd, arg, sbi, task_pgrp_nr(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | |
Sukadev Bhattiprolu | d78e53c | 2007-05-10 22:23:06 -0700 | [diff] [blame] | 874 | if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) || |
| 875 | _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | return -ENOTTY; |
Ian Kent | 0266725 | 2016-03-15 14:58:36 -0700 | [diff] [blame] | 877 | |
Sukadev Bhattiprolu | d78e53c | 2007-05-10 22:23:06 -0700 | [diff] [blame] | 878 | if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | return -EPERM; |
Ian Kent | 0266725 | 2016-03-15 14:58:36 -0700 | [diff] [blame] | 880 | |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 881 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */ |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 883 | return autofs4_wait_release(sbi, (autofs_wqt_t) arg, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */ |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 885 | return autofs4_wait_release(sbi, (autofs_wqt_t) arg, -ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */ |
| 887 | autofs4_catatonic_mode(sbi); |
| 888 | return 0; |
| 889 | case AUTOFS_IOC_PROTOVER: /* Get protocol version */ |
| 890 | return autofs4_get_protover(sbi, p); |
| 891 | case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */ |
| 892 | return autofs4_get_protosubver(sbi, p); |
| 893 | case AUTOFS_IOC_SETTIMEOUT: |
| 894 | return autofs4_get_set_timeout(sbi, p); |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 895 | #ifdef CONFIG_COMPAT |
| 896 | case AUTOFS_IOC_SETTIMEOUT32: |
| 897 | return autofs4_compat_get_set_timeout(sbi, p); |
| 898 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | case AUTOFS_IOC_ASKUMOUNT: |
Josef "Jeff" Sipek | a4669ed | 2006-12-08 02:36:46 -0800 | [diff] [blame] | 901 | return autofs4_ask_umount(filp->f_path.mnt, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | |
| 903 | /* return a single thing to expire */ |
| 904 | case AUTOFS_IOC_EXPIRE: |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 905 | return autofs4_expire_run(inode->i_sb, |
| 906 | filp->f_path.mnt, sbi, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | /* same as above, but can send multiple expires through pipe */ |
| 908 | case AUTOFS_IOC_EXPIRE_MULTI: |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 909 | return autofs4_expire_multi(inode->i_sb, |
| 910 | filp->f_path.mnt, sbi, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | |
| 912 | default: |
Ian Kent | e3cd806 | 2016-03-15 14:58:33 -0700 | [diff] [blame] | 913 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | } |
| 915 | } |
Frederic Weisbecker | 3663df7 | 2010-05-19 15:08:17 +0200 | [diff] [blame] | 916 | |
| 917 | static long autofs4_root_ioctl(struct file *filp, |
| 918 | unsigned int cmd, unsigned long arg) |
| 919 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 920 | struct inode *inode = file_inode(filp); |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 921 | |
Ian Kent | de47de7 | 2010-12-07 13:04:00 +0800 | [diff] [blame] | 922 | return autofs4_root_ioctl_unlocked(inode, filp, cmd, arg); |
Frederic Weisbecker | 3663df7 | 2010-05-19 15:08:17 +0200 | [diff] [blame] | 923 | } |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 924 | |
| 925 | #ifdef CONFIG_COMPAT |
| 926 | static long autofs4_root_compat_ioctl(struct file *filp, |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 927 | unsigned int cmd, unsigned long arg) |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 928 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 929 | struct inode *inode = file_inode(filp); |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 930 | int ret; |
| 931 | |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 932 | if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL) |
| 933 | ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg); |
| 934 | else |
| 935 | ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, |
Ian Kent | e9a7c2f | 2016-03-15 14:58:25 -0700 | [diff] [blame] | 936 | (unsigned long) compat_ptr(arg)); |
Arnd Bergmann | c9243f5 | 2010-07-04 00:15:07 +0200 | [diff] [blame] | 937 | |
| 938 | return ret; |
| 939 | } |
| 940 | #endif |