Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* -*- c -*- --------------------------------------------------------------- * |
| 2 | * |
| 3 | * linux/fs/autofs/expire.c |
| 4 | * |
| 5 | * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved |
| 6 | * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org> |
Ian Kent | 3a15e2a | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 7 | * Copyright 2001-2006 Ian Kent <raven@themaw.net> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * This file is part of the Linux kernel and is made available under |
| 10 | * the terms of the GNU General Public License, version 2, or at your |
| 11 | * option, any later version, incorporated herein by reference. |
| 12 | * |
| 13 | * ------------------------------------------------------------------------- */ |
| 14 | |
| 15 | #include "autofs_i.h" |
| 16 | |
| 17 | static unsigned long now; |
| 18 | |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 19 | /* Check if a dentry can be expired */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | static inline int autofs4_can_expire(struct dentry *dentry, |
| 21 | unsigned long timeout, int do_now) |
| 22 | { |
| 23 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
| 24 | |
| 25 | /* dentry in the process of being deleted */ |
| 26 | if (ino == NULL) |
| 27 | return 0; |
| 28 | |
| 29 | /* No point expiring a pending mount */ |
| 30 | if (dentry->d_flags & DCACHE_AUTOFS_PENDING) |
| 31 | return 0; |
| 32 | |
| 33 | if (!do_now) { |
| 34 | /* Too young to die */ |
| 35 | if (time_after(ino->last_used + timeout, now)) |
| 36 | return 0; |
| 37 | |
| 38 | /* update last_used here :- |
| 39 | - obviously makes sense if it is in use now |
| 40 | - less obviously, prevents rapid-fire expire |
| 41 | attempts if expire fails the first time */ |
| 42 | ino->last_used = now; |
| 43 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | return 1; |
| 45 | } |
| 46 | |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 47 | /* Check a mount point for busyness */ |
| 48 | static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | { |
Ian Kent | e0a7aae | 2006-03-27 01:14:47 -0800 | [diff] [blame] | 50 | struct dentry *top = dentry; |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 51 | int status = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | DPRINTK("dentry %p %.*s", |
| 54 | dentry, (int)dentry->d_name.len, dentry->d_name.name); |
| 55 | |
| 56 | mntget(mnt); |
| 57 | dget(dentry); |
| 58 | |
Ian Kent | 9b1e3af | 2005-06-21 17:16:38 -0700 | [diff] [blame] | 59 | if (!autofs4_follow_mount(&mnt, &dentry)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | goto done; |
| 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | /* This is an autofs submount, we can't expire it */ |
| 63 | if (is_autofs4_dentry(dentry)) |
| 64 | goto done; |
| 65 | |
Ian Kent | e0a7aae | 2006-03-27 01:14:47 -0800 | [diff] [blame] | 66 | /* Update the expiry counter if fs is busy */ |
Ian Kent | e3474a8 | 2006-03-27 01:14:51 -0800 | [diff] [blame] | 67 | if (!may_umount_tree(mnt)) { |
Ian Kent | e0a7aae | 2006-03-27 01:14:47 -0800 | [diff] [blame] | 68 | struct autofs_info *ino = autofs4_dentry_ino(top); |
| 69 | ino->last_used = jiffies; |
| 70 | goto done; |
| 71 | } |
| 72 | |
| 73 | status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | done: |
| 75 | DPRINTK("returning = %d", status); |
| 76 | mntput(mnt); |
| 77 | dput(dentry); |
| 78 | return status; |
| 79 | } |
| 80 | |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 81 | /* |
| 82 | * Calculate next entry in top down tree traversal. |
| 83 | * From next_mnt in namespace.c - elegant. |
| 84 | */ |
| 85 | static struct dentry *next_dentry(struct dentry *p, struct dentry *root) |
| 86 | { |
| 87 | struct list_head *next = p->d_subdirs.next; |
| 88 | |
| 89 | if (next == &p->d_subdirs) { |
| 90 | while (1) { |
| 91 | if (p == root) |
| 92 | return NULL; |
| 93 | next = p->d_u.d_child.next; |
| 94 | if (next != &p->d_parent->d_subdirs) |
| 95 | break; |
| 96 | p = p->d_parent; |
| 97 | } |
| 98 | } |
| 99 | return list_entry(next, struct dentry, d_u.d_child); |
| 100 | } |
| 101 | |
Ian Kent | 3a15e2a | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 102 | /* |
| 103 | * Check a direct mount point for busyness. |
| 104 | * Direct mounts have similar expiry semantics to tree mounts. |
| 105 | * The tree is not busy iff no mountpoints are busy and there are no |
| 106 | * autofs submounts. |
| 107 | */ |
| 108 | static int autofs4_direct_busy(struct vfsmount *mnt, |
| 109 | struct dentry *top, |
| 110 | unsigned long timeout, |
| 111 | int do_now) |
| 112 | { |
| 113 | DPRINTK("top %p %.*s", |
| 114 | top, (int) top->d_name.len, top->d_name.name); |
| 115 | |
| 116 | /* Not a mountpoint - give up */ |
| 117 | if (!d_mountpoint(top)) |
| 118 | return 1; |
| 119 | |
| 120 | /* If it's busy update the expiry counters */ |
| 121 | if (!may_umount_tree(mnt)) { |
| 122 | struct autofs_info *ino = autofs4_dentry_ino(top); |
| 123 | if (ino) |
| 124 | ino->last_used = jiffies; |
| 125 | return 1; |
| 126 | } |
| 127 | |
| 128 | /* Timeout of a direct mount is determined by its top dentry */ |
| 129 | if (!autofs4_can_expire(top, timeout, do_now)) |
| 130 | return 1; |
| 131 | |
| 132 | return 0; |
| 133 | } |
| 134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | /* Check a directory tree of mount points for busyness |
| 136 | * The tree is not busy iff no mountpoints are busy |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | */ |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 138 | static int autofs4_tree_busy(struct vfsmount *mnt, |
| 139 | struct dentry *top, |
| 140 | unsigned long timeout, |
| 141 | int do_now) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | { |
Ian Kent | e0a7aae | 2006-03-27 01:14:47 -0800 | [diff] [blame] | 143 | struct autofs_info *top_ino = autofs4_dentry_ino(top); |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 144 | struct dentry *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 146 | DPRINTK("top %p %.*s", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | top, (int)top->d_name.len, top->d_name.name); |
| 148 | |
| 149 | /* Negative dentry - give up */ |
| 150 | if (!simple_positive(top)) |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 151 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | spin_lock(&dcache_lock); |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 154 | for (p = top; p; p = next_dentry(p, top)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | /* Negative dentry - give up */ |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 156 | if (!simple_positive(p)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
| 159 | DPRINTK("dentry %p %.*s", |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 160 | p, (int) p->d_name.len, p->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 162 | p = dget(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | spin_unlock(&dcache_lock); |
| 164 | |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 165 | /* |
| 166 | * Is someone visiting anywhere in the subtree ? |
| 167 | * If there's no mount we need to check the usage |
| 168 | * count for the autofs dentry. |
Ian Kent | e0a7aae | 2006-03-27 01:14:47 -0800 | [diff] [blame] | 169 | * If the fs is busy update the expiry counter. |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 170 | */ |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 171 | if (d_mountpoint(p)) { |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 172 | if (autofs4_mount_busy(mnt, p)) { |
Ian Kent | e0a7aae | 2006-03-27 01:14:47 -0800 | [diff] [blame] | 173 | top_ino->last_used = jiffies; |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 174 | dput(p); |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 175 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 177 | } else { |
Ian Kent | e0a7aae | 2006-03-27 01:14:47 -0800 | [diff] [blame] | 178 | struct autofs_info *ino = autofs4_dentry_ino(p); |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 179 | unsigned int ino_count = atomic_read(&ino->count); |
| 180 | |
| 181 | /* allow for dget above and top is already dgot */ |
| 182 | if (p == top) |
| 183 | ino_count += 2; |
| 184 | else |
| 185 | ino_count++; |
| 186 | |
| 187 | if (atomic_read(&p->d_count) > ino_count) { |
Ian Kent | e0a7aae | 2006-03-27 01:14:47 -0800 | [diff] [blame] | 188 | top_ino->last_used = jiffies; |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 189 | dput(p); |
| 190 | return 1; |
| 191 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 193 | dput(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | spin_lock(&dcache_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } |
| 196 | spin_unlock(&dcache_lock); |
Ian Kent | 1aff3c8 | 2006-03-27 01:14:46 -0800 | [diff] [blame] | 197 | |
| 198 | /* Timeout of a tree mount is ultimately determined by its top dentry */ |
| 199 | if (!autofs4_can_expire(top, timeout, do_now)) |
| 200 | return 1; |
| 201 | |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 202 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | static struct dentry *autofs4_check_leaves(struct vfsmount *mnt, |
| 206 | struct dentry *parent, |
| 207 | unsigned long timeout, |
| 208 | int do_now) |
| 209 | { |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 210 | struct dentry *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | |
| 212 | DPRINTK("parent %p %.*s", |
| 213 | parent, (int)parent->d_name.len, parent->d_name.name); |
| 214 | |
| 215 | spin_lock(&dcache_lock); |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 216 | for (p = parent; p; p = next_dentry(p, parent)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | /* Negative dentry - give up */ |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 218 | if (!simple_positive(p)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | |
| 221 | DPRINTK("dentry %p %.*s", |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 222 | p, (int) p->d_name.len, p->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 224 | p = dget(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | spin_unlock(&dcache_lock); |
| 226 | |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 227 | if (d_mountpoint(p)) { |
Ian Kent | e0a7aae | 2006-03-27 01:14:47 -0800 | [diff] [blame] | 228 | /* Can we umount this guy */ |
| 229 | if (autofs4_mount_busy(mnt, p)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | goto cont; |
| 231 | |
Ian Kent | e0a7aae | 2006-03-27 01:14:47 -0800 | [diff] [blame] | 232 | /* Can we expire this guy */ |
| 233 | if (autofs4_can_expire(p, timeout, do_now)) |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 234 | return p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | } |
| 236 | cont: |
Ian Kent | 1ce12ba | 2006-03-27 01:14:45 -0800 | [diff] [blame] | 237 | dput(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | spin_lock(&dcache_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | } |
| 240 | spin_unlock(&dcache_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | return NULL; |
| 242 | } |
| 243 | |
Ian Kent | 3a15e2a | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 244 | /* Check if we can expire a direct mount (possibly a tree) */ |
| 245 | static struct dentry *autofs4_expire_direct(struct super_block *sb, |
| 246 | struct vfsmount *mnt, |
| 247 | struct autofs_sb_info *sbi, |
| 248 | int how) |
| 249 | { |
| 250 | unsigned long timeout; |
| 251 | struct dentry *root = dget(sb->s_root); |
| 252 | int do_now = how & AUTOFS_EXP_IMMEDIATE; |
| 253 | |
| 254 | if (!sbi->exp_timeout || !root) |
| 255 | return NULL; |
| 256 | |
| 257 | now = jiffies; |
| 258 | timeout = sbi->exp_timeout; |
| 259 | |
| 260 | /* Lock the tree as we must expire as a whole */ |
| 261 | spin_lock(&sbi->fs_lock); |
| 262 | if (!autofs4_direct_busy(mnt, root, timeout, do_now)) { |
| 263 | struct autofs_info *ino = autofs4_dentry_ino(root); |
| 264 | |
| 265 | /* Set this flag early to catch sys_chdir and the like */ |
| 266 | ino->flags |= AUTOFS_INF_EXPIRING; |
| 267 | spin_unlock(&sbi->fs_lock); |
| 268 | return root; |
| 269 | } |
| 270 | spin_unlock(&sbi->fs_lock); |
| 271 | dput(root); |
| 272 | |
| 273 | return NULL; |
| 274 | } |
| 275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | /* |
| 277 | * Find an eligible tree to time-out |
| 278 | * A tree is eligible if :- |
| 279 | * - it is unused by any user process |
| 280 | * - it has been unused for exp_timeout time |
| 281 | */ |
Ian Kent | 3a15e2a | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 282 | static struct dentry *autofs4_expire_indirect(struct super_block *sb, |
| 283 | struct vfsmount *mnt, |
| 284 | struct autofs_sb_info *sbi, |
| 285 | int how) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | { |
| 287 | unsigned long timeout; |
| 288 | struct dentry *root = sb->s_root; |
| 289 | struct dentry *expired = NULL; |
| 290 | struct list_head *next; |
| 291 | int do_now = how & AUTOFS_EXP_IMMEDIATE; |
| 292 | int exp_leaves = how & AUTOFS_EXP_LEAVES; |
| 293 | |
| 294 | if ( !sbi->exp_timeout || !root ) |
| 295 | return NULL; |
| 296 | |
| 297 | now = jiffies; |
| 298 | timeout = sbi->exp_timeout; |
| 299 | |
| 300 | spin_lock(&dcache_lock); |
| 301 | next = root->d_subdirs.next; |
| 302 | |
| 303 | /* On exit from the loop expire is set to a dgot dentry |
| 304 | * to expire or it's NULL */ |
| 305 | while ( next != &root->d_subdirs ) { |
Eric Dumazet | 5160ee6 | 2006-01-08 01:03:32 -0800 | [diff] [blame] | 306 | struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
| 308 | /* Negative dentry - give up */ |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 309 | if (!simple_positive(dentry)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | next = next->next; |
| 311 | continue; |
| 312 | } |
| 313 | |
| 314 | dentry = dget(dentry); |
| 315 | spin_unlock(&dcache_lock); |
| 316 | |
Ian Kent | 3a15e2a | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 317 | /* |
| 318 | * Case 1: (i) indirect mount or top level pseudo direct mount |
| 319 | * (autofs-4.1). |
| 320 | * (ii) indirect mount with offset mount, check the "/" |
| 321 | * offset (autofs-5.0+). |
| 322 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | if (d_mountpoint(dentry)) { |
| 324 | DPRINTK("checking mountpoint %p %.*s", |
| 325 | dentry, (int)dentry->d_name.len, dentry->d_name.name); |
| 326 | |
Ian Kent | e0a7aae | 2006-03-27 01:14:47 -0800 | [diff] [blame] | 327 | /* Can we umount this guy */ |
| 328 | if (autofs4_mount_busy(mnt, dentry)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | goto next; |
| 330 | |
Ian Kent | e0a7aae | 2006-03-27 01:14:47 -0800 | [diff] [blame] | 331 | /* Can we expire this guy */ |
| 332 | if (autofs4_can_expire(dentry, timeout, do_now)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | expired = dentry; |
| 334 | break; |
| 335 | } |
| 336 | goto next; |
| 337 | } |
| 338 | |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 339 | if (simple_empty(dentry)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | goto next; |
| 341 | |
| 342 | /* Case 2: tree mount, expire iff entire tree is not busy */ |
| 343 | if (!exp_leaves) { |
Ian Kent | 3a9720c | 2005-05-01 08:59:17 -0700 | [diff] [blame] | 344 | /* Lock the tree as we must expire as a whole */ |
| 345 | spin_lock(&sbi->fs_lock); |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 346 | if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) { |
Ian Kent | 3a9720c | 2005-05-01 08:59:17 -0700 | [diff] [blame] | 347 | struct autofs_info *inf = autofs4_dentry_ino(dentry); |
| 348 | |
| 349 | /* Set this flag early to catch sys_chdir and the like */ |
| 350 | inf->flags |= AUTOFS_INF_EXPIRING; |
| 351 | spin_unlock(&sbi->fs_lock); |
| 352 | expired = dentry; |
| 353 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | } |
Ian Kent | 3a9720c | 2005-05-01 08:59:17 -0700 | [diff] [blame] | 355 | spin_unlock(&sbi->fs_lock); |
Ian Kent | 3a15e2a | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 356 | /* |
| 357 | * Case 3: pseudo direct mount, expire individual leaves |
| 358 | * (autofs-4.1). |
| 359 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | } else { |
| 361 | expired = autofs4_check_leaves(mnt, dentry, timeout, do_now); |
| 362 | if (expired) { |
| 363 | dput(dentry); |
| 364 | break; |
| 365 | } |
| 366 | } |
| 367 | next: |
| 368 | dput(dentry); |
| 369 | spin_lock(&dcache_lock); |
| 370 | next = next->next; |
| 371 | } |
| 372 | |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 373 | if (expired) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | DPRINTK("returning %p %.*s", |
| 375 | expired, (int)expired->d_name.len, expired->d_name.name); |
| 376 | spin_lock(&dcache_lock); |
| 377 | list_del(&expired->d_parent->d_subdirs); |
Eric Dumazet | 5160ee6 | 2006-01-08 01:03:32 -0800 | [diff] [blame] | 378 | list_add(&expired->d_parent->d_subdirs, &expired->d_u.d_child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | spin_unlock(&dcache_lock); |
| 380 | return expired; |
| 381 | } |
| 382 | spin_unlock(&dcache_lock); |
| 383 | |
| 384 | return NULL; |
| 385 | } |
| 386 | |
| 387 | /* Perform an expiry operation */ |
| 388 | int autofs4_expire_run(struct super_block *sb, |
| 389 | struct vfsmount *mnt, |
| 390 | struct autofs_sb_info *sbi, |
| 391 | struct autofs_packet_expire __user *pkt_p) |
| 392 | { |
| 393 | struct autofs_packet_expire pkt; |
| 394 | struct dentry *dentry; |
| 395 | |
| 396 | memset(&pkt,0,sizeof pkt); |
| 397 | |
| 398 | pkt.hdr.proto_version = sbi->version; |
| 399 | pkt.hdr.type = autofs_ptype_expire; |
| 400 | |
Ian Kent | 3a15e2a | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 401 | if ((dentry = autofs4_expire_indirect(sb, mnt, sbi, 0)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | return -EAGAIN; |
| 403 | |
| 404 | pkt.len = dentry->d_name.len; |
| 405 | memcpy(pkt.name, dentry->d_name.name, pkt.len); |
| 406 | pkt.name[pkt.len] = '\0'; |
| 407 | dput(dentry); |
| 408 | |
| 409 | if ( copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)) ) |
| 410 | return -EFAULT; |
| 411 | |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | /* Call repeatedly until it returns -EAGAIN, meaning there's nothing |
| 416 | more to be done */ |
| 417 | int autofs4_expire_multi(struct super_block *sb, struct vfsmount *mnt, |
| 418 | struct autofs_sb_info *sbi, int __user *arg) |
| 419 | { |
| 420 | struct dentry *dentry; |
| 421 | int ret = -EAGAIN; |
| 422 | int do_now = 0; |
| 423 | |
| 424 | if (arg && get_user(do_now, arg)) |
| 425 | return -EFAULT; |
| 426 | |
Ian Kent | 44d53eb | 2006-03-27 01:14:56 -0800 | [diff] [blame^] | 427 | if (sbi->type & AUTOFS_TYPE_DIRECT) |
Ian Kent | 3a15e2a | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 428 | dentry = autofs4_expire_direct(sb, mnt, sbi, do_now); |
| 429 | else |
| 430 | dentry = autofs4_expire_indirect(sb, mnt, sbi, do_now); |
| 431 | |
| 432 | if (dentry) { |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 433 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
| 435 | /* This is synchronous because it makes the daemon a |
| 436 | little easier */ |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 437 | ino->flags |= AUTOFS_INF_EXPIRING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | ret = autofs4_wait(sbi, dentry, NFY_EXPIRE); |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 439 | ino->flags &= ~AUTOFS_INF_EXPIRING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | dput(dentry); |
| 441 | } |
Ian Kent | 1f5f2c3 | 2006-03-27 01:14:44 -0800 | [diff] [blame] | 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | return ret; |
| 444 | } |
| 445 | |