Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* -*- c -*- --------------------------------------------------------------- * |
| 2 | * |
| 3 | * linux/fs/autofs/waitq.c |
| 4 | * |
| 5 | * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 6 | * Copyright 2001-2006 Ian Kent <raven@themaw.net> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
| 8 | * This file is part of the Linux kernel and is made available under |
| 9 | * the terms of the GNU General Public License, version 2, or at your |
| 10 | * option, any later version, incorporated herein by reference. |
| 11 | * |
| 12 | * ------------------------------------------------------------------------- */ |
| 13 | |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/time.h> |
| 16 | #include <linux/signal.h> |
| 17 | #include <linux/file.h> |
| 18 | #include "autofs_i.h" |
| 19 | |
| 20 | /* We make this a static variable rather than a part of the superblock; it |
| 21 | is better if we don't reassign numbers easily even across filesystems */ |
| 22 | static autofs_wqt_t autofs4_next_wait_queue = 1; |
| 23 | |
| 24 | /* These are the signals we allow interrupting a pending mount */ |
| 25 | #define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT)) |
| 26 | |
| 27 | void autofs4_catatonic_mode(struct autofs_sb_info *sbi) |
| 28 | { |
| 29 | struct autofs_wait_queue *wq, *nwq; |
| 30 | |
Ian Kent | 5a11d4d | 2008-07-23 21:30:17 -0700 | [diff] [blame] | 31 | mutex_lock(&sbi->wq_mutex); |
| 32 | if (sbi->catatonic) { |
| 33 | mutex_unlock(&sbi->wq_mutex); |
| 34 | return; |
| 35 | } |
| 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | DPRINTK("entering catatonic mode"); |
| 38 | |
| 39 | sbi->catatonic = 1; |
| 40 | wq = sbi->queues; |
| 41 | sbi->queues = NULL; /* Erase all wait queues */ |
Ian Kent | e77fbdd | 2006-03-27 01:14:49 -0800 | [diff] [blame] | 42 | while (wq) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | nwq = wq->next; |
| 44 | wq->status = -ENOENT; /* Magic is gone - report failure */ |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 45 | if (wq->name.name) { |
| 46 | kfree(wq->name.name); |
| 47 | wq->name.name = NULL; |
| 48 | } |
Ian Kent | 296f7bf | 2008-07-23 21:30:21 -0700 | [diff] [blame] | 49 | wq->wait_ctr--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | wake_up_interruptible(&wq->queue); |
| 51 | wq = nwq; |
| 52 | } |
Ian Kent | ba8df43 | 2006-11-14 02:03:29 -0800 | [diff] [blame] | 53 | fput(sbi->pipe); /* Close the pipe */ |
| 54 | sbi->pipe = NULL; |
Ian Kent | 5a11d4d | 2008-07-23 21:30:17 -0700 | [diff] [blame] | 55 | sbi->pipefd = -1; |
| 56 | mutex_unlock(&sbi->wq_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | } |
| 58 | |
| 59 | static int autofs4_write(struct file *file, const void *addr, int bytes) |
| 60 | { |
| 61 | unsigned long sigpipe, flags; |
| 62 | mm_segment_t fs; |
| 63 | const char *data = (const char *)addr; |
| 64 | ssize_t wr = 0; |
| 65 | |
| 66 | /** WARNING: this is not safe for writing more than PIPE_BUF bytes! **/ |
| 67 | |
| 68 | sigpipe = sigismember(¤t->pending.signal, SIGPIPE); |
| 69 | |
| 70 | /* Save pointer to user space and point back to kernel space */ |
| 71 | fs = get_fs(); |
| 72 | set_fs(KERNEL_DS); |
| 73 | |
| 74 | while (bytes && |
| 75 | (wr = file->f_op->write(file,data,bytes,&file->f_pos)) > 0) { |
| 76 | data += wr; |
| 77 | bytes -= wr; |
| 78 | } |
| 79 | |
| 80 | set_fs(fs); |
| 81 | |
| 82 | /* Keep the currently executing process from receiving a |
| 83 | SIGPIPE unless it was already supposed to get one */ |
| 84 | if (wr == -EPIPE && !sigpipe) { |
| 85 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
| 86 | sigdelset(¤t->pending.signal, SIGPIPE); |
| 87 | recalc_sigpending(); |
| 88 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
| 89 | } |
| 90 | |
| 91 | return (bytes > 0); |
| 92 | } |
| 93 | |
| 94 | static void autofs4_notify_daemon(struct autofs_sb_info *sbi, |
| 95 | struct autofs_wait_queue *wq, |
| 96 | int type) |
| 97 | { |
Ian Kent | e851447 | 2007-02-20 13:58:09 -0800 | [diff] [blame] | 98 | union { |
| 99 | struct autofs_packet_hdr hdr; |
| 100 | union autofs_packet_union v4_pkt; |
| 101 | union autofs_v5_packet_union v5_pkt; |
| 102 | } pkt; |
Ian Kent | e64be33 | 2008-07-23 21:30:20 -0700 | [diff] [blame] | 103 | struct file *pipe = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | size_t pktsz; |
| 105 | |
| 106 | DPRINTK("wait id = 0x%08lx, name = %.*s, type=%d", |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 107 | wq->wait_queue_token, wq->name.len, wq->name.name, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
| 109 | memset(&pkt,0,sizeof pkt); /* For security reasons */ |
| 110 | |
| 111 | pkt.hdr.proto_version = sbi->version; |
| 112 | pkt.hdr.type = type; |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 113 | switch (type) { |
| 114 | /* Kernel protocol v4 missing and expire packets */ |
| 115 | case autofs_ptype_missing: |
| 116 | { |
Ian Kent | e851447 | 2007-02-20 13:58:09 -0800 | [diff] [blame] | 117 | struct autofs_packet_missing *mp = &pkt.v4_pkt.missing; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | pktsz = sizeof(*mp); |
| 120 | |
| 121 | mp->wait_queue_token = wq->wait_queue_token; |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 122 | mp->len = wq->name.len; |
| 123 | memcpy(mp->name, wq->name.name, wq->name.len); |
| 124 | mp->name[wq->name.len] = '\0'; |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 125 | break; |
| 126 | } |
| 127 | case autofs_ptype_expire_multi: |
| 128 | { |
Ian Kent | e851447 | 2007-02-20 13:58:09 -0800 | [diff] [blame] | 129 | struct autofs_packet_expire_multi *ep = &pkt.v4_pkt.expire_multi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | pktsz = sizeof(*ep); |
| 132 | |
| 133 | ep->wait_queue_token = wq->wait_queue_token; |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 134 | ep->len = wq->name.len; |
| 135 | memcpy(ep->name, wq->name.name, wq->name.len); |
| 136 | ep->name[wq->name.len] = '\0'; |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 137 | break; |
| 138 | } |
| 139 | /* |
| 140 | * Kernel protocol v5 packet for handling indirect and direct |
| 141 | * mount missing and expire requests |
| 142 | */ |
| 143 | case autofs_ptype_missing_indirect: |
| 144 | case autofs_ptype_expire_indirect: |
| 145 | case autofs_ptype_missing_direct: |
| 146 | case autofs_ptype_expire_direct: |
| 147 | { |
Ian Kent | e851447 | 2007-02-20 13:58:09 -0800 | [diff] [blame] | 148 | struct autofs_v5_packet *packet = &pkt.v5_pkt.v5_packet; |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 149 | |
| 150 | pktsz = sizeof(*packet); |
| 151 | |
| 152 | packet->wait_queue_token = wq->wait_queue_token; |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 153 | packet->len = wq->name.len; |
| 154 | memcpy(packet->name, wq->name.name, wq->name.len); |
| 155 | packet->name[wq->name.len] = '\0'; |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 156 | packet->dev = wq->dev; |
| 157 | packet->ino = wq->ino; |
| 158 | packet->uid = wq->uid; |
| 159 | packet->gid = wq->gid; |
| 160 | packet->pid = wq->pid; |
| 161 | packet->tgid = wq->tgid; |
| 162 | break; |
| 163 | } |
| 164 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | printk("autofs4_notify_daemon: bad type %d!\n", type); |
| 166 | return; |
| 167 | } |
| 168 | |
Ian Kent | e64be33 | 2008-07-23 21:30:20 -0700 | [diff] [blame] | 169 | /* Check if we have become catatonic */ |
| 170 | mutex_lock(&sbi->wq_mutex); |
| 171 | if (!sbi->catatonic) { |
| 172 | pipe = sbi->pipe; |
| 173 | get_file(pipe); |
| 174 | } |
| 175 | mutex_unlock(&sbi->wq_mutex); |
| 176 | |
| 177 | if (pipe) { |
| 178 | if (autofs4_write(pipe, &pkt, pktsz)) |
| 179 | autofs4_catatonic_mode(sbi); |
| 180 | fput(pipe); |
| 181 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | static int autofs4_getpath(struct autofs_sb_info *sbi, |
| 185 | struct dentry *dentry, char **name) |
| 186 | { |
| 187 | struct dentry *root = sbi->sb->s_root; |
| 188 | struct dentry *tmp; |
| 189 | char *buf = *name; |
| 190 | char *p; |
| 191 | int len = 0; |
| 192 | |
| 193 | spin_lock(&dcache_lock); |
| 194 | for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent) |
| 195 | len += tmp->d_name.len + 1; |
| 196 | |
Ian Kent | cab0936 | 2008-05-01 04:35:07 -0700 | [diff] [blame] | 197 | if (!len || --len > NAME_MAX) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | spin_unlock(&dcache_lock); |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | *(buf + len) = '\0'; |
| 203 | p = buf + len - dentry->d_name.len; |
| 204 | strncpy(p, dentry->d_name.name, dentry->d_name.len); |
| 205 | |
| 206 | for (tmp = dentry->d_parent; tmp != root ; tmp = tmp->d_parent) { |
| 207 | *(--p) = '/'; |
| 208 | p -= tmp->d_name.len; |
| 209 | strncpy(p, tmp->d_name.name, tmp->d_name.len); |
| 210 | } |
| 211 | spin_unlock(&dcache_lock); |
| 212 | |
| 213 | return len; |
| 214 | } |
| 215 | |
Ian Kent | a537055 | 2006-05-15 09:43:51 -0700 | [diff] [blame] | 216 | static struct autofs_wait_queue * |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 217 | autofs4_find_wait(struct autofs_sb_info *sbi, struct qstr *qstr) |
Ian Kent | a537055 | 2006-05-15 09:43:51 -0700 | [diff] [blame] | 218 | { |
| 219 | struct autofs_wait_queue *wq; |
| 220 | |
| 221 | for (wq = sbi->queues; wq; wq = wq->next) { |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 222 | if (wq->name.hash == qstr->hash && |
| 223 | wq->name.len == qstr->len && |
| 224 | wq->name.name && |
| 225 | !memcmp(wq->name.name, qstr->name, qstr->len)) |
Ian Kent | a537055 | 2006-05-15 09:43:51 -0700 | [diff] [blame] | 226 | break; |
| 227 | } |
| 228 | return wq; |
| 229 | } |
| 230 | |
Ian Kent | a1362fe | 2008-07-23 21:30:19 -0700 | [diff] [blame] | 231 | /* |
| 232 | * Check if we have a valid request. |
| 233 | * Returns |
| 234 | * 1 if the request should continue. |
| 235 | * In this case we can return an autofs_wait_queue entry if one is |
| 236 | * found or NULL to idicate a new wait needs to be created. |
| 237 | * 0 or a negative errno if the request shouldn't continue. |
| 238 | */ |
| 239 | static int validate_request(struct autofs_wait_queue **wait, |
| 240 | struct autofs_sb_info *sbi, |
| 241 | struct qstr *qstr, |
| 242 | struct dentry*dentry, enum autofs_notify notify) |
| 243 | { |
| 244 | struct autofs_wait_queue *wq; |
| 245 | struct autofs_info *ino; |
| 246 | |
| 247 | /* Wait in progress, continue; */ |
| 248 | wq = autofs4_find_wait(sbi, qstr); |
| 249 | if (wq) { |
| 250 | *wait = wq; |
| 251 | return 1; |
| 252 | } |
| 253 | |
| 254 | *wait = NULL; |
| 255 | |
| 256 | /* If we don't yet have any info this is a new request */ |
| 257 | ino = autofs4_dentry_ino(dentry); |
| 258 | if (!ino) |
| 259 | return 1; |
| 260 | |
| 261 | /* |
| 262 | * If we've been asked to wait on an existing expire (NFY_NONE) |
| 263 | * but there is no wait in the queue ... |
| 264 | */ |
| 265 | if (notify == NFY_NONE) { |
| 266 | /* |
| 267 | * Either we've betean the pending expire to post it's |
| 268 | * wait or it finished while we waited on the mutex. |
| 269 | * So we need to wait till either, the wait appears |
| 270 | * or the expire finishes. |
| 271 | */ |
| 272 | |
| 273 | while (ino->flags & AUTOFS_INF_EXPIRING) { |
| 274 | mutex_unlock(&sbi->wq_mutex); |
| 275 | schedule_timeout_interruptible(HZ/10); |
| 276 | if (mutex_lock_interruptible(&sbi->wq_mutex)) |
| 277 | return -EINTR; |
| 278 | |
| 279 | wq = autofs4_find_wait(sbi, qstr); |
| 280 | if (wq) { |
| 281 | *wait = wq; |
| 282 | return 1; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | /* |
| 287 | * Not ideal but the status has already gone. Of the two |
| 288 | * cases where we wait on NFY_NONE neither depend on the |
| 289 | * return status of the wait. |
| 290 | */ |
| 291 | return 0; |
| 292 | } |
| 293 | |
| 294 | /* |
| 295 | * If we've been asked to trigger a mount and the request |
| 296 | * completed while we waited on the mutex ... |
| 297 | */ |
| 298 | if (notify == NFY_MOUNT) { |
| 299 | /* |
| 300 | * If the dentry isn't hashed just go ahead and try the |
| 301 | * mount again with a new wait (not much else we can do). |
| 302 | */ |
| 303 | if (!d_unhashed(dentry)) { |
| 304 | /* |
| 305 | * But if the dentry is hashed, that means that we |
| 306 | * got here through the revalidate path. Thus, we |
| 307 | * need to check if the dentry has been mounted |
| 308 | * while we waited on the wq_mutex. If it has, |
| 309 | * simply return success. |
| 310 | */ |
| 311 | if (d_mountpoint(dentry)) |
| 312 | return 0; |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | return 1; |
| 317 | } |
| 318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry, |
| 320 | enum autofs_notify notify) |
| 321 | { |
| 322 | struct autofs_wait_queue *wq; |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 323 | struct qstr qstr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | char *name; |
Ian Kent | a1362fe | 2008-07-23 21:30:19 -0700 | [diff] [blame] | 325 | int status, ret, type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
| 327 | /* In catatonic mode, we don't wait for nobody */ |
Ian Kent | e77fbdd | 2006-03-27 01:14:49 -0800 | [diff] [blame] | 328 | if (sbi->catatonic) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | return -ENOENT; |
Ian Kent | a1362fe | 2008-07-23 21:30:19 -0700 | [diff] [blame] | 330 | |
Ian Kent | c72305b | 2008-07-23 21:30:23 -0700 | [diff] [blame] | 331 | if (!dentry->d_inode) { |
| 332 | /* |
| 333 | * A wait for a negative dentry is invalid for certain |
| 334 | * cases. A direct or offset mount "always" has its mount |
| 335 | * point directory created and so the request dentry must |
| 336 | * be positive or the map key doesn't exist. The situation |
| 337 | * is very similar for indirect mounts except only dentrys |
| 338 | * in the root of the autofs file system may be negative. |
| 339 | */ |
Ian Kent | a92daf6 | 2009-01-06 14:42:08 -0800 | [diff] [blame^] | 340 | if (autofs_type_trigger(sbi->type)) |
Ian Kent | c72305b | 2008-07-23 21:30:23 -0700 | [diff] [blame] | 341 | return -ENOENT; |
| 342 | else if (!IS_ROOT(dentry->d_parent)) |
| 343 | return -ENOENT; |
| 344 | } |
Ian Kent | eb3b176 | 2008-07-23 21:30:22 -0700 | [diff] [blame] | 345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | name = kmalloc(NAME_MAX + 1, GFP_KERNEL); |
| 347 | if (!name) |
| 348 | return -ENOMEM; |
| 349 | |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 350 | /* If this is a direct mount request create a dummy name */ |
Ian Kent | a92daf6 | 2009-01-06 14:42:08 -0800 | [diff] [blame^] | 351 | if (IS_ROOT(dentry) && autofs_type_trigger(sbi->type)) |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 352 | qstr.len = sprintf(name, "%p", dentry); |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 353 | else { |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 354 | qstr.len = autofs4_getpath(sbi, dentry, &name); |
| 355 | if (!qstr.len) { |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 356 | kfree(name); |
| 357 | return -ENOENT; |
| 358 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | } |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 360 | qstr.name = name; |
| 361 | qstr.hash = full_name_hash(name, qstr.len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
Ian Kent | f4c7da0 | 2008-07-23 21:30:19 -0700 | [diff] [blame] | 363 | if (mutex_lock_interruptible(&sbi->wq_mutex)) { |
| 364 | kfree(qstr.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | return -EINTR; |
Ian Kent | f4c7da0 | 2008-07-23 21:30:19 -0700 | [diff] [blame] | 366 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
Ian Kent | a1362fe | 2008-07-23 21:30:19 -0700 | [diff] [blame] | 368 | ret = validate_request(&wq, sbi, &qstr, dentry, notify); |
| 369 | if (ret <= 0) { |
| 370 | if (ret == 0) |
Ian Kent | a537055 | 2006-05-15 09:43:51 -0700 | [diff] [blame] | 371 | mutex_unlock(&sbi->wq_mutex); |
Ian Kent | a1362fe | 2008-07-23 21:30:19 -0700 | [diff] [blame] | 372 | kfree(qstr.name); |
| 373 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | } |
| 375 | |
Ian Kent | e77fbdd | 2006-03-27 01:14:49 -0800 | [diff] [blame] | 376 | if (!wq) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | /* Create a new wait queue */ |
| 378 | wq = kmalloc(sizeof(struct autofs_wait_queue),GFP_KERNEL); |
Ian Kent | e77fbdd | 2006-03-27 01:14:49 -0800 | [diff] [blame] | 379 | if (!wq) { |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 380 | kfree(qstr.name); |
Ingo Molnar | 1d5599e | 2006-03-23 03:00:41 -0800 | [diff] [blame] | 381 | mutex_unlock(&sbi->wq_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | return -ENOMEM; |
| 383 | } |
| 384 | |
| 385 | wq->wait_queue_token = autofs4_next_wait_queue; |
| 386 | if (++autofs4_next_wait_queue == 0) |
| 387 | autofs4_next_wait_queue = 1; |
| 388 | wq->next = sbi->queues; |
| 389 | sbi->queues = wq; |
| 390 | init_waitqueue_head(&wq->queue); |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 391 | memcpy(&wq->name, &qstr, sizeof(struct qstr)); |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 392 | wq->dev = autofs4_get_dev(sbi); |
| 393 | wq->ino = autofs4_get_ino(sbi); |
David Howells | 0eb790e | 2008-11-14 10:38:46 +1100 | [diff] [blame] | 394 | wq->uid = current_uid(); |
| 395 | wq->gid = current_gid(); |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 396 | wq->pid = current->pid; |
| 397 | wq->tgid = current->tgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | wq->status = -EINTR; /* Status return if interrupted */ |
Ian Kent | 296f7bf | 2008-07-23 21:30:21 -0700 | [diff] [blame] | 399 | wq->wait_ctr = 2; |
Ingo Molnar | 1d5599e | 2006-03-23 03:00:41 -0800 | [diff] [blame] | 400 | mutex_unlock(&sbi->wq_mutex); |
Ian Kent | 3e7b191 | 2006-03-27 01:14:59 -0800 | [diff] [blame] | 401 | |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 402 | if (sbi->version < 5) { |
| 403 | if (notify == NFY_MOUNT) |
| 404 | type = autofs_ptype_missing; |
| 405 | else |
| 406 | type = autofs_ptype_expire_multi; |
| 407 | } else { |
| 408 | if (notify == NFY_MOUNT) |
Ian Kent | a92daf6 | 2009-01-06 14:42:08 -0800 | [diff] [blame^] | 409 | type = autofs_type_trigger(sbi->type) ? |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 410 | autofs_ptype_missing_direct : |
| 411 | autofs_ptype_missing_indirect; |
| 412 | else |
Ian Kent | a92daf6 | 2009-01-06 14:42:08 -0800 | [diff] [blame^] | 413 | type = autofs_type_trigger(sbi->type) ? |
Ian Kent | 5c0a32f | 2006-03-27 01:14:55 -0800 | [diff] [blame] | 414 | autofs_ptype_expire_direct : |
| 415 | autofs_ptype_expire_indirect; |
| 416 | } |
Ian Kent | 4dcd00b | 2005-05-01 08:59:16 -0700 | [diff] [blame] | 417 | |
Ian Kent | 682d4fc | 2005-07-07 17:57:02 -0700 | [diff] [blame] | 418 | DPRINTK("new wait id = 0x%08lx, name = %.*s, nfy=%d\n", |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 419 | (unsigned long) wq->wait_queue_token, wq->name.len, |
| 420 | wq->name.name, notify); |
Ian Kent | 4dcd00b | 2005-05-01 08:59:16 -0700 | [diff] [blame] | 421 | |
| 422 | /* autofs4_notify_daemon() may block */ |
| 423 | autofs4_notify_daemon(sbi, wq, type); |
Ian Kent | a537055 | 2006-05-15 09:43:51 -0700 | [diff] [blame] | 424 | } else { |
Ian Kent | 296f7bf | 2008-07-23 21:30:21 -0700 | [diff] [blame] | 425 | wq->wait_ctr++; |
Ian Kent | a537055 | 2006-05-15 09:43:51 -0700 | [diff] [blame] | 426 | mutex_unlock(&sbi->wq_mutex); |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 427 | kfree(qstr.name); |
Ian Kent | a537055 | 2006-05-15 09:43:51 -0700 | [diff] [blame] | 428 | DPRINTK("existing wait id = 0x%08lx, name = %.*s, nfy=%d", |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 429 | (unsigned long) wq->wait_queue_token, wq->name.len, |
| 430 | wq->name.name, notify); |
Ian Kent | 4dcd00b | 2005-05-01 08:59:16 -0700 | [diff] [blame] | 431 | } |
| 432 | |
Ian Kent | 5a11d4d | 2008-07-23 21:30:17 -0700 | [diff] [blame] | 433 | /* |
| 434 | * wq->name.name is NULL iff the lock is already released |
| 435 | * or the mount has been made catatonic. |
| 436 | */ |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 437 | if (wq->name.name) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | /* Block all but "shutdown" signals while waiting */ |
| 439 | sigset_t oldset; |
| 440 | unsigned long irqflags; |
| 441 | |
| 442 | spin_lock_irqsave(¤t->sighand->siglock, irqflags); |
| 443 | oldset = current->blocked; |
| 444 | siginitsetinv(¤t->blocked, SHUTDOWN_SIGS & ~oldset.sig[0]); |
| 445 | recalc_sigpending(); |
| 446 | spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); |
| 447 | |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 448 | wait_event_interruptible(wq->queue, wq->name.name == NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | |
| 450 | spin_lock_irqsave(¤t->sighand->siglock, irqflags); |
| 451 | current->blocked = oldset; |
| 452 | recalc_sigpending(); |
| 453 | spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); |
| 454 | } else { |
| 455 | DPRINTK("skipped sleeping"); |
| 456 | } |
| 457 | |
| 458 | status = wq->status; |
| 459 | |
Ian Kent | c0f54d3 | 2008-10-15 22:02:52 -0700 | [diff] [blame] | 460 | /* |
| 461 | * For direct and offset mounts we need to track the requester's |
| 462 | * uid and gid in the dentry info struct. This is so it can be |
| 463 | * supplied, on request, by the misc device ioctl interface. |
| 464 | * This is needed during daemon resatart when reconnecting |
| 465 | * to existing, active, autofs mounts. The uid and gid (and |
| 466 | * related string values) may be used for macro substitution |
| 467 | * in autofs mount maps. |
| 468 | */ |
| 469 | if (!status) { |
| 470 | struct autofs_info *ino; |
| 471 | struct dentry *de = NULL; |
| 472 | |
| 473 | /* direct mount or browsable map */ |
| 474 | ino = autofs4_dentry_ino(dentry); |
| 475 | if (!ino) { |
| 476 | /* If not lookup actual dentry used */ |
| 477 | de = d_lookup(dentry->d_parent, &dentry->d_name); |
| 478 | if (de) |
| 479 | ino = autofs4_dentry_ino(de); |
| 480 | } |
| 481 | |
| 482 | /* Set mount requester */ |
| 483 | if (ino) { |
| 484 | spin_lock(&sbi->fs_lock); |
| 485 | ino->uid = wq->uid; |
| 486 | ino->gid = wq->gid; |
| 487 | spin_unlock(&sbi->fs_lock); |
| 488 | } |
| 489 | |
| 490 | if (de) |
| 491 | dput(de); |
| 492 | } |
| 493 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | /* Are we the last process to need status? */ |
Ian Kent | 296f7bf | 2008-07-23 21:30:21 -0700 | [diff] [blame] | 495 | mutex_lock(&sbi->wq_mutex); |
| 496 | if (!--wq->wait_ctr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | kfree(wq); |
Ian Kent | 296f7bf | 2008-07-23 21:30:21 -0700 | [diff] [blame] | 498 | mutex_unlock(&sbi->wq_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | |
| 500 | return status; |
| 501 | } |
| 502 | |
| 503 | |
| 504 | int autofs4_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_token, int status) |
| 505 | { |
| 506 | struct autofs_wait_queue *wq, **wql; |
| 507 | |
Ingo Molnar | 1d5599e | 2006-03-23 03:00:41 -0800 | [diff] [blame] | 508 | mutex_lock(&sbi->wq_mutex); |
Stephen Hemminger | c80544d | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 509 | for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) { |
Ian Kent | e77fbdd | 2006-03-27 01:14:49 -0800 | [diff] [blame] | 510 | if (wq->wait_queue_token == wait_queue_token) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | break; |
| 512 | } |
| 513 | |
Ian Kent | e77fbdd | 2006-03-27 01:14:49 -0800 | [diff] [blame] | 514 | if (!wq) { |
Ingo Molnar | 1d5599e | 2006-03-23 03:00:41 -0800 | [diff] [blame] | 515 | mutex_unlock(&sbi->wq_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | return -EINVAL; |
| 517 | } |
| 518 | |
| 519 | *wql = wq->next; /* Unlink from chain */ |
Jeff Moyer | 70b52a0 | 2008-07-23 21:30:16 -0700 | [diff] [blame] | 520 | kfree(wq->name.name); |
| 521 | wq->name.name = NULL; /* Do not wait on this queue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | wq->status = status; |
Ian Kent | 296f7bf | 2008-07-23 21:30:21 -0700 | [diff] [blame] | 523 | wake_up_interruptible(&wq->queue); |
| 524 | if (!--wq->wait_ctr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | kfree(wq); |
Ian Kent | 296f7bf | 2008-07-23 21:30:21 -0700 | [diff] [blame] | 526 | mutex_unlock(&sbi->wq_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | |
| 528 | return 0; |
| 529 | } |
| 530 | |