* linux/fs/autofs/waitq.c
*
* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
+ * Copyright 2001-2003 Ian Kent <raven@themaw.net>
*
* This file is part of the Linux kernel and is made available under
* the terms of the GNU General Public License, version 2, or at your
{
struct autofs_wait_queue *wq, *nwq;
- DPRINTK(("autofs: entering catatonic mode\n"));
+ DPRINTK("entering catatonic mode");
sbi->catatonic = 1;
wq = sbi->queues;
wq->status = -ENOENT; /* Magic is gone - report failure */
kfree(wq->name);
wq->name = NULL;
- wake_up(&wq->queue);
+ wake_up_interruptible(&wq->queue);
wq = nwq;
}
if (sbi->pipe) {
union autofs_packet_union pkt;
size_t pktsz;
- DPRINTK(("autofs_notify: wait id = 0x%08lx, name = %.*s, type=%d\n",
- wq->wait_queue_token, wq->len, wq->name, type));
+ DPRINTK("wait id = 0x%08lx, name = %.*s, type=%d",
+ wq->wait_queue_token, wq->len, wq->name, type);
memset(&pkt,0,sizeof pkt); /* For security reasons */
memcpy(ep->name, wq->name, wq->len);
ep->name[wq->len] = '\0';
} else {
- printk("autofs_notify_daemon: bad type %d!\n", type);
+ printk("autofs4_notify_daemon: bad type %d!\n", type);
return;
}
autofs4_catatonic_mode(sbi);
}
-int autofs4_wait(struct autofs_sb_info *sbi, struct qstr *name,
+static int autofs4_getpath(struct autofs_sb_info *sbi,
+ struct dentry *dentry, char **name)
+{
+ struct dentry *root = sbi->sb->s_root;
+ struct dentry *tmp;
+ char *buf = *name;
+ char *p;
+ int len = 0;
+
+ spin_lock(&dcache_lock);
+ for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent)
+ len += tmp->d_name.len + 1;
+
+ if (--len > NAME_MAX) {
+ spin_unlock(&dcache_lock);
+ return 0;
+ }
+
+ *(buf + len) = '\0';
+ p = buf + len - dentry->d_name.len;
+ strncpy(p, dentry->d_name.name, dentry->d_name.len);
+
+ for (tmp = dentry->d_parent; tmp != root ; tmp = tmp->d_parent) {
+ *(--p) = '/';
+ p -= tmp->d_name.len;
+ strncpy(p, tmp->d_name.name, tmp->d_name.len);
+ }
+ spin_unlock(&dcache_lock);
+
+ return len;
+}
+
+int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
enum autofs_notify notify)
{
struct autofs_wait_queue *wq;
- int status;
+ char *name;
+ int len, status;
/* In catatonic mode, we don't wait for nobody */
if ( sbi->catatonic )
return -ENOENT;
- /* We shouldn't be able to get here, but just in case */
- if ( name->len > NAME_MAX )
+ name = kmalloc(NAME_MAX + 1, GFP_KERNEL);
+ if (!name)
+ return -ENOMEM;
+
+ len = autofs4_getpath(sbi, dentry, &name);
+ if (!len) {
+ kfree(name);
return -ENOENT;
+ }
+
+ if (down_interruptible(&sbi->wq_sem)) {
+ kfree(name);
+ return -EINTR;
+ }
- for ( wq = sbi->queues ; wq ; wq = wq->next ) {
- if ( wq->hash == name->hash &&
- wq->len == name->len &&
- wq->name && !memcmp(wq->name,name->name,name->len) )
+ for (wq = sbi->queues ; wq ; wq = wq->next) {
+ if (wq->hash == dentry->d_name.hash &&
+ wq->len == len &&
+ wq->name && !memcmp(wq->name, name, len))
break;
}
-
+
if ( !wq ) {
/* Create a new wait queue */
wq = kmalloc(sizeof(struct autofs_wait_queue),GFP_KERNEL);
- if ( !wq )
- return -ENOMEM;
-
- wq->name = kmalloc(name->len,GFP_KERNEL);
- if ( !wq->name ) {
- kfree(wq);
+ if ( !wq ) {
+ kfree(name);
+ up(&sbi->wq_sem);
return -ENOMEM;
}
+
wq->wait_queue_token = autofs4_next_wait_queue;
if (++autofs4_next_wait_queue == 0)
autofs4_next_wait_queue = 1;
- init_waitqueue_head(&wq->queue);
- wq->hash = name->hash;
- wq->len = name->len;
- wq->status = -EINTR; /* Status return if interrupted */
- memcpy(wq->name, name->name, name->len);
wq->next = sbi->queues;
sbi->queues = wq;
+ init_waitqueue_head(&wq->queue);
+ wq->hash = dentry->d_name.hash;
+ wq->name = name;
+ wq->len = len;
+ wq->status = -EINTR; /* Status return if interrupted */
+ atomic_set(&wq->wait_ctr, 2);
+ up(&sbi->wq_sem);
- DPRINTK(("autofs_wait: new wait id = 0x%08lx, name = %.*s, nfy=%d\n",
- wq->wait_queue_token, wq->len, wq->name, notify));
+ DPRINTK("new wait id = 0x%08lx, name = %.*s, nfy=%d",
+ (unsigned long) wq->wait_queue_token, wq->len, wq->name, notify);
/* autofs4_notify_daemon() may block */
- wq->wait_ctr = 2;
if (notify != NFY_NONE) {
autofs4_notify_daemon(sbi,wq,
- notify == NFY_MOUNT ? autofs_ptype_missing :
- autofs_ptype_expire_multi);
+ notify == NFY_MOUNT ?
+ autofs_ptype_missing :
+ autofs_ptype_expire_multi);
}
} else {
- wq->wait_ctr++;
- DPRINTK(("autofs_wait: existing wait id = 0x%08lx, name = %.*s, nfy=%d\n",
- wq->wait_queue_token, wq->len, wq->name, notify));
+ atomic_inc(&wq->wait_ctr);
+ up(&sbi->wq_sem);
+ DPRINTK("existing wait id = 0x%08lx, name = %.*s, nfy=%d",
+ (unsigned long) wq->wait_queue_token, wq->len, wq->name, notify);
}
/* wq->name is NULL if and only if the lock is already released */
recalc_sigpending();
spin_unlock_irqrestore(¤t->sighand->siglock, irqflags);
- interruptible_sleep_on(&wq->queue);
+ wait_event_interruptible(wq->queue, wq->name == NULL);
spin_lock_irqsave(¤t->sighand->siglock, irqflags);
current->blocked = oldset;
recalc_sigpending();
spin_unlock_irqrestore(¤t->sighand->siglock, irqflags);
} else {
- DPRINTK(("autofs_wait: skipped sleeping\n"));
+ DPRINTK("skipped sleeping");
}
status = wq->status;
- if (--wq->wait_ctr == 0) /* Are we the last process to need status? */
+ /* Are we the last process to need status? */
+ if (atomic_dec_and_test(&wq->wait_ctr))
kfree(wq);
return status;
{
struct autofs_wait_queue *wq, **wql;
+ down(&sbi->wq_sem);
for ( wql = &sbi->queues ; (wq = *wql) ; wql = &wq->next ) {
if ( wq->wait_queue_token == wait_queue_token )
break;
}
- if ( !wq )
+
+ if ( !wq ) {
+ up(&sbi->wq_sem);
return -EINVAL;
+ }
*wql = wq->next; /* Unlink from chain */
+ up(&sbi->wq_sem);
kfree(wq->name);
wq->name = NULL; /* Do not wait on this queue */
wq->status = status;
- if (--wq->wait_ctr == 0) /* Is anyone still waiting for this guy? */
+ if (atomic_dec_and_test(&wq->wait_ctr)) /* Is anyone still waiting for this guy? */
kfree(wq);
else
- wake_up(&wq->queue);
+ wake_up_interruptible(&wq->queue);
return 0;
}
git://git.onelab.eu / linux-2.6.git / blobdiff