autofs: delete fs/autofs4 source files

Delete the now unused autofs4 module files.

Link: http://lkml.kernel.org/r/152626707391.28589.3553309771262313504.stgit@pluto.themaw.net
Signed-off-by: Ian Kent <raven@themaw.net>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 559 deletions

diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
deleted file mode 100644
index 8a566fa66afe..000000000000
--- a/fs/autofs4/waitq.c
+++ /dev/null
@@ -1,559 +0,0 @@
-/*
- * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
- * Copyright 2001-2006 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
- * option, any later version, incorporated herein by reference.
- */
-
-#include <linux/slab.h>
-#include <linux/time.h>
-#include <linux/signal.h>
-#include <linux/sched/signal.h>
-#include <linux/file.h>
-#include "autofs_i.h"
-
-/* We make this a static variable rather than a part of the superblock; it
- * is better if we don't reassign numbers easily even across filesystems
- */
-static autofs_wqt_t autofs_next_wait_queue = 1;
-
-void autofs_catatonic_mode(struct autofs_sb_info *sbi)
-{
-	struct autofs_wait_queue *wq, *nwq;
-
-	mutex_lock(&sbi->wq_mutex);
-	if (sbi->catatonic) {
-		mutex_unlock(&sbi->wq_mutex);
-		return;
-	}
-
-	pr_debug("entering catatonic mode\n");
-
-	sbi->catatonic = 1;
-	wq = sbi->queues;
-	sbi->queues = NULL;	/* Erase all wait queues */
-	while (wq) {
-		nwq = wq->next;
-		wq->status = -ENOENT; /* Magic is gone - report failure */
-		kfree(wq->name.name);
-		wq->name.name = NULL;
-		wq->wait_ctr--;
-		wake_up_interruptible(&wq->queue);
-		wq = nwq;
-	}
-	fput(sbi->pipe);	/* Close the pipe */
-	sbi->pipe = NULL;
-	sbi->pipefd = -1;
-	mutex_unlock(&sbi->wq_mutex);
-}
-
-static int autofs_write(struct autofs_sb_info *sbi,
-			struct file *file, const void *addr, int bytes)
-{
-	unsigned long sigpipe, flags;
-	const char *data = (const char *)addr;
-	ssize_t wr = 0;
-
-	sigpipe = sigismember(&current->pending.signal, SIGPIPE);
-
-	mutex_lock(&sbi->pipe_mutex);
-	while (bytes) {
-		wr = __kernel_write(file, data, bytes, &file->f_pos);
-		if (wr <= 0)
-			break;
-		data += wr;
-		bytes -= wr;
-	}
-	mutex_unlock(&sbi->pipe_mutex);
-
-	/* Keep the currently executing process from receiving a
-	 * SIGPIPE unless it was already supposed to get one
-	 */
-	if (wr == -EPIPE && !sigpipe) {
-		spin_lock_irqsave(&current->sighand->siglock, flags);
-		sigdelset(&current->pending.signal, SIGPIPE);
-		recalc_sigpending();
-		spin_unlock_irqrestore(&current->sighand->siglock, flags);
-	}
-
-	/* if 'wr' returned 0 (impossible) we assume -EIO (safe) */
-	return bytes == 0 ? 0 : wr < 0 ? wr : -EIO;
-}
-
-static void autofs_notify_daemon(struct autofs_sb_info *sbi,
-				 struct autofs_wait_queue *wq,
-				 int type)
-{
-	union {
-		struct autofs_packet_hdr hdr;
-		union autofs_packet_union v4_pkt;
-		union autofs_v5_packet_union v5_pkt;
-	} pkt;
-	struct file *pipe = NULL;
-	size_t pktsz;
-	int ret;
-
-	pr_debug("wait id = 0x%08lx, name = %.*s, type=%d\n",
-		 (unsigned long) wq->wait_queue_token,
-		 wq->name.len, wq->name.name, type);
-
-	memset(&pkt, 0, sizeof(pkt)); /* For security reasons */
-
-	pkt.hdr.proto_version = sbi->version;
-	pkt.hdr.type = type;
-
-	switch (type) {
-	/* Kernel protocol v4 missing and expire packets */
-	case autofs_ptype_missing:
-	{
-		struct autofs_packet_missing *mp = &pkt.v4_pkt.missing;
-
-		pktsz = sizeof(*mp);
-
-		mp->wait_queue_token = wq->wait_queue_token;
-		mp->len = wq->name.len;
-		memcpy(mp->name, wq->name.name, wq->name.len);
-		mp->name[wq->name.len] = '\0';
-		break;
-	}
-	case autofs_ptype_expire_multi:
-	{
-		struct autofs_packet_expire_multi *ep =
-					&pkt.v4_pkt.expire_multi;
-
-		pktsz = sizeof(*ep);
-
-		ep->wait_queue_token = wq->wait_queue_token;
-		ep->len = wq->name.len;
-		memcpy(ep->name, wq->name.name, wq->name.len);
-		ep->name[wq->name.len] = '\0';
-		break;
-	}
-	/*
-	 * Kernel protocol v5 packet for handling indirect and direct
-	 * mount missing and expire requests
-	 */
-	case autofs_ptype_missing_indirect:
-	case autofs_ptype_expire_indirect:
-	case autofs_ptype_missing_direct:
-	case autofs_ptype_expire_direct:
-	{
-		struct autofs_v5_packet *packet = &pkt.v5_pkt.v5_packet;
-		struct user_namespace *user_ns = sbi->pipe->f_cred->user_ns;
-
-		pktsz = sizeof(*packet);
-
-		packet->wait_queue_token = wq->wait_queue_token;
-		packet->len = wq->name.len;
-		memcpy(packet->name, wq->name.name, wq->name.len);
-		packet->name[wq->name.len] = '\0';
-		packet->dev = wq->dev;
-		packet->ino = wq->ino;
-		packet->uid = from_kuid_munged(user_ns, wq->uid);
-		packet->gid = from_kgid_munged(user_ns, wq->gid);
-		packet->pid = wq->pid;
-		packet->tgid = wq->tgid;
-		break;
-	}
-	default:
-		pr_warn("bad type %d!\n", type);
-		mutex_unlock(&sbi->wq_mutex);
-		return;
-	}
-
-	pipe = get_file(sbi->pipe);
-
-	mutex_unlock(&sbi->wq_mutex);
-
-	switch (ret = autofs_write(sbi, pipe, &pkt, pktsz)) {
-	case 0:
-		break;
-	case -ENOMEM:
-	case -ERESTARTSYS:
-		/* Just fail this one */
-		autofs_wait_release(sbi, wq->wait_queue_token, ret);
-		break;
-	default:
-		autofs_catatonic_mode(sbi);
-		break;
-	}
-	fput(pipe);
-}
-
-static int autofs_getpath(struct autofs_sb_info *sbi,
-			  struct dentry *dentry, char **name)
-{
-	struct dentry *root = sbi->sb->s_root;
-	struct dentry *tmp;
-	char *buf;
-	char *p;
-	int len;
-	unsigned seq;
-
-rename_retry:
-	buf = *name;
-	len = 0;
-
-	seq = read_seqbegin(&rename_lock);
-	rcu_read_lock();
-	spin_lock(&sbi->fs_lock);
-	for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent)
-		len += tmp->d_name.len + 1;
-
-	if (!len || --len > NAME_MAX) {
-		spin_unlock(&sbi->fs_lock);
-		rcu_read_unlock();
-		if (read_seqretry(&rename_lock, seq))
-			goto rename_retry;
-		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(&sbi->fs_lock);
-	rcu_read_unlock();
-	if (read_seqretry(&rename_lock, seq))
-		goto rename_retry;
-
-	return len;
-}
-
-static struct autofs_wait_queue *
-autofs_find_wait(struct autofs_sb_info *sbi, const struct qstr *qstr)
-{
-	struct autofs_wait_queue *wq;
-
-	for (wq = sbi->queues; wq; wq = wq->next) {
-		if (wq->name.hash == qstr->hash &&
-		    wq->name.len == qstr->len &&
-		    wq->name.name &&
-		    !memcmp(wq->name.name, qstr->name, qstr->len))
-			break;
-	}
-	return wq;
-}
-
-/*
- * Check if we have a valid request.
- * Returns
- * 1 if the request should continue.
- *   In this case we can return an autofs_wait_queue entry if one is
- *   found or NULL to idicate a new wait needs to be created.
- * 0 or a negative errno if the request shouldn't continue.
- */
-static int validate_request(struct autofs_wait_queue **wait,
-			    struct autofs_sb_info *sbi,
-			    const struct qstr *qstr,
-			    const struct path *path, enum autofs_notify notify)
-{
-	struct dentry *dentry = path->dentry;
-	struct autofs_wait_queue *wq;
-	struct autofs_info *ino;
-
-	if (sbi->catatonic)
-		return -ENOENT;
-
-	/* Wait in progress, continue; */
-	wq = autofs_find_wait(sbi, qstr);
-	if (wq) {
-		*wait = wq;
-		return 1;
-	}
-
-	*wait = NULL;
-
-	/* If we don't yet have any info this is a new request */
-	ino = autofs_dentry_ino(dentry);
-	if (!ino)
-		return 1;
-
-	/*
-	 * If we've been asked to wait on an existing expire (NFY_NONE)
-	 * but there is no wait in the queue ...
-	 */
-	if (notify == NFY_NONE) {
-		/*
-		 * Either we've betean the pending expire to post it's
-		 * wait or it finished while we waited on the mutex.
-		 * So we need to wait till either, the wait appears
-		 * or the expire finishes.
-		 */
-
-		while (ino->flags & AUTOFS_INF_EXPIRING) {
-			mutex_unlock(&sbi->wq_mutex);
-			schedule_timeout_interruptible(HZ/10);
-			if (mutex_lock_interruptible(&sbi->wq_mutex))
-				return -EINTR;
-
-			if (sbi->catatonic)
-				return -ENOENT;
-
-			wq = autofs_find_wait(sbi, qstr);
-			if (wq) {
-				*wait = wq;
-				return 1;
-			}
-		}
-
-		/*
-		 * Not ideal but the status has already gone. Of the two
-		 * cases where we wait on NFY_NONE neither depend on the
-		 * return status of the wait.
-		 */
-		return 0;
-	}
-
-	/*
-	 * If we've been asked to trigger a mount and the request
-	 * completed while we waited on the mutex ...
-	 */
-	if (notify == NFY_MOUNT) {
-		struct dentry *new = NULL;
-		struct path this;
-		int valid = 1;
-
-		/*
-		 * If the dentry was successfully mounted while we slept
-		 * on the wait queue mutex we can return success. If it
-		 * isn't mounted (doesn't have submounts for the case of
-		 * a multi-mount with no mount at it's base) we can
-		 * continue on and create a new request.
-		 */
-		if (!IS_ROOT(dentry)) {
-			if (d_unhashed(dentry) &&
-			    d_really_is_positive(dentry)) {
-				struct dentry *parent = dentry->d_parent;
-
-				new = d_lookup(parent, &dentry->d_name);
-				if (new)
-					dentry = new;
-			}
-		}
-		this.mnt = path->mnt;
-		this.dentry = dentry;
-		if (path_has_submounts(&this))
-			valid = 0;
-
-		if (new)
-			dput(new);
-		return valid;
-	}
-
-	return 1;
-}
-
-int autofs_wait(struct autofs_sb_info *sbi,
-		 const struct path *path, enum autofs_notify notify)
-{
-	struct dentry *dentry = path->dentry;
-	struct autofs_wait_queue *wq;
-	struct qstr qstr;
-	char *name;
-	int status, ret, type;
-	pid_t pid;
-	pid_t tgid;
-
-	/* In catatonic mode, we don't wait for nobody */
-	if (sbi->catatonic)
-		return -ENOENT;
-
-	/*
-	 * Try translating pids to the namespace of the daemon.
-	 *
-	 * Zero means failure: we are in an unrelated pid namespace.
-	 */
-	pid = task_pid_nr_ns(current, ns_of_pid(sbi->oz_pgrp));
-	tgid = task_tgid_nr_ns(current, ns_of_pid(sbi->oz_pgrp));
-	if (pid == 0 || tgid == 0)
-		return -ENOENT;
-
-	if (d_really_is_negative(dentry)) {
-		/*
-		 * A wait for a negative dentry is invalid for certain
-		 * cases. A direct or offset mount "always" has its mount
-		 * point directory created and so the request dentry must
-		 * be positive or the map key doesn't exist. The situation
-		 * is very similar for indirect mounts except only dentrys
-		 * in the root of the autofs file system may be negative.
-		 */
-		if (autofs_type_trigger(sbi->type))
-			return -ENOENT;
-		else if (!IS_ROOT(dentry->d_parent))
-			return -ENOENT;
-	}
-
-	name = kmalloc(NAME_MAX + 1, GFP_KERNEL);
-	if (!name)
-		return -ENOMEM;
-
-	/* If this is a direct mount request create a dummy name */
-	if (IS_ROOT(dentry) && autofs_type_trigger(sbi->type))
-		qstr.len = sprintf(name, "%p", dentry);
-	else {
-		qstr.len = autofs_getpath(sbi, dentry, &name);
-		if (!qstr.len) {
-			kfree(name);
-			return -ENOENT;
-		}
-	}
-	qstr.name = name;
-	qstr.hash = full_name_hash(dentry, name, qstr.len);
-
-	if (mutex_lock_interruptible(&sbi->wq_mutex)) {
-		kfree(qstr.name);
-		return -EINTR;
-	}
-
-	ret = validate_request(&wq, sbi, &qstr, path, notify);
-	if (ret <= 0) {
-		if (ret != -EINTR)
-			mutex_unlock(&sbi->wq_mutex);
-		kfree(qstr.name);
-		return ret;
-	}
-
-	if (!wq) {
-		/* Create a new wait queue */
-		wq = kmalloc(sizeof(struct autofs_wait_queue), GFP_KERNEL);
-		if (!wq) {
-			kfree(qstr.name);
-			mutex_unlock(&sbi->wq_mutex);
-			return -ENOMEM;
-		}
-
-		wq->wait_queue_token = autofs_next_wait_queue;
-		if (++autofs_next_wait_queue == 0)
-			autofs_next_wait_queue = 1;
-		wq->next = sbi->queues;
-		sbi->queues = wq;
-		init_waitqueue_head(&wq->queue);
-		memcpy(&wq->name, &qstr, sizeof(struct qstr));
-		wq->dev = autofs_get_dev(sbi);
-		wq->ino = autofs_get_ino(sbi);
-		wq->uid = current_uid();
-		wq->gid = current_gid();
-		wq->pid = pid;
-		wq->tgid = tgid;
-		wq->status = -EINTR; /* Status return if interrupted */
-		wq->wait_ctr = 2;
-
-		if (sbi->version < 5) {
-			if (notify == NFY_MOUNT)
-				type = autofs_ptype_missing;
-			else
-				type = autofs_ptype_expire_multi;
-		} else {
-			if (notify == NFY_MOUNT)
-				type = autofs_type_trigger(sbi->type) ?
-					autofs_ptype_missing_direct :
-					 autofs_ptype_missing_indirect;
-			else
-				type = autofs_type_trigger(sbi->type) ?
-					autofs_ptype_expire_direct :
-					autofs_ptype_expire_indirect;
-		}
-
-		pr_debug("new wait id = 0x%08lx, name = %.*s, nfy=%d\n",
-			 (unsigned long) wq->wait_queue_token, wq->name.len,
-			 wq->name.name, notify);
-
-		/*
-		 * autofs_notify_daemon() may block; it will unlock ->wq_mutex
-		 */
-		autofs_notify_daemon(sbi, wq, type);
-	} else {
-		wq->wait_ctr++;
-		pr_debug("existing wait id = 0x%08lx, name = %.*s, nfy=%d\n",
-			 (unsigned long) wq->wait_queue_token, wq->name.len,
-			 wq->name.name, notify);
-		mutex_unlock(&sbi->wq_mutex);
-		kfree(qstr.name);
-	}
-
-	/*
-	 * wq->name.name is NULL iff the lock is already released
-	 * or the mount has been made catatonic.
-	 */
-	wait_event_killable(wq->queue, wq->name.name == NULL);
-	status = wq->status;
-
-	/*
-	 * For direct and offset mounts we need to track the requester's
-	 * uid and gid in the dentry info struct. This is so it can be
-	 * supplied, on request, by the misc device ioctl interface.
-	 * This is needed during daemon resatart when reconnecting
-	 * to existing, active, autofs mounts. The uid and gid (and
-	 * related string values) may be used for macro substitution
-	 * in autofs mount maps.
-	 */
-	if (!status) {
-		struct autofs_info *ino;
-		struct dentry *de = NULL;
-
-		/* direct mount or browsable map */
-		ino = autofs_dentry_ino(dentry);
-		if (!ino) {
-			/* If not lookup actual dentry used */
-			de = d_lookup(dentry->d_parent, &dentry->d_name);
-			if (de)
-				ino = autofs_dentry_ino(de);
-		}
-
-		/* Set mount requester */
-		if (ino) {
-			spin_lock(&sbi->fs_lock);
-			ino->uid = wq->uid;
-			ino->gid = wq->gid;
-			spin_unlock(&sbi->fs_lock);
-		}
-
-		if (de)
-			dput(de);
-	}
-
-	/* Are we the last process to need status? */
-	mutex_lock(&sbi->wq_mutex);
-	if (!--wq->wait_ctr)
-		kfree(wq);
-	mutex_unlock(&sbi->wq_mutex);
-
-	return status;
-}
-
-
-int autofs_wait_release(struct autofs_sb_info *sbi,
-			autofs_wqt_t wait_queue_token, int status)
-{
-	struct autofs_wait_queue *wq, **wql;
-
-	mutex_lock(&sbi->wq_mutex);
-	for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) {
-		if (wq->wait_queue_token == wait_queue_token)
-			break;
-	}
-
-	if (!wq) {
-		mutex_unlock(&sbi->wq_mutex);
-		return -EINVAL;
-	}
-
-	*wql = wq->next;	/* Unlink from chain */
-	kfree(wq->name.name);
-	wq->name.name = NULL;	/* Do not wait on this queue */
-	wq->status = status;
-	wake_up(&wq->queue);
-	if (!--wq->wait_ctr)
-		kfree(wq);
-	mutex_unlock(&sbi->wq_mutex);
-
-	return 0;
-}