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, 632 deletions

diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
deleted file mode 100644
index 36f16b67a3bf..000000000000
--- a/fs/autofs4/expire.c
+++ /dev/null
@@ -1,632 +0,0 @@
-/*
- * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
- * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
- * 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 "autofs_i.h"
-
-static unsigned long now;
-
-/* Check if a dentry can be expired */
-static inline int autofs_can_expire(struct dentry *dentry,
-				    unsigned long timeout, int do_now)
-{
-	struct autofs_info *ino = autofs_dentry_ino(dentry);
-
-	/* dentry in the process of being deleted */
-	if (ino == NULL)
-		return 0;
-
-	if (!do_now) {
-		/* Too young to die */
-		if (!timeout || time_after(ino->last_used + timeout, now))
-			return 0;
-	}
-	return 1;
-}
-
-/* Check a mount point for busyness */
-static int autofs_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
-{
-	struct dentry *top = dentry;
-	struct path path = {.mnt = mnt, .dentry = dentry};
-	int status = 1;
-
-	pr_debug("dentry %p %pd\n", dentry, dentry);
-
-	path_get(&path);
-
-	if (!follow_down_one(&path))
-		goto done;
-
-	if (is_autofs_dentry(path.dentry)) {
-		struct autofs_sb_info *sbi = autofs_sbi(path.dentry->d_sb);
-
-		/* This is an autofs submount, we can't expire it */
-		if (autofs_type_indirect(sbi->type))
-			goto done;
-	}
-
-	/* Update the expiry counter if fs is busy */
-	if (!may_umount_tree(path.mnt)) {
-		struct autofs_info *ino;
-
-		ino = autofs_dentry_ino(top);
-		ino->last_used = jiffies;
-		goto done;
-	}
-
-	status = 0;
-done:
-	pr_debug("returning = %d\n", status);
-	path_put(&path);
-	return status;
-}
-
-/*
- * Calculate and dget next entry in the subdirs list under root.
- */
-static struct dentry *get_next_positive_subdir(struct dentry *prev,
-					       struct dentry *root)
-{
-	struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
-	struct list_head *next;
-	struct dentry *q;
-
-	spin_lock(&sbi->lookup_lock);
-	spin_lock(&root->d_lock);
-
-	if (prev)
-		next = prev->d_child.next;
-	else {
-		prev = dget_dlock(root);
-		next = prev->d_subdirs.next;
-	}
-
-cont:
-	if (next == &root->d_subdirs) {
-		spin_unlock(&root->d_lock);
-		spin_unlock(&sbi->lookup_lock);
-		dput(prev);
-		return NULL;
-	}
-
-	q = list_entry(next, struct dentry, d_child);
-
-	spin_lock_nested(&q->d_lock, DENTRY_D_LOCK_NESTED);
-	/* Already gone or negative dentry (under construction) - try next */
-	if (!d_count(q) || !simple_positive(q)) {
-		spin_unlock(&q->d_lock);
-		next = q->d_child.next;
-		goto cont;
-	}
-	dget_dlock(q);
-	spin_unlock(&q->d_lock);
-	spin_unlock(&root->d_lock);
-	spin_unlock(&sbi->lookup_lock);
-
-	dput(prev);
-
-	return q;
-}
-
-/*
- * Calculate and dget next entry in top down tree traversal.
- */
-static struct dentry *get_next_positive_dentry(struct dentry *prev,
-					       struct dentry *root)
-{
-	struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
-	struct list_head *next;
-	struct dentry *p, *ret;
-
-	if (prev == NULL)
-		return dget(root);
-
-	spin_lock(&sbi->lookup_lock);
-relock:
-	p = prev;
-	spin_lock(&p->d_lock);
-again:
-	next = p->d_subdirs.next;
-	if (next == &p->d_subdirs) {
-		while (1) {
-			struct dentry *parent;
-
-			if (p == root) {
-				spin_unlock(&p->d_lock);
-				spin_unlock(&sbi->lookup_lock);
-				dput(prev);
-				return NULL;
-			}
-
-			parent = p->d_parent;
-			if (!spin_trylock(&parent->d_lock)) {
-				spin_unlock(&p->d_lock);
-				cpu_relax();
-				goto relock;
-			}
-			spin_unlock(&p->d_lock);
-			next = p->d_child.next;
-			p = parent;
-			if (next != &parent->d_subdirs)
-				break;
-		}
-	}
-	ret = list_entry(next, struct dentry, d_child);
-
-	spin_lock_nested(&ret->d_lock, DENTRY_D_LOCK_NESTED);
-	/* Negative dentry - try next */
-	if (!simple_positive(ret)) {
-		spin_unlock(&p->d_lock);
-		lock_set_subclass(&ret->d_lock.dep_map, 0, _RET_IP_);
-		p = ret;
-		goto again;
-	}
-	dget_dlock(ret);
-	spin_unlock(&ret->d_lock);
-	spin_unlock(&p->d_lock);
-	spin_unlock(&sbi->lookup_lock);
-
-	dput(prev);
-
-	return ret;
-}
-
-/*
- * Check a direct mount point for busyness.
- * Direct mounts have similar expiry semantics to tree mounts.
- * The tree is not busy iff no mountpoints are busy and there are no
- * autofs submounts.
- */
-static int autofs_direct_busy(struct vfsmount *mnt,
-			      struct dentry *top,
-			      unsigned long timeout,
-			      int do_now)
-{
-	pr_debug("top %p %pd\n", top, top);
-
-	/* If it's busy update the expiry counters */
-	if (!may_umount_tree(mnt)) {
-		struct autofs_info *ino;
-
-		ino = autofs_dentry_ino(top);
-		if (ino)
-			ino->last_used = jiffies;
-		return 1;
-	}
-
-	/* Timeout of a direct mount is determined by its top dentry */
-	if (!autofs_can_expire(top, timeout, do_now))
-		return 1;
-
-	return 0;
-}
-
-/*
- * Check a directory tree of mount points for busyness
- * The tree is not busy iff no mountpoints are busy
- */
-static int autofs_tree_busy(struct vfsmount *mnt,
-			    struct dentry *top,
-			    unsigned long timeout,
-			    int do_now)
-{
-	struct autofs_info *top_ino = autofs_dentry_ino(top);
-	struct dentry *p;
-
-	pr_debug("top %p %pd\n", top, top);
-
-	/* Negative dentry - give up */
-	if (!simple_positive(top))
-		return 1;
-
-	p = NULL;
-	while ((p = get_next_positive_dentry(p, top))) {
-		pr_debug("dentry %p %pd\n", p, p);
-
-		/*
-		 * Is someone visiting anywhere in the subtree ?
-		 * If there's no mount we need to check the usage
-		 * count for the autofs dentry.
-		 * If the fs is busy update the expiry counter.
-		 */
-		if (d_mountpoint(p)) {
-			if (autofs_mount_busy(mnt, p)) {
-				top_ino->last_used = jiffies;
-				dput(p);
-				return 1;
-			}
-		} else {
-			struct autofs_info *ino = autofs_dentry_ino(p);
-			unsigned int ino_count = atomic_read(&ino->count);
-
-			/* allow for dget above and top is already dgot */
-			if (p == top)
-				ino_count += 2;
-			else
-				ino_count++;
-
-			if (d_count(p) > ino_count) {
-				top_ino->last_used = jiffies;
-				dput(p);
-				return 1;
-			}
-		}
-	}
-
-	/* Timeout of a tree mount is ultimately determined by its top dentry */
-	if (!autofs_can_expire(top, timeout, do_now))
-		return 1;
-
-	return 0;
-}
-
-static struct dentry *autofs_check_leaves(struct vfsmount *mnt,
-					  struct dentry *parent,
-					  unsigned long timeout,
-					  int do_now)
-{
-	struct dentry *p;
-
-	pr_debug("parent %p %pd\n", parent, parent);
-
-	p = NULL;
-	while ((p = get_next_positive_dentry(p, parent))) {
-		pr_debug("dentry %p %pd\n", p, p);
-
-		if (d_mountpoint(p)) {
-			/* Can we umount this guy */
-			if (autofs_mount_busy(mnt, p))
-				continue;
-
-			/* Can we expire this guy */
-			if (autofs_can_expire(p, timeout, do_now))
-				return p;
-		}
-	}
-	return NULL;
-}
-
-/* Check if we can expire a direct mount (possibly a tree) */
-struct dentry *autofs_expire_direct(struct super_block *sb,
-				    struct vfsmount *mnt,
-				    struct autofs_sb_info *sbi,
-				    int how)
-{
-	unsigned long timeout;
-	struct dentry *root = dget(sb->s_root);
-	int do_now = how & AUTOFS_EXP_IMMEDIATE;
-	struct autofs_info *ino;
-
-	if (!root)
-		return NULL;
-
-	now = jiffies;
-	timeout = sbi->exp_timeout;
-
-	if (!autofs_direct_busy(mnt, root, timeout, do_now)) {
-		spin_lock(&sbi->fs_lock);
-		ino = autofs_dentry_ino(root);
-		/* No point expiring a pending mount */
-		if (ino->flags & AUTOFS_INF_PENDING) {
-			spin_unlock(&sbi->fs_lock);
-			goto out;
-		}
-		ino->flags |= AUTOFS_INF_WANT_EXPIRE;
-		spin_unlock(&sbi->fs_lock);
-		synchronize_rcu();
-		if (!autofs_direct_busy(mnt, root, timeout, do_now)) {
-			spin_lock(&sbi->fs_lock);
-			ino->flags |= AUTOFS_INF_EXPIRING;
-			init_completion(&ino->expire_complete);
-			spin_unlock(&sbi->fs_lock);
-			return root;
-		}
-		spin_lock(&sbi->fs_lock);
-		ino->flags &= ~AUTOFS_INF_WANT_EXPIRE;
-		spin_unlock(&sbi->fs_lock);
-	}
-out:
-	dput(root);
-
-	return NULL;
-}
-
-/* Check if 'dentry' should expire, or return a nearby
- * dentry that is suitable.
- * If returned dentry is different from arg dentry,
- * then a dget() reference was taken, else not.
- */
-static struct dentry *should_expire(struct dentry *dentry,
-				    struct vfsmount *mnt,
-				    unsigned long timeout,
-				    int how)
-{
-	int do_now = how & AUTOFS_EXP_IMMEDIATE;
-	int exp_leaves = how & AUTOFS_EXP_LEAVES;
-	struct autofs_info *ino = autofs_dentry_ino(dentry);
-	unsigned int ino_count;
-
-	/* No point expiring a pending mount */
-	if (ino->flags & AUTOFS_INF_PENDING)
-		return NULL;
-
-	/*
-	 * Case 1: (i) indirect mount or top level pseudo direct mount
-	 *	   (autofs-4.1).
-	 *	   (ii) indirect mount with offset mount, check the "/"
-	 *	   offset (autofs-5.0+).
-	 */
-	if (d_mountpoint(dentry)) {
-		pr_debug("checking mountpoint %p %pd\n", dentry, dentry);
-
-		/* Can we umount this guy */
-		if (autofs_mount_busy(mnt, dentry))
-			return NULL;
-
-		/* Can we expire this guy */
-		if (autofs_can_expire(dentry, timeout, do_now))
-			return dentry;
-		return NULL;
-	}
-
-	if (d_really_is_positive(dentry) && d_is_symlink(dentry)) {
-		pr_debug("checking symlink %p %pd\n", dentry, dentry);
-		/*
-		 * A symlink can't be "busy" in the usual sense so
-		 * just check last used for expire timeout.
-		 */
-		if (autofs_can_expire(dentry, timeout, do_now))
-			return dentry;
-		return NULL;
-	}
-
-	if (simple_empty(dentry))
-		return NULL;
-
-	/* Case 2: tree mount, expire iff entire tree is not busy */
-	if (!exp_leaves) {
-		/* Path walk currently on this dentry? */
-		ino_count = atomic_read(&ino->count) + 1;
-		if (d_count(dentry) > ino_count)
-			return NULL;
-
-		if (!autofs_tree_busy(mnt, dentry, timeout, do_now))
-			return dentry;
-	/*
-	 * Case 3: pseudo direct mount, expire individual leaves
-	 *	   (autofs-4.1).
-	 */
-	} else {
-		/* Path walk currently on this dentry? */
-		struct dentry *expired;
-
-		ino_count = atomic_read(&ino->count) + 1;
-		if (d_count(dentry) > ino_count)
-			return NULL;
-
-		expired = autofs_check_leaves(mnt, dentry, timeout, do_now);
-		if (expired) {
-			if (expired == dentry)
-				dput(dentry);
-			return expired;
-		}
-	}
-	return NULL;
-}
-
-/*
- * Find an eligible tree to time-out
- * A tree is eligible if :-
- *  - it is unused by any user process
- *  - it has been unused for exp_timeout time
- */
-struct dentry *autofs_expire_indirect(struct super_block *sb,
-				      struct vfsmount *mnt,
-				      struct autofs_sb_info *sbi,
-				      int how)
-{
-	unsigned long timeout;
-	struct dentry *root = sb->s_root;
-	struct dentry *dentry;
-	struct dentry *expired;
-	struct dentry *found;
-	struct autofs_info *ino;
-
-	if (!root)
-		return NULL;
-
-	now = jiffies;
-	timeout = sbi->exp_timeout;
-
-	dentry = NULL;
-	while ((dentry = get_next_positive_subdir(dentry, root))) {
-		int flags = how;
-
-		spin_lock(&sbi->fs_lock);
-		ino = autofs_dentry_ino(dentry);
-		if (ino->flags & AUTOFS_INF_WANT_EXPIRE) {
-			spin_unlock(&sbi->fs_lock);
-			continue;
-		}
-		spin_unlock(&sbi->fs_lock);
-
-		expired = should_expire(dentry, mnt, timeout, flags);
-		if (!expired)
-			continue;
-
-		spin_lock(&sbi->fs_lock);
-		ino = autofs_dentry_ino(expired);
-		ino->flags |= AUTOFS_INF_WANT_EXPIRE;
-		spin_unlock(&sbi->fs_lock);
-		synchronize_rcu();
-
-		/* Make sure a reference is not taken on found if
-		 * things have changed.
-		 */
-		flags &= ~AUTOFS_EXP_LEAVES;
-		found = should_expire(expired, mnt, timeout, how);
-		if (!found || found != expired)
-			/* Something has changed, continue */
-			goto next;
-
-		if (expired != dentry)
-			dput(dentry);
-
-		spin_lock(&sbi->fs_lock);
-		goto found;
-next:
-		spin_lock(&sbi->fs_lock);
-		ino->flags &= ~AUTOFS_INF_WANT_EXPIRE;
-		spin_unlock(&sbi->fs_lock);
-		if (expired != dentry)
-			dput(expired);
-	}
-	return NULL;
-
-found:
-	pr_debug("returning %p %pd\n", expired, expired);
-	ino->flags |= AUTOFS_INF_EXPIRING;
-	init_completion(&ino->expire_complete);
-	spin_unlock(&sbi->fs_lock);
-	return expired;
-}
-
-int autofs_expire_wait(const struct path *path, int rcu_walk)
-{
-	struct dentry *dentry = path->dentry;
-	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
-	struct autofs_info *ino = autofs_dentry_ino(dentry);
-	int status;
-	int state;
-
-	/* Block on any pending expire */
-	if (!(ino->flags & AUTOFS_INF_WANT_EXPIRE))
-		return 0;
-	if (rcu_walk)
-		return -ECHILD;
-
-retry:
-	spin_lock(&sbi->fs_lock);
-	state = ino->flags & (AUTOFS_INF_WANT_EXPIRE | AUTOFS_INF_EXPIRING);
-	if (state == AUTOFS_INF_WANT_EXPIRE) {
-		spin_unlock(&sbi->fs_lock);
-		/*
-		 * Possibly being selected for expire, wait until
-		 * it's selected or not.
-		 */
-		schedule_timeout_uninterruptible(HZ/10);
-		goto retry;
-	}
-	if (state & AUTOFS_INF_EXPIRING) {
-		spin_unlock(&sbi->fs_lock);
-
-		pr_debug("waiting for expire %p name=%pd\n", dentry, dentry);
-
-		status = autofs_wait(sbi, path, NFY_NONE);
-		wait_for_completion(&ino->expire_complete);
-
-		pr_debug("expire done status=%d\n", status);
-
-		if (d_unhashed(dentry))
-			return -EAGAIN;
-
-		return status;
-	}
-	spin_unlock(&sbi->fs_lock);
-
-	return 0;
-}
-
-/* Perform an expiry operation */
-int autofs_expire_run(struct super_block *sb,
-		      struct vfsmount *mnt,
-		      struct autofs_sb_info *sbi,
-		      struct autofs_packet_expire __user *pkt_p)
-{
-	struct autofs_packet_expire pkt;
-	struct autofs_info *ino;
-	struct dentry *dentry;
-	int ret = 0;
-
-	memset(&pkt, 0, sizeof(pkt));
-
-	pkt.hdr.proto_version = sbi->version;
-	pkt.hdr.type = autofs_ptype_expire;
-
-	dentry = autofs_expire_indirect(sb, mnt, sbi, 0);
-	if (!dentry)
-		return -EAGAIN;
-
-	pkt.len = dentry->d_name.len;
-	memcpy(pkt.name, dentry->d_name.name, pkt.len);
-	pkt.name[pkt.len] = '\0';
-	dput(dentry);
-
-	if (copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)))
-		ret = -EFAULT;
-
-	spin_lock(&sbi->fs_lock);
-	ino = autofs_dentry_ino(dentry);
-	/* avoid rapid-fire expire attempts if expiry fails */
-	ino->last_used = now;
-	ino->flags &= ~(AUTOFS_INF_EXPIRING|AUTOFS_INF_WANT_EXPIRE);
-	complete_all(&ino->expire_complete);
-	spin_unlock(&sbi->fs_lock);
-
-	return ret;
-}
-
-int autofs_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
-			   struct autofs_sb_info *sbi, int when)
-{
-	struct dentry *dentry;
-	int ret = -EAGAIN;
-
-	if (autofs_type_trigger(sbi->type))
-		dentry = autofs_expire_direct(sb, mnt, sbi, when);
-	else
-		dentry = autofs_expire_indirect(sb, mnt, sbi, when);
-
-	if (dentry) {
-		struct autofs_info *ino = autofs_dentry_ino(dentry);
-		const struct path path = { .mnt = mnt, .dentry = dentry };
-
-		/* This is synchronous because it makes the daemon a
-		 * little easier
-		 */
-		ret = autofs_wait(sbi, &path, NFY_EXPIRE);
-
-		spin_lock(&sbi->fs_lock);
-		/* avoid rapid-fire expire attempts if expiry fails */
-		ino->last_used = now;
-		ino->flags &= ~(AUTOFS_INF_EXPIRING|AUTOFS_INF_WANT_EXPIRE);
-		complete_all(&ino->expire_complete);
-		spin_unlock(&sbi->fs_lock);
-		dput(dentry);
-	}
-
-	return ret;
-}
-
-/*
- * Call repeatedly until it returns -EAGAIN, meaning there's nothing
- * more to be done.
- */
-int autofs_expire_multi(struct super_block *sb, struct vfsmount *mnt,
-			struct autofs_sb_info *sbi, int __user *arg)
-{
-	int do_now = 0;
-
-	if (arg && get_user(do_now, arg))
-		return -EFAULT;
-
-	return autofs_do_expire_multi(sb, mnt, sbi, do_now);
-}
-