aboutsummaryrefslogtreecommitdiffstats
path: root/kernel/hrtimer.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/hrtimer.c')
-rw-r--r--kernel/hrtimer.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index ce669174f355..1decafbb6b1a 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1091,11 +1091,10 @@ EXPORT_SYMBOL_GPL(hrtimer_cancel);
1091 */ 1091 */
1092ktime_t hrtimer_get_remaining(const struct hrtimer *timer) 1092ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
1093{ 1093{
1094 struct hrtimer_clock_base *base;
1095 unsigned long flags; 1094 unsigned long flags;
1096 ktime_t rem; 1095 ktime_t rem;
1097 1096
1098 base = lock_hrtimer_base(timer, &flags); 1097 lock_hrtimer_base(timer, &flags);
1099 rem = hrtimer_expires_remaining(timer); 1098 rem = hrtimer_expires_remaining(timer);
1100 unlock_hrtimer_base(timer, &flags); 1099 unlock_hrtimer_base(timer, &flags);
1101 1100
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-26 14:16:20 -0400
='#n240'>240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 
/* -*- c -*- --------------------------------------------------------------- *
 *
 * linux/fs/autofs/expire.c
 *
 *  Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
 *  Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
 *  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
 * option, any later version, incorporated herein by reference.
 *
 * ------------------------------------------------------------------------- */

#include "autofs_i.h"

static unsigned long now;

/* Check if a dentry can be expired return 1 if it can else return 0 */
static inline int autofs4_can_expire(struct dentry *dentry,
					unsigned long timeout, int do_now)
{
	struct autofs_info *ino = autofs4_dentry_ino(dentry);

	/* dentry in the process of being deleted */
	if (ino == NULL)
		return 0;

	/* No point expiring a pending mount */
	if (dentry->d_flags & DCACHE_AUTOFS_PENDING)
		return 0;

	if (!do_now) {
		/* Too young to die */
		if (time_after(ino->last_used + timeout, now))
			return 0;

		/* update last_used here :-
		   - obviously makes sense if it is in use now
		   - less obviously, prevents rapid-fire expire
		     attempts if expire fails the first time */
		ino->last_used = now;
	}

	return 1;
}

/* Check a mount point for busyness return 1 if not busy, otherwise */
static int autofs4_check_mount(struct vfsmount *mnt, struct dentry *dentry)
{
	int status = 0;

	DPRINTK("dentry %p %.*s",
		dentry, (int)dentry->d_name.len, dentry->d_name.name);

	mntget(mnt);
	dget(dentry);

	if (!autofs4_follow_mount(&mnt, &dentry))
		goto done;

	/* This is an autofs submount, we can't expire it */
	if (is_autofs4_dentry(dentry))
		goto done;

	/* The big question */
	if (may_umount_tree(mnt) == 0)
		status = 1;
done:
	DPRINTK("returning = %d", status);
	mntput(mnt);
	dput(dentry);
	return status;
}

/* Check a directory tree of mount points for busyness
 * The tree is not busy iff no mountpoints are busy
 * Return 1 if the tree is busy or 0 otherwise
 */
static int autofs4_check_tree(struct vfsmount *mnt,
	       		      struct dentry *top,
			      unsigned long timeout,
			      int do_now)
{
	struct dentry *this_parent = top;
	struct list_head *next;

	DPRINTK("parent %p %.*s",
		top, (int)top->d_name.len, top->d_name.name);

	/* Negative dentry - give up */
	if (!simple_positive(top))
		return 0;

	/* Timeout of a tree mount is determined by its top dentry */
	if (!autofs4_can_expire(top, timeout, do_now))
		return 0;

	/* Is someone visiting anywhere in the tree ? */
	if (may_umount_tree(mnt))
		return 0;

	spin_lock(&dcache_lock);
repeat:
	next = this_parent->d_subdirs.next;
resume:
	while (next != &this_parent->d_subdirs) {
		struct dentry *dentry = list_entry(next, struct dentry, d_child);

		/* Negative dentry - give up */
		if (!simple_positive(dentry)) {
			next = next->next;
			continue;
		}

		DPRINTK("dentry %p %.*s",
			dentry, (int)dentry->d_name.len, dentry->d_name.name);

		if (!simple_empty_nolock(dentry)) {
			this_parent = dentry;
			goto repeat;
		}

		dentry = dget(dentry);
		spin_unlock(&dcache_lock);

		if (d_mountpoint(dentry)) {
			/* First busy => tree busy */
			if (!autofs4_check_mount(mnt, dentry)) {
				dput(dentry);
				return 0;
			}
		}

		dput(dentry);
		spin_lock(&dcache_lock);
		next = next->next;
	}

	if (this_parent != top) {
		next = this_parent->d_child.next;
		this_parent = this_parent->d_parent;
		goto resume;
	}
	spin_unlock(&dcache_lock);

	return 1;
}

static struct dentry *autofs4_check_leaves(struct vfsmount *mnt,
					   struct dentry *parent,
					   unsigned long timeout,
					   int do_now)
{
	struct dentry *this_parent = parent;
	struct list_head *next;

	DPRINTK("parent %p %.*s",
		parent, (int)parent->d_name.len, parent->d_name.name);

	spin_lock(&dcache_lock);
repeat:
	next = this_parent->d_subdirs.next;
resume:
	while (next != &this_parent->d_subdirs) {
		struct dentry *dentry = list_entry(next, struct dentry, d_child);

		/* Negative dentry - give up */
		if (!simple_positive(dentry)) {
			next = next->next;
			continue;
		}

		DPRINTK("dentry %p %.*s",
			dentry, (int)dentry->d_name.len, dentry->d_name.name);

		if (!list_empty(&dentry->d_subdirs)) {
			this_parent = dentry;
			goto repeat;
		}

		dentry = dget(dentry);
		spin_unlock(&dcache_lock);

		if (d_mountpoint(dentry)) {
			/* Can we expire this guy */
			if (!autofs4_can_expire(dentry, timeout, do_now))
				goto cont;

			/* Can we umount this guy */
			if (autofs4_check_mount(mnt, dentry))
				return dentry;

		}
cont:
		dput(dentry);
		spin_lock(&dcache_lock);
		next = next->next;
	}

	if (this_parent != parent) {
		next = this_parent->d_child.next;
		this_parent = this_parent->d_parent;
		goto resume;
	}
	spin_unlock(&dcache_lock);

	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
 */
static struct dentry *autofs4_expire(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 *expired = NULL;
	struct list_head *next;
	int do_now = how & AUTOFS_EXP_IMMEDIATE;
	int exp_leaves = how & AUTOFS_EXP_LEAVES;

	if ( !sbi->exp_timeout || !root )
		return NULL;

	now = jiffies;
	timeout = sbi->exp_timeout;

	spin_lock(&dcache_lock);
	next = root->d_subdirs.next;

	/* On exit from the loop expire is set to a dgot dentry
	 * to expire or it's NULL */
	while ( next != &root->d_subdirs ) {
		struct dentry *dentry = list_entry(next, struct dentry, d_child);

		/* Negative dentry - give up */
		if ( !simple_positive(dentry) ) {
			next = next->next;
			continue;
		}

		dentry = dget(dentry);
		spin_unlock(&dcache_lock);

		/* Case 1: indirect mount or top level direct mount */
		if (d_mountpoint(dentry)) {
			DPRINTK("checking mountpoint %p %.*s",
				dentry, (int)dentry->d_name.len, dentry->d_name.name);

			/* Can we expire this guy */
			if (!autofs4_can_expire(dentry, timeout, do_now))
				goto next;

			/* Can we umount this guy */
			if (autofs4_check_mount(mnt, dentry)) {
				expired = dentry;
				break;
			}
			goto next;
		}

		if ( simple_empty(dentry) )
			goto next;

		/* Case 2: tree mount, expire iff entire tree is not busy */
		if (!exp_leaves) {
			/* Lock the tree as we must expire as a whole */
			spin_lock(&sbi->fs_lock);
			if (autofs4_check_tree(mnt, dentry, timeout, do_now)) {
				struct autofs_info *inf = autofs4_dentry_ino(dentry);

				/* Set this flag early to catch sys_chdir and the like */
				inf->flags |= AUTOFS_INF_EXPIRING;
				spin_unlock(&sbi->fs_lock);
				expired = dentry;
				break;
			}
			spin_unlock(&sbi->fs_lock);
		/* Case 3: direct mount, expire individual leaves */
		} else {
			expired = autofs4_check_leaves(mnt, dentry, timeout, do_now);