#include <linux/fanotify.h>
#include <linux/fdtable.h>
#include <linux/fsnotify_backend.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/kernel.h> /* UINT_MAX */
#include <linux/mount.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/wait.h>

#include "fanotify.h"

static bool should_merge(struct fsnotify_event *old_fsn,
			 struct fsnotify_event *new_fsn)
{
	struct fanotify_event_info *old, *new;

	pr_debug("%s: old=%p new=%p\n", __func__, old_fsn, new_fsn);
	old = FANOTIFY_E(old_fsn);
	new = FANOTIFY_E(new_fsn);

	if (old_fsn->inode == new_fsn->inode && old->tgid == new->tgid &&
	    old->path.mnt == new->path.mnt &&
	    old->path.dentry == new->path.dentry)
		return true;
	return false;
}

/* and the list better be locked by something too! */
static int fanotify_merge(struct list_head *list, struct fsnotify_event *event)
{
	struct fsnotify_event *test_event;
	bool do_merge = false;

	pr_debug("%s: list=%p event=%p\n", __func__, list, event);

#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
	/*
	 * Don't merge a permission event with any other event so that we know
	 * the event structure we have created in fanotify_handle_event() is the
	 * one we should check for permission response.
	 */
	if (event->mask & FAN_ALL_PERM_EVENTS)
		return 0;
#endif

	list_for_each_entry_reverse(test_event, list, list) {
		if (should_merge(test_event, event)) {
			do_merge = true;
			break;
		}
	}

	if (!do_merge)
		return 0;

	test_event->mask |= event->mask;
	return 1;
}

#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
static int fanotify_get_response(struct fsnotify_group *group,
				 struct fanotify_perm_event_info *event)
{
	int ret;

	pr_debug("%s: group=%p event=%p\n", __func__, group, event);

	wait_event(group->fanotify_data.access_waitq, event->response);

	/* userspace responded, convert to something usable */
	switch (event->response) {
	case FAN_ALLOW:
		ret = 0;
		break;
	case FAN_DENY:
	default:
		ret = -EPERM;
	}
	event->response = 0;

	pr_debug("%s: group=%p event=%p about to return ret=%d\n", __func__,
		 group, event, ret);
	
	return ret;
}
#endif

static bool fanotify_should_send_event(struct fsnotify_mark *inode_mark,
				       struct fsnotify_mark *vfsmnt_mark,
				       u32 event_mask,
				       const void *data, int data_type)
{
	__u32 marks_mask, marks_ignored_mask;
	const struct path *path = data;

	pr_debug("%s: inode_mark=%p vfsmnt_mark=%p mask=%x data=%p"
		 " data_type=%d\n", __func__, inode_mark, vfsmnt_mark,
		 event_mask, data, data_type);

	/* if we don't have enough info to send an event to userspace say no */
	if (data_type != FSNOTIFY_EVENT_PATH)
		return false;

	/* sorry, fanotify only gives a damn about files and dirs */
	if (!d_is_reg(path->dentry) &&
	    !d_can_lookup(path->dentry))
		return false;

	if (inode_mark && vfsmnt_mark) {
		marks_mask = (vfsmnt_mark->mask | inode_mark->mask);
		marks_ignored_mask = (vfsmnt_mark->ignored_mask | inode_mark->ignored_mask);
	} else if (inode_mark) {
		/*
		 * if the event is for a child and this inode doesn't care about
		 * events on the child, don't send it!
		 */
		if ((event_mask & FS_EVENT_ON_CHILD) &&
		    !(inode_mark->mask & FS_EVENT_ON_CHILD))
			return false;
		marks_mask = inode_mark->mask;
		marks_ignored_mask = inode_mark->ignored_mask;
	} else if (vfsmnt_mark) {
		marks_mask = vfsmnt_mark->mask;
		marks_ignored_mask = vfsmnt_mark->ignored_mask;
	} else {
		BUG();
	}

	if (d_is_dir(path->dentry) &&
	    !(marks_mask & FS_ISDIR & ~marks_ignored_mask))
		return false;

	if (event_mask & FAN_ALL_OUTGOING_EVENTS & marks_mask &
				 ~marks_ignored_mask)
		return true;

	return false;
}

struct fanotify_event_info *fanotify_alloc_event(struct inode *inode, u32 mask,
						 const struct path *path)
{
	struct fanotify_event_info *event;

#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
	if (mask & FAN_ALL_PERM_EVENTS) {
		struct fanotify_perm_event_info *pevent;

		pevent = kmem_cache_alloc(fanotify_perm_event_cachep,
					  GFP_KERNEL);
		if (!pevent)
			return NULL;
		event = &pevent->fae;
		pevent->response = 0;
		goto init;
	}
#endif
	event = kmem_cache_alloc(fanotify_event_cachep, GFP_KERNEL);
	if (!event)
		return NULL;
init: __maybe_unused
	fsnotify_init_event(&event->fse, inode, mask);
	event->tgid = get_pid(task_tgid(current));
	if (path) {
		event->path = *path;
		path_get(&event->path);
	} else {
		event->path.mnt = NULL;
		event->path.dentry = NULL;
	}
	return event;
}

static int fanotify_handle_event(struct fsnotify_group *group,
				 struct inode *inode,
				 struct fsnotify_mark *inode_mark,
				 struct fsnotify_mark *fanotify_mark,
				 u32 mask, const void *data, int data_type,
				 const unsigned char *file_name, u32 cookie)
{
	int ret = 0;
	struct fanotify_event_info *event;
	struct fsnotify_event *fsn_event;

	BUILD_BUG_ON(FAN_ACCESS != FS_ACCESS);
	BUILD_BUG_ON(FAN_MODIFY != FS_MODIFY);
	BUILD_BUG_ON(FAN_CLOSE_NOWRITE != FS_CLOSE_NOWRITE);
	BUILD_BUG_ON(FAN_CLOSE_WRITE != FS_CLOSE_WRITE);
	BUILD_BUG_ON(FAN_OPEN != FS_OPEN);
	BUILD_BUG_ON(FAN_EVENT_ON_CHILD != FS_EVENT_ON_CHILD);
	BUILD_BUG_ON(FAN_Q_OVERFLOW != FS_Q_OVERFLOW);
	BUILD_BUG_ON(FAN_OPEN_PERM != FS_OPEN_PERM);
	BUILD_BUG_ON(FAN_ACCESS_PERM != FS_ACCESS_PERM);
	BUILD_BUG_ON(FAN_ONDIR != FS_ISDIR);

	if (!fanotify_should_send_event(inode_mark, fanotify_mark, mask, data,
					data_type))
		return 0;

	pr_debug("%s: group=%p inode=%p mask=%x\n", __func__, group, inode,
		 mask);

	event = fanotify_alloc_event(inode, mask, data);
	if (unlikely(!event))
		return -ENOMEM;

	fsn_event = &event->fse;
	ret = fsnotify_add_event(group, fsn_event, fanotify_merge);
	if (ret) {
		/* Permission events shouldn't be merged */
		BUG_ON(ret == 1 && mask & FAN_ALL_PERM_EVENTS);
		/* Our event wasn't used in the end. Free it. */
		fsnotify_destroy_event(group, fsn_event);

		return 0;
	}

#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
	if (mask & FAN_ALL_PERM_EVENTS) {
		ret = fanotify_get_response(group, FANOTIFY_PE(fsn_event));
		fsnotify_destroy_event(group, fsn_event);
	}
#endif
	return ret;
}

static void fanotify_free_group_priv(struct fsnotify_group *group)
{
	struct user_struct *user;

	user = group->fanotify_data.user;
	atomic_dec(&user->fanotify_listeners);
	free_uid(user);
}

static void fanotify_free_event(struct fsnotify_event *fsn_event)
{
	struct fanotify_event_info *event;

	event = FANOTIFY_E(fsn_event);
	path_put(&event->path);
	put_pid(event->tgid);
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
	if (fsn_event->mask & FAN_ALL_PERM_EVENTS) {
		kmem_cache_free(fanotify_perm_event_cachep,
				FANOTIFY_PE(fsn_event));
		return;
	}
#endif
	kmem_cache_free(fanotify_event_cachep, event);
}

const struct fsnotify_ops fanotify_fsnotify_ops = {
	.handle_event = fanotify_handle_event,
	.free_group_priv = fanotify_free_group_priv,
	.free_event = fanotify_free_event,
};
'commit-msg'>The regulator has never been properly enabled, it has been
dormant all the time. It's strange that MMC was working
at all, but it likely worked by the signals going through
the levelshifter and reaching the card anyways.

Fixes: 3615a34ea1a6 ("regulator: add STw481x VMMC driver")
Signed-off-by: Linus Walleij &lt;linus.walleij@linaro.org&gt;
Signed-off-by: Mark Brown &lt;broonie@kernel.org&gt;
Cc: stable@vger.kernel.org
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=295070e9aa015abb9b92cccfbb1e43954e938133'>Diffstat</a> (limited to 'tools/perf/bench/mem-memset-x86-64-asm.S')</div><table summary='diffstat' class='diffstat'>