Release 4.10 fs/notify/fanotify/fanotify_user.c

#include <linux/fanotify.h>
#include <linux/fcntl.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/anon_inodes.h>
#include <linux/fsnotify_backend.h>
#include <linux/init.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/poll.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/compat.h>

#include <asm/ioctls.h>

#include "../../mount.h"
#include "../fdinfo.h"
#include "fanotify.h"


#define FANOTIFY_DEFAULT_MAX_EVENTS	16384

#define FANOTIFY_DEFAULT_MAX_MARKS	8192

#define FANOTIFY_DEFAULT_MAX_LISTENERS	128

/*
 * All flags that may be specified in parameter event_f_flags of fanotify_init.
 *
 * Internal and external open flags are stored together in field f_flags of
 * struct file. Only external open flags shall be allowed in event_f_flags.
 * Internal flags like FMODE_NONOTIFY, FMODE_EXEC, FMODE_NOCMTIME shall be
 * excluded.
 */

#define	FANOTIFY_INIT_ALL_EVENT_F_BITS				( \
                O_ACCMODE       | O_APPEND      | O_NONBLOCK    | \
                __O_SYNC        | O_DSYNC       | O_CLOEXEC     | \
                O_LARGEFILE     | O_NOATIME     )

extern const struct fsnotify_ops fanotify_fsnotify_ops;


static struct kmem_cache *fanotify_mark_cache __read_mostly;

struct kmem_cache *fanotify_event_cachep __read_mostly;

struct kmem_cache *fanotify_perm_event_cachep __read_mostly;

/*
 * Get an fsnotify notification event if one exists and is small
 * enough to fit in "count". Return an error pointer if the count
 * is not large enough.
 *
 * Called with the group->notification_lock held.
 */


static struct fsnotify_event *get_one_event(struct fsnotify_group *group,
					    size_t count)
{
	assert_spin_locked(&group->notification_lock);

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

	if (fsnotify_notify_queue_is_empty(group))
		return NULL;

	if (FAN_EVENT_METADATA_LEN > count)
		return ERR_PTR(-EINVAL);

	/* held the notification_lock the whole time, so this is the
         * same event we peeked above */
	return fsnotify_remove_first_event(group);
}

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65
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4
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static int create_fd(struct fsnotify_group *group,
		     struct fanotify_event_info *event,
		     struct file **file)
{
	int client_fd;
	struct file *new_file;

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

	client_fd = get_unused_fd_flags(group->fanotify_data.f_flags);
	if (client_fd < 0)
		return client_fd;

	/*
         * we need a new file handle for the userspace program so it can read even if it was
         * originally opened O_WRONLY.
         */
	/* it's possible this event was an overflow event.  in that case dentry and mnt
         * are NULL;  That's fine, just don't call dentry open */
	if (event->path.dentry && event->path.mnt)
		new_file = dentry_open(&event->path,
				       group->fanotify_data.f_flags | FMODE_NONOTIFY,
				       current_cred());
	else
		new_file = ERR_PTR(-EOVERFLOW);
	if (IS_ERR(new_file)) {
		/*
                 * we still send an event even if we can't open the file.  this
                 * can happen when say tasks are gone and we try to open their
                 * /proc files or we try to open a WRONLY file like in sysfs
                 * we just send the errno to userspace since there isn't much
                 * else we can do.
                 */
		put_unused_fd(client_fd);
		client_fd = PTR_ERR(new_file);
	} else {
		*file = new_file;
	}

	return client_fd;
}

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eric paris
eric paris
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al viro
17
12.14%
2
25.00%
yann droneaud
yann droneaud
8
5.71%
1
12.50%
andreas gruenbacher
andreas gruenbacher
3
2.14%
1
12.50%
linus torvalds
linus torvalds
2
1.43%
1
12.50%
jan kara
jan kara
1
0.71%
1
12.50%
Total
140
100.00%
8
100.00%



static int fill_event_metadata(struct fsnotify_group *group,
			       struct fanotify_event_metadata *metadata,
			       struct fsnotify_event *fsn_event,
			       struct file **file)
{
	int ret = 0;
	struct fanotify_event_info *event;

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

	*file = NULL;
	event = container_of(fsn_event, struct fanotify_event_info, fse);
	metadata->event_len = FAN_EVENT_METADATA_LEN;
	metadata->metadata_len = FAN_EVENT_METADATA_LEN;
	metadata->vers = FANOTIFY_METADATA_VERSION;
	metadata->reserved = 0;
	metadata->mask = fsn_event->mask & FAN_ALL_OUTGOING_EVENTS;
	metadata->pid = pid_vnr(event->tgid);
	if (unlikely(fsn_event->mask & FAN_Q_OVERFLOW))
		metadata->fd = FAN_NOFD;
	else {
		metadata->fd = create_fd(group, event, file);
		if (metadata->fd < 0)
			ret = metadata->fd;
	}

	return ret;
}

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eric paris
eric paris
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4
36.36%
lino sanfilippo
lino sanfilippo
37
22.84%
1
9.09%
jan kara
jan kara
21
12.96%
1
9.09%
andreas gruenbacher
andreas gruenbacher
13
8.02%
3
27.27%
al viro
al viro
13
8.02%
1
9.09%
dan carpenter
dan carpenter
6
3.70%
1
9.09%
Total
162
100.00%
11
100.00%

#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS


static struct fanotify_perm_event_info *dequeue_event(
				struct fsnotify_group *group, int fd)
{
	struct fanotify_perm_event_info *event, *return_e = NULL;

	spin_lock(&group->notification_lock);
	list_for_each_entry(event, &group->fanotify_data.access_list,
			    fae.fse.list) {
		if (event->fd != fd)
			continue;

		list_del_init(&event->fae.fse.list);
		return_e = event;
		break;
	}
	spin_unlock(&group->notification_lock);

	pr_debug("%s: found return_re=%p\n", __func__, return_e);

	return return_e;
}

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eric paris
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jan kara
22
24.44%
3
75.00%
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90
100.00%
4
100.00%



static int process_access_response(struct fsnotify_group *group,
				   struct fanotify_response *response_struct)
{
	struct fanotify_perm_event_info *event;
	int fd = response_struct->fd;
	int response = response_struct->response;

	pr_debug("%s: group=%p fd=%d response=%d\n", __func__, group,
		 fd, response);
	/*
         * make sure the response is valid, if invalid we do nothing and either
         * userspace can send a valid response or we will clean it up after the
         * timeout
         */
	switch (response) {
	case FAN_ALLOW:
	case FAN_DENY:
		break;
	default:
		return -EINVAL;
	}

	if (fd < 0)
		return -EINVAL;

	event = dequeue_event(group, fd);
	if (!event)
		return -ENOENT;

	event->response = response;
	wake_up(&group->fanotify_data.access_waitq);

	return 0;
}
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eric paris
105
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1
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jan kara
jan kara
7
6.14%
1
25.00%
andreas gruenbacher
andreas gruenbacher
1
0.88%
1
25.00%
lucas de marchi
lucas de marchi
1
0.88%
1
25.00%
Total
114
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4
100.00%

#endif



static ssize_t copy_event_to_user(struct fsnotify_group *group,
				  struct fsnotify_event *event,
				  char __user *buf)
{
	struct fanotify_event_metadata fanotify_event_metadata;
	struct file *f;
	int fd, ret;

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

	ret = fill_event_metadata(group, &fanotify_event_metadata, event, &f);
	if (ret < 0)
		return ret;

	fd = fanotify_event_metadata.fd;
	ret = -EFAULT;
	if (copy_to_user(buf, &fanotify_event_metadata,
			 fanotify_event_metadata.event_len))
		goto out_close_fd;

#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
	if (event->mask & FAN_ALL_PERM_EVENTS)
		FANOTIFY_PE(event)->fd = fd;
#endif

	if (fd != FAN_NOFD)
		fd_install(fd, f);
	return fanotify_event_metadata.event_len;

out_close_fd:
	if (fd != FAN_NOFD) {
		put_unused_fd(fd);
		fput(f);
	}
	return ret;
}

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eric paris
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40.00%
al viro
al viro
35
21.74%
2
20.00%
jan kara
jan kara
22
13.66%
2
20.00%
lino sanfilippo
lino sanfilippo
9
5.59%
1
10.00%
andreas gruenbacher
andreas gruenbacher
2
1.24%
1
10.00%
Total
161
100.00%
10
100.00%

/* intofiy userspace file descriptor functions */


static unsigned int fanotify_poll(struct file *file, poll_table *wait)
{
	struct fsnotify_group *group = file->private_data;
	int ret = 0;

	poll_wait(file, &group->notification_waitq, wait);
	spin_lock(&group->notification_lock);
	if (!fsnotify_notify_queue_is_empty(group))
		ret = POLLIN | POLLRDNORM;
	spin_unlock(&group->notification_lock);

	return ret;
}

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eric paris
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jan kara
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5.33%
1
50.00%
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75
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2
100.00%



static ssize_t fanotify_read(struct file *file, char __user *buf,
			     size_t count, loff_t *pos)
{
	struct fsnotify_group *group;
	struct fsnotify_event *kevent;
	char __user *start;
	int ret;
	DEFINE_WAIT_FUNC(wait, woken_wake_function);

	start = buf;
	group = file->private_data;

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

	add_wait_queue(&group->notification_waitq, &wait);
	while (1) {
		spin_lock(&group->notification_lock);
		kevent = get_one_event(group, count);
		spin_unlock(&group->notification_lock);

		if (IS_ERR(kevent)) {
			ret = PTR_ERR(kevent);
			break;
		}

		if (!kevent) {
			ret = -EAGAIN;
			if (file->f_flags & O_NONBLOCK)
				break;

			ret = -ERESTARTSYS;
			if (signal_pending(current))
				break;

			if (start != buf)
				break;

			wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
			continue;
		}

		ret = copy_event_to_user(group, kevent, buf);
		/*
                 * Permission events get queued to wait for response.  Other
                 * events can be destroyed now.
                 */
		if (!(kevent->mask & FAN_ALL_PERM_EVENTS)) {
			fsnotify_destroy_event(group, kevent);
			if (ret < 0)
				break;
		} else {
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
			if (ret < 0) {
				FANOTIFY_PE(kevent)->response = FAN_DENY;
				wake_up(&group->fanotify_data.access_waitq);
				break;
			}
			spin_lock(&group->notification_lock);
			list_add_tail(&kevent->list,
				      &group->fanotify_data.access_list);
			spin_unlock(&group->notification_lock);
#endif
		}
		buf += ret;
		count -= ret;
	}
	remove_wait_queue(&group->notification_waitq, &wait);

	if (start != buf && ret != -EFAULT)
		ret = buf - start;
	return ret;
}

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eric paris
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jan kara
130
40.25%
6
75.00%
peter zijlstra
peter zijlstra
19
5.88%
1
12.50%
Total
323
100.00%
8
100.00%



static ssize_t fanotify_write(struct file *file, const char __user *buf, size_t count, loff_t *pos)
{
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
	struct fanotify_response response = { .fd = -1, .response = -1 };
	struct fsnotify_group *group;
	int ret;

	group = file->private_data;

	if (count > sizeof(response))
		count = sizeof(response);

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

	if (copy_from_user(&response, buf, count))
		return -EFAULT;

	ret = process_access_response(group, &response);
	if (ret < 0)
		count = ret;

	return count;
#else
	return -EINVAL;
#endif
}

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static int fanotify_release(struct inode *ignored, struct file *file)
{
	struct fsnotify_group *group = file->private_data;

#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
	struct fanotify_perm_event_info *event, *next;
	struct fsnotify_event *fsn_event;

	/*
         * Stop new events from arriving in the notification queue. since
         * userspace cannot use fanotify fd anymore, no event can enter or
         * leave access_list by now either.
         */
	fsnotify_group_stop_queueing(group);

	/*
         * Process all permission events on access_list and notification queue
         * and simulate reply from userspace.
         */
	spin_lock(&group->notification_lock);
	list_for_each_entry_safe(event, next, &group->fanotify_data.access_list,
				 fae.fse.list) {
		pr_debug("%s: found group=%p event=%p\n", __func__, group,
			 event);

		list_del_init(&event->fae.fse.list);
		event->response = FAN_ALLOW;
	}

	/*
         * Destroy all non-permission events. For permission events just
         * dequeue them and set the response. They will be freed once the
         * response is consumed and fanotify_get_response() returns.
         */
	while (!fsnotify_notify_queue_is_empty(group)) {
		fsn_event = fsnotify_remove_first_event(group);
		if (!(fsn_event->mask & FAN_ALL_PERM_EVENTS)) {
			spin_unlock(&group->notification_lock);
			fsnotify_destroy_event(group, fsn_event);
			spin_lock(&group->notification_lock);
		} else
			FANOTIFY_PE(fsn_event)->response = FAN_ALLOW;
	}
	spin_unlock(&group->notification_lock);

	/* Response for all permission events it set, wakeup waiters */
	wake_up(&group->fanotify_data.access_waitq);
#endif

	/* matches the fanotify_init->fsnotify_alloc_group */
	fsnotify_destroy_group(group);

	return 0;
}

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jan kara
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eric paris
89
46.60%
3
27.27%
lino sanfilippo
lino sanfilippo
4
2.09%
2
18.18%
andrew morton
andrew morton
3
1.57%
1
9.09%
Total
191
100.00%
11
100.00%



static long fanotify_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct fsnotify_group *group;
	struct fsnotify_event *fsn_event;
	void __user *p;
	int ret = -ENOTTY;
	size_t send_len = 0;

	group = file->private_data;

	p = (void __user *) arg;

	switch (cmd) {
	case FIONREAD:
		spin_lock(&group->notification_lock);
		list_for_each_entry(fsn_event, &group->notification_list, list)
			send_len += FAN_EVENT_METADATA_LEN;
		spin_unlock(&group->notification_lock);
		ret = put_user(send_len, (int __user *) p);
		break;
	}

	return ret;
}

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eric paris
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jan kara
8
6.96%
2
66.67%
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115
100.00%
3
100.00%


static const struct file_operations fanotify_fops = {
	.show_fdinfo	= fanotify_show_fdinfo,
	.poll		= fanotify_poll,
	.read		= fanotify_read,
	.write		= fanotify_write,
	.fasync		= NULL,
	.release	= fanotify_release,
	.unlocked_ioctl	= fanotify_ioctl,
	.compat_ioctl	= fanotify_ioctl,
	.llseek		= noop_llseek,
};



static void fanotify_free_mark(struct fsnotify_mark *fsn_mark)
{
	kmem_cache_free(fanotify_mark_cache, fsn_mark);
}

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18
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1
100.00%



static int fanotify_find_path(int dfd, const char __user *filename,
			      struct path *path, unsigned int flags)
{
	int ret;

	pr_debug("%s: dfd=%d filename=%p flags=%x\n", __func__,
		 dfd, filename, flags);

	if (filename == NULL) {
		struct fd f = fdget(dfd);

		ret = -EBADF;
		if (!f.file)
			goto out;

		ret = -ENOTDIR;
		if ((flags & FAN_MARK_ONLYDIR) &&
		    !(S_ISDIR(file_inode(f.file)->i_mode))) {
			fdput(f);
			goto out;
		}

		*path = f.file->f_path;
		path_get(path);
		fdput(f);
	} else {
		unsigned int lookup_flags = 0;

		if (!(flags & FAN_MARK_DONT_FOLLOW))
			lookup_flags |= LOOKUP_FOLLOW;
		if (flags & FAN_MARK_ONLYDIR)
			lookup_flags |= LOOKUP_DIRECTORY;

		ret = user_path_at(dfd, filename, lookup_flags, path);
		if (ret)
			goto out;
	}

	/* you can only watch an inode if you have read permissions on it */
	ret = inode_permission(path->dentry->d_inode, MAY_READ);
	if (ret)
		path_put(path);
out:
	return ret;
}

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eric paris
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90.43%
1
33.33%
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al viro
20
9.57%
2
66.67%
Total
209
100.00%
3
100.00%



static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
					    __u32 mask,
					    unsigned int flags,
					    int *destroy)
{
	__u32 oldmask = 0;

	spin_lock(&fsn_mark->lock);
	if (!(flags & FAN_MARK_IGNORED_MASK)) {
		__u32 tmask = fsn_mark->mask & ~mask;

		if (flags & FAN_MARK_ONDIR)
			tmask &= ~FAN_ONDIR;

		oldmask = fsn_mark->mask;
		fsnotify_set_mark_mask_locked(fsn_mark, tmask);
	} else {
		__u32 tmask = fsn_mark->ignored_mask & ~mask;
		if (flags & FAN_MARK_ONDIR)
			tmask &= ~FAN_ONDIR;

		fsnotify_set_mark_ignored_mask_locked(fsn_mark, tmask);
	}
	*destroy = !(fsn_mark->mask | fsn_mark->ignored_mask);
	spin_unlock(&fsn_mark->lock);

	return mask & oldmask;
}

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lino sanfilippo
lino sanfilippo
64
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4
57.14%
andreas gruenbacher
andreas gruenbacher
43
31.16%
1
14.29%
eric paris
eric paris
31
22.46%
2
28.57%
Total
138
100.00%
7
100.00%



static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
					 struct vfsmount *mnt, __u32 mask,
					 unsigned int flags)
{
	struct fsnotify_mark *fsn_mark = NULL;
	__u32 removed;
	int destroy_mark;

	mutex_lock(&group->mark_mutex);
	fsn_mark = fsnotify_find_vfsmount_mark(group, mnt);
	if (!fsn_mark) {
		mutex_unlock(&group->mark_mutex);
		return -ENOENT;
	}

	removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags,
						 &destroy_mark);
	if (destroy_mark)
		fsnotify_detach_mark(fsn_mark);
	mutex_unlock(&group->mark_mutex);
	if (destroy_mark)
		fsnotify_free_mark(fsn_mark);

	fsnotify_put_mark(fsn_mark);
	if (removed & real_mount(mnt)->mnt_fsnotify_mask)
		fsnotify_recalc_vfsmount_mask(mnt);

	return 0;
}

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andreas gruenbacher
andreas gruenbacher
42
30.88%
2
25.00%
eric paris
eric paris
41
30.15%
2
25.00%
lino sanfilippo
lino sanfilippo
40
29.41%
2
25.00%
jan kara
jan kara
10
7.35%
1
12.50%
al viro
al viro
3
2.21%
1
12.50%
Total
136
100.00%
8
100.00%



static int fanotify_remove_inode_mark(struct fsnotify_group *group,
				      struct inode *inode, __u32 mask,
				      unsigned int flags)
{
	struct fsnotify_mark *fsn_mark = NULL;
	__u32 removed;
	int destroy_mark;

	mutex_lock(&group->mark_mutex);
	fsn_mark = fsnotify_find_inode_mark(group, inode);
	if (!fsn_mark) {
		mutex_unlock(&group->mark_mutex);
		return -ENOENT;
	}

	removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags,
						 &destroy_mark);
	if (destroy_mark)
		fsnotify_detach_mark(fsn_mark);
	mutex_unlock(&group->mark_mutex);
	if (destroy_mark)
		fsnotify_free_mark(fsn_mark);

	/* matches the fsnotify_find_inode_mark() */
	fsnotify_put_mark(fsn_mark);
	if (removed & inode->i_fsnotify_mask)
		fsnotify_recalc_inode_mask(inode);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andreas gruenbacher
andreas gruenbacher
46
34.33%
2
22.22%
lino sanfilippo
lino sanfilippo
40
29.85%
2
22.22%
eric paris
eric paris
38
28.36%
4
44.44%
jan kara
jan kara
10
7.46%
1
11.11%
Total
134
100.00%
9
100.00%



static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark,
				       __u32 mask,
				       unsigned int flags)
{
	__u32 oldmask = -1;

	spin_lock(&fsn_mark->lock);
	if (!(flags & FAN_MARK_IGNORED_MASK)) {
		__u32 tmask = fsn_mark->mask | mask;

		if (flags & FAN_MARK_ONDIR)
			tmask |= FAN_ONDIR;

		oldmask = fsn_mark->mask;
		fsnotify_set_mark_mask_locked(fsn_mark, tmask);
	} else {
		__u32 tmask = fsn_mark->ignored_mask | mask;
		if (flags & FAN_MARK_ONDIR)
			tmask |= FAN_ONDIR;

		fsnotify_set_mark_ignored_mask_locked(fsn_mark, tmask);
		if (flags & FAN_MARK_IGNORED_SURV_MODIFY)
			fsn_mark->flags |= FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY;
	}
	spin_unlock(&fsn_mark->lock);

	return mask & ~oldmask;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
eric paris
eric paris
53
40.77%
4
66.67%
andreas gruenbacher
andreas gruenbacher
47
36.15%
1
16.67%
lino sanfilippo
lino sanfilippo
30
23.08%
1
16.67%
Total
130
100.00%
6
100.00%



static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group,
						   struct inode *inode,
						   struct vfsmount *mnt)
{
	struct fsnotify_mark *mark;
	int ret;

	if (atomic_read(&group->num_marks) > group->fanotify_data.max_marks)
		return ERR_PTR(-ENOSPC);

	mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL);
	if (!mark)
		return ERR_PTR(-ENOMEM);

	fsnotify_init_mark(mark, fanotify_free_mark);
	ret = fsnotify_add_mark_locked(mark, group, inode, mnt, 0);
	if (ret) {
		fsnotify_put_mark(mark);
		return ERR_PTR(ret);
	}

	return mark;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
eric paris
eric paris
70
59.83%
2
33.33%
lino sanfilippo
lino sanfilippo
42
35.90%
3
50.00%
andreas gruenbacher
andreas gruenbacher
5
4.27%
1
16.67%
Total
117
100.00%
6
100.00%



static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
				      struct vfsmount *mnt, __u32 mask,
				      unsigned int flags)
{
	struct fsnotify_mark *fsn_mark;
	__u32 added;

	mutex_lock(&group->mark_mutex);
	fsn_mark = fsnotify_find_vfsmount_mark(group, mnt);
	if (!fsn_mark) {
		fsn_mark = fanotify_add_new_mark(group, NULL, mnt);
		if (IS_ERR(fsn_mark)) {
			mutex_unlock(&group->mark_mutex);
			return PTR_ERR(fsn_mark);
		}
	}
	added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
	mutex_unlock(&group->mark_mutex);

	if (added & ~real_mount(mnt)->mnt_fsnotify_mask)
		fsnotify_recalc_vfsmount_mask(mnt);

	fsnotify_put_mark(fsn_mark);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
lino sanfilippo
lino sanfilippo
101
75.94%
3
37.50%
andreas gruenbacher
andreas gruenbacher
22
16.54%
1
12.50%
eric paris
eric paris
7
5.26%
3
37.50%
al viro
al viro
3
2.26%
1
12.50%
Total
133
100.00%
8
100.00%



static int fanotify_add_inode_mark(struct fsnotify_group *group,
				   struct inode *inode, __u32 mask,
				   unsigned int flags)
{
	struct fsnotify_mark *fsn_mark;
	__u32 added;

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

	/*
         * If some other task has this inode open for write we should not add
         * an ignored mark, unless that ignored mark is supposed to survive
         * modification changes anyway.
         */
	if ((flags & FAN_MARK_IGNORED_MASK) &&
	    !(flags & FAN_MARK_IGNORED_SURV_MODIFY) &&
	    (atomic_read(&inode->i_writecount) > 0))
		return 0;

	mutex_lock(&group->mark_mutex);
	fsn_mark = fsnotify_find_inode_mark(group, inode);
	if (!fsn_mark) {
		fsn_mark = fanotify_add_new_mark(group, inode, NULL);
		if (IS_ERR(fsn_mark)) {
			mutex_unlock(&group->mark_mutex);
			return PTR_ERR(fsn_mark);
		}
	}
	added = fanotify_mark_add_to_mask(fsn_mark,