Release 4.15 fs/notify/group.c
/*
* Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/srcu.h>
#include <linux/rculist.h>
#include <linux/wait.h>
#include <linux/fsnotify_backend.h>
#include "fsnotify.h"
#include <linux/atomic.h>
/*
* Final freeing of a group
*/
static void fsnotify_final_destroy_group(struct fsnotify_group *group)
{
if (group->ops->free_group_priv)
group->ops->free_group_priv(group);
kfree(group);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 32 | 96.97% | 2 | 66.67% |
| Andrew Morton | 1 | 3.03% | 1 | 33.33% |
| Total | 33 | 100.00% | 3 | 100.00% |
/*
* Stop queueing new events for this group. Once this function returns
* fsnotify_add_event() will not add any new events to the group's queue.
*/
void fsnotify_group_stop_queueing(struct fsnotify_group *group)
{
spin_lock(&group->notification_lock);
group->shutdown = true;
spin_unlock(&group->notification_lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jan Kara | 32 | 100.00% | 2 | 100.00% |
| Total | 32 | 100.00% | 2 | 100.00% |
/*
* Trying to get rid of a group. Remove all marks, flush all events and release
* the group reference.
* Note that another thread calling fsnotify_clear_marks_by_group() may still
* hold a ref to the group.
*/
void fsnotify_destroy_group(struct fsnotify_group *group)
{
/*
* Stop queueing new events. The code below is careful enough to not
* require this but fanotify needs to stop queuing events even before
* fsnotify_destroy_group() is called and this makes the other callers
* of fsnotify_destroy_group() to see the same behavior.
*/
fsnotify_group_stop_queueing(group);
/* Clear all marks for this group and queue them for destruction */
fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_ALL_TYPES);
/*
* Some marks can still be pinned when waiting for response from
* userspace. Wait for those now. fsnotify_prepare_user_wait() will
* not succeed now so this wait is race-free.
*/
wait_event(group->notification_waitq, !atomic_read(&group->user_waits));
/*
* Wait until all marks get really destroyed. We could actually destroy
* them ourselves instead of waiting for worker to do it, however that
* would be racy as worker can already be processing some marks before
* we even entered fsnotify_destroy_group().
*/
fsnotify_wait_marks_destroyed();
/*
* Since we have waited for fsnotify_mark_srcu in
* fsnotify_mark_destroy_list() there can be no outstanding event
* notification against this group. So clearing the notification queue
* of all events is reliable now.
*/
fsnotify_flush_notify(group);
/*
* Destroy overflow event (we cannot use fsnotify_destroy_event() as
* that deliberately ignores overflow events.
*/
if (group->overflow_event)
group->ops->free_event(group->overflow_event);
fsnotify_put_group(group);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jan Kara | 49 | 66.22% | 5 | 62.50% |
| Eric Paris | 22 | 29.73% | 2 | 25.00% |
| Lino Sanfilippo | 3 | 4.05% | 1 | 12.50% |
| Total | 74 | 100.00% | 8 | 100.00% |
/*
* Get reference to a group.
*/
void fsnotify_get_group(struct fsnotify_group *group)
{
refcount_inc(&group->refcnt);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lino Sanfilippo | 17 | 94.44% | 1 | 50.00% |
| Elena Reshetova | 1 | 5.56% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
/*
* Drop a reference to a group. Free it if it's through.
*/
void fsnotify_put_group(struct fsnotify_group *group)
{
if (refcount_dec_and_test(&group->refcnt))
fsnotify_final_destroy_group(group);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 23 | 92.00% | 1 | 33.33% |
| Lino Sanfilippo | 1 | 4.00% | 1 | 33.33% |
| Elena Reshetova | 1 | 4.00% | 1 | 33.33% |
| Total | 25 | 100.00% | 3 | 100.00% |
/*
* Create a new fsnotify_group and hold a reference for the group returned.
*/
struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops)
{
struct fsnotify_group *group;
group = kzalloc(sizeof(struct fsnotify_group), GFP_KERNEL);
if (!group)
return ERR_PTR(-ENOMEM);
/* set to 0 when there a no external references to this group */
refcount_set(&group->refcnt, 1);
atomic_set(&group->num_marks, 0);
atomic_set(&group->user_waits, 0);
spin_lock_init(&group->notification_lock);
INIT_LIST_HEAD(&group->notification_list);
init_waitqueue_head(&group->notification_waitq);
group->max_events = UINT_MAX;
mutex_init(&group->mark_mutex);
INIT_LIST_HEAD(&group->marks_list);
group->ops = ops;
return group;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 113 | 87.60% | 7 | 58.33% |
| Jan Kara | 12 | 9.30% | 2 | 16.67% |
| Lino Sanfilippo | 3 | 2.33% | 2 | 16.67% |
| Elena Reshetova | 1 | 0.78% | 1 | 8.33% |
| Total | 129 | 100.00% | 12 | 100.00% |
int fsnotify_fasync(int fd, struct file *file, int on)
{
struct fsnotify_group *group = file->private_data;
return fasync_helper(fd, file, on, &group->fsn_fa) >= 0 ? 0 : -EIO;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 47 | 100.00% | 1 | 100.00% |
| Total | 47 | 100.00% | 1 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 267 | 68.11% | 9 | 40.91% |
| Jan Kara | 94 | 23.98% | 7 | 31.82% |
| Lino Sanfilippo | 26 | 6.63% | 3 | 13.64% |
| Elena Reshetova | 3 | 0.77% | 1 | 4.55% |
| Arun Sharma | 1 | 0.26% | 1 | 4.55% |
| Andrew Morton | 1 | 0.26% | 1 | 4.55% |
| Total | 392 | 100.00% | 22 | 100.00% |
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