Release 4.11 fs/notify/inotify/inotify_fsnotify.c
/*
* fs/inotify_user.c - inotify support for userspace
*
* Authors:
* John McCutchan <ttb@tentacle.dhs.org>
* Robert Love <rml@novell.com>
*
* Copyright (C) 2005 John McCutchan
* Copyright 2006 Hewlett-Packard Development Company, L.P.
*
* Copyright (C) 2009 Eric Paris <Red Hat Inc>
* inotify was largely rewriten to make use of the fsnotify infrastructure
*
* 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.
*/
#include <linux/dcache.h> /* d_unlinked */
#include <linux/fs.h> /* struct inode */
#include <linux/fsnotify_backend.h>
#include <linux/inotify.h>
#include <linux/path.h> /* struct path */
#include <linux/slab.h> /* kmem_* */
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/sched/user.h>
#include "inotify.h"
/*
* Check if 2 events contain the same information.
*/
static bool event_compare(struct fsnotify_event *old_fsn,
struct fsnotify_event *new_fsn)
{
struct inotify_event_info *old, *new;
if (old_fsn->mask & FS_IN_IGNORED)
return false;
old = INOTIFY_E(old_fsn);
new = INOTIFY_E(new_fsn);
if ((old_fsn->mask == new_fsn->mask) &&
(old_fsn->inode == new_fsn->inode) &&
(old->name_len == new->name_len) &&
(!old->name_len || !strcmp(old->name, new->name)))
return true;
return false;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 63 | 59.43% | 1 | 50.00% |
| Jan Kara | 43 | 40.57% | 1 | 50.00% |
| Total | 106 | 100.00% | 2 | 100.00% |
static int inotify_merge(struct list_head *list,
struct fsnotify_event *event)
{
struct fsnotify_event *last_event;
last_event = list_entry(list->prev, struct fsnotify_event, list);
return event_compare(last_event, event);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 38 | 88.37% | 1 | 33.33% |
| Jan Kara | 5 | 11.63% | 2 | 66.67% |
| Total | 43 | 100.00% | 3 | 100.00% |
int inotify_handle_event(struct fsnotify_group *group,
struct inode *inode,
struct fsnotify_mark *inode_mark,
struct fsnotify_mark *vfsmount_mark,
u32 mask, const void *data, int data_type,
const unsigned char *file_name, u32 cookie)
{
struct inotify_inode_mark *i_mark;
struct inotify_event_info *event;
struct fsnotify_event *fsn_event;
int ret;
int len = 0;
int alloc_len = sizeof(struct inotify_event_info);
BUG_ON(vfsmount_mark);
if ((inode_mark->mask & FS_EXCL_UNLINK) &&
(data_type == FSNOTIFY_EVENT_PATH)) {
const struct path *path = data;
if (d_unlinked(path->dentry))
return 0;
}
if (file_name) {
len = strlen(file_name);
alloc_len += len + 1;
}
pr_debug("%s: group=%p inode=%p mask=%x\n", __func__, group, inode,
mask);
i_mark = container_of(inode_mark, struct inotify_inode_mark,
fsn_mark);
event = kmalloc(alloc_len, GFP_KERNEL);
if (unlikely(!event))
return -ENOMEM;
fsn_event = &event->fse;
fsnotify_init_event(fsn_event, inode, mask);
event->wd = i_mark->wd;
event->sync_cookie = cookie;
event->name_len = len;
if (len)
strcpy(event->name, file_name);
ret = fsnotify_add_event(group, fsn_event, inotify_merge);
if (ret) {
/* Our event wasn't used in the end. Free it. */
fsnotify_destroy_event(group, fsn_event);
}
if (inode_mark->mask & IN_ONESHOT)
fsnotify_destroy_mark(inode_mark, group);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jan Kara | 148 | 53.43% | 5 | 29.41% |
| Eric Paris | 122 | 44.04% | 9 | 52.94% |
| Lino Sanfilippo | 5 | 1.81% | 2 | 11.76% |
| Al Viro | 2 | 0.72% | 1 | 5.88% |
| Total | 277 | 100.00% | 17 | 100.00% |
static void inotify_freeing_mark(struct fsnotify_mark *fsn_mark, struct fsnotify_group *group)
{
inotify_ignored_and_remove_idr(fsn_mark, group);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 23 | 100.00% | 4 | 100.00% |
| Total | 23 | 100.00% | 4 | 100.00% |
/*
* This is NEVER supposed to be called. Inotify marks should either have been
* removed from the idr when the watch was removed or in the
* fsnotify_destroy_mark_by_group() call when the inotify instance was being
* torn down. This is only called if the idr is about to be freed but there
* are still marks in it.
*/
static int idr_callback(int id, void *p, void *data)
{
struct fsnotify_mark *fsn_mark;
struct inotify_inode_mark *i_mark;
static bool warned = false;
if (warned)
return 0;
warned = true;
fsn_mark = p;
i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark);
WARN(1, "inotify closing but id=%d for fsn_mark=%p in group=%p still in "
"idr. Probably leaking memory\n", id, p, data);
/*
* I'm taking the liberty of assuming that the mark in question is a
* valid address and I'm dereferencing it. This might help to figure
* out why we got here and the panic is no worse than the original
* BUG() that was here.
*/
if (fsn_mark)
printk(KERN_WARNING "fsn_mark->group=%p inode=%p wd=%d\n",
fsn_mark->group, fsn_mark->inode, i_mark->wd);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 100 | 100.00% | 5 | 100.00% |
| Total | 100 | 100.00% | 5 | 100.00% |
static void inotify_free_group_priv(struct fsnotify_group *group)
{
/* ideally the idr is empty and we won't hit the BUG in the callback */
idr_for_each(&group->inotify_data.idr, idr_callback, group);
idr_destroy(&group->inotify_data.idr);
if (group->inotify_data.ucounts)
dec_inotify_instances(group->inotify_data.ucounts);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 41 | 77.36% | 3 | 50.00% |
| Sasha Levin | 8 | 15.09% | 1 | 16.67% |
| Nikolay Borisov | 3 | 5.66% | 1 | 16.67% |
| Lucas De Marchi | 1 | 1.89% | 1 | 16.67% |
| Total | 53 | 100.00% | 6 | 100.00% |
static void inotify_free_event(struct fsnotify_event *fsn_event)
{
kfree(INOTIFY_E(fsn_event));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 10 | 52.63% | 1 | 33.33% |
| Jan Kara | 7 | 36.84% | 1 | 33.33% |
| Lino Sanfilippo | 2 | 10.53% | 1 | 33.33% |
| Total | 19 | 100.00% | 3 | 100.00% |
const struct fsnotify_ops inotify_fsnotify_ops = {
.handle_event = inotify_handle_event,
.free_group_priv = inotify_free_group_priv,
.free_event = inotify_free_event,
.freeing_mark = inotify_freeing_mark,
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 452 | 65.99% | 15 | 53.57% |
| Jan Kara | 206 | 30.07% | 5 | 17.86% |
| Sasha Levin | 8 | 1.17% | 1 | 3.57% |
| Lino Sanfilippo | 7 | 1.02% | 2 | 7.14% |
| Pavel Emelyanov | 3 | 0.44% | 1 | 3.57% |
| Ingo Molnar | 3 | 0.44% | 1 | 3.57% |
| Nikolay Borisov | 3 | 0.44% | 1 | 3.57% |
| Al Viro | 2 | 0.29% | 1 | 3.57% |
| Lucas De Marchi | 1 | 0.15% | 1 | 3.57% |
| Total | 685 | 100.00% | 28 | 100.00% |
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