Release 4.11 fs/notify/inode_mark.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/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/atomic.h>
#include <linux/fsnotify_backend.h>
#include "fsnotify.h"
#include "../internal.h"
/*
* Recalculate the inode->i_fsnotify_mask, or the mask of all FS_* event types
* any notifier is interested in hearing for this inode.
*/
void fsnotify_recalc_inode_mask(struct inode *inode)
{
spin_lock(&inode->i_lock);
inode->i_fsnotify_mask = fsnotify_recalc_mask(&inode->i_fsnotify_marks);
spin_unlock(&inode->i_lock);
__fsnotify_update_child_dentry_flags(inode);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 39 | 90.70% | 2 | 66.67% |
| Jan Kara | 4 | 9.30% | 1 | 33.33% |
| Total | 43 | 100.00% | 3 | 100.00% |
void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
{
struct inode *inode = mark->inode;
BUG_ON(!mutex_is_locked(&mark->group->mark_mutex));
assert_spin_locked(&mark->lock);
spin_lock(&inode->i_lock);
hlist_del_init_rcu(&mark->obj_list);
mark->inode = NULL;
/*
* this mark is now off the inode->i_fsnotify_marks list and we
* hold the inode->i_lock, so this is the perfect time to update the
* inode->i_fsnotify_mask
*/
inode->i_fsnotify_mask = fsnotify_recalc_mask(&inode->i_fsnotify_marks);
spin_unlock(&inode->i_lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 66 | 78.57% | 5 | 71.43% |
| Jan Kara | 9 | 10.71% | 1 | 14.29% |
| Lino Sanfilippo | 9 | 10.71% | 1 | 14.29% |
| Total | 84 | 100.00% | 7 | 100.00% |
/*
* Given a group clear all of the inode marks associated with that group.
*/
void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group)
{
fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_MARK_FLAG_INODE);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 17 | 100.00% | 1 | 100.00% |
| Total | 17 | 100.00% | 1 | 100.00% |
/*
* given a group and inode, find the mark associated with that combination.
* if found take a reference to that mark and return it, else return NULL
*/
struct fsnotify_mark *fsnotify_find_inode_mark(struct fsnotify_group *group,
struct inode *inode)
{
struct fsnotify_mark *mark;
spin_lock(&inode->i_lock);
mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group);
spin_unlock(&inode->i_lock);
return mark;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andreas Gruenbacher | 25 | 47.17% | 1 | 25.00% |
| Eric Paris | 22 | 41.51% | 2 | 50.00% |
| Jan Kara | 6 | 11.32% | 1 | 25.00% |
| Total | 53 | 100.00% | 4 | 100.00% |
/*
* If we are setting a mark mask on an inode mark we should pin the inode
* in memory.
*/
void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *mark,
__u32 mask)
{
struct inode *inode;
assert_spin_locked(&mark->lock);
if (mask &&
mark->inode &&
!(mark->flags & FSNOTIFY_MARK_FLAG_OBJECT_PINNED)) {
mark->flags |= FSNOTIFY_MARK_FLAG_OBJECT_PINNED;
inode = igrab(mark->inode);
/*
* we shouldn't be able to get here if the inode wasn't
* already safely held in memory. But bug in case it
* ever is wrong.
*/
BUG_ON(!inode);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 67 | 100.00% | 2 | 100.00% |
| Total | 67 | 100.00% | 2 | 100.00% |
/*
* Attach an initialized mark to a given inode.
* These marks may be used for the fsnotify backend to determine which
* event types should be delivered to which group and for which inodes. These
* marks are ordered according to priority, highest number first, and then by
* the group's location in memory.
*/
int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
struct fsnotify_group *group, struct inode *inode,
int allow_dups)
{
int ret;
mark->flags |= FSNOTIFY_MARK_FLAG_INODE;
BUG_ON(!mutex_is_locked(&group->mark_mutex));
assert_spin_locked(&mark->lock);
spin_lock(&inode->i_lock);
mark->inode = inode;
ret = fsnotify_add_mark_list(&inode->i_fsnotify_marks, mark,
allow_dups);
inode->i_fsnotify_mask = fsnotify_recalc_mask(&inode->i_fsnotify_marks);
spin_unlock(&inode->i_lock);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 80 | 77.67% | 9 | 69.23% |
| Jan Kara | 13 | 12.62% | 2 | 15.38% |
| Lino Sanfilippo | 9 | 8.74% | 1 | 7.69% |
| Sasha Levin | 1 | 0.97% | 1 | 7.69% |
| Total | 103 | 100.00% | 13 | 100.00% |
/**
* fsnotify_unmount_inodes - an sb is unmounting. handle any watched inodes.
* @sb: superblock being unmounted.
*
* Called during unmount with no locks held, so needs to be safe against
* concurrent modifiers. We temporarily drop sb->s_inode_list_lock and CAN block.
*/
void fsnotify_unmount_inodes(struct super_block *sb)
{
struct inode *inode, *iput_inode = NULL;
spin_lock(&sb->s_inode_list_lock);
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
/*
* We cannot __iget() an inode in state I_FREEING,
* I_WILL_FREE, or I_NEW which is fine because by that point
* the inode cannot have any associated watches.
*/
spin_lock(&inode->i_lock);
if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) {
spin_unlock(&inode->i_lock);
continue;
}
/*
* If i_count is zero, the inode cannot have any watches and
* doing an __iget/iput with MS_ACTIVE clear would actually
* evict all inodes with zero i_count from icache which is
* unnecessarily violent and may in fact be illegal to do.
*/
if (!atomic_read(&inode->i_count)) {
spin_unlock(&inode->i_lock);
continue;
}
__iget(inode);
spin_unlock(&inode->i_lock);
spin_unlock(&sb->s_inode_list_lock);
if (iput_inode)
iput(iput_inode);
/* for each watch, send FS_UNMOUNT and then remove it */
fsnotify(inode, FS_UNMOUNT, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
fsnotify_inode_delete(inode);
iput_inode = inode;
spin_lock(&sb->s_inode_list_lock);
}
spin_unlock(&sb->s_inode_list_lock);
if (iput_inode)
iput(iput_inode);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 98 | 56.00% | 1 | 16.67% |
| Dave Chinner | 51 | 29.14% | 2 | 33.33% |
| Jan Kara | 15 | 8.57% | 1 | 16.67% |
| Al Viro | 11 | 6.29% | 2 | 33.33% |
| Total | 175 | 100.00% | 6 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Paris | 420 | 72.54% | 15 | 55.56% |
| Dave Chinner | 55 | 9.50% | 3 | 11.11% |
| Jan Kara | 48 | 8.29% | 3 | 11.11% |
| Andreas Gruenbacher | 25 | 4.32% | 1 | 3.70% |
| Lino Sanfilippo | 18 | 3.11% | 1 | 3.70% |
| Al Viro | 11 | 1.90% | 2 | 7.41% |
| Sasha Levin | 1 | 0.17% | 1 | 3.70% |
| Arun Sharma | 1 | 0.17% | 1 | 3.70% |
| Total | 579 | 100.00% | 27 | 100.00% |
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