f06fd98759
Move locking of a mark list into fsnotify_find_mark(). This reduces code churn in the following patch changing lock protecting the list. Reviewed-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
132 lines
3.7 KiB
C
132 lines
3.7 KiB
C
/*
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* Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/atomic.h>
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#include <linux/fsnotify_backend.h>
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#include "fsnotify.h"
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#include "../internal.h"
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void fsnotify_recalc_inode_mask(struct inode *inode)
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{
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fsnotify_recalc_mask(inode->i_fsnotify_marks);
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}
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struct inode *fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
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{
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struct inode *inode = mark->connector->inode;
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bool empty;
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BUG_ON(!mutex_is_locked(&mark->group->mark_mutex));
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assert_spin_locked(&mark->lock);
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spin_lock(&inode->i_lock);
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hlist_del_init_rcu(&mark->obj_list);
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empty = hlist_empty(&mark->connector->list);
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mark->connector = NULL;
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spin_unlock(&inode->i_lock);
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fsnotify_recalc_mask(inode->i_fsnotify_marks);
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return empty ? inode : NULL;
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}
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/*
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* Given a group clear all of the inode marks associated with that group.
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*/
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void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group)
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{
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fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_OBJ_TYPE_INODE);
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}
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/*
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* given a group and inode, find the mark associated with that combination.
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* if found take a reference to that mark and return it, else return NULL
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*/
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struct fsnotify_mark *fsnotify_find_inode_mark(struct fsnotify_group *group,
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struct inode *inode)
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{
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return fsnotify_find_mark(inode->i_fsnotify_marks, group);
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}
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/**
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* fsnotify_unmount_inodes - an sb is unmounting. handle any watched inodes.
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* @sb: superblock being unmounted.
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*
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* Called during unmount with no locks held, so needs to be safe against
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* concurrent modifiers. We temporarily drop sb->s_inode_list_lock and CAN block.
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*/
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void fsnotify_unmount_inodes(struct super_block *sb)
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{
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struct inode *inode, *iput_inode = NULL;
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spin_lock(&sb->s_inode_list_lock);
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list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
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/*
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* We cannot __iget() an inode in state I_FREEING,
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* I_WILL_FREE, or I_NEW which is fine because by that point
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* the inode cannot have any associated watches.
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*/
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spin_lock(&inode->i_lock);
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if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) {
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spin_unlock(&inode->i_lock);
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continue;
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}
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/*
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* If i_count is zero, the inode cannot have any watches and
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* doing an __iget/iput with MS_ACTIVE clear would actually
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* evict all inodes with zero i_count from icache which is
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* unnecessarily violent and may in fact be illegal to do.
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*/
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if (!atomic_read(&inode->i_count)) {
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spin_unlock(&inode->i_lock);
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continue;
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}
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__iget(inode);
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spin_unlock(&inode->i_lock);
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spin_unlock(&sb->s_inode_list_lock);
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if (iput_inode)
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iput(iput_inode);
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/* for each watch, send FS_UNMOUNT and then remove it */
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fsnotify(inode, FS_UNMOUNT, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
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fsnotify_inode_delete(inode);
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iput_inode = inode;
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spin_lock(&sb->s_inode_list_lock);
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}
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spin_unlock(&sb->s_inode_list_lock);
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if (iput_inode)
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iput(iput_inode);
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}
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