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![Amir Goldstein](/assets/img/avatar_default.png)
Setting flags FAN_ONDIR FAN_EVENT_ON_CHILD in ignore mask has no effect. The FAN_EVENT_ON_CHILD flag in mask implicitly applies to ignore mask and ignore mask is always implicitly applied to events on directories. Define a mark flag that replaces this legacy behavior with logic of applying the ignore mask according to event flags in ignore mask. Implement the new logic to prepare for supporting an ignore mask that ignores events on children and ignore mask that does not ignore events on directories. To emphasize the change in terminology, also rename ignored_mask mark member to ignore_mask and use accessors to get only the effective ignored events or the ignored events and flags. This change in terminology finally aligns with the "ignore mask" language in man pages and in most of the comments. Link: https://lore.kernel.org/r/20220629144210.2983229-2-amir73il@gmail.com Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
602 lines
18 KiB
C
602 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com>
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*/
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#include <linux/dcache.h>
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#include <linux/fs.h>
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#include <linux/gfp.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mount.h>
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#include <linux/srcu.h>
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#include <linux/fsnotify_backend.h>
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#include "fsnotify.h"
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/*
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* Clear all of the marks on an inode when it is being evicted from core
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*/
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void __fsnotify_inode_delete(struct inode *inode)
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{
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fsnotify_clear_marks_by_inode(inode);
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}
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EXPORT_SYMBOL_GPL(__fsnotify_inode_delete);
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void __fsnotify_vfsmount_delete(struct vfsmount *mnt)
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{
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fsnotify_clear_marks_by_mount(mnt);
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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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static 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 SB_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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* However, we should have been called /after/ evict_inodes
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* removed all zero refcount inodes, in any case. Test to
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* be sure.
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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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iput(iput_inode);
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/* for each watch, send FS_UNMOUNT and then remove it */
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fsnotify_inode(inode, FS_UNMOUNT);
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fsnotify_inode_delete(inode);
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iput_inode = inode;
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cond_resched();
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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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iput(iput_inode);
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}
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void fsnotify_sb_delete(struct super_block *sb)
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{
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fsnotify_unmount_inodes(sb);
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fsnotify_clear_marks_by_sb(sb);
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/* Wait for outstanding object references from connectors */
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wait_var_event(&sb->s_fsnotify_connectors,
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!atomic_long_read(&sb->s_fsnotify_connectors));
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}
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/*
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* Given an inode, first check if we care what happens to our children. Inotify
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* and dnotify both tell their parents about events. If we care about any event
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* on a child we run all of our children and set a dentry flag saying that the
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* parent cares. Thus when an event happens on a child it can quickly tell if
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* if there is a need to find a parent and send the event to the parent.
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*/
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void __fsnotify_update_child_dentry_flags(struct inode *inode)
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{
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struct dentry *alias;
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int watched;
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if (!S_ISDIR(inode->i_mode))
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return;
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/* determine if the children should tell inode about their events */
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watched = fsnotify_inode_watches_children(inode);
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spin_lock(&inode->i_lock);
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/* run all of the dentries associated with this inode. Since this is a
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* directory, there damn well better only be one item on this list */
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hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
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struct dentry *child;
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/* run all of the children of the original inode and fix their
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* d_flags to indicate parental interest (their parent is the
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* original inode) */
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spin_lock(&alias->d_lock);
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list_for_each_entry(child, &alias->d_subdirs, d_child) {
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if (!child->d_inode)
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continue;
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spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED);
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if (watched)
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child->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED;
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else
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child->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED;
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spin_unlock(&child->d_lock);
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}
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spin_unlock(&alias->d_lock);
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}
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spin_unlock(&inode->i_lock);
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}
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/* Are inode/sb/mount interested in parent and name info with this event? */
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static bool fsnotify_event_needs_parent(struct inode *inode, struct mount *mnt,
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__u32 mask)
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{
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__u32 marks_mask = 0;
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/* We only send parent/name to inode/sb/mount for events on non-dir */
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if (mask & FS_ISDIR)
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return false;
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/*
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* All events that are possible on child can also may be reported with
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* parent/name info to inode/sb/mount. Otherwise, a watching parent
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* could result in events reported with unexpected name info to sb/mount.
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*/
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BUILD_BUG_ON(FS_EVENTS_POSS_ON_CHILD & ~FS_EVENTS_POSS_TO_PARENT);
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/* Did either inode/sb/mount subscribe for events with parent/name? */
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marks_mask |= fsnotify_parent_needed_mask(inode->i_fsnotify_mask);
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marks_mask |= fsnotify_parent_needed_mask(inode->i_sb->s_fsnotify_mask);
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if (mnt)
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marks_mask |= fsnotify_parent_needed_mask(mnt->mnt_fsnotify_mask);
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/* Did they subscribe for this event with parent/name info? */
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return mask & marks_mask;
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}
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/*
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* Notify this dentry's parent about a child's events with child name info
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* if parent is watching or if inode/sb/mount are interested in events with
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* parent and name info.
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*
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* Notify only the child without name info if parent is not watching and
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* inode/sb/mount are not interested in events with parent and name info.
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*/
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int __fsnotify_parent(struct dentry *dentry, __u32 mask, const void *data,
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int data_type)
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{
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const struct path *path = fsnotify_data_path(data, data_type);
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struct mount *mnt = path ? real_mount(path->mnt) : NULL;
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struct inode *inode = d_inode(dentry);
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struct dentry *parent;
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bool parent_watched = dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED;
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bool parent_needed, parent_interested;
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__u32 p_mask;
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struct inode *p_inode = NULL;
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struct name_snapshot name;
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struct qstr *file_name = NULL;
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int ret = 0;
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/*
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* Do inode/sb/mount care about parent and name info on non-dir?
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* Do they care about any event at all?
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*/
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if (!inode->i_fsnotify_marks && !inode->i_sb->s_fsnotify_marks &&
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(!mnt || !mnt->mnt_fsnotify_marks) && !parent_watched)
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return 0;
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parent = NULL;
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parent_needed = fsnotify_event_needs_parent(inode, mnt, mask);
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if (!parent_watched && !parent_needed)
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goto notify;
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/* Does parent inode care about events on children? */
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parent = dget_parent(dentry);
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p_inode = parent->d_inode;
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p_mask = fsnotify_inode_watches_children(p_inode);
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if (unlikely(parent_watched && !p_mask))
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__fsnotify_update_child_dentry_flags(p_inode);
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/*
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* Include parent/name in notification either if some notification
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* groups require parent info or the parent is interested in this event.
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*/
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parent_interested = mask & p_mask & ALL_FSNOTIFY_EVENTS;
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if (parent_needed || parent_interested) {
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/* When notifying parent, child should be passed as data */
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WARN_ON_ONCE(inode != fsnotify_data_inode(data, data_type));
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/* Notify both parent and child with child name info */
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take_dentry_name_snapshot(&name, dentry);
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file_name = &name.name;
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if (parent_interested)
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mask |= FS_EVENT_ON_CHILD;
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}
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notify:
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ret = fsnotify(mask, data, data_type, p_inode, file_name, inode, 0);
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if (file_name)
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release_dentry_name_snapshot(&name);
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dput(parent);
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return ret;
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}
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EXPORT_SYMBOL_GPL(__fsnotify_parent);
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static int fsnotify_handle_inode_event(struct fsnotify_group *group,
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struct fsnotify_mark *inode_mark,
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u32 mask, const void *data, int data_type,
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struct inode *dir, const struct qstr *name,
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u32 cookie)
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{
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const struct path *path = fsnotify_data_path(data, data_type);
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struct inode *inode = fsnotify_data_inode(data, data_type);
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const struct fsnotify_ops *ops = group->ops;
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if (WARN_ON_ONCE(!ops->handle_inode_event))
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return 0;
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if (WARN_ON_ONCE(!inode && !dir))
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return 0;
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if ((inode_mark->flags & FSNOTIFY_MARK_FLAG_EXCL_UNLINK) &&
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path && d_unlinked(path->dentry))
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return 0;
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/* Check interest of this mark in case event was sent with two marks */
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if (!(mask & inode_mark->mask & ALL_FSNOTIFY_EVENTS))
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return 0;
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return ops->handle_inode_event(inode_mark, mask, inode, dir, name, cookie);
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}
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static int fsnotify_handle_event(struct fsnotify_group *group, __u32 mask,
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const void *data, int data_type,
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struct inode *dir, const struct qstr *name,
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u32 cookie, struct fsnotify_iter_info *iter_info)
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{
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struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
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struct fsnotify_mark *parent_mark = fsnotify_iter_parent_mark(iter_info);
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int ret;
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if (WARN_ON_ONCE(fsnotify_iter_sb_mark(iter_info)) ||
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WARN_ON_ONCE(fsnotify_iter_vfsmount_mark(iter_info)))
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return 0;
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/*
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* For FS_RENAME, 'dir' is old dir and 'data' is new dentry.
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* The only ->handle_inode_event() backend that supports FS_RENAME is
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* dnotify, where it means file was renamed within same parent.
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*/
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if (mask & FS_RENAME) {
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struct dentry *moved = fsnotify_data_dentry(data, data_type);
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if (dir != moved->d_parent->d_inode)
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return 0;
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}
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if (parent_mark) {
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ret = fsnotify_handle_inode_event(group, parent_mark, mask,
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data, data_type, dir, name, 0);
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if (ret)
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return ret;
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}
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if (!inode_mark)
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return 0;
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if (mask & FS_EVENT_ON_CHILD) {
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/*
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* Some events can be sent on both parent dir and child marks
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* (e.g. FS_ATTRIB). If both parent dir and child are
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* watching, report the event once to parent dir with name (if
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* interested) and once to child without name (if interested).
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* The child watcher is expecting an event without a file name
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* and without the FS_EVENT_ON_CHILD flag.
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*/
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mask &= ~FS_EVENT_ON_CHILD;
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dir = NULL;
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name = NULL;
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}
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return fsnotify_handle_inode_event(group, inode_mark, mask, data, data_type,
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dir, name, cookie);
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}
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static int send_to_group(__u32 mask, const void *data, int data_type,
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struct inode *dir, const struct qstr *file_name,
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u32 cookie, struct fsnotify_iter_info *iter_info)
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{
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struct fsnotify_group *group = NULL;
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__u32 test_mask = (mask & ALL_FSNOTIFY_EVENTS);
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__u32 marks_mask = 0;
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__u32 marks_ignore_mask = 0;
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bool is_dir = mask & FS_ISDIR;
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struct fsnotify_mark *mark;
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int type;
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if (!iter_info->report_mask)
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return 0;
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/* clear ignored on inode modification */
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if (mask & FS_MODIFY) {
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fsnotify_foreach_iter_mark_type(iter_info, mark, type) {
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if (!(mark->flags &
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FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
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mark->ignore_mask = 0;
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}
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}
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/* Are any of the group marks interested in this event? */
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fsnotify_foreach_iter_mark_type(iter_info, mark, type) {
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group = mark->group;
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marks_mask |= mark->mask;
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marks_ignore_mask |=
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fsnotify_effective_ignore_mask(mark, is_dir, type);
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}
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pr_debug("%s: group=%p mask=%x marks_mask=%x marks_ignore_mask=%x data=%p data_type=%d dir=%p cookie=%d\n",
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__func__, group, mask, marks_mask, marks_ignore_mask,
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data, data_type, dir, cookie);
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if (!(test_mask & marks_mask & ~marks_ignore_mask))
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return 0;
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if (group->ops->handle_event) {
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return group->ops->handle_event(group, mask, data, data_type, dir,
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file_name, cookie, iter_info);
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}
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return fsnotify_handle_event(group, mask, data, data_type, dir,
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file_name, cookie, iter_info);
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}
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static struct fsnotify_mark *fsnotify_first_mark(struct fsnotify_mark_connector **connp)
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{
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struct fsnotify_mark_connector *conn;
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struct hlist_node *node = NULL;
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conn = srcu_dereference(*connp, &fsnotify_mark_srcu);
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if (conn)
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node = srcu_dereference(conn->list.first, &fsnotify_mark_srcu);
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return hlist_entry_safe(node, struct fsnotify_mark, obj_list);
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}
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static struct fsnotify_mark *fsnotify_next_mark(struct fsnotify_mark *mark)
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{
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struct hlist_node *node = NULL;
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if (mark)
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node = srcu_dereference(mark->obj_list.next,
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&fsnotify_mark_srcu);
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return hlist_entry_safe(node, struct fsnotify_mark, obj_list);
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}
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/*
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* iter_info is a multi head priority queue of marks.
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* Pick a subset of marks from queue heads, all with the same group
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* and set the report_mask to a subset of the selected marks.
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* Returns false if there are no more groups to iterate.
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*/
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static bool fsnotify_iter_select_report_types(
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struct fsnotify_iter_info *iter_info)
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{
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struct fsnotify_group *max_prio_group = NULL;
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struct fsnotify_mark *mark;
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int type;
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/* Choose max prio group among groups of all queue heads */
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fsnotify_foreach_iter_type(type) {
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mark = iter_info->marks[type];
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if (mark &&
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fsnotify_compare_groups(max_prio_group, mark->group) > 0)
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max_prio_group = mark->group;
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}
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if (!max_prio_group)
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return false;
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/* Set the report mask for marks from same group as max prio group */
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iter_info->current_group = max_prio_group;
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iter_info->report_mask = 0;
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fsnotify_foreach_iter_type(type) {
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mark = iter_info->marks[type];
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if (mark && mark->group == iter_info->current_group) {
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/*
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* FSNOTIFY_ITER_TYPE_PARENT indicates that this inode
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* is watching children and interested in this event,
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* which is an event possible on child.
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* But is *this mark* watching children?
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*/
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if (type == FSNOTIFY_ITER_TYPE_PARENT &&
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!(mark->mask & FS_EVENT_ON_CHILD) &&
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!(fsnotify_ignore_mask(mark) & FS_EVENT_ON_CHILD))
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continue;
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fsnotify_iter_set_report_type(iter_info, type);
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}
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}
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return true;
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}
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/*
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* Pop from iter_info multi head queue, the marks that belong to the group of
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* current iteration step.
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*/
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static void fsnotify_iter_next(struct fsnotify_iter_info *iter_info)
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{
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struct fsnotify_mark *mark;
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int type;
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/*
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* We cannot use fsnotify_foreach_iter_mark_type() here because we
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* may need to advance a mark of type X that belongs to current_group
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* but was not selected for reporting.
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*/
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fsnotify_foreach_iter_type(type) {
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mark = iter_info->marks[type];
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if (mark && mark->group == iter_info->current_group)
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iter_info->marks[type] =
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fsnotify_next_mark(iter_info->marks[type]);
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}
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}
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/*
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* fsnotify - This is the main call to fsnotify.
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*
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* The VFS calls into hook specific functions in linux/fsnotify.h.
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* Those functions then in turn call here. Here will call out to all of the
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* registered fsnotify_group. Those groups can then use the notification event
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* in whatever means they feel necessary.
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*
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* @mask: event type and flags
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* @data: object that event happened on
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* @data_type: type of object for fanotify_data_XXX() accessors
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* @dir: optional directory associated with event -
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* if @file_name is not NULL, this is the directory that
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* @file_name is relative to
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* @file_name: optional file name associated with event
|
|
* @inode: optional inode associated with event -
|
|
* If @dir and @inode are both non-NULL, event may be
|
|
* reported to both.
|
|
* @cookie: inotify rename cookie
|
|
*/
|
|
int fsnotify(__u32 mask, const void *data, int data_type, struct inode *dir,
|
|
const struct qstr *file_name, struct inode *inode, u32 cookie)
|
|
{
|
|
const struct path *path = fsnotify_data_path(data, data_type);
|
|
struct super_block *sb = fsnotify_data_sb(data, data_type);
|
|
struct fsnotify_iter_info iter_info = {};
|
|
struct mount *mnt = NULL;
|
|
struct inode *inode2 = NULL;
|
|
struct dentry *moved;
|
|
int inode2_type;
|
|
int ret = 0;
|
|
__u32 test_mask, marks_mask;
|
|
|
|
if (path)
|
|
mnt = real_mount(path->mnt);
|
|
|
|
if (!inode) {
|
|
/* Dirent event - report on TYPE_INODE to dir */
|
|
inode = dir;
|
|
/* For FS_RENAME, inode is old_dir and inode2 is new_dir */
|
|
if (mask & FS_RENAME) {
|
|
moved = fsnotify_data_dentry(data, data_type);
|
|
inode2 = moved->d_parent->d_inode;
|
|
inode2_type = FSNOTIFY_ITER_TYPE_INODE2;
|
|
}
|
|
} else if (mask & FS_EVENT_ON_CHILD) {
|
|
/*
|
|
* Event on child - report on TYPE_PARENT to dir if it is
|
|
* watching children and on TYPE_INODE to child.
|
|
*/
|
|
inode2 = dir;
|
|
inode2_type = FSNOTIFY_ITER_TYPE_PARENT;
|
|
}
|
|
|
|
/*
|
|
* Optimization: srcu_read_lock() has a memory barrier which can
|
|
* be expensive. It protects walking the *_fsnotify_marks lists.
|
|
* However, if we do not walk the lists, we do not have to do
|
|
* SRCU because we have no references to any objects and do not
|
|
* need SRCU to keep them "alive".
|
|
*/
|
|
if (!sb->s_fsnotify_marks &&
|
|
(!mnt || !mnt->mnt_fsnotify_marks) &&
|
|
(!inode || !inode->i_fsnotify_marks) &&
|
|
(!inode2 || !inode2->i_fsnotify_marks))
|
|
return 0;
|
|
|
|
marks_mask = sb->s_fsnotify_mask;
|
|
if (mnt)
|
|
marks_mask |= mnt->mnt_fsnotify_mask;
|
|
if (inode)
|
|
marks_mask |= inode->i_fsnotify_mask;
|
|
if (inode2)
|
|
marks_mask |= inode2->i_fsnotify_mask;
|
|
|
|
|
|
/*
|
|
* If this is a modify event we may need to clear some ignore masks.
|
|
* In that case, the object with ignore masks will have the FS_MODIFY
|
|
* event in its mask.
|
|
* Otherwise, return if none of the marks care about this type of event.
|
|
*/
|
|
test_mask = (mask & ALL_FSNOTIFY_EVENTS);
|
|
if (!(test_mask & marks_mask))
|
|
return 0;
|
|
|
|
iter_info.srcu_idx = srcu_read_lock(&fsnotify_mark_srcu);
|
|
|
|
iter_info.marks[FSNOTIFY_ITER_TYPE_SB] =
|
|
fsnotify_first_mark(&sb->s_fsnotify_marks);
|
|
if (mnt) {
|
|
iter_info.marks[FSNOTIFY_ITER_TYPE_VFSMOUNT] =
|
|
fsnotify_first_mark(&mnt->mnt_fsnotify_marks);
|
|
}
|
|
if (inode) {
|
|
iter_info.marks[FSNOTIFY_ITER_TYPE_INODE] =
|
|
fsnotify_first_mark(&inode->i_fsnotify_marks);
|
|
}
|
|
if (inode2) {
|
|
iter_info.marks[inode2_type] =
|
|
fsnotify_first_mark(&inode2->i_fsnotify_marks);
|
|
}
|
|
|
|
/*
|
|
* We need to merge inode/vfsmount/sb mark lists so that e.g. inode mark
|
|
* ignore masks are properly reflected for mount/sb mark notifications.
|
|
* That's why this traversal is so complicated...
|
|
*/
|
|
while (fsnotify_iter_select_report_types(&iter_info)) {
|
|
ret = send_to_group(mask, data, data_type, dir, file_name,
|
|
cookie, &iter_info);
|
|
|
|
if (ret && (mask & ALL_FSNOTIFY_PERM_EVENTS))
|
|
goto out;
|
|
|
|
fsnotify_iter_next(&iter_info);
|
|
}
|
|
ret = 0;
|
|
out:
|
|
srcu_read_unlock(&fsnotify_mark_srcu, iter_info.srcu_idx);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fsnotify);
|
|
|
|
static __init int fsnotify_init(void)
|
|
{
|
|
int ret;
|
|
|
|
BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 23);
|
|
|
|
ret = init_srcu_struct(&fsnotify_mark_srcu);
|
|
if (ret)
|
|
panic("initializing fsnotify_mark_srcu");
|
|
|
|
fsnotify_mark_connector_cachep = KMEM_CACHE(fsnotify_mark_connector,
|
|
SLAB_PANIC);
|
|
|
|
return 0;
|
|
}
|
|
core_initcall(fsnotify_init);
|