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Commit 84a5b68e authored by Eric Paris's avatar Eric Paris
Browse files

fsnotify: rework ignored mark flushing 



currently ignored_mark clearing is done in a seperate list traversal
before the actual list traversal to send events.  There is no need for
this.  Do them at the same time.

Signed-off-by: default avatarEric Paris <eparis@redhat.com>
parent 02436668

fs/notify/fsnotify.c

+11 −49
Original line number Diff line number Diff line
@@ -140,36 +140,6 @@ void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask) 
}

EXPORT_SYMBOL_GPL(__fsnotify_parent);



void __fsnotify_flush_ignored_mask(struct inode *inode, void *data, int data_is)

{

	struct fsnotify_mark *mark;

	struct hlist_node *node;

	int idx;



	idx = srcu_read_lock(&fsnotify_mark_srcu);



	if (!hlist_empty(&inode->i_fsnotify_marks)) {

		hlist_for_each_entry_rcu(mark, node, &inode->i_fsnotify_marks, i.i_list) {

			if (!(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))

				mark->ignored_mask = 0;

		}

	}



	if (data_is == FSNOTIFY_EVENT_FILE) {

		struct vfsmount *mnt;



		mnt = ((struct file *)data)->f_path.mnt;

		if (mnt && !hlist_empty(&mnt->mnt_fsnotify_marks)) {

			hlist_for_each_entry_rcu(mark, node, &mnt->mnt_fsnotify_marks, m.m_list) {

				if (!(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))

					mark->ignored_mask = 0;

			}

		}

	}



	srcu_read_unlock(&fsnotify_mark_srcu, idx);

}



static int send_to_group(struct fsnotify_group *group, struct inode *to_tell,

			 struct vfsmount *mnt, struct fsnotify_mark *mark,

			 __u32 mask, void *data, int data_is, u32 cookie,
@@ -193,14 +163,6 @@ static int send_to_group(struct fsnotify_group *group, struct inode *to_tell, 
	return group->ops->handle_event(group, mark, *event);

}



static bool needed_by_vfsmount(__u32 test_mask, struct vfsmount *mnt)

{

	if (!mnt)

		return false;



	return (test_mask & mnt->mnt_fsnotify_mask);

}



/*

 * This is the main call to fsnotify.  The VFS calls into hook specific functions

 * in linux/fsnotify.h.  Those functions then in turn call here.  Here will call
@@ -219,26 +181,21 @@ int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, 
	/* global tests shouldn't care about events on child only the specific event */

	__u32 test_mask = (mask & ~FS_EVENT_ON_CHILD);



	if (mask & FS_MODIFY)

		__fsnotify_flush_ignored_mask(to_tell, data, data_is);



	if (data_is == FSNOTIFY_EVENT_FILE)

		mnt = ((struct file *)data)->f_path.mnt;



	/* if this inode's directed listeners don't care and nothing on the vfsmount

	 * listeners list cares, nothing to do */

	if (!(test_mask & to_tell->i_fsnotify_mask) &&

	    !needed_by_vfsmount(test_mask, mnt))

		return 0;



	idx = srcu_read_lock(&fsnotify_mark_srcu);



	if (test_mask & to_tell->i_fsnotify_mask) {

	if ((test_mask & to_tell->i_fsnotify_mask) || (mask & FS_MODIFY)) {

		hlist_for_each_entry_rcu(mark, node, &to_tell->i_fsnotify_marks, i.i_list) {



			pr_debug("%s: inode_loop: mark=%p mark->mask=%x mark->ignored_mask=%x\n",

				 __func__, mark, mark->mask, mark->ignored_mask);



			if ((mask & FS_MODIFY) &&

			    !(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))

				mark->ignored_mask = 0;



			if (test_mask & mark->mask & ~mark->ignored_mask) {

				group = mark->group;

				if (!group)
@@ -252,12 +209,17 @@ int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, 
		}

	}



	if (mnt && (test_mask & mnt->mnt_fsnotify_mask)) {

	if (mnt && ((test_mask & mnt->mnt_fsnotify_mask) ||

		    (mask & FS_MODIFY))) {

		hlist_for_each_entry_rcu(mark, node, &mnt->mnt_fsnotify_marks, m.m_list) {



			pr_debug("%s: mnt_loop: mark=%p mark->mask=%x mark->ignored_mask=%x\n",

				 __func__, mark, mark->mask, mark->ignored_mask);



			if ((mask & FS_MODIFY) &&

			    !(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))

				mark->ignored_mask = 0;



			if (test_mask & mark->mask & ~mark->ignored_mask)  {

				group = mark->group;

				if (!group)