From d911d98748018f7c8facc035ba39c30f5cce6f9c Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Wed, 9 Apr 2014 11:07:31 -0400 Subject: [PATCH] kernfs: make kernfs_notify() trigger inotify events too kernfs_notify() is used to indicate either new data is available or the content of a file has changed. It currently only triggers poll which may not be the most convenient to monitor especially when there are a lot to monitor. Let's hook it up to fsnotify too so that the events can be monitored via inotify too. fsnotify_modify() requires file * but kernfs_notify() doesn't have any specific file associated; however, we can walk all super_blocks associated with a kernfs_root and as kernfs always associate one ino with inode and one dentry with an inode, it's trivial to look up the dentry associated with a given kernfs_node. As any active monitor would pin dentry, just looking up existing dentry is enough. This patch looks up the dentry associated with the specified kernfs_node and generates events equivalent to fsnotify_modify(). Note that as fsnotify doesn't provide fsnotify_modify() equivalent which can be called with dentry, kernfs_notify() directly calls fsnotify_parent() and fsnotify(). It might be better to add a wrapper in fsnotify.h instead. Signed-off-by: Tejun Heo Cc: John McCutchan Cc: Robert Love Cc: Eric Paris Signed-off-by: Greg Kroah-Hartman --- fs/kernfs/file.c | 41 +++++++++++++++++++++++++++++++++++------ 1 file changed, 35 insertions(+), 6 deletions(-) diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c index 8034706a7af8..98bacd9ea7fd 100644 --- a/fs/kernfs/file.c +++ b/fs/kernfs/file.c @@ -14,6 +14,7 @@ #include #include #include +#include #include "kernfs-internal.h" @@ -785,20 +786,48 @@ static unsigned int kernfs_fop_poll(struct file *filp, poll_table *wait) */ void kernfs_notify(struct kernfs_node *kn) { + struct kernfs_root *root = kernfs_root(kn); struct kernfs_open_node *on; + struct kernfs_super_info *info; unsigned long flags; + if (WARN_ON(kernfs_type(kn) != KERNFS_FILE)) + return; + + /* kick poll */ spin_lock_irqsave(&kernfs_open_node_lock, flags); - if (!WARN_ON(kernfs_type(kn) != KERNFS_FILE)) { - on = kn->attr.open; - if (on) { - atomic_inc(&on->event); - wake_up_interruptible(&on->poll); - } + on = kn->attr.open; + if (on) { + atomic_inc(&on->event); + wake_up_interruptible(&on->poll); } spin_unlock_irqrestore(&kernfs_open_node_lock, flags); + + /* kick fsnotify */ + mutex_lock(&kernfs_mutex); + + list_for_each_entry(info, &root->supers, node) { + struct inode *inode; + struct dentry *dentry; + + inode = ilookup(info->sb, kn->ino); + if (!inode) + continue; + + dentry = d_find_any_alias(inode); + if (dentry) { + fsnotify_parent(NULL, dentry, FS_MODIFY); + fsnotify(inode, FS_MODIFY, inode, FSNOTIFY_EVENT_INODE, + NULL, 0); + dput(dentry); + } + + iput(inode); + } + + mutex_unlock(&kernfs_mutex); } EXPORT_SYMBOL_GPL(kernfs_notify);