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authorTejun Heo <tj@kernel.org>2014-04-09 11:07:31 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-04-25 11:43:31 -0700
commitd911d98748018f7c8facc035ba39c30f5cce6f9c (patch)
tree01bd2fd6dac3eddc47f6c0d119c2ffdcaa6b5fef /kernel/ksysfs.c
parent7d568a8383bbb9c1f5167781075906acb2bb1550 (diff)
downloadlinux-sh-d911d98748018f7c8facc035ba39c30f5cce6f9c.tar.gz
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 <tj@kernel.org> Cc: John McCutchan <john@johnmccutchan.com> Cc: Robert Love <rlove@rlove.org> Cc: Eric Paris <eparis@parisplace.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/ksysfs.c')
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