sysfs: Support sysfs_notify from atomic context with new sysfs_notify_dirent

Support sysfs_notify from atomic context with new sysfs_notify_dirent

sysfs_notify currently takes sysfs_mutex.
This means that it cannot be called in atomic context.
sysfs_mutex  is sometimes held over a malloc (sysfs_rename_dir)
so it can block on low memory.

In md I want to be able to notify on a sysfs attribute from
atomic context, and I don't want to block on low memory because I
could be in the writeout path for freeing memory.

So:
 - export the "sysfs_dirent" structure along with sysfs_get, sysfs_put
   and sysfs_get_dirent so I can get the sysfs_dirent that I want to
   notify on and hold it in an md structure.
 - split sysfs_notify_dirent out of sysfs_notify so the sysfs_dirent
   can be notified on with no blocking (just a spinlock).

Signed-off-by: Neil Brown <neilb@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 18 insertions, 13 deletions

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index ce8339c70a4b..d0d79e6b6d11 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -453,6 +453,22 @@ static unsigned int sysfs_poll(struct file *filp, poll_table *wait)
         return POLLERR|POLLPRI;
 }
 
+void sysfs_notify_dirent(struct sysfs_dirent *sd)
+{
+        struct sysfs_open_dirent *od;
+
+        spin_lock(&sysfs_open_dirent_lock);
+
+        od = sd->s_attr.open;
+        if (od) {
+                atomic_inc(&od->event);
+                wake_up_interruptible(&od->poll);
+        }
+
+        spin_unlock(&sysfs_open_dirent_lock);
+}
+EXPORT_SYMBOL_GPL(sysfs_notify_dirent);
+
 void sysfs_notify(struct kobject *k, char *dir, char *attr)
 {
         struct sysfs_dirent *sd = k->sd;
@@ -463,19 +479,8 @@ void sysfs_notify(struct kobject *k, char *dir, char *attr)
                 sd = sysfs_find_dirent(sd, dir);
         if (sd && attr)
                 sd = sysfs_find_dirent(sd, attr);
-        if (sd) {
-                struct sysfs_open_dirent *od;
-
-                spin_lock(&sysfs_open_dirent_lock);
-
-                od = sd->s_attr.open;
-                if (od) {
-                        atomic_inc(&od->event);
-                        wake_up_interruptible(&od->poll);
-                }
-
-                spin_unlock(&sysfs_open_dirent_lock);
-        }
+        if (sd)
+                sysfs_notify_dirent(sd);
 
         mutex_unlock(&sysfs_mutex);
 }