The patch titled
Subject: fsnotify: convert notification_mutex to a spinlock
has been added to the -mm tree. Its filename is
fsnotify-convert-notification_mutex-to-a-spinlock.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fsnotify-convert-notification_mutex-to-a-spinlock.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fsnotify-convert-notification_mutex-to-a-spinlock.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Jan Kara <jack@xxxxxxx>
Subject: fsnotify: convert notification_mutex to a spinlock
notification_mutex is used to protect the list of pending events. As such
there's no reason to use a sleeping lock for it. Convert it to a
spinlock.
Link: http://lkml.kernel.org/r/1473797711-14111-5-git-send-email-jack@xxxxxxx
Signed-off-by: Jan Kara <jack@xxxxxxx>
Cc: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Cc: Lino Sanfilippo <LinoSanfilippo@xxxxxx>
Cc: Eric Paris <eparis@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/notify/fanotify/fanotify_user.c | 26 +++++++++++++-------------
fs/notify/group.c | 6 +++---
fs/notify/inotify/inotify_user.c | 16 ++++++++--------
fs/notify/notification.c | 24 ++++++++++++------------
include/linux/fsnotify_backend.h | 2 +-
5 files changed, 37 insertions(+), 37 deletions(-)
diff -puN fs/notify/fanotify/fanotify_user.c~fsnotify-convert-notification_mutex-to-a-spinlock fs/notify/fanotify/fanotify_user.c
--- a/fs/notify/fanotify/fanotify_user.c~fsnotify-convert-notification_mutex-to-a-spinlock
+++ a/fs/notify/fanotify/fanotify_user.c
@@ -49,12 +49,12 @@ struct kmem_cache *fanotify_perm_event_c
* enough to fit in "count". Return an error pointer if the count
* is not large enough.
*
- * Called with the group->notification_mutex held.
+ * Called with the group->notification_lock held.
*/
static struct fsnotify_event *get_one_event(struct fsnotify_group *group,
size_t count)
{
- BUG_ON(!mutex_is_locked(&group->notification_mutex));
+ BUG_ON(!spin_is_locked(&group->notification_lock));
pr_debug("%s: group=%p count=%zd\n", __func__, group, count);
@@ -64,7 +64,7 @@ static struct fsnotify_event *get_one_ev
if (FAN_EVENT_METADATA_LEN > count)
return ERR_PTR(-EINVAL);
- /* held the notification_mutex the whole time, so this is the
+ /* held the notification_lock the whole time, so this is the
* same event we peeked above */
return fsnotify_remove_first_event(group);
}
@@ -244,10 +244,10 @@ static unsigned int fanotify_poll(struct
int ret = 0;
poll_wait(file, &group->notification_waitq, wait);
- mutex_lock(&group->notification_mutex);
+ spin_lock(&group->notification_lock);
if (!fsnotify_notify_queue_is_empty(group))
ret = POLLIN | POLLRDNORM;
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
return ret;
}
@@ -268,9 +268,9 @@ static ssize_t fanotify_read(struct file
add_wait_queue(&group->notification_waitq, &wait);
while (1) {
- mutex_lock(&group->notification_mutex);
+ spin_lock(&group->notification_lock);
kevent = get_one_event(group, count);
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
if (IS_ERR(kevent)) {
ret = PTR_ERR(kevent);
@@ -387,17 +387,17 @@ static int fanotify_release(struct inode
* dequeue them and set the response. They will be freed once the
* response is consumed and fanotify_get_response() returns.
*/
- mutex_lock(&group->notification_mutex);
+ spin_lock(&group->notification_lock);
while (!fsnotify_notify_queue_is_empty(group)) {
fsn_event = fsnotify_remove_first_event(group);
if (!(fsn_event->mask & FAN_ALL_PERM_EVENTS)) {
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
fsnotify_destroy_event(group, fsn_event);
- mutex_lock(&group->notification_mutex);
+ spin_lock(&group->notification_lock);
} else
FANOTIFY_PE(fsn_event)->response = FAN_ALLOW;
}
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
/* Response for all permission events it set, wakeup waiters */
wake_up(&group->fanotify_data.access_waitq);
@@ -423,10 +423,10 @@ static long fanotify_ioctl(struct file *
switch (cmd) {
case FIONREAD:
- mutex_lock(&group->notification_mutex);
+ spin_lock(&group->notification_lock);
list_for_each_entry(fsn_event, &group->notification_list, list)
send_len += FAN_EVENT_METADATA_LEN;
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
ret = put_user(send_len, (int __user *) p);
break;
}
diff -puN fs/notify/group.c~fsnotify-convert-notification_mutex-to-a-spinlock fs/notify/group.c
--- a/fs/notify/group.c~fsnotify-convert-notification_mutex-to-a-spinlock
+++ a/fs/notify/group.c
@@ -45,9 +45,9 @@ static void fsnotify_final_destroy_group
*/
void fsnotify_group_stop_queueing(struct fsnotify_group *group)
{
- mutex_lock(&group->notification_mutex);
+ spin_lock(&group->notification_lock);
group->shutdown = true;
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
}
/*
@@ -125,7 +125,7 @@ struct fsnotify_group *fsnotify_alloc_gr
atomic_set(&group->refcnt, 1);
atomic_set(&group->num_marks, 0);
- mutex_init(&group->notification_mutex);
+ spin_lock_init(&group->notification_lock);
INIT_LIST_HEAD(&group->notification_list);
init_waitqueue_head(&group->notification_waitq);
group->max_events = UINT_MAX;
diff -puN fs/notify/inotify/inotify_user.c~fsnotify-convert-notification_mutex-to-a-spinlock fs/notify/inotify/inotify_user.c
--- a/fs/notify/inotify/inotify_user.c~fsnotify-convert-notification_mutex-to-a-spinlock
+++ a/fs/notify/inotify/inotify_user.c
@@ -115,10 +115,10 @@ static unsigned int inotify_poll(struct
int ret = 0;
poll_wait(file, &group->notification_waitq, wait);
- mutex_lock(&group->notification_mutex);
+ spin_lock(&group->notification_lock);
if (!fsnotify_notify_queue_is_empty(group))
ret = POLLIN | POLLRDNORM;
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
return ret;
}
@@ -138,7 +138,7 @@ static int round_event_name_len(struct f
* enough to fit in "count". Return an error pointer if
* not large enough.
*
- * Called with the group->notification_mutex held.
+ * Called with the group->notification_lock held.
*/
static struct fsnotify_event *get_one_event(struct fsnotify_group *group,
size_t count)
@@ -157,7 +157,7 @@ static struct fsnotify_event *get_one_ev
if (event_size > count)
return ERR_PTR(-EINVAL);
- /* held the notification_mutex the whole time, so this is the
+ /* held the notification_lock the whole time, so this is the
* same event we peeked above */
fsnotify_remove_first_event(group);
@@ -234,9 +234,9 @@ static ssize_t inotify_read(struct file
add_wait_queue(&group->notification_waitq, &wait);
while (1) {
- mutex_lock(&group->notification_mutex);
+ spin_lock(&group->notification_lock);
kevent = get_one_event(group, count);
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
pr_debug("%s: group=%p kevent=%p\n", __func__, group, kevent);
@@ -300,13 +300,13 @@ static long inotify_ioctl(struct file *f
switch (cmd) {
case FIONREAD:
- mutex_lock(&group->notification_mutex);
+ spin_lock(&group->notification_lock);
list_for_each_entry(fsn_event, &group->notification_list,
list) {
send_len += sizeof(struct inotify_event);
send_len += round_event_name_len(fsn_event);
}
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
ret = put_user(send_len, (int __user *) p);
break;
}
diff -puN fs/notify/notification.c~fsnotify-convert-notification_mutex-to-a-spinlock fs/notify/notification.c
--- a/fs/notify/notification.c~fsnotify-convert-notification_mutex-to-a-spinlock
+++ a/fs/notify/notification.c
@@ -63,7 +63,7 @@ EXPORT_SYMBOL_GPL(fsnotify_get_cookie);
/* return true if the notify queue is empty, false otherwise */
bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group)
{
- BUG_ON(!mutex_is_locked(&group->notification_mutex));
+ BUG_ON(!spin_is_locked(&group->notification_lock));
return list_empty(&group->notification_list) ? true : false;
}
@@ -95,10 +95,10 @@ int fsnotify_add_event(struct fsnotify_g
pr_debug("%s: group=%p event=%p\n", __func__, group, event);
- mutex_lock(&group->notification_mutex);
+ spin_lock(&group->notification_lock);
if (group->shutdown) {
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
return 2;
}
@@ -106,7 +106,7 @@ int fsnotify_add_event(struct fsnotify_g
ret = 2;
/* Queue overflow event only if it isn't already queued */
if (!list_empty(&group->overflow_event->list)) {
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
return ret;
}
event = group->overflow_event;
@@ -116,7 +116,7 @@ int fsnotify_add_event(struct fsnotify_g
if (!list_empty(list) && merge) {
ret = merge(list, event);
if (ret) {
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
return ret;
}
}
@@ -124,7 +124,7 @@ int fsnotify_add_event(struct fsnotify_g
queue:
group->q_len++;
list_add_tail(&event->list, list);
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
wake_up(&group->notification_waitq);
kill_fasync(&group->fsn_fa, SIGIO, POLL_IN);
@@ -139,7 +139,7 @@ struct fsnotify_event *fsnotify_remove_f
{
struct fsnotify_event *event;
- BUG_ON(!mutex_is_locked(&group->notification_mutex));
+ BUG_ON(!spin_is_locked(&group->notification_lock));
pr_debug("%s: group=%p\n", __func__, group);
@@ -161,7 +161,7 @@ struct fsnotify_event *fsnotify_remove_f
*/
struct fsnotify_event *fsnotify_peek_first_event(struct fsnotify_group *group)
{
- BUG_ON(!mutex_is_locked(&group->notification_mutex));
+ BUG_ON(!spin_is_locked(&group->notification_lock));
return list_first_entry(&group->notification_list,
struct fsnotify_event, list);
@@ -175,14 +175,14 @@ void fsnotify_flush_notify(struct fsnoti
{
struct fsnotify_event *event;
- mutex_lock(&group->notification_mutex);
+ spin_lock(&group->notification_lock);
while (!fsnotify_notify_queue_is_empty(group)) {
event = fsnotify_remove_first_event(group);
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
fsnotify_destroy_event(group, event);
- mutex_lock(&group->notification_mutex);
+ spin_lock(&group->notification_lock);
}
- mutex_unlock(&group->notification_mutex);
+ spin_unlock(&group->notification_lock);
}
/*
diff -puN include/linux/fsnotify_backend.h~fsnotify-convert-notification_mutex-to-a-spinlock include/linux/fsnotify_backend.h
--- a/include/linux/fsnotify_backend.h~fsnotify-convert-notification_mutex-to-a-spinlock
+++ a/include/linux/fsnotify_backend.h
@@ -135,7 +135,7 @@ struct fsnotify_group {
const struct fsnotify_ops *ops; /* how this group handles things */
/* needed to send notification to userspace */
- struct mutex notification_mutex; /* protect the notification_list */
+ spinlock_t notification_lock; /* protect the notification_list */
struct list_head notification_list; /* list of event_holder this group needs to send to userspace */
wait_queue_head_t notification_waitq; /* read() on the notification file blocks on this waitq */
unsigned int q_len; /* events on the queue */
_
Patches currently in -mm which might be from jack@xxxxxxx are
fsnotify-add-a-way-to-stop-queueing-events-on-group-shutdown.patch
fanotify-fix-list-corruption-in-fanotify_get_response.patch
fsnotify-drop-notification_mutex-before-destroying-event.patch
fsnotify-convert-notification_mutex-to-a-spinlock.patch
fanotify-use-notification_lock-instead-of-access_lock.patch
fanotify-fix-possible-false-warning-when-freeing-events.patch
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