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fsnotify: use a mutex instead of a spinlock to protect a groups mark list 

Replaces the groups mark_lock spinlock with a mutex. Using a mutex instead
of a spinlock results in more flexibility (i.e it allows to sleep while the
lock is held).

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Lino Sanfilippo 2011-06-14 17:29:50 +02:00 committed by Eric Paris
parent 6dfbd14994
commit 986ab09807
5 changed files with 15 additions and 15 deletions
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2
fs/notify/group.c
View File

@ -95,7 +95,7 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops)
init_waitqueue_head(&group->notification_waitq); init_waitqueue_head(&group->notification_waitq);
group->max_events = UINT_MAX; group->max_events = UINT_MAX;
spin_lock_init(&group->mark_lock); mutex_init(&group->mark_mutex);
INIT_LIST_HEAD(&group->marks_list); INIT_LIST_HEAD(&group->marks_list);
group->ops = ops; group->ops = ops;

4
fs/notify/inode_mark.c
View File

@ -63,8 +63,8 @@ void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
{ {
struct inode *inode = mark->i.inode; struct inode *inode = mark->i.inode;
BUG_ON(!mutex_is_locked(&mark->group->mark_mutex));
assert_spin_locked(&mark->lock); assert_spin_locked(&mark->lock);
assert_spin_locked(&mark->group->mark_lock);
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);
@ -191,8 +191,8 @@ int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
mark->flags |= FSNOTIFY_MARK_FLAG_INODE; mark->flags |= FSNOTIFY_MARK_FLAG_INODE;
BUG_ON(!mutex_is_locked(&group->mark_mutex));
assert_spin_locked(&mark->lock); assert_spin_locked(&mark->lock);
assert_spin_locked(&group->mark_lock);
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);

18
fs/notify/mark.c
View File

@ -136,13 +136,13 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark)
group = mark->group; group = mark->group;
spin_unlock(&mark->lock); spin_unlock(&mark->lock);
spin_lock(&group->mark_lock); mutex_lock(&group->mark_mutex);
spin_lock(&mark->lock); spin_lock(&mark->lock);
/* something else already called this function on this mark */ /* something else already called this function on this mark */
if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE)) { if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE)) {
spin_unlock(&mark->lock); spin_unlock(&mark->lock);
spin_unlock(&group->mark_lock); mutex_unlock(&group->mark_mutex);
goto put_group; goto put_group;
} }
@ -159,7 +159,7 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark)
list_del_init(&mark->g_list); list_del_init(&mark->g_list);
spin_unlock(&mark->lock); spin_unlock(&mark->lock);
spin_unlock(&group->mark_lock); mutex_unlock(&group->mark_mutex);
spin_lock(&destroy_lock); spin_lock(&destroy_lock);
list_add(&mark->destroy_list, &destroy_list); list_add(&mark->destroy_list, &destroy_list);
@ -232,11 +232,11 @@ int fsnotify_add_mark(struct fsnotify_mark *mark,
/* /*
* LOCKING ORDER!!!! * LOCKING ORDER!!!!
* group->mark_lock * group->mark_mutex
* mark->lock * mark->lock
* inode->i_lock * inode->i_lock
*/ */
spin_lock(&group->mark_lock); mutex_lock(&group->mark_mutex);
spin_lock(&mark->lock); spin_lock(&mark->lock);
mark->flags |= FSNOTIFY_MARK_FLAG_ALIVE; mark->flags |= FSNOTIFY_MARK_FLAG_ALIVE;
@ -263,7 +263,7 @@ int fsnotify_add_mark(struct fsnotify_mark *mark,
fsnotify_set_mark_mask_locked(mark, mark->mask); fsnotify_set_mark_mask_locked(mark, mark->mask);
spin_unlock(&mark->lock); spin_unlock(&mark->lock);
spin_unlock(&group->mark_lock); mutex_unlock(&group->mark_mutex);
if (inode) if (inode)
__fsnotify_update_child_dentry_flags(inode); __fsnotify_update_child_dentry_flags(inode);
@ -277,7 +277,7 @@ err:
atomic_dec(&group->num_marks); atomic_dec(&group->num_marks);
spin_unlock(&mark->lock); spin_unlock(&mark->lock);
spin_unlock(&group->mark_lock); mutex_unlock(&group->mark_mutex);
spin_lock(&destroy_lock); spin_lock(&destroy_lock);
list_add(&mark->destroy_list, &destroy_list); list_add(&mark->destroy_list, &destroy_list);
@ -296,7 +296,7 @@ void fsnotify_clear_marks_by_group_flags(struct fsnotify_group *group,
struct fsnotify_mark *lmark, *mark; struct fsnotify_mark *lmark, *mark;
LIST_HEAD(free_list); LIST_HEAD(free_list);
spin_lock(&group->mark_lock); mutex_lock(&group->mark_mutex);
list_for_each_entry_safe(mark, lmark, &group->marks_list, g_list) { list_for_each_entry_safe(mark, lmark, &group->marks_list, g_list) {
if (mark->flags & flags) { if (mark->flags & flags) {
list_add(&mark->free_g_list, &free_list); list_add(&mark->free_g_list, &free_list);
@ -304,7 +304,7 @@ void fsnotify_clear_marks_by_group_flags(struct fsnotify_group *group,
fsnotify_get_mark(mark); fsnotify_get_mark(mark);
} }
} }
spin_unlock(&group->mark_lock); mutex_unlock(&group->mark_mutex);
list_for_each_entry_safe(mark, lmark, &free_list, free_g_list) { list_for_each_entry_safe(mark, lmark, &free_list, free_g_list) {
fsnotify_destroy_mark(mark); fsnotify_destroy_mark(mark);

4
fs/notify/vfsmount_mark.c
View File

@ -88,8 +88,8 @@ void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark)
{ {
struct vfsmount *mnt = mark->m.mnt; struct vfsmount *mnt = mark->m.mnt;
BUG_ON(!mutex_is_locked(&mark->group->mark_mutex));
assert_spin_locked(&mark->lock); assert_spin_locked(&mark->lock);
assert_spin_locked(&mark->group->mark_lock);
spin_lock(&mnt->mnt_root->d_lock); spin_lock(&mnt->mnt_root->d_lock);
@ -151,8 +151,8 @@ int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
mark->flags |= FSNOTIFY_MARK_FLAG_VFSMOUNT; mark->flags |= FSNOTIFY_MARK_FLAG_VFSMOUNT;
BUG_ON(!mutex_is_locked(&group->mark_mutex));
assert_spin_locked(&mark->lock); assert_spin_locked(&mark->lock);
assert_spin_locked(&group->mark_lock);
spin_lock(&mnt->mnt_root->d_lock); spin_lock(&mnt->mnt_root->d_lock);

2
include/linux/fsnotify_backend.h
View File

@ -141,7 +141,7 @@ struct fsnotify_group {
unsigned int priority; unsigned int priority;
/* stores all fastpath marks assoc with this group so they can be cleaned on unregister */ /* stores all fastpath marks assoc with this group so they can be cleaned on unregister */
spinlock_t mark_lock; /* protect marks_list */ struct mutex mark_mutex; /* protect marks_list */
atomic_t num_marks; /* 1 for each mark and 1 for not being atomic_t num_marks; /* 1 for each mark and 1 for not being
* past the point of no return when freeing * past the point of no return when freeing
* a group */ * a group */