diff options
Diffstat (limited to 'fs/notify')
| -rw-r--r-- | fs/notify/fsnotify.h | 6 | ||||
| -rw-r--r-- | fs/notify/group.c | 1 | ||||
| -rw-r--r-- | fs/notify/mark.c | 82 |
3 files changed, 89 insertions, 0 deletions
diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h index 2a92dc06198c..86383c7865c0 100644 --- a/fs/notify/fsnotify.h +++ b/fs/notify/fsnotify.h @@ -8,6 +8,12 @@ #include "../mount.h" +struct fsnotify_iter_info { + struct fsnotify_mark *inode_mark; + struct fsnotify_mark *vfsmount_mark; + int srcu_idx; +}; + /* destroy all events sitting in this groups notification queue */ extern void fsnotify_flush_notify(struct fsnotify_group *group); diff --git a/fs/notify/group.c b/fs/notify/group.c index 0fb4aadcc19f..79439cdf16e0 100644 --- a/fs/notify/group.c +++ b/fs/notify/group.c @@ -126,6 +126,7 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops) /* set to 0 when there a no external references to this group */ atomic_set(&group->refcnt, 1); atomic_set(&group->num_marks, 0); + atomic_set(&group->user_waits, 0); spin_lock_init(&group->notification_lock); INIT_LIST_HEAD(&group->notification_list); diff --git a/fs/notify/mark.c b/fs/notify/mark.c index f916b71c9139..c4f43a6acd9a 100644 --- a/fs/notify/mark.c +++ b/fs/notify/mark.c @@ -109,6 +109,16 @@ void fsnotify_get_mark(struct fsnotify_mark *mark) atomic_inc(&mark->refcnt); } +/* + * Get mark reference when we found the mark via lockless traversal of object + * list. Mark can be already removed from the list by now and on its way to be + * destroyed once SRCU period ends. + */ +static bool fsnotify_get_mark_safe(struct fsnotify_mark *mark) +{ + return atomic_inc_not_zero(&mark->refcnt); +} + static void __fsnotify_recalc_mask(struct fsnotify_mark_connector *conn) { u32 new_mask = 0; @@ -243,6 +253,72 @@ void fsnotify_put_mark(struct fsnotify_mark *mark) FSNOTIFY_REAPER_DELAY); } +bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info) +{ + struct fsnotify_group *group; + + if (WARN_ON_ONCE(!iter_info->inode_mark && !iter_info->vfsmount_mark)) + return false; + + if (iter_info->inode_mark) + group = iter_info->inode_mark->group; + else + group = iter_info->vfsmount_mark->group; + + /* + * Since acquisition of mark reference is an atomic op as well, we can + * be sure this inc is seen before any effect of refcount increment. + */ + atomic_inc(&group->user_waits); + + if (iter_info->inode_mark) { + /* This can fail if mark is being removed */ + if (!fsnotify_get_mark_safe(iter_info->inode_mark)) + goto out_wait; + } + if (iter_info->vfsmount_mark) { + if (!fsnotify_get_mark_safe(iter_info->vfsmount_mark)) + goto out_inode; + } + + /* + * Now that both marks are pinned by refcount in the inode / vfsmount + * lists, we can drop SRCU lock, and safely resume the list iteration + * once userspace returns. + */ + srcu_read_unlock(&fsnotify_mark_srcu, iter_info->srcu_idx); + + return true; +out_inode: + if (iter_info->inode_mark) + fsnotify_put_mark(iter_info->inode_mark); +out_wait: + if (atomic_dec_and_test(&group->user_waits) && group->shutdown) + wake_up(&group->notification_waitq); + return false; +} + +void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info) +{ + struct fsnotify_group *group = NULL; + + iter_info->srcu_idx = srcu_read_lock(&fsnotify_mark_srcu); + if (iter_info->inode_mark) { + group = iter_info->inode_mark->group; + fsnotify_put_mark(iter_info->inode_mark); + } + if (iter_info->vfsmount_mark) { + group = iter_info->vfsmount_mark->group; + fsnotify_put_mark(iter_info->vfsmount_mark); + } + /* + * We abuse notification_waitq on group shutdown for waiting for all + * marks pinned when waiting for userspace. + */ + if (atomic_dec_and_test(&group->user_waits) && group->shutdown) + wake_up(&group->notification_waitq); +} + /* * Mark mark as detached, remove it from group list. Mark still stays in object * list until its last reference is dropped. Note that we rely on mark being @@ -647,6 +723,12 @@ void fsnotify_detach_group_marks(struct fsnotify_group *group) fsnotify_free_mark(mark); fsnotify_put_mark(mark); } + /* + * Some marks can still be pinned when waiting for response from + * userspace. Wait for those now. fsnotify_prepare_user_wait() will + * not succeed now so this wait is race-free. + */ + wait_event(group->notification_waitq, !atomic_read(&group->user_waits)); } /* Destroy all marks attached to inode / vfsmount */ |