From d8aaab4f619acfbfafc91d94b15c2932457c65fa Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Thu, 3 Apr 2014 14:46:35 -0700 Subject: [PATCH] fanotify: reorganize loop in fanotify_read() Swap the error / "read ok" branches in the main loop of fanotify_read(). We will grow the "read ok" part in the next patch and this makes the indentation easier. Also it is more common to have error conditions inside an 'if' instead of the fast path. Signed-off-by: Jan Kara Cc: Eric Paris Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/notify/fanotify/fanotify_user.c | 46 ++++++++++++++++-------------- 1 file changed, 24 insertions(+), 22 deletions(-) diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c index 2a57278afb80..f1097f56137e 100644 --- a/fs/notify/fanotify/fanotify_user.c +++ b/fs/notify/fanotify/fanotify_user.c @@ -275,35 +275,37 @@ static ssize_t fanotify_read(struct file *file, char __user *buf, kevent = get_one_event(group, count); mutex_unlock(&group->notification_mutex); - if (kevent) { + if (IS_ERR(kevent)) { ret = PTR_ERR(kevent); - if (IS_ERR(kevent)) + break; + } + + if (!kevent) { + ret = -EAGAIN; + if (file->f_flags & O_NONBLOCK) break; - ret = copy_event_to_user(group, kevent, buf); - /* - * Permission events get queued to wait for response. - * Other events can be destroyed now. - */ - if (!(kevent->mask & FAN_ALL_PERM_EVENTS)) - fsnotify_destroy_event(group, kevent); - if (ret < 0) + + ret = -ERESTARTSYS; + if (signal_pending(current)) break; - buf += ret; - count -= ret; + + if (start != buf) + break; + schedule(); continue; } - ret = -EAGAIN; - if (file->f_flags & O_NONBLOCK) + ret = copy_event_to_user(group, kevent, buf); + /* + * Permission events get queued to wait for response. Other + * events can be destroyed now. + */ + if (!(kevent->mask & FAN_ALL_PERM_EVENTS)) + fsnotify_destroy_event(group, kevent); + if (ret < 0) break; - ret = -ERESTARTSYS; - if (signal_pending(current)) - break; - - if (start != buf) - break; - - schedule(); + buf += ret; + count -= ret; } finish_wait(&group->notification_waitq, &wait);