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authorJan Kara <jack@suse.cz>2014-04-03 14:46:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-03 16:20:51 -0700
commitd8aaab4f619acfbfafc91d94b15c2932457c65fa (patch)
treed73ebf86269bf349e2949dfe14dbb2f36f179a59 /fs/notify
parent9573f79355ff3711c98227d14a9b7f4cb3222b97 (diff)
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 <jack@suse.cz> Cc: Eric Paris <eparis@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/notify')
-rw-r--r--fs/notify/fanotify/fanotify_user.c46
1 files 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;
+
+ if (start != buf)
break;
- buf += ret;
- count -= ret;
+ schedule();
continue;
}
- ret = -EAGAIN;
- if (file->f_flags & O_NONBLOCK)
- break;
- ret = -ERESTARTSYS;
- if (signal_pending(current))
- break;
-
- if (start != buf)
+ 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;
-
- schedule();
+ buf += ret;
+ count -= ret;
}
finish_wait(&group->notification_waitq, &wait);