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authorJan Kara <jack@suse.cz>2014-04-03 14:46:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-03 16:20:51 -0700
commitd507816b58bebc8f9c1bed6a28affaf0729306e2 (patch)
treef82f5977b3a5e3b4e0c1b1f9bbf16b25e5a4c860
parentd8aaab4f619acfbfafc91d94b15c2932457c65fa (diff)
fanotify: move unrelated handling from copy_event_to_user()
Move code moving event structure to access_list from copy_event_to_user() to fanotify_read() where it is more logical (so that we can immediately see in the main loop that we either move the event to a different list or free it). Also move special error handling for permission events from copy_event_to_user() to the main loop to have it in one place with error handling for normal events. This makes copy_event_to_user() really only copy the event to user without any side effects. 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>
-rw-r--r--fs/notify/fanotify/fanotify_user.c40
1 files changed, 19 insertions, 21 deletions
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index f1097f56137e..4e565c814309 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -199,7 +199,7 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
ret = fill_event_metadata(group, &fanotify_event_metadata, event, &f);
if (ret < 0)
- goto out;
+ return ret;
fd = fanotify_event_metadata.fd;
ret = -EFAULT;
@@ -208,16 +208,8 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
goto out_close_fd;
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
- if (event->mask & FAN_ALL_PERM_EVENTS) {
- struct fanotify_perm_event_info *pevent;
-
- pevent = FANOTIFY_PE(event);
- pevent->fd = fd;
- spin_lock(&group->fanotify_data.access_lock);
- list_add_tail(&pevent->fae.fse.list,
- &group->fanotify_data.access_list);
- spin_unlock(&group->fanotify_data.access_lock);
- }
+ if (event->mask & FAN_ALL_PERM_EVENTS)
+ FANOTIFY_PE(event)->fd = fd;
#endif
if (fd != FAN_NOFD)
@@ -229,13 +221,6 @@ out_close_fd:
put_unused_fd(fd);
fput(f);
}
-out:
-#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
- if (event->mask & FAN_ALL_PERM_EVENTS) {
- FANOTIFY_PE(event)->response = FAN_DENY;
- wake_up(&group->fanotify_data.access_waitq);
- }
-#endif
return ret;
}
@@ -300,10 +285,23 @@ static ssize_t fanotify_read(struct file *file, char __user *buf,
* Permission events get queued to wait for response. Other
* events can be destroyed now.
*/
- if (!(kevent->mask & FAN_ALL_PERM_EVENTS))
+ if (!(kevent->mask & FAN_ALL_PERM_EVENTS)) {
fsnotify_destroy_event(group, kevent);
- if (ret < 0)
- break;
+ if (ret < 0)
+ break;
+ } else {
+#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
+ if (ret < 0) {
+ FANOTIFY_PE(kevent)->response = FAN_DENY;
+ wake_up(&group->fanotify_data.access_waitq);
+ break;
+ }
+ spin_lock(&group->fanotify_data.access_lock);
+ list_add_tail(&kevent->list,
+ &group->fanotify_data.access_list);
+ spin_unlock(&group->fanotify_data.access_lock);
+#endif
+ }
buf += ret;
count -= ret;
}