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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>
This commit is contained in:
Jan Kara 2014-04-03 14:46:36 -07:00 committed by Linus Torvalds
parent d8aaab4f61
commit d507816b58
1 changed files with 19 additions and 21 deletions
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40
fs/notify/fanotify/fanotify_user.c
View File

@ -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;
}