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fanotify: permissions and blocking

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This is the backend work needed for fanotify to support the new
FS_OPEN_PERM and FS_ACCESS_PERM fsnotify events.  This is done using the
new fsnotify secondary queue.  No userspace interface is provided actually
respond to or request these events.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris
2009-12-17 21:24:34 -05:00
parent c4ec54b40d
commit 9e66e4233d
5 changed files with 99 additions and 4 deletions
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12
include/linux/fsnotify_backend.h
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@ -159,6 +159,14 @@ struct fsnotify_group {
struct fasync_struct *fa; /* async notification */
struct user_struct *user;
} inotify_data;
#endif
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
struct fanotify_group_private_data {
/* allows a group to block waiting for a userspace response */
struct mutex access_mutex;
struct list_head access_list;
wait_queue_head_t access_waitq;
} fanotify_data;
#endif
};
};
@ -227,6 +235,10 @@ struct fsnotify_event {
size_t name_len;
struct pid *tgid;
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
__u32 response; /* userspace answer to question */
#endif /* CONFIG_FANOTIFY_ACCESS_PERMISSIONS */
struct list_head private_data_list; /* groups can store private data here */
};