projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 11637e4b EP |
1 | #include <linux/fcntl.h> |
| 2 | #include <linux/fs.h> | |
| 52c923dd | 3 | #include <linux/anon_inodes.h> |
| 11637e4b EP |
4 | #include <linux/fsnotify_backend.h> |
| 5 | #include <linux/security.h> | |
| 6 | #include <linux/syscalls.h> | |
| 7 | ||
| 8 | #include "fanotify.h" | |
| 9 | ||
| 52c923dd EP |
10 | static int fanotify_release(struct inode *ignored, struct file *file) |
| 11 | { | |
| 12 | struct fsnotify_group *group = file->private_data; | |
| 13 | ||
| 14 | pr_debug("%s: file=%p group=%p\n", __func__, file, group); | |
| 15 | ||
| 16 | /* matches the fanotify_init->fsnotify_alloc_group */ | |
| 17 | fsnotify_put_group(group); | |
| 18 | ||
| 19 | return 0; | |
| 20 | } | |
| 21 | ||
| 22 | static const struct file_operations fanotify_fops = { | |
| 23 | .poll = NULL, | |
| 24 | .read = NULL, | |
| 25 | .fasync = NULL, | |
| 26 | .release = fanotify_release, | |
| 27 | .unlocked_ioctl = NULL, | |
| 28 | .compat_ioctl = NULL, | |
| 29 | }; | |
| 30 | ||
| 31 | /* fanotify syscalls */ | |
| 11637e4b EP |
32 | SYSCALL_DEFINE3(fanotify_init, unsigned int, flags, unsigned int, event_f_flags, |
| 33 | unsigned int, priority) | |
| 34 | { | |
| 52c923dd EP |
35 | struct fsnotify_group *group; |
| 36 | int f_flags, fd; | |
| 37 | ||
| 38 | pr_debug("%s: flags=%d event_f_flags=%d priority=%d\n", | |
| 39 | __func__, flags, event_f_flags, priority); | |
| 40 | ||
| 41 | if (event_f_flags) | |
| 42 | return -EINVAL; | |
| 43 | if (priority) | |
| 44 | return -EINVAL; | |
| 45 | ||
| 46 | if (!capable(CAP_SYS_ADMIN)) | |
| 47 | return -EACCES; | |
| 48 | ||
| 49 | if (flags & ~FAN_ALL_INIT_FLAGS) | |
| 50 | return -EINVAL; | |
| 51 | ||
| 52 | f_flags = (O_RDONLY | FMODE_NONOTIFY); | |
| 53 | if (flags & FAN_CLOEXEC) | |
| 54 | f_flags |= O_CLOEXEC; | |
| 55 | if (flags & FAN_NONBLOCK) | |
| 56 | f_flags |= O_NONBLOCK; | |
| 57 | ||
| 58 | /* fsnotify_alloc_group takes a ref. Dropped in fanotify_release */ | |
| 59 | group = fsnotify_alloc_group(&fanotify_fsnotify_ops); | |
| 60 | if (IS_ERR(group)) | |
| 61 | return PTR_ERR(group); | |
| 62 | ||
| 63 | fd = anon_inode_getfd("[fanotify]", &fanotify_fops, group, f_flags); | |
| 64 | if (fd < 0) | |
| 65 | goto out_put_group; | |
| 66 | ||
| 67 | return fd; | |
| 68 | ||
| 69 | out_put_group: | |
| 70 | fsnotify_put_group(group); | |
| 71 | return fd; | |
| 11637e4b | 72 | } |
| bbaa4168 EP |
73 | |
| 74 | SYSCALL_DEFINE5(fanotify_mark, int, fanotify_fd, unsigned int, flags, | |
| 75 | __u64, mask, int, dfd, const char __user *, pathname) | |
| 76 | { | |
| 77 | return -ENOSYS; | |
| 78 | } |