1/*
2 * Some non-inline ceph helpers
3 */
4#include <linux/module.h>
5#include <linux/ceph/types.h>
6
7/*
8 * return true if @layout appears to be valid
9 */
10int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
11{
12	__u32 su = le32_to_cpu(layout->fl_stripe_unit);
13	__u32 sc = le32_to_cpu(layout->fl_stripe_count);
14	__u32 os = le32_to_cpu(layout->fl_object_size);
15
16	/* stripe unit, object size must be non-zero, 64k increment */
17	if (!su || (su & (CEPH_MIN_STRIPE_UNIT-1)))
18		return 0;
19	if (!os || (os & (CEPH_MIN_STRIPE_UNIT-1)))
20		return 0;
21	/* object size must be a multiple of stripe unit */
22	if (os < su || os % su)
23		return 0;
24	/* stripe count must be non-zero */
25	if (!sc)
26		return 0;
27	return 1;
28}
29
30
31int ceph_flags_to_mode(int flags)
32{
33	int mode;
34
35#ifdef O_DIRECTORY  /* fixme */
36	if ((flags & O_DIRECTORY) == O_DIRECTORY)
37		return CEPH_FILE_MODE_PIN;
38#endif
39
40	switch (flags & O_ACCMODE) {
41	case O_WRONLY:
42		mode = CEPH_FILE_MODE_WR;
43		break;
44	case O_RDONLY:
45		mode = CEPH_FILE_MODE_RD;
46		break;
47	case O_RDWR:
48	case O_ACCMODE: /* this is what the VFS does */
49		mode = CEPH_FILE_MODE_RDWR;
50		break;
51	}
52#ifdef O_LAZY
53	if (flags & O_LAZY)
54		mode |= CEPH_FILE_MODE_LAZY;
55#endif
56
57	return mode;
58}
59EXPORT_SYMBOL(ceph_flags_to_mode);
60
61int ceph_caps_for_mode(int mode)
62{
63	int caps = CEPH_CAP_PIN;
64
65	if (mode & CEPH_FILE_MODE_RD)
66		caps |= CEPH_CAP_FILE_SHARED |
67			CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
68	if (mode & CEPH_FILE_MODE_WR)
69		caps |= CEPH_CAP_FILE_EXCL |
70			CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
71			CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
72			CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
73	if (mode & CEPH_FILE_MODE_LAZY)
74		caps |= CEPH_CAP_FILE_LAZYIO;
75
76	return caps;
77}
78EXPORT_SYMBOL(ceph_caps_for_mode);
79