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  */
ceph_file_layout_is_valid(const struct ceph_file_layout * layout)10 int 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 
ceph_flags_to_mode(int flags)31 int 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 	if ((flags & O_APPEND) == O_APPEND)
40 		flags |= O_WRONLY;
41 
42 	if ((flags & O_ACCMODE) == O_RDWR)
43 		mode = CEPH_FILE_MODE_RDWR;
44 	else if ((flags & O_ACCMODE) == O_WRONLY)
45 		mode = CEPH_FILE_MODE_WR;
46 	else
47 		mode = CEPH_FILE_MODE_RD;
48 
49 #ifdef O_LAZY
50 	if (flags & O_LAZY)
51 		mode |= CEPH_FILE_MODE_LAZY;
52 #endif
53 
54 	return mode;
55 }
56 EXPORT_SYMBOL(ceph_flags_to_mode);
57 
ceph_caps_for_mode(int mode)58 int ceph_caps_for_mode(int mode)
59 {
60 	int caps = CEPH_CAP_PIN;
61 
62 	if (mode & CEPH_FILE_MODE_RD)
63 		caps |= CEPH_CAP_FILE_SHARED |
64 			CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
65 	if (mode & CEPH_FILE_MODE_WR)
66 		caps |= CEPH_CAP_FILE_EXCL |
67 			CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
68 			CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
69 			CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
70 	if (mode & CEPH_FILE_MODE_LAZY)
71 		caps |= CEPH_CAP_FILE_LAZYIO;
72 
73 	return caps;
74 }
75 EXPORT_SYMBOL(ceph_caps_for_mode);
76