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