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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 = layout->stripe_unit;
13 __u32 sc = layout->stripe_count;
14 __u32 os = layout->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
30void ceph_file_layout_from_legacy(struct ceph_file_layout *fl,
31 struct ceph_file_layout_legacy *legacy)
32{
33 fl->stripe_unit = le32_to_cpu(legacy->fl_stripe_unit);
34 fl->stripe_count = le32_to_cpu(legacy->fl_stripe_count);
35 fl->object_size = le32_to_cpu(legacy->fl_object_size);
36 fl->pool_id = le32_to_cpu(legacy->fl_pg_pool);
37 if (fl->pool_id == 0 && fl->stripe_unit == 0 &&
38 fl->stripe_count == 0 && fl->object_size == 0)
39 fl->pool_id = -1;
40}
41EXPORT_SYMBOL(ceph_file_layout_from_legacy);
42
43void ceph_file_layout_to_legacy(struct ceph_file_layout *fl,
44 struct ceph_file_layout_legacy *legacy)
45{
46 legacy->fl_stripe_unit = cpu_to_le32(fl->stripe_unit);
47 legacy->fl_stripe_count = cpu_to_le32(fl->stripe_count);
48 legacy->fl_object_size = cpu_to_le32(fl->object_size);
49 if (fl->pool_id >= 0)
50 legacy->fl_pg_pool = cpu_to_le32(fl->pool_id);
51 else
52 legacy->fl_pg_pool = 0;
53}
54EXPORT_SYMBOL(ceph_file_layout_to_legacy);
55
56int ceph_flags_to_mode(int flags)
57{
58 int mode;
59
60#ifdef O_DIRECTORY /* fixme */
61 if ((flags & O_DIRECTORY) == O_DIRECTORY)
62 return CEPH_FILE_MODE_PIN;
63#endif
64
65 switch (flags & O_ACCMODE) {
66 case O_WRONLY:
67 mode = CEPH_FILE_MODE_WR;
68 break;
69 case O_RDONLY:
70 mode = CEPH_FILE_MODE_RD;
71 break;
72 case O_RDWR:
73 case O_ACCMODE: /* this is what the VFS does */
74 mode = CEPH_FILE_MODE_RDWR;
75 break;
76 }
77#ifdef O_LAZY
78 if (flags & O_LAZY)
79 mode |= CEPH_FILE_MODE_LAZY;
80#endif
81
82 return mode;
83}
84EXPORT_SYMBOL(ceph_flags_to_mode);
85
86int ceph_caps_for_mode(int mode)
87{
88 int caps = CEPH_CAP_PIN;
89
90 if (mode & CEPH_FILE_MODE_RD)
91 caps |= CEPH_CAP_FILE_SHARED |
92 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
93 if (mode & CEPH_FILE_MODE_WR)
94 caps |= CEPH_CAP_FILE_EXCL |
95 CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
96 CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
97 CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
98 if (mode & CEPH_FILE_MODE_LAZY)
99 caps |= CEPH_CAP_FILE_LAZYIO;
100
101 return caps;
102}
103EXPORT_SYMBOL(ceph_caps_for_mode);