1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Some non-inline ceph helpers
4 */
5 #include <linux/module.h>
6 #include <linux/ceph/types.h>
7
8 /*
9 * return true if @layout appears to be valid
10 */
11 int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
12 {
13 __u32 su = layout->stripe_unit;
14 __u32 sc = layout->stripe_count;
15 __u32 os = layout->object_size;
16
17 /* stripe unit, object size must be non-zero, 64k increment */
18 if (!su || (su & (CEPH_MIN_STRIPE_UNIT-1)))
19 return 0;
20 if (!os || (os & (CEPH_MIN_STRIPE_UNIT-1)))
21 return 0;
22 /* object size must be a multiple of stripe unit */
23 if (os < su || os % su)
24 return 0;
25 /* stripe count must be non-zero */
26 if (!sc)
27 return 0;
28 return 1;
29 }
30
31 void ceph_file_layout_from_legacy(struct ceph_file_layout *fl,
32 struct ceph_file_layout_legacy *legacy)
33 {
34 fl->stripe_unit = le32_to_cpu(legacy->fl_stripe_unit);
35 fl->stripe_count = le32_to_cpu(legacy->fl_stripe_count);
36 fl->object_size = le32_to_cpu(legacy->fl_object_size);
37 fl->pool_id = le32_to_cpu(legacy->fl_pg_pool);
38 if (fl->pool_id == 0 && fl->stripe_unit == 0 &&
39 fl->stripe_count == 0 && fl->object_size == 0)
40 fl->pool_id = -1;
41 }
42
43 void 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 }
54
55 int ceph_flags_to_mode(int flags)
56 {
57 int mode;
58
59 #ifdef O_DIRECTORY /* fixme */
60 if ((flags & O_DIRECTORY) == O_DIRECTORY)
61 return CEPH_FILE_MODE_PIN;
62 #endif
63
64 switch (flags & O_ACCMODE) {
65 case O_WRONLY:
66 mode = CEPH_FILE_MODE_WR;
67 break;
68 case O_RDONLY:
69 mode = CEPH_FILE_MODE_RD;
70 break;
71 case O_RDWR:
72 case O_ACCMODE: /* this is what the VFS does */
73 mode = CEPH_FILE_MODE_RDWR;
74 break;
75 }
76 #ifdef O_LAZY
77 if (flags & O_LAZY)
78 mode |= CEPH_FILE_MODE_LAZY;
79 #endif
80
81 return mode;
82 }
83
84 int ceph_caps_for_mode(int mode)
85 {
86 int caps = CEPH_CAP_PIN;
87
88 if (mode & CEPH_FILE_MODE_RD)
89 caps |= CEPH_CAP_FILE_SHARED |
90 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
91 if (mode & CEPH_FILE_MODE_WR)
92 caps |= CEPH_CAP_FILE_EXCL |
93 CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
94 CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
95 CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
96 if (mode & CEPH_FILE_MODE_LAZY)
97 caps |= CEPH_CAP_FILE_LAZYIO;
98
99 return caps;
100 }
101
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.