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 <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)
38 fl->pool_id = -1;
39}
40EXPORT_SYMBOL(ceph_file_layout_from_legacy);
41
42void ceph_file_layout_to_legacy(struct ceph_file_layout *fl,
43 struct ceph_file_layout_legacy *legacy)
44{
45 legacy->fl_stripe_unit = cpu_to_le32(fl->stripe_unit);
46 legacy->fl_stripe_count = cpu_to_le32(fl->stripe_count);
47 legacy->fl_object_size = cpu_to_le32(fl->object_size);
48 if (fl->pool_id >= 0)
49 legacy->fl_pg_pool = cpu_to_le32(fl->pool_id);
50 else
51 legacy->fl_pg_pool = 0;
52}
53EXPORT_SYMBOL(ceph_file_layout_to_legacy);
54
55int 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}
83EXPORT_SYMBOL(ceph_flags_to_mode);
84
85int ceph_caps_for_mode(int mode)
86{
87 int caps = CEPH_CAP_PIN;
88
89 if (mode & CEPH_FILE_MODE_RD)
90 caps |= CEPH_CAP_FILE_SHARED |
91 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
92 if (mode & CEPH_FILE_MODE_WR)
93 caps |= CEPH_CAP_FILE_EXCL |
94 CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
95 CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
96 CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
97 if (mode & CEPH_FILE_MODE_LAZY)
98 caps |= CEPH_CAP_FILE_LAZYIO;
99
100 return caps;
101}
102EXPORT_SYMBOL(ceph_caps_for_mode);