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 */
11int 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
31void 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
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}
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}
83
84int 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