blob: a950b40835776a2b47a784ec703c38ea8ea30145 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*
* Some non-inline ceph helpers
*/
#include "types.h"
/*
* return true if @layout appears to be valid
*/
int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
{
__u32 su = le32_to_cpu(layout->fl_stripe_unit);
__u32 sc = le32_to_cpu(layout->fl_stripe_count);
__u32 os = le32_to_cpu(layout->fl_object_size);
/* stripe unit, object size must be non-zero, 64k increment */
if (!su || (su & (CEPH_MIN_STRIPE_UNIT-1)))
return 0;
if (!os || (os & (CEPH_MIN_STRIPE_UNIT-1)))
return 0;
/* object size must be a multiple of stripe unit */
if (os < su || os % su)
return 0;
/* stripe count must be non-zero */
if (!sc)
return 0;
return 1;
}
int ceph_flags_to_mode(int flags)
{
#ifdef O_DIRECTORY /* fixme */
if ((flags & O_DIRECTORY) == O_DIRECTORY)
return CEPH_FILE_MODE_PIN;
#endif
#ifdef O_LAZY
if (flags & O_LAZY)
return CEPH_FILE_MODE_LAZY;
#endif
if ((flags & O_APPEND) == O_APPEND)
flags |= O_WRONLY;
flags &= O_ACCMODE;
if ((flags & O_RDWR) == O_RDWR)
return CEPH_FILE_MODE_RDWR;
if ((flags & O_WRONLY) == O_WRONLY)
return CEPH_FILE_MODE_WR;
return CEPH_FILE_MODE_RD;
}
int ceph_caps_for_mode(int mode)
{
switch (mode) {
case CEPH_FILE_MODE_PIN:
return CEPH_CAP_PIN;
case CEPH_FILE_MODE_RD:
return CEPH_CAP_PIN | CEPH_CAP_FILE_SHARED |
CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
case CEPH_FILE_MODE_RDWR:
return CEPH_CAP_PIN | CEPH_CAP_FILE_SHARED |
CEPH_CAP_FILE_EXCL |
CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE |
CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
case CEPH_FILE_MODE_WR:
return CEPH_CAP_PIN | CEPH_CAP_FILE_SHARED |
CEPH_CAP_FILE_EXCL |
CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
}
return 0;
}
/* Name hashing routines. Initial hash value */
/* Hash courtesy of the R5 hash in reiserfs modulo sign bits */
#define ceph_init_name_hash() 0
/* partial hash update function. Assume roughly 4 bits per character */
static unsigned long ceph_partial_name_hash(unsigned long c,
unsigned long prevhash)
{
return (prevhash + (c << 4) + (c >> 4)) * 11;
}
/*
* Finally: cut down the number of bits to a int value (and try to avoid
* losing bits)
*/
static unsigned long ceph_end_name_hash(unsigned long hash)
{
return hash & 0xffffffff;
}
/* Compute the hash for a name string. */
unsigned int ceph_full_name_hash(const char *name, unsigned int len)
{
unsigned long hash = ceph_init_name_hash();
while (len--)
hash = ceph_partial_name_hash(*name++, hash);
return ceph_end_name_hash(hash);
}
|
