Merge branch 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[sfrench/cifs-2.6.git] / net / ceph / ceph_fs.c
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  */
10 int 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
30 void 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 }
41 EXPORT_SYMBOL(ceph_file_layout_from_legacy);
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 EXPORT_SYMBOL(ceph_file_layout_to_legacy);
55
56 int 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 }
84 EXPORT_SYMBOL(ceph_flags_to_mode);
85
86 int 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 }
103 EXPORT_SYMBOL(ceph_caps_for_mode);