Btrfs: check for a null fs root when writing to the backup root log
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ceph / ceph_fs.c
blob41466ccb972a6698416d007acf375a81de00b71f
1 /*
2 * Some non-inline ceph helpers
3 */
4 #include <linux/module.h>
5 #include <linux/ceph/types.h>
7 /*
8 * return true if @layout appears to be valid
9 */
10 int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
12 __u32 su = le32_to_cpu(layout->fl_stripe_unit);
13 __u32 sc = le32_to_cpu(layout->fl_stripe_count);
14 __u32 os = le32_to_cpu(layout->fl_object_size);
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;
31 int ceph_flags_to_mode(int flags)
33 int mode;
35 #ifdef O_DIRECTORY /* fixme */
36 if ((flags & O_DIRECTORY) == O_DIRECTORY)
37 return CEPH_FILE_MODE_PIN;
38 #endif
40 switch (flags & O_ACCMODE) {
41 case O_WRONLY:
42 mode = CEPH_FILE_MODE_WR;
43 break;
44 case O_RDONLY:
45 mode = CEPH_FILE_MODE_RD;
46 break;
47 case O_RDWR:
48 case O_ACCMODE: /* this is what the VFS does */
49 mode = CEPH_FILE_MODE_RDWR;
50 break;
52 #ifdef O_LAZY
53 if (flags & O_LAZY)
54 mode |= CEPH_FILE_MODE_LAZY;
55 #endif
57 return mode;
59 EXPORT_SYMBOL(ceph_flags_to_mode);
61 int ceph_caps_for_mode(int mode)
63 int caps = CEPH_CAP_PIN;
65 if (mode & CEPH_FILE_MODE_RD)
66 caps |= CEPH_CAP_FILE_SHARED |
67 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
68 if (mode & CEPH_FILE_MODE_WR)
69 caps |= CEPH_CAP_FILE_EXCL |
70 CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
71 CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
72 CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
73 if (mode & CEPH_FILE_MODE_LAZY)
74 caps |= CEPH_CAP_FILE_LAZYIO;
76 return caps;
78 EXPORT_SYMBOL(ceph_caps_for_mode);