| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 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 | */ |
| 11 | int 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 | |
| 31 | void 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 | EXPORT_SYMBOL(ceph_file_layout_from_legacy); |
| 43 | |
| 44 | void ceph_file_layout_to_legacy(struct ceph_file_layout *fl, |
| 45 | struct ceph_file_layout_legacy *legacy) |
| 46 | { |
| 47 | legacy->fl_stripe_unit = cpu_to_le32(fl->stripe_unit); |
| 48 | legacy->fl_stripe_count = cpu_to_le32(fl->stripe_count); |
| 49 | legacy->fl_object_size = cpu_to_le32(fl->object_size); |
| 50 | if (fl->pool_id >= 0) |
| 51 | legacy->fl_pg_pool = cpu_to_le32(fl->pool_id); |
| 52 | else |
| 53 | legacy->fl_pg_pool = 0; |
| 54 | } |
| 55 | EXPORT_SYMBOL(ceph_file_layout_to_legacy); |
| 56 | |
| 57 | int ceph_flags_to_mode(int flags) |
| 58 | { |
| 59 | int mode; |
| 60 | |
| 61 | #ifdef O_DIRECTORY /* fixme */ |
| 62 | if ((flags & O_DIRECTORY) == O_DIRECTORY) |
| 63 | return CEPH_FILE_MODE_PIN; |
| 64 | #endif |
| 65 | |
| 66 | switch (flags & O_ACCMODE) { |
| 67 | case O_WRONLY: |
| 68 | mode = CEPH_FILE_MODE_WR; |
| 69 | break; |
| 70 | case O_RDONLY: |
| 71 | mode = CEPH_FILE_MODE_RD; |
| 72 | break; |
| 73 | case O_RDWR: |
| 74 | case O_ACCMODE: /* this is what the VFS does */ |
| 75 | mode = CEPH_FILE_MODE_RDWR; |
| 76 | break; |
| 77 | } |
| 78 | #ifdef O_LAZY |
| 79 | if (flags & O_LAZY) |
| 80 | mode |= CEPH_FILE_MODE_LAZY; |
| 81 | #endif |
| 82 | |
| 83 | return mode; |
| 84 | } |
| 85 | EXPORT_SYMBOL(ceph_flags_to_mode); |
| 86 | |
| 87 | int ceph_caps_for_mode(int mode) |
| 88 | { |
| 89 | int caps = CEPH_CAP_PIN; |
| 90 | |
| 91 | if (mode & CEPH_FILE_MODE_RD) |
| 92 | caps |= CEPH_CAP_FILE_SHARED | |
| 93 | CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE; |
| 94 | if (mode & CEPH_FILE_MODE_WR) |
| 95 | caps |= CEPH_CAP_FILE_EXCL | |
| 96 | CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER | |
| 97 | CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL | |
| 98 | CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL; |
| 99 | if (mode & CEPH_FILE_MODE_LAZY) |
| 100 | caps |= CEPH_CAP_FILE_LAZYIO; |
| 101 | |
| 102 | return caps; |
| 103 | } |
| 104 | EXPORT_SYMBOL(ceph_caps_for_mode); |