1 // Copyright 2018 The Fuchsia Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include <stdlib.h>
6 #include <string.h>
7
8 #include <bitmap/raw-bitmap.h>
9
10 #ifdef __Fuchsia__
11 #include <lib/fzl/owned-vmo-mapper.h>
12 #endif
13
14 #include <minfs/block-txn.h>
15 #include <minfs/superblock.h>
16
17 #include <utility>
18
19 namespace minfs {
20
21 #ifdef __Fuchsia__
22
SuperblockManager(const Superblock * info,fzl::OwnedVmoMapper mapper)23 SuperblockManager::SuperblockManager(const Superblock* info, fzl::OwnedVmoMapper mapper) :
24 mapping_(std::move(mapper)) {}
25
26 #else
27
28 SuperblockManager::SuperblockManager(const Superblock* info) {
29 memcpy(&info_blk_[0], info, sizeof(Superblock));
30 }
31
32 #endif
33
34 SuperblockManager::~SuperblockManager() = default;
35
Create(Bcache * bc,const Superblock * info,fbl::unique_ptr<SuperblockManager> * out)36 zx_status_t SuperblockManager::Create(Bcache* bc, const Superblock* info,
37 fbl::unique_ptr<SuperblockManager>* out) {
38 zx_status_t status = CheckSuperblock(info, bc);
39 if (status != ZX_OK) {
40 FS_TRACE_ERROR("Minfs::Create failed to check info: %d\n", status);
41 return status;
42 }
43
44 #ifdef __Fuchsia__
45 fzl::OwnedVmoMapper mapper;
46 // Create the info vmo
47 if ((status = mapper.CreateAndMap(kMinfsBlockSize, "minfs-superblock")) != ZX_OK) {
48 return status;
49 }
50
51 vmoid_t info_vmoid;
52 if ((status = bc->AttachVmo(mapper.vmo(), &info_vmoid)) != ZX_OK) {
53 return status;
54 }
55 memcpy(mapper.start(), info, sizeof(Superblock));
56
57 auto sb = fbl::unique_ptr<SuperblockManager>(new SuperblockManager(info, std::move(mapper)));
58 #else
59 auto sb = fbl::unique_ptr<SuperblockManager>(new SuperblockManager(info));
60 #endif
61 *out = std::move(sb);
62 return ZX_OK;
63 }
64
Write(WriteTxn * txn)65 void SuperblockManager::Write(WriteTxn* txn) {
66 #ifdef __Fuchsia__
67 auto data = mapping_.vmo().get();
68 #else
69 auto data = &info_blk_[0];
70 #endif
71 txn->Enqueue(data, 0, 0, 1);
72 }
73
74 } // namespace minfs
75