| // Copyright 2016 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <fcntl.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <time.h> |
| #include <unistd.h> |
| #include <sys/stat.h> |
| |
| #include <fbl/algorithm.h> |
| #include <fbl/auto_call.h> |
| #include <fbl/string_piece.h> |
| #include <fs/block-txn.h> |
| #include <safemath/checked_math.h> |
| #include <zircon/device/vfs.h> |
| #include <zircon/time.h> |
| |
| #ifdef __Fuchsia__ |
| #include <lib/fdio/vfs.h> |
| #include <lib/fidl-utils/bind.h> |
| #include <fbl/auto_lock.h> |
| #include <zircon/syscalls.h> |
| |
| #include <utility> |
| #endif |
| |
| #include "directory.h" |
| #include "file.h" |
| #include "minfs-private.h" |
| #include "vnode.h" |
| |
| namespace minfs { |
| namespace { |
| |
| #ifdef __Fuchsia__ |
| |
| // MinfsConnection overrides the base Connection class to allow Minfs to |
| // dispatch its own ordinals. |
| class MinfsConnection : public fs::Connection { |
| public: |
| using MinfsConnectionBinder = fidl::Binder<MinfsConnection>; |
| |
| MinfsConnection(fs::Vfs* vfs, fbl::RefPtr<fs::Vnode> vnode, zx::channel channel, uint32_t flags) |
| : Connection(vfs, std::move(vnode), std::move(channel), flags) {} |
| |
| private: |
| VnodeMinfs& GetVnodeMinfs() const { |
| return reinterpret_cast<VnodeMinfs&>(GetVnode()); |
| } |
| |
| zx_status_t GetMetrics(fidl_txn_t* transaction) { |
| return GetVnodeMinfs().GetMetrics(transaction); |
| } |
| |
| zx_status_t ToggleMetrics(bool enable, fidl_txn_t* transaction) { |
| return GetVnodeMinfs().ToggleMetrics(enable, transaction); |
| } |
| |
| zx_status_t GetAllocatedRegions(fidl_txn_t* transaction) { |
| return GetVnodeMinfs().GetAllocatedRegions(transaction); |
| } |
| |
| static const fuchsia_minfs_Minfs_ops* Ops() { |
| static const fuchsia_minfs_Minfs_ops kMinfsOps = { |
| .GetMetrics = MinfsConnectionBinder::BindMember<&MinfsConnection::GetMetrics>, |
| .ToggleMetrics = MinfsConnectionBinder::BindMember<&MinfsConnection::ToggleMetrics>, |
| .GetAllocatedRegions = |
| MinfsConnectionBinder::BindMember<&MinfsConnection::GetAllocatedRegions>, |
| }; |
| return &kMinfsOps; |
| } |
| |
| zx_status_t HandleFsSpecificMessage(fidl_msg_t* msg, fidl_txn_t* transaction) final { |
| return fuchsia_minfs_Minfs_dispatch(this, transaction, msg, Ops()); |
| } |
| }; |
| |
| #endif |
| |
| } // namespace anonymous |
| |
| void VnodeMinfs::SetIno(ino_t ino) { |
| ZX_DEBUG_ASSERT(ino_ == 0); |
| ino_ = ino; |
| } |
| |
| void VnodeMinfs::InodeSync(WritebackWork* wb, uint32_t flags) { |
| // by default, c/mtimes are not updated to current time |
| if (flags != kMxFsSyncDefault) { |
| zx_time_t cur_time = GetTimeUTC(); |
| // update times before syncing |
| if ((flags & kMxFsSyncMtime) != 0) { |
| inode_.modify_time = cur_time; |
| } |
| if ((flags & kMxFsSyncCtime) != 0) { |
| inode_.create_time = cur_time; |
| } |
| } |
| |
| fs_->InodeUpdate(wb, ino_, &inode_); |
| } |
| |
| // Delete all blocks (relative to a file) from "start" (inclusive) to the end of |
| // the file. Does not update mtime/atime. |
| zx_status_t VnodeMinfs::BlocksShrink(Transaction* transaction, blk_t start) { |
| ZX_DEBUG_ASSERT(transaction != nullptr); |
| |
| auto block_callback = [this, transaction](blk_t local_bno, blk_t old_bno, blk_t* out_bno) { |
| DeleteBlock(transaction, local_bno, old_bno); |
| *out_bno = 0; |
| }; |
| |
| BlockOpArgs op_args(transaction, BlockOp::kDelete, std::move(block_callback), start, |
| static_cast<blk_t>(kMinfsMaxFileBlock - start), nullptr); |
| zx_status_t status; |
| if ((status = ApplyOperation(&op_args)) != ZX_OK) { |
| return status; |
| } |
| |
| #ifdef __Fuchsia__ |
| // Arbitrary minimum size for indirect vmo |
| size_t size = (kMinfsIndirect + kMinfsDoublyIndirect) * kMinfsBlockSize; |
| // Number of blocks before dindirect blocks start |
| blk_t pre_dindirect = kMinfsDirect + kMinfsDirectPerIndirect * kMinfsIndirect; |
| if (start > pre_dindirect) { |
| blk_t distart = start - pre_dindirect; //first bno relative to dindirect blocks |
| blk_t last_dindirect = distart / (kMinfsDirectPerDindirect); // index of last dindirect |
| |
| // Calculate new size for indirect vmo |
| if (distart % kMinfsDirectPerDindirect) { |
| size = GetVmoSizeForIndirect(last_dindirect); |
| } else if (last_dindirect) { |
| size = GetVmoSizeForIndirect(last_dindirect - 1); |
| } |
| } |
| |
| // Shrink the indirect vmo if necessary |
| if (vmo_indirect_ != nullptr && vmo_indirect_->size() > size) { |
| if ((status = vmo_indirect_->Shrink(size)) != ZX_OK) { |
| return status; |
| } |
| } |
| #endif |
| return ZX_OK; |
| } |
| |
| #ifdef __Fuchsia__ |
| |
| zx_status_t VnodeMinfs::LoadIndirectBlocks(blk_t* iarray, uint32_t count, uint32_t offset, |
| uint64_t size) { |
| zx_status_t status; |
| if ((status = InitIndirectVmo()) != ZX_OK) { |
| return status; |
| } |
| |
| if (vmo_indirect_->size() < size) { |
| zx_status_t status; |
| if ((status = vmo_indirect_->Grow(size)) != ZX_OK) { |
| return status; |
| } |
| } |
| |
| fs::ReadTxn read_transaction(fs_->bc_.get()); |
| |
| for (uint32_t i = 0; i < count; i++) { |
| blk_t ibno; |
| if ((ibno = iarray[i]) != 0) { |
| fs_->ValidateBno(ibno); |
| read_transaction.Enqueue(vmoid_indirect_.id, offset + i, |
| ibno + fs_->Info().dat_block, 1); |
| } |
| } |
| |
| return read_transaction.Transact(); |
| } |
| |
| zx_status_t VnodeMinfs::LoadIndirectWithinDoublyIndirect(uint32_t dindex) { |
| uint32_t* dientry; |
| |
| size_t size = GetVmoSizeForIndirect(dindex); |
| if (vmo_indirect_->size() >= size) { |
| // We've already loaded this indirect (within dind) block. |
| return ZX_OK; |
| } |
| |
| ReadIndirectVmoBlock(GetVmoOffsetForDoublyIndirect(dindex), &dientry); |
| return LoadIndirectBlocks(dientry, kMinfsDirectPerIndirect, |
| GetVmoOffsetForIndirect(dindex), size); |
| } |
| |
| zx_status_t VnodeMinfs::InitIndirectVmo() { |
| if (vmo_indirect_ != nullptr) { |
| return ZX_OK; |
| } |
| |
| vmo_indirect_ = fzl::ResizeableVmoMapper::Create( |
| kMinfsBlockSize * (kMinfsIndirect + kMinfsDoublyIndirect), "minfs-indirect"); |
| |
| zx_status_t status; |
| if ((status = fs_->bc_->AttachVmo(vmo_indirect_->vmo(), &vmoid_indirect_)) != ZX_OK) { |
| vmo_indirect_ = nullptr; |
| return status; |
| } |
| |
| // Load initial set of indirect blocks |
| if ((status = LoadIndirectBlocks(inode_.inum, kMinfsIndirect, 0, 0)) != ZX_OK) { |
| vmo_indirect_ = nullptr; |
| return status; |
| } |
| |
| // Load doubly indirect blocks |
| if ((status = LoadIndirectBlocks(inode_.dinum, kMinfsDoublyIndirect, |
| GetVmoOffsetForDoublyIndirect(0), |
| GetVmoSizeForDoublyIndirect()) != ZX_OK)) { |
| vmo_indirect_ = nullptr; |
| return status; |
| } |
| |
| return ZX_OK; |
| } |
| |
| // Since we cannot yet register the filesystem as a paging service (and cleanly |
| // fault on pages when they are actually needed), we currently read an entire |
| // file to a VMO when a file's data block are accessed. |
| // |
| // TODO(smklein): Even this hack can be optimized; a bitmap could be used to |
| // track all 'empty/read/dirty' blocks for each vnode, rather than reading |
| // the entire file. |
| zx_status_t VnodeMinfs::InitVmo(Transaction* transaction) { |
| if (vmo_.is_valid()) { |
| return ZX_OK; |
| } |
| |
| zx_status_t status; |
| const size_t vmo_size = fbl::round_up(GetSize(), kMinfsBlockSize); |
| if ((status = zx::vmo::create(vmo_size, 0, &vmo_)) != ZX_OK) { |
| FS_TRACE_ERROR("Failed to initialize vmo; error: %d\n", status); |
| return status; |
| } |
| vmo_size_ = vmo_size; |
| |
| zx_object_set_property(vmo_.get(), ZX_PROP_NAME, "minfs-inode", 11); |
| |
| if ((status = fs_->bc_->AttachVmo(vmo_, &vmoid_)) != ZX_OK) { |
| vmo_.reset(); |
| return status; |
| } |
| fs::ReadTxn read_transaction(fs_->bc_.get()); |
| uint32_t dnum_count = 0; |
| uint32_t inum_count = 0; |
| uint32_t dinum_count = 0; |
| fs::Ticker ticker(fs_->StartTicker()); |
| auto get_metrics = fbl::MakeAutoCall([&]() { |
| fs_->UpdateInitMetrics(dnum_count, inum_count, dinum_count, vmo_size, |
| ticker.End()); |
| }); |
| |
| // Initialize all direct blocks |
| blk_t bno; |
| for (uint32_t d = 0; d < kMinfsDirect; d++) { |
| if ((bno = inode_.dnum[d]) != 0) { |
| fs_->ValidateBno(bno); |
| dnum_count++; |
| read_transaction.Enqueue(vmoid_.id, d, bno + fs_->Info().dat_block, 1); |
| } |
| } |
| |
| // Initialize all indirect blocks |
| for (uint32_t i = 0; i < kMinfsIndirect; i++) { |
| blk_t ibno; |
| if ((ibno = inode_.inum[i]) != 0) { |
| fs_->ValidateBno(ibno); |
| inum_count++; |
| |
| // Only initialize the indirect vmo if it is being used. |
| if ((status = InitIndirectVmo()) != ZX_OK) { |
| vmo_.reset(); |
| return status; |
| } |
| |
| uint32_t* ientry; |
| ReadIndirectVmoBlock(i, &ientry); |
| |
| for (uint32_t j = 0; j < kMinfsDirectPerIndirect; j++) { |
| if ((bno = ientry[j]) != 0) { |
| fs_->ValidateBno(bno); |
| uint32_t n = kMinfsDirect + i * kMinfsDirectPerIndirect + j; |
| read_transaction.Enqueue(vmoid_.id, n, bno + fs_->Info().dat_block, 1); |
| } |
| } |
| } |
| } |
| |
| // Initialize all doubly indirect blocks |
| for (uint32_t i = 0; i < kMinfsDoublyIndirect; i++) { |
| blk_t dibno; |
| |
| if ((dibno = inode_.dinum[i]) != 0) { |
| fs_->ValidateBno(dibno); |
| dinum_count++; |
| |
| // Only initialize the doubly indirect vmo if it is being used. |
| if ((status = InitIndirectVmo()) != ZX_OK) { |
| vmo_.reset(); |
| return status; |
| } |
| |
| uint32_t* dientry; |
| ReadIndirectVmoBlock(GetVmoOffsetForDoublyIndirect(i), &dientry); |
| |
| for (uint32_t j = 0; j < kMinfsDirectPerIndirect; j++) { |
| blk_t ibno; |
| if ((ibno = dientry[j]) != 0) { |
| fs_->ValidateBno(ibno); |
| |
| // Only initialize the indirect vmo if it is being used. |
| if ((status = LoadIndirectWithinDoublyIndirect(i)) != ZX_OK) { |
| vmo_.reset(); |
| return status; |
| } |
| |
| uint32_t* ientry; |
| ReadIndirectVmoBlock(GetVmoOffsetForIndirect(i) + j, &ientry); |
| |
| for (uint32_t k = 0; k < kMinfsDirectPerIndirect; k++) { |
| if ((bno = ientry[k]) != 0) { |
| fs_->ValidateBno(bno); |
| uint32_t n = kMinfsDirect + kMinfsIndirect * kMinfsDirectPerIndirect |
| + j * kMinfsDirectPerIndirect + k; |
| read_transaction.Enqueue(vmoid_.id, n, bno + fs_->Info().dat_block, 1); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| status = read_transaction.Transact(); |
| ValidateVmoTail(GetSize()); |
| return status; |
| } |
| #endif |
| |
| void VnodeMinfs::AllocateIndirect(Transaction* transaction, blk_t index, IndirectArgs* args) { |
| ZX_DEBUG_ASSERT(transaction != nullptr); |
| |
| // *bno must not be already allocated |
| ZX_DEBUG_ASSERT(args->GetBno(index) == 0); |
| |
| // allocate new indirect block |
| blk_t bno; |
| fs_->BlockNew(transaction, &bno); |
| |
| #ifdef __Fuchsia__ |
| ClearIndirectVmoBlock(args->GetOffset() + index); |
| #else |
| ClearIndirectBlock(bno); |
| #endif |
| |
| args->SetBno(index, bno); |
| inode_.block_count++; |
| } |
| |
| zx_status_t VnodeMinfs::BlockOpDirect(BlockOpArgs* op_args, DirectArgs* params) { |
| for (unsigned i = 0; i < params->GetCount(); i++) { |
| blk_t bno = params->GetBno(i); |
| op_args->callback(params->GetRelativeBlock() + i, bno, &bno); |
| params->SetBno(i, bno); |
| } |
| return ZX_OK; |
| } |
| |
| zx_status_t VnodeMinfs::BlockOpIndirect(BlockOpArgs* op_args, IndirectArgs* params) { |
| // we should have initialized vmo before calling this method |
| zx_status_t status; |
| |
| #ifdef __Fuchsia__ |
| if (params->GetOp() != BlockOp::kDelete) { |
| ValidateVmoSize(vmo_indirect_->vmo().get(), params->GetOffset() + params->GetCount()); |
| } |
| #endif |
| |
| for (unsigned i = 0; i < params->GetCount(); i++) { |
| // If the indirect block is newly allocated, we must write an empty block out to disk. |
| bool allocated = false; |
| if (params->GetBno(i) == 0) { |
| switch (params->GetOp()) { |
| case BlockOp::kDelete: |
| continue; |
| case BlockOp::kRead: |
| continue; |
| case BlockOp::kSwap: |
| __FALLTHROUGH; |
| case BlockOp::kWrite: |
| AllocateIndirect(op_args->transaction, i, params); |
| allocated = true; |
| break; |
| default: |
| return ZX_ERR_NOT_SUPPORTED; |
| } |
| |
| } |
| |
| #ifdef __Fuchsia__ |
| blk_t* entry; |
| ReadIndirectVmoBlock(params->GetOffset() + i, &entry); |
| #else |
| blk_t entry[kMinfsBlockSize]; |
| ReadIndirectBlock(params->GetBno(i), entry); |
| #endif |
| |
| DirectArgs direct_params = params->GetDirect(entry, i); |
| if ((status = BlockOpDirect(op_args, &direct_params)) != ZX_OK) { |
| return status; |
| } |
| |
| // We can delete the current indirect block if all direct blocks within it are deleted |
| if (params->GetOp() == BlockOp::kDelete |
| && direct_params.GetCount() == kMinfsDirectPerIndirect) { |
| // release the indirect block itself |
| fs_->BlockFree(op_args->transaction, params->GetBno(i)); |
| params->SetBno(i, 0); |
| inode_.block_count--; |
| } else if (allocated || direct_params.IsDirty()) { |
| // Only update the indirect block if an entry was deleted, and the indirect block |
| // itself was not deleted. |
| #ifdef __Fuchsia__ |
| op_args->transaction->GetWork()->Enqueue(vmo_indirect_->vmo().get(), |
| params->GetOffset() + i, |
| params->GetBno(i) + fs_->Info().dat_block, |
| 1); |
| #else |
| fs_->bc_->Writeblk(params->GetBno(i) + fs_->Info().dat_block, entry); |
| #endif |
| params->SetDirty(); |
| } |
| } |
| |
| return ZX_OK; |
| |
| } |
| |
| zx_status_t VnodeMinfs::BlockOpDindirect(BlockOpArgs* op_args, DindirectArgs* params) { |
| zx_status_t status; |
| |
| #ifdef __Fuchsia__ |
| if (params->GetOp() != BlockOp::kDelete) { |
| ValidateVmoSize(vmo_indirect_->vmo().get(), params->GetOffset() + params->GetCount()); |
| } |
| #endif |
| |
| // operate on doubly indirect blocks |
| for (unsigned i = 0; i < params->GetCount(); i++) { |
| // If the indirect block is newly allocated, we must write an empty block out to disk. |
| bool allocated = false; |
| if (params->GetBno(i) == 0) { |
| switch (params->GetOp()) { |
| case BlockOp::kDelete: |
| continue; |
| case BlockOp::kRead: |
| continue; |
| case BlockOp::kSwap: |
| __FALLTHROUGH; |
| case BlockOp::kWrite: |
| AllocateIndirect(op_args->transaction, i, params); |
| allocated = true; |
| break; |
| default: |
| return ZX_ERR_NOT_SUPPORTED; |
| } |
| } |
| |
| #ifdef __Fuchsia__ |
| uint32_t* dientry; |
| ReadIndirectVmoBlock(GetVmoOffsetForDoublyIndirect(i), &dientry); |
| #else |
| uint32_t dientry[kMinfsBlockSize]; |
| ReadIndirectBlock(params->GetBno(i), dientry); |
| #endif |
| |
| // operate on blocks pointed at by the entries in the indirect block |
| IndirectArgs indirect_params = params->GetIndirect(dientry, i); |
| if ((status = BlockOpIndirect(op_args, &indirect_params)) != ZX_OK) { |
| return status; |
| } |
| |
| // We can delete the current doubly indirect block if all indirect blocks within it |
| // (and direct blocks within those) are deleted |
| if (params->GetOp() == BlockOp::kDelete && |
| indirect_params.GetCount() == kMinfsDirectPerDindirect) { |
| // release the doubly indirect block itself |
| fs_->BlockFree(op_args->transaction, params->GetBno(i)); |
| params->SetBno(i, 0); |
| inode_.block_count--; |
| } else if (allocated || indirect_params.IsDirty()) { |
| // Only update the indirect block if an entry was deleted, and the indirect block |
| // itself was not deleted. |
| #ifdef __Fuchsia__ |
| op_args->transaction->GetWork()->Enqueue(vmo_indirect_->vmo().get(), |
| params->GetOffset() + i, |
| params->GetBno(i) + fs_->Info().dat_block, 1); |
| #else |
| fs_->bc_->Writeblk(params->GetBno(i) + fs_->Info().dat_block, dientry); |
| #endif |
| params->SetDirty(); |
| } |
| } |
| |
| return ZX_OK; |
| } |
| |
| #ifdef __Fuchsia__ |
| void VnodeMinfs::ReadIndirectVmoBlock(uint32_t offset, uint32_t** entry) { |
| ZX_DEBUG_ASSERT(vmo_indirect_ != nullptr); |
| uintptr_t addr = reinterpret_cast<uintptr_t>(vmo_indirect_->start()); |
| ValidateVmoSize(vmo_indirect_->vmo().get(), offset); |
| *entry = reinterpret_cast<uint32_t*>(addr + kMinfsBlockSize * offset); |
| } |
| |
| void VnodeMinfs::ClearIndirectVmoBlock(uint32_t offset) { |
| ZX_DEBUG_ASSERT(vmo_indirect_ != nullptr); |
| uintptr_t addr = reinterpret_cast<uintptr_t>(vmo_indirect_->start()); |
| ValidateVmoSize(vmo_indirect_->vmo().get(), offset); |
| memset(reinterpret_cast<void*>(addr + kMinfsBlockSize * offset), 0, kMinfsBlockSize); |
| } |
| #else |
| void VnodeMinfs::ReadIndirectBlock(blk_t bno, uint32_t* entry) { |
| fs_->bc_->Readblk(bno + fs_->Info().dat_block, entry); |
| } |
| |
| void VnodeMinfs::ClearIndirectBlock(blk_t bno) { |
| uint32_t data[kMinfsBlockSize]; |
| memset(data, 0, kMinfsBlockSize); |
| fs_->bc_->Writeblk(bno + fs_->Info().dat_block, data); |
| } |
| #endif |
| |
| zx_status_t VnodeMinfs::ApplyOperation(BlockOpArgs* op_args) { |
| blk_t start = op_args->start; |
| blk_t found = 0; |
| bool dirty = false; |
| if (found < op_args->count && start < kMinfsDirect) { |
| // array starting with first direct block |
| blk_t* array = &inode_.dnum[start]; |
| // number of direct blocks to process |
| blk_t count = fbl::min(op_args->count - found, kMinfsDirect - start); |
| // if bnos exist, adjust past found (should be 0) |
| blk_t* bnos = op_args->bnos == nullptr ? nullptr : &op_args->bnos[found]; |
| |
| DirectArgs direct_params(op_args->op, array, count, op_args->start, bnos); |
| zx_status_t status; |
| if ((status = BlockOpDirect(op_args, &direct_params)) != ZX_OK) { |
| return status; |
| } |
| |
| found += count; |
| dirty |= direct_params.IsDirty(); |
| } |
| |
| // for indirect blocks, adjust past the direct blocks |
| if (start < kMinfsDirect) { |
| start = 0; |
| } else { |
| start -= kMinfsDirect; |
| } |
| |
| if (found < op_args->count && start < kMinfsIndirect * kMinfsDirectPerIndirect) { |
| // index of indirect block, and offset of that block within indirect vmo |
| blk_t ibindex = start / kMinfsDirectPerIndirect; |
| // index of direct block within indirect block |
| blk_t bindex = start % kMinfsDirectPerIndirect; |
| |
| // array starting with first indirect block |
| blk_t* array = &inode_.inum[ibindex]; |
| // number of direct blocks to process within indirect blocks |
| blk_t count = fbl::min(op_args->count - found, |
| kMinfsIndirect * kMinfsDirectPerIndirect - start); |
| // if bnos exist, adjust past found |
| blk_t* bnos = op_args->bnos == nullptr ? nullptr : &op_args->bnos[found]; |
| |
| IndirectArgs indirect_params(op_args->op, array, count, op_args->start + found, |
| bnos, bindex, ibindex); |
| zx_status_t status; |
| if ((status = BlockOpIndirect(op_args, &indirect_params)) != ZX_OK) { |
| return status; |
| } |
| |
| found += count; |
| dirty |= indirect_params.IsDirty(); |
| } |
| |
| // for doubly indirect blocks, adjust past the indirect blocks |
| if (start < kMinfsIndirect * kMinfsDirectPerIndirect) { |
| start = 0; |
| } else { |
| start -= kMinfsIndirect * kMinfsDirectPerIndirect; |
| } |
| |
| if (found < op_args->count && |
| start < kMinfsDoublyIndirect * kMinfsDirectPerIndirect * kMinfsDirectPerIndirect) { |
| // index of doubly indirect block |
| uint32_t dibindex = start / (kMinfsDirectPerIndirect * kMinfsDirectPerIndirect); |
| ZX_DEBUG_ASSERT(dibindex < kMinfsDoublyIndirect); |
| start -= (dibindex * kMinfsDirectPerIndirect * kMinfsDirectPerIndirect); |
| |
| // array starting with first doubly indirect block |
| blk_t* array = &inode_.dinum[dibindex]; |
| // number of direct blocks to process within doubly indirect blocks |
| blk_t count = fbl::min(op_args->count - found, |
| kMinfsDoublyIndirect * kMinfsDirectPerIndirect * kMinfsDirectPerIndirect - start); |
| // if bnos exist, adjust past found |
| blk_t* bnos = op_args->bnos == nullptr ? nullptr : &op_args->bnos[found]; |
| // index of direct block within indirect block |
| blk_t bindex = start % kMinfsDirectPerIndirect; |
| // offset of indirect block within indirect vmo |
| blk_t ib_vmo_offset = GetVmoOffsetForIndirect(dibindex); |
| // index of indirect block within doubly indirect block |
| blk_t ibindex = start / kMinfsDirectPerIndirect; |
| // offset of doubly indirect block within indirect vmo |
| blk_t dib_vmo_offset = GetVmoOffsetForDoublyIndirect(dibindex); |
| |
| DindirectArgs dindirect_params(op_args->op, array, count, op_args->start + found, bnos, |
| bindex, ib_vmo_offset, ibindex, dib_vmo_offset); |
| zx_status_t status; |
| if ((status = BlockOpDindirect(op_args, &dindirect_params)) != ZX_OK) { |
| return status; |
| } |
| |
| found += count; |
| dirty |= dindirect_params.IsDirty(); |
| } |
| |
| if (dirty) { |
| ZX_DEBUG_ASSERT(op_args->transaction != nullptr); |
| InodeSync(op_args->transaction->GetWork(), kMxFsSyncDefault); |
| } |
| |
| // Return out of range if we were not able to process all blocks |
| return found == op_args->count ? ZX_OK : ZX_ERR_OUT_OF_RANGE; |
| } |
| |
| zx_status_t VnodeMinfs::EnsureIndirectVmoSize(blk_t n) { |
| #ifdef __Fuchsia__ |
| if (n >= kMinfsDirect) { |
| zx_status_t status; |
| // If the vmo_indirect_ vmo has not been created, make it now. |
| if ((status = InitIndirectVmo()) != ZX_OK) { |
| return status; |
| } |
| |
| // Number of blocks prior to dindirect blocks |
| blk_t pre_dindirect = kMinfsDirect + kMinfsDirectPerIndirect * kMinfsIndirect; |
| if (n >= pre_dindirect) { |
| // Index of last doubly indirect block |
| blk_t dibindex = (n - pre_dindirect) / kMinfsDirectPerDindirect; |
| ZX_DEBUG_ASSERT(dibindex < kMinfsDoublyIndirect); |
| uint64_t vmo_size = GetVmoSizeForIndirect(dibindex); |
| // Grow VMO if we need more space to fit doubly indirect blocks |
| if (vmo_indirect_->size() < vmo_size) { |
| if ((status = vmo_indirect_->Grow(vmo_size)) != ZX_OK) { |
| return status; |
| } |
| } |
| } |
| } |
| #endif |
| return ZX_OK; |
| } |
| |
| zx_status_t VnodeMinfs::BlockGetWritable(Transaction* transaction, blk_t n, blk_t* bno) { |
| zx_status_t status = EnsureIndirectVmoSize(n); |
| if (status != ZX_OK) { |
| return ZX_OK; |
| } |
| |
| auto block_callback = [this, transaction](blk_t local_bno, blk_t old_bno, blk_t* out_bno) { |
| AcquireWritableBlock(transaction, local_bno, old_bno, out_bno); |
| }; |
| BlockOpArgs op_args(transaction, BlockOp::kWrite, std::move(block_callback), n, 1, bno); |
| return ApplyOperation(&op_args); |
| } |
| |
| zx_status_t VnodeMinfs::BlockGetReadable(blk_t n, blk_t* bno) { |
| zx_status_t status = EnsureIndirectVmoSize(n); |
| if (status != ZX_OK) { |
| return ZX_OK; |
| } |
| |
| // Just acquire the old values. |
| auto block_callback = [](blk_t local_bno, blk_t old_bno, blk_t* out_bno) {}; |
| |
| BlockOpArgs op_args(nullptr, BlockOp::kRead, std::move(block_callback), n, 1, bno); |
| return ApplyOperation(&op_args); |
| } |
| |
| zx_status_t VnodeMinfs::ReadExactInternal(Transaction* transaction, void* data, size_t len, |
| size_t off) { |
| size_t actual; |
| zx_status_t status = ReadInternal(transaction, data, len, off, &actual); |
| if (status != ZX_OK) { |
| return status; |
| } else if (actual != len) { |
| return ZX_ERR_IO; |
| } |
| return ZX_OK; |
| } |
| |
| zx_status_t VnodeMinfs::WriteExactInternal(Transaction* transaction, const void* data, |
| size_t len, size_t off) { |
| size_t actual; |
| zx_status_t status = WriteInternal(transaction, data, len, off, &actual); |
| if (status != ZX_OK) { |
| return status; |
| } else if (actual != len) { |
| return ZX_ERR_IO; |
| } |
| InodeSync(transaction->GetWork(), kMxFsSyncMtime); |
| return ZX_OK; |
| } |
| |
| void VnodeMinfs::RemoveInodeLink(Transaction* transaction) { |
| ZX_ASSERT(inode_.link_count > 0); |
| |
| // This effectively 'unlinks' the target node without deleting the direntry |
| inode_.link_count--; |
| if (IsDirectory()) { |
| if (inode_.link_count == 1) { |
| // Directories are initialized with two links, since they point |
| // to themselves via ".". Thus, when they reach "one link", they |
| // are only pointed to by themselves, and should be deleted. |
| inode_.link_count--; |
| } |
| } |
| |
| if (IsUnlinked()) { |
| if (fd_count_ == 0) { |
| Purge(transaction); |
| } else { |
| fs_->AddUnlinked(transaction, this); |
| } |
| } |
| |
| InodeSync(transaction->GetWork(), kMxFsSyncMtime); |
| } |
| |
| void VnodeMinfs::ValidateVmoTail(uint64_t inode_size) const { |
| #if defined(MINFS_PARANOID_MODE) && defined(__Fuchsia__) |
| if (!vmo_.is_valid()) { |
| return; |
| } |
| |
| // Verify that everything not allocated to "inode_size" in the |
| // last block is filled with zeroes. |
| char buf[kMinfsBlockSize]; |
| const size_t vmo_size = fbl::round_up(inode_size, kMinfsBlockSize); |
| ZX_ASSERT(vmo_.read(buf, inode_size, vmo_size - inode_size) == ZX_OK); |
| for (size_t i = 0; i < vmo_size - inode_size; i++) { |
| ZX_ASSERT_MSG(buf[i] == 0, "vmo[%" PRIu64 "] != 0 (inode size = %u)\n", |
| inode_size + i, inode_size); |
| } |
| #endif // MINFS_PARANOID_MODE && __Fuchsia__ |
| } |
| |
| void VnodeMinfs::fbl_recycle() { |
| ZX_DEBUG_ASSERT(fd_count_ == 0); |
| if (!IsUnlinked()) { |
| // If this node has not been purged already, remove it from the |
| // hash map. If it has been purged; it will already be absent |
| // from the map (and may have already been replaced with a new |
| // node, if the inode has been re-used). |
| fs_->VnodeRelease(this); |
| } |
| delete this; |
| } |
| |
| VnodeMinfs::~VnodeMinfs() { |
| #ifdef __Fuchsia__ |
| // Detach the vmoids from the underlying block device, |
| // so the underlying VMO may be released. |
| size_t request_count = 0; |
| block_fifo_request_t request[2]; |
| if (vmo_.is_valid()) { |
| request[request_count].group = fs_->bc_->BlockGroupID(); |
| request[request_count].vmoid = vmoid_.id; |
| request[request_count].opcode = BLOCKIO_CLOSE_VMO; |
| request_count++; |
| } |
| if (vmo_indirect_ != nullptr) { |
| request[request_count].group = fs_->bc_->BlockGroupID(); |
| request[request_count].vmoid = vmoid_indirect_.id; |
| request[request_count].opcode = BLOCKIO_CLOSE_VMO; |
| request_count++; |
| } |
| if (request_count) { |
| fs_->bc_->Transaction(&request[0], request_count); |
| } |
| #endif |
| } |
| |
| #ifdef __Fuchsia__ |
| zx_status_t VnodeMinfs::Serve(fs::Vfs* vfs, zx::channel channel, uint32_t flags) { |
| return vfs->ServeConnection(std::make_unique<MinfsConnection>( |
| vfs, fbl::WrapRefPtr(this), std::move(channel), flags)); |
| } |
| #endif |
| |
| zx_status_t VnodeMinfs::Open(uint32_t flags, fbl::RefPtr<Vnode>* out_redirect) { |
| fd_count_++; |
| return ZX_OK; |
| } |
| |
| void VnodeMinfs::Purge(Transaction* transaction) { |
| ZX_DEBUG_ASSERT(fd_count_ == 0); |
| ZX_DEBUG_ASSERT(IsUnlinked()); |
| fs_->VnodeRelease(this); |
| #ifdef __Fuchsia__ |
| // TODO(smklein): Only init indirect vmo if it's needed |
| if (InitIndirectVmo() == ZX_OK) { |
| fs_->InoFree(transaction, this); |
| } else { |
| FS_TRACE_ERROR("minfs: Failed to Init Indirect VMO while purging %u\n", ino_); |
| } |
| #else |
| fs_->InoFree(transaction, this); |
| #endif |
| } |
| |
| zx_status_t VnodeMinfs::Close() { |
| ZX_DEBUG_ASSERT_MSG(fd_count_ > 0, "Closing ino with no fds open"); |
| fd_count_--; |
| |
| if (fd_count_ == 0 && IsUnlinked()) { |
| zx_status_t status; |
| fbl::unique_ptr<Transaction> transaction; |
| if ((status = fs_->BeginTransaction(0, 0, &transaction)) != ZX_OK) { |
| return status; |
| } |
| fs_->RemoveUnlinked(transaction.get(), this); |
| Purge(transaction.get()); |
| return fs_->CommitTransaction(std::move(transaction)); |
| } |
| return ZX_OK; |
| } |
| |
| // Internal read. Usable on directories. |
| zx_status_t VnodeMinfs::ReadInternal(Transaction* transaction, void* data, size_t len, size_t off, |
| size_t* actual) { |
| // clip to EOF |
| if (off >= GetSize()) { |
| *actual = 0; |
| return ZX_OK; |
| } |
| if (len > (GetSize() - off)) { |
| len = GetSize() - off; |
| } |
| |
| zx_status_t status; |
| #ifdef __Fuchsia__ |
| if ((status = InitVmo(transaction)) != ZX_OK) { |
| return status; |
| } else if ((status = vmo_.read(data, off, len)) != ZX_OK) { |
| return status; |
| } else { |
| *actual = len; |
| } |
| #else |
| void* start = data; |
| uint32_t n = static_cast<uint32_t>(off / kMinfsBlockSize); |
| size_t adjust = off % kMinfsBlockSize; |
| |
| while ((len > 0) && (n < kMinfsMaxFileBlock)) { |
| size_t xfer; |
| if (len > (kMinfsBlockSize - adjust)) { |
| xfer = kMinfsBlockSize - adjust; |
| } else { |
| xfer = len; |
| } |
| |
| blk_t bno; |
| if ((status = BlockGetReadable(n, &bno)) != ZX_OK) { |
| return status; |
| } |
| if (bno != 0) { |
| char bdata[kMinfsBlockSize]; |
| if (fs_->ReadDat(bno, bdata)) { |
| FS_TRACE_ERROR("minfs: Failed to read data block %u\n", bno); |
| return ZX_ERR_IO; |
| } |
| memcpy(data, bdata + adjust, xfer); |
| } else { |
| // If the block is not allocated, just read zeros |
| memset(data, 0, xfer); |
| } |
| |
| adjust = 0; |
| len -= xfer; |
| data = (void*)((uintptr_t)data + xfer); |
| n++; |
| } |
| *actual = (uintptr_t)data - (uintptr_t)start; |
| #endif |
| return ZX_OK; |
| } |
| |
| // Internal write. Usable on directories. |
| zx_status_t VnodeMinfs::WriteInternal(Transaction* transaction, const void* data, |
| size_t len, size_t off, size_t* actual) { |
| if (len == 0) { |
| *actual = 0; |
| return ZX_OK; |
| } |
| zx_status_t status; |
| #ifdef __Fuchsia__ |
| // TODO(planders): Once we are splitting up write transactions, assert this on host as well. |
| ZX_DEBUG_ASSERT(len < TransactionLimits::kMaxWriteBytes); |
| if ((status = InitVmo(transaction)) != ZX_OK) { |
| return status; |
| } |
| |
| #else |
| size_t max_size = off + len; |
| #endif |
| |
| const void* const start = data; |
| uint32_t n = static_cast<uint32_t>(off / kMinfsBlockSize); |
| size_t adjust = off % kMinfsBlockSize; |
| |
| while ((len > 0) && (n < kMinfsMaxFileBlock)) { |
| size_t xfer; |
| if (len > (kMinfsBlockSize - adjust)) { |
| xfer = kMinfsBlockSize - adjust; |
| } else { |
| xfer = len; |
| } |
| |
| #ifdef __Fuchsia__ |
| size_t xfer_off = n * kMinfsBlockSize + adjust; |
| if ((xfer_off + xfer) > vmo_size_) { |
| size_t new_size = fbl::round_up(xfer_off + xfer, kMinfsBlockSize); |
| ZX_DEBUG_ASSERT(new_size >= GetSize()); // Overflow. |
| if ((status = vmo_.set_size(new_size)) != ZX_OK) { |
| break; |
| } |
| vmo_size_ = new_size; |
| } |
| |
| // Update this block of the in-memory VMO |
| if ((status = vmo_.write(data, xfer_off, xfer)) != ZX_OK) { |
| break; |
| } |
| |
| // Update this block on-disk |
| blk_t bno; |
| if ((status = BlockGetWritable(transaction, n, &bno))) { |
| break; |
| } |
| |
| IssueWriteback(transaction, n, bno + fs_->Info().dat_block, 1); |
| #else // __Fuchsia__ |
| blk_t bno; |
| if ((status = BlockGetWritable(transaction, n, &bno))) { |
| break; |
| } |
| ZX_DEBUG_ASSERT(bno != 0); |
| char wdata[kMinfsBlockSize]; |
| if (fs_->bc_->Readblk(bno + fs_->Info().dat_block, wdata)) { |
| break; |
| } |
| memcpy(wdata + adjust, data, xfer); |
| if (len < kMinfsBlockSize && max_size >= GetSize()) { |
| memset(wdata + adjust + xfer, 0, kMinfsBlockSize - (adjust + xfer)); |
| } |
| if (fs_->bc_->Writeblk(bno + fs_->Info().dat_block, wdata)) { |
| break; |
| } |
| #endif // __Fuchsia__ |
| |
| adjust = 0; |
| len -= xfer; |
| data = (void*)((uintptr_t)(data) + xfer); |
| n++; |
| } |
| |
| len = (uintptr_t)data - (uintptr_t)start; |
| if (len == 0) { |
| // If more than zero bytes were requested, but zero bytes were written, |
| // return an error explicitly (rather than zero). |
| if (off >= kMinfsMaxFileSize) { |
| return ZX_ERR_FILE_BIG; |
| } |
| |
| return ZX_ERR_NO_SPACE; |
| } |
| |
| if ((off + len) > GetSize()) { |
| SetSize(static_cast<uint32_t>(off + len)); |
| } |
| |
| *actual = len; |
| |
| ValidateVmoTail(GetSize()); |
| return ZX_OK; |
| } |
| |
| zx_status_t VnodeMinfs::Getattr(vnattr_t* a) { |
| FS_TRACE_DEBUG("minfs_getattr() vn=%p(#%u)\n", this, ino_); |
| // This transaction exists because acquiring the block size and block |
| // count may be unsafe without locking. |
| // |
| // TODO: Improve locking semantics of pending data allocation to make this less confusing. |
| Transaction transaction(fs_); |
| a->mode = DTYPE_TO_VTYPE(MinfsMagicType(inode_.magic)) | |
| V_IRUSR | V_IWUSR | V_IRGRP | V_IROTH; |
| a->inode = ino_; |
| a->size = GetSize(); |
| a->blksize = kMinfsBlockSize; |
| a->blkcount = GetBlockCount() * (kMinfsBlockSize / VNATTR_BLKSIZE); |
| a->nlink = inode_.link_count; |
| a->create_time = inode_.create_time; |
| a->modify_time = inode_.modify_time; |
| return ZX_OK; |
| } |
| |
| zx_status_t VnodeMinfs::Setattr(const vnattr_t* a) { |
| int dirty = 0; |
| FS_TRACE_DEBUG("minfs_setattr() vn=%p(#%u)\n", this, ino_); |
| if ((a->valid & ~(ATTR_CTIME|ATTR_MTIME)) != 0) { |
| return ZX_ERR_NOT_SUPPORTED; |
| } |
| if ((a->valid & ATTR_CTIME) != 0) { |
| inode_.create_time = a->create_time; |
| dirty = 1; |
| } |
| if ((a->valid & ATTR_MTIME) != 0) { |
| inode_.modify_time = a->modify_time; |
| dirty = 1; |
| } |
| if (dirty) { |
| // write to disk, but don't overwrite the time |
| zx_status_t status; |
| fbl::unique_ptr<Transaction> transaction; |
| if ((status = fs_->BeginTransaction(0, 0, &transaction)) != ZX_OK) { |
| return status; |
| } |
| InodeSync(transaction->GetWork(), kMxFsSyncDefault); |
| transaction->GetWork()->PinVnode(fbl::WrapRefPtr(this)); |
| return fs_->CommitTransaction(std::move(transaction)); |
| } |
| return ZX_OK; |
| } |
| |
| VnodeMinfs::VnodeMinfs(Minfs* fs) : fs_(fs) {} |
| |
| #ifdef __Fuchsia__ |
| void VnodeMinfs::Notify(fbl::StringPiece name, unsigned event) { watcher_.Notify(name, event); } |
| zx_status_t VnodeMinfs::WatchDir(fs::Vfs* vfs, uint32_t mask, uint32_t options, |
| zx::channel watcher) { |
| return watcher_.WatchDir(vfs, this, mask, options, std::move(watcher)); |
| } |
| |
| bool VnodeMinfs::IsRemote() const { return remoter_.IsRemote(); } |
| zx::channel VnodeMinfs::DetachRemote() { return remoter_.DetachRemote(); } |
| zx_handle_t VnodeMinfs::GetRemote() const { return remoter_.GetRemote(); } |
| void VnodeMinfs::SetRemote(zx::channel remote) { return remoter_.SetRemote(std::move(remote)); } |
| |
| #endif |
| |
| void VnodeMinfs::Allocate(Minfs* fs, uint32_t type, fbl::RefPtr<VnodeMinfs>* out) { |
| if (type == kMinfsTypeDir) { |
| *out = fbl::AdoptRef(new Directory(fs)); |
| } else { |
| *out = fbl::AdoptRef(new File(fs)); |
| } |
| memset(&(*out)->inode_, 0, sizeof((*out)->inode_)); |
| (*out)->inode_.magic = MinfsMagic(type); |
| (*out)->inode_.create_time = (*out)->inode_.modify_time = GetTimeUTC(); |
| if (type == kMinfsTypeDir) { |
| (*out)->inode_.link_count = 2; |
| // "." and "..". |
| (*out)->inode_.dirent_count = 2; |
| } else { |
| (*out)->inode_.link_count = 1; |
| } |
| } |
| |
| zx_status_t VnodeMinfs::Recreate(Minfs* fs, ino_t ino, fbl::RefPtr<VnodeMinfs>* out) { |
| Inode inode; |
| fs->InodeLoad(ino, &inode); |
| if (inode.magic == kMinfsMagicDir) { |
| *out = fbl::AdoptRef(new Directory(fs)); |
| } else { |
| *out = fbl::AdoptRef(new File(fs)); |
| } |
| memcpy(&(*out)->inode_, &inode, sizeof(inode)); |
| |
| // TODO: Loading the inode should be part of the private constructor of a Vnode. |
| fs->InodeLoad(ino, &(*out)->inode_); |
| (*out)->ino_ = ino; |
| (*out)->SetSize((*out)->inode_.size); |
| return ZX_OK; |
| } |
| |
| #ifdef __Fuchsia__ |
| |
| constexpr const char kFsName[] = "minfs"; |
| |
| zx_status_t VnodeMinfs::QueryFilesystem(fuchsia_io_FilesystemInfo* info) { |
| static_assert(fbl::constexpr_strlen(kFsName) + 1 < fuchsia_io_MAX_FS_NAME_BUFFER, |
| "Minfs name too long"); |
| Transaction transaction(fs_); |
| memset(info, 0, sizeof(*info)); |
| info->block_size = kMinfsBlockSize; |
| info->max_filename_size = kMinfsMaxNameSize; |
| info->fs_type = VFS_TYPE_MINFS; |
| info->fs_id = fs_->GetFsId(); |
| info->total_bytes = fs_->Info().block_count * fs_->Info().block_size; |
| info->used_bytes = fs_->Info().alloc_block_count * fs_->Info().block_size; |
| info->total_nodes = fs_->Info().inode_count; |
| info->used_nodes = fs_->Info().alloc_inode_count; |
| |
| fuchsia_hardware_block_volume_VolumeInfo fvm_info; |
| if (fs_->FVMQuery(&fvm_info) == ZX_OK) { |
| uint64_t free_slices = fvm_info.pslice_total_count - fvm_info.pslice_allocated_count; |
| info->free_shared_pool_bytes = fvm_info.slice_size * free_slices; |
| } |
| |
| strlcpy(reinterpret_cast<char*>(info->name), kFsName, fuchsia_io_MAX_FS_NAME_BUFFER); |
| return ZX_OK; |
| } |
| |
| zx_status_t VnodeMinfs::GetDevicePath(size_t buffer_len, char* out_name, size_t* out_len) { |
| return fs_->bc_->GetDevicePath(buffer_len, out_name, out_len); |
| } |
| |
| zx_status_t VnodeMinfs::GetMetrics(fidl_txn_t* transaction) { |
| fuchsia_minfs_Metrics metrics; |
| zx_status_t status = fs_->GetMetrics(&metrics); |
| return fuchsia_minfs_MinfsGetMetrics_reply(transaction, status, |
| status == ZX_OK ? &metrics : nullptr); |
| } |
| |
| zx_status_t VnodeMinfs::ToggleMetrics(bool enable, fidl_txn_t* transaction) { |
| fs_->SetMetrics(enable); |
| return fuchsia_minfs_MinfsToggleMetrics_reply(transaction, ZX_OK); |
| } |
| |
| zx_status_t VnodeMinfs::GetAllocatedRegions(fidl_txn_t* transaction) const { |
| zx::vmo vmo; |
| zx_status_t status = ZX_OK; |
| fbl::Vector<BlockRegion> buffer = fs_->GetAllocatedRegions(); |
| uint64_t allocations = buffer.size(); |
| if (allocations != 0) { |
| status = zx::vmo::create(sizeof(BlockRegion) * allocations, 0, &vmo); |
| if (status == ZX_OK) { |
| status = vmo.write(buffer.get(), 0, sizeof(BlockRegion) * allocations); |
| } |
| } |
| return fuchsia_minfs_MinfsGetAllocatedRegions_reply(transaction, status, |
| status == ZX_OK ? vmo.get() : |
| ZX_HANDLE_INVALID, |
| status == ZX_OK ? allocations : 0); |
| } |
| |
| #endif |
| |
| zx_status_t VnodeMinfs::TruncateInternal(Transaction* transaction, size_t len) { |
| zx_status_t status = ZX_OK; |
| #ifdef __Fuchsia__ |
| // TODO(smklein): We should only init up to 'len'; no need |
| // to read in the portion of a large file we plan on deleting. |
| if ((status = InitVmo(transaction)) != ZX_OK) { |
| FS_TRACE_ERROR("minfs: Truncate failed to initialize VMO: %d\n", status); |
| return ZX_ERR_IO; |
| } |
| #endif |
| |
| uint64_t inode_size = GetSize(); |
| if (len < inode_size) { |
| // Truncate should make the file shorter. |
| blk_t bno = safemath::checked_cast<blk_t>(inode_size / kMinfsBlockSize); |
| |
| // Truncate to the nearest block. |
| blk_t trunc_bno = static_cast<blk_t>(len / kMinfsBlockSize); |
| // [start_bno, EOF) blocks should be deleted entirely. |
| blk_t start_bno = static_cast<blk_t>((len % kMinfsBlockSize == 0) ? |
| trunc_bno : trunc_bno + 1); |
| |
| if ((status = BlocksShrink(transaction, start_bno)) != ZX_OK) { |
| return status; |
| } |
| |
| #ifdef __Fuchsia__ |
| uint64_t decommit_offset = fbl::round_up(len, kMinfsBlockSize); |
| uint64_t decommit_length = fbl::round_up(inode_size, kMinfsBlockSize) - decommit_offset; |
| if (decommit_length > 0) { |
| ZX_ASSERT(vmo_.op_range(ZX_VMO_OP_DECOMMIT, decommit_offset, |
| decommit_length, nullptr, 0) == ZX_OK); |
| } |
| #endif |
| // Shrink the size to be block-aligned if we are removing blocks from |
| // the end of the vnode. |
| if (start_bno * kMinfsBlockSize < inode_size) { |
| SetSize(start_bno * kMinfsBlockSize); |
| } |
| |
| // Write zeroes to the rest of the remaining block, if it exists |
| if (len < GetSize()) { |
| char bdata[kMinfsBlockSize]; |
| blk_t rel_bno = static_cast<blk_t>(len / kMinfsBlockSize); |
| bno = 0; |
| if ((status = BlockGetReadable(rel_bno, &bno)) != ZX_OK) { |
| FS_TRACE_ERROR("minfs: Truncate failed to get block %u of file: %d\n", rel_bno, |
| status); |
| return ZX_ERR_IO; |
| } |
| |
| size_t adjust = len % kMinfsBlockSize; |
| #ifdef __Fuchsia__ |
| bool allocated = (bno != 0); |
| if (allocated || HasPendingAllocation(rel_bno)) { |
| if ((status = vmo_.read(bdata, len - adjust, adjust)) != ZX_OK) { |
| FS_TRACE_ERROR("minfs: Truncate failed to read last block: %d\n", status); |
| return ZX_ERR_IO; |
| } |
| memset(bdata + adjust, 0, kMinfsBlockSize - adjust); |
| |
| if ((status = vmo_.write(bdata, len - adjust, kMinfsBlockSize)) != ZX_OK) { |
| FS_TRACE_ERROR("minfs: Truncate failed to write last block: %d\n", status); |
| return ZX_ERR_IO; |
| } |
| |
| if ((status = BlockGetWritable(transaction, rel_bno, &bno)) != ZX_OK) { |
| FS_TRACE_ERROR("minfs: Truncate failed to get block %u of file: %d\n", rel_bno, |
| status); |
| return ZX_ERR_IO; |
| } |
| IssueWriteback(transaction, rel_bno, bno + fs_->Info().dat_block, 1); |
| } |
| #else // __Fuchsia__ |
| if (bno != 0) { |
| if (fs_->bc_->Readblk(bno + fs_->Info().dat_block, bdata)) { |
| return ZX_ERR_IO; |
| } |
| memset(bdata + adjust, 0, kMinfsBlockSize - adjust); |
| if (fs_->bc_->Writeblk(bno + fs_->Info().dat_block, bdata)) { |
| return ZX_ERR_IO; |
| } |
| } |
| #endif // __Fuchsia__ |
| } |
| } else if (len > inode_size) { |
| // Truncate should make the file longer, filled with zeroes. |
| if (kMinfsMaxFileSize < len) { |
| return ZX_ERR_INVALID_ARGS; |
| } |
| #ifdef __Fuchsia__ |
| uint64_t new_size = fbl::round_up(len, kMinfsBlockSize); |
| if ((status = vmo_.set_size(new_size)) != ZX_OK) { |
| return status; |
| } |
| vmo_size_ = new_size; |
| #endif |
| } else { |
| return ZX_OK; |
| } |
| |
| // Setting the size does not ensure the on-disk inode is updated. Ensuring |
| // writeback occurs is the responsibility of the caller. |
| SetSize(static_cast<uint32_t>(len)); |
| ValidateVmoTail(GetSize()); |
| return ZX_OK; |
| } |
| |
| #ifdef __Fuchsia__ |
| zx_status_t VnodeMinfs::GetNodeInfo(uint32_t flags, fuchsia_io_NodeInfo* info) { |
| if (IsDirectory()) { |
| info->tag = fuchsia_io_NodeInfoTag_directory; |
| } else { |
| info->tag = fuchsia_io_NodeInfoTag_file; |
| } |
| return ZX_OK; |
| } |
| |
| void VnodeMinfs::Sync(SyncCallback closure) { |
| TRACE_DURATION("minfs", "VnodeMinfs::Sync"); |
| fs_->Sync([this, cb = std::move(closure)](zx_status_t status) { |
| if (status != ZX_OK) { |
| cb(status); |
| return; |
| } |
| status = fs_->bc_->Sync(); |
| cb(status); |
| }); |
| return; |
| } |
| |
| zx_status_t VnodeMinfs::AttachRemote(fs::MountChannel h) { |
| if (kMinfsRootIno == ino_) { |
| return ZX_ERR_ACCESS_DENIED; |
| } else if (!IsDirectory() || IsUnlinked()) { |
| return ZX_ERR_NOT_DIR; |
| } else if (IsRemote()) { |
| return ZX_ERR_ALREADY_BOUND; |
| } |
| SetRemote(h.TakeChannel()); |
| return ZX_OK; |
| } |
| #endif |
| |
| VnodeMinfs::DirectArgs VnodeMinfs::IndirectArgs::GetDirect(blk_t* barray, blk_t ibindex) const { |
| // Determine the starting index for direct blocks within this indirect block |
| blk_t direct_start = ibindex == 0 ? bindex_ : 0; |
| |
| // Determine how many direct blocks have already been op'd in indirect block context |
| blk_t offset = 0; |
| |
| if (ibindex) { |
| offset = kMinfsDirectPerIndirect * ibindex - bindex_; |
| } |
| |
| DirectArgs params(op_, // op |
| &barray[direct_start], // array |
| fbl::min(count_ - offset, kMinfsDirectPerIndirect - direct_start), // count |
| rel_bno_ + offset, // rel_bno |
| bnos_ == nullptr ? nullptr : &bnos_[offset]); // bnos |
| return params; |
| } |
| |
| VnodeMinfs::IndirectArgs VnodeMinfs::DindirectArgs::GetIndirect(blk_t* iarray, |
| blk_t dibindex) const { |
| // Determine relative starting indices for indirect and direct blocks |
| uint32_t indirect_start = dibindex == 0 ? ibindex_ : 0; |
| uint32_t direct_start = (dibindex == 0 && indirect_start == ibindex_) ? bindex_ : 0; |
| |
| // Determine how many direct blocks we have already op'd within doubly indirect |
| // context |
| blk_t offset = 0; |
| if (dibindex) { |
| offset = kMinfsDirectPerIndirect * kMinfsDirectPerIndirect * dibindex - |
| (ibindex_ * kMinfsDirectPerIndirect) + bindex_; |
| } |
| |
| IndirectArgs params(op_, // op |
| &iarray[indirect_start], // array |
| fbl::min(count_ - offset, kMinfsDirectPerDindirect - direct_start), // count |
| rel_bno_ + offset, // rel_bno |
| bnos_ == nullptr ? nullptr : &bnos_[offset], // bnos |
| direct_start, // bindex |
| ib_vmo_offset_ + dibindex + ibindex_ // ib_vmo_offset |
| ); |
| return params; |
| } |
| |
| } // namespace minfs |
