Kernel: Start work on proper TmpFS in Heap instead of kmalloc memory
This commit is contained in:
parent
8b4e129fc1
commit
99d7b0917d
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@ -28,6 +28,8 @@ set(KERNEL_SOURCES
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kernel/FS/ProcFS/Inode.cpp
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kernel/FS/RamFS/FileSystem.cpp
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kernel/FS/RamFS/Inode.cpp
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kernel/FS/TmpFS/FileSystem.cpp
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kernel/FS/TmpFS/Inode.cpp
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kernel/FS/VirtualFileSystem.cpp
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kernel/Input/PS2Controller.cpp
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kernel/Input/PS2Keyboard.cpp
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@ -0,0 +1,53 @@
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#pragma once
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#include <BAN/Array.h>
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#include <kernel/Memory/Types.h>
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#include <sys/types.h>
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#include <time.h>
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namespace Kernel
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{
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struct TmpInodeInfo
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{
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mode_t mode { 0 };
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uid_t uid { 0 };
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gid_t gid { 0 };
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timespec atime { 0 };
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timespec ctime { 0 };
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timespec mtime { 0 };
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nlink_t nlink { 0 };
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size_t size { 0 };
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blkcnt_t blocks { 0 };
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// 2x direct blocks
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// 1x singly indirect
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// 1x doubly indirect
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// 1x triply indirect
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BAN::Array<paddr_t, 5> block;
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static constexpr size_t direct_block_count = 2;
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static constexpr size_t max_size =
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direct_block_count * PAGE_SIZE +
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(PAGE_SIZE / sizeof(paddr_t)) * PAGE_SIZE +
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(PAGE_SIZE / sizeof(paddr_t)) * (PAGE_SIZE / sizeof(paddr_t)) * PAGE_SIZE +
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(PAGE_SIZE / sizeof(paddr_t)) * (PAGE_SIZE / sizeof(paddr_t)) * (PAGE_SIZE / sizeof(paddr_t)) * PAGE_SIZE;
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};
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static_assert(sizeof(TmpInodeInfo) == 128);
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struct TmpDirectoryEntry
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{
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ino_t ino;
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uint8_t type;
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size_t name_len;
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size_t rec_len;
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char name[];
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BAN::StringView name_sv() const
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{
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ASSERT(type != DT_UNKNOWN);
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return BAN::StringView(name, name_len);
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}
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};
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}
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@ -0,0 +1,119 @@
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#pragma once
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#include <BAN/HashMap.h>
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#include <BAN/Iteration.h>
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#include <kernel/FS/FileSystem.h>
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#include <kernel/FS/TmpFS/Inode.h>
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#include <kernel/SpinLock.h>
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namespace Kernel
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{
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template<typename F>
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concept for_each_indirect_paddr_allocating_callback = requires(F func, paddr_t paddr, bool was_allocated)
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{
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requires BAN::is_same_v<decltype(func(paddr, was_allocated)), BAN::Iteration>;
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};
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class TmpFileSystem : public FileSystem
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{
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public:
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static constexpr size_t no_page_limit = SIZE_MAX;
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public:
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static BAN::ErrorOr<TmpFileSystem*> create(size_t max_pages, mode_t, uid_t, gid_t);
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~TmpFileSystem();
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virtual BAN::RefPtr<Inode> root_inode() override { return m_root_inode; }
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BAN::ErrorOr<BAN::RefPtr<TmpInode>> open_inode(ino_t ino);
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void read_inode(ino_t ino, TmpInodeInfo& out);
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void write_inode(ino_t ino, const TmpInodeInfo&);
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void delete_inode(ino_t ino);
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BAN::ErrorOr<ino_t> allocate_inode(const TmpInodeInfo&);
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void read_block(size_t index, BAN::ByteSpan buffer);
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void write_block(size_t index, BAN::ConstByteSpan buffer);
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void free_block(size_t index);
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BAN::ErrorOr<size_t> allocate_block();
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private:
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struct PageInfo
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{
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enum Flags : paddr_t
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{
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Present = 1 << 0,
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};
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// 12 bottom bits of paddr can be used as flags, since
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// paddr will always be page aligned.
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static constexpr size_t flag_bits = 12;
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static constexpr paddr_t flags_mask = (1 << flag_bits) - 1;
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static constexpr paddr_t paddr_mask = ~flags_mask;
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static_assert((1 << flag_bits) <= PAGE_SIZE);
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paddr_t paddr() const { return raw & paddr_mask; }
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paddr_t flags() const { return raw & flags_mask; }
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void set_paddr(paddr_t paddr) { raw = (raw & flags_mask) | (paddr & paddr_mask); }
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void set_flags(paddr_t flags) { raw = (raw & paddr_mask) | (flags & flags_mask); }
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paddr_t raw { 0 };
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};
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struct InodeLocation
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{
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paddr_t paddr;
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size_t index;
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};
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private:
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TmpFileSystem(size_t max_pages);
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BAN::ErrorOr<void> initialize(mode_t, uid_t, gid_t);
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InodeLocation find_inode(ino_t ino);
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paddr_t find_block(size_t index);
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template<for_each_indirect_paddr_allocating_callback F>
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BAN::ErrorOr<void> for_each_indirect_paddr_allocating(PageInfo page_info, F callback, size_t depth);
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template<for_each_indirect_paddr_allocating_callback F>
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BAN::ErrorOr<BAN::Iteration> for_each_indirect_paddr_allocating_internal(PageInfo page_info, F callback, size_t depth);
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paddr_t find_indirect(PageInfo root, size_t index, size_t depth);
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private:
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RecursiveSpinLock m_lock;
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BAN::HashMap<ino_t, BAN::RefPtr<TmpInode>> m_inode_cache;
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BAN::RefPtr<TmpDirectoryInode> m_root_inode;
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// We store pages with triple indirection.
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// With 64-bit pointers we can store 512^3 pages of data (512 GiB)
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// which should be enough for now.
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// In future this should be dynamically calculated based on maximum
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// number of pages for this file system.
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PageInfo m_data_pages {};
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static constexpr size_t first_data_page = 1;
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static constexpr size_t max_data_pages =
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(PAGE_SIZE / sizeof(PageInfo)) *
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(PAGE_SIZE / sizeof(PageInfo)) *
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(PAGE_SIZE / sizeof(PageInfo));
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// We store inodes in pages with double indirection.
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// With 64-bit pointers we can store 512^2 pages of inodes
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// which should be enough for now.
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// In future this should be dynamically calculated based on maximum
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// number of pages for this file system.
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PageInfo m_inode_pages;
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static constexpr size_t first_inode = 1;
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static constexpr size_t max_inodes =
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(PAGE_SIZE / sizeof(PageInfo)) *
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(PAGE_SIZE / sizeof(PageInfo)) *
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(PAGE_SIZE / sizeof(TmpInodeInfo));
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const size_t m_max_pages;
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};
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}
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@ -0,0 +1,103 @@
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#pragma once
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#include <BAN/Iteration.h>
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#include <kernel/FS/Inode.h>
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#include <kernel/FS/TmpFS/Definitions.h>
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namespace Kernel
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{
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class TmpFileSystem;
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class TmpInode : public Inode
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{
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public:
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virtual ino_t ino() const override final { return m_ino; }
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virtual Mode mode() const override final { return Mode(m_inode_info.mode); }
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virtual nlink_t nlink() const override final { return m_inode_info.nlink; }
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virtual uid_t uid() const override final { return m_inode_info.uid; }
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virtual gid_t gid() const override final { return m_inode_info.gid; }
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virtual off_t size() const override final { return m_inode_info.size; }
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virtual timespec atime() const override final { return m_inode_info.atime; }
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virtual timespec mtime() const override final { return m_inode_info.mtime; }
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virtual timespec ctime() const override final { return m_inode_info.ctime; }
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virtual blksize_t blksize() const override final { return PAGE_SIZE; }
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virtual blkcnt_t blocks() const override final { return m_inode_info.blocks; }
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virtual dev_t dev() const override final { return 0; } // TODO
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virtual dev_t rdev() const override final { return 0; } // TODO
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public:
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static BAN::ErrorOr<BAN::RefPtr<TmpInode>> create_from_existing(TmpFileSystem&, ino_t, const TmpInodeInfo&);
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protected:
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TmpInode(TmpFileSystem&, ino_t, const TmpInodeInfo&);
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void sync();
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void free_all_blocks();
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size_t block_index(size_t data_block_index);
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BAN::ErrorOr<size_t> block_index_with_allocation(size_t data_block_index);
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protected:
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TmpFileSystem& m_fs;
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TmpInodeInfo m_inode_info;
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const ino_t m_ino;
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// has to be able to increase link count
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friend class TmpDirectoryInode;
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};
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class TmpFileInode : public TmpInode
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{
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public:
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static BAN::ErrorOr<BAN::RefPtr<TmpFileInode>> create(TmpFileSystem&, mode_t, uid_t, gid_t);
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~TmpFileInode();
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private:
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TmpFileInode(TmpFileSystem&, ino_t, const TmpInodeInfo&);
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friend class TmpInode;
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};
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class TmpSymlinkInode : public TmpInode
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{
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public:
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~TmpSymlinkInode();
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private:
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TmpSymlinkInode(TmpFileSystem&, ino_t, const TmpInodeInfo&, BAN::StringView target);
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};
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template<typename F>
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concept for_each_entry_callback = requires(F func, const TmpDirectoryEntry& entry)
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{
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requires BAN::is_same_v<decltype(func(entry)), BAN::Iteration>;
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};
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class TmpDirectoryInode : public TmpInode
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{
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public:
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static BAN::ErrorOr<BAN::RefPtr<TmpDirectoryInode>> create_root(TmpFileSystem&, mode_t, uid_t, gid_t);
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static BAN::ErrorOr<BAN::RefPtr<TmpDirectoryInode>> create_new(TmpFileSystem&, mode_t, uid_t, gid_t, TmpInode& parent);
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~TmpDirectoryInode();
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protected:
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virtual BAN::ErrorOr<BAN::RefPtr<Inode>> find_inode_impl(BAN::StringView) override final;
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virtual BAN::ErrorOr<void> list_next_inodes_impl(off_t, DirectoryEntryList*, size_t) override final;
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virtual BAN::ErrorOr<void> create_file_impl(BAN::StringView, mode_t, uid_t, gid_t) override final;
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virtual BAN::ErrorOr<void> create_directory_impl(BAN::StringView, mode_t, uid_t, gid_t) override final;
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virtual BAN::ErrorOr<void> unlink_impl(BAN::StringView) override final;
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private:
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TmpDirectoryInode(TmpFileSystem&, ino_t, const TmpInodeInfo&);
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BAN::ErrorOr<void> link_inode(TmpInode&, BAN::StringView);
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template<for_each_entry_callback F>
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void for_each_entry(F callback);
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friend class TmpInode;
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};
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}
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@ -0,0 +1,268 @@
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#include <kernel/FS/TmpFS/FileSystem.h>
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#include <kernel/Memory/Heap.h>
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#include <kernel/Memory/PageTable.h>
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namespace Kernel
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{
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BAN::ErrorOr<TmpFileSystem*> TmpFileSystem::create(size_t max_pages, mode_t mode, uid_t uid, gid_t gid)
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{
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auto* result = new TmpFileSystem(max_pages);
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if (result == nullptr)
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return BAN::Error::from_errno(ENOMEM);
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TRY(result->initialize(mode, uid, gid));
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return result;
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}
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TmpFileSystem::TmpFileSystem(size_t max_pages)
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: m_max_pages(max_pages)
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{ }
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BAN::ErrorOr<void> TmpFileSystem::initialize(mode_t mode, uid_t uid, gid_t gid)
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{
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paddr_t data_paddr = Heap::get().take_free_page();
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if (data_paddr == 0)
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return BAN::Error::from_errno(ENOMEM);
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m_data_pages.set_paddr(data_paddr);
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m_data_pages.set_flags(PageInfo::Flags::Present);
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PageTable::with_fast_page(data_paddr, [&] {
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memset(PageTable::fast_page_as_ptr(), 0x00, PAGE_SIZE);
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});
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paddr_t inodes_paddr = Heap::get().take_free_page();
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if (inodes_paddr == 0)
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return BAN::Error::from_errno(ENOMEM);
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m_inode_pages.set_paddr(inodes_paddr);
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m_inode_pages.set_flags(PageInfo::Flags::Present);
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PageTable::with_fast_page(inodes_paddr, [&] {
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memset(PageTable::fast_page_as_ptr(), 0x00, PAGE_SIZE);
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});
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m_root_inode = TRY(TmpDirectoryInode::create_root(*this, mode, uid, gid));
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TRY(m_inode_cache.insert(m_root_inode->ino(), m_root_inode));
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return {};
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}
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TmpFileSystem::~TmpFileSystem()
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{
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ASSERT_NOT_REACHED();
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}
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BAN::ErrorOr<BAN::RefPtr<TmpInode>> TmpFileSystem::open_inode(ino_t ino)
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{
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if (m_inode_cache.contains(ino))
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return m_inode_cache[ino];
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TmpInodeInfo inode_info;
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auto inode_location = find_inode(ino);
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PageTable::with_fast_page(inode_location.paddr, [&] {
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inode_info = PageTable::fast_page_as_sized<TmpInodeInfo>(inode_location.index);
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});
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auto inode = TRY(TmpInode::create_from_existing(*this, ino, inode_info));
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TRY(m_inode_cache.insert(ino, inode));
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return inode;
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}
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void TmpFileSystem::read_inode(ino_t ino, TmpInodeInfo& out)
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{
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auto inode_location = find_inode(ino);
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PageTable::with_fast_page(inode_location.paddr, [&] {
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out = PageTable::fast_page_as_sized<TmpInodeInfo>(inode_location.index);
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});
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}
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void TmpFileSystem::write_inode(ino_t ino, const TmpInodeInfo& info)
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{
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auto inode_location = find_inode(ino);
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PageTable::with_fast_page(inode_location.paddr, [&] {
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auto& inode_info = PageTable::fast_page_as_sized<TmpInodeInfo>(inode_location.index);
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inode_info = info;
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});
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}
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void TmpFileSystem::delete_inode(ino_t ino)
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{
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auto inode_location = find_inode(ino);
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PageTable::with_fast_page(inode_location.paddr, [&] {
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auto& inode_info = PageTable::fast_page_as_sized<TmpInodeInfo>(inode_location.index);
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ASSERT_EQ(inode_info.nlink, 0);
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for (auto paddr : inode_info.block)
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ASSERT_EQ(paddr, 0);
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inode_info = {};
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});
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}
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BAN::ErrorOr<ino_t> TmpFileSystem::allocate_inode(const TmpInodeInfo& info)
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{
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constexpr size_t inodes_per_page = PAGE_SIZE / sizeof(TmpInodeInfo);
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ino_t ino = first_inode;
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TRY(for_each_indirect_paddr_allocating(m_inode_pages, [&](paddr_t paddr, bool) {
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BAN::Iteration result = BAN::Iteration::Continue;
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PageTable::with_fast_page(paddr, [&] {
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for (size_t i = 0; i < inodes_per_page; i++, ino++)
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{
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auto& inode_info = PageTable::fast_page_as_sized<TmpInodeInfo>(i);
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if (inode_info.mode != 0)
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continue;
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inode_info = info;
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result = BAN::Iteration::Break;
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return;
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}
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});
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return result;
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}, 2));
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return ino;
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}
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TmpFileSystem::InodeLocation TmpFileSystem::find_inode(ino_t ino)
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{
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ASSERT_GTE(ino, first_inode);
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ASSERT_LT(ino, max_inodes);
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constexpr size_t inodes_per_page = PAGE_SIZE / sizeof(TmpInodeInfo);
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size_t index_of_page = (ino - first_inode) / inodes_per_page;
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size_t index_in_page = (ino - first_inode) % inodes_per_page;
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return {
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.paddr = find_indirect(m_inode_pages, index_of_page, 2),
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.index = index_in_page
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};
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}
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void TmpFileSystem::read_block(size_t index, BAN::ByteSpan buffer)
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{
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ASSERT(buffer.size() >= PAGE_SIZE);
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paddr_t block_paddr = find_block(index);
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PageTable::with_fast_page(block_paddr, [&] {
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memcpy(buffer.data(), PageTable::fast_page_as_ptr(), PAGE_SIZE);
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});
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}
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void TmpFileSystem::write_block(size_t index, BAN::ConstByteSpan buffer)
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{
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ASSERT(buffer.size() >= PAGE_SIZE);
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paddr_t block_paddr = find_block(index);
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PageTable::with_fast_page(block_paddr, [&] {
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memcpy(PageTable::fast_page_as_ptr(), buffer.data(), PAGE_SIZE);
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});
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}
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void TmpFileSystem::free_block(size_t index)
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{
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ASSERT_NOT_REACHED();
|
||||
}
|
||||
|
||||
BAN::ErrorOr<size_t> TmpFileSystem::allocate_block()
|
||||
{
|
||||
size_t result = first_data_page;
|
||||
TRY(for_each_indirect_paddr_allocating(m_data_pages, [&] (paddr_t paddr, bool allocated) {
|
||||
if (allocated)
|
||||
return BAN::Iteration::Break;
|
||||
result++;
|
||||
return BAN::Iteration::Continue;
|
||||
}, 3));
|
||||
return result;
|
||||
}
|
||||
|
||||
paddr_t TmpFileSystem::find_block(size_t index)
|
||||
{
|
||||
ASSERT_GT(index, 0);
|
||||
return find_indirect(m_data_pages, index - first_data_page, 3);
|
||||
}
|
||||
|
||||
paddr_t TmpFileSystem::find_indirect(PageInfo root, size_t index, size_t depth)
|
||||
{
|
||||
ASSERT(root.flags() & PageInfo::Flags::Present);
|
||||
if (depth == 0)
|
||||
return root.paddr();
|
||||
|
||||
constexpr size_t addresses_per_page = PAGE_SIZE / sizeof(PageInfo);
|
||||
|
||||
size_t divisor = 1;
|
||||
for (size_t i = 0; i < depth; i++)
|
||||
divisor *= addresses_per_page;
|
||||
|
||||
size_t index_of_page = index / divisor;
|
||||
size_t index_in_page = index % divisor;
|
||||
|
||||
ASSERT(index_of_page < addresses_per_page);
|
||||
|
||||
PageInfo next;
|
||||
PageTable::with_fast_page(root.paddr(), [&] {
|
||||
next = PageTable::fast_page_as_sized<PageInfo>(index_of_page);
|
||||
});
|
||||
|
||||
return find_indirect(next, index_in_page, depth - 1);
|
||||
}
|
||||
|
||||
template<for_each_indirect_paddr_allocating_callback F>
|
||||
BAN::ErrorOr<BAN::Iteration> TmpFileSystem::for_each_indirect_paddr_allocating_internal(PageInfo page_info, F callback, size_t depth)
|
||||
{
|
||||
ASSERT_GT(depth, 0);
|
||||
ASSERT(page_info.flags() & PageInfo::Flags::Present);
|
||||
|
||||
for (size_t i = 0; i < PAGE_SIZE / sizeof(PageInfo); i++)
|
||||
{
|
||||
PageInfo next_info;
|
||||
PageTable::with_fast_page(page_info.paddr(), [&] {
|
||||
next_info = PageTable::fast_page_as_sized<PageInfo>(i);
|
||||
});
|
||||
|
||||
bool allocated = false;
|
||||
|
||||
if (!(next_info.flags() & PageInfo::Flags::Present))
|
||||
{
|
||||
paddr_t new_paddr = Heap::get().take_free_page();
|
||||
if (new_paddr == 0)
|
||||
return BAN::Error::from_errno(ENOMEM);
|
||||
|
||||
PageTable::with_fast_page(new_paddr, [&] {
|
||||
memset(PageTable::fast_page_as_ptr(), 0x00, PAGE_SIZE);
|
||||
});
|
||||
|
||||
next_info.set_paddr(new_paddr);
|
||||
next_info.set_flags(PageInfo::Flags::Present);
|
||||
|
||||
PageTable::with_fast_page(page_info.paddr(), [&] {
|
||||
auto& to_update_info = PageTable::fast_page_as_sized<PageInfo>(i);
|
||||
to_update_info = next_info;
|
||||
});
|
||||
|
||||
allocated = true;
|
||||
}
|
||||
|
||||
BAN::Iteration result;
|
||||
if (depth == 1)
|
||||
result = callback(next_info.paddr(), allocated);
|
||||
else
|
||||
result = TRY(for_each_indirect_paddr_allocating_internal(next_info, callback, depth - 1));
|
||||
|
||||
switch (result)
|
||||
{
|
||||
case BAN::Iteration::Continue:
|
||||
break;
|
||||
case BAN::Iteration::Break:
|
||||
return BAN::Iteration::Break;
|
||||
default:
|
||||
ASSERT_NOT_REACHED();
|
||||
}
|
||||
}
|
||||
|
||||
return BAN::Iteration::Continue;
|
||||
}
|
||||
|
||||
template<for_each_indirect_paddr_allocating_callback F>
|
||||
BAN::ErrorOr<void> TmpFileSystem::for_each_indirect_paddr_allocating(PageInfo page_info, F callback, size_t depth)
|
||||
{
|
||||
BAN::Iteration result = TRY(for_each_indirect_paddr_allocating_internal(page_info, callback, depth));
|
||||
ASSERT(result == BAN::Iteration::Break);
|
||||
return {};
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -0,0 +1,303 @@
|
|||
#include <kernel/FS/TmpFS/FileSystem.h>
|
||||
#include <kernel/FS/TmpFS/Inode.h>
|
||||
#include <kernel/Timer/Timer.h>
|
||||
|
||||
namespace Kernel
|
||||
{
|
||||
|
||||
static TmpInodeInfo create_inode_info(mode_t mode, uid_t uid, gid_t gid)
|
||||
{
|
||||
auto current_time = SystemTimer::get().real_time();
|
||||
|
||||
TmpInodeInfo info;
|
||||
info.uid = uid;
|
||||
info.gid = gid;
|
||||
info.mode = mode;
|
||||
info.atime = current_time;
|
||||
info.mtime = current_time;
|
||||
info.ctime = current_time;
|
||||
|
||||
return info;
|
||||
}
|
||||
|
||||
static uint8_t inode_mode_to_dt_type(Inode::Mode mode)
|
||||
{
|
||||
if (mode.ifreg())
|
||||
return DT_REG;
|
||||
if (mode.ifdir())
|
||||
return DT_DIR;
|
||||
if (mode.ifchr())
|
||||
return DT_CHR;
|
||||
if (mode.ifblk())
|
||||
return DT_BLK;
|
||||
if (mode.ififo())
|
||||
return DT_FIFO;
|
||||
if (mode.ifsock())
|
||||
return DT_SOCK;
|
||||
if (mode.iflnk())
|
||||
return DT_LNK;
|
||||
ASSERT_NOT_REACHED();
|
||||
}
|
||||
|
||||
/* GENERAL INODE */
|
||||
|
||||
BAN::ErrorOr<BAN::RefPtr<TmpInode>> TmpInode::create_from_existing(TmpFileSystem& fs, ino_t ino, const TmpInodeInfo& info)
|
||||
{
|
||||
TmpInode* inode_ptr = nullptr;
|
||||
switch (info.mode & Mode::TYPE_MASK)
|
||||
{
|
||||
case Mode::IFDIR:
|
||||
inode_ptr = new TmpDirectoryInode(fs, ino, info);
|
||||
break;
|
||||
case Mode::IFREG:
|
||||
inode_ptr = new TmpFileInode(fs, ino, info);
|
||||
break;
|
||||
default:
|
||||
ASSERT_NOT_REACHED();
|
||||
}
|
||||
if (inode_ptr == nullptr)
|
||||
return BAN::Error::from_errno(ENOMEM);
|
||||
return BAN::RefPtr<TmpInode>::adopt(inode_ptr);
|
||||
}
|
||||
|
||||
TmpInode::TmpInode(TmpFileSystem& fs, ino_t ino, const TmpInodeInfo& info)
|
||||
: m_fs(fs)
|
||||
, m_inode_info(info)
|
||||
, m_ino(ino)
|
||||
{}
|
||||
|
||||
void TmpInode::sync()
|
||||
{
|
||||
m_fs.write_inode(m_ino, m_inode_info);
|
||||
}
|
||||
|
||||
void TmpInode::free_all_blocks()
|
||||
{
|
||||
for (auto block : m_inode_info.block)
|
||||
ASSERT(block == 0);
|
||||
}
|
||||
|
||||
size_t TmpInode::block_index(size_t data_block_index)
|
||||
{
|
||||
ASSERT(data_block_index < TmpInodeInfo::direct_block_count);
|
||||
ASSERT(m_inode_info.block[data_block_index]);
|
||||
return m_inode_info.block[data_block_index];
|
||||
}
|
||||
|
||||
BAN::ErrorOr<size_t> TmpInode::block_index_with_allocation(size_t data_block_index)
|
||||
{
|
||||
if (data_block_index >= TmpInodeInfo::direct_block_count)
|
||||
{
|
||||
dprintln("only {} blocks supported :D", TmpInodeInfo::direct_block_count);
|
||||
return BAN::Error::from_errno(ENOSPC);
|
||||
}
|
||||
if (m_inode_info.block[data_block_index] == 0)
|
||||
{
|
||||
m_inode_info.block[data_block_index] = TRY(m_fs.allocate_block());
|
||||
m_inode_info.blocks++;
|
||||
}
|
||||
return m_inode_info.block[data_block_index];
|
||||
}
|
||||
|
||||
/* FILE INODE */
|
||||
|
||||
BAN::ErrorOr<BAN::RefPtr<TmpFileInode>> TmpFileInode::create(TmpFileSystem& fs, mode_t mode, uid_t uid, gid_t gid)
|
||||
{
|
||||
auto info = create_inode_info(Mode::IFREG | mode, uid, gid);
|
||||
ino_t ino = TRY(fs.allocate_inode(info));
|
||||
|
||||
auto* inode_ptr = new TmpFileInode(fs, ino, info);
|
||||
if (inode_ptr == nullptr)
|
||||
return BAN::Error::from_errno(ENOMEM);
|
||||
|
||||
return BAN::RefPtr<TmpFileInode>::adopt(inode_ptr);
|
||||
}
|
||||
|
||||
TmpFileInode::TmpFileInode(TmpFileSystem& fs, ino_t ino, const TmpInodeInfo& info)
|
||||
: TmpInode(fs, ino, info)
|
||||
{
|
||||
ASSERT(mode().ifreg());
|
||||
}
|
||||
|
||||
TmpFileInode::~TmpFileInode()
|
||||
{
|
||||
if (nlink() > 0)
|
||||
{
|
||||
sync();
|
||||
return;
|
||||
}
|
||||
free_all_blocks();
|
||||
m_fs.delete_inode(ino());
|
||||
}
|
||||
|
||||
/* DIRECTORY INODE */
|
||||
|
||||
BAN::ErrorOr<BAN::RefPtr<TmpDirectoryInode>> TmpDirectoryInode::create_root(TmpFileSystem& fs, mode_t mode, uid_t uid, gid_t gid)
|
||||
{
|
||||
auto info = create_inode_info(Mode::IFDIR | mode, uid, gid);
|
||||
ino_t ino = TRY(fs.allocate_inode(info));
|
||||
|
||||
auto* inode_ptr = new TmpDirectoryInode(fs, ino, info);
|
||||
if (inode_ptr == nullptr)
|
||||
return BAN::Error::from_errno(ENOMEM);
|
||||
|
||||
auto inode = BAN::RefPtr<TmpDirectoryInode>::adopt(inode_ptr);
|
||||
TRY(inode->link_inode(*inode, "."sv));
|
||||
TRY(inode->link_inode(*inode, ".."sv));
|
||||
|
||||
return inode;
|
||||
}
|
||||
|
||||
BAN::ErrorOr<BAN::RefPtr<TmpDirectoryInode>> TmpDirectoryInode::create_new(TmpFileSystem& fs, mode_t mode, uid_t uid, gid_t gid, TmpInode& parent)
|
||||
{
|
||||
auto info = create_inode_info(Mode::IFDIR | mode, uid, gid);
|
||||
ino_t ino = TRY(fs.allocate_inode(info));
|
||||
|
||||
auto* inode_ptr = new TmpDirectoryInode(fs, ino, info);
|
||||
if (inode_ptr == nullptr)
|
||||
return BAN::Error::from_errno(ENOMEM);
|
||||
|
||||
auto inode = BAN::RefPtr<TmpDirectoryInode>::adopt(inode_ptr);
|
||||
TRY(inode->link_inode(*inode, "."sv));
|
||||
TRY(inode->link_inode(parent, "."sv));
|
||||
|
||||
return inode;
|
||||
}
|
||||
|
||||
TmpDirectoryInode::TmpDirectoryInode(TmpFileSystem& fs, ino_t ino, const TmpInodeInfo& info)
|
||||
: TmpInode(fs, ino, info)
|
||||
{
|
||||
ASSERT(mode().ifdir());
|
||||
}
|
||||
|
||||
TmpDirectoryInode::~TmpDirectoryInode()
|
||||
{
|
||||
if (nlink() >= 2)
|
||||
{
|
||||
sync();
|
||||
return;
|
||||
}
|
||||
free_all_blocks();
|
||||
m_fs.delete_inode(ino());
|
||||
}
|
||||
|
||||
BAN::ErrorOr<BAN::RefPtr<Inode>> TmpDirectoryInode::find_inode_impl(BAN::StringView name)
|
||||
{
|
||||
ino_t result = 0;
|
||||
|
||||
for_each_entry([&](const TmpDirectoryEntry& entry) {
|
||||
if (entry.type == DT_UNKNOWN)
|
||||
return BAN::Iteration::Continue;
|
||||
if (entry.name_sv() != name)
|
||||
return BAN::Iteration::Continue;
|
||||
result = entry.ino;
|
||||
return BAN::Iteration::Break;
|
||||
});
|
||||
|
||||
if (result == 0)
|
||||
return BAN::Error::from_errno(ENOENT);
|
||||
|
||||
auto inode = TRY(m_fs.open_inode(result));
|
||||
return BAN::RefPtr<Inode>(inode);
|
||||
}
|
||||
|
||||
BAN::ErrorOr<void> TmpDirectoryInode::list_next_inodes_impl(off_t, DirectoryEntryList*, size_t)
|
||||
{
|
||||
return BAN::Error::from_errno(ENOTSUP);
|
||||
}
|
||||
|
||||
BAN::ErrorOr<void> TmpDirectoryInode::create_file_impl(BAN::StringView name, mode_t mode, uid_t uid, gid_t gid)
|
||||
{
|
||||
auto new_inode = TRY(TmpFileInode::create(m_fs, mode, uid, gid));
|
||||
TRY(link_inode(*new_inode, name));
|
||||
return {};
|
||||
}
|
||||
|
||||
BAN::ErrorOr<void> TmpDirectoryInode::create_directory_impl(BAN::StringView name, mode_t mode, uid_t uid, gid_t gid)
|
||||
{
|
||||
auto new_inode = TRY(TmpDirectoryInode::create_new(m_fs, mode, uid, gid, *this));
|
||||
TRY(link_inode(*new_inode, name));
|
||||
return {};
|
||||
}
|
||||
|
||||
BAN::ErrorOr<void> TmpDirectoryInode::unlink_impl(BAN::StringView)
|
||||
{
|
||||
return BAN::Error::from_errno(ENOTSUP);
|
||||
}
|
||||
|
||||
BAN::ErrorOr<void> TmpDirectoryInode::link_inode(TmpInode& inode, BAN::StringView name)
|
||||
{
|
||||
static constexpr size_t directory_entry_alignment = 16;
|
||||
|
||||
size_t current_size = size();
|
||||
|
||||
size_t new_entry_size = sizeof(TmpDirectoryEntry) + name.size();
|
||||
if (auto rem = new_entry_size % directory_entry_alignment)
|
||||
new_entry_size += directory_entry_alignment - rem;
|
||||
ASSERT(new_entry_size < (size_t)blksize());
|
||||
|
||||
size_t new_entry_offset = current_size % blksize();
|
||||
|
||||
// Target is the last block, or if it doesn't fit the new entry, the next one.
|
||||
size_t target_data_block = current_size / blksize();
|
||||
if (blksize() - new_entry_offset < new_entry_size)
|
||||
target_data_block++;
|
||||
|
||||
size_t block_index = TRY(block_index_with_allocation(target_data_block));
|
||||
|
||||
BAN::Vector<uint8_t> buffer;
|
||||
TRY(buffer.resize(blksize()));
|
||||
|
||||
BAN::ByteSpan bytespan = buffer.span();
|
||||
|
||||
m_fs.read_block(block_index, bytespan);
|
||||
|
||||
auto& new_entry = bytespan.slice(new_entry_offset).as<TmpDirectoryEntry>();
|
||||
new_entry.type = inode_mode_to_dt_type(inode.mode());
|
||||
new_entry.ino = inode.ino();
|
||||
new_entry.name_len = name.size();
|
||||
new_entry.rec_len = new_entry_size;
|
||||
memcpy(new_entry.name, name.data(), name.size());
|
||||
|
||||
m_fs.write_block(block_index, bytespan);
|
||||
|
||||
// increase current size
|
||||
m_inode_info.size += new_entry_size;
|
||||
|
||||
// add link to linked inode
|
||||
inode.m_inode_info.nlink++;
|
||||
|
||||
return {};
|
||||
}
|
||||
|
||||
template<for_each_entry_callback F>
|
||||
void TmpDirectoryInode::for_each_entry(F callback)
|
||||
{
|
||||
size_t full_offset = 0;
|
||||
while (full_offset < (size_t)size())
|
||||
{
|
||||
size_t data_block_index = full_offset / blksize();
|
||||
size_t block_index = this->block_index(data_block_index);
|
||||
|
||||
// FIXME: implement fast heap pages?
|
||||
BAN::Vector<uint8_t> buffer;
|
||||
MUST(buffer.resize(blksize()));
|
||||
|
||||
BAN::ByteSpan bytespan = buffer.span();
|
||||
m_fs.read_block(block_index, bytespan);
|
||||
|
||||
size_t byte_count = BAN::Math::min<size_t>(blksize(), size() - full_offset);
|
||||
|
||||
bytespan = bytespan.slice(0, byte_count);
|
||||
while (bytespan.size() > 0)
|
||||
{
|
||||
auto& entry = bytespan.as<TmpDirectoryEntry>();
|
||||
callback(entry);
|
||||
bytespan = bytespan.slice(entry.rec_len);
|
||||
}
|
||||
|
||||
full_offset += blksize();
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue