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ladybird/Kernel/FileSystem/FileBackedFileSystem.h

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Meta: Add license header to source files As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
Import all this stuff into a single repo called Serenity.
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#pragma once
Kernel: Change Ext2FS to be backed by a file instead of a block device In contrast to the previous patchset that was reverted, this time we use a "special" method to access a file with block size of 512 bytes (like a harddrive essentially).
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#include <Kernel/FileSystem/FileDescription.h>
Kernel: Add forward declaration header
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#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/Forward.h>
Import all this stuff into a single repo called Serenity.
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Kernel: Move all code into the Kernel namespace
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namespace Kernel {
Kernel: Change Ext2FS to be backed by a file instead of a block device In contrast to the previous patchset that was reverted, this time we use a "special" method to access a file with block size of 512 bytes (like a harddrive essentially).
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class FileBackedFS : public FS {
Import all this stuff into a single repo called Serenity.
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public:
Kernel: Change Ext2FS to be backed by a file instead of a block device In contrast to the previous patchset that was reverted, this time we use a "special" method to access a file with block size of 512 bytes (like a harddrive essentially).
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virtual ~FileBackedFS() override;
Import all this stuff into a single repo called Serenity.
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Kernel: Change Ext2FS to be backed by a file instead of a block device In contrast to the previous patchset that was reverted, this time we use a "special" method to access a file with block size of 512 bytes (like a harddrive essentially).
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File& file() { return m_file_description->file(); }
FileDescription& file_description() { return *m_file_description; }
const File& file() const { return m_file_description->file(); }
const FileDescription& file_description() const { return *m_file_description; }
Import all this stuff into a single repo called Serenity.
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Kernel: Add a write cache to DiskBackedFS. This way you can spam small write()s on a file without the kernel writing to disk every single time. Flushes are included in the FS::sync() operation and will get triggered regularly by syncd. :^)
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virtual void flush_writes() override;
Kernel: Fick infinite recursion when filling up disk cache We can't be calling the virtual FS::flush_writes() in order to flush the disk cache from within the disk cache, since an FS subclass may try to do cache stuff in its flush_writes() implementation. Instead, separate out the implementation of DiskBackedFS's flushing logic into a flush_writes_impl() and call that from the cache code.
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void flush_writes_impl();
Kernel: Change Ext2FS to be backed by a file instead of a block device In contrast to the previous patchset that was reverted, this time we use a "special" method to access a file with block size of 512 bytes (like a harddrive essentially).
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size_t logical_block_size() const { return m_logical_block_size; };
Import all this stuff into a single repo called Serenity.
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protected:
Kernel: Change Ext2FS to be backed by a file instead of a block device In contrast to the previous patchset that was reverted, this time we use a "special" method to access a file with block size of 512 bytes (like a harddrive essentially).
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explicit FileBackedFS(FileDescription&);
Import all this stuff into a single repo called Serenity.
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Kernel: Tweak FileBackedFS API to avoid intermediary copies read_block() and write_block() now accept the count (how many bytes to read or write) and offset (where in the block to start; defaults to 0). Using these new APIs, we can avoid doing copies between intermediary buffers in a lot more cases. Hopefully this improves performance or something.
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bool read_block(unsigned index, u8* buffer, size_t count, size_t offset = 0, bool allow_cache = true) const;
bool read_blocks(unsigned index, unsigned count, u8* buffer, bool allow_cache = true) const;
Import all this stuff into a single repo called Serenity.
2018-10-10 09:53:07 +00:00
Kernel: Change Ext2FS to be backed by a file instead of a block device In contrast to the previous patchset that was reverted, this time we use a "special" method to access a file with block size of 512 bytes (like a harddrive essentially).
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bool raw_read(unsigned index, u8* buffer);
bool raw_write(unsigned index, const u8* buffer);
Kernel: Ensure we flush the entire ext2 superblock
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bool raw_read_blocks(unsigned index, size_t count, u8* buffer);
bool raw_write_blocks(unsigned index, size_t count, const u8* buffer);
Kernel: Tweak FileBackedFS API to avoid intermediary copies read_block() and write_block() now accept the count (how many bytes to read or write) and offset (where in the block to start; defaults to 0). Using these new APIs, we can avoid doing copies between intermediary buffers in a lot more cases. Hopefully this improves performance or something.
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bool write_block(unsigned index, const u8* buffer, size_t count, size_t offset = 0, bool allow_cache = true);
bool write_blocks(unsigned index, unsigned count, const u8*, bool allow_cache = true);
Import all this stuff into a single repo called Serenity.
2018-10-10 09:53:07 +00:00
Kernel: Change Ext2FS to be backed by a file instead of a block device In contrast to the previous patchset that was reverted, this time we use a "special" method to access a file with block size of 512 bytes (like a harddrive essentially).
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size_t m_logical_block_size { 512 };
Import all this stuff into a single repo called Serenity.
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private:
Kernel: Tweak FileBackedFS API to avoid intermediary copies read_block() and write_block() now accept the count (how many bytes to read or write) and offset (where in the block to start; defaults to 0). Using these new APIs, we can avoid doing copies between intermediary buffers in a lot more cases. Hopefully this improves performance or something.
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virtual bool is_file_backed() const override { return true; }
Kernel: Implement a simpler, bigger cache for DiskBackedFS The hashmap cache was ridiculously slow and hurt us more than it helped us. This patch replaces it with a flat memory cache that keeps up to 10'000 blocks in cache with a simple dirty bit. The syncd task will wake up periodically and call flush_writes() on all file systems, which now causes us to traverse the cache and write all dirty blocks to disk. There's a ton of room for improvement here, but this itself is already drastically better when doing repeated GCC invocations.
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DiskCache& cache() const;
Kernel: Implement O_DIRECT open() flag to bypass disk caches Files opened with O_DIRECT will now bypass the disk cache in read/write operations (though metadata operations will still hit the disk cache.) This will allow us to test actual disk performance instead of testing disk *cache* performance, if that's what we want. :^) There's room for improvment here, we're very aggressively flushing any dirty cache entries for the specific block before reading/writing that block. This is done by walking the entire cache, which may be slow.
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void flush_specific_block_if_needed(unsigned index);
Kernel: Implement a simpler, bigger cache for DiskBackedFS The hashmap cache was ridiculously slow and hurt us more than it helped us. This patch replaces it with a flat memory cache that keeps up to 10'000 blocks in cache with a simple dirty bit. The syncd task will wake up periodically and call flush_writes() on all file systems, which now causes us to traverse the cache and write all dirty blocks to disk. There's a ton of room for improvement here, but this itself is already drastically better when doing repeated GCC invocations.
2019-09-30 08:31:06 +00:00
Kernel: Tweak FileBackedFS API to avoid intermediary copies read_block() and write_block() now accept the count (how many bytes to read or write) and offset (where in the block to start; defaults to 0). Using these new APIs, we can avoid doing copies between intermediary buffers in a lot more cases. Hopefully this improves performance or something.
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mutable NonnullRefPtr<FileDescription> m_file_description;
Kernel: Implement a simpler, bigger cache for DiskBackedFS The hashmap cache was ridiculously slow and hurt us more than it helped us. This patch replaces it with a flat memory cache that keeps up to 10'000 blocks in cache with a simple dirty bit. The syncd task will wake up periodically and call flush_writes() on all file systems, which now causes us to traverse the cache and write all dirty blocks to disk. There's a ton of room for improvement here, but this itself is already drastically better when doing repeated GCC invocations.
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mutable OwnPtr<DiskCache> m_cache;
Import all this stuff into a single repo called Serenity.
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};
Kernel: Move all code into the Kernel namespace
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}
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