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Kernel: Use KBuffers for ProcFS and SynthFS
Instead of generating ByteBuffers and keeping those lying around, have these filesystems generate KBuffers instead. These are way less spooky to leave around for a while. Since FileDescription will keep a generated file buffer around until userspace has read the whole thing, this prevents trivially exhausting the kmalloc heap by opening many files in /proc for example. The code responsible for generating each /proc file is not perfectly efficient and many of them still use ByteBuffers internally but they at least go away when we return now. :^)
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7 changed files with 58 additions and 43 deletions
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@ -3,6 +3,7 @@
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#include <AK/HashMap.h>
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/KBuffer.h>
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#include <Kernel/UnixTypes.h>
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class SynthFSInode;
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@ -75,8 +76,8 @@ private:
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String m_name;
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InodeIdentifier m_parent;
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ByteBuffer m_data;
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Function<ByteBuffer(SynthFSInode&)> m_generator;
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Optional<KBuffer> m_data;
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Function<KBuffer(SynthFSInode&)> m_generator;
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Function<ssize_t(SynthFSInode&, const ByteBuffer&)> m_write_callback;
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Vector<SynthFSInode*> m_children;
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InodeMetadata m_metadata;
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