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Kernel: Use KBuffers for ProcFS and SynthFS

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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. :^)
This commit is contained in:
Andreas Kling 2019-08-05 11:35:49 +02:00
parent 6b6b86fbf3
commit 79e22acb22
7 changed files with 58 additions and 43 deletions
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5
Kernel/FileSystem/SyntheticFileSystem.h
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@ -3,6 +3,7 @@
#include <AK/HashMap.h>
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/KBuffer.h>
#include <Kernel/UnixTypes.h>
class SynthFSInode;
@ -75,8 +76,8 @@ private:
String m_name;
InodeIdentifier m_parent;
ByteBuffer m_data;
Function<ByteBuffer(SynthFSInode&)> m_generator;
Optional<KBuffer> m_data;
Function<KBuffer(SynthFSInode&)> m_generator;
Function<ssize_t(SynthFSInode&, const ByteBuffer&)> m_write_callback;
Vector<SynthFSInode*> m_children;
InodeMetadata m_metadata;