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Kernel/FileSystem: Enforce locking of m_inode_lock when truncating Inode
Such operation is almost equivalent to writing on an Inode, so lock the Inode m_inode_lock exclusively. All FileSystem Inode implementations then override a new method called truncate_locked which should implement the actual truncating.
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13 changed files with 23 additions and 14 deletions
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@ -1071,9 +1071,9 @@ ErrorOr<void> Ext2FSInode::chown(UserID uid, GroupID gid)
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return {};
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}
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ErrorOr<void> Ext2FSInode::truncate(u64 size)
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ErrorOr<void> Ext2FSInode::truncate_locked(u64 size)
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{
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MutexLocker locker(m_inode_lock);
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VERIFY(m_inode_lock.is_locked());
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if (static_cast<u64>(m_raw_inode.i_size) == size)
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return {};
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TRY(resize(size));
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@ -42,7 +42,7 @@ private:
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virtual ErrorOr<void> decrement_link_count() override;
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virtual ErrorOr<void> chmod(mode_t) override;
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virtual ErrorOr<void> chown(UserID, GroupID) override;
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virtual ErrorOr<void> truncate(u64) override;
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virtual ErrorOr<void> truncate_locked(u64) override;
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virtual ErrorOr<int> get_block_address(int) override;
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ErrorOr<void> write_directory(Vector<Ext2FSDirectoryEntry>&);
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