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Kernel/Devices: Introduce the LoopDevice device

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This device is a block device that allows a user to effectively treat an
Inode as a block device.

The static construction method is given an OpenFileDescription reference
but validates that:
- The description has a valid custody (so it's not some arbitrary file).
  Failing this requirement will yield EINVAL.
- The description custody points to an Inode which is a regular file, as
  we only support (seekable) regular files. Failing this requirement
  will yield ENOTSUP.

LoopDevice can be used to mount a regular file on the filesystem like
other supported types of (physical) block devices.
This commit is contained in:
Liav A 2024-02-23 17:11:48 +02:00 • committed by Andrew Kaster
commit 5dcf03ad9a
Notes: sideshowbarker 2024-07-16 19:42:24 +09:00
12 changed files with 254 additions and 4 deletions
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1
Kernel/FileSystem/Ext2FS/FileSystem.h
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@ -47,6 +47,7 @@ public:
virtual unsigned free_inode_count() const override;
virtual bool supports_watchers() const override { return true; }
virtual bool supports_backing_loop_devices() const override { return true; }
virtual u8 internal_file_type_to_directory_entry_type(DirectoryEntryView const& entry) const override;