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Kernel/Devices: Introduce the LoopDevice device
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.
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12 changed files with 254 additions and 4 deletions
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@ -5,6 +5,7 @@
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*/
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#include <AK/JsonObjectSerializer.h>
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#include <Kernel/Devices/Loop/LoopDevice.h>
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#include <Kernel/FileSystem/FileBackedFileSystem.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Kernel/DiskUsage.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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@ -40,8 +41,15 @@ ErrorOr<void> SysFSDiskUsage::try_generate(KBufferBuilder& builder)
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TRY(fs_object.add("mount_flags"sv, mount.flags()));
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if (fs.is_file_backed()) {
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auto pseudo_path = TRY(static_cast<const FileBackedFileSystem&>(fs).file_description().pseudo_path());
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TRY(fs_object.add("source"sv, pseudo_path->view()));
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auto& file = static_cast<const FileBackedFileSystem&>(fs).file();
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if (file.is_loop_device()) {
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auto& device = static_cast<LoopDevice const&>(file);
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auto path = TRY(device.custody().try_serialize_absolute_path());
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TRY(fs_object.add("source"sv, path->view()));
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} else {
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auto pseudo_path = TRY(static_cast<const FileBackedFileSystem&>(fs).file_description().pseudo_path());
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TRY(fs_object.add("source"sv, pseudo_path->view()));
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}
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} else {
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TRY(fs_object.add("source"sv, "none"));
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}
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