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https://github.com/SerenityOS/serenity
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949aef4aef
This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
122 lines
3.8 KiB
C++
122 lines
3.8 KiB
C++
#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/DevPtsFS.h>
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#include <Kernel/FileSystem/Ext2FileSystem.h>
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#include <Kernel/FileSystem/Plan9FileSystem.h>
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#include <Kernel/FileSystem/ProcFS.h>
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#include <Kernel/FileSystem/TmpFS.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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int Process::sys$mount(const Syscall::SC_mount_params* user_params)
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{
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if (!is_superuser())
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return -EPERM;
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REQUIRE_NO_PROMISES;
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Syscall::SC_mount_params params;
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if (!validate_read_and_copy_typed(¶ms, user_params))
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return -EFAULT;
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auto source_fd = params.source_fd;
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auto target = validate_and_copy_string_from_user(params.target);
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auto fs_type = validate_and_copy_string_from_user(params.fs_type);
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if (target.is_null())
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return -EFAULT;
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auto description = file_description(source_fd);
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if (!description.is_null())
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dbg() << "mount " << fs_type << ": source fd " << source_fd << " @ " << target;
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else
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dbg() << "mount " << fs_type << " @ " << target;
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auto custody_or_error = VFS::the().resolve_path(target, current_directory());
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if (custody_or_error.is_error())
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return custody_or_error.error();
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auto& target_custody = custody_or_error.value();
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if (params.flags & MS_REMOUNT) {
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// We're not creating a new mount, we're updating an existing one!
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return VFS::the().remount(target_custody, params.flags & ~MS_REMOUNT);
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}
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if (params.flags & MS_BIND) {
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// We're doing a bind mount.
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if (description.is_null())
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return -EBADF;
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if (!description->custody()) {
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// We only support bind-mounting inodes, not arbitrary files.
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return -ENODEV;
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}
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return VFS::the().bind_mount(*description->custody(), target_custody, params.flags);
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}
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RefPtr<FS> fs;
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if (fs_type == "ext2" || fs_type == "Ext2FS") {
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if (description.is_null())
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return -EBADF;
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if (!description->file().is_seekable()) {
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dbg() << "mount: this is not a seekable file";
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return -ENODEV;
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}
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dbg() << "mount: attempting to mount " << description->absolute_path() << " on " << target;
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fs = Ext2FS::create(*description);
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} else if (fs_type == "9p" || fs_type == "Plan9FS") {
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if (description.is_null())
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return -EBADF;
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fs = Plan9FS::create(*description);
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} else if (fs_type == "proc" || fs_type == "ProcFS") {
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fs = ProcFS::create();
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} else if (fs_type == "devpts" || fs_type == "DevPtsFS") {
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fs = DevPtsFS::create();
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} else if (fs_type == "tmp" || fs_type == "TmpFS") {
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fs = TmpFS::create();
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} else {
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return -ENODEV;
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}
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if (!fs->initialize()) {
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dbg() << "mount: failed to initialize " << fs_type << " filesystem, fd - " << source_fd;
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return -ENODEV;
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}
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auto result = VFS::the().mount(fs.release_nonnull(), target_custody, params.flags);
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if (!description.is_null())
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dbg() << "mount: successfully mounted " << description->absolute_path() << " on " << target;
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else
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dbg() << "mount: successfully mounted " << target;
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return result;
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}
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int Process::sys$umount(const char* user_mountpoint, size_t mountpoint_length)
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{
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if (!is_superuser())
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return -EPERM;
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REQUIRE_NO_PROMISES;
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if (!validate_read(user_mountpoint, mountpoint_length))
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return -EFAULT;
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auto mountpoint = get_syscall_path_argument(user_mountpoint, mountpoint_length);
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if (mountpoint.is_error())
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return mountpoint.error();
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auto custody_or_error = VFS::the().resolve_path(mountpoint.value(), current_directory());
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if (custody_or_error.is_error())
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return custody_or_error.error();
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auto& guest_inode = custody_or_error.value()->inode();
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return VFS::the().unmount(guest_inode);
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}
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}
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