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Kernel: Introduce threads, and refactor everything in support of it.

Browse source 
The scheduler now operates on threads, rather than on processes.
Each process has a main thread, and can have any number of additional
threads. The process exits when the main thread exits.

This patch doesn't actually spawn any additional threads, it merely
does all the plumbing needed to make it possible. :^)
This commit is contained in:
Andreas Kling 2019-03-23 22:03:17 +01:00
parent b0de6aa8d8
commit 60d25f0f4a
32 changed files with 1356 additions and 1098 deletions
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38
Kernel/VirtualFileSystem.cpp
View file

@ -138,7 +138,7 @@ KResult VFS::utime(const String& path, Inode& base, time_t atime, time_t mtime)
auto& inode = *descriptor_or_error.value()->inode();
if (inode.fs().is_readonly())
return KResult(-EROFS);
if (inode.metadata().uid != current->euid())
if (inode.metadata().uid != current->process().euid())
return KResult(-EACCES);
int error = inode.set_atime(atime);
@ -175,11 +175,11 @@ KResultOr<Retained<FileDescriptor>> VFS::open(const String& path, int options, m
// NOTE: Read permission is a bit weird, since O_RDONLY == 0,
// so we check if (NOT write_only OR read_and_write)
if (!(options & O_WRONLY) || (options & O_RDWR)) {
if (!metadata.may_read(*current))
if (!metadata.may_read(current->process()))
return KResult(-EACCES);
}
if ((options & O_WRONLY) || (options & O_RDWR)) {
if (!metadata.may_write(*current))
if (!metadata.may_write(current->process()))
return KResult(-EACCES);
if (metadata.is_directory())
return KResult(-EISDIR);
@ -188,7 +188,6 @@ KResultOr<Retained<FileDescriptor>> VFS::open(const String& path, int options, m
if (metadata.is_device()) {
auto it = m_devices.find(encoded_device(metadata.major_device, metadata.minor_device));
if (it == m_devices.end()) {
kprintf("VFS::open: no such device %u,%u\n", metadata.major_device, metadata.minor_device);
return KResult(-ENODEV);
}
auto descriptor_or_error = (*it).value->open(options);
@ -217,7 +216,7 @@ KResultOr<Retained<FileDescriptor>> VFS::create(const String& path, int options,
return KResult(-ENOENT);
if (existing_file_or_error.error() != -ENOENT)
return existing_file_or_error.error();
if (!parent_inode->metadata().may_write(*current))
if (!parent_inode->metadata().may_write(current->process()))
return KResult(-EACCES);
FileSystemPath p(path);
@ -241,7 +240,7 @@ KResult VFS::mkdir(const String& path, mode_t mode, Inode& base)
if (result.error() != -ENOENT)
return result.error();
if (!parent_inode->metadata().may_write(*current))
if (!parent_inode->metadata().may_write(current->process()))
return KResult(-EACCES);
FileSystemPath p(path);
@ -261,15 +260,15 @@ KResult VFS::access(const String& path, int mode, Inode& base)
auto inode = inode_or_error.value();
auto metadata = inode->metadata();
if (mode & R_OK) {
if (!metadata.may_read(*current))
if (!metadata.may_read(current->process()))
return KResult(-EACCES);
}
if (mode & W_OK) {
if (!metadata.may_write(*current))
if (!metadata.may_write(current->process()))
return KResult(-EACCES);
}
if (mode & X_OK) {
if (!metadata.may_execute(*current))
if (!metadata.may_execute(current->process()))
return KResult(-EACCES);
}
return KSuccess;
@ -283,7 +282,7 @@ KResultOr<Retained<Inode>> VFS::open_directory(const String& path, Inode& base)
auto inode = inode_or_error.value();
if (!inode->is_directory())
return KResult(-ENOTDIR);
if (!inode->metadata().may_execute(*current))
if (!inode->metadata().may_execute(current->process()))
return KResult(-EACCES);
return Retained<Inode>(*inode);
}
@ -293,7 +292,7 @@ KResult VFS::chmod(Inode& inode, mode_t mode)
if (inode.fs().is_readonly())
return KResult(-EROFS);
if (current->euid() != inode.metadata().uid && !current->is_superuser())
if (current->process().euid() != inode.metadata().uid && !current->process().is_superuser())
return KResult(-EPERM);
// Only change the permission bits.
@ -320,19 +319,19 @@ KResult VFS::chown(const String& path, uid_t a_uid, gid_t a_gid, Inode& base)
if (inode->fs().is_readonly())
return KResult(-EROFS);
if (current->euid() != inode->metadata().uid && !current->is_superuser())
if (current->process().euid() != inode->metadata().uid && !current->process().is_superuser())
return KResult(-EPERM);
uid_t new_uid = inode->metadata().uid;
gid_t new_gid = inode->metadata().gid;
if (a_uid != (uid_t)-1) {
if (current->euid() != a_uid && !current->is_superuser())
if (current->process().euid() != a_uid && !current->process().is_superuser())
return KResult(-EPERM);
new_uid = a_uid;
}
if (a_gid != (gid_t)-1) {
if (!current->in_group(a_gid) && !current->is_superuser())
if (!current->process().in_group(a_gid) && !current->process().is_superuser())
return KResult(-EPERM);
new_gid = a_gid;
}
@ -377,7 +376,7 @@ KResult VFS::link(const String& old_path, const String& new_path, Inode& base)
if (parent_inode->fs().is_readonly())
return KResult(-EROFS);
if (!parent_inode->metadata().may_write(*current))
if (!parent_inode->metadata().may_write(current->process()))
return KResult(-EACCES);
return parent_inode->add_child(old_inode->identifier(), FileSystemPath(new_path).basename(), 0);
@ -394,7 +393,7 @@ KResult VFS::unlink(const String& path, Inode& base)
if (inode->is_directory())
return KResult(-EISDIR);
if (!parent_inode->metadata().may_write(*current))
if (!parent_inode->metadata().may_write(current->process()))
return KResult(-EACCES);
return parent_inode->remove_child(FileSystemPath(path).basename());
@ -410,7 +409,7 @@ KResult VFS::symlink(const String& target, const String& linkpath, Inode& base)
return KResult(-ENOENT);
if (existing_file_or_error.error() != -ENOENT)
return existing_file_or_error.error();
if (!parent_inode->metadata().may_write(*current))
if (!parent_inode->metadata().may_write(current->process()))
return KResult(-EACCES);
FileSystemPath p(linkpath);
@ -442,7 +441,7 @@ KResult VFS::rmdir(const String& path, Inode& base)
if (!inode->is_directory())
return KResult(-ENOTDIR);
if (!parent_inode->metadata().may_write(*current))
if (!parent_inode->metadata().may_write(current->process()))
return KResult(-EACCES);
if (inode->directory_entry_count() != 2)
@ -561,7 +560,7 @@ KResultOr<InodeIdentifier> VFS::resolve_path(const String& path, InodeIdentifier
#endif
return KResult(-ENOTDIR);
}
if (!metadata.may_execute(*current))
if (!metadata.may_execute(current->process()))
return KResult(-EACCES);
auto parent = crumb_id;
crumb_id = crumb_inode->lookup(part);
@ -612,7 +611,6 @@ KResultOr<InodeIdentifier> VFS::resolve_path(const String& path, InodeIdentifier
ASSERT(crumb_id.is_valid());
}
}
return crumb_id;
}