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// Copyright 2019 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package vfs
import (
"gvisor.dev/gvisor/pkg/abi/linux"
)
// GetDentryOptions contains options to VirtualFilesystem.GetDentryAt() and
// FilesystemImpl.GetDentryAt().
type GetDentryOptions struct {
// If CheckSearchable is true, FilesystemImpl.GetDentryAt() must check that
// the returned Dentry is a directory for which creds has search
// permission.
CheckSearchable bool
}
// MkdirOptions contains options to VirtualFilesystem.MkdirAt() and
// FilesystemImpl.MkdirAt().
type MkdirOptions struct {
// Mode is the file mode bits for the created directory.
Mode linux.FileMode
}
// MknodOptions contains options to VirtualFilesystem.MknodAt() and
// FilesystemImpl.MknodAt().
type MknodOptions struct {
// Mode is the file type and mode bits for the created file.
Mode linux.FileMode
// If Mode specifies a character or block device special file, DevMajor and
// DevMinor are the major and minor device numbers for the created device.
DevMajor uint32
DevMinor uint32
}
// MountFlags contains flags as specified for mount(2), e.g. MS_NOEXEC.
// MS_RDONLY is not part of MountFlags because it's tracked in Mount.writers.
type MountFlags struct {
// NoExec is equivalent to MS_NOEXEC.
NoExec bool
}
// MountOptions contains options to VirtualFilesystem.MountAt().
type MountOptions struct {
// Flags contains flags as specified for mount(2), e.g. MS_NOEXEC.
Flags MountFlags
// ReadOnly is equivalent to MS_RDONLY.
ReadOnly bool
// GetFilesystemOptions contains options to FilesystemType.GetFilesystem().
GetFilesystemOptions GetFilesystemOptions
// If InternalMount is true, allow the use of filesystem types for which
// RegisterFilesystemTypeOptions.AllowUserMount == false.
InternalMount bool
}
// OpenOptions contains options to VirtualFilesystem.OpenAt() and
// FilesystemImpl.OpenAt().
type OpenOptions struct {
// Flags contains access mode and flags as specified for open(2).
//
// FilesystemImpls are responsible for implementing the following flags:
// O_RDONLY, O_WRONLY, O_RDWR, O_APPEND, O_CREAT, O_DIRECT, O_DSYNC,
// O_EXCL, O_NOATIME, O_NOCTTY, O_NONBLOCK, O_PATH, O_SYNC, O_TMPFILE, and
// O_TRUNC. VFS is responsible for handling O_DIRECTORY, O_LARGEFILE, and
// O_NOFOLLOW. VFS users are responsible for handling O_CLOEXEC, since file
// descriptors are mostly outside the scope of VFS.
Flags uint32
// If FilesystemImpl.OpenAt() creates a file, Mode is the file mode for the
// created file.
Mode linux.FileMode
// FileExec is set when the file is being opened to be executed.
// VirtualFilesystem.OpenAt() checks that the caller has execute permissions
// on the file, that the file is a regular file, and that the mount doesn't
// have MS_NOEXEC set.
FileExec bool
}
// ReadOptions contains options to FileDescription.PRead(),
// FileDescriptionImpl.PRead(), FileDescription.Read(), and
// FileDescriptionImpl.Read().
type ReadOptions struct {
// Flags contains flags as specified for preadv2(2).
Flags uint32
}
// RenameOptions contains options to VirtualFilesystem.RenameAt() and
// FilesystemImpl.RenameAt().
type RenameOptions struct {
// Flags contains flags as specified for renameat2(2).
Flags uint32
// If MustBeDir is true, the renamed file must be a directory.
MustBeDir bool
}
// SetStatOptions contains options to VirtualFilesystem.SetStatAt(),
// FilesystemImpl.SetStatAt(), FileDescription.SetStat(), and
// FileDescriptionImpl.SetStat().
type SetStatOptions struct {
// Stat is the metadata that should be set. Only fields indicated by
// Stat.Mask should be set.
//
// If Stat specifies that a timestamp should be set,
// FilesystemImpl.SetStatAt() and FileDescriptionImpl.SetStat() must
// special-case StatxTimestamp.Nsec == UTIME_NOW as described by
// utimensat(2); however, they do not need to check for StatxTimestamp.Nsec
// == UTIME_OMIT (VFS users must unset the corresponding bit in Stat.Mask
// instead).
Stat linux.Statx
}
// SetxattrOptions contains options to VirtualFilesystem.SetxattrAt(),
// FilesystemImpl.SetxattrAt(), FileDescription.Setxattr(), and
// FileDescriptionImpl.Setxattr().
type SetxattrOptions struct {
// Name is the name of the extended attribute being mutated.
Name string
// Value is the extended attribute's new value.
Value string
// Flags contains flags as specified for setxattr/lsetxattr/fsetxattr(2).
Flags uint32
}
// StatOptions contains options to VirtualFilesystem.StatAt(),
// FilesystemImpl.StatAt(), FileDescription.Stat(), and
// FileDescriptionImpl.Stat().
type StatOptions struct {
// Mask is the set of fields in the returned Statx that the FilesystemImpl
// or FileDescriptionImpl should provide. Bits are as in linux.Statx.Mask.
//
// The FilesystemImpl or FileDescriptionImpl may return fields not
// requested in Mask, and may fail to return fields requested in Mask that
// are not supported by the underlying filesystem implementation, without
// returning an error.
Mask uint32
// Sync specifies the synchronization required, and is one of
// linux.AT_STATX_SYNC_AS_STAT (which is 0, and therefore the default),
// linux.AT_STATX_SYNC_FORCE_SYNC, or linux.AT_STATX_SYNC_DONT_SYNC.
Sync uint32
}
// UmountOptions contains options to VirtualFilesystem.UmountAt().
type UmountOptions struct {
// Flags contains flags as specified for umount2(2).
Flags uint32
}
// WriteOptions contains options to FileDescription.PWrite(),
// FileDescriptionImpl.PWrite(), FileDescription.Write(), and
// FileDescriptionImpl.Write().
type WriteOptions struct {
// Flags contains flags as specified for pwritev2(2).
Flags uint32
}
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