530 lines
18 KiB
Go
530 lines
18 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package host
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import (
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"sync"
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"syscall"
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/fd"
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"gvisor.dev/gvisor/pkg/secio"
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"gvisor.dev/gvisor/pkg/sentry/context"
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"gvisor.dev/gvisor/pkg/sentry/device"
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"gvisor.dev/gvisor/pkg/sentry/fs"
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"gvisor.dev/gvisor/pkg/sentry/fs/fsutil"
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"gvisor.dev/gvisor/pkg/sentry/memmap"
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"gvisor.dev/gvisor/pkg/sentry/safemem"
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"gvisor.dev/gvisor/pkg/sentry/socket/unix/transport"
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"gvisor.dev/gvisor/pkg/syserror"
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"gvisor.dev/gvisor/pkg/waiter"
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)
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// inodeOperations implements fs.InodeOperations for an fs.Inodes backed
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// by a host file descriptor.
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//
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// +stateify savable
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type inodeOperations struct {
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fsutil.InodeNotVirtual `state:"nosave"`
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fsutil.InodeNoExtendedAttributes `state:"nosave"`
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// fileState implements fs.CachedFileObject. It exists
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// to break a circular load dependency between inodeOperations
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// and cachingInodeOps (below).
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fileState *inodeFileState `state:"wait"`
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// cachedInodeOps implements memmap.Mappable.
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cachingInodeOps *fsutil.CachingInodeOperations
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// readdirMu protects the file offset on the host FD. This is needed
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// for readdir because getdents must use the kernel offset, so
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// concurrent readdirs must be exclusive.
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//
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// All read/write functions pass the offset directly to the kernel and
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// thus don't need a lock.
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readdirMu sync.Mutex `state:"nosave"`
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}
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// inodeFileState implements fs.CachedFileObject and otherwise fully
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// encapsulates state that needs to be manually loaded on restore for
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// this file object.
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//
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// This unfortunate structure exists because fs.CachingInodeOperations
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// defines afterLoad and therefore cannot be lazily loaded (to break a
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// circular load dependency between it and inodeOperations). Even with
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// lazy loading, this approach defines the dependencies between objects
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// and the expected load behavior more concretely.
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//
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// +stateify savable
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type inodeFileState struct {
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// Common file system state.
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mops *superOperations `state:"wait"`
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// descriptor is the backing host FD.
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descriptor *descriptor `state:"wait"`
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// Event queue for blocking operations.
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queue waiter.Queue `state:"zerovalue"`
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// sattr is used to restore the inodeOperations.
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sattr fs.StableAttr `state:"wait"`
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// savedUAttr is only allocated during S/R. It points to the save-time
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// unstable attributes and is used to validate restore-time ones.
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//
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// Note that these unstable attributes are only used to detect cross-S/R
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// external file system metadata changes. They may differ from the
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// cached unstable attributes in cachingInodeOps, as that might differ
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// from the external file system attributes if there had been WriteOut
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// failures. S/R is transparent to Sentry and the latter will continue
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// using its cached values after restore.
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savedUAttr *fs.UnstableAttr
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}
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// ReadToBlocksAt implements fsutil.CachedFileObject.ReadToBlocksAt.
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func (i *inodeFileState) ReadToBlocksAt(ctx context.Context, dsts safemem.BlockSeq, offset uint64) (uint64, error) {
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// TODO(jamieliu): Using safemem.FromIOReader here is wasteful for two
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// reasons:
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//
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// - Using preadv instead of iterated preads saves on host system calls.
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//
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// - Host system calls can handle destination memory that would fault in
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// gr3 (i.e. they can accept safemem.Blocks with NeedSafecopy() == true),
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// so the buffering performed by FromIOReader is unnecessary.
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//
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// This also applies to the write path below.
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return safemem.FromIOReader{secio.NewOffsetReader(fd.NewReadWriter(i.FD()), int64(offset))}.ReadToBlocks(dsts)
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}
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// WriteFromBlocksAt implements fsutil.CachedFileObject.WriteFromBlocksAt.
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func (i *inodeFileState) WriteFromBlocksAt(ctx context.Context, srcs safemem.BlockSeq, offset uint64) (uint64, error) {
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return safemem.FromIOWriter{secio.NewOffsetWriter(fd.NewReadWriter(i.FD()), int64(offset))}.WriteFromBlocks(srcs)
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}
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// SetMaskedAttributes implements fsutil.CachedFileObject.SetMaskedAttributes.
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func (i *inodeFileState) SetMaskedAttributes(ctx context.Context, mask fs.AttrMask, attr fs.UnstableAttr, _ bool) error {
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if mask.Empty() {
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return nil
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}
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if mask.UID || mask.GID {
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return syserror.EPERM
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}
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if mask.Perms {
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if err := syscall.Fchmod(i.FD(), uint32(attr.Perms.LinuxMode())); err != nil {
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return err
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}
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}
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if mask.Size {
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if err := syscall.Ftruncate(i.FD(), attr.Size); err != nil {
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return err
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}
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}
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if mask.AccessTime || mask.ModificationTime {
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ts := fs.TimeSpec{
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ATime: attr.AccessTime,
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ATimeOmit: !mask.AccessTime,
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MTime: attr.ModificationTime,
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MTimeOmit: !mask.ModificationTime,
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}
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if err := setTimestamps(i.FD(), ts); err != nil {
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return err
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}
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}
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return nil
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}
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// Sync implements fsutil.CachedFileObject.Sync.
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func (i *inodeFileState) Sync(ctx context.Context) error {
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return syscall.Fsync(i.FD())
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}
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// FD implements fsutil.CachedFileObject.FD.
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func (i *inodeFileState) FD() int {
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return i.descriptor.value
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}
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func (i *inodeFileState) unstableAttr(ctx context.Context) (fs.UnstableAttr, error) {
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var s syscall.Stat_t
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if err := syscall.Fstat(i.FD(), &s); err != nil {
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return fs.UnstableAttr{}, err
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}
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return unstableAttr(i.mops, &s), nil
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}
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// Allocate implements fsutil.CachedFileObject.Allocate.
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func (i *inodeFileState) Allocate(_ context.Context, offset, length int64) error {
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return syscall.Fallocate(i.FD(), 0, offset, length)
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}
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// inodeOperations implements fs.InodeOperations.
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var _ fs.InodeOperations = (*inodeOperations)(nil)
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// newInode returns a new fs.Inode backed by the host FD.
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func newInode(ctx context.Context, msrc *fs.MountSource, fd int, saveable bool, donated bool) (*fs.Inode, error) {
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// Retrieve metadata.
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var s syscall.Stat_t
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err := syscall.Fstat(fd, &s)
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if err != nil {
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return nil, err
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}
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fileState := &inodeFileState{
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mops: msrc.MountSourceOperations.(*superOperations),
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sattr: stableAttr(&s),
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}
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// Initialize the wrapped host file descriptor.
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fileState.descriptor, err = newDescriptor(
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fd,
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donated,
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saveable,
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wouldBlock(&s),
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&fileState.queue,
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)
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if err != nil {
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return nil, err
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}
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// Build the fs.InodeOperations.
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uattr := unstableAttr(msrc.MountSourceOperations.(*superOperations), &s)
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iops := &inodeOperations{
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fileState: fileState,
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cachingInodeOps: fsutil.NewCachingInodeOperations(ctx, fileState, uattr, fsutil.CachingInodeOperationsOptions{
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ForcePageCache: msrc.Flags.ForcePageCache,
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}),
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}
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// Return the fs.Inode.
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return fs.NewInode(ctx, iops, msrc, fileState.sattr), nil
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}
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// Mappable implements fs.InodeOperations.Mappable.
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func (i *inodeOperations) Mappable(inode *fs.Inode) memmap.Mappable {
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if !canMap(inode) {
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return nil
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}
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return i.cachingInodeOps
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}
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// ReturnsWouldBlock returns true if this host FD can return EWOULDBLOCK for
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// operations that would block.
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func (i *inodeOperations) ReturnsWouldBlock() bool {
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return i.fileState.descriptor.wouldBlock
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}
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// Release implements fs.InodeOperations.Release.
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func (i *inodeOperations) Release(context.Context) {
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i.fileState.descriptor.Release()
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i.cachingInodeOps.Release()
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}
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// Lookup implements fs.InodeOperations.Lookup.
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func (i *inodeOperations) Lookup(ctx context.Context, dir *fs.Inode, name string) (*fs.Dirent, error) {
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// Get a new FD relative to i at name.
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fd, err := open(i, name)
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if err != nil {
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if err == syserror.ENOENT {
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return nil, syserror.ENOENT
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}
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return nil, err
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}
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inode, err := newInode(ctx, dir.MountSource, fd, false /* saveable */, false /* donated */)
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if err != nil {
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return nil, err
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}
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// Return the fs.Dirent.
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return fs.NewDirent(ctx, inode, name), nil
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}
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// Create implements fs.InodeOperations.Create.
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func (i *inodeOperations) Create(ctx context.Context, dir *fs.Inode, name string, flags fs.FileFlags, perm fs.FilePermissions) (*fs.File, error) {
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// Create a file relative to i at name.
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//
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// N.B. We always open this file O_RDWR regardless of flags because a
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// future GetFile might want more access. Open allows this regardless
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// of perm.
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fd, err := openAt(i, name, syscall.O_RDWR|syscall.O_CREAT|syscall.O_EXCL, perm.LinuxMode())
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if err != nil {
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return nil, err
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}
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inode, err := newInode(ctx, dir.MountSource, fd, false /* saveable */, false /* donated */)
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if err != nil {
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return nil, err
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}
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d := fs.NewDirent(ctx, inode, name)
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defer d.DecRef()
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return inode.GetFile(ctx, d, flags)
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}
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// CreateDirectory implements fs.InodeOperations.CreateDirectory.
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func (i *inodeOperations) CreateDirectory(ctx context.Context, dir *fs.Inode, name string, perm fs.FilePermissions) error {
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return syscall.Mkdirat(i.fileState.FD(), name, uint32(perm.LinuxMode()))
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}
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// CreateLink implements fs.InodeOperations.CreateLink.
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func (i *inodeOperations) CreateLink(ctx context.Context, dir *fs.Inode, oldname string, newname string) error {
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return createLink(i.fileState.FD(), oldname, newname)
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}
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// CreateHardLink implements fs.InodeOperations.CreateHardLink.
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func (*inodeOperations) CreateHardLink(context.Context, *fs.Inode, *fs.Inode, string) error {
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return syserror.EPERM
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}
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// CreateFifo implements fs.InodeOperations.CreateFifo.
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func (*inodeOperations) CreateFifo(context.Context, *fs.Inode, string, fs.FilePermissions) error {
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return syserror.EPERM
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}
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// Remove implements fs.InodeOperations.Remove.
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func (i *inodeOperations) Remove(ctx context.Context, dir *fs.Inode, name string) error {
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return unlinkAt(i.fileState.FD(), name, false /* dir */)
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}
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// RemoveDirectory implements fs.InodeOperations.RemoveDirectory.
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func (i *inodeOperations) RemoveDirectory(ctx context.Context, dir *fs.Inode, name string) error {
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return unlinkAt(i.fileState.FD(), name, true /* dir */)
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}
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// Rename implements fs.InodeOperations.Rename.
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func (i *inodeOperations) Rename(ctx context.Context, inode *fs.Inode, oldParent *fs.Inode, oldName string, newParent *fs.Inode, newName string, replacement bool) error {
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op, ok := oldParent.InodeOperations.(*inodeOperations)
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if !ok {
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return syscall.EXDEV
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}
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np, ok := newParent.InodeOperations.(*inodeOperations)
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if !ok {
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return syscall.EXDEV
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}
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return syscall.Renameat(op.fileState.FD(), oldName, np.fileState.FD(), newName)
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}
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// Bind implements fs.InodeOperations.Bind.
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func (i *inodeOperations) Bind(ctx context.Context, dir *fs.Inode, name string, data transport.BoundEndpoint, perm fs.FilePermissions) (*fs.Dirent, error) {
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return nil, syserror.EOPNOTSUPP
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}
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// BoundEndpoint implements fs.InodeOperations.BoundEndpoint.
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func (i *inodeOperations) BoundEndpoint(inode *fs.Inode, path string) transport.BoundEndpoint {
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return nil
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}
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// GetFile implements fs.InodeOperations.GetFile.
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func (i *inodeOperations) GetFile(ctx context.Context, d *fs.Dirent, flags fs.FileFlags) (*fs.File, error) {
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return newFile(ctx, d, flags, i), nil
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}
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// canMap returns true if this fs.Inode can be memory mapped.
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func canMap(inode *fs.Inode) bool {
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// FIXME(b/38213152): Some obscure character devices can be mapped.
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return fs.IsFile(inode.StableAttr)
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}
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// UnstableAttr implements fs.InodeOperations.UnstableAttr.
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func (i *inodeOperations) UnstableAttr(ctx context.Context, inode *fs.Inode) (fs.UnstableAttr, error) {
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// When the kernel supports mapping host FDs, we do so to take
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// advantage of the host page cache. We forego updating fs.Inodes
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// because the host manages consistency of its own inode structures.
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//
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// For fs.Inodes that can never be mapped we take advantage of
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// synchronizing metadata updates through host caches.
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//
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// So can we use host kernel metadata caches?
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if !inode.MountSource.Flags.ForcePageCache || !canMap(inode) {
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// Then just obtain the attributes.
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return i.fileState.unstableAttr(ctx)
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}
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// No, we're maintaining consistency of metadata ourselves.
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return i.cachingInodeOps.UnstableAttr(ctx, inode)
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}
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// Check implements fs.InodeOperations.Check.
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func (i *inodeOperations) Check(ctx context.Context, inode *fs.Inode, p fs.PermMask) bool {
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return fs.ContextCanAccessFile(ctx, inode, p)
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}
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// SetOwner implements fs.InodeOperations.SetOwner.
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func (i *inodeOperations) SetOwner(context.Context, *fs.Inode, fs.FileOwner) error {
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return syserror.EPERM
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}
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// SetPermissions implements fs.InodeOperations.SetPermissions.
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func (i *inodeOperations) SetPermissions(ctx context.Context, inode *fs.Inode, f fs.FilePermissions) bool {
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// Can we use host kernel metadata caches?
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if !inode.MountSource.Flags.ForcePageCache || !canMap(inode) {
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// Then just change the timestamps on the FD, the host
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// will synchronize the metadata update with any host
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// inode and page cache.
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return syscall.Fchmod(i.fileState.FD(), uint32(f.LinuxMode())) == nil
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}
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// Otherwise update our cached metadata.
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return i.cachingInodeOps.SetPermissions(ctx, inode, f)
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}
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// SetTimestamps implements fs.InodeOperations.SetTimestamps.
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func (i *inodeOperations) SetTimestamps(ctx context.Context, inode *fs.Inode, ts fs.TimeSpec) error {
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// Can we use host kernel metadata caches?
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if !inode.MountSource.Flags.ForcePageCache || !canMap(inode) {
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// Then just change the timestamps on the FD, the host
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// will synchronize the metadata update with any host
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// inode and page cache.
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return setTimestamps(i.fileState.FD(), ts)
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}
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// Otherwise update our cached metadata.
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return i.cachingInodeOps.SetTimestamps(ctx, inode, ts)
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}
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// Truncate implements fs.InodeOperations.Truncate.
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func (i *inodeOperations) Truncate(ctx context.Context, inode *fs.Inode, size int64) error {
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// Is the file not memory-mappable?
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if !canMap(inode) {
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// Then just change the file size on the FD, the host
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// will synchronize the metadata update with any host
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// inode and page cache.
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return syscall.Ftruncate(i.fileState.FD(), size)
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}
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// Otherwise we need to go through cachingInodeOps, even if the host page
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// cache is in use, to invalidate private copies of truncated pages.
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return i.cachingInodeOps.Truncate(ctx, inode, size)
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}
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// Allocate implements fs.InodeOperations.Allocate.
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func (i *inodeOperations) Allocate(ctx context.Context, inode *fs.Inode, offset, length int64) error {
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// Is the file not memory-mappable?
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if !canMap(inode) {
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// Then just send the call to the FD, the host will synchronize the metadata
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// update with any host inode and page cache.
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return i.fileState.Allocate(ctx, offset, length)
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}
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// Otherwise we need to go through cachingInodeOps, even if the host page
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// cache is in use, to invalidate private copies of truncated pages.
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return i.cachingInodeOps.Allocate(ctx, offset, length)
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}
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// WriteOut implements fs.InodeOperations.WriteOut.
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func (i *inodeOperations) WriteOut(ctx context.Context, inode *fs.Inode) error {
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// Have we been using host kernel metadata caches?
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if !inode.MountSource.Flags.ForcePageCache || !canMap(inode) {
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// Then the metadata is already up to date on the host.
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return nil
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}
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// Otherwise we need to write out cached pages and attributes
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// that are dirty.
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return i.cachingInodeOps.WriteOut(ctx, inode)
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}
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// Readlink implements fs.InodeOperations.Readlink.
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func (i *inodeOperations) Readlink(ctx context.Context, inode *fs.Inode) (string, error) {
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return readLink(i.fileState.FD())
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}
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// Getlink implements fs.InodeOperations.Getlink.
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func (i *inodeOperations) Getlink(context.Context, *fs.Inode) (*fs.Dirent, error) {
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if !fs.IsSymlink(i.fileState.sattr) {
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return nil, syserror.ENOLINK
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}
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return nil, fs.ErrResolveViaReadlink
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}
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// StatFS implements fs.InodeOperations.StatFS.
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func (i *inodeOperations) StatFS(context.Context) (fs.Info, error) {
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return fs.Info{}, syserror.ENOSYS
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}
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// AddLink implements fs.InodeOperations.AddLink.
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// FIXME(b/63117438): Remove this from InodeOperations altogether.
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func (i *inodeOperations) AddLink() {}
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// DropLink implements fs.InodeOperations.DropLink.
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// FIXME(b/63117438): Remove this from InodeOperations altogether.
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func (i *inodeOperations) DropLink() {}
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// NotifyStatusChange implements fs.InodeOperations.NotifyStatusChange.
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// FIXME(b/63117438): Remove this from InodeOperations altogether.
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func (i *inodeOperations) NotifyStatusChange(ctx context.Context) {}
|
|
|
|
// readdirAll returns all of the directory entries in i.
|
|
func (i *inodeOperations) readdirAll(d *dirInfo) (map[string]fs.DentAttr, error) {
|
|
i.readdirMu.Lock()
|
|
defer i.readdirMu.Unlock()
|
|
|
|
fd := i.fileState.FD()
|
|
|
|
// syscall.ReadDirent will use getdents, which will seek the file past
|
|
// the last directory entry. To read the directory entries a second
|
|
// time, we need to seek back to the beginning.
|
|
if _, err := syscall.Seek(fd, 0, 0); err != nil {
|
|
if err == syscall.ESPIPE {
|
|
// All directories should be seekable. If this file
|
|
// isn't seekable, it is not a directory and we should
|
|
// return that more sane error.
|
|
err = syscall.ENOTDIR
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
names := make([]string, 0, 100)
|
|
for {
|
|
// Refill the buffer if necessary
|
|
if d.bufp >= d.nbuf {
|
|
d.bufp = 0
|
|
// ReadDirent will just do a sys_getdents64 to the kernel.
|
|
n, err := syscall.ReadDirent(fd, d.buf)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if n == 0 {
|
|
break // EOF
|
|
}
|
|
d.nbuf = n
|
|
}
|
|
|
|
var nb int
|
|
// Parse the dirent buffer we just get and return the directory names along
|
|
// with the number of bytes consumed in the buffer.
|
|
nb, _, names = syscall.ParseDirent(d.buf[d.bufp:d.nbuf], -1, names)
|
|
d.bufp += nb
|
|
}
|
|
|
|
entries := make(map[string]fs.DentAttr)
|
|
for _, filename := range names {
|
|
// Lookup the type and host device and inode.
|
|
stat, lerr := fstatat(fd, filename, linux.AT_SYMLINK_NOFOLLOW)
|
|
if lerr == syscall.ENOENT {
|
|
// File disappeared between readdir and lstat.
|
|
// Just treat it as if it didn't exist.
|
|
continue
|
|
}
|
|
|
|
// There was a serious problem, we should probably report it.
|
|
if lerr != nil {
|
|
return nil, lerr
|
|
}
|
|
|
|
entries[filename] = fs.DentAttr{
|
|
Type: nodeType(&stat),
|
|
InodeID: hostFileDevice.Map(device.MultiDeviceKey{
|
|
Device: stat.Dev,
|
|
Inode: stat.Ino,
|
|
}),
|
|
}
|
|
}
|
|
return entries, nil
|
|
}
|