220 lines
7.2 KiB
Go
220 lines
7.2 KiB
Go
// Copyright 2019 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 gofer
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import (
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"gvisor.dev/gvisor/pkg/context"
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"gvisor.dev/gvisor/pkg/fd"
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"gvisor.dev/gvisor/pkg/p9"
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"gvisor.dev/gvisor/pkg/syserror"
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)
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// p9file is a wrapper around p9.File that provides methods that are
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// Context-aware.
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type p9file struct {
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file p9.File
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}
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func (f p9file) isNil() bool {
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return f.file == nil
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}
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func (f p9file) walk(ctx context.Context, names []string) ([]p9.QID, p9file, error) {
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ctx.UninterruptibleSleepStart(false)
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qids, newfile, err := f.file.Walk(names)
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ctx.UninterruptibleSleepFinish(false)
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return qids, p9file{newfile}, err
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}
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func (f p9file) walkGetAttr(ctx context.Context, names []string) ([]p9.QID, p9file, p9.AttrMask, p9.Attr, error) {
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ctx.UninterruptibleSleepStart(false)
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qids, newfile, attrMask, attr, err := f.file.WalkGetAttr(names)
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ctx.UninterruptibleSleepFinish(false)
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return qids, p9file{newfile}, attrMask, attr, err
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}
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// walkGetAttrOne is a wrapper around p9.File.WalkGetAttr that takes a single
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// path component and returns a single qid.
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func (f p9file) walkGetAttrOne(ctx context.Context, name string) (p9.QID, p9file, p9.AttrMask, p9.Attr, error) {
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ctx.UninterruptibleSleepStart(false)
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qids, newfile, attrMask, attr, err := f.file.WalkGetAttr([]string{name})
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ctx.UninterruptibleSleepFinish(false)
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if err != nil {
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return p9.QID{}, p9file{}, p9.AttrMask{}, p9.Attr{}, err
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}
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if len(qids) != 1 {
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ctx.Warningf("p9.File.WalkGetAttr returned %d qids (%v), wanted 1", len(qids), qids)
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if newfile != nil {
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p9file{newfile}.close(ctx)
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}
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return p9.QID{}, p9file{}, p9.AttrMask{}, p9.Attr{}, syserror.EIO
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}
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return qids[0], p9file{newfile}, attrMask, attr, nil
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}
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func (f p9file) statFS(ctx context.Context) (p9.FSStat, error) {
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ctx.UninterruptibleSleepStart(false)
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fsstat, err := f.file.StatFS()
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ctx.UninterruptibleSleepFinish(false)
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return fsstat, err
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}
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func (f p9file) getAttr(ctx context.Context, req p9.AttrMask) (p9.QID, p9.AttrMask, p9.Attr, error) {
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ctx.UninterruptibleSleepStart(false)
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qid, attrMask, attr, err := f.file.GetAttr(req)
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ctx.UninterruptibleSleepFinish(false)
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return qid, attrMask, attr, err
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}
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func (f p9file) setAttr(ctx context.Context, valid p9.SetAttrMask, attr p9.SetAttr) error {
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ctx.UninterruptibleSleepStart(false)
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err := f.file.SetAttr(valid, attr)
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ctx.UninterruptibleSleepFinish(false)
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return err
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}
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func (f p9file) getXattr(ctx context.Context, name string, size uint64) (string, error) {
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ctx.UninterruptibleSleepStart(false)
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val, err := f.file.GetXattr(name, size)
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ctx.UninterruptibleSleepFinish(false)
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return val, err
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}
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func (f p9file) setXattr(ctx context.Context, name, value string, flags uint32) error {
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ctx.UninterruptibleSleepStart(false)
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err := f.file.SetXattr(name, value, flags)
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ctx.UninterruptibleSleepFinish(false)
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return err
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}
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func (f p9file) allocate(ctx context.Context, mode p9.AllocateMode, offset, length uint64) error {
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ctx.UninterruptibleSleepStart(false)
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err := f.file.Allocate(mode, offset, length)
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ctx.UninterruptibleSleepFinish(false)
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return err
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}
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func (f p9file) close(ctx context.Context) error {
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ctx.UninterruptibleSleepStart(false)
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err := f.file.Close()
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ctx.UninterruptibleSleepFinish(false)
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return err
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}
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func (f p9file) open(ctx context.Context, flags p9.OpenFlags) (*fd.FD, p9.QID, uint32, error) {
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ctx.UninterruptibleSleepStart(false)
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fdobj, qid, iounit, err := f.file.Open(flags)
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ctx.UninterruptibleSleepFinish(false)
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return fdobj, qid, iounit, err
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}
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func (f p9file) readAt(ctx context.Context, p []byte, offset uint64) (int, error) {
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ctx.UninterruptibleSleepStart(false)
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n, err := f.file.ReadAt(p, offset)
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ctx.UninterruptibleSleepFinish(false)
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return n, err
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}
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func (f p9file) writeAt(ctx context.Context, p []byte, offset uint64) (int, error) {
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ctx.UninterruptibleSleepStart(false)
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n, err := f.file.WriteAt(p, offset)
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ctx.UninterruptibleSleepFinish(false)
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return n, err
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}
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func (f p9file) fsync(ctx context.Context) error {
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ctx.UninterruptibleSleepStart(false)
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err := f.file.FSync()
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ctx.UninterruptibleSleepFinish(false)
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return err
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}
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func (f p9file) create(ctx context.Context, name string, flags p9.OpenFlags, permissions p9.FileMode, uid p9.UID, gid p9.GID) (*fd.FD, p9file, p9.QID, uint32, error) {
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ctx.UninterruptibleSleepStart(false)
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fdobj, newfile, qid, iounit, err := f.file.Create(name, flags, permissions, uid, gid)
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ctx.UninterruptibleSleepFinish(false)
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return fdobj, p9file{newfile}, qid, iounit, err
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}
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func (f p9file) mkdir(ctx context.Context, name string, permissions p9.FileMode, uid p9.UID, gid p9.GID) (p9.QID, error) {
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ctx.UninterruptibleSleepStart(false)
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qid, err := f.file.Mkdir(name, permissions, uid, gid)
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ctx.UninterruptibleSleepFinish(false)
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return qid, err
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}
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func (f p9file) symlink(ctx context.Context, oldName string, newName string, uid p9.UID, gid p9.GID) (p9.QID, error) {
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ctx.UninterruptibleSleepStart(false)
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qid, err := f.file.Symlink(oldName, newName, uid, gid)
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ctx.UninterruptibleSleepFinish(false)
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return qid, err
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}
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func (f p9file) link(ctx context.Context, target p9file, newName string) error {
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ctx.UninterruptibleSleepStart(false)
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err := f.file.Link(target.file, newName)
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ctx.UninterruptibleSleepFinish(false)
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return err
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}
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func (f p9file) mknod(ctx context.Context, name string, mode p9.FileMode, major uint32, minor uint32, uid p9.UID, gid p9.GID) (p9.QID, error) {
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ctx.UninterruptibleSleepStart(false)
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qid, err := f.file.Mknod(name, mode, major, minor, uid, gid)
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ctx.UninterruptibleSleepFinish(false)
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return qid, err
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}
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func (f p9file) rename(ctx context.Context, newDir p9file, newName string) error {
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ctx.UninterruptibleSleepStart(false)
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err := f.file.Rename(newDir.file, newName)
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ctx.UninterruptibleSleepFinish(false)
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return err
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}
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func (f p9file) unlinkAt(ctx context.Context, name string, flags uint32) error {
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ctx.UninterruptibleSleepStart(false)
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err := f.file.UnlinkAt(name, flags)
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ctx.UninterruptibleSleepFinish(false)
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return err
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}
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func (f p9file) readdir(ctx context.Context, offset uint64, count uint32) ([]p9.Dirent, error) {
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ctx.UninterruptibleSleepStart(false)
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dirents, err := f.file.Readdir(offset, count)
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ctx.UninterruptibleSleepFinish(false)
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return dirents, err
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}
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func (f p9file) readlink(ctx context.Context) (string, error) {
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ctx.UninterruptibleSleepStart(false)
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target, err := f.file.Readlink()
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ctx.UninterruptibleSleepFinish(false)
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return target, err
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}
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func (f p9file) flush(ctx context.Context) error {
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ctx.UninterruptibleSleepStart(false)
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err := f.file.Flush()
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ctx.UninterruptibleSleepFinish(false)
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return err
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}
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func (f p9file) connect(ctx context.Context, flags p9.ConnectFlags) (*fd.FD, error) {
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ctx.UninterruptibleSleepStart(false)
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fdobj, err := f.file.Connect(flags)
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ctx.UninterruptibleSleepFinish(false)
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return fdobj, err
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}
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