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-rw-r--r--runsc/fsgofer/fsgofer.go150
1 files changed, 66 insertions, 84 deletions
diff --git a/runsc/fsgofer/fsgofer.go b/runsc/fsgofer/fsgofer.go
index 82a46910e..723e118e1 100644
--- a/runsc/fsgofer/fsgofer.go
+++ b/runsc/fsgofer/fsgofer.go
@@ -48,36 +48,6 @@ const (
openFlags = syscall.O_NOFOLLOW | syscall.O_CLOEXEC
)
-type fileType int
-
-const (
- regular fileType = iota
- directory
- symlink
- socket
- unknown
-)
-
-// String implements fmt.Stringer.
-func (f fileType) String() string {
- switch f {
- case regular:
- return "regular"
- case directory:
- return "directory"
- case symlink:
- return "symlink"
- case socket:
- return "socket"
- }
- return "unknown"
-}
-
-// ControlSocketAddr generates an abstract unix socket name for the given id.
-func ControlSocketAddr(id string) string {
- return fmt.Sprintf("\x00runsc-gofer.%s", id)
-}
-
// Config sets configuration options for each attach point.
type Config struct {
// ROMount is set to true if this is a readonly mount.
@@ -199,8 +169,6 @@ func (a *attachPoint) makeQID(stat syscall.Stat_t) p9.QID {
// entire file up when it's opened in write mode, and would perform badly when
// multiple files are only being opened for read (esp. startup).
type localFile struct {
- p9.DefaultWalkGetAttr
-
// attachPoint is the attachPoint that serves this localFile.
attachPoint *attachPoint
@@ -220,8 +188,11 @@ type localFile struct {
// if localFile isn't opened.
mode p9.OpenFlags
- // ft is the fileType for this file.
- ft fileType
+ // fileType for this file. It is equivalent to:
+ // syscall.Stat_t.Mode & syscall.S_IFMT
+ fileType uint32
+
+ qid p9.QID
// readDirMu protects against concurrent Readdir calls.
readDirMu sync.Mutex
@@ -308,29 +279,24 @@ func openAnyFile(path string, fn func(mode int) (*fd.FD, error)) (*fd.FD, bool,
return nil, false, extractErrno(err)
}
-func getSupportedFileType(stat syscall.Stat_t, permitSocket bool) (fileType, error) {
- var ft fileType
+func checkSupportedFileType(stat syscall.Stat_t, permitSocket bool) error {
switch stat.Mode & syscall.S_IFMT {
- case syscall.S_IFREG:
- ft = regular
- case syscall.S_IFDIR:
- ft = directory
- case syscall.S_IFLNK:
- ft = symlink
+ case syscall.S_IFREG, syscall.S_IFDIR, syscall.S_IFLNK:
+ return nil
+
case syscall.S_IFSOCK:
if !permitSocket {
- return unknown, syscall.EPERM
+ return syscall.EPERM
}
- ft = socket
+ return nil
+
default:
- return unknown, syscall.EPERM
+ return syscall.EPERM
}
- return ft, nil
}
func newLocalFile(a *attachPoint, file *fd.FD, path string, readable bool, stat syscall.Stat_t) (*localFile, error) {
- ft, err := getSupportedFileType(stat, a.conf.HostUDS)
- if err != nil {
+ if err := checkSupportedFileType(stat, a.conf.HostUDS); err != nil {
return nil, err
}
@@ -339,7 +305,8 @@ func newLocalFile(a *attachPoint, file *fd.FD, path string, readable bool, stat
hostPath: path,
file: file,
mode: invalidMode,
- ft: ft,
+ fileType: stat.Mode & syscall.S_IFMT,
+ qid: a.makeQID(stat),
controlReadable: readable,
}, nil
}
@@ -359,7 +326,7 @@ func newFDMaybe(file *fd.FD) *fd.FD {
// fd is blocking; non-blocking is required.
if err := syscall.SetNonblock(dup.FD(), true); err != nil {
- dup.Close()
+ _ = dup.Close()
return nil
}
return dup
@@ -409,16 +376,8 @@ func (l *localFile) Open(flags p9.OpenFlags) (*fd.FD, p9.QID, uint32, error) {
}
}
- stat, err := fstat(newFile.FD())
- if err != nil {
- if newFile != l.file {
- newFile.Close()
- }
- return nil, p9.QID{}, 0, extractErrno(err)
- }
-
var fd *fd.FD
- if stat.Mode&syscall.S_IFMT == syscall.S_IFREG {
+ if l.fileType == syscall.S_IFREG {
// Donate FD for regular files only.
fd = newFDMaybe(newFile)
}
@@ -431,7 +390,7 @@ func (l *localFile) Open(flags p9.OpenFlags) (*fd.FD, p9.QID, uint32, error) {
l.file = newFile
}
l.mode = flags & p9.OpenFlagsModeMask
- return fd, l.attachPoint.makeQID(stat), 0, nil
+ return fd, l.qid, 0, nil
}
// Create implements p9.File.
@@ -459,7 +418,7 @@ func (l *localFile) Create(name string, mode p9.OpenFlags, perm p9.FileMode, uid
return nil, nil, p9.QID{}, 0, extractErrno(err)
}
cu := cleanup.Make(func() {
- child.Close()
+ _ = child.Close()
// Best effort attempt to remove the file in case of failure.
if err := syscall.Unlinkat(l.file.FD(), name); err != nil {
log.Warningf("error unlinking file %q after failure: %v", path.Join(l.hostPath, name), err)
@@ -480,10 +439,12 @@ func (l *localFile) Create(name string, mode p9.OpenFlags, perm p9.FileMode, uid
hostPath: path.Join(l.hostPath, name),
file: child,
mode: mode,
+ fileType: syscall.S_IFREG,
+ qid: l.attachPoint.makeQID(stat),
}
cu.Release()
- return newFDMaybe(c.file), c, l.attachPoint.makeQID(stat), 0, nil
+ return newFDMaybe(c.file), c, c.qid, 0, nil
}
// Mkdir implements p9.File.
@@ -529,19 +490,34 @@ func (l *localFile) Mkdir(name string, perm p9.FileMode, uid p9.UID, gid p9.GID)
// Walk implements p9.File.
func (l *localFile) Walk(names []string) ([]p9.QID, p9.File, error) {
+ qids, file, _, err := l.walk(names)
+ return qids, file, err
+}
+
+// WalkGetAttr implements p9.File.
+func (l *localFile) WalkGetAttr(names []string) ([]p9.QID, p9.File, p9.AttrMask, p9.Attr, error) {
+ qids, file, stat, err := l.walk(names)
+ if err != nil {
+ return nil, nil, p9.AttrMask{}, p9.Attr{}, err
+ }
+ mask, attr := l.fillAttr(stat)
+ return qids, file, mask, attr, nil
+}
+
+func (l *localFile) walk(names []string) ([]p9.QID, p9.File, syscall.Stat_t, error) {
// Duplicate current file if 'names' is empty.
if len(names) == 0 {
newFile, readable, err := openAnyFile(l.hostPath, func(mode int) (*fd.FD, error) {
return reopenProcFd(l.file, openFlags|mode)
})
if err != nil {
- return nil, nil, extractErrno(err)
+ return nil, nil, syscall.Stat_t{}, extractErrno(err)
}
stat, err := fstat(newFile.FD())
if err != nil {
- newFile.Close()
- return nil, nil, extractErrno(err)
+ _ = newFile.Close()
+ return nil, nil, syscall.Stat_t{}, extractErrno(err)
}
c := &localFile{
@@ -549,36 +525,39 @@ func (l *localFile) Walk(names []string) ([]p9.QID, p9.File, error) {
hostPath: l.hostPath,
file: newFile,
mode: invalidMode,
+ fileType: l.fileType,
+ qid: l.attachPoint.makeQID(stat),
controlReadable: readable,
}
- return []p9.QID{l.attachPoint.makeQID(stat)}, c, nil
+ return []p9.QID{c.qid}, c, stat, nil
}
var qids []p9.QID
+ var lastStat syscall.Stat_t
last := l
for _, name := range names {
f, path, readable, err := openAnyFileFromParent(last, name)
if last != l {
- last.Close()
+ _ = last.Close()
}
if err != nil {
- return nil, nil, extractErrno(err)
+ return nil, nil, syscall.Stat_t{}, extractErrno(err)
}
- stat, err := fstat(f.FD())
+ lastStat, err = fstat(f.FD())
if err != nil {
- f.Close()
- return nil, nil, extractErrno(err)
+ _ = f.Close()
+ return nil, nil, syscall.Stat_t{}, extractErrno(err)
}
- c, err := newLocalFile(last.attachPoint, f, path, readable, stat)
+ c, err := newLocalFile(last.attachPoint, f, path, readable, lastStat)
if err != nil {
- f.Close()
- return nil, nil, extractErrno(err)
+ _ = f.Close()
+ return nil, nil, syscall.Stat_t{}, extractErrno(err)
}
- qids = append(qids, l.attachPoint.makeQID(stat))
+ qids = append(qids, c.qid)
last = c
}
- return qids, last, nil
+ return qids, last, lastStat, nil
}
// StatFS implements p9.File.
@@ -618,12 +597,16 @@ func (l *localFile) GetAttr(_ p9.AttrMask) (p9.QID, p9.AttrMask, p9.Attr, error)
if err != nil {
return p9.QID{}, p9.AttrMask{}, p9.Attr{}, extractErrno(err)
}
+ mask, attr := l.fillAttr(stat)
+ return l.qid, mask, attr, nil
+}
+func (l *localFile) fillAttr(stat syscall.Stat_t) (p9.AttrMask, p9.Attr) {
attr := p9.Attr{
Mode: p9.FileMode(stat.Mode),
UID: p9.UID(stat.Uid),
GID: p9.GID(stat.Gid),
- NLink: uint64(stat.Nlink),
+ NLink: stat.Nlink,
RDev: stat.Rdev,
Size: uint64(stat.Size),
BlockSize: uint64(stat.Blksize),
@@ -647,8 +630,7 @@ func (l *localFile) GetAttr(_ p9.AttrMask) (p9.QID, p9.AttrMask, p9.Attr, error)
MTime: true,
CTime: true,
}
-
- return l.attachPoint.makeQID(stat), valid, attr, nil
+ return valid, attr
}
// SetAttr implements p9.File. Due to mismatch in file API, options
@@ -689,7 +671,7 @@ func (l *localFile) SetAttr(valid p9.SetAttrMask, attr p9.SetAttr) error {
// Check if it's possible to use cached file, or if another one needs to be
// opened for write.
f := l.file
- if l.ft == regular && l.mode != p9.WriteOnly && l.mode != p9.ReadWrite {
+ if l.fileType == syscall.S_IFREG && l.mode != p9.WriteOnly && l.mode != p9.ReadWrite {
var err error
f, err = reopenProcFd(l.file, openFlags|os.O_WRONLY)
if err != nil {
@@ -745,7 +727,7 @@ func (l *localFile) SetAttr(valid p9.SetAttrMask, attr p9.SetAttr) error {
}
}
- if l.ft == symlink {
+ if l.fileType == syscall.S_IFLNK {
// utimensat operates different that other syscalls. To operate on a
// symlink it *requires* AT_SYMLINK_NOFOLLOW with dirFD and a non-empty
// name.
@@ -929,7 +911,7 @@ func (l *localFile) Link(target p9.File, newName string) error {
}
// Mknod implements p9.File.
-func (l *localFile) Mknod(name string, mode p9.FileMode, _ uint32, _ uint32, uid p9.UID, gid p9.GID) (p9.QID, error) {
+func (l *localFile) Mknod(name string, mode p9.FileMode, _ uint32, _ uint32, _ p9.UID, _ p9.GID) (p9.QID, error) {
conf := l.attachPoint.conf
if conf.ROMount {
if conf.PanicOnWrite {
@@ -1127,13 +1109,13 @@ func (l *localFile) Connect(flags p9.ConnectFlags) (*fd.FD, error) {
}
if err := syscall.SetNonblock(f, true); err != nil {
- syscall.Close(f)
+ _ = syscall.Close(f)
return nil, err
}
sa := syscall.SockaddrUnix{Name: l.hostPath}
if err := syscall.Connect(f, &sa); err != nil {
- syscall.Close(f)
+ _ = syscall.Close(f)
return nil, err
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 11:22:45 +0000