libgocryptfs/internal/fusefrontend/node_xattr_darwin.go
Jakob Unterwurzacher 84e702126a fusefrontend: implement recursive diriv caching
The new contrib/maxlen.bash showed that we have exponential
runtime with respect to directory depth.

The new recursive diriv caching is a lot smarter as it caches
intermediate lookups. maxlen.bash now completes in a few seconds.

xfstests results same as
2d158e4c82/screenlog.0 :

  Failures: generic/035 generic/062 generic/080 generic/093 generic/099 generic/215 generic/285 generic/319 generic/426 generic/444 generic/467 generic/477 generic/523
  Failed 13 of 580 tests

benchmark.bash results are identical:

  $ ./benchmark.bash
  Testing gocryptfs at /tmp/benchmark.bash.BdQ: gocryptfs v2.0.1-17-g6b09bc0; go-fuse v2.1.1-0.20210611132105-24a1dfe6b4f8; 2021-06-25 go1.16.5 linux/amd64
  /tmp/benchmark.bash.BdQ.mnt is a mountpoint
  WRITE: 262144000 bytes (262 MB, 250 MiB) copied, 0,4821 s, 544 MB/s
  READ:  262144000 bytes (262 MB, 250 MiB) copied, 0,266061 s, 985 MB/s
  UNTAR: 8,280
  MD5:   4,564
  LS:    1,745
  RM:    2,244
2021-06-25 13:56:53 +02:00

108 lines
2.7 KiB
Go

package fusefrontend
import (
"syscall"
"golang.org/x/sys/unix"
"github.com/hanwen/go-fuse/v2/fs"
"github.com/hanwen/go-fuse/v2/fuse"
"github.com/rfjakob/gocryptfs/internal/syscallcompat"
)
// On Darwin we have to unset XATTR_NOSECURITY 0x0008
func filterXattrSetFlags(flags int) int {
// See https://opensource.apple.com/source/xnu/xnu-1504.15.3/bsd/sys/xattr.h.auto.html
const XATTR_NOSECURITY = 0x0008
return flags &^ XATTR_NOSECURITY
}
func (n *Node) getXAttr(cAttr string) (out []byte, errno syscall.Errno) {
dirfd, cName, errno := n.prepareAtSyscallMyself()
if errno != 0 {
return
}
defer syscall.Close(dirfd)
// O_NONBLOCK to not block on FIFOs.
fd, err := syscallcompat.Openat(dirfd, cName, syscall.O_RDONLY|syscall.O_NONBLOCK, 0)
if err != nil {
return nil, fs.ToErrno(err)
}
defer syscall.Close(fd)
cData, err := syscallcompat.Fgetxattr(fd, cAttr)
if err != nil {
return nil, fs.ToErrno(err)
}
return cData, 0
}
func (n *Node) setXAttr(context *fuse.Context, cAttr string, cData []byte, flags uint32) (errno syscall.Errno) {
dirfd, cName, errno := n.prepareAtSyscallMyself()
if errno != 0 {
return
}
defer syscall.Close(dirfd)
// O_NONBLOCK to not block on FIFOs.
fd, err := syscallcompat.Openat(dirfd, cName, syscall.O_WRONLY|syscall.O_NONBLOCK, 0)
// Directories cannot be opened read-write. Retry.
if err == syscall.EISDIR {
fd, err = syscallcompat.Openat(dirfd, cName, syscall.O_RDONLY|syscall.O_DIRECTORY|syscall.O_NONBLOCK, 0)
}
if err != nil {
fs.ToErrno(err)
}
defer syscall.Close(fd)
err = unix.Fsetxattr(fd, cAttr, cData, int(flags))
return fs.ToErrno(err)
}
func (n *Node) removeXAttr(cAttr string) (errno syscall.Errno) {
dirfd, cName, errno := n.prepareAtSyscallMyself()
if errno != 0 {
return
}
defer syscall.Close(dirfd)
// O_NONBLOCK to not block on FIFOs.
fd, err := syscallcompat.Openat(dirfd, cName, syscall.O_WRONLY|syscall.O_NONBLOCK, 0)
// Directories cannot be opened read-write. Retry.
if err == syscall.EISDIR {
fd, err = syscallcompat.Openat(dirfd, cName, syscall.O_RDONLY|syscall.O_DIRECTORY|syscall.O_NONBLOCK, 0)
}
if err != nil {
return fs.ToErrno(err)
}
defer syscall.Close(fd)
err = unix.Fremovexattr(fd, cAttr)
return fs.ToErrno(err)
}
func (n *Node) listXAttr() (out []string, errno syscall.Errno) {
dirfd, cName, errno := n.prepareAtSyscallMyself()
if errno != 0 {
return
}
defer syscall.Close(dirfd)
// O_NONBLOCK to not block on FIFOs.
fd, err := syscallcompat.Openat(dirfd, cName, syscall.O_RDONLY|syscall.O_NONBLOCK, 0)
if err != nil {
return nil, fs.ToErrno(err)
}
defer syscall.Close(fd)
cNames, err := syscallcompat.Flistxattr(fd)
if err != nil {
return nil, fs.ToErrno(err)
}
return cNames, 0
}