fix getxattr and listxattr (#72)
previously, this will fail if /mnt/file doesn't have an xattr: ``` listxattr("/mnt/file", 0x7fe8b3686830, 256) = -1 EIO (Input/output error) ``` We should be returning the actual size only if the input size is zero. Related issue is if the filesystem returns ERANGE, we should propagate that error instead of returning the actual size. Replaced go-xattr usage with x/sys/unix so we can test this.geesefs-0-30-9
parent
4ee1cf7f62
commit
e7bcad2083
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@ -603,17 +603,6 @@ func (c *Connection) kernelResponse(
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if opErr != nil {
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handled := false
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if opErr == syscall.ERANGE {
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switch o := op.(type) {
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case *fuseops.GetXattrOp:
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writeXattrSize(m, uint32(o.BytesRead))
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handled = true
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case *fuseops.ListXattrOp:
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writeXattrSize(m, uint32(o.BytesRead))
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handled = true
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}
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}
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if !handled {
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m.OutHeader().Error = -int32(syscall.EIO)
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if errno, ok := opErr.(syscall.Errno); ok {
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@ -792,14 +781,14 @@ func (c *Connection) kernelResponseForOp(
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// convertInMessage already set up the destination buffer to be at the end
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// of the out message. We need only shrink to the right size based on how
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// much the user read.
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if o.BytesRead == 0 {
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if len(o.Dst) == 0 {
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writeXattrSize(m, uint32(o.BytesRead))
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} else {
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m.ShrinkTo(buffer.OutMessageHeaderSize + o.BytesRead)
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}
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case *fuseops.ListXattrOp:
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if o.BytesRead == 0 {
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if len(o.Dst) == 0 {
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writeXattrSize(m, uint32(o.BytesRead))
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} else {
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m.ShrinkTo(buffer.OutMessageHeaderSize + o.BytesRead)
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@ -26,6 +26,7 @@ import (
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"github.com/jacobsa/fuse/fuseops"
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"github.com/jacobsa/fuse/fuseutil"
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"github.com/jacobsa/syncutil"
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"golang.org/x/sys/unix"
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)
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type memFS struct {
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@ -679,7 +680,7 @@ func (fs *memFS) GetXattr(ctx context.Context,
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op.BytesRead = len(value)
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if len(op.Dst) >= len(value) {
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copy(op.Dst, value)
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} else {
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} else if len(op.Dst) != 0 {
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err = syscall.ERANGE
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}
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} else {
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@ -703,8 +704,8 @@ func (fs *memFS) ListXattr(ctx context.Context,
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if err == nil && len(dst) >= keyLen {
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copy(dst, key)
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dst = dst[keyLen:]
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} else {
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err = syscall.ERANGE
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} else if len(op.Dst) != 0 {
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return syscall.ERANGE
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}
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op.BytesRead += keyLen
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}
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@ -735,11 +736,11 @@ func (fs *memFS) SetXattr(ctx context.Context,
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_, ok := inode.xattrs[op.Name]
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switch op.Flags {
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case 0x1:
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case unix.XATTR_CREATE:
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if ok {
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err = fuse.EEXIST
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}
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case 0x2:
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case unix.XATTR_REPLACE:
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if !ok {
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err = fuse.ENOATTR
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}
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@ -35,7 +35,7 @@ import (
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"github.com/jacobsa/fuse/samples/memfs"
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. "github.com/jacobsa/oglematchers"
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. "github.com/jacobsa/ogletest"
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"github.com/kahing/go-xattr"
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"golang.org/x/sys/unix"
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)
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func TestMemFS(t *testing.T) { RunTests(t) }
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@ -1792,6 +1792,8 @@ func (t *MemFSTest) RenameNonExistentFile() {
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func (t *MemFSTest) NoXattrs() {
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var err error
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var sz int
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var smallBuf [1]byte
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// Create a file.
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filePath := path.Join(t.Dir, "foo")
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@ -1799,53 +1801,69 @@ func (t *MemFSTest) NoXattrs() {
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AssertEq(nil, err)
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// List xattr names.
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names, err := xattr.List(filePath)
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sz, err = unix.Listxattr(filePath, nil)
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AssertEq(nil, err)
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ExpectThat(names, ElementsAre())
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AssertEq(0, sz)
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// Attempt to read a non-existent xattr.
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_, err = xattr.Getxattr(filePath, "foo", nil)
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_, err = unix.Getxattr(filePath, "foo", nil)
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ExpectEq(fuse.ENOATTR, err)
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// Attempt to read a non-existent xattr with a buf.
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_, err = unix.Getxattr(filePath, "foo", smallBuf[:])
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ExpectEq(fuse.ENOATTR, err)
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// List xattr names with a buf.
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sz, err = unix.Listxattr(filePath, smallBuf[:])
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AssertEq(nil, err)
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ExpectEq(0, sz)
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}
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func (t *MemFSTest) SetXAttr() {
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var err error
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var sz int
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var buf [1024]byte
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// Create a file.
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filePath := path.Join(t.Dir, "foo")
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err = ioutil.WriteFile(filePath, []byte("taco"), 0600)
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AssertEq(nil, err)
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err = xattr.Setxattr(filePath, "foo", []byte("bar"), xattr.REPLACE)
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err = unix.Setxattr(filePath, "foo", []byte("bar"), unix.XATTR_REPLACE)
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AssertEq(fuse.ENOATTR, err)
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err = xattr.Setxattr(filePath, "foo", []byte("bar"), xattr.CREATE)
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err = unix.Setxattr(filePath, "foo", []byte("bar"), unix.XATTR_CREATE)
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AssertEq(nil, err)
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value, err := xattr.Get(filePath, "foo")
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AssertEq(nil, err)
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AssertEq("bar", string(value))
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// List xattr with a buf that is too small.
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_, err = unix.Listxattr(filePath, buf[:1])
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ExpectEq(unix.ERANGE, err)
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err = xattr.Setxattr(filePath, "foo", []byte("hello world"), xattr.REPLACE)
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// List xattr to ask for name size.
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sz, err = unix.Listxattr(filePath, nil)
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AssertEq(nil, err)
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AssertEq(4, sz)
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value, err = xattr.Get(filePath, "foo")
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// List xattr names.
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sz, err = unix.Listxattr(filePath, buf[:sz])
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AssertEq(nil, err)
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AssertEq("hello world", string(value))
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AssertEq(4, sz)
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AssertEq("foo\000", string(buf[:sz]))
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names, err := xattr.List(filePath)
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AssertEq(nil, err)
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AssertEq(1, len(names))
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AssertEq("foo", names[0])
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// Read xattr with a buf that is too small.
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_, err = unix.Getxattr(filePath, "foo", buf[:1])
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ExpectEq(unix.ERANGE, err)
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err = xattr.Setxattr(filePath, "bar", []byte("hello world"), 0x0)
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// Read xattr to ask for value size.
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sz, err = unix.Getxattr(filePath, "foo", nil)
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AssertEq(nil, err)
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AssertEq(3, sz)
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names, err = xattr.List(filePath)
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// Read xattr value.
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sz, err = unix.Getxattr(filePath, "foo", buf[:sz])
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AssertEq(nil, err)
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AssertEq(2, len(names))
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ExpectThat(names, Contains("foo"))
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ExpectThat(names, Contains("bar"))
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AssertEq(3, sz)
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AssertEq("bar", string(buf[:sz]))
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}
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func (t *MemFSTest) RemoveXAttr() {
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@ -1856,16 +1874,16 @@ func (t *MemFSTest) RemoveXAttr() {
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err = ioutil.WriteFile(filePath, []byte("taco"), 0600)
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AssertEq(nil, err)
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err = xattr.Removexattr(filePath, "foo")
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err = unix.Removexattr(filePath, "foo")
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AssertEq(fuse.ENOATTR, err)
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err = xattr.Setxattr(filePath, "foo", []byte("bar"), xattr.CREATE)
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err = unix.Setxattr(filePath, "foo", []byte("bar"), unix.XATTR_CREATE)
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AssertEq(nil, err)
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err = xattr.Removexattr(filePath, "foo")
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err = unix.Removexattr(filePath, "foo")
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AssertEq(nil, err)
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_, err = xattr.Getxattr(filePath, "foo", nil)
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_, err = unix.Getxattr(filePath, "foo", nil)
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AssertEq(fuse.ENOATTR, err)
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}
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