hardcoresushi/libgocryptfs
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fusefrontend: Use Linkat syscall to implement Link

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This commit is contained in:
Sebastian Lackner 2017-12-12 14:42:49 +01:00 committed by rfjakob
parent a24342f656
commit a85dbcab38
2 changed files with 18 additions and 16 deletions
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27
internal/fusefrontend/fs.go
View File

@ -540,35 +540,32 @@ func (fs *FS) Link(oldPath string, newPath string, context *fuse.Context) (code
if fs.isFiltered(newPath) {
return fuse.EPERM
}
cOldPath, err := fs.getBackingPath(oldPath)
oldDirFd, cOldName, err := fs.openBackingPath(oldPath)
if err != nil {
return fuse.ToStatus(err)
}
cNewPath, err := fs.getBackingPath(newPath)
defer oldDirFd.Close()
newDirFd, cNewName, err := fs.openBackingPath(newPath)
if err != nil {
return fuse.ToStatus(err)
}
// Handle long file name
cNewName := filepath.Base(cNewPath)
defer newDirFd.Close()
// Handle long file name (except in PlaintextNames mode)
if !fs.args.PlaintextNames && nametransform.IsLongContent(cNewName) {
dirfd, err := os.Open(filepath.Dir(cNewPath))
err = fs.nameTransform.WriteLongName(newDirFd, cNewName, newPath)
if err != nil {
return fuse.ToStatus(err)
}
defer dirfd.Close()
err = fs.nameTransform.WriteLongName(dirfd, cNewName, newPath)
// Create "gocryptfs.longfile." link
err = syscallcompat.Linkat(int(oldDirFd.Fd()), cOldName, int(newDirFd.Fd()), cNewName, 0)
if err != nil {
return fuse.ToStatus(err)
nametransform.DeleteLongName(newDirFd, cNewName)
}
// TODO Use syscall.Linkat once it is available in Go (it is not in Go
// 1.6).
err = syscall.Link(cOldPath, cNewPath)
if err != nil {
nametransform.DeleteLongName(dirfd, cNewName)
} else {
// Create regular link
err = syscallcompat.Linkat(int(oldDirFd.Fd()), cOldName, int(newDirFd.Fd()), cNewName, 0)
}
return fuse.ToStatus(err)
}
return fuse.ToStatus(os.Link(cOldPath, cNewPath))
}
// Access implements pathfs.Filesystem.

5
internal/syscallcompat/sys_common.go
View File

@ -38,3 +38,8 @@ func Faccessat(dirfd int, path string, mode uint32) error {
}
return unix.Faccessat(dirfd, path, mode, 0)
}
// Linkat exists both in Linux and in MacOS 10.10+.
func Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
return unix.Linkat(olddirfd, oldpath, newdirfd, newpath, flags)
}