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path: root/internal/fusefrontend/node_open_create.go
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Diffstat (limited to 'internal/fusefrontend/node_open_create.go')
-rw-r--r--internal/fusefrontend/node_open_create.go108
1 files changed, 108 insertions, 0 deletions
diff --git a/internal/fusefrontend/node_open_create.go b/internal/fusefrontend/node_open_create.go
new file mode 100644
index 0000000..8b31932
--- /dev/null
+++ b/internal/fusefrontend/node_open_create.go
@@ -0,0 +1,108 @@
+package fusefrontend
+
+import (
+ "context"
+ "syscall"
+
+ "github.com/hanwen/go-fuse/v2/fs"
+ "github.com/hanwen/go-fuse/v2/fuse"
+
+ "github.com/rfjakob/gocryptfs/internal/nametransform"
+ "github.com/rfjakob/gocryptfs/internal/syscallcompat"
+ "github.com/rfjakob/gocryptfs/internal/tlog"
+)
+
+// Open - FUSE call. Open already-existing file.
+//
+// Symlink-safe through Openat().
+func (n *Node) Open(ctx context.Context, flags uint32) (fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
+ dirfd, cName, errno := n.prepareAtSyscall("")
+ if errno != 0 {
+ return
+ }
+ defer syscall.Close(dirfd)
+
+ rn := n.rootNode()
+ newFlags := rn.mangleOpenFlags(flags)
+ // Taking this lock makes sure we don't race openWriteOnlyFile()
+ rn.openWriteOnlyLock.RLock()
+ defer rn.openWriteOnlyLock.RUnlock()
+
+ if rn.args.KernelCache {
+ fuseFlags = fuse.FOPEN_KEEP_CACHE
+ }
+
+ // Open backing file
+ fd, err := syscallcompat.Openat(dirfd, cName, newFlags, 0)
+ // Handle a few specific errors
+ if err != nil {
+ if err == syscall.EMFILE {
+ var lim syscall.Rlimit
+ syscall.Getrlimit(syscall.RLIMIT_NOFILE, &lim)
+ tlog.Warn.Printf("Open %q: too many open files. Current \"ulimit -n\": %d", cName, lim.Cur)
+ }
+ if err == syscall.EACCES && (int(flags)&syscall.O_ACCMODE) == syscall.O_WRONLY {
+ fd, err = rn.openWriteOnlyFile(dirfd, cName, newFlags)
+ }
+ }
+ // Could not handle the error? Bail out
+ if err != nil {
+ errno = fs.ToErrno(err)
+ return
+ }
+ fh, _, errno = NewFile(fd, cName, rn)
+ return fh, fuseFlags, errno
+}
+
+// Create - FUSE call. Creates a new file.
+//
+// Symlink-safe through the use of Openat().
+func (n *Node) Create(ctx context.Context, name string, flags uint32, mode uint32, out *fuse.EntryOut) (inode *fs.Inode, fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
+ dirfd, cName, errno := n.prepareAtSyscall(name)
+ if errno != 0 {
+ return
+ }
+ defer syscall.Close(dirfd)
+
+ var err error
+ fd := -1
+ // Make sure context is nil if we don't want to preserve the owner
+ rn := n.rootNode()
+ if !rn.args.PreserveOwner {
+ ctx = nil
+ }
+ newFlags := rn.mangleOpenFlags(flags)
+ // Handle long file name
+ ctx2 := toFuseCtx(ctx)
+ if !rn.args.PlaintextNames && nametransform.IsLongContent(cName) {
+ // Create ".name"
+ err = rn.nameTransform.WriteLongNameAt(dirfd, cName, name)
+ if err != nil {
+ return nil, nil, 0, fs.ToErrno(err)
+ }
+ // Create content
+ fd, err = syscallcompat.OpenatUser(dirfd, cName, newFlags|syscall.O_CREAT|syscall.O_EXCL, mode, ctx2)
+ if err != nil {
+ nametransform.DeleteLongNameAt(dirfd, cName)
+ }
+ } else {
+ // Create content, normal (short) file name
+ fd, err = syscallcompat.OpenatUser(dirfd, cName, newFlags|syscall.O_CREAT|syscall.O_EXCL, mode, ctx2)
+ }
+ if err != nil {
+ // xfstests generic/488 triggers this
+ if err == syscall.EMFILE {
+ var lim syscall.Rlimit
+ syscall.Getrlimit(syscall.RLIMIT_NOFILE, &lim)
+ tlog.Warn.Printf("Create %q: too many open files. Current \"ulimit -n\": %d", cName, lim.Cur)
+ }
+ return nil, nil, 0, fs.ToErrno(err)
+ }
+
+ fh, st, errno := NewFile(fd, cName, rn)
+ if errno != 0 {
+ return
+ }
+ inode = n.newChild(ctx, st, out)
+ return inode, fh, fuseFlags, errno
+}