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Updated Mount.

geesefs-0-30-9
Aaron Jacobs 2015-03-24 15:16:55 +11:00
parent 94292e49fe
commit 9f9e950d17
1 changed files with 19 additions and 28 deletions
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47
mounted_file_system.go
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@ -22,6 +22,10 @@ import (
"golang.org/x/net/context"
)
// A Server is a function that reads ops from the supplied Connection,
// responding to them as appropriate.
type Server func(*Connection)
// A struct representing the status of a mount operation, with a method that
// waits for unmounting.
type MountedFileSystem struct {
@ -43,22 +47,9 @@ func (mfs *MountedFileSystem) Dir() string {
return mfs.dir
}
// Wait until the mount point is ready to be used. After a successful return
// from this function, the contents of the mounted file system should be
// visible in the directory supplied to NewMountPoint. May be called multiple
// times.
func (mfs *MountedFileSystem) WaitForReady(ctx context.Context) error {
select {
case <-mfs.readyStatusAvailable:
return mfs.readyStatus
case <-ctx.Done():
return ctx.Err()
}
}
// Block until a mounted file system has been unmounted. The return value will
// be non-nil if anything unexpected happened while serving. May be called
// multiple times. Must not be called unless WaitForReady has returned nil.
// multiple times.
func (mfs *MountedFileSystem) Join(ctx context.Context) error {
select {
case <-mfs.joinStatusAvailable:
@ -69,8 +60,10 @@ func (mfs *MountedFileSystem) Join(ctx context.Context) error {
}
// Attempt to unmount the file system. Use Join to wait for it to actually be
// unmounted. You must first call WaitForReady to ensure there is no race with
// mounting.
// unmounted.
//
// TODO(jacobsa): Kill this in favor of an Unmount free function that can be
// used even from outside of the daemon process.
func (mfs *MountedFileSystem) Unmount() error {
return bazilfuse.Unmount(mfs.dir)
}
@ -147,21 +140,15 @@ func (c *MountConfig) bazilfuseOptions() (opts []bazilfuse.MountOption) {
return
}
// Attempt to mount the supplied file system on the given directory.
// mfs.WaitForReady() must be called to find out whether the mount was
// successful.
//
// TODO(jacobsa): Fold in WaitForReady. See issue #3.
// Attempt to mount a file system on the given directory, using the supplied
// Server to serve connection requests. This function blocks until the file
// system is successfully mounted. On some systems, this requires the supplied
// Server to make forward progress (in particular, to respond to
// fuseops.InitOp).
func Mount(
dir string,
fs FileSystem,
server Server,
config *MountConfig) (mfs *MountedFileSystem, err error) {
// Create a server object.
server, err := newServer(fs)
if err != nil {
return
}
// Initialize the struct.
mfs = &MountedFileSystem{
dir: dir,
@ -172,5 +159,9 @@ func Mount(
// Mount in the background.
go mfs.mountAndServe(server, config.bazilfuseOptions())
// Wait for ready.
<-mfs.readyStatusAvailable
err = mfs.readyStatus
return
}