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Added FUSE support #55

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Elara6331 merged 65 commits from yannickulrich/itd:fuse into master 2023-03-25 22:23:52 +00:00
Conversation 4 Commits 65 Files Changed 8 +14 -15
3 changed files with 14 additions and 15 deletions
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2
fuse.go
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@ -9,7 +9,7 @@ import (
"go.arsenm.dev/infinitime"
)
func startFuse(ctx context.Context, dev *infinitime.Device) error {
func startFUSE(ctx context.Context, dev *infinitime.Device) error {
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Elara6331 commented 2023-03-01 17:27:23 +00:00
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This function should be called startFUSE instead to adhere to Go naming conventions

This function should be called `startFUSE` instead to adhere to Go naming conventions
yannickulrich commented 2023-03-01 19:08:01 +00:00
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Thanks, I'm relatively new to Go, sorry for these issues

Done in 673383f

Thanks, I'm relatively new to Go, sorry for these issues Done in 673383f
// This is where we'll mount the FS
os.Mkdir(k.String("fuse.mountpoint"), 0755)
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Elara6331 commented 2023-03-08 23:44:18 +00:00
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Use os.MkdirAll here instead so that it creates parent directories, and handle the error (just return it).

Use `os.MkdirAll` here instead so that it creates parent directories, and handle the error (just return it).
yannickulrich commented 2023-03-11 13:29:49 +00:00
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This is actually a bit more complicated than that. If the mountpoint already exists, fuse will crash. We also can't delete the mountpoint beforehand (rm: cannot remove '/tmp/itd/mnt': Transport endpoint is not connected). The best way to solve this should be calling the unmount function. How would you suggest going about doing this?

This is actually a bit more complicated than that. If the mountpoint already exists, fuse will crash. We also can't delete the mountpoint beforehand (`rm: cannot remove '/tmp/itd/mnt': Transport endpoint is not connected`). The best way to solve this should be calling the [unmount function](https://pkg.go.dev/github.com/hanwen/go-fuse/v2@v2.2.0/fuse#Server.Unmount). How would you suggest going about doing this?
Elara6331 commented 2023-03-11 18:30:43 +00:00
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Yeah, this one is going to be a bit more complicated. The FUSE library does have a different unmount function that you could call before trying to mount the fs, but it's not exported, so we'll need to do a small hack to get access to it anyway. In the fusefs package, add a file called unmount.go with the following contents:

unmount.go 
package fusefs

import (
    _ "unsafe"

    "github.com/hanwen/go-fuse/v2/fuse"
)

func Unmount(mountPoint string) error {
    return unmount(mountPoint, &fuse.MountOptions{DirectMount: false})
}

// Unfortunately, the FUSE library does not export its unmount function,
// so this is required until that changes
//go:linkname unmount github.com/hanwen/go-fuse/v2/fuse.unmount
func unmount(mountPoint string, opts *fuse.MountOptions) error

Then, you can simply call that function at the top of startFUSE like so:

// Ignore the error because nothing might be mounted on the mountpoint
_ = fusefs.Unmount(k.String("fuse.mountpoint"))

I'll file an issue with the fuse library to export that function once this is merged.

The best way to solve this should be calling the unmount function.

I agree that this should be done. However, this doesn't solve the problem completely because if ITD panics for whatever reason, it won't get run and then the user will get a confusing message. Let me see what the best way would be to call this function on shutdown.

Yeah, this one is going to be a bit more complicated. The FUSE library does have [a different unmount function](https://github.com/hanwen/go-fuse/blob/0f728ba15b38579efefc3dc47821882ca18ffea7/fuse/mount_linux.go#L133) that you could call before trying to mount the fs, but it's not exported, so we'll need to do a small hack to get access to it anyway. In the `fusefs` package, add a file called `unmount.go` with the following contents: <details> <summary><code>unmount.go</code></summary> ```go package fusefs import ( _ "unsafe" "github.com/hanwen/go-fuse/v2/fuse" ) func Unmount(mountPoint string) error { return unmount(mountPoint, &fuse.MountOptions{DirectMount: false}) } // Unfortunately, the FUSE library does not export its unmount function, // so this is required until that changes //go:linkname unmount github.com/hanwen/go-fuse/v2/fuse.unmount func unmount(mountPoint string, opts *fuse.MountOptions) error ``` </details> Then, you can simply call that function at the top of `startFUSE` like so: ```go // Ignore the error because nothing might be mounted on the mountpoint _ = fusefs.Unmount(k.String("fuse.mountpoint")) ``` I'll file an issue with the fuse library to export that function once this is merged. > The best way to solve this should be calling the unmount function. I agree that this should be done. However, this doesn't solve the problem completely because if ITD panics for whatever reason, it won't get run and then the user will get a confusing message. Let me see what the best way would be to call this function on shutdown.
yannickulrich commented 2023-03-12 12:34:39 +00:00
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Cool, thank you! I have implemented this 🙂

Cool, thank you! I have implemented this 🙂
root := fusefs.BuildRootNode(dev)

25
internal/fusefs/fuse.go
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@ -36,6 +36,9 @@ type ITNode struct {
path string
}
var myfs *blefs.FS = nil
var inodemap map[string]uint64 = nil
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Elara6331 commented 2023-03-01 17:06:23 +00:00
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This error needs to be handled, you can just return it in this case and update the code that calls this function to do the actual handling

This error needs to be handled, you can just return it in this case and update the code that calls this function to do the actual handling
yannickulrich commented 2023-03-01 19:09:05 +00:00
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Done in a54ca7a

Done in a54ca7a
func BuildRootNode(dev *infinitime.Device) *ITNode {
inodemap = make(map[string]uint64)
myfs, _ = dev.FS()
@ -80,10 +83,6 @@ func BuildProperties(dev *infinitime.Device) {
}
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Elara6331 commented 2023-03-01 17:07:46 +00:00
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These variables should go above BuildRootNode because it's using them and it would be more readable that way. Also, Go doesn't require semicolons, you can remove those.

These variables should go above `BuildRootNode` because it's using them and it would be more readable that way. Also, Go doesn't require semicolons, you can remove those.
yannickulrich commented 2023-03-01 19:08:22 +00:00
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Done in 673383f

Done in 673383f
var myfs *blefs.FS = nil;
var inodemap map[string]uint64 = nil;
var _ = (fs.NodeReaddirer)((*ITNode)(nil))
// Readdir is part of the NodeReaddirer interface
@ -206,7 +205,7 @@ func (n *ITNode) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*
for _, file := range n.lst {
if file.path != n.path + "/" + name {
continue;
continue
}
log.Info("LookUp successful").Str("path", file.path).Send()
@ -230,7 +229,7 @@ func (n *ITNode) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*
child := n.NewInode(ctx, operations, stable)
return child, 0
}
break;
break
}
log.Warn("LookUp failed").Str("path", n.path + "/" + name).Send()
}
@ -298,7 +297,7 @@ func (fh *bytesFileWriteHandle) Flush(ctx context.Context) (errno syscall.Errno)
go func() {
// For every progress event
for sent := range fp.Progress() {
log.Info("Progress").Int("bytes", int(sent)).Int("of", len(fh.content)).Send();
log.Info("Progress").Int("bytes", int(sent)).Int("of", len(fh.content)).Send()
}
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Elara6331 commented 2023-03-01 17:23:16 +00:00
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- log.Info("Progress").Int("bytes", int(sent)).Int("of", len(fh.content)).Send()
+ log.Info("FUSE Write Progress").Int("bytes", int(sent)).Int("total", len(fh.content)).Send()
```diff - log.Info("Progress").Int("bytes", int(sent)).Int("of", len(fh.content)).Send() + log.Info("FUSE Write Progress").Int("bytes", int(sent)).Int("total", len(fh.content)).Send()
yannickulrich commented 2023-03-01 19:10:17 +00:00
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Done in b5328ec

Done in b5328ec
}()
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Elara6331 commented 2023-03-08 23:39:58 +00:00
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This is not correct. If no content has been written, you should still create the file because the user might want to create an empty file using a command like touch.

This is not correct. If no content has been written, you should still create the file because the user might want to create an empty file using a command like `touch`.
yannickulrich commented 2023-03-11 14:09:17 +00:00
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Oh, good point, thank you. Should be fixed now.

Oh, good point, thank you. Should be fixed now.
@ -330,7 +329,7 @@ func (fh *bytesFileWriteHandle) Fsync(ctx context.Context, flags uint32) (errno
var _ = (fs.NodeGetattrer)((*ITNode)(nil))
func (bn *ITNode) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
log.Info("getattr").Str("path", bn.path).Send();
log.Info("getattr").Str("path", bn.path).Send()
out.Ino = bn.Ino
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Elara6331 commented 2023-03-01 17:24:20 +00:00
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These should be debug logs rather than info logs. Also, the message should be a bit more specific, something like "FUSE getattr". Same for all the similar logs.

These should be debug logs rather than info logs. Also, the message should be a bit more specific, something like "FUSE getattr". Same for all the similar logs.
yannickulrich commented 2023-03-01 19:09:58 +00:00
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Done in b5328ec

Done in b5328ec
out.Mtime = bn.self.modtime
out.Ctime = bn.self.modtime
@ -342,8 +341,8 @@ func (bn *ITNode) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOu
var _ = (fs.NodeSetattrer)((*ITNode)(nil))
func (bn *ITNode) Setattr(ctx context.Context, fh fs.FileHandle, in *fuse.SetAttrIn, out *fuse.AttrOut) syscall.Errno {
log.Info("setattr").Str("path", bn.path).Send()
out.Size = 0;
out.Mtime = 0;
out.Size = 0
out.Mtime = 0
return 0
}
@ -365,10 +364,10 @@ func (f *ITNode) Open(ctx context.Context, openFlags uint32) (fh fs.FileHandle,
}
return fh, fuse.FOPEN_DIRECT_IO, 0
} else {
log.Info("Opening file: read").Str("path", f.path).Send();
log.Info("Opening file: read").Str("path", f.path).Send()
fp, err := myfs.Open(f.path)
if err != nil {
log.Error("Opening file failed").Str("path", f.path).Err(err).Send();
log.Error("Opening file failed").Str("path", f.path).Err(err).Send()
return nil, 0, syscall.EROFS
}
@ -379,7 +378,7 @@ func (f *ITNode) Open(ctx context.Context, openFlags uint32) (fh fs.FileHandle,
go func() {
// For every progress event
for sent := range fp.Progress() {
log.Info("Progress").Int("bytes", int(sent)).Int("of", int(f.self.size)).Send();
log.Info("Progress").Int("bytes", int(sent)).Int("of", int(f.self.size)).Send()
}
}()

2
main.go
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@ -188,7 +188,7 @@ func main() {
}
// Start fuse socket
if k.Bool("fuse.enabled") {
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Elara6331 commented 2023-03-01 17:26:43 +00:00
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FUSE should be started before the socket (socket should always be last)

FUSE should be started before the socket (socket should always be last)
yannickulrich commented 2023-03-01 19:10:37 +00:00
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Done in 3b96901

Done in 3b96901
err = startFuse(ctx, dev)
err = startFUSE(ctx, dev)
if err != nil {
log.Error("Error starting fuse socket").Err(err).Send()
}