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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 +24 -9
1 changed files with 24 additions and 9 deletions
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33
internal/fusefs/fuse.go
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@ -126,6 +126,7 @@ func (n *ITNode) Readdir(ctx context.Context) (fs.DirStream, syscall.Errno) {
files, err := myfs.ReadDir(n.path)
if err != nil {
log.Error("FUSE ReadDir failed").Str("path", n.path).Err(err).Send()
// TODO we probably should figure out why it failed
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yannickulrich commented 2023-03-01 19:47:16 +00:00
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How would you recommend doing this? I suppose it could fail for all sorts of reasons such as

  • no such file or directory ENOENT
  • generic input/output error EIO
  • invalid argument EINVAL
  • connection aborted ECONNABORTED
  • connection refused ECONNREFUSED
  • connection reset ECONNRESET
  • is actually a file EISNAM

In other places such as when we open a file, we could have

  • is actually a folder EISDIR
  • file exists EEXIST

Again, I'm sorry but I'm not a Go expert and don't really now how to do this properly.. especially when dealing with FSError

How would you recommend doing this? I suppose it could fail for all sorts of reasons such as * no such file or directory `ENOENT` * generic input/output error `EIO` * invalid argument `EINVAL` * connection aborted `ECONNABORTED` * connection refused `ECONNREFUSED` * connection reset `ECONNRESET` * is actually a file `EISNAM` In other places such as when we open a file, we could have * is actually a folder `EISDIR` * file exists `EEXIST` Again, I'm sorry but I'm not a Go expert and don't really now how to do this properly.. especially when dealing with `FSError`
Elara6331 commented 2023-03-01 23:34:33 +00:00
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The err can be several different kinds of errors, and FSError is just one of them. It's actually a type I made. You can see it here: https://gitea.arsenm.dev/Arsen6331/infinitime/src/commit/512d48bc2469/blefs/error.go#L20. It contains an error code you can check to see what went wrong, and you can scroll down to see the meaning of each code.

In this case, I'd use a Go type switch to check which error type actually occurred and then check the code or do whatever else needs to be done. Maybe there could be a function like syscallErr() that takes an error and returns the proper syscall error?

If you don't feel comfortable doing that, I can merge this and then implement it myself and send you the commit so you can see how I did it, or you can just try it yourself, whatever you feel would be better.

The `err` can be several different kinds of errors, and `FSError` is just one of them. It's actually a type I made. You can see it here: https://gitea.arsenm.dev/Arsen6331/infinitime/src/commit/512d48bc2469/blefs/error.go#L20. It contains an error code you can check to see what went wrong, and you can scroll down to see the meaning of each code. In this case, I'd use a Go type switch to check which error type actually occurred and then check the code or do whatever else needs to be done. Maybe there could be a function like `syscallErr()` that takes an `error` and returns the proper syscall error? If you don't feel comfortable doing that, I can merge this and then implement it myself and send you the commit so you can see how I did it, or you can just try it yourself, whatever you feel would be better.
yannickulrich commented 2023-03-04 09:22:23 +00:00
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Something like in 4c59561a99? There are a few TODO where I'm not sure what the correct POSIX error would be and improvised. If you have a better idea, feel free to change them though

Something like in 4c59561a99? There are a few `TODO` where I'm not sure what the correct POSIX error would be and improvised. If you have a better idea, feel free to change them though
Elara6331 commented 2023-03-12 20:10:54 +00:00
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That looks good, thanks

That looks good, thanks
return nil, syscall.ENOENT
}
@ -209,7 +210,6 @@ func (n *ITNode) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*
return child, 0
}
}
return nil, syscall.ENOENT
case 2:
// FS object
@ -290,6 +290,8 @@ var _ fs.FileWriter = (*bytesFileWriteHandle)(nil)
func (fh *bytesFileWriteHandle) Write(ctx context.Context, data []byte, off int64) (written uint32, errno syscall.Errno) {
log.Info("Executing Write").Str("path", fh.path).Int("prev_size", len(fh.content)).Int("next_size", len(data)).Send()
if off != int64(len(fh.content)) {
log.Error("FUSE Write file size changed unexpectedly").Int("expect", int(off)).Int("received", len(fh.content)).Send()
return 0, syscall.ENXIO
}
fh.content = append(fh.content[:], data[:]...)
return uint32(len(data)), 0
@ -320,17 +322,17 @@ func (fh *bytesFileWriteHandle) Flush(ctx context.Context) (errno syscall.Errno)
if err != nil {
log.Error("FUSE Flush failed during write").Str("path", fh.path).Err(err).Send()
fp.Close()
return syscall.EROFS
return syscall.EIO
}
if int(nread) != len(fh.content) {
log.Error("FUSE Flush failed during write").Str("path", fh.path).Int("expect", len(fh.content)).Int("got", int(nread)).Send()
fp.Close()
return syscall.EROFS
return syscall.EIO
}
err = fp.Close()
if err != nil {
yannickulrich marked this conversation as resolved
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
log.Error("FUSE Flush failed during close").Str("path", fh.path).Err(err).Send()
return syscall.EROFS
return syscall.EIO
}
log.Debug("FUSE Flush done").Str("path", fh.path).Int("size", len(fh.content)).Send()
@ -381,6 +383,7 @@ func (f *ITNode) Open(ctx context.Context, openFlags uint32) (fh fs.FileHandle,
log.Debug("FUSE Opening for read").Str("path", f.path).Send()
fp, err := myfs.Open(f.path)
if err != nil {
// TODO we probably should figure out why it failed
log.Error("FUSE: Opening failed").Str("path", f.path).Err(err).Send()
return nil, 0, syscall.EROFS
}
@ -400,7 +403,7 @@ func (f *ITNode) Open(ctx context.Context, openFlags uint32) (fh fs.FileHandle,
if err != nil {
log.Error("FUSE Read failed").Str("path", f.path).Err(err).Send()
fp.Close()
return nil, 0, syscall.EROFS
return nil, 0, syscall.EIO
}
fh = &bytesFileReadHandle{
@ -422,7 +425,8 @@ func (f *ITNode) Open(ctx context.Context, openFlags uint32) (fh fs.FileHandle,
sub_ctx, cancel := context.WithCancel(ctx)
ans, err := value.gen(sub_ctx)
if err != nil {
return nil, 0, syscall.EROFS
// TODO we probably should figure out why it failed
return nil, 0, syscall.EIO
}
fh = &sensorFileReadHandle{
@ -433,7 +437,7 @@ func (f *ITNode) Open(ctx context.Context, openFlags uint32) (fh fs.FileHandle,
}
}
}
return nil, 0, syscall.EROFS
return nil, 0, syscall.EINVAL
}
var _ fs.NodeCreater = (*ITNode)(nil)
@ -480,6 +484,7 @@ func (f *ITNode) Mkdir(ctx context.Context, name string, mode uint32, out *fuse.
Str("path", path).
Err(err).
Send()
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Elara6331 commented 2023-03-01 17:25:14 +00:00
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Minor typo, it's "success"

Minor typo, it's "success"
yannickulrich commented 2023-03-01 19:10:06 +00:00
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Done in b5328ec

Done in b5328ec
// TODO we probably should figure out why it failed
return nil, syscall.EROFS
}
@ -505,6 +510,10 @@ func (f *ITNode) Mkdir(ctx context.Context, name string, mode uint32, out *fuse.
var _ fs.NodeRenamer = (*ITNode)(nil)
func (f *ITNode) Rename(ctx context.Context, name string, newParent fs.InodeEmbedder, newName string, flags uint32) syscall.Errno {
if f.kind != 2 {
return syscall.EROFS
}
p1 := f.path + "/" + name
p2 := newParent.EmbeddedInode().Path(nil)[2:] + "/" + newName
@ -516,7 +525,8 @@ func (f *ITNode) Rename(ctx context.Context, name string, newParent fs.InodeEmbe
Err(err).
Send()
return syscall.EROFS
// TODO we probably should figure out why it failed
return syscall.EIO
}
log.Debug("FUSE Rename sucess").
Str("src", p1).
@ -532,6 +542,10 @@ func (f *ITNode) Rename(ctx context.Context, name string, newParent fs.InodeEmbe
var _ fs.NodeUnlinker = (*ITNode)(nil)
func (f *ITNode) Unlink(ctx context.Context, name string) syscall.Errno {
if f.kind != 2 {
return syscall.EROFS
}
delete(inodemap, f.path + "/" + name)
err := myfs.Remove(f.path + "/" + name)
if err != nil {
@ -540,7 +554,8 @@ func (f *ITNode) Unlink(ctx context.Context, name string) syscall.Errno {
Err(err).
Send()
return syscall.EROFS
// TODO we probably should figure out why it failed
return syscall.EIO
}
log.Debug("FUSE Unlink success").