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local: implement --local-no-sparse flag for disabling sparse files #2469

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This also introduces a one time warning for sparse files and updates
the docs to warn about them.
This commit is contained in:
Nick Craig-Wood 2020-05-19 10:16:43 +01:00
parent 5cb2a2fa3c
commit 610f40f700
2 changed files with 28 additions and 4 deletions
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18
backend/local/local.go
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@ -118,6 +118,16 @@ Windows/macOS and case sensitive for everything else. Use this flag
to override the default choice.`,
Default: false,
Advanced: true,
}, {
Name: "no_sparse",
Help: `Disable sparse files for multi-thread downloads
On Windows platforms rclone will make sparse files when doing
multi-thread downloads. This avoids long pauses on large files where
the OS zeros the file. However sparse files may be undesirable as they
cause disk fragmentation and can be slow to work with.`,
Default: false,
Advanced: true,
}, {
Name: config.ConfigEncoding,
Help: config.ConfigEncodingHelp,
@ -139,6 +149,7 @@ type Options struct {
OneFileSystem bool `config:"one_file_system"`
CaseSensitive bool `config:"case_sensitive"`
CaseInsensitive bool `config:"case_insensitive"`
NoSparse bool `config:"no_sparse"`
Enc encoder.MultiEncoder `config:"encoding"`
}
@ -1095,6 +1106,8 @@ func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, op
return o.lstat()
}
var sparseWarning sync.Once
// OpenWriterAt opens with a handle for random access writes
//
// Pass in the remote desired and the size if known.
@ -1122,11 +1135,16 @@ func (f *Fs) OpenWriterAt(ctx context.Context, remote string, size int64) (fs.Wr
if err != nil {
fs.Debugf(o, "Failed to pre-allocate: %v", err)
}
if !f.opt.NoSparse && file.SetSparseImplemented {
sparseWarning.Do(func() {
fs.Infof(nil, "Writing sparse files: use --local-no-sparse or --multi-thread-streams 0 to disable")
})
// Set the file to be a sparse file (important on Windows)
err = file.SetSparse(out)
if err != nil {
fs.Debugf(o, "Failed to set sparse: %v", err)
}
}
return out, nil
}

6
docs/content/docs.md
View File

@ -844,6 +844,12 @@ with any source.
as they are faster without unless `--multi-thread-streams` is set
explicitly.
**NB** on Windows using multi-thread downloads will cause the
resulting files to be [sparse](https://en.wikipedia.org/wiki/Sparse_file).
Use `--local-no-sparse` to disable sparse files (which may cause long
delays at the start of downloads) or disable multi-thread downloads
with `--multi-thread-streams 0`
### --multi-thread-streams=N ###
When using multi thread downloads (see above `--multi-thread-cutoff`)