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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| /atomicrename |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "flag" | ||
| "fmt" | ||
| "io/ioutil" | ||
| "os" | ||
| "strings" | ||
| "sync/atomic" | ||
| "syscall" | ||
| ) | ||
|
|
||
| const fileCount = 100 | ||
|
|
||
| type stats struct { | ||
| renameOk int | ||
| renameError int | ||
| readOk int | ||
| readError int | ||
| readContentMismatch int | ||
| } | ||
|
|
||
| func usage() { | ||
| fmt.Printf(`atomicrename creates %d "src" files in the current directory, renames | ||
| them in random order over a single "dst" file while reading the "dst" | ||
| file concurrently in a loop. | ||
| Progress and errors are reported as they occour in addition to a summary | ||
| printed at the end. cifs and fuse filesystems are known to fail, local | ||
| filesystems and nfs seem ok. | ||
| See https://github.com/hanwen/go-fuse/issues/398 for background info. | ||
| `, fileCount) | ||
| os.Exit(1) | ||
| } | ||
|
|
||
| func main() { | ||
| flag.Usage = usage | ||
| flag.Parse() | ||
|
|
||
| hello := []byte("hello world") | ||
| srcFiles := make(map[string]struct{}) | ||
|
|
||
| // prepare source files | ||
| fmt.Print("creating files") | ||
| for i := 0; i < fileCount; i++ { | ||
| srcName := fmt.Sprintf("src.atomicrename.%d", i) | ||
| srcFiles[srcName] = struct{}{} | ||
| buf := bytes.Repeat([]byte("_"), i) | ||
| buf = append(buf, hello...) | ||
| if err := ioutil.WriteFile(srcName, buf, 0600); err != nil { | ||
| panic(err) | ||
| } | ||
| fmt.Print(".") | ||
| } | ||
| fmt.Print("\n") | ||
|
|
||
| // prepare destination file | ||
| const dstName = "dst.atomicrename" | ||
| if err := ioutil.WriteFile(dstName, hello, 0600); err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| var running int32 = 1 | ||
|
|
||
| stats := stats{} | ||
|
|
||
| // read thread | ||
| go func() { | ||
| for atomic.LoadInt32(&running) == 1 { | ||
| have, err := ioutil.ReadFile(dstName) | ||
| if err != nil { | ||
| fmt.Println(err) | ||
| stats.readError++ | ||
| continue | ||
| } | ||
| if !strings.HasSuffix(string(have), string(hello)) { | ||
| fmt.Printf("content mismatch: have %q\n", have) | ||
| stats.readContentMismatch++ | ||
| continue | ||
| } | ||
| fmt.Printf("content ok len=%d\n", len(have)) | ||
| stats.readOk++ | ||
| } | ||
| }() | ||
|
|
||
| // rename thread = main thread | ||
| for srcName := range srcFiles { | ||
| if err := os.Rename(srcName, dstName); err != nil { | ||
| fmt.Println(err) | ||
| stats.renameError++ | ||
| } | ||
| stats.renameOk++ | ||
| } | ||
| // Signal the Read goroutine to stop when loop is done | ||
| atomic.StoreInt32(&running, 0) | ||
|
|
||
| syscall.Unlink(dstName) | ||
| fmt.Printf("stats: %#v\n", stats) | ||
| } |
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| @@ -0,0 +1 @@ | ||
| /findholes |
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