91 lines
2.0 KiB
Go
91 lines
2.0 KiB
Go
//+build linux
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/*
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Small tool to try to debug unix.Getdents problems on CIFS mounts
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( https://github.com/rfjakob/gocryptfs/issues/483 )
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Example output:
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$ while sleep 1 ; do ./getdents /mnt/synology/public/tmp/g1 ; done
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=3192, err=<nil>
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unix.Getdents fd3: n=0, err=<nil>
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total 24072 bytes
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=-1, err=no such file or directory
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total 16704 bytes
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=4176, err=<nil>
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unix.Getdents fd3: n=3192, err=<nil>
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unix.Getdents fd3: n=0, err=<nil>
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total 24072 bytes
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Failure looks like this in strace:
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[pid 189974] getdents64(6, 0xc000105808, 10000) = -1 ENOENT (No such file or directory)
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*/
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package main
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import (
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"flag"
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"fmt"
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"os"
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"time"
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"golang.org/x/sys/unix"
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)
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const (
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myName = "getdents"
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)
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func main() {
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flag.Usage = func() {
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fmt.Fprintf(os.Stderr, "Usage: %s PATH\n", myName)
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fmt.Fprintf(os.Stderr, "Run getdents(2) on PATH in a 100ms loop until we hit an error\n")
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os.Exit(1)
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}
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flag.Parse()
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if flag.NArg() != 1 {
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flag.Usage()
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}
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path := flag.Arg(0)
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tmp := make([]byte, 10000)
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for i := 1; ; i++ {
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sum := 0
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fd, err := unix.Open(path, unix.O_RDONLY, 0)
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if err != nil {
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fmt.Printf("%3d: unix.Open returned err=%v\n", i, err)
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os.Exit(1)
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}
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fmt.Printf("%3d: unix.Getdents: ", i)
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for {
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n, err := unix.Getdents(fd, tmp)
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fmt.Printf("n=%d; ", n)
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if n <= 0 {
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fmt.Printf("err=%v; total %d bytes\n", err, sum)
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if err != nil {
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os.Exit(1)
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}
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break
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}
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sum += n
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}
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unix.Close(fd)
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time.Sleep(100 * time.Millisecond)
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}
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}
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