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vfs: decode flags in Open/OpenFile for debug

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This commit is contained in:
Nick Craig-Wood
2017-11-14 21:00:08 +00:00
parent f5f8c0c438
commit e7f2935333
3 changed files with 39 additions and 2 deletions
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37
vfs/vfs.go
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@@ -306,8 +306,45 @@ func (vfs *VFS) StatParent(name string) (dir *Dir, leaf string, err error) {
return dir, leaf, nil
}
// decodeOpenFlags returns a string representing the open flags
func decodeOpenFlags(flags int) string {
var out []string
rdwrMode := flags & accessModeMask
switch rdwrMode {
case os.O_RDONLY:
out = append(out, "O_RDONLY")
case os.O_WRONLY:
out = append(out, "O_WRONLY")
case os.O_RDWR:
out = append(out, "O_RDWR")
default:
out = append(out, fmt.Sprintf("0x%X", rdwrMode))
}
if flags&os.O_APPEND != 0 {
out = append(out, "O_APPEND")
}
if flags&os.O_CREATE != 0 {
out = append(out, "O_CREATE")
}
if flags&os.O_EXCL != 0 {
out = append(out, "O_EXCL")
}
if flags&os.O_SYNC != 0 {
out = append(out, "O_SYNC")
}
if flags&os.O_TRUNC != 0 {
out = append(out, "O_TRUNC")
}
flags &^= accessModeMask | os.O_APPEND | os.O_CREATE | os.O_EXCL | os.O_SYNC | os.O_TRUNC
if flags != 0 {
out = append(out, fmt.Sprintf("0x%X", flags))
}
return strings.Join(out, "|")
}
// OpenFile a file according to the flags and perm provided
func (vfs *VFS) OpenFile(name string, flags int, perm os.FileMode) (fd Handle, err error) {
defer fs.Trace(name, "flags=%s, perm=%v", decodeOpenFlags(flags), perm)("fd=%v, err=%v", &fd, &err)
node, err := vfs.Stat(name)
if err != nil {
if err != ENOENT || flags&os.O_CREATE == 0 {