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syscallcompat: downgrade DT_UNKNOWN message level on XFS

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Old XFS filesystems always return DT_UNKNOWN. Downgrade the message
to "info" level if we are on XFS.

Using the "warning" level means that users on old XFS filesystems
cannot run the test suite as it intentionally aborts on any
warnings.

Fixes https://github.com/rfjakob/gocryptfs/issues/267
This commit is contained in:
Jakob Unterwurzacher 2018-11-17 17:44:21 +01:00
parent d882ed45da
commit e665df7179
1 changed files with 16 additions and 3 deletions
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19
internal/syscallcompat/getdents_linux.go
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@ -123,6 +123,21 @@ func getdentsName(s unix.Dirent) (string, error) {
var dtUnknownWarnOnce sync.Once
func dtUnknownWarn(dirfd int) {
const XFS_SUPER_MAGIC = 0x58465342 // From man 2 statfs
var buf syscall.Statfs_t
err := syscall.Fstatfs(dirfd, &buf)
if err == nil && buf.Type == XFS_SUPER_MAGIC {
// Old XFS filesystems always return DT_UNKNOWN. Downgrade the message
// to "info" level if we are on XFS.
// https://github.com/rfjakob/gocryptfs/issues/267
tlog.Info.Printf("Getdents: convertDType: received DT_UNKNOWN, fstype=xfs, falling back to stat")
} else {
tlog.Warn.Printf("Getdents: convertDType: received DT_UNKNOWN, fstype=%#x, falling back to stat",
buf.Type)
}
}
// convertDType converts a Dirent.Type to at Stat_t.Mode value.
func convertDType(dirfd int, name string, dtype uint8) (uint32, error) {
if dtype != syscall.DT_UNKNOWN {
@ -130,9 +145,7 @@ func convertDType(dirfd int, name string, dtype uint8) (uint32, error) {
return uint32(dtype) << 12, nil
}
// DT_UNKNOWN: we have to call stat()
dtUnknownWarnOnce.Do(func() {
tlog.Warn.Printf("Getdents: convertDType: received DT_UNKNOWN, falling back to stat")
})
dtUnknownWarnOnce.Do(func() { dtUnknownWarn(dirfd) })
var st unix.Stat_t
err := Fstatat(dirfd, name, &st, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {