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quota: unlink tmp file before creating it #1631

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Jun 6, 2023
Merged

quota: unlink tmp file before creating it #1631

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9 changes: 8 additions & 1 deletion drivers/quota/projectquota.go
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Original file line number Diff line number Diff line change
Expand Up @@ -428,7 +428,14 @@ func makeBackingFsDev(home string) (string, error) {
backingFsBlockDevTmp := backingFsBlockDev + ".tmp"
// Re-create just in case someone copied the home directory over to a new device
if err := unix.Mknod(backingFsBlockDevTmp, unix.S_IFBLK|0o600, int(stat.Dev)); err != nil {
return "", fmt.Errorf("failed to mknod %s: %w", backingFsBlockDevTmp, err)
if !errors.Is(err, unix.EEXIST) {
return "", fmt.Errorf("failed to mknod %s: %w", backingFsBlockDevTmp, err)
}
// On EEXIST, try again after unlinking any potential leftover.
_ = unix.Unlink(backingFsBlockDevTmp)
if err := unix.Mknod(backingFsBlockDevTmp, unix.S_IFBLK|0o600, int(stat.Dev)); err != nil {
return "", fmt.Errorf("failed to mknod %s: %w", backingFsBlockDevTmp, err)
}
}
if err := unix.Rename(backingFsBlockDevTmp, backingFsBlockDev); err != nil {
return "", fmt.Errorf("failed to rename %s to %s: %w", backingFsBlockDevTmp, backingFsBlockDev, err)
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