On 2010-09-21, at 06:28, Bo Brantén wrote: > when writing new files to an ext4 file system using the Windows driver fsck will later complain "Group descriptor nn checksum is invalid" and I think that is because it used an yet unused block group without knowing that they can be marked as uninitialized. So I thought a simple patch would be to mount the file system read-only if that feature is in use untill the driver is updated with full write support but I can't find the flag to use, there is no EXT4_FEATURE_RO_COMPAT_UNINIT_BG so I thought I ask here if anyone could clear this out. The Windows driver (or any driver for that matter) should ONLY allow read-only access if ANY feature in s_feature_ro_compat is unknown, and completely refuse to mount if any feature in s_feature_incompat is unknown. The actual feature flag is called EXT4_FEATURE_RO_COMPAT_GDT_CSUM, but that doesn't matter, since what the code should be doing is masking off the features that it DOES understand and checking if any feature bits are remaining. Cheers, Andreas -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
