Since it is possible for the same block device to be mounted multiple times concurrently by the same filesystem, and since ext3 explicitly disables the BKL during its fill_super operation which would prevent this, what is the result of mounting it multiple times this way? Especially if the filesystem is dirty and a journal is replayed. (In any case, what operation is being performed by ext3/ext4 that requires the BKL to be dropped? What's the need to even consider the BKL during fill_super?) And in general, how does a filesystem deal with being mounted multiple times in this way? In my testing and exploration so far, everything seems to generally work, but I haven't tried deliberately using different instances of the mount concurrently. Do we end up with locks not being held properly on the superblock because the super_block structure instances don't know about each other? Has dealing with this behavior of bd_claim really been considered before, and if so, what's the general scheme for handling it? -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
