-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On 01/06/2015 11:15 PM, Dave Chinner wrote: > (e.g. in ext4 inode tables because mkfs used to zero them) if they > haven't been used, so when it reads them it detects that > initialisation is needed because the blocks are empty.... No, it knows that the inode table needs initialized because there is a flag in the group descriptor that says this inode table is still uninitalized. It never reads the blocks to see if they are full of zeros. mke2fs sets the flag when it does not initialize the table with zeros, either by direct writes ( which it doesn't do if lazy_itable_init is true, which it defaults to these days ), or by discarding the blocks when the device claims to support deterministic discard that zeros. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBCgAGBQJUrgHvAAoJENRVrw2cjl5RWUUH/076fhOAYW8vRB285cz+UwrE L7o3uteYa9OctoWZTctWAVueuISJaNsxzmbu04btznETkR/YbkkexpmXRKvYt6RZ rlCzRLWLTOC4h57jZteczn9pBf0RBeeizU0pEdTdZP/IVxOqA6NDG1qywDCE9A+I 3frFg54alaZ4MCGH0jmPVbVxM6jY3/UhA8DnOoMSlIOXatV1X7UMPK3lMJ4Ih/Yx e3yDWJjNHjAn88TRAGD6WJ2066t7DBGnLOOF9PscaZNW6f4hbuvEG9teAPk51OfS cwypcLsk6Mj7WU8cSQ0T/6a7Qx84g9JC6wLR0QZCUCSau6ZfWf3ZuSI26i/Xlfc= =BRqd -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
