Cc: Martin K. Petersen <martin.petersen@...>, James Bottomley <James.Bottomley@...>, Matthew Wilcox <matthew@...>, Ric Wheeler <rwheeler@...>, <linux-scsi@...>, <linux-ide@...>, <linux-kernel@...>, Jeff Garzik <jeff@...>
...
Do they expose that sector size?
I.e., does ioctl(fd,BLKSSZGET,&ss) set ss to 4096?
I'm interested because I'm preparing GNU Parted's partition table
manipulation code (not its FS code) for just that.
In particular, now I've heard two stories:
- disk makers will eventually sell drives with >512-byte sectors
- some disk makers have sort of agreed not to do that, and
expect forever to hide the larger underlying sector size
behind a virtual 512 (of course, this imposes alignment
restrictions, but that's a smaller problem)
Even if the latter is the case, we still have to deal with
optical and flash, both of which can already have larger sectors.
Speaking of O_DIRECT, both dd and shred (both in coreutils), use
O_DIRECT, so you could get _some_ coverage just by running shred
and experimenting with dd's oflag=direct and iflag=direct options.
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