Hello!
I was wondering why I can change the read-ahead size of my DVD drive via hdparm -a [size], but not by writing into /sys/block/hdb/queue/read_ahead_kb.
In other words: Why does queue_ra_store() [block/ll_rw_blk.c:3755] perform the following check
if (ra_kb > (q->max_sectors >> 1))
ra_kb = (q->max_sectors >> 1);
while blkdev_locked_ioctl() [block/ioctl.c:138] does not check this in the case that cmd == BLKRASET?
Thanks for your consideration,
- Philipp Kohlbecher
Please CC me -- I'm not on the list.
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