Dear Pavel Herrmann,
On Friday 21 of September 2012 14:39:14 Marek Vasut wrote:
Dear Pavel Herrmann,
On Thursday 20 of September 2012 21:58:17 Marek Vasut wrote:
Dear Pavel Herrmann,
This core will register all block devices (disk, cards, partitons) and provide unfied access to them, instead of current method with device + partition offset
Signed-off-by: Pavel Herrmann morpheus.ibis@gmail.com
Makefile | 1 + drivers/blockdev/Makefile | 42 ++++++++++++++++ include/dm/blockdev.h | 121
++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 164 insertions(+)
create mode 100644 drivers/blockdev/Makefile create mode 100644 include/dm/blockdev.h
Why not use drivers/block/ ?
Because the drivers in drivers/block have a different purpose than blockdev.
Different, ok. Can you elaborate how is it different?
blockctrl is equivalent in purpose to drivers/block, just a new approach
blockctrl = AHCI, PIIX... whichever chip you have between SATA and PCI (or generally disk-bus and board-bus)
So this is for sata ? Or will it also by used for SD/USB flash discs?
blockdev = disk, partition, SD card
Uh, let's say I understand (even if I don't see the correlation between partition and SD card)
- something that does basic checks
(range, possibility of operation) and submits operations to correct parent (blockctrl, MMC controller, whatnot).
Ascii art might help here greatly (how these pieces fall together). I think I do understand it though.
Also this gets rid of all partition-related code in filesystems, because the access to a partition and to the whole disk is the same, no need to manually compute offsets every time (and you can support discontinuous partitions, if you chose to do so)
Pavel Herrmann
Best regards, Marek Vasut