This repository is a fork of the upstreamed bcache module with some added functionalities.
Introducing a bcache control device (/dev/bcache_ctrl) that allows communicating to the driver from user space via IOCTL. The only IOCTL commands currently implemented, receives a struct cache_sb and uses it to register the backing device.
Registering a backing device via the new provided IOCTL interface will prevent the device from the need of being formatted.
Tested and compatible with Linux kernel:
- v5.13
- v5.11
- v5.4*
*: need this patch to be applied
--- /lib/modules/5.4.0-107-generic/build/include/trace/events/bcache.h.orig 2022-04-07 11:41:33.718904155 +0000
+++ /lib/modules/5.4.0-107-generic/build/include/trace/events/bcache.h 2022-04-07 11:41:58.814969279 +0000
@@ -164,7 +164,7 @@
),
TP_fast_assign(
- memcpy(__entry->uuid, c->sb.set_uuid, 16);
+ memcpy(__entry->uuid, c->set_uuid, 16);
__entry->inode = inode;
__entry->sector = bio->bi_iter.bi_sector;
__entry->nr_sector = bio->bi_iter.bi_size >> 9;
@@ -200,7 +200,7 @@
),
TP_fast_assign(
- memcpy(__entry->uuid, c->sb.set_uuid, 16);
+ memcpy(__entry->uuid, c->set_uuid, 16);
),
TP_printk("%pU", __entry->uuid)
Clone this GitHub repository:
git clone https://github.com/andreatomassetti/bcache.git
make
sudo make install
sudo modprobe bcache.ko
You can use an extended version of the make-bcache tool available here: https://github.com/andreatomassetti/bcache-tools
git clone https://github.com/andreatomassetti/bcache-tools.git -b ioctl_mod
make
make install
make-bcache --ioctl -B /dev/sdb