On 1/28/21 9:12 AM, Sergei Shtepa wrote:
I`m ready to suggest the blk_interposer again.
blk_interposer allows to intercept bio requests, remap bio to
another devices or add new bios.
This version has support from device mapper.
For the dm-linear device creation command, the `noexcl` parameter
has been added, which allows to open block devices without
FMODE_EXCL mode. It allows to create dm-linear device on a block
device with an already mounted file system.
The new ioctl DM_DEV_REMAP allows to enable and disable bio
interception.
Thus, it is possible to add the dm-device to the block layer stack
without reconfiguring and rebooting.
What functionality does this driver provide that is not yet available in
a RAID level 1 (mirroring) driver + a custom dm driver? My understanding
is that there are already two RAID level 1 drivers in the kernel tree
and that both driver support sending bio's to two different block devices.
Thanks,
Bart.
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