https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221973
Bug ID: 221973
Summary: cam iosched: BIO_ZONE commands probably shouldn't use
the read queue
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Keywords: patch
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Flags: mfc-stable11?
Created attachment 185970
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=185970&action=edit
cam iosched: Use the write queue for BIO_ZONE commands
The attached patch lets iosched put BIO_ZONE commands on the write queue
so they can't get executed ahead of writes that were sent after them.
I'm not completely sure but believe that this is less likely to cause problems
than putting them one the read queue.
As I currently don't use SMR drives the patch hasn't been properly tested.
It prevents the kernel message:
kernel: Found bio_cmd = 0x9
which cam_iosched_next_bio() emits when finding commands
other than BIO_READ in the read queue, though.
The fact that BIO_ZONE commands are sometimes sent to non-SMR
drives may indicate another problem but I haven't looked into this
yet.
Obtained from: ElectroBSD
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