[LU-17143] Use migrate_copy_data() for all data movement

• Type: Improvement
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: Feng Lei
• Reporter: Andreas Dilger

Description

The "lfs mirror resync" code is using its own implementation of data copying instead of migrate_copy_data(), which means that bug fixes and improvements to the data copying code (eg. bandwidth limit, stats reporting, buffer sizing, DIO usage, etc.) need to be implemented in two places.

It would be better to have a single function to copy file data shared between the different operations.

Issue Links

• is related to: LU-9961 FLR2: Relocating individual objects to a new OST
• is related to: LU-16789 "lfs migrate" to use AIO/DIO or io_uring (kernel 5.1+)