On 2023/1/24 14:32, Christoph Hellwig wrote:
On Tue, Jan 24, 2023 at 01:38:41PM +0800, Qu Wenruo wrote:
The retry for file read is indeed triggered inside VFS, not fs/block/dm
layer itself.
Well, it's really MM code. If ->readahead fails, we eventually fall
back to a single-page ->radpage. That might still be more than one
sector in some cases, but at least nicely narrows down the range.
This also means, if some internal work (like btrfs scrub) is not
triggered by MM, then we have to do the split all by ourselves...
Thanks,
Qu
