Readahead pages

Readahead pages

[Marco Stornelli]

Hi,

testing my fs (pramfs), I can see that VFS calls my read_page function
for a single read on a file. I'm using the do_sync_read path and
direct IO to read/write on a file. The read page is called from
readahead path (from page_cache_sync_readahead), but in the backing
dev info, the ra pages is zero, so how is it possible? Is the fs in
charge of doing some call to avoid readahead or is not possible avoid
it?

Thanks.

Marco