tree bdaf82728ffc7db19e00bffe41353f53388f4c30
parent 8074bb515014d281a6f5f1218648aa3abd9c22ab
author Fan Li <fanofcode.li@samsung.com> 1456727391 +0800
committer Jaegeuk Kim <jaegeuk@kernel.org> 1458274783 -0700

f2fs: modify the readahead method in ra_node_page()

ra_node_page() is used to read ahead one node page. Comparing to regular
read, it's faster because it doesn't wait for IO completion.
But if it is called twice for reading the same block, and the IO request
from the first call hasn't been completed before the second call, the second
call will have to wait until the read is over.

Here use the code in __do_page_cache_readahead() to solve this problem.
It does nothing when someone else already puts the page in mapping. The
status of page should be assured by whoever puts it there.
This implement also prevents alteration of page reference count.

Signed-off-by: Fan li <fanofcode.li@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>