tree 15cff3be22c03ada0cb3e5936b73ed1451645176
parent 2db2388fcf0d880bd7160264274ed873baec4f0d
author Chao Yu <chao2.yu@samsung.com> 1444640928 +0800
committer Jaegeuk Kim <jaegeuk@kernel.org> 1444683823 -0700

f2fs: export ra_nid_pages to sysfs

After finishing building free nid cache, we will try to readahead
asynchronously 4 more pages for the next reloading, the count of
readahead nid pages is fixed.

In some case, like SMR drive, read less sectors with fixed count
each time we trigger RA may be low efficient, since we will face
high seeking overhead, so we'd better let user to configure this
parameter from sysfs in specific workload.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>