From: Ira Weiny <ira.weiny@xxxxxxxxx>
kmap is inefficient and can be abused so it is being phased out in favor of
kmap_local_page where possible.
ext2 uses kmap in ext2_[get|put]_page(). All of the calls to
ext2_[get|put]_page() occur in single threads so it is perfectly safe and
preferable to use kmap_local_page().
This series has a clean up which matches ext2_put_page() with ext2_dotdot() and
ext2_find_entry(). Those calls use ext2_get_page() to map the page prior to
returning it to their callers. And they document that ext2_put_page() should
be matched up with them. This was the case but the ext2_put_page() calls were
hidden in other functions. We lift the ext2_put_page() calls to match up to
the functions where ext2_dotdot() and ext2_find_entry() are called.
After that clean up convert ext2_[get|put]_page() to kmap and adjust for
kunmap_local() requiring the page address.
Nesting of kmap_local_page() calls is maintained with minor changes.
Ira Weiny (2):
ext2: Match up ext2_put_page() with ext2_dotdot() and
ext2_find_entry()
fs/ext2: Replace kmap() with kmap_local_page()
fs/ext2/dir.c | 94 +++++++++++++++++++++++++++++++------------------
fs/ext2/ext2.h | 12 ++++---
fs/ext2/namei.c | 34 +++++++++++-------
3 files changed, 89 insertions(+), 51 deletions(-)
--
2.28.0.rc0.12.gb6a658bd00c9
