ext4: avoid unnecessary stalls in ext4_evict_inode()
authorJan Kara <jack@suse.cz>
Fri, 23 Jun 2017 03:49:46 +0000 (23:49 -0400)
committerTheodore Ts'o <tytso@mit.edu>
Fri, 23 Jun 2017 03:49:46 +0000 (23:49 -0400)
commit3abb1a0fc2871f2db52199e1748a1d48a54a3427
tree3c4d5c8e9120fe92c37f60449553055d8531ca6c
parentcdb7ee4c632759075866bb8da5fb16b764e66ded
ext4: avoid unnecessary stalls in ext4_evict_inode()

These days inode reclaim calls evict_inode() only when it has no pages
in the mapping.  In that case it is not necessary to wait for transaction
commit in ext4_evict_inode() as there can be no pages waiting to be
committed.  So avoid unnecessary transaction waiting in that case.

We still have to keep the check for the case where ext4_evict_inode()
gets called from other paths (e.g. umount) where inode still can have
some page cache pages.

Reported-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
fs/ext4/inode.c