ext4: make directory inode spreading reflect flexbg size

commit 613c5a85898d1cd44e68f28d65eccf64a8ace9cf upstream.

Currently the Orlov inode allocator searches for free inodes for a
directory only in flex block groups with at most inodes_per_group/16
more directory inodes than average per flex block group. However with
growing size of flex block group this becomes unnecessarily strict.
Scale allowed difference from average directory count per flex block
group with flex block group size as we do with other metrics.

Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Tested-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Cc: stable@kernel.org
Link: https://lore.kernel.org/all/0d81a7c2-46b7-6010-62a4-3e6cfc1628d6@i2se.com/
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220908092136.11770-3-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index e6520627a84a4cc414e9fb0b1bd0f2305b269746..e45398c323ee759fa10a9e9a10c77b6b9b298e0d 100644 (file)
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -513,7 +513,7 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
                goto fallback;
        }
 
-       max_dirs = ndirs / ngroups + inodes_per_group / 16;
+       max_dirs = ndirs / ngroups + inodes_per_group*flex_size / 16;
        min_inodes = avefreei - inodes_per_group*flex_size / 4;
        if (min_inodes < 1)
                min_inodes = 1;