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    Subject[PATCH 5.19 204/207] ext4: make directory inode spreading reflect flexbg size
    Date
    From: Jan Kara <jack@suse.cz>

    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>
    ---
    fs/ext4/ialloc.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/fs/ext4/ialloc.c
    +++ b/fs/ext4/ialloc.c
    @@ -510,7 +510,7 @@ static int find_group_orlov(struct super
    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;

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