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ext4: make directory inode spreading reflect flexbg size 

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>
This commit is contained in:
Jan Kara 2022-09-08 11:21:26 +02:00 committed by Theodore Ts'o
parent 1940265ede
commit 613c5a8589
1 changed files with 1 additions and 1 deletions
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2
fs/ext4/ialloc.c
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@ -510,7 +510,7 @@ 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;