This is a note to let you know that I've just added the patch titled
ext4: fix lazy initialization next schedule time computation in more granular unit
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-fix-lazy-initialization-next-schedule-time-computation-in-more-granular-unit.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 39fec6889d15a658c3a3ebb06fd69d3584ddffd3 Mon Sep 17 00:00:00 2001
From: Shaoying Xu <shaoyi@xxxxxxxxxx>
Date: Thu, 2 Sep 2021 16:44:12 +0000
Subject: ext4: fix lazy initialization next schedule time computation in more granular unit
From: Shaoying Xu <shaoyi@xxxxxxxxxx>
commit 39fec6889d15a658c3a3ebb06fd69d3584ddffd3 upstream.
Ext4 file system has default lazy inode table initialization setup once
it is mounted. However, it has issue on computing the next schedule time
that makes the timeout same amount in jiffies but different real time in
secs if with various HZ values. Therefore, fix by measuring the current
time in a more granular unit nanoseconds and make the next schedule time
independent of the HZ value.
Fixes: bfff68738f1c ("ext4: add support for lazy inode table initialization")
Signed-off-by: Shaoying Xu <shaoyi@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Link: https://lore.kernel.org/r/20210902164412.9994-2-shaoyi@xxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/super.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2952,8 +2952,8 @@ static int ext4_run_li_request(struct ex
struct ext4_group_desc *gdp = NULL;
ext4_group_t group, ngroups;
struct super_block *sb;
- unsigned long timeout = 0;
int ret = 0;
+ u64 start_time;
sb = elr->lr_super;
ngroups = EXT4_SB(sb)->s_groups_count;
@@ -2973,13 +2973,12 @@ static int ext4_run_li_request(struct ex
ret = 1;
if (!ret) {
- timeout = jiffies;
+ start_time = ktime_get_real_ns();
ret = ext4_init_inode_table(sb, group,
elr->lr_timeout ? 0 : 1);
if (elr->lr_timeout == 0) {
- timeout = (jiffies - timeout) *
- elr->lr_sbi->s_li_wait_mult;
- elr->lr_timeout = timeout;
+ elr->lr_timeout = nsecs_to_jiffies((ktime_get_real_ns() - start_time) *
+ elr->lr_sbi->s_li_wait_mult);
}
elr->lr_next_sched = jiffies + elr->lr_timeout;
elr->lr_next_group = group + 1;
Patches currently in stable-queue which might be from shaoyi@xxxxxxxxxx are
queue-4.14/ext4-fix-lazy-initialization-next-schedule-time-computation-in-more-granular-unit.patch
