The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 39fec6889d15a658c3a3ebb06fd69d3584ddffd3 Mon Sep 17 00:00:00 2001
From: Shaoying Xu shaoyi@amazon.com Date: Thu, 2 Sep 2021 16:44:12 +0000 Subject: [PATCH] ext4: fix lazy initialization next schedule time computation in more granular unit
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@amazon.com Cc: stable@vger.kernel.org Signed-off-by: Theodore Ts'o tytso@mit.edu Link: https://lore.kernel.org/r/20210902164412.9994-2-shaoyi@amazon.com Signed-off-by: Theodore Ts'o tytso@mit.edu
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 88d5d274a868..8a67e5f3f576 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3263,9 +3263,9 @@ static int ext4_run_li_request(struct ext4_li_request *elr) struct super_block *sb = elr->lr_super; ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; ext4_group_t group = elr->lr_next_group; - unsigned long timeout = 0; unsigned int prefetch_ios = 0; int ret = 0; + u64 start_time;
if (elr->lr_mode == EXT4_LI_MODE_PREFETCH_BBITMAP) { elr->lr_next_group = ext4_mb_prefetch(sb, group, @@ -3302,14 +3302,13 @@ static int ext4_run_li_request(struct ext4_li_request *elr) ret = 1;
if (!ret) { - timeout = jiffies; + start_time = ktime_get_real_ns(); ret = ext4_init_inode_table(sb, group, elr->lr_timeout ? 0 : 1); trace_ext4_lazy_itable_init(sb, group); if (elr->lr_timeout == 0) { - timeout = (jiffies - timeout) * - EXT4_SB(elr->lr_super)->s_li_wait_mult; - elr->lr_timeout = timeout; + elr->lr_timeout = nsecs_to_jiffies((ktime_get_real_ns() - start_time) * + EXT4_SB(elr->lr_super)->s_li_wait_mult); } elr->lr_next_sched = jiffies + elr->lr_timeout; elr->lr_next_group = group + 1;