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Add orphan_scan_delay_ms mount option

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Add a mount option to set the delay betwen scanning of the orphan list.
The sysfs file for the option is writable so this option can be set at
run time.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2022-03-10 11:43:11 -08:00
parent f3b7c683f0
commit a67ea30bb7
5 changed files with 114 additions and 21 deletions
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kmod/src/inode.c
+17 -11
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@@ -1745,18 +1745,26 @@ void scoutfs_inode_queue_iput(struct inode *inode)
/*
* All mounts are performing this work concurrently. We introduce
* significant jitter between them to try and keep them from all
* bunching up and working on the same inodes.
* bunching up and working on the same inodes. We always try to delay
* for at least one jiffy if precision tricks us into calculating no
* delay.
*/
static void schedule_orphan_dwork(struct inode_sb_info *inf)
void scoutfs_inode_schedule_orphan_dwork(struct super_block *sb)
{
#define ORPHAN_SCAN_MIN_MS (10 * MSEC_PER_SEC)
#define ORPHAN_SCAN_JITTER_MS (40 * MSEC_PER_SEC)
DECLARE_INODE_SB_INFO(sb, inf);
struct scoutfs_mount_options opts;
unsigned long low;
unsigned long high;
unsigned long delay;
if (!inf->stopped) {
delay = msecs_to_jiffies(ORPHAN_SCAN_MIN_MS +
prandom_u32_max(ORPHAN_SCAN_JITTER_MS));
schedule_delayed_work(&inf->orphan_scan_dwork, delay);
scoutfs_options_read(sb, &opts);
low = (opts.orphan_scan_delay_ms * 80) / 100;
high = (opts.orphan_scan_delay_ms * 120) / 100;
delay = msecs_to_jiffies(low + prandom_u32_max(high - low)) ?: 1;
mod_delayed_work(system_wq, &inf->orphan_scan_dwork, delay);
}
}
@@ -1885,7 +1893,7 @@ out:
if (ret < 0)
scoutfs_inc_counter(sb, orphan_scan_error);
schedule_orphan_dwork(inf);
scoutfs_inode_schedule_orphan_dwork(sb);
}
/*
@@ -2010,9 +2018,7 @@ int scoutfs_inode_setup(struct super_block *sb)
*/
void scoutfs_inode_start(struct super_block *sb)
{
DECLARE_INODE_SB_INFO(sb, inf);
schedule_orphan_dwork(inf);
scoutfs_inode_schedule_orphan_dwork(sb);
}
/*