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xfs: allow toggling verbose logging on the health monitoring file

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Make it so that we can reconfigure the health monitoring device by
calling the XFS_IOC_HEALTH_MONITOR ioctl on it.  As of right now we can
only toggle the verbose flag, but this is less annoying than having to
closing the monitor fd and reopen it.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2026-01-20 18:06:51 -08:00
parent dfa8bad3a8
commit c0e719cb36
1 changed files with 44 additions and 0 deletions
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44
fs/xfs/xfs_healthmon.c
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@ -23,6 +23,7 @@
#include "xfs_fsops.h"
#include "xfs_notify_failure.h"
#include "xfs_file.h"
#include "xfs_ioctl.h"
#include <linux/anon_inodes.h>
#include <linux/eventpoll.h>
@ -1066,12 +1067,55 @@ xfs_healthmon_show_fdinfo(
mutex_unlock(&hm->lock);
}
/* Reconfigure the health monitor. */
STATIC long
xfs_healthmon_reconfigure(
struct file *file,
unsigned int cmd,
void __user *arg)
{
struct xfs_health_monitor hmo;
struct xfs_healthmon *hm = file->private_data;
if (copy_from_user(&hmo, arg, sizeof(hmo)))
return -EFAULT;
if (!xfs_healthmon_validate(&hmo))
return -EINVAL;
mutex_lock(&hm->lock);
hm->verbose = !!(hmo.flags & XFS_HEALTH_MONITOR_VERBOSE);
mutex_unlock(&hm->lock);
return 0;
}
/* Handle ioctls for the health monitoring thread. */
STATIC long
xfs_healthmon_ioctl(
struct file *file,
unsigned int cmd,
unsigned long p)
{
void __user *arg = (void __user *)p;
switch (cmd) {
case XFS_IOC_HEALTH_MONITOR:
return xfs_healthmon_reconfigure(file, cmd, arg);
default:
break;
}
return -ENOTTY;
}
static const struct file_operations xfs_healthmon_fops = {
.owner = THIS_MODULE,
.show_fdinfo = xfs_healthmon_show_fdinfo,
.read_iter = xfs_healthmon_read_iter,
.poll = xfs_healthmon_poll,
.release = xfs_healthmon_release,
.unlocked_ioctl = xfs_healthmon_ioctl,
};
/*