[14/16] xfs: allow reconfiguration of the health monitoring device

Commit Message

Darrick J. Wong Dec. 31, 2024, 11:42 p.m. UTC

From: Darrick J. Wong <[e-mail]>

Make it so that we can reconfigure the health monitoring device by
calling the XFS_IOC_HEALTH_MONITOR ioctl on it.

Signed-off-by: "Darrick J. Wong" <[e-mail]>
---
 fs/xfs/xfs_healthmon.c |   29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

Patch

diff --git a/fs/xfs/xfs_healthmon.c b/fs/xfs/xfs_healthmon.c
index 9320f12b60ade9..67f7d4a8cc7f58 100644
--- a/fs/xfs/xfs_healthmon.c
+++ b/fs/xfs/xfs_healthmon.c
@@ -23,6 +23,8 @@ 
 #include "xfs_fsops.h"
 #include "xfs_notify_failure.h"
 #include "xfs_file.h"
+#include "xfs_fs.h"
+#include "xfs_ioctl.h"
 
 #include <linux/anon_inodes.h>
 #include <linux/eventpoll.h>
@@ -1228,11 +1230,38 @@  xfs_healthmon_validate(
 	return true;
 }
 
+/* Handle ioctls for the health monitoring thread. */
+STATIC long
+xfs_healthmon_ioctl(
+	struct file			*file,
+	unsigned int			cmd,
+	unsigned long			p)
+{
+	struct xfs_health_monitor	hmo;
+	struct xfs_healthmon		*hm = file->private_data;
+	void __user			*arg = (void __user *)p;
+
+	if (cmd != XFS_IOC_HEALTH_MONITOR)
+		return -ENOTTY;
+
+	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;
+}
+
 static const struct file_operations xfs_healthmon_fops = {
 	.owner		= THIS_MODULE,
 	.read_iter	= xfs_healthmon_read_iter,
 	.poll		= xfs_healthmon_poll,
 	.release	= xfs_healthmon_release,
+	.unlocked_ioctl	= xfs_healthmon_ioctl,
 };
 
 /*