add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/xfs/xfs_sysfs.c
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@@ -10,9 +10,7 @@
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 #include "xfs_log_format.h"
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 #include "xfs_trans_resv.h"
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 #include "xfs_sysfs.h"
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-#include "xfs_log.h"
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 #include "xfs_log_priv.h"
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-#include "xfs_stats.h"
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 #include "xfs_mount.h"
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15
 
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 struct xfs_sysfs_attr {
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@@ -64,19 +62,6 @@
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 	.show = xfs_sysfs_object_show,
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 	.store = xfs_sysfs_object_store,
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 };
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-
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-/*
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- * xfs_mount kobject. The mp kobject also serves as the per-mount parent object
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- * that is identified by the fsname under sysfs.
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- */
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-
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-static inline struct xfs_mount *
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-to_mp(struct kobject *kobject)
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-{
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-	struct xfs_kobj *kobj = to_kobj(kobject);
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-
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-	return container_of(kobj, struct xfs_mount, m_kobj);
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-}
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 static struct attribute *xfs_mp_attrs[] = {
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 	NULL,
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@@ -183,10 +168,74 @@
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 }
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 XFS_SYSFS_ATTR_RW(mount_delay);
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+static ssize_t
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+always_cow_store(
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+	struct kobject	*kobject,
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+	const char	*buf,
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+	size_t		count)
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+{
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+	ssize_t		ret;
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+
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+	ret = kstrtobool(buf, &xfs_globals.always_cow);
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+	if (ret < 0)
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+		return ret;
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+	return count;
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+}
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+
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+static ssize_t
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+always_cow_show(
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+	struct kobject	*kobject,
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+	char		*buf)
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+{
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+	return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.always_cow);
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+}
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+XFS_SYSFS_ATTR_RW(always_cow);
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+
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+#ifdef DEBUG
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+/*
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+ * Override how many threads the parallel work queue is allowed to create.
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+ * This has to be a debug-only global (instead of an errortag) because one of
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+ * the main users of parallel workqueues is mount time quotacheck.
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+ */
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+STATIC ssize_t
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+pwork_threads_store(
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+	struct kobject	*kobject,
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+	const char	*buf,
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+	size_t		count)
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+{
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+	int		ret;
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+	int		val;
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+
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+	ret = kstrtoint(buf, 0, &val);
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+	if (ret)
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+		return ret;
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+
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+	if (val < -1 || val > num_possible_cpus())
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+		return -EINVAL;
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+
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+	xfs_globals.pwork_threads = val;
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+
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+	return count;
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+}
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+
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+STATIC ssize_t
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+pwork_threads_show(
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+	struct kobject	*kobject,
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+	char		*buf)
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+{
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+	return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.pwork_threads);
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+}
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+XFS_SYSFS_ATTR_RW(pwork_threads);
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+#endif /* DEBUG */
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+
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 static struct attribute *xfs_dbg_attrs[] = {
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 	ATTR_LIST(bug_on_assert),
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 	ATTR_LIST(log_recovery_delay),
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 	ATTR_LIST(mount_delay),
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+	ATTR_LIST(always_cow),
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+#ifdef DEBUG
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+	ATTR_LIST(pwork_threads),
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+#endif
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 	NULL,
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 };
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