v4.19.13 snapshot.
diff --git a/fs/xfs/xfs_stats.c b/fs/xfs/xfs_stats.c
new file mode 100644
index 0000000..4e44231
--- /dev/null
+++ b/fs/xfs/xfs_stats.c
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#include "xfs.h"
+#include <linux/proc_fs.h>
+
+struct xstats xfsstats;
+
+static int counter_val(struct xfsstats __percpu *stats, int idx)
+{
+ int val = 0, cpu;
+
+ for_each_possible_cpu(cpu)
+ val += *(((__u32 *)per_cpu_ptr(stats, cpu) + idx));
+ return val;
+}
+
+int xfs_stats_format(struct xfsstats __percpu *stats, char *buf)
+{
+ int i, j;
+ int len = 0;
+ uint64_t xs_xstrat_bytes = 0;
+ uint64_t xs_write_bytes = 0;
+ uint64_t xs_read_bytes = 0;
+
+ static const struct xstats_entry {
+ char *desc;
+ int endpoint;
+ } xstats[] = {
+ { "extent_alloc", XFSSTAT_END_EXTENT_ALLOC },
+ { "abt", XFSSTAT_END_ALLOC_BTREE },
+ { "blk_map", XFSSTAT_END_BLOCK_MAPPING },
+ { "bmbt", XFSSTAT_END_BLOCK_MAP_BTREE },
+ { "dir", XFSSTAT_END_DIRECTORY_OPS },
+ { "trans", XFSSTAT_END_TRANSACTIONS },
+ { "ig", XFSSTAT_END_INODE_OPS },
+ { "log", XFSSTAT_END_LOG_OPS },
+ { "push_ail", XFSSTAT_END_TAIL_PUSHING },
+ { "xstrat", XFSSTAT_END_WRITE_CONVERT },
+ { "rw", XFSSTAT_END_READ_WRITE_OPS },
+ { "attr", XFSSTAT_END_ATTRIBUTE_OPS },
+ { "icluster", XFSSTAT_END_INODE_CLUSTER },
+ { "vnodes", XFSSTAT_END_VNODE_OPS },
+ { "buf", XFSSTAT_END_BUF },
+ { "abtb2", XFSSTAT_END_ABTB_V2 },
+ { "abtc2", XFSSTAT_END_ABTC_V2 },
+ { "bmbt2", XFSSTAT_END_BMBT_V2 },
+ { "ibt2", XFSSTAT_END_IBT_V2 },
+ { "fibt2", XFSSTAT_END_FIBT_V2 },
+ { "rmapbt", XFSSTAT_END_RMAP_V2 },
+ { "refcntbt", XFSSTAT_END_REFCOUNT },
+ /* we print both series of quota information together */
+ { "qm", XFSSTAT_END_QM },
+ };
+
+ /* Loop over all stats groups */
+
+ for (i = j = 0; i < ARRAY_SIZE(xstats); i++) {
+ len += snprintf(buf + len, PATH_MAX - len, "%s",
+ xstats[i].desc);
+ /* inner loop does each group */
+ for (; j < xstats[i].endpoint; j++)
+ len += snprintf(buf + len, PATH_MAX - len, " %u",
+ counter_val(stats, j));
+ len += snprintf(buf + len, PATH_MAX - len, "\n");
+ }
+ /* extra precision counters */
+ for_each_possible_cpu(i) {
+ xs_xstrat_bytes += per_cpu_ptr(stats, i)->s.xs_xstrat_bytes;
+ xs_write_bytes += per_cpu_ptr(stats, i)->s.xs_write_bytes;
+ xs_read_bytes += per_cpu_ptr(stats, i)->s.xs_read_bytes;
+ }
+
+ len += snprintf(buf + len, PATH_MAX-len, "xpc %Lu %Lu %Lu\n",
+ xs_xstrat_bytes, xs_write_bytes, xs_read_bytes);
+ len += snprintf(buf + len, PATH_MAX-len, "debug %u\n",
+#if defined(DEBUG)
+ 1);
+#else
+ 0);
+#endif
+
+ return len;
+}
+
+void xfs_stats_clearall(struct xfsstats __percpu *stats)
+{
+ int c;
+ uint32_t vn_active;
+
+ xfs_notice(NULL, "Clearing xfsstats");
+ for_each_possible_cpu(c) {
+ preempt_disable();
+ /* save vn_active, it's a universal truth! */
+ vn_active = per_cpu_ptr(stats, c)->s.vn_active;
+ memset(per_cpu_ptr(stats, c), 0, sizeof(*stats));
+ per_cpu_ptr(stats, c)->s.vn_active = vn_active;
+ preempt_enable();
+ }
+}
+
+#ifdef CONFIG_PROC_FS
+/* legacy quota interfaces */
+#ifdef CONFIG_XFS_QUOTA
+static int xqm_proc_show(struct seq_file *m, void *v)
+{
+ /* maximum; incore; ratio free to inuse; freelist */
+ seq_printf(m, "%d\t%d\t%d\t%u\n",
+ 0, counter_val(xfsstats.xs_stats, XFSSTAT_END_XQMSTAT),
+ 0, counter_val(xfsstats.xs_stats, XFSSTAT_END_XQMSTAT + 1));
+ return 0;
+}
+
+/* legacy quota stats interface no 2 */
+static int xqmstat_proc_show(struct seq_file *m, void *v)
+{
+ int j;
+
+ seq_printf(m, "qm");
+ for (j = XFSSTAT_END_IBT_V2; j < XFSSTAT_END_XQMSTAT; j++)
+ seq_printf(m, " %u", counter_val(xfsstats.xs_stats, j));
+ seq_putc(m, '\n');
+ return 0;
+}
+#endif /* CONFIG_XFS_QUOTA */
+
+int
+xfs_init_procfs(void)
+{
+ if (!proc_mkdir("fs/xfs", NULL))
+ return -ENOMEM;
+
+ if (!proc_symlink("fs/xfs/stat", NULL,
+ "/sys/fs/xfs/stats/stats"))
+ goto out;
+
+#ifdef CONFIG_XFS_QUOTA
+ if (!proc_create_single("fs/xfs/xqmstat", 0, NULL, xqmstat_proc_show))
+ goto out;
+ if (!proc_create_single("fs/xfs/xqm", 0, NULL, xqm_proc_show))
+ goto out;
+#endif
+ return 0;
+
+out:
+ remove_proc_subtree("fs/xfs", NULL);
+ return -ENOMEM;
+}
+
+void
+xfs_cleanup_procfs(void)
+{
+ remove_proc_subtree("fs/xfs", NULL);
+}
+#endif /* CONFIG_PROC_FS */