v4.19.13 snapshot.
diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c
new file mode 100644
index 0000000..abdf98d
--- /dev/null
+++ b/fs/ceph/debugfs.c
@@ -0,0 +1,321 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/ceph/ceph_debug.h>
+
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#include <linux/ceph/libceph.h>
+#include <linux/ceph/mon_client.h>
+#include <linux/ceph/auth.h>
+#include <linux/ceph/debugfs.h>
+
+#include "super.h"
+
+#ifdef CONFIG_DEBUG_FS
+
+#include "mds_client.h"
+
+static int mdsmap_show(struct seq_file *s, void *p)
+{
+ int i;
+ struct ceph_fs_client *fsc = s->private;
+ struct ceph_mdsmap *mdsmap;
+
+ if (!fsc->mdsc || !fsc->mdsc->mdsmap)
+ return 0;
+ mdsmap = fsc->mdsc->mdsmap;
+ seq_printf(s, "epoch %d\n", mdsmap->m_epoch);
+ seq_printf(s, "root %d\n", mdsmap->m_root);
+ seq_printf(s, "max_mds %d\n", mdsmap->m_max_mds);
+ seq_printf(s, "session_timeout %d\n", mdsmap->m_session_timeout);
+ seq_printf(s, "session_autoclose %d\n", mdsmap->m_session_autoclose);
+ for (i = 0; i < mdsmap->m_num_mds; i++) {
+ struct ceph_entity_addr *addr = &mdsmap->m_info[i].addr;
+ int state = mdsmap->m_info[i].state;
+ seq_printf(s, "\tmds%d\t%s\t(%s)\n", i,
+ ceph_pr_addr(&addr->in_addr),
+ ceph_mds_state_name(state));
+ }
+ return 0;
+}
+
+/*
+ * mdsc debugfs
+ */
+static int mdsc_show(struct seq_file *s, void *p)
+{
+ struct ceph_fs_client *fsc = s->private;
+ struct ceph_mds_client *mdsc = fsc->mdsc;
+ struct ceph_mds_request *req;
+ struct rb_node *rp;
+ int pathlen;
+ u64 pathbase;
+ char *path;
+
+ mutex_lock(&mdsc->mutex);
+ for (rp = rb_first(&mdsc->request_tree); rp; rp = rb_next(rp)) {
+ req = rb_entry(rp, struct ceph_mds_request, r_node);
+
+ if (req->r_request && req->r_session)
+ seq_printf(s, "%lld\tmds%d\t", req->r_tid,
+ req->r_session->s_mds);
+ else if (!req->r_request)
+ seq_printf(s, "%lld\t(no request)\t", req->r_tid);
+ else
+ seq_printf(s, "%lld\t(no session)\t", req->r_tid);
+
+ seq_printf(s, "%s", ceph_mds_op_name(req->r_op));
+
+ if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
+ seq_puts(s, "\t(unsafe)");
+ else
+ seq_puts(s, "\t");
+
+ if (req->r_inode) {
+ seq_printf(s, " #%llx", ceph_ino(req->r_inode));
+ } else if (req->r_dentry) {
+ path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
+ &pathbase, 0);
+ if (IS_ERR(path))
+ path = NULL;
+ spin_lock(&req->r_dentry->d_lock);
+ seq_printf(s, " #%llx/%pd (%s)",
+ ceph_ino(d_inode(req->r_dentry->d_parent)),
+ req->r_dentry,
+ path ? path : "");
+ spin_unlock(&req->r_dentry->d_lock);
+ kfree(path);
+ } else if (req->r_path1) {
+ seq_printf(s, " #%llx/%s", req->r_ino1.ino,
+ req->r_path1);
+ } else {
+ seq_printf(s, " #%llx", req->r_ino1.ino);
+ }
+
+ if (req->r_old_dentry) {
+ path = ceph_mdsc_build_path(req->r_old_dentry, &pathlen,
+ &pathbase, 0);
+ if (IS_ERR(path))
+ path = NULL;
+ spin_lock(&req->r_old_dentry->d_lock);
+ seq_printf(s, " #%llx/%pd (%s)",
+ req->r_old_dentry_dir ?
+ ceph_ino(req->r_old_dentry_dir) : 0,
+ req->r_old_dentry,
+ path ? path : "");
+ spin_unlock(&req->r_old_dentry->d_lock);
+ kfree(path);
+ } else if (req->r_path2 && req->r_op != CEPH_MDS_OP_SYMLINK) {
+ if (req->r_ino2.ino)
+ seq_printf(s, " #%llx/%s", req->r_ino2.ino,
+ req->r_path2);
+ else
+ seq_printf(s, " %s", req->r_path2);
+ }
+
+ seq_puts(s, "\n");
+ }
+ mutex_unlock(&mdsc->mutex);
+
+ return 0;
+}
+
+static int caps_show(struct seq_file *s, void *p)
+{
+ struct ceph_fs_client *fsc = s->private;
+ int total, avail, used, reserved, min;
+
+ ceph_reservation_status(fsc, &total, &avail, &used, &reserved, &min);
+ seq_printf(s, "total\t\t%d\n"
+ "avail\t\t%d\n"
+ "used\t\t%d\n"
+ "reserved\t%d\n"
+ "min\t%d\n",
+ total, avail, used, reserved, min);
+ return 0;
+}
+
+static int dentry_lru_show(struct seq_file *s, void *ptr)
+{
+ struct ceph_fs_client *fsc = s->private;
+ struct ceph_mds_client *mdsc = fsc->mdsc;
+ struct ceph_dentry_info *di;
+
+ spin_lock(&mdsc->dentry_lru_lock);
+ list_for_each_entry(di, &mdsc->dentry_lru, lru) {
+ struct dentry *dentry = di->dentry;
+ seq_printf(s, "%p %p\t%pd\n",
+ di, dentry, dentry);
+ }
+ spin_unlock(&mdsc->dentry_lru_lock);
+
+ return 0;
+}
+
+static int mds_sessions_show(struct seq_file *s, void *ptr)
+{
+ struct ceph_fs_client *fsc = s->private;
+ struct ceph_mds_client *mdsc = fsc->mdsc;
+ struct ceph_auth_client *ac = fsc->client->monc.auth;
+ struct ceph_options *opt = fsc->client->options;
+ int mds = -1;
+
+ mutex_lock(&mdsc->mutex);
+
+ /* The 'num' portion of an 'entity name' */
+ seq_printf(s, "global_id %llu\n", ac->global_id);
+
+ /* The -o name mount argument */
+ seq_printf(s, "name \"%s\"\n", opt->name ? opt->name : "");
+
+ /* The list of MDS session rank+state */
+ for (mds = 0; mds < mdsc->max_sessions; mds++) {
+ struct ceph_mds_session *session =
+ __ceph_lookup_mds_session(mdsc, mds);
+ if (!session) {
+ continue;
+ }
+ mutex_unlock(&mdsc->mutex);
+ seq_printf(s, "mds.%d %s\n",
+ session->s_mds,
+ ceph_session_state_name(session->s_state));
+
+ ceph_put_mds_session(session);
+ mutex_lock(&mdsc->mutex);
+ }
+ mutex_unlock(&mdsc->mutex);
+
+ return 0;
+}
+
+CEPH_DEFINE_SHOW_FUNC(mdsmap_show)
+CEPH_DEFINE_SHOW_FUNC(mdsc_show)
+CEPH_DEFINE_SHOW_FUNC(caps_show)
+CEPH_DEFINE_SHOW_FUNC(dentry_lru_show)
+CEPH_DEFINE_SHOW_FUNC(mds_sessions_show)
+
+
+/*
+ * debugfs
+ */
+static int congestion_kb_set(void *data, u64 val)
+{
+ struct ceph_fs_client *fsc = (struct ceph_fs_client *)data;
+
+ fsc->mount_options->congestion_kb = (int)val;
+ return 0;
+}
+
+static int congestion_kb_get(void *data, u64 *val)
+{
+ struct ceph_fs_client *fsc = (struct ceph_fs_client *)data;
+
+ *val = (u64)fsc->mount_options->congestion_kb;
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(congestion_kb_fops, congestion_kb_get,
+ congestion_kb_set, "%llu\n");
+
+
+void ceph_fs_debugfs_cleanup(struct ceph_fs_client *fsc)
+{
+ dout("ceph_fs_debugfs_cleanup\n");
+ debugfs_remove(fsc->debugfs_bdi);
+ debugfs_remove(fsc->debugfs_congestion_kb);
+ debugfs_remove(fsc->debugfs_mdsmap);
+ debugfs_remove(fsc->debugfs_mds_sessions);
+ debugfs_remove(fsc->debugfs_caps);
+ debugfs_remove(fsc->debugfs_mdsc);
+ debugfs_remove(fsc->debugfs_dentry_lru);
+}
+
+int ceph_fs_debugfs_init(struct ceph_fs_client *fsc)
+{
+ char name[100];
+ int err = -ENOMEM;
+
+ dout("ceph_fs_debugfs_init\n");
+ BUG_ON(!fsc->client->debugfs_dir);
+ fsc->debugfs_congestion_kb =
+ debugfs_create_file("writeback_congestion_kb",
+ 0600,
+ fsc->client->debugfs_dir,
+ fsc,
+ &congestion_kb_fops);
+ if (!fsc->debugfs_congestion_kb)
+ goto out;
+
+ snprintf(name, sizeof(name), "../../bdi/%s",
+ dev_name(fsc->sb->s_bdi->dev));
+ fsc->debugfs_bdi =
+ debugfs_create_symlink("bdi",
+ fsc->client->debugfs_dir,
+ name);
+ if (!fsc->debugfs_bdi)
+ goto out;
+
+ fsc->debugfs_mdsmap = debugfs_create_file("mdsmap",
+ 0400,
+ fsc->client->debugfs_dir,
+ fsc,
+ &mdsmap_show_fops);
+ if (!fsc->debugfs_mdsmap)
+ goto out;
+
+ fsc->debugfs_mds_sessions = debugfs_create_file("mds_sessions",
+ 0400,
+ fsc->client->debugfs_dir,
+ fsc,
+ &mds_sessions_show_fops);
+ if (!fsc->debugfs_mds_sessions)
+ goto out;
+
+ fsc->debugfs_mdsc = debugfs_create_file("mdsc",
+ 0400,
+ fsc->client->debugfs_dir,
+ fsc,
+ &mdsc_show_fops);
+ if (!fsc->debugfs_mdsc)
+ goto out;
+
+ fsc->debugfs_caps = debugfs_create_file("caps",
+ 0400,
+ fsc->client->debugfs_dir,
+ fsc,
+ &caps_show_fops);
+ if (!fsc->debugfs_caps)
+ goto out;
+
+ fsc->debugfs_dentry_lru = debugfs_create_file("dentry_lru",
+ 0400,
+ fsc->client->debugfs_dir,
+ fsc,
+ &dentry_lru_show_fops);
+ if (!fsc->debugfs_dentry_lru)
+ goto out;
+
+ return 0;
+
+out:
+ ceph_fs_debugfs_cleanup(fsc);
+ return err;
+}
+
+
+#else /* CONFIG_DEBUG_FS */
+
+int ceph_fs_debugfs_init(struct ceph_fs_client *fsc)
+{
+ return 0;
+}
+
+void ceph_fs_debugfs_cleanup(struct ceph_fs_client *fsc)
+{
+}
+
+#endif /* CONFIG_DEBUG_FS */