debugfs.c

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#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;

    if (fsc->mdsc == NULL || fsc->mdsc->mdsmap == NULL)
        return 0;
    seq_printf(s, "epoch %d\n", fsc->mdsc->mdsmap->m_epoch);
    seq_printf(s, "root %d\n", fsc->mdsc->mdsmap->m_root);
    seq_printf(s, "session_timeout %d\n",
               fsc->mdsc->mdsmap->m_session_timeout);
    seq_printf(s, "session_autoclose %d\n",
               fsc->mdsc->mdsmap->m_session_autoclose);
    for (i = 0; i < fsc->mdsc->mdsmap->m_max_mds; i++) {
        struct ceph_entity_addr *addr =
            &fsc->mdsc->mdsmap->m_info[i].addr;
        int state = fsc->mdsc->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 (req->r_got_unsafe)
            seq_printf(s, "\t(unsafe)");
        else
            seq_printf(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/%.*s (%s)",
                   ceph_ino(req->r_dentry->d_parent->d_inode),
                   req->r_dentry->d_name.len,
                   req->r_dentry->d_name.name,
                   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);
        }

        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/%.*s (%s)",
               ceph_ino(req->r_old_dentry_dir),
                   req->r_old_dentry->d_name.len,
                   req->r_old_dentry->d_name.name,
                   path ? path : "");
            spin_unlock(&req->r_old_dentry->d_lock);
            kfree(path);
        } else if (req->r_path2) {
            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_printf(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%.*s\n",
               di, dentry, dentry->d_name.len, dentry->d_name.name);
    }
    spin_unlock(&mdsc->dentry_lru_lock);

    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)


/*
 * 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_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->backing_dev_info.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",
                    0600,
                    fsc->client->debugfs_dir,
                    fsc,
                    &mdsmap_show_fops);
    if (!fsc->debugfs_mdsmap)
        goto out;

    fsc->debugfs_mdsc = debugfs_create_file("mdsc",
                        0600,
                        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",
                    0600,
                    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 */