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>

#ifdef CONFIG_DEBUG_FS

/*
 * Implement /sys/kernel/debug/ceph fun
 *
 * /sys/kernel/debug/ceph/client*  - an instance of the ceph client
 *      .../osdmap      - current osdmap
 *      .../monmap      - current monmap
 *      .../osdc        - active osd requests
 *      .../monc        - mon client state
 *      .../dentry_lru  - dump contents of dentry lru
 *      .../caps        - expose cap (reservation) stats
 *      .../bdi         - symlink to ../../bdi/something
 */

static struct dentry *ceph_debugfs_dir;

static int monmap_show(struct seq_file *s, void *p)
{
    int i;
    struct ceph_client *client = s->private;

    if (client->monc.monmap == NULL)
        return 0;

    seq_printf(s, "epoch %d\n", client->monc.monmap->epoch);
    for (i = 0; i < client->monc.monmap->num_mon; i++) {
        struct ceph_entity_inst *inst =
            &client->monc.monmap->mon_inst[i];

        seq_printf(s, "\t%s%lld\t%s\n",
               ENTITY_NAME(inst->name),
               ceph_pr_addr(&inst->addr.in_addr));
    }
    return 0;
}

static int osdmap_show(struct seq_file *s, void *p)
{
    int i;
    struct ceph_client *client = s->private;
    struct rb_node *n;

    if (client->osdc.osdmap == NULL)
        return 0;
    seq_printf(s, "epoch %d\n", client->osdc.osdmap->epoch);
    seq_printf(s, "flags%s%s\n",
           (client->osdc.osdmap->flags & CEPH_OSDMAP_NEARFULL) ?
           " NEARFULL" : "",
           (client->osdc.osdmap->flags & CEPH_OSDMAP_FULL) ?
           " FULL" : "");
    for (n = rb_first(&client->osdc.osdmap->pg_pools); n; n = rb_next(n)) {
        struct ceph_pg_pool_info *pool =
            rb_entry(n, struct ceph_pg_pool_info, node);
        seq_printf(s, "pg_pool %d pg_num %d / %d, lpg_num %d / %d\n",
               pool->id, pool->v.pg_num, pool->pg_num_mask,
               pool->v.lpg_num, pool->lpg_num_mask);
    }
    for (i = 0; i < client->osdc.osdmap->max_osd; i++) {
        struct ceph_entity_addr *addr =
            &client->osdc.osdmap->osd_addr[i];
        int state = client->osdc.osdmap->osd_state[i];
        char sb[64];

        seq_printf(s, "\tosd%d\t%s\t%3d%%\t(%s)\n",
               i, ceph_pr_addr(&addr->in_addr),
               ((client->osdc.osdmap->osd_weight[i]*100) >> 16),
               ceph_osdmap_state_str(sb, sizeof(sb), state));
    }
    return 0;
}

static int monc_show(struct seq_file *s, void *p)
{
    struct ceph_client *client = s->private;
    struct ceph_mon_generic_request *req;
    struct ceph_mon_client *monc = &client->monc;
    struct rb_node *rp;

    mutex_lock(&monc->mutex);

    if (monc->have_mdsmap)
        seq_printf(s, "have mdsmap %u\n", (unsigned int)monc->have_mdsmap);
    if (monc->have_osdmap)
        seq_printf(s, "have osdmap %u\n", (unsigned int)monc->have_osdmap);
    if (monc->want_next_osdmap)
        seq_printf(s, "want next osdmap\n");

    for (rp = rb_first(&monc->generic_request_tree); rp; rp = rb_next(rp)) {
        __u16 op;
        req = rb_entry(rp, struct ceph_mon_generic_request, node);
        op = le16_to_cpu(req->request->hdr.type);
        if (op == CEPH_MSG_STATFS)
            seq_printf(s, "%lld statfs\n", req->tid);
        else
            seq_printf(s, "%lld unknown\n", req->tid);
    }

    mutex_unlock(&monc->mutex);
    return 0;
}

static int osdc_show(struct seq_file *s, void *pp)
{
    struct ceph_client *client = s->private;
    struct ceph_osd_client *osdc = &client->osdc;
    struct rb_node *p;

    mutex_lock(&osdc->request_mutex);
    for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
        struct ceph_osd_request *req;
        struct ceph_osd_request_head *head;
        struct ceph_osd_op *op;
        int num_ops;
        int opcode, olen;
        int i;

        req = rb_entry(p, struct ceph_osd_request, r_node);

        seq_printf(s, "%lld\tosd%d\t%d.%x\t", req->r_tid,
               req->r_osd ? req->r_osd->o_osd : -1,
               le32_to_cpu(req->r_pgid.pool),
               le16_to_cpu(req->r_pgid.ps));

        head = req->r_request->front.iov_base;
        op = (void *)(head + 1);

        num_ops = le16_to_cpu(head->num_ops);
        olen = le32_to_cpu(head->object_len);
        seq_printf(s, "%.*s", olen,
               (const char *)(head->ops + num_ops));

        if (req->r_reassert_version.epoch)
            seq_printf(s, "\t%u'%llu",
               (unsigned int)le32_to_cpu(req->r_reassert_version.epoch),
               le64_to_cpu(req->r_reassert_version.version));
        else
            seq_printf(s, "\t");

        for (i = 0; i < num_ops; i++) {
            opcode = le16_to_cpu(op->op);
            seq_printf(s, "\t%s", ceph_osd_op_name(opcode));
            op++;
        }

        seq_printf(s, "\n");
    }
    mutex_unlock(&osdc->request_mutex);
    return 0;
}

CEPH_DEFINE_SHOW_FUNC(monmap_show)
CEPH_DEFINE_SHOW_FUNC(osdmap_show)
CEPH_DEFINE_SHOW_FUNC(monc_show)
CEPH_DEFINE_SHOW_FUNC(osdc_show)

int ceph_debugfs_init(void)
{
    ceph_debugfs_dir = debugfs_create_dir("ceph", NULL);
    if (!ceph_debugfs_dir)
        return -ENOMEM;
    return 0;
}

void ceph_debugfs_cleanup(void)
{
    debugfs_remove(ceph_debugfs_dir);
}

int ceph_debugfs_client_init(struct ceph_client *client)
{
    int ret = -ENOMEM;
    char name[80];

    snprintf(name, sizeof(name), "%pU.client%lld", &client->fsid,
         client->monc.auth->global_id);

    dout("ceph_debugfs_client_init %p %s\n", client, name);

    BUG_ON(client->debugfs_dir);
    client->debugfs_dir = debugfs_create_dir(name, ceph_debugfs_dir);
    if (!client->debugfs_dir)
        goto out;

    client->monc.debugfs_file = debugfs_create_file("monc",
                              0600,
                              client->debugfs_dir,
                              client,
                              &monc_show_fops);
    if (!client->monc.debugfs_file)
        goto out;

    client->osdc.debugfs_file = debugfs_create_file("osdc",
                              0600,
                              client->debugfs_dir,
                              client,
                              &osdc_show_fops);
    if (!client->osdc.debugfs_file)
        goto out;

    client->debugfs_monmap = debugfs_create_file("monmap",
                    0600,
                    client->debugfs_dir,
                    client,
                    &monmap_show_fops);
    if (!client->debugfs_monmap)
        goto out;

    client->debugfs_osdmap = debugfs_create_file("osdmap",
                    0600,
                    client->debugfs_dir,
                    client,
                    &osdmap_show_fops);
    if (!client->debugfs_osdmap)
        goto out;

    return 0;

out:
    ceph_debugfs_client_cleanup(client);
    return ret;
}

void ceph_debugfs_client_cleanup(struct ceph_client *client)
{
    dout("ceph_debugfs_client_cleanup %p\n", client);
    debugfs_remove(client->debugfs_osdmap);
    debugfs_remove(client->debugfs_monmap);
    debugfs_remove(client->osdc.debugfs_file);
    debugfs_remove(client->monc.debugfs_file);
    debugfs_remove(client->debugfs_dir);
}

#else  /* CONFIG_DEBUG_FS */

int ceph_debugfs_init(void)
{
    return 0;
}

void ceph_debugfs_cleanup(void)
{
}

int ceph_debugfs_client_init(struct ceph_client *client)
{
    return 0;
}

void ceph_debugfs_client_cleanup(struct ceph_client *client)
{
}

#endif  /* CONFIG_DEBUG_FS */

EXPORT_SYMBOL(ceph_debugfs_init);
EXPORT_SYMBOL(ceph_debugfs_cleanup);