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    Subject[PATCH 23/24] ceph: debugfs
    Date
    Basic state information is available via /sys/kernel/debug/ceph,
    including instances of the client, current monitor, mds and osd
    maps, and outstanding service requests.

    Signed-off-by: Sage Weil <sage@newdream.net>
    ---
    fs/ceph/debugfs.c | 450 +++++++++++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 450 insertions(+), 0 deletions(-)
    create mode 100644 fs/ceph/debugfs.c

    diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c
    new file mode 100644
    index 0000000..b90fc3e
    --- /dev/null
    +++ b/fs/ceph/debugfs.c
    @@ -0,0 +1,450 @@
    +#include "ceph_debug.h"
    +
    +#include <linux/module.h>
    +#include <linux/ctype.h>
    +#include <linux/debugfs.h>
    +#include <linux/seq_file.h>
    +
    +#include "super.h"
    +#include "mds_client.h"
    +#include "mon_client.h"
    +#include "auth.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
    + * .../mdsmap - current mdsmap
    + * .../monmap - current monmap
    + * .../osdc - active osd requests
    + * .../mdsc - active mds requests
    + * .../monc - mon client state
    + * .../dentry_lru - dump contents of dentry lru
    + * .../caps - expose cap (reservation) stats
    + */
    +
    +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),
    + pr_addr(&inst->addr.in_addr));
    + }
    + return 0;
    +}
    +
    +static int mdsmap_show(struct seq_file *s, void *p)
    +{
    + int i;
    + struct ceph_client *client = s->private;
    +
    + if (client->mdsc.mdsmap == NULL)
    + return 0;
    + seq_printf(s, "epoch %d\n", client->mdsc.mdsmap->m_epoch);
    + seq_printf(s, "root %d\n", client->mdsc.mdsmap->m_root);
    + seq_printf(s, "session_timeout %d\n",
    + client->mdsc.mdsmap->m_session_timeout);
    + seq_printf(s, "session_autoclose %d\n",
    + client->mdsc.mdsmap->m_session_autoclose);
    + for (i = 0; i < client->mdsc.mdsmap->m_max_mds; i++) {
    + struct ceph_entity_addr *addr =
    + &client->mdsc.mdsmap->m_info[i].addr;
    + int state = client->mdsc.mdsmap->m_info[i].state;
    +
    + seq_printf(s, "\tmds%d\t%s\t(%s)\n", i, pr_addr(&addr->in_addr),
    + ceph_mds_state_name(state));
    + }
    + return 0;
    +}
    +
    +static int osdmap_show(struct seq_file *s, void *p)
    +{
    + int i;
    + struct ceph_client *client = s->private;
    +
    + 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 (i = 0; i < client->osdc.osdmap->num_pools; i++) {
    + struct ceph_pg_pool_info *pool =
    + &client->osdc.osdmap->pg_pool[i];
    + seq_printf(s, "pg_pool %d pg_num %d / %d, lpg_num %d / %d\n",
    + i, 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, 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_statfs_request *req;
    + u64 nexttid = 0;
    + int got;
    + struct ceph_mon_client *monc = &client->monc;
    +
    + mutex_lock(&monc->mutex);
    +
    + if (monc->have_mdsmap)
    + seq_printf(s, "have mdsmap %u\n", (unsigned)monc->have_mdsmap);
    + if (monc->have_osdmap)
    + seq_printf(s, "have osdmap %u\n", (unsigned)monc->have_osdmap);
    + if (monc->want_next_osdmap)
    + seq_printf(s, "want next osdmap\n");
    +
    + while (nexttid < monc->last_tid) {
    + got = radix_tree_gang_lookup(&monc->statfs_request_tree,
    + (void **)&req, nexttid, 1);
    + if (got == 0)
    + break;
    + nexttid = req->tid + 1;
    +
    + seq_printf(s, "%lld statfs\n", req->tid);
    + }
    + mutex_unlock(&monc->mutex);
    +
    + return 0;
    +}
    +
    +static int mdsc_show(struct seq_file *s, void *p)
    +{
    + struct ceph_client *client = s->private;
    + struct ceph_mds_request *req;
    + u64 nexttid = 0;
    + int got;
    + struct ceph_mds_client *mdsc = &client->mdsc;
    + int pathlen;
    + u64 pathbase;
    + char *path;
    +
    + mutex_lock(&mdsc->mutex);
    + while (nexttid < mdsc->last_tid) {
    + got = radix_tree_gang_lookup(&mdsc->request_tree,
    + (void **)&req, nexttid, 1);
    + if (got == 0)
    + break;
    + nexttid = req->r_tid + 1;
    +
    + if (req->r_request)
    + seq_printf(s, "%lld\tmds%d\t", req->r_tid, req->r_mds);
    + else
    + seq_printf(s, "%lld\t(no request)\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);
    + 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);
    + spin_lock(&req->r_old_dentry->d_lock);
    + seq_printf(s, " #%llx/%.*s (%s)",
    + ceph_ino(req->r_old_dentry->d_parent->d_inode),
    + 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 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", req->r_tid,
    + req->r_osd ? req->r_osd->o_osd : -1);
    +
    + 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)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;
    +}
    +
    +static int caps_show(struct seq_file *s, void *p)
    +{
    + struct ceph_client *client = p;
    + int total, avail, used, reserved;
    +
    + ceph_reservation_status(client, &total, &avail, &used, &reserved);
    + seq_printf(s, "total\t\t%d\n"
    + "avail\t\t%d\n"
    + "used\t\t%d\n"
    + "reserved\t%d\n",
    + total, avail, used, reserved);
    + return 0;
    +}
    +
    +static int dentry_lru_show(struct seq_file *s, void *ptr)
    +{
    + struct ceph_client *client = s->private;
    + struct ceph_mds_client *mdsc = &client->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;
    +}
    +
    +#define DEFINE_SHOW_FUNC(name) \
    +static int name##_open(struct inode *inode, struct file *file) \
    +{ \
    + struct seq_file *sf; \
    + int ret; \
    + \
    + ret = single_open(file, name, NULL); \
    + sf = file->private_data; \
    + sf->private = inode->i_private; \
    + return ret; \
    +} \
    + \
    +static const struct file_operations name##_fops = { \
    + .open = name##_open, \
    + .read = seq_read, \
    + .llseek = seq_lseek, \
    + .release = single_release, \
    +};
    +
    +DEFINE_SHOW_FUNC(monmap_show)
    +DEFINE_SHOW_FUNC(mdsmap_show)
    +DEFINE_SHOW_FUNC(osdmap_show)
    +DEFINE_SHOW_FUNC(monc_show)
    +DEFINE_SHOW_FUNC(mdsc_show)
    +DEFINE_SHOW_FUNC(osdc_show)
    +DEFINE_SHOW_FUNC(dentry_lru_show)
    +DEFINE_SHOW_FUNC(caps_show)
    +
    +int __init 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 = 0;
    + char name[80];
    +
    + snprintf(name, sizeof(name), FSID_FORMAT ".client%lld",
    + PR_FSID(&client->fsid), client->monc.auth->global_id);
    +
    + 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->mdsc.debugfs_file = debugfs_create_file("mdsc",
    + 0600,
    + client->debugfs_dir,
    + client,
    + &mdsc_show_fops);
    + if (!client->mdsc.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_mdsmap = debugfs_create_file("mdsmap",
    + 0600,
    + client->debugfs_dir,
    + client,
    + &mdsmap_show_fops);
    + if (!client->debugfs_mdsmap)
    + goto out;
    +
    + client->debugfs_osdmap = debugfs_create_file("osdmap",
    + 0600,
    + client->debugfs_dir,
    + client,
    + &osdmap_show_fops);
    + if (!client->debugfs_osdmap)
    + goto out;
    +
    + client->debugfs_dentry_lru = debugfs_create_file("dentry_lru",
    + 0600,
    + client->debugfs_dir,
    + client,
    + &dentry_lru_show_fops);
    + if (!client->debugfs_dentry_lru)
    + goto out;
    +
    + client->debugfs_caps = debugfs_create_file("caps",
    + 0400,
    + client->debugfs_dir,
    + client,
    + &caps_show_fops);
    + if (!client->debugfs_caps)
    + goto out;
    +
    + return 0;
    +
    +out:
    + ceph_debugfs_client_cleanup(client);
    + return ret;
    +}
    +
    +void ceph_debugfs_client_cleanup(struct ceph_client *client)
    +{
    + debugfs_remove(client->debugfs_caps);
    + debugfs_remove(client->debugfs_dentry_lru);
    + debugfs_remove(client->debugfs_osdmap);
    + debugfs_remove(client->debugfs_mdsmap);
    + debugfs_remove(client->debugfs_monmap);
    + debugfs_remove(client->osdc.debugfs_file);
    + debugfs_remove(client->mdsc.debugfs_file);
    + debugfs_remove(client->monc.debugfs_file);
    + debugfs_remove(client->debugfs_dir);
    +}
    +
    +#else // CONFIG_DEBUG_FS
    +
    +int __init 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
    --
    1.6.5


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