forked from Minki/linux
192 lines
5.1 KiB
C
192 lines
5.1 KiB
C
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#define pr_fmt(fmt) "drbd debugfs: " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/debugfs.h>
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#include <linux/stat.h>
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#include <linux/list.h>
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#include "drbd_int.h"
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#include "drbd_req.h"
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#include "drbd_debugfs.h"
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static struct dentry *drbd_debugfs_root;
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static struct dentry *drbd_debugfs_resources;
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static struct dentry *drbd_debugfs_minors;
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void drbd_debugfs_resource_add(struct drbd_resource *resource)
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{
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struct dentry *dentry;
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if (!drbd_debugfs_resources)
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return;
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dentry = debugfs_create_dir(resource->name, drbd_debugfs_resources);
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if (IS_ERR_OR_NULL(dentry))
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goto fail;
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resource->debugfs_res = dentry;
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dentry = debugfs_create_dir("volumes", resource->debugfs_res);
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if (IS_ERR_OR_NULL(dentry))
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goto fail;
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resource->debugfs_res_volumes = dentry;
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dentry = debugfs_create_dir("connections", resource->debugfs_res);
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if (IS_ERR_OR_NULL(dentry))
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goto fail;
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resource->debugfs_res_connections = dentry;
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return;
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fail:
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drbd_debugfs_resource_cleanup(resource);
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drbd_err(resource, "failed to create debugfs dentry\n");
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}
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static void drbd_debugfs_remove(struct dentry **dp)
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{
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debugfs_remove(*dp);
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*dp = NULL;
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}
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void drbd_debugfs_resource_cleanup(struct drbd_resource *resource)
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{
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/* it is ok to call debugfs_remove(NULL) */
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drbd_debugfs_remove(&resource->debugfs_res_in_flight_summary);
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drbd_debugfs_remove(&resource->debugfs_res_connections);
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drbd_debugfs_remove(&resource->debugfs_res_volumes);
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drbd_debugfs_remove(&resource->debugfs_res);
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}
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void drbd_debugfs_connection_add(struct drbd_connection *connection)
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{
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struct dentry *conns_dir = connection->resource->debugfs_res_connections;
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struct dentry *dentry;
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if (!conns_dir)
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return;
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/* Once we enable mutliple peers,
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* these connections will have descriptive names.
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* For now, it is just the one connection to the (only) "peer". */
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dentry = debugfs_create_dir("peer", conns_dir);
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if (IS_ERR_OR_NULL(dentry))
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goto fail;
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connection->debugfs_conn = dentry;
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return;
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fail:
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drbd_debugfs_connection_cleanup(connection);
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drbd_err(connection, "failed to create debugfs dentry\n");
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}
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void drbd_debugfs_connection_cleanup(struct drbd_connection *connection)
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{
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drbd_debugfs_remove(&connection->debugfs_conn_callback_history);
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drbd_debugfs_remove(&connection->debugfs_conn_oldest_requests);
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drbd_debugfs_remove(&connection->debugfs_conn);
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}
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void drbd_debugfs_device_add(struct drbd_device *device)
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{
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struct dentry *vols_dir = device->resource->debugfs_res_volumes;
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char minor_buf[8]; /* MINORMASK, MINORBITS == 20; */
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char vnr_buf[8]; /* volume number vnr is even 16 bit only; */
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char *slink_name = NULL;
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struct dentry *dentry;
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if (!vols_dir || !drbd_debugfs_minors)
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return;
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snprintf(vnr_buf, sizeof(vnr_buf), "%u", device->vnr);
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dentry = debugfs_create_dir(vnr_buf, vols_dir);
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if (IS_ERR_OR_NULL(dentry))
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goto fail;
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device->debugfs_vol = dentry;
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snprintf(minor_buf, sizeof(minor_buf), "%u", device->minor);
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slink_name = kasprintf(GFP_KERNEL, "../resources/%s/volumes/%u",
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device->resource->name, device->vnr);
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if (!slink_name)
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goto fail;
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dentry = debugfs_create_symlink(minor_buf, drbd_debugfs_minors, slink_name);
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if (IS_ERR_OR_NULL(dentry))
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goto fail;
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device->debugfs_minor = dentry;
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kfree(slink_name);
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fail:
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drbd_debugfs_device_cleanup(device);
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drbd_err(device, "failed to create debugfs entries\n");
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}
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void drbd_debugfs_device_cleanup(struct drbd_device *device)
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{
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drbd_debugfs_remove(&device->debugfs_minor);
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drbd_debugfs_remove(&device->debugfs_vol_oldest_requests);
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drbd_debugfs_remove(&device->debugfs_vol_act_log_extents);
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drbd_debugfs_remove(&device->debugfs_vol_resync_extents);
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drbd_debugfs_remove(&device->debugfs_vol_data_gen_id);
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drbd_debugfs_remove(&device->debugfs_vol);
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}
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void drbd_debugfs_peer_device_add(struct drbd_peer_device *peer_device)
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{
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struct dentry *conn_dir = peer_device->connection->debugfs_conn;
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struct dentry *dentry;
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char vnr_buf[8];
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if (!conn_dir)
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return;
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snprintf(vnr_buf, sizeof(vnr_buf), "%u", peer_device->device->vnr);
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dentry = debugfs_create_dir(vnr_buf, conn_dir);
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if (IS_ERR_OR_NULL(dentry))
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goto fail;
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peer_device->debugfs_peer_dev = dentry;
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return;
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fail:
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drbd_debugfs_peer_device_cleanup(peer_device);
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drbd_err(peer_device, "failed to create debugfs entries\n");
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}
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void drbd_debugfs_peer_device_cleanup(struct drbd_peer_device *peer_device)
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{
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drbd_debugfs_remove(&peer_device->debugfs_peer_dev);
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}
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/* not __exit, may be indirectly called
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* from the module-load-failure path as well. */
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void drbd_debugfs_cleanup(void)
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{
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drbd_debugfs_remove(&drbd_debugfs_resources);
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drbd_debugfs_remove(&drbd_debugfs_minors);
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drbd_debugfs_remove(&drbd_debugfs_root);
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}
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int __init drbd_debugfs_init(void)
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{
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struct dentry *dentry;
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dentry = debugfs_create_dir("drbd", NULL);
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if (IS_ERR_OR_NULL(dentry))
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goto fail;
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drbd_debugfs_root = dentry;
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dentry = debugfs_create_dir("resources", drbd_debugfs_root);
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if (IS_ERR_OR_NULL(dentry))
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goto fail;
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drbd_debugfs_resources = dentry;
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dentry = debugfs_create_dir("minors", drbd_debugfs_root);
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if (IS_ERR_OR_NULL(dentry))
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goto fail;
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drbd_debugfs_minors = dentry;
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return 0;
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fail:
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drbd_debugfs_cleanup();
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if (dentry)
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return PTR_ERR(dentry);
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else
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return -EINVAL;
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}
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