diff options
Diffstat (limited to 'drivers/block/drbd/drbd_debugfs.c')
| -rw-r--r-- | drivers/block/drbd/drbd_debugfs.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_debugfs.c b/drivers/block/drbd/drbd_debugfs.c new file mode 100644 index 000000000000..9b120c3d9703 --- /dev/null +++ b/drivers/block/drbd/drbd_debugfs.c @@ -0,0 +1,191 @@ +#define pr_fmt(fmt) "drbd debugfs: " fmt +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/debugfs.h> +#include <linux/stat.h> +#include <linux/list.h> + +#include "drbd_int.h" +#include "drbd_req.h" +#include "drbd_debugfs.h" + +static struct dentry *drbd_debugfs_root; +static struct dentry *drbd_debugfs_resources; +static struct dentry *drbd_debugfs_minors; + +void drbd_debugfs_resource_add(struct drbd_resource *resource) +{ + struct dentry *dentry; + if (!drbd_debugfs_resources) + return; + + dentry = debugfs_create_dir(resource->name, drbd_debugfs_resources); + if (IS_ERR_OR_NULL(dentry)) + goto fail; + resource->debugfs_res = dentry; + + dentry = debugfs_create_dir("volumes", resource->debugfs_res); + if (IS_ERR_OR_NULL(dentry)) + goto fail; + resource->debugfs_res_volumes = dentry; + + dentry = debugfs_create_dir("connections", resource->debugfs_res); + if (IS_ERR_OR_NULL(dentry)) + goto fail; + resource->debugfs_res_connections = dentry; + + return; + +fail: + drbd_debugfs_resource_cleanup(resource); + drbd_err(resource, "failed to create debugfs dentry\n"); +} + +static void drbd_debugfs_remove(struct dentry **dp) +{ + debugfs_remove(*dp); + *dp = NULL; +} + +void drbd_debugfs_resource_cleanup(struct drbd_resource *resource) +{ + /* it is ok to call debugfs_remove(NULL) */ + drbd_debugfs_remove(&resource->debugfs_res_in_flight_summary); + drbd_debugfs_remove(&resource->debugfs_res_connections); + drbd_debugfs_remove(&resource->debugfs_res_volumes); + drbd_debugfs_remove(&resource->debugfs_res); +} + +void drbd_debugfs_connection_add(struct drbd_connection *connection) +{ + struct dentry *conns_dir = connection->resource->debugfs_res_connections; + struct dentry *dentry; + if (!conns_dir) + return; + + /* Once we enable mutliple peers, + * these connections will have descriptive names. + * For now, it is just the one connection to the (only) "peer". */ + dentry = debugfs_create_dir("peer", conns_dir); + if (IS_ERR_OR_NULL(dentry)) + goto fail; + connection->debugfs_conn = dentry; + return; + +fail: + drbd_debugfs_connection_cleanup(connection); + drbd_err(connection, "failed to create debugfs dentry\n"); +} + +void drbd_debugfs_connection_cleanup(struct drbd_connection *connection) +{ + drbd_debugfs_remove(&connection->debugfs_conn_callback_history); + drbd_debugfs_remove(&connection->debugfs_conn_oldest_requests); + drbd_debugfs_remove(&connection->debugfs_conn); +} + +void drbd_debugfs_device_add(struct drbd_device *device) +{ + struct dentry *vols_dir = device->resource->debugfs_res_volumes; + char minor_buf[8]; /* MINORMASK, MINORBITS == 20; */ + char vnr_buf[8]; /* volume number vnr is even 16 bit only; */ + char *slink_name = NULL; + + struct dentry *dentry; + if (!vols_dir || !drbd_debugfs_minors) + return; + + snprintf(vnr_buf, sizeof(vnr_buf), "%u", device->vnr); + dentry = debugfs_create_dir(vnr_buf, vols_dir); + if (IS_ERR_OR_NULL(dentry)) + goto fail; + device->debugfs_vol = dentry; + + snprintf(minor_buf, sizeof(minor_buf), "%u", device->minor); + slink_name = kasprintf(GFP_KERNEL, "../resources/%s/volumes/%u", + device->resource->name, device->vnr); + if (!slink_name) + goto fail; + dentry = debugfs_create_symlink(minor_buf, drbd_debugfs_minors, slink_name); + if (IS_ERR_OR_NULL(dentry)) + goto fail; + device->debugfs_minor = dentry; + kfree(slink_name); + +fail: + drbd_debugfs_device_cleanup(device); + drbd_err(device, "failed to create debugfs entries\n"); +} + +void drbd_debugfs_device_cleanup(struct drbd_device *device) +{ + drbd_debugfs_remove(&device->debugfs_minor); + drbd_debugfs_remove(&device->debugfs_vol_oldest_requests); + drbd_debugfs_remove(&device->debugfs_vol_act_log_extents); + drbd_debugfs_remove(&device->debugfs_vol_resync_extents); + drbd_debugfs_remove(&device->debugfs_vol_data_gen_id); + drbd_debugfs_remove(&device->debugfs_vol); +} + +void drbd_debugfs_peer_device_add(struct drbd_peer_device *peer_device) +{ + struct dentry *conn_dir = peer_device->connection->debugfs_conn; + struct dentry *dentry; + char vnr_buf[8]; + + if (!conn_dir) + return; + + snprintf(vnr_buf, sizeof(vnr_buf), "%u", peer_device->device->vnr); + dentry = debugfs_create_dir(vnr_buf, conn_dir); + if (IS_ERR_OR_NULL(dentry)) + goto fail; + peer_device->debugfs_peer_dev = dentry; + return; + +fail: + drbd_debugfs_peer_device_cleanup(peer_device); + drbd_err(peer_device, "failed to create debugfs entries\n"); +} + +void drbd_debugfs_peer_device_cleanup(struct drbd_peer_device *peer_device) +{ + drbd_debugfs_remove(&peer_device->debugfs_peer_dev); +} + +/* not __exit, may be indirectly called + * from the module-load-failure path as well. */ +void drbd_debugfs_cleanup(void) +{ + drbd_debugfs_remove(&drbd_debugfs_resources); + drbd_debugfs_remove(&drbd_debugfs_minors); + drbd_debugfs_remove(&drbd_debugfs_root); +} + +int __init drbd_debugfs_init(void) +{ + struct dentry *dentry; + + dentry = debugfs_create_dir("drbd", NULL); + if (IS_ERR_OR_NULL(dentry)) + goto fail; + drbd_debugfs_root = dentry; + + dentry = debugfs_create_dir("resources", drbd_debugfs_root); + if (IS_ERR_OR_NULL(dentry)) + goto fail; + drbd_debugfs_resources = dentry; + + dentry = debugfs_create_dir("minors", drbd_debugfs_root); + if (IS_ERR_OR_NULL(dentry)) + goto fail; + drbd_debugfs_minors = dentry; + return 0; + +fail: + drbd_debugfs_cleanup(); + if (dentry) + return PTR_ERR(dentry); + else + return -EINVAL; +} |