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block: drbd: no need to check return value of debugfs_create functions

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When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: Philipp Reisner <philipp.reisner@linbit.com>
Cc: Lars Ellenberg <lars.ellenberg@linbit.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: drbd-dev@lists.linbit.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Greg Kroah-Hartman 2019-06-18 17:45:49 +02:00 committed by Jens Axboe
parent 3a211b7152
commit d27e84a305
3 changed files with 5 additions and 66 deletions
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64
drivers/block/drbd/drbd_debugfs.c
View File

@ -465,35 +465,20 @@ static const struct file_operations in_flight_summary_fops = {
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;
dentry = debugfs_create_file("in_flight_summary", 0440,
resource->debugfs_res, resource,
&in_flight_summary_fops);
if (IS_ERR_OR_NULL(dentry))
goto fail;
resource->debugfs_res_in_flight_summary = 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)
@ -636,35 +621,22 @@ 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;
dentry = debugfs_create_file("callback_history", 0440,
connection->debugfs_conn, connection,
&connection_callback_history_fops);
if (IS_ERR_OR_NULL(dentry))
goto fail;
connection->debugfs_conn_callback_history = dentry;
dentry = debugfs_create_file("oldest_requests", 0440,
connection->debugfs_conn, connection,
&connection_oldest_requests_fops);
if (IS_ERR_OR_NULL(dentry))
goto fail;
connection->debugfs_conn_oldest_requests = 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)
@ -809,8 +781,6 @@ void drbd_debugfs_device_add(struct drbd_device *device)
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);
@ -819,18 +789,14 @@ void drbd_debugfs_device_add(struct drbd_device *device)
if (!slink_name)
goto fail;
dentry = debugfs_create_symlink(minor_buf, drbd_debugfs_minors, slink_name);
device->debugfs_minor = dentry;
kfree(slink_name);
slink_name = NULL;
if (IS_ERR_OR_NULL(dentry))
goto fail;
device->debugfs_minor = dentry;
#define DCF(name) do { \
dentry = debugfs_create_file(#name, 0440, \
device->debugfs_vol, device, \
&device_ ## name ## _fops); \
if (IS_ERR_OR_NULL(dentry)) \
goto fail; \
device->debugfs_vol_ ## name = dentry; \
} while (0)
@ -864,19 +830,9 @@ void drbd_debugfs_peer_device_add(struct drbd_peer_device *peer_device)
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)
@ -917,35 +873,19 @@ void drbd_debugfs_cleanup(void)
drbd_debugfs_remove(&drbd_debugfs_root);
}
int __init drbd_debugfs_init(void)
void __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_file("version", 0444, drbd_debugfs_root, NULL, &drbd_version_fops);
if (IS_ERR_OR_NULL(dentry))
goto fail;
drbd_debugfs_version = 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;
}

4
drivers/block/drbd/drbd_debugfs.h
View File

@ -6,7 +6,7 @@
#include "drbd_int.h"
#ifdef CONFIG_DEBUG_FS
int __init drbd_debugfs_init(void);
void __init drbd_debugfs_init(void);
void drbd_debugfs_cleanup(void);
void drbd_debugfs_resource_add(struct drbd_resource *resource);
@ -22,7 +22,7 @@ void drbd_debugfs_peer_device_add(struct drbd_peer_device *peer_device);
void drbd_debugfs_peer_device_cleanup(struct drbd_peer_device *peer_device);
#else
static inline int __init drbd_debugfs_init(void) { return -ENODEV; }
static inline void __init drbd_debugfs_init(void) { }
static inline void drbd_debugfs_cleanup(void) { }
static inline void drbd_debugfs_resource_add(struct drbd_resource *resource) { }

3
drivers/block/drbd/drbd_main.c
View File

@ -3009,8 +3009,7 @@ static int __init drbd_init(void)
spin_lock_init(&retry.lock);
INIT_LIST_HEAD(&retry.writes);
if (drbd_debugfs_init())
pr_notice("failed to initialize debugfs -- will not be available\n");
drbd_debugfs_init();
pr_info("initialized. "
"Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",