linux/net/sunrpc/debugfs.c
Linus Torvalds 0961f0c00e NFS Client Updates for Linux 5.15
- New Features:
   - Better client responsiveness when server isn't replying
   - Use refcount_t in sunrpc rpc_client refcount tracking
   - Add srcaddr and dst_port to the sunrpc sysfs info files
   - Add basic support for connection sharing between servers with multiple NICs`
 
 - Bugfixes and Cleanups:
   - Sunrpc tracepoint cleanups
   - Disconnect after ib_post_send() errors to avoid deadlocks
   - Fix for tearing down rpcrdma_reps
   - Fix a potential pNFS layoutget livelock loop
   - pNFS layout barrier fixes
   - Fix a potential memory corruption in rpc_wake_up_queued_task_set_status()
   - Fix reconnection locking
   - Fix return value of get_srcport()
   - Remove rpcrdma_post_sends()
   - Remove pNFS dead code
   - Remove copy size restriction for inter-server copies
   - Overhaul the NFS callback service
   - Clean up sunrpc TCP socket shutdowns
   - Always provide aligned buffers to RPC read layers
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Merge tag 'nfs-for-5.15-1' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull NFS client updates from Anna Schumaker:
 "New Features:
   - Better client responsiveness when server isn't replying
   - Use refcount_t in sunrpc rpc_client refcount tracking
   - Add srcaddr and dst_port to the sunrpc sysfs info files
   - Add basic support for connection sharing between servers with multiple NICs`

  Bugfixes and Cleanups:
   - Sunrpc tracepoint cleanups
   - Disconnect after ib_post_send() errors to avoid deadlocks
   - Fix for tearing down rpcrdma_reps
   - Fix a potential pNFS layoutget livelock loop
   - pNFS layout barrier fixes
   - Fix a potential memory corruption in rpc_wake_up_queued_task_set_status()
   - Fix reconnection locking
   - Fix return value of get_srcport()
   - Remove rpcrdma_post_sends()
   - Remove pNFS dead code
   - Remove copy size restriction for inter-server copies
   - Overhaul the NFS callback service
   - Clean up sunrpc TCP socket shutdowns
   - Always provide aligned buffers to RPC read layers"

* tag 'nfs-for-5.15-1' of git://git.linux-nfs.org/projects/anna/linux-nfs: (39 commits)
  NFS: Always provide aligned buffers to the RPC read layers
  NFSv4.1 add network transport when session trunking is detected
  SUNRPC enforce creation of no more than max_connect xprts
  NFSv4 introduce max_connect mount options
  SUNRPC add xps_nunique_destaddr_xprts to xprt_switch_info in sysfs
  SUNRPC keep track of number of transports to unique addresses
  NFSv3: Delete duplicate judgement in nfs3_async_handle_jukebox
  SUNRPC: Tweak TCP socket shutdown in the RPC client
  SUNRPC: Simplify socket shutdown when not reusing TCP ports
  NFSv4.2: remove restriction of copy size for inter-server copy.
  NFS: Clean up the synopsis of callback process_op()
  NFS: Extract the xdr_init_encode/decode() calls from decode_compound
  NFS: Remove unused callback void decoder
  NFS: Add a private local dispatcher for NFSv4 callback operations
  SUNRPC: Eliminate the RQ_AUTHERR flag
  SUNRPC: Set rq_auth_stat in the pg_authenticate() callout
  SUNRPC: Add svc_rqst::rq_auth_stat
  SUNRPC: Add dst_port to the sysfs xprt info file
  SUNRPC: Add srcaddr as a file in sysfs
  sunrpc: Fix return value of get_srcport()
  ...
2021-09-04 10:25:26 -07:00

292 lines
6.3 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* debugfs interface for sunrpc
*
* (c) 2014 Jeff Layton <jlayton@primarydata.com>
*/
#include <linux/debugfs.h>
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/clnt.h>
#include "netns.h"
#include "fail.h"
static struct dentry *topdir;
static struct dentry *rpc_clnt_dir;
static struct dentry *rpc_xprt_dir;
static int
tasks_show(struct seq_file *f, void *v)
{
u32 xid = 0;
struct rpc_task *task = v;
struct rpc_clnt *clnt = task->tk_client;
const char *rpc_waitq = "none";
if (RPC_IS_QUEUED(task))
rpc_waitq = rpc_qname(task->tk_waitqueue);
if (task->tk_rqstp)
xid = be32_to_cpu(task->tk_rqstp->rq_xid);
seq_printf(f, "%5u %04x %6d 0x%x 0x%x %8ld %ps %sv%u %s a:%ps q:%s\n",
task->tk_pid, task->tk_flags, task->tk_status,
clnt->cl_clid, xid, rpc_task_timeout(task), task->tk_ops,
clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
task->tk_action, rpc_waitq);
return 0;
}
static void *
tasks_start(struct seq_file *f, loff_t *ppos)
__acquires(&clnt->cl_lock)
{
struct rpc_clnt *clnt = f->private;
loff_t pos = *ppos;
struct rpc_task *task;
spin_lock(&clnt->cl_lock);
list_for_each_entry(task, &clnt->cl_tasks, tk_task)
if (pos-- == 0)
return task;
return NULL;
}
static void *
tasks_next(struct seq_file *f, void *v, loff_t *pos)
{
struct rpc_clnt *clnt = f->private;
struct rpc_task *task = v;
struct list_head *next = task->tk_task.next;
++*pos;
/* If there's another task on list, return it */
if (next == &clnt->cl_tasks)
return NULL;
return list_entry(next, struct rpc_task, tk_task);
}
static void
tasks_stop(struct seq_file *f, void *v)
__releases(&clnt->cl_lock)
{
struct rpc_clnt *clnt = f->private;
spin_unlock(&clnt->cl_lock);
}
static const struct seq_operations tasks_seq_operations = {
.start = tasks_start,
.next = tasks_next,
.stop = tasks_stop,
.show = tasks_show,
};
static int tasks_open(struct inode *inode, struct file *filp)
{
int ret = seq_open(filp, &tasks_seq_operations);
if (!ret) {
struct seq_file *seq = filp->private_data;
struct rpc_clnt *clnt = seq->private = inode->i_private;
if (!refcount_inc_not_zero(&clnt->cl_count)) {
seq_release(inode, filp);
ret = -EINVAL;
}
}
return ret;
}
static int
tasks_release(struct inode *inode, struct file *filp)
{
struct seq_file *seq = filp->private_data;
struct rpc_clnt *clnt = seq->private;
rpc_release_client(clnt);
return seq_release(inode, filp);
}
static const struct file_operations tasks_fops = {
.owner = THIS_MODULE,
.open = tasks_open,
.read = seq_read,
.llseek = seq_lseek,
.release = tasks_release,
};
static int do_xprt_debugfs(struct rpc_clnt *clnt, struct rpc_xprt *xprt, void *numv)
{
int len;
char name[24]; /* enough for "../../rpc_xprt/ + 8 hex digits + NULL */
char link[9]; /* enough for 8 hex digits + NULL */
int *nump = numv;
if (IS_ERR_OR_NULL(xprt->debugfs))
return 0;
len = snprintf(name, sizeof(name), "../../rpc_xprt/%s",
xprt->debugfs->d_name.name);
if (len >= sizeof(name))
return -1;
if (*nump == 0)
strcpy(link, "xprt");
else {
len = snprintf(link, sizeof(link), "xprt%d", *nump);
if (len >= sizeof(link))
return -1;
}
debugfs_create_symlink(link, clnt->cl_debugfs, name);
(*nump)++;
return 0;
}
void
rpc_clnt_debugfs_register(struct rpc_clnt *clnt)
{
int len;
char name[9]; /* enough for 8 hex digits + NULL */
int xprtnum = 0;
len = snprintf(name, sizeof(name), "%x", clnt->cl_clid);
if (len >= sizeof(name))
return;
/* make the per-client dir */
clnt->cl_debugfs = debugfs_create_dir(name, rpc_clnt_dir);
/* make tasks file */
debugfs_create_file("tasks", S_IFREG | 0400, clnt->cl_debugfs, clnt,
&tasks_fops);
rpc_clnt_iterate_for_each_xprt(clnt, do_xprt_debugfs, &xprtnum);
}
void
rpc_clnt_debugfs_unregister(struct rpc_clnt *clnt)
{
debugfs_remove_recursive(clnt->cl_debugfs);
clnt->cl_debugfs = NULL;
}
static int
xprt_info_show(struct seq_file *f, void *v)
{
struct rpc_xprt *xprt = f->private;
seq_printf(f, "netid: %s\n", xprt->address_strings[RPC_DISPLAY_NETID]);
seq_printf(f, "addr: %s\n", xprt->address_strings[RPC_DISPLAY_ADDR]);
seq_printf(f, "port: %s\n", xprt->address_strings[RPC_DISPLAY_PORT]);
seq_printf(f, "state: 0x%lx\n", xprt->state);
return 0;
}
static int
xprt_info_open(struct inode *inode, struct file *filp)
{
int ret;
struct rpc_xprt *xprt = inode->i_private;
ret = single_open(filp, xprt_info_show, xprt);
if (!ret) {
if (!xprt_get(xprt)) {
single_release(inode, filp);
ret = -EINVAL;
}
}
return ret;
}
static int
xprt_info_release(struct inode *inode, struct file *filp)
{
struct rpc_xprt *xprt = inode->i_private;
xprt_put(xprt);
return single_release(inode, filp);
}
static const struct file_operations xprt_info_fops = {
.owner = THIS_MODULE,
.open = xprt_info_open,
.read = seq_read,
.llseek = seq_lseek,
.release = xprt_info_release,
};
void
rpc_xprt_debugfs_register(struct rpc_xprt *xprt)
{
int len, id;
static atomic_t cur_id;
char name[9]; /* 8 hex digits + NULL term */
id = (unsigned int)atomic_inc_return(&cur_id);
len = snprintf(name, sizeof(name), "%x", id);
if (len >= sizeof(name))
return;
/* make the per-client dir */
xprt->debugfs = debugfs_create_dir(name, rpc_xprt_dir);
/* make tasks file */
debugfs_create_file("info", S_IFREG | 0400, xprt->debugfs, xprt,
&xprt_info_fops);
}
void
rpc_xprt_debugfs_unregister(struct rpc_xprt *xprt)
{
debugfs_remove_recursive(xprt->debugfs);
xprt->debugfs = NULL;
}
#if IS_ENABLED(CONFIG_FAIL_SUNRPC)
struct fail_sunrpc_attr fail_sunrpc = {
.attr = FAULT_ATTR_INITIALIZER,
};
EXPORT_SYMBOL_GPL(fail_sunrpc);
static void fail_sunrpc_init(void)
{
struct dentry *dir;
dir = fault_create_debugfs_attr("fail_sunrpc", NULL,
&fail_sunrpc.attr);
debugfs_create_bool("ignore-client-disconnect", S_IFREG | 0600, dir,
&fail_sunrpc.ignore_client_disconnect);
debugfs_create_bool("ignore-server-disconnect", S_IFREG | 0600, dir,
&fail_sunrpc.ignore_server_disconnect);
}
#else
static void fail_sunrpc_init(void)
{
}
#endif
void __exit
sunrpc_debugfs_exit(void)
{
debugfs_remove_recursive(topdir);
topdir = NULL;
rpc_clnt_dir = NULL;
rpc_xprt_dir = NULL;
}
void __init
sunrpc_debugfs_init(void)
{
topdir = debugfs_create_dir("sunrpc", NULL);
rpc_clnt_dir = debugfs_create_dir("rpc_clnt", topdir);
rpc_xprt_dir = debugfs_create_dir("rpc_xprt", topdir);
fail_sunrpc_init();
}