linux-sg2042/fs/orangefs/orangefs-debugfs.c

455 lines
10 KiB
C

/*
* What: /sys/kernel/debug/orangefs/debug-help
* Date: June 2015
* Contact: Mike Marshall <hubcap@omnibond.com>
* Description:
* List of client and kernel debug keywords.
*
*
* What: /sys/kernel/debug/orangefs/client-debug
* Date: June 2015
* Contact: Mike Marshall <hubcap@omnibond.com>
* Description:
* Debug setting for "the client", the userspace
* helper for the kernel module.
*
*
* What: /sys/kernel/debug/orangefs/kernel-debug
* Date: June 2015
* Contact: Mike Marshall <hubcap@omnibond.com>
* Description:
* Debug setting for the orangefs kernel module.
*
* Any of the keywords, or comma-separated lists
* of keywords, from debug-help can be catted to
* client-debug or kernel-debug.
*
* "none", "all" and "verbose" are special keywords
* for client-debug. Setting client-debug to "all"
* is kind of like trying to drink water from a
* fire hose, "verbose" triggers most of the same
* output except for the constant flow of output
* from the main wait loop.
*
* "none" and "all" are similar settings for kernel-debug
* no need for a "verbose".
*/
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "orangefs-debugfs.h"
#include "protocol.h"
#include "orangefs-kernel.h"
static int orangefs_debug_disabled = 1;
static int orangefs_debug_help_open(struct inode *, struct file *);
const struct file_operations debug_help_fops = {
.open = orangefs_debug_help_open,
.read = seq_read,
.release = seq_release,
.llseek = seq_lseek,
};
static void *help_start(struct seq_file *, loff_t *);
static void *help_next(struct seq_file *, void *, loff_t *);
static void help_stop(struct seq_file *, void *);
static int help_show(struct seq_file *, void *);
static const struct seq_operations help_debug_ops = {
.start = help_start,
.next = help_next,
.stop = help_stop,
.show = help_show,
};
/*
* Used to protect data in ORANGEFS_KMOD_DEBUG_FILE and
* ORANGEFS_KMOD_DEBUG_FILE.
*/
static DEFINE_MUTEX(orangefs_debug_lock);
int orangefs_debug_open(struct inode *, struct file *);
static ssize_t orangefs_debug_read(struct file *,
char __user *,
size_t,
loff_t *);
static ssize_t orangefs_debug_write(struct file *,
const char __user *,
size_t,
loff_t *);
static const struct file_operations kernel_debug_fops = {
.open = orangefs_debug_open,
.read = orangefs_debug_read,
.write = orangefs_debug_write,
.llseek = generic_file_llseek,
};
/*
* initialize kmod debug operations, create orangefs debugfs dir and
* ORANGEFS_KMOD_DEBUG_HELP_FILE.
*/
int orangefs_debugfs_init(void)
{
int rc = -ENOMEM;
debug_dir = debugfs_create_dir("orangefs", NULL);
if (!debug_dir) {
pr_info("%s: debugfs_create_dir failed.\n", __func__);
goto out;
}
help_file_dentry = debugfs_create_file(ORANGEFS_KMOD_DEBUG_HELP_FILE,
0444,
debug_dir,
debug_help_string,
&debug_help_fops);
if (!help_file_dentry) {
pr_info("%s: debugfs_create_file failed.\n", __func__);
goto out;
}
orangefs_debug_disabled = 0;
rc = 0;
out:
return rc;
}
void orangefs_debugfs_cleanup(void)
{
debugfs_remove_recursive(debug_dir);
}
/* open ORANGEFS_KMOD_DEBUG_HELP_FILE */
static int orangefs_debug_help_open(struct inode *inode, struct file *file)
{
int rc = -ENODEV;
int ret;
gossip_debug(GOSSIP_DEBUGFS_DEBUG,
"orangefs_debug_help_open: start\n");
if (orangefs_debug_disabled)
goto out;
ret = seq_open(file, &help_debug_ops);
if (ret)
goto out;
((struct seq_file *)(file->private_data))->private = inode->i_private;
rc = 0;
out:
gossip_debug(GOSSIP_DEBUGFS_DEBUG,
"orangefs_debug_help_open: rc:%d:\n",
rc);
return rc;
}
/*
* I think start always gets called again after stop. Start
* needs to return NULL when it is done. The whole "payload"
* in this case is a single (long) string, so by the second
* time we get to start (pos = 1), we're done.
*/
static void *help_start(struct seq_file *m, loff_t *pos)
{
void *payload = NULL;
gossip_debug(GOSSIP_DEBUGFS_DEBUG, "help_start: start\n");
if (*pos == 0)
payload = m->private;
return payload;
}
static void *help_next(struct seq_file *m, void *v, loff_t *pos)
{
gossip_debug(GOSSIP_DEBUGFS_DEBUG, "help_next: start\n");
return NULL;
}
static void help_stop(struct seq_file *m, void *p)
{
gossip_debug(GOSSIP_DEBUGFS_DEBUG, "help_stop: start\n");
}
static int help_show(struct seq_file *m, void *v)
{
gossip_debug(GOSSIP_DEBUGFS_DEBUG, "help_show: start\n");
seq_puts(m, v);
return 0;
}
/*
* initialize the kernel-debug file.
*/
int orangefs_kernel_debug_init(void)
{
int rc = -ENOMEM;
struct dentry *ret;
char *k_buffer = NULL;
gossip_debug(GOSSIP_DEBUGFS_DEBUG, "%s: start\n", __func__);
k_buffer = kzalloc(ORANGEFS_MAX_DEBUG_STRING_LEN, GFP_KERNEL);
if (!k_buffer)
goto out;
if (strlen(kernel_debug_string) + 1 < ORANGEFS_MAX_DEBUG_STRING_LEN) {
strcpy(k_buffer, kernel_debug_string);
strcat(k_buffer, "\n");
} else {
strcpy(k_buffer, "none\n");
pr_info("%s: overflow 1!\n", __func__);
}
ret = debugfs_create_file(ORANGEFS_KMOD_DEBUG_FILE,
0444,
debug_dir,
k_buffer,
&kernel_debug_fops);
if (!ret) {
pr_info("%s: failed to create %s.\n",
__func__,
ORANGEFS_KMOD_DEBUG_FILE);
goto out;
}
rc = 0;
out:
gossip_debug(GOSSIP_DEBUGFS_DEBUG, "%s: rc:%d:\n", __func__, rc);
return rc;
}
/*
* initialize the client-debug file.
*/
int orangefs_client_debug_init(void)
{
int rc = -ENOMEM;
char *c_buffer = NULL;
gossip_debug(GOSSIP_DEBUGFS_DEBUG, "%s: start\n", __func__);
c_buffer = kzalloc(ORANGEFS_MAX_DEBUG_STRING_LEN, GFP_KERNEL);
if (!c_buffer)
goto out;
if (strlen(client_debug_string) + 1 < ORANGEFS_MAX_DEBUG_STRING_LEN) {
strcpy(c_buffer, client_debug_string);
strcat(c_buffer, "\n");
} else {
strcpy(c_buffer, "none\n");
pr_info("%s: overflow! 2\n", __func__);
}
client_debug_dentry = debugfs_create_file(ORANGEFS_CLIENT_DEBUG_FILE,
0444,
debug_dir,
c_buffer,
&kernel_debug_fops);
if (!client_debug_dentry) {
pr_info("%s: failed to create updated %s.\n",
__func__,
ORANGEFS_CLIENT_DEBUG_FILE);
goto out;
}
rc = 0;
out:
gossip_debug(GOSSIP_DEBUGFS_DEBUG, "%s: rc:%d:\n", __func__, rc);
return rc;
}
/* open ORANGEFS_KMOD_DEBUG_FILE or ORANGEFS_CLIENT_DEBUG_FILE.*/
int orangefs_debug_open(struct inode *inode, struct file *file)
{
int rc = -ENODEV;
gossip_debug(GOSSIP_DEBUGFS_DEBUG,
"%s: orangefs_debug_disabled: %d\n",
__func__,
orangefs_debug_disabled);
if (orangefs_debug_disabled)
goto out;
rc = 0;
mutex_lock(&orangefs_debug_lock);
file->private_data = inode->i_private;
mutex_unlock(&orangefs_debug_lock);
out:
gossip_debug(GOSSIP_DEBUGFS_DEBUG,
"orangefs_debug_open: rc: %d\n",
rc);
return rc;
}
static ssize_t orangefs_debug_read(struct file *file,
char __user *ubuf,
size_t count,
loff_t *ppos)
{
char *buf;
int sprintf_ret;
ssize_t read_ret = -ENOMEM;
gossip_debug(GOSSIP_DEBUGFS_DEBUG, "orangefs_debug_read: start\n");
buf = kmalloc(ORANGEFS_MAX_DEBUG_STRING_LEN, GFP_KERNEL);
if (!buf)
goto out;
mutex_lock(&orangefs_debug_lock);
sprintf_ret = sprintf(buf, "%s", (char *)file->private_data);
mutex_unlock(&orangefs_debug_lock);
read_ret = simple_read_from_buffer(ubuf, count, ppos, buf, sprintf_ret);
kfree(buf);
out:
gossip_debug(GOSSIP_DEBUGFS_DEBUG,
"orangefs_debug_read: ret: %zu\n",
read_ret);
return read_ret;
}
static ssize_t orangefs_debug_write(struct file *file,
const char __user *ubuf,
size_t count,
loff_t *ppos)
{
char *buf;
int rc = -EFAULT;
size_t silly = 0;
char *debug_string;
struct orangefs_kernel_op_s *new_op = NULL;
struct client_debug_mask c_mask = { NULL, 0, 0 };
gossip_debug(GOSSIP_DEBUGFS_DEBUG,
"orangefs_debug_write: %s\n",
file->f_path.dentry->d_name.name);
/*
* Thwart users who try to jamb a ridiculous number
* of bytes into the debug file...
*/
if (count > ORANGEFS_MAX_DEBUG_STRING_LEN + 1) {
silly = count;
count = ORANGEFS_MAX_DEBUG_STRING_LEN + 1;
}
buf = kzalloc(ORANGEFS_MAX_DEBUG_STRING_LEN, GFP_KERNEL);
if (!buf)
goto out;
if (copy_from_user(buf, ubuf, count - 1)) {
gossip_debug(GOSSIP_DEBUGFS_DEBUG,
"%s: copy_from_user failed!\n",
__func__);
goto out;
}
/*
* Map the keyword string from userspace into a valid debug mask.
* The mapping process involves mapping the human-inputted string
* into a valid mask, and then rebuilding the string from the
* verified valid mask.
*
* A service operation is required to set a new client-side
* debug mask.
*/
if (!strcmp(file->f_path.dentry->d_name.name,
ORANGEFS_KMOD_DEBUG_FILE)) {
debug_string_to_mask(buf, &gossip_debug_mask, 0);
debug_mask_to_string(&gossip_debug_mask, 0);
debug_string = kernel_debug_string;
gossip_debug(GOSSIP_DEBUGFS_DEBUG,
"New kernel debug string is %s\n",
kernel_debug_string);
} else {
/* Can't reset client debug mask if client is not running. */
if (is_daemon_in_service()) {
pr_info("%s: Client not running :%d:\n",
__func__,
is_daemon_in_service());
goto out;
}
debug_string_to_mask(buf, &c_mask, 1);
debug_mask_to_string(&c_mask, 1);
debug_string = client_debug_string;
new_op = op_alloc(ORANGEFS_VFS_OP_PARAM);
if (!new_op) {
pr_info("%s: op_alloc failed!\n", __func__);
goto out;
}
new_op->upcall.req.param.op =
ORANGEFS_PARAM_REQUEST_OP_TWO_MASK_VALUES;
new_op->upcall.req.param.type = ORANGEFS_PARAM_REQUEST_SET;
memset(new_op->upcall.req.param.s_value,
0,
ORANGEFS_MAX_DEBUG_STRING_LEN);
sprintf(new_op->upcall.req.param.s_value,
"%llx %llx\n",
c_mask.mask1,
c_mask.mask2);
/* service_operation returns 0 on success... */
rc = service_operation(new_op,
"orangefs_param",
ORANGEFS_OP_INTERRUPTIBLE);
if (rc)
gossip_debug(GOSSIP_DEBUGFS_DEBUG,
"%s: service_operation failed! rc:%d:\n",
__func__,
rc);
op_release(new_op);
}
mutex_lock(&orangefs_debug_lock);
memset(file->f_inode->i_private, 0, ORANGEFS_MAX_DEBUG_STRING_LEN);
sprintf((char *)file->f_inode->i_private, "%s\n", debug_string);
mutex_unlock(&orangefs_debug_lock);
*ppos += count;
if (silly)
rc = silly;
else
rc = count;
out:
gossip_debug(GOSSIP_DEBUGFS_DEBUG,
"orangefs_debug_write: rc: %d\n",
rc);
kfree(buf);
return rc;
}