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