575 lines
17 KiB
C
575 lines
17 KiB
C
#include <linux/proc_fs.h>
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#include <linux/kmod.h>
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#include <linux/uaccess.h>
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#include <linux/ctype.h>
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#include <linux/sysctl.h>
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#include <sys/sysmacros.h>
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#include <sys/kmem.h>
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#include <sys/debug.h>
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#include "config.h"
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#ifdef DEBUG_SUBSYSTEM
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#undef DEBUG_SUBSYSTEM
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#endif
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#define DEBUG_SUBSYSTEM S_PROC
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static struct ctl_table_header *spl_header = NULL;
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static unsigned long table_min = 0;
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static unsigned long table_max = ~0;
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#define CTL_SPL 0x87
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enum {
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CTL_DEBUG_SUBSYS = 1, /* Debug subsystem */
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CTL_DEBUG_MASK, /* Debug mask */
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CTL_DEBUG_PRINTK, /* Force all messages to console */
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CTL_DEBUG_MB, /* Debug buffer size */
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CTL_DEBUG_BINARY, /* Include binary data in buffer */
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CTL_DEBUG_CATASTROPHE, /* Set if we have BUG'd or panic'd */
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CTL_DEBUG_PANIC_ON_BUG, /* Set if we should panic on BUG */
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CTL_DEBUG_PATH, /* Dump log location */
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CTL_DEBUG_DUMP, /* Dump debug buffer to file */
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CTL_DEBUG_FORCE_BUG, /* Hook to force a BUG */
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CTL_CONSOLE_RATELIMIT, /* Ratelimit console messages */
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CTL_CONSOLE_MAX_DELAY_CS, /* Max delay at which we skip messages */
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CTL_CONSOLE_MIN_DELAY_CS, /* Init delay at which we skip messages */
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CTL_CONSOLE_BACKOFF, /* Delay increase factor */
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CTL_STACK_SIZE, /* Max observed stack size */
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#ifdef DEBUG_KMEM
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CTL_KMEM_KMEMUSED, /* Crrently alloc'd kmem bytes */
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CTL_KMEM_KMEMMAX, /* Max alloc'd by kmem bytes */
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CTL_KMEM_VMEMUSED, /* Currently alloc'd vmem bytes */
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CTL_KMEM_VMEMMAX, /* Max alloc'd by vmem bytes */
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#endif
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CTL_HOSTID, /* Host id reported by /usr/bin/hostid */
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CTL_HW_SERIAL, /* Hardware serial number from hostid */
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};
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static int
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proc_copyin_string(char *kbuffer, int kbuffer_size,
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const char *ubuffer, int ubuffer_size)
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{
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int size;
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if (ubuffer_size > kbuffer_size)
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return -EOVERFLOW;
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if (copy_from_user((void *)kbuffer, (void *)ubuffer, ubuffer_size))
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return -EFAULT;
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/* strip trailing whitespace */
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size = strnlen(kbuffer, ubuffer_size);
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while (size-- >= 0)
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if (!isspace(kbuffer[size]))
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break;
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/* empty string */
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if (size < 0)
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return -EINVAL;
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/* no space to terminate */
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if (size == kbuffer_size)
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return -EOVERFLOW;
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kbuffer[size + 1] = 0;
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return 0;
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}
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static int
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proc_copyout_string(char *ubuffer, int ubuffer_size,
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const char *kbuffer, char *append)
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{
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/* NB if 'append' != NULL, it's a single character to append to the
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* copied out string - usually "\n", for /proc entries and
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* (i.e. a terminating zero byte) for sysctl entries
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*/
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int size = MIN(strlen(kbuffer), ubuffer_size);
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if (copy_to_user(ubuffer, kbuffer, size))
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return -EFAULT;
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if (append != NULL && size < ubuffer_size) {
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if (copy_to_user(ubuffer + size, append, 1))
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return -EFAULT;
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size++;
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}
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return size;
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}
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static int
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proc_dobitmasks(struct ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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unsigned long *mask = table->data;
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int is_subsys = (mask == &spl_debug_subsys) ? 1 : 0;
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int is_printk = (mask == &spl_debug_printk) ? 1 : 0;
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int size = 512, rc;
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char *str;
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ENTRY;
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str = kmem_alloc(size, KM_SLEEP);
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if (str == NULL)
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RETURN(-ENOMEM);
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if (write) {
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rc = proc_copyin_string(str, size, buffer, *lenp);
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if (rc < 0)
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RETURN(rc);
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rc = spl_debug_str2mask(mask, str, is_subsys);
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/* Always print BUG/ASSERT to console, so keep this mask */
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if (is_printk)
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*mask |= D_EMERG;
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*ppos += *lenp;
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} else {
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rc = spl_debug_mask2str(str, size, *mask, is_subsys);
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if (*ppos >= rc)
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rc = 0;
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else
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rc = proc_copyout_string(buffer, *lenp,
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str + *ppos, "\n");
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if (rc >= 0) {
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*lenp = rc;
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*ppos += rc;
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}
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}
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kmem_free(str, size);
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RETURN(rc);
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}
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static int
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proc_debug_mb(struct ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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char str[32];
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int rc, len;
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ENTRY;
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if (write) {
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rc = proc_copyin_string(str, sizeof(str), buffer, *lenp);
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if (rc < 0)
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RETURN(rc);
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rc = spl_debug_set_mb(simple_strtoul(str, NULL, 0));
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*ppos += *lenp;
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} else {
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len = snprintf(str, sizeof(str), "%d", spl_debug_get_mb());
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if (*ppos >= len)
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rc = 0;
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else
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rc = proc_copyout_string(buffer, *lenp, str + *ppos, "\n");
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if (rc >= 0) {
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*lenp = rc;
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*ppos += rc;
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}
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}
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RETURN(rc);
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}
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static int
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proc_dump_kernel(struct ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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ENTRY;
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if (write) {
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spl_debug_dumplog(0);
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*ppos += *lenp;
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} else {
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*lenp = 0;
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}
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RETURN(0);
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}
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static int
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proc_force_bug(struct ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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ENTRY;
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if (write) {
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CERROR("Crashing due to forced SBUG\n");
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SBUG();
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/* Unreachable */
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} else {
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*lenp = 0;
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}
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RETURN(0);
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}
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static int
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proc_console_max_delay_cs(struct ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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int rc, max_delay_cs;
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struct ctl_table dummy = *table;
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long d;
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ENTRY;
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dummy.data = &max_delay_cs;
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dummy.proc_handler = &proc_dointvec;
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if (write) {
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max_delay_cs = 0;
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rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
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if (rc < 0)
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RETURN(rc);
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if (max_delay_cs <= 0)
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RETURN(-EINVAL);
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d = (max_delay_cs * HZ) / 100;
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if (d == 0 || d < spl_console_min_delay)
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RETURN(-EINVAL);
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spl_console_max_delay = d;
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} else {
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max_delay_cs = (spl_console_max_delay * 100) / HZ;
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rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
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}
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RETURN(rc);
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}
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static int
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proc_console_min_delay_cs(struct ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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int rc, min_delay_cs;
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struct ctl_table dummy = *table;
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long d;
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ENTRY;
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dummy.data = &min_delay_cs;
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dummy.proc_handler = &proc_dointvec;
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if (write) {
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min_delay_cs = 0;
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rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
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if (rc < 0)
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RETURN(rc);
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if (min_delay_cs <= 0)
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RETURN(-EINVAL);
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d = (min_delay_cs * HZ) / 100;
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if (d == 0 || d > spl_console_max_delay)
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RETURN(-EINVAL);
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spl_console_min_delay = d;
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} else {
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min_delay_cs = (spl_console_min_delay * 100) / HZ;
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rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
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}
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RETURN(rc);
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}
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static int
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proc_console_backoff(struct ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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int rc, backoff;
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struct ctl_table dummy = *table;
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ENTRY;
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dummy.data = &backoff;
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dummy.proc_handler = &proc_dointvec;
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if (write) {
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backoff = 0;
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rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
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if (rc < 0)
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RETURN(rc);
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if (backoff <= 0)
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RETURN(-EINVAL);
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spl_console_backoff = backoff;
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} else {
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backoff = spl_console_backoff;
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rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
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}
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RETURN(rc);
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}
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static int
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proc_doatomic64(struct ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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int rc = 0;
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unsigned long min = 0, max = ~0, val;
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struct ctl_table dummy = *table;
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ENTRY;
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dummy.data = &val;
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dummy.proc_handler = &proc_dointvec;
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dummy.extra1 = &min;
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dummy.extra2 = &max;
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if (write) {
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*ppos += *lenp;
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} else {
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val = atomic_read((atomic64_t *)table->data);
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rc = proc_doulongvec_minmax(&dummy, write, filp,
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buffer, lenp, ppos);
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}
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RETURN(rc);
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}
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static int
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proc_dohostid(struct ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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int len, rc = 0;
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int32_t val;
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char *end, str[32];
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ENTRY;
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if (write) {
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/* We can't use proc_doulongvec_minmax() in the write
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* case hear because hostid while a hex value has no
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* leading 0x which confuses the helper function. */
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rc = proc_copyin_string(str, sizeof(str), buffer, *lenp);
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if (rc < 0)
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RETURN(rc);
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val = simple_strtol(str, &end, 16);
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if (str == end)
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RETURN(-EINVAL);
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spl_hostid = (long)val;
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sprintf(hw_serial, "%u", (val >= 0) ? val : -val);
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*ppos += *lenp;
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} else {
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len = snprintf(str, sizeof(str), "%lx", spl_hostid);
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if (*ppos >= len)
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rc = 0;
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else
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rc = proc_copyout_string(buffer, *lenp, str + *ppos, "\n");
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if (rc >= 0) {
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*lenp = rc;
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*ppos += rc;
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}
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}
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RETURN(rc);
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}
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static struct ctl_table spl_table[] = {
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/* NB No .strategy entries have been provided since
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* sysctl(8) prefers to go via /proc for portability.
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*/
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{
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.ctl_name = CTL_DEBUG_SUBSYS,
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.procname = "debug_subsystem",
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.data = &spl_debug_subsys,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = &proc_dobitmasks
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},
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{
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.ctl_name = CTL_DEBUG_MASK,
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.procname = "debug_mask",
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.data = &spl_debug_mask,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = &proc_dobitmasks
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},
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{
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.ctl_name = CTL_DEBUG_PRINTK,
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.procname = "debug_printk",
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.data = &spl_debug_printk,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = &proc_dobitmasks
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},
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{
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.ctl_name = CTL_DEBUG_MB,
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.procname = "debug_mb",
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.mode = 0644,
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.proc_handler = &proc_debug_mb,
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},
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{
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.ctl_name = CTL_DEBUG_BINARY,
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.procname = "debug_binary",
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.data = &spl_debug_binary,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = CTL_DEBUG_CATASTROPHE,
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.procname = "catastrophe",
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.data = &spl_debug_catastrophe,
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.maxlen = sizeof(int),
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.mode = 0444,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = CTL_DEBUG_PANIC_ON_BUG,
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.procname = "panic_on_bug",
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.data = &spl_debug_panic_on_bug,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.ctl_name = CTL_DEBUG_PATH,
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.procname = "debug_path",
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.data = spl_debug_file_path,
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.maxlen = sizeof(spl_debug_file_path),
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.mode = 0644,
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.proc_handler = &proc_dostring,
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},
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{
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.ctl_name = CTL_DEBUG_DUMP,
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.procname = "debug_dump",
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.mode = 0200,
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.proc_handler = &proc_dump_kernel,
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},
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{ .ctl_name = CTL_DEBUG_FORCE_BUG,
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.procname = "force_bug",
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.mode = 0200,
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.proc_handler = &proc_force_bug,
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},
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{
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.ctl_name = CTL_CONSOLE_RATELIMIT,
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.procname = "console_ratelimit",
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.data = &spl_console_ratelimit,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = CTL_CONSOLE_MAX_DELAY_CS,
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.procname = "console_max_delay_centisecs",
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_console_max_delay_cs,
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},
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{
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.ctl_name = CTL_CONSOLE_MIN_DELAY_CS,
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.procname = "console_min_delay_centisecs",
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_console_min_delay_cs,
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},
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{
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.ctl_name = CTL_CONSOLE_BACKOFF,
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.procname = "console_backoff",
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_console_backoff,
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},
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{
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.ctl_name = CTL_STACK_SIZE,
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.procname = "stack_max",
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.data = &spl_debug_stack,
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.maxlen = sizeof(int),
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.mode = 0444,
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.proc_handler = &proc_dointvec,
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},
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#ifdef DEBUG_KMEM
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{
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.ctl_name = CTL_KMEM_KMEMUSED,
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.procname = "kmem_used",
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.data = &kmem_alloc_used,
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.maxlen = sizeof(atomic64_t),
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.mode = 0444,
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.proc_handler = &proc_doatomic64,
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},
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{
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.ctl_name = CTL_KMEM_KMEMMAX,
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.procname = "kmem_max",
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.data = &kmem_alloc_max,
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.maxlen = sizeof(unsigned long),
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.extra1 = &table_min,
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.extra2 = &table_max,
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.mode = 0444,
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.proc_handler = &proc_doulongvec_minmax,
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},
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{
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.ctl_name = CTL_KMEM_VMEMUSED,
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.procname = "vmem_used",
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.data = &vmem_alloc_used,
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.maxlen = sizeof(atomic64_t),
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.mode = 0444,
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.proc_handler = &proc_doatomic64,
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},
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{
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.ctl_name = CTL_KMEM_VMEMMAX,
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.procname = "vmem_max",
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.data = &vmem_alloc_max,
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.maxlen = sizeof(unsigned long),
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.extra1 = &table_min,
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.extra2 = &table_max,
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.mode = 0444,
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.proc_handler = &proc_doulongvec_minmax,
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},
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#endif
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{
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.ctl_name = CTL_HOSTID,
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.procname = "hostid",
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.data = &spl_hostid,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = &proc_dohostid,
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},
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{
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.ctl_name = CTL_HW_SERIAL,
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.procname = "hw_serial",
|
|
.data = hw_serial,
|
|
.maxlen = sizeof(hw_serial),
|
|
.mode = 0444,
|
|
.proc_handler = &proc_dostring,
|
|
},
|
|
{ 0 },
|
|
};
|
|
|
|
static struct ctl_table spl_dir_table[] = {
|
|
{
|
|
.ctl_name = CTL_SPL,
|
|
.procname = "spl",
|
|
.mode = 0555,
|
|
.child = spl_table,
|
|
},
|
|
{0}
|
|
};
|
|
|
|
int
|
|
proc_init(void)
|
|
{
|
|
ENTRY;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
spl_header = register_sysctl_table(spl_dir_table, 0);
|
|
if (spl_header == NULL)
|
|
RETURN(-EUNATCH);
|
|
#endif
|
|
RETURN(0);
|
|
}
|
|
|
|
void
|
|
proc_fini(void)
|
|
{
|
|
ENTRY;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
ASSERT(spl_header != NULL);
|
|
unregister_sysctl_table(spl_header);
|
|
#endif
|
|
EXIT;
|
|
}
|