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034f1b331e
mirror_zfs/module/spl/spl-proc.c
Brian Behlendorf 034f1b331e Fix spl_kmem_init_kallsyms_lookup() panic 
Due to I/O buffering the helper may return successfully before
the proc handler has a chance to execute.  To catch this case
wait up to 1 second to verify spl_kallsyms_lookup_name_fn was
updated to a non SYMBOL_POISON value.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes zfsonlinux/zfs#699
Closes zfsonlinux/zfs#859
2012-12-19 09:06:35 -08:00

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/*****************************************************************************\
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
* For details, see <http://github.com/behlendorf/spl/>.
*
* The SPL is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
*****************************************************************************
* Solaris Porting Layer (SPL) Proc Implementation.
\*****************************************************************************/
#include <sys/systeminfo.h>
#include <sys/kstat.h>
#include <linux/kmod.h>
#include <linux/seq_file.h>
#include <linux/proc_compat.h>
#include <spl-debug.h>
#ifdef SS_DEBUG_SUBSYS
#undef SS_DEBUG_SUBSYS
#endif
#define SS_DEBUG_SUBSYS SS_PROC
#ifdef DEBUG_KMEM
static unsigned long table_min = 0;
static unsigned long table_max = ~0;
#endif
#ifdef CONFIG_SYSCTL
static struct ctl_table_header *spl_header = NULL;
#endif /* CONFIG_SYSCTL */
static struct proc_dir_entry *proc_spl = NULL;
#ifdef DEBUG_KMEM
static struct proc_dir_entry *proc_spl_kmem = NULL;
static struct proc_dir_entry *proc_spl_kmem_slab = NULL;
#endif /* DEBUG_KMEM */
struct proc_dir_entry *proc_spl_kstat = NULL;
#ifdef HAVE_CTL_NAME
#ifdef HAVE_CTL_UNNUMBERED
#define CTL_SPL CTL_UNNUMBERED
#define CTL_SPL_DEBUG CTL_UNNUMBERED
#define CTL_SPL_VM CTL_UNNUMBERED
#define CTL_SPL_MUTEX CTL_UNNUMBERED
#define CTL_SPL_KMEM CTL_UNNUMBERED
#define CTL_SPL_KSTAT CTL_UNNUMBERED
#define CTL_VERSION CTL_UNNUMBERED /* Version */
#define CTL_HOSTID CTL_UNNUMBERED /* Host id by /usr/bin/hostid */
#define CTL_HW_SERIAL CTL_UNNUMBERED /* HW serial number by hostid */
#define CTL_KALLSYMS CTL_UNNUMBERED /* kallsyms_lookup_name addr */
#define CTL_DEBUG_SUBSYS CTL_UNNUMBERED /* Debug subsystem */
#define CTL_DEBUG_MASK CTL_UNNUMBERED /* Debug mask */
#define CTL_DEBUG_PRINTK CTL_UNNUMBERED /* All messages to console */
#define CTL_DEBUG_MB CTL_UNNUMBERED /* Debug buffer size */
#define CTL_DEBUG_BINARY CTL_UNNUMBERED /* Binary data in buffer */
#define CTL_DEBUG_CATASTROPHE CTL_UNNUMBERED /* Set if BUG'd or panic'd */
#define CTL_DEBUG_PANIC_ON_BUG CTL_UNNUMBERED /* Should panic on BUG */
#define CTL_DEBUG_PATH CTL_UNNUMBERED /* Dump log location */
#define CTL_DEBUG_DUMP CTL_UNNUMBERED /* Dump debug buffer to file */
#define CTL_DEBUG_FORCE_BUG CTL_UNNUMBERED /* Hook to force a BUG */
#define CTL_DEBUG_STACK_SIZE CTL_UNNUMBERED /* Max observed stack size */
#define CTL_CONSOLE_RATELIMIT CTL_UNNUMBERED /* Ratelimit console messages */
#define CTL_CONSOLE_MAX_DELAY_CS CTL_UNNUMBERED /* Max delay skip messages */
#define CTL_CONSOLE_MIN_DELAY_CS CTL_UNNUMBERED /* Init delay skip messages */
#define CTL_CONSOLE_BACKOFF CTL_UNNUMBERED /* Delay increase factor */
#define CTL_VM_MINFREE CTL_UNNUMBERED /* Minimum free memory */
#define CTL_VM_DESFREE CTL_UNNUMBERED /* Desired free memory */
#define CTL_VM_LOTSFREE CTL_UNNUMBERED /* Lots of free memory */
#define CTL_VM_NEEDFREE CTL_UNNUMBERED /* Need free memory */
#define CTL_VM_SWAPFS_MINFREE CTL_UNNUMBERED /* Minimum swapfs memory */
#define CTL_VM_SWAPFS_RESERVE CTL_UNNUMBERED /* Reserved swapfs memory */
#define CTL_VM_AVAILRMEM CTL_UNNUMBERED /* Easily available memory */
#define CTL_VM_FREEMEM CTL_UNNUMBERED /* Free memory */
#define CTL_VM_PHYSMEM CTL_UNNUMBERED /* Total physical memory */
#ifdef DEBUG_KMEM
#define CTL_KMEM_KMEMUSED CTL_UNNUMBERED /* Alloc'd kmem bytes */
#define CTL_KMEM_KMEMMAX CTL_UNNUMBERED /* Max alloc'd by kmem bytes */
#define CTL_KMEM_VMEMUSED CTL_UNNUMBERED /* Alloc'd vmem bytes */
#define CTL_KMEM_VMEMMAX CTL_UNNUMBERED /* Max alloc'd by vmem bytes */
#define CTL_KMEM_SLAB_KMEMTOTAL CTL_UNNUMBERED /* Total kmem slab size */
#define CTL_KMEM_SLAB_KMEMALLOC CTL_UNNUMBERED /* Alloc'd kmem slab size */
#define CTL_KMEM_SLAB_KMEMMAX CTL_UNNUMBERED /* Max kmem slab size */
#define CTL_KMEM_SLAB_VMEMTOTAL CTL_UNNUMBERED /* Total vmem slab size */
#define CTL_KMEM_SLAB_VMEMALLOC CTL_UNNUMBERED /* Alloc'd vmem slab size */
#define CTL_KMEM_SLAB_VMEMMAX CTL_UNNUMBERED /* Max vmem slab size */
#endif
#else /* HAVE_CTL_UNNUMBERED */
enum {
CTL_SPL = 0x87,
CTL_SPL_DEBUG = 0x88,
CTL_SPL_VM = 0x89,
CTL_SPL_MUTEX = 0x90,
CTL_SPL_KMEM = 0x91,
CTL_SPL_KSTAT = 0x92,
};
enum {
CTL_VERSION = 1, /* Version */
CTL_HOSTID, /* Host id reported by /usr/bin/hostid */
CTL_HW_SERIAL, /* Hardware serial number from hostid */
CTL_KALLSYMS, /* Address of kallsyms_lookup_name */
#ifdef DEBUG_LOG
CTL_DEBUG_SUBSYS, /* Debug subsystem */
CTL_DEBUG_MASK, /* Debug mask */
CTL_DEBUG_PRINTK, /* Force all messages to console */
CTL_DEBUG_MB, /* Debug buffer size */
CTL_DEBUG_BINARY, /* Include binary data in buffer */
CTL_DEBUG_CATASTROPHE, /* Set if we have BUG'd or panic'd */
CTL_DEBUG_PANIC_ON_BUG, /* Set if we should panic on BUG */
CTL_DEBUG_PATH, /* Dump log location */
CTL_DEBUG_DUMP, /* Dump debug buffer to file */
CTL_DEBUG_FORCE_BUG, /* Hook to force a BUG */
CTL_DEBUG_STACK_SIZE, /* Max observed stack size */
#endif
CTL_CONSOLE_RATELIMIT, /* Ratelimit console messages */
CTL_CONSOLE_MAX_DELAY_CS, /* Max delay which we skip messages */
CTL_CONSOLE_MIN_DELAY_CS, /* Init delay which we skip messages */
CTL_CONSOLE_BACKOFF, /* Delay increase factor */
CTL_VM_MINFREE, /* Minimum free memory threshold */
CTL_VM_DESFREE, /* Desired free memory threshold */
CTL_VM_LOTSFREE, /* Lots of free memory threshold */
CTL_VM_NEEDFREE, /* Need free memory deficit */
CTL_VM_SWAPFS_MINFREE, /* Minimum swapfs memory */
CTL_VM_SWAPFS_RESERVE, /* Reserved swapfs memory */
CTL_VM_AVAILRMEM, /* Easily available memory */
CTL_VM_FREEMEM, /* Free memory */
CTL_VM_PHYSMEM, /* Total physical memory */
#ifdef DEBUG_KMEM
CTL_KMEM_KMEMUSED, /* Alloc'd kmem bytes */
CTL_KMEM_KMEMMAX, /* Max alloc'd by kmem bytes */
CTL_KMEM_VMEMUSED, /* Alloc'd vmem bytes */
CTL_KMEM_VMEMMAX, /* Max alloc'd by vmem bytes */
CTL_KMEM_SLAB_KMEMTOTAL, /* Total kmem slab size */
CTL_KMEM_SLAB_KMEMALLOC, /* Alloc'd kmem slab size */
CTL_KMEM_SLAB_KMEMMAX, /* Max kmem slab size */
CTL_KMEM_SLAB_VMEMTOTAL, /* Total vmem slab size */
CTL_KMEM_SLAB_VMEMALLOC, /* Alloc'd vmem slab size */
CTL_KMEM_SLAB_VMEMMAX, /* Max vmem slab size */
#endif
};
#endif /* HAVE_CTL_UNNUMBERED */
#endif /* HAVE_CTL_NAME */
static int
proc_copyin_string(char *kbuffer, int kbuffer_size,
const char *ubuffer, int ubuffer_size)
{
int size;
if (ubuffer_size > kbuffer_size)
return -EOVERFLOW;
if (copy_from_user((void *)kbuffer, (void *)ubuffer, ubuffer_size))
return -EFAULT;
/* strip trailing whitespace */
size = strnlen(kbuffer, ubuffer_size);
while (size-- >= 0)
if (!isspace(kbuffer[size]))
break;
/* empty string */
if (size < 0)
return -EINVAL;
/* no space to terminate */
if (size == kbuffer_size)
return -EOVERFLOW;
kbuffer[size + 1] = 0;
return 0;
}
static int
proc_copyout_string(char *ubuffer, int ubuffer_size,
const char *kbuffer, char *append)
{
/* NB if 'append' != NULL, it's a single character to append to the
* copied out string - usually "\n", for /proc entries and
* (i.e. a terminating zero byte) for sysctl entries
*/
int size = MIN(strlen(kbuffer), ubuffer_size);
if (copy_to_user(ubuffer, kbuffer, size))
return -EFAULT;
if (append != NULL && size < ubuffer_size) {
if (copy_to_user(ubuffer + size, append, 1))
return -EFAULT;
size++;
}
return size;
}
#ifdef DEBUG_LOG
SPL_PROC_HANDLER(proc_dobitmasks)
{
unsigned long *mask = table->data;
int is_subsys = (mask == &spl_debug_subsys) ? 1 : 0;
int is_printk = (mask == &spl_debug_printk) ? 1 : 0;
int size = 512, rc;
char *str;
SENTRY;
str = kmem_alloc(size, KM_SLEEP);
if (str == NULL)
SRETURN(-ENOMEM);
if (write) {
rc = proc_copyin_string(str, size, buffer, *lenp);
if (rc < 0)
SRETURN(rc);
rc = spl_debug_str2mask(mask, str, is_subsys);
/* Always print BUG/ASSERT to console, so keep this mask */
if (is_printk)
*mask |= SD_EMERG;
*ppos += *lenp;
} else {
rc = spl_debug_mask2str(str, size, *mask, is_subsys);
if (*ppos >= rc)
rc = 0;
else
rc = proc_copyout_string(buffer, *lenp,
str + *ppos, "\n");
if (rc >= 0) {
*lenp = rc;
*ppos += rc;
}
}
kmem_free(str, size);
SRETURN(rc);
}
SPL_PROC_HANDLER(proc_debug_mb)
{
char str[32];
int rc, len;
SENTRY;
if (write) {
rc = proc_copyin_string(str, sizeof(str), buffer, *lenp);
if (rc < 0)
SRETURN(rc);
rc = spl_debug_set_mb(simple_strtoul(str, NULL, 0));
*ppos += *lenp;
} else {
len = snprintf(str, sizeof(str), "%d", spl_debug_get_mb());
if (*ppos >= len)
rc = 0;
else
rc = proc_copyout_string(buffer,*lenp,str+*ppos,"\n");
if (rc >= 0) {
*lenp = rc;
*ppos += rc;
}
}
SRETURN(rc);
}
SPL_PROC_HANDLER(proc_dump_kernel)
{
SENTRY;
if (write) {
spl_debug_dumplog(0);
*ppos += *lenp;
} else {
*lenp = 0;
}
SRETURN(0);
}
SPL_PROC_HANDLER(proc_force_bug)
{
SENTRY;
if (write)
PANIC("Crashing due to forced panic\n");
else
*lenp = 0;
SRETURN(0);
}
SPL_PROC_HANDLER(proc_console_max_delay_cs)
{
int rc, max_delay_cs;
struct ctl_table dummy = *table;
long d;
SENTRY;
dummy.data = &max_delay_cs;
dummy.proc_handler = &proc_dointvec;
if (write) {
max_delay_cs = 0;
rc = spl_proc_dointvec(&dummy,write,filp,buffer,lenp,ppos);
if (rc < 0)
SRETURN(rc);
if (max_delay_cs <= 0)
SRETURN(-EINVAL);
d = (max_delay_cs * HZ) / 100;
if (d == 0 || d < spl_console_min_delay)
SRETURN(-EINVAL);
spl_console_max_delay = d;
} else {
max_delay_cs = (spl_console_max_delay * 100) / HZ;
rc = spl_proc_dointvec(&dummy,write,filp,buffer,lenp,ppos);
}
SRETURN(rc);
}
SPL_PROC_HANDLER(proc_console_min_delay_cs)
{
int rc, min_delay_cs;
struct ctl_table dummy = *table;
long d;
SENTRY;
dummy.data = &min_delay_cs;
dummy.proc_handler = &proc_dointvec;
if (write) {
min_delay_cs = 0;
rc = spl_proc_dointvec(&dummy,write,filp,buffer,lenp,ppos);
if (rc < 0)
SRETURN(rc);
if (min_delay_cs <= 0)
SRETURN(-EINVAL);
d = (min_delay_cs * HZ) / 100;
if (d == 0 || d > spl_console_max_delay)
SRETURN(-EINVAL);
spl_console_min_delay = d;
} else {
min_delay_cs = (spl_console_min_delay * 100) / HZ;
rc = spl_proc_dointvec(&dummy,write,filp,buffer,lenp,ppos);
}
SRETURN(rc);
}
SPL_PROC_HANDLER(proc_console_backoff)
{
int rc, backoff;
struct ctl_table dummy = *table;
SENTRY;
dummy.data = &backoff;
dummy.proc_handler = &proc_dointvec;
if (write) {
backoff = 0;
rc = spl_proc_dointvec(&dummy,write,filp,buffer,lenp,ppos);
if (rc < 0)
SRETURN(rc);
if (backoff <= 0)
SRETURN(-EINVAL);
spl_console_backoff = backoff;
} else {
backoff = spl_console_backoff;
rc = spl_proc_dointvec(&dummy,write,filp,buffer,lenp,ppos);
}
SRETURN(rc);
}
#endif /* DEBUG_LOG */
#ifdef DEBUG_KMEM
SPL_PROC_HANDLER(proc_domemused)
{
int rc = 0;
unsigned long min = 0, max = ~0, val;
struct ctl_table dummy = *table;
SENTRY;
dummy.data = &val;
dummy.proc_handler = &proc_dointvec;
dummy.extra1 = &min;
dummy.extra2 = &max;
if (write) {
*ppos += *lenp;
} else {
# ifdef HAVE_ATOMIC64_T
val = atomic64_read((atomic64_t *)table->data);
# else
val = atomic_read((atomic_t *)table->data);
# endif /* HAVE_ATOMIC64_T */
rc = spl_proc_doulongvec_minmax(&dummy, write, filp,
buffer, lenp, ppos);
}
SRETURN(rc);
}
SPL_PROC_HANDLER(proc_doslab)
{
int rc = 0;
unsigned long min = 0, max = ~0, val = 0, mask;
struct ctl_table dummy = *table;
spl_kmem_cache_t *skc;
SENTRY;
dummy.data = &val;
dummy.proc_handler = &proc_dointvec;
dummy.extra1 = &min;
dummy.extra2 = &max;
if (write) {
*ppos += *lenp;
} else {
down_read(&spl_kmem_cache_sem);
mask = (unsigned long)table->data;
list_for_each_entry(skc, &spl_kmem_cache_list, skc_list) {
/* Only use slabs of the correct kmem/vmem type */
if (!(skc->skc_flags & mask))
continue;
/* Sum the specified field for selected slabs */
switch (mask & (KMC_TOTAL | KMC_ALLOC | KMC_MAX)) {
case KMC_TOTAL:
val += skc->skc_slab_size * skc->skc_slab_total;
break;
case KMC_ALLOC:
val += skc->skc_obj_size * skc->skc_obj_alloc;
break;
case KMC_MAX:
val += skc->skc_obj_size * skc->skc_obj_max;
break;
}
}
up_read(&spl_kmem_cache_sem);
rc = spl_proc_doulongvec_minmax(&dummy, write, filp,
buffer, lenp, ppos);
}
SRETURN(rc);
}
#endif /* DEBUG_KMEM */
SPL_PROC_HANDLER(proc_dohostid)
{
int len, rc = 0;
char *end, str[32];
SENTRY;
if (write) {
/* We can't use spl_proc_doulongvec_minmax() in the write
* case here because hostid while a hex value has no
* leading 0x which confuses the helper function. */
rc = proc_copyin_string(str, sizeof(str), buffer, *lenp);
if (rc < 0)
SRETURN(rc);
spl_hostid = simple_strtoul(str, &end, 16);
if (str == end)
SRETURN(-EINVAL);
(void) snprintf(hw_serial, HW_HOSTID_LEN, "%lu", spl_hostid);
hw_serial[HW_HOSTID_LEN - 1] = '\0';
*ppos += *lenp;
} else {
len = snprintf(str, sizeof(str), "%lx", spl_hostid);
if (*ppos >= len)
rc = 0;
else
rc = proc_copyout_string(buffer,*lenp,str+*ppos,"\n");
if (rc >= 0) {
*lenp = rc;
*ppos += rc;
}
}
SRETURN(rc);
}
#ifndef HAVE_KALLSYMS_LOOKUP_NAME
SPL_PROC_HANDLER(proc_dokallsyms_lookup_name)
{
int len, rc = 0;
char *end, str[32];
SENTRY;
if (write) {
/* This may only be set once at module load time */
if (spl_kallsyms_lookup_name_fn != SYMBOL_POISON)
SRETURN(-EEXIST);
/* We can't use spl_proc_doulongvec_minmax() in the write
* case here because the address while a hex value has no
* leading 0x which confuses the helper function. */
rc = proc_copyin_string(str, sizeof(str), buffer, *lenp);
if (rc < 0)
SRETURN(rc);
spl_kallsyms_lookup_name_fn =
(kallsyms_lookup_name_t)simple_strtoul(str, &end, 16);
wake_up(&spl_kallsyms_lookup_name_waitq);
if (str == end)
SRETURN(-EINVAL);
*ppos += *lenp;
} else {
len = snprintf(str, sizeof(str), "%lx",
(unsigned long)spl_kallsyms_lookup_name_fn);
if (*ppos >= len)
rc = 0;
else
rc = proc_copyout_string(buffer,*lenp,str+*ppos,"\n");
if (rc >= 0) {
*lenp = rc;
*ppos += rc;
}
}
SRETURN(rc);
}
#endif /* HAVE_KALLSYMS_LOOKUP_NAME */
SPL_PROC_HANDLER(proc_doavailrmem)
{
int len, rc = 0;
char str[32];
SENTRY;
if (write) {
*ppos += *lenp;
} else {
len = snprintf(str, sizeof(str), "%lu",
(unsigned long)availrmem);
if (*ppos >= len)
rc = 0;
else
rc = proc_copyout_string(buffer,*lenp,str+*ppos,"\n");
if (rc >= 0) {
*lenp = rc;
*ppos += rc;
}
}
SRETURN(rc);
}
SPL_PROC_HANDLER(proc_dofreemem)
{
int len, rc = 0;
char str[32];
SENTRY;
if (write) {
*ppos += *lenp;
} else {
len = snprintf(str, sizeof(str), "%lu", (unsigned long)freemem);
if (*ppos >= len)
rc = 0;
else
rc = proc_copyout_string(buffer,*lenp,str+*ppos,"\n");
if (rc >= 0) {
*lenp = rc;
*ppos += rc;
}
}
SRETURN(rc);
}
#ifdef DEBUG_KMEM
static void
slab_seq_show_headers(struct seq_file *f)
{
seq_printf(f,
"--------------------- cache ----------"
"--------------------------------------------- "
"----- slab ------ "
"---- object ----- "
"--- emergency ---\n");
seq_printf(f,
"name "
" flags size alloc slabsize objsize "
"total alloc max "
"total alloc max "
"dlock alloc max\n");
}
static int
slab_seq_show(struct seq_file *f, void *p)
{
spl_kmem_cache_t *skc = p;
ASSERT(skc->skc_magic == SKC_MAGIC);
spin_lock(&skc->skc_lock);
seq_printf(f, "%-36s ", skc->skc_name);
seq_printf(f, "0x%05lx %9lu %9lu %8u %8u "
"%5lu %5lu %5lu %5lu %5lu %5lu %5lu %5lu %5lu\n",
(long unsigned)skc->skc_flags,
(long unsigned)(skc->skc_slab_size * skc->skc_slab_total),
(long unsigned)(skc->skc_obj_size * skc->skc_obj_alloc),
(unsigned)skc->skc_slab_size,
(unsigned)skc->skc_obj_size,
(long unsigned)skc->skc_slab_total,
(long unsigned)skc->skc_slab_alloc,
(long unsigned)skc->skc_slab_max,
(long unsigned)skc->skc_obj_total,
(long unsigned)skc->skc_obj_alloc,
(long unsigned)skc->skc_obj_max,
(long unsigned)skc->skc_obj_deadlock,
(long unsigned)skc->skc_obj_emergency,
(long unsigned)skc->skc_obj_emergency_max);
spin_unlock(&skc->skc_lock);
return 0;
}
static void *
slab_seq_start(struct seq_file *f, loff_t *pos)
{
struct list_head *p;
loff_t n = *pos;
SENTRY;
down_read(&spl_kmem_cache_sem);
if (!n)
slab_seq_show_headers(f);
p = spl_kmem_cache_list.next;
while (n--) {
p = p->next;
if (p == &spl_kmem_cache_list)
SRETURN(NULL);
}
SRETURN(list_entry(p, spl_kmem_cache_t, skc_list));
}
static void *
slab_seq_next(struct seq_file *f, void *p, loff_t *pos)
{
spl_kmem_cache_t *skc = p;
SENTRY;
++*pos;
SRETURN((skc->skc_list.next == &spl_kmem_cache_list) ?
NULL : list_entry(skc->skc_list.next,spl_kmem_cache_t,skc_list));
}
static void
slab_seq_stop(struct seq_file *f, void *v)
{
up_read(&spl_kmem_cache_sem);
}
static struct seq_operations slab_seq_ops = {
.show = slab_seq_show,
.start = slab_seq_start,
.next = slab_seq_next,
.stop = slab_seq_stop,
};
static int
proc_slab_open(struct inode *inode, struct file *filp)
{
return seq_open(filp, &slab_seq_ops);
}
static struct file_operations proc_slab_operations = {
.open = proc_slab_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
#endif /* DEBUG_KMEM */
#ifdef DEBUG_LOG
static struct ctl_table spl_debug_table[] = {
{
CTL_NAME (CTL_DEBUG_SUBSYS)
.procname = "subsystem",
.data = &spl_debug_subsys,
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = &proc_dobitmasks
},
{
CTL_NAME (CTL_DEBUG_MASK)
.procname = "mask",
.data = &spl_debug_mask,
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = &proc_dobitmasks
},
{
CTL_NAME (CTL_DEBUG_PRINTK)
.procname = "printk",
.data = &spl_debug_printk,
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = &proc_dobitmasks
},
{
CTL_NAME (CTL_DEBUG_MB)
.procname = "mb",
.mode = 0644,
.proc_handler = &proc_debug_mb,
},
{
CTL_NAME (CTL_DEBUG_BINARY)
.procname = "binary",
.data = &spl_debug_binary,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
CTL_NAME (CTL_DEBUG_CATASTROPHE)
.procname = "catastrophe",
.data = &spl_debug_catastrophe,
.maxlen = sizeof(int),
.mode = 0444,
.proc_handler = &proc_dointvec,
},
{
CTL_NAME (CTL_DEBUG_PANIC_ON_BUG)
.procname = "panic_on_bug",
.data = &spl_debug_panic_on_bug,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
},
{
CTL_NAME (CTL_DEBUG_PATH)
.procname = "path",
.data = spl_debug_file_path,
.maxlen = sizeof(spl_debug_file_path),
.mode = 0644,
.proc_handler = &proc_dostring,
},
{
CTL_NAME (CTL_DEBUG_DUMP)
.procname = "dump",
.mode = 0200,
.proc_handler = &proc_dump_kernel,
},
{ CTL_NAME (CTL_DEBUG_FORCE_BUG)
.procname = "force_bug",
.mode = 0200,
.proc_handler = &proc_force_bug,
},
{
CTL_NAME (CTL_CONSOLE_RATELIMIT)
.procname = "console_ratelimit",
.data = &spl_console_ratelimit,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
CTL_NAME (CTL_CONSOLE_MAX_DELAY_CS)
.procname = "console_max_delay_centisecs",
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_console_max_delay_cs,
},
{
CTL_NAME (CTL_CONSOLE_MIN_DELAY_CS)
.procname = "console_min_delay_centisecs",
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_console_min_delay_cs,
},
{
CTL_NAME (CTL_CONSOLE_BACKOFF)
.procname = "console_backoff",
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_console_backoff,
},
{
CTL_NAME (CTL_DEBUG_STACK_SIZE)
.procname = "stack_max",
.data = &spl_debug_stack,
.maxlen = sizeof(int),
.mode = 0444,
.proc_handler = &proc_dointvec,
},
{0},
};
#endif /* DEBUG_LOG */
static struct ctl_table spl_vm_table[] = {
{
CTL_NAME (CTL_VM_MINFREE)
.procname = "minfree",
.data = &minfree,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
CTL_NAME (CTL_VM_DESFREE)
.procname = "desfree",
.data = &desfree,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
CTL_NAME (CTL_VM_LOTSFREE)
.procname = "lotsfree",
.data = &lotsfree,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
CTL_NAME (CTL_VM_NEEDFREE)
.procname = "needfree",
.data = &needfree,
.maxlen = sizeof(int),
.mode = 0444,
.proc_handler = &proc_dointvec,
},
{
CTL_NAME (CTL_VM_SWAPFS_MINFREE)
.procname = "swapfs_minfree",
.data = &swapfs_minfree,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
CTL_NAME (CTL_VM_SWAPFS_RESERVE)
.procname = "swapfs_reserve",
.data = &swapfs_reserve,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
CTL_NAME (CTL_VM_AVAILRMEM)
.procname = "availrmem",
.mode = 0444,
.proc_handler = &proc_doavailrmem,
},
{
CTL_NAME (CTL_VM_FREEMEM)
.procname = "freemem",
.data = (void *)2,
.maxlen = sizeof(int),
.mode = 0444,
.proc_handler = &proc_dofreemem,
},
{
CTL_NAME (CTL_VM_PHYSMEM)
.procname = "physmem",
.data = &physmem,
.maxlen = sizeof(int),
.mode = 0444,
.proc_handler = &proc_dointvec,
},
{0},
};
#ifdef DEBUG_KMEM
static struct ctl_table spl_kmem_table[] = {
{
CTL_NAME (CTL_KMEM_KMEMUSED)
.procname = "kmem_used",
.data = &kmem_alloc_used,
# ifdef HAVE_ATOMIC64_T
.maxlen = sizeof(atomic64_t),
# else
.maxlen = sizeof(atomic_t),
# endif /* HAVE_ATOMIC64_T */
.mode = 0444,
.proc_handler = &proc_domemused,
},
{
CTL_NAME (CTL_KMEM_KMEMMAX)
.procname = "kmem_max",
.data = &kmem_alloc_max,
.maxlen = sizeof(unsigned long),
.extra1 = &table_min,
.extra2 = &table_max,
.mode = 0444,
.proc_handler = &proc_doulongvec_minmax,
},
{
CTL_NAME (CTL_KMEM_VMEMUSED)
.procname = "vmem_used",
.data = &vmem_alloc_used,
# ifdef HAVE_ATOMIC64_T
.maxlen = sizeof(atomic64_t),
# else
.maxlen = sizeof(atomic_t),
# endif /* HAVE_ATOMIC64_T */
.mode = 0444,
.proc_handler = &proc_domemused,
},
{
CTL_NAME (CTL_KMEM_VMEMMAX)
.procname = "vmem_max",
.data = &vmem_alloc_max,
.maxlen = sizeof(unsigned long),
.extra1 = &table_min,
.extra2 = &table_max,
.mode = 0444,
.proc_handler = &proc_doulongvec_minmax,
},
{
CTL_NAME (CTL_KMEM_SLAB_KMEMTOTAL)
.procname = "slab_kmem_total",
.data = (void *)(KMC_KMEM | KMC_TOTAL),
.maxlen = sizeof(unsigned long),
.extra1 = &table_min,
.extra2 = &table_max,
.mode = 0444,
.proc_handler = &proc_doslab,
},
{
CTL_NAME (CTL_KMEM_SLAB_KMEMALLOC)
.procname = "slab_kmem_alloc",
.data = (void *)(KMC_KMEM | KMC_ALLOC),
.maxlen = sizeof(unsigned long),
.extra1 = &table_min,
.extra2 = &table_max,
.mode = 0444,
.proc_handler = &proc_doslab,
},
{
CTL_NAME (CTL_KMEM_SLAB_KMEMMAX)
.procname = "slab_kmem_max",
.data = (void *)(KMC_KMEM | KMC_MAX),
.maxlen = sizeof(unsigned long),
.extra1 = &table_min,
.extra2 = &table_max,
.mode = 0444,
.proc_handler = &proc_doslab,
},
{
CTL_NAME (CTL_KMEM_SLAB_VMEMTOTAL)
.procname = "slab_vmem_total",
.data = (void *)(KMC_VMEM | KMC_TOTAL),
.maxlen = sizeof(unsigned long),
.extra1 = &table_min,
.extra2 = &table_max,
.mode = 0444,
.proc_handler = &proc_doslab,
},
{
CTL_NAME (CTL_KMEM_SLAB_VMEMALLOC)
.procname = "slab_vmem_alloc",
.data = (void *)(KMC_VMEM | KMC_ALLOC),
.maxlen = sizeof(unsigned long),
.extra1 = &table_min,
.extra2 = &table_max,
.mode = 0444,
.proc_handler = &proc_doslab,
},
{
CTL_NAME (CTL_KMEM_SLAB_VMEMMAX)
.procname = "slab_vmem_max",
.data = (void *)(KMC_VMEM | KMC_MAX),
.maxlen = sizeof(unsigned long),
.extra1 = &table_min,
.extra2 = &table_max,
.mode = 0444,
.proc_handler = &proc_doslab,
},
{0},
};
#endif /* DEBUG_KMEM */
static struct ctl_table spl_kstat_table[] = {
{0},
};
static struct ctl_table spl_table[] = {
/* NB No .strategy entries have been provided since
* sysctl(8) prefers to go via /proc for portability.
*/
{
CTL_NAME (CTL_VERSION)
.procname = "version",
.data = spl_version,
.maxlen = sizeof(spl_version),
.mode = 0444,
.proc_handler = &proc_dostring,
},
{
CTL_NAME (CTL_HOSTID)
.procname = "hostid",
.data = &spl_hostid,
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = &proc_dohostid,
},
{
CTL_NAME (CTL_HW_SERIAL)
.procname = "hw_serial",
.data = hw_serial,
.maxlen = sizeof(hw_serial),
.mode = 0444,
.proc_handler = &proc_dostring,
},
#ifndef HAVE_KALLSYMS_LOOKUP_NAME
{
CTL_NAME (CTL_KALLSYMS)
.procname = "kallsyms_lookup_name",
.data = &spl_kallsyms_lookup_name_fn,
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = &proc_dokallsyms_lookup_name,
},
#endif
#ifdef DEBUG_LOG
{
CTL_NAME (CTL_SPL_DEBUG)
.procname = "debug",
.mode = 0555,
.child = spl_debug_table,
},
#endif
{
CTL_NAME (CTL_SPL_VM)
.procname = "vm",
.mode = 0555,
.child = spl_vm_table,
},
#ifdef DEBUG_KMEM
{
CTL_NAME (CTL_SPL_KMEM)
.procname = "kmem",
.mode = 0555,
.child = spl_kmem_table,
},
#endif
{
CTL_NAME (CTL_SPL_KSTAT)
.procname = "kstat",
.mode = 0555,
.child = spl_kstat_table,
},
{ 0 },
};
static struct ctl_table spl_dir[] = {
{
CTL_NAME (CTL_SPL)
.procname = "spl",
.mode = 0555,
.child = spl_table,
},
{ 0 }
};
static struct ctl_table spl_root[] = {
{
CTL_NAME (CTL_KERN)
.procname = "kernel",
.mode = 0555,
.child = spl_dir,
},
{ 0 }
};
static int
proc_dir_entry_match(int len, const char *name, struct proc_dir_entry *de)
{
if (de->namelen != len)
return 0;
return !memcmp(name, de->name, len);
}
struct proc_dir_entry *
proc_dir_entry_find(struct proc_dir_entry *root, const char *str)
{
struct proc_dir_entry *de;
for (de = root->subdir; de; de = de->next)
if (proc_dir_entry_match(strlen(str), str, de))
return de;
return NULL;
}
int
proc_dir_entries(struct proc_dir_entry *root)
{
struct proc_dir_entry *de;
int i = 0;
for (de = root->subdir; de; de = de->next)
i++;
return i;
}
int
spl_proc_init(void)
{
int rc = 0;
SENTRY;
#ifdef CONFIG_SYSCTL
spl_header = spl_register_sysctl_table(spl_root, 0);
if (spl_header == NULL)
SRETURN(-EUNATCH);
#endif /* CONFIG_SYSCTL */
proc_spl = proc_mkdir("spl", NULL);
if (proc_spl == NULL)
SGOTO(out, rc = -EUNATCH);
#ifdef DEBUG_KMEM
proc_spl_kmem = proc_mkdir("kmem", proc_spl);
if (proc_spl_kmem == NULL)
SGOTO(out, rc = -EUNATCH);
proc_spl_kmem_slab = create_proc_entry("slab", 0444, proc_spl_kmem);
if (proc_spl_kmem_slab == NULL)
SGOTO(out, rc = -EUNATCH);
proc_spl_kmem_slab->proc_fops = &proc_slab_operations;
#endif /* DEBUG_KMEM */
proc_spl_kstat = proc_mkdir("kstat", proc_spl);
if (proc_spl_kstat == NULL)
SGOTO(out, rc = -EUNATCH);
out:
if (rc) {
remove_proc_entry("kstat", proc_spl);
#ifdef DEBUG_KMEM
remove_proc_entry("slab", proc_spl_kmem);
remove_proc_entry("kmem", proc_spl);
#endif
remove_proc_entry("spl", NULL);
#ifdef CONFIG_SYSCTL
spl_unregister_sysctl_table(spl_header);
#endif /* CONFIG_SYSCTL */
}
SRETURN(rc);
}
void
spl_proc_fini(void)
{
SENTRY;
remove_proc_entry("kstat", proc_spl);
#ifdef DEBUG_KMEM
remove_proc_entry("slab", proc_spl_kmem);
remove_proc_entry("kmem", proc_spl);
#endif
remove_proc_entry("spl", NULL);
#ifdef CONFIG_SYSCTL
ASSERT(spl_header != NULL);
spl_unregister_sysctl_table(spl_header);
#endif /* CONFIG_SYSCTL */
SEXIT;
}
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