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mirror_zfs/module/spl/spl-proc.c
Brian Behlendorf e5b9b344c7 Refactor existing code 
This change introduces no functional changes to the memory management
interfaces.  It only restructures the existing codes by separating the
kmem, vmem, and kmem cache implementations in the separate source and
header files.

Splitting this functionality in to separate files required the addition
of spl_vmem_{init,fini}() and spl_kmem_cache_{initi,fini}() functions.

Additionally, several minor changes to the #include's were required to
accommodate the removal of extraneous header from kmem.h.

But again, while large this patch introduces no functional changes.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2015-01-16 13:55:08 -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://zfsonlinux.org/>.
*
* 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 <sys/kmem.h>
#include <sys/kmem_cache.h>
#include <sys/vmem.h>
#include <linux/ctype.h>
#include <linux/kmod.h>
#include <linux/seq_file.h>
#include <linux/proc_compat.h>
#include <linux/uaccess.h>
#include <linux/version.h>
#if defined(CONSTIFY_PLUGIN) && LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)
typedef struct ctl_table __no_const spl_ctl_table;
#else
typedef struct ctl_table spl_ctl_table;
#endif
#ifdef DEBUG_KMEM
static unsigned long table_min = 0;
static unsigned long table_max = ~0;
#endif
static struct ctl_table_header *spl_header = NULL;
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;
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_KMEM
static int
proc_domemused(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int rc = 0;
unsigned long min = 0, max = ~0, val;
spl_ctl_table dummy = *table;
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 = proc_doulongvec_minmax(&dummy, write, buffer, lenp, ppos);
}
return (rc);
}
static int
proc_doslab(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int rc = 0;
unsigned long min = 0, max = ~0, val = 0, mask;
spl_ctl_table dummy = *table;
spl_kmem_cache_t *skc;
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 = proc_doulongvec_minmax(&dummy, write, buffer, lenp, ppos);
}
return (rc);
}
#endif /* DEBUG_KMEM */
static int
proc_dohostid(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int len, rc = 0;
char *end, str[32];
if (write) {
/* We can't use 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)
return (rc);
spl_hostid = simple_strtoul(str, &end, 16);
if (str == end)
return (-EINVAL);
} 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;
}
}
return (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);
/*
* Backed by Linux slab see /proc/slabinfo.
*/
if (skc->skc_flags & KMC_SLAB)
return (0);
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;
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)
return (NULL);
}
return (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;
++*pos;
return ((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_KMEM
static struct ctl_table spl_kmem_table[] = {
{
.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,
},
{
.procname = "kmem_max",
.data = &kmem_alloc_max,
.maxlen = sizeof(unsigned long),
.extra1 = &table_min,
.extra2 = &table_max,
.mode = 0444,
.proc_handler = &proc_doulongvec_minmax,
},
{
.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,
},
{
.procname = "vmem_max",
.data = &vmem_alloc_max,
.maxlen = sizeof(unsigned long),
.extra1 = &table_min,
.extra2 = &table_max,
.mode = 0444,
.proc_handler = &proc_doulongvec_minmax,
},
{
.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,
},
{
.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,
},
{
.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,
},
{
.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,
},
{
.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,
},
{
.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.
*/
{
.procname = "version",
.data = spl_version,
.maxlen = sizeof(spl_version),
.mode = 0444,
.proc_handler = &proc_dostring,
},
{
.procname = "hostid",
.data = &spl_hostid,
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = &proc_dohostid,
},
#ifdef DEBUG_KMEM
{
.procname = "kmem",
.mode = 0555,
.child = spl_kmem_table,
},
#endif
{
.procname = "kstat",
.mode = 0555,
.child = spl_kstat_table,
},
{ 0 },
};
static struct ctl_table spl_dir[] = {
{
.procname = "spl",
.mode = 0555,
.child = spl_table,
},
{ 0 }
};
static struct ctl_table spl_root[] = {
{
#ifdef HAVE_CTL_NAME
.ctl_name = CTL_KERN,
#endif
.procname = "kernel",
.mode = 0555,
.child = spl_dir,
},
{ 0 }
};
int
spl_proc_init(void)
{
int rc = 0;
spl_header = register_sysctl_table(spl_root);
if (spl_header == NULL)
return (-EUNATCH);
proc_spl = proc_mkdir("spl", NULL);
if (proc_spl == NULL) {
rc = -EUNATCH;
goto out;
}
#ifdef DEBUG_KMEM
proc_spl_kmem = proc_mkdir("kmem", proc_spl);
if (proc_spl_kmem == NULL) {
rc = -EUNATCH;
goto out;
}
proc_spl_kmem_slab = proc_create_data("slab", 0444,
proc_spl_kmem, &proc_slab_operations, NULL);
if (proc_spl_kmem_slab == NULL) {
rc = -EUNATCH;
goto out;
}
#endif /* DEBUG_KMEM */
proc_spl_kstat = proc_mkdir("kstat", proc_spl);
if (proc_spl_kstat == NULL) {
rc = -EUNATCH;
goto out;
}
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);
unregister_sysctl_table(spl_header);
}
return (rc);
}
void
spl_proc_fini(void)
{
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);
ASSERT(spl_header != NULL);
unregister_sysctl_table(spl_header);
}
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