-/*
- * This file is part of the SPL: Solaris Porting Layer.
- *
- * Copyright (c) 2008 Lawrence Livermore National Security, LLC.
- * Produced at Lawrence Livermore National Laboratory
- * Written by:
- * Brian Behlendorf <behlendorf1@llnl.gov>,
- * Herb Wartens <wartens2@llnl.gov>,
- * Jim Garlick <garlick@llnl.gov>
+/*****************************************************************************\
+ * 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 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.
+ * 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.
*
- * This is distributed in the hope that it will be useful, but WITHOUT
+ * 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 this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
+ * with the SPL. If not, see <http://www.gnu.org/licenses/>.
+ *****************************************************************************
+ * Solaris Porting Layer (SPL) Kstat Implementation.
+\*****************************************************************************/
+#include <linux/seq_file.h>
#include <sys/kstat.h>
+#include <sys/vmem.h>
+#include <sys/cmn_err.h>
-#ifdef DEBUG_KSTAT
+#ifndef HAVE_PDE_DATA
+#define PDE_DATA(x) (PDE(x)->data)
+#endif
-static spinlock_t kstat_lock;
-static struct list_head kstat_list;
+static kmutex_t kstat_module_lock;
+static struct list_head kstat_module_list;
static kid_t kstat_id;
-static void
+static int
+kstat_resize_raw(kstat_t *ksp)
+{
+ if (ksp->ks_raw_bufsize == KSTAT_RAW_MAX)
+ return ENOMEM;
+
+ vmem_free(ksp->ks_raw_buf, ksp->ks_raw_bufsize);
+ ksp->ks_raw_bufsize = MIN(ksp->ks_raw_bufsize * 2, KSTAT_RAW_MAX);
+ ksp->ks_raw_buf = vmem_alloc(ksp->ks_raw_bufsize, KM_SLEEP);
+
+ return 0;
+}
+
+void
+kstat_waitq_enter(kstat_io_t *kiop)
+{
+ hrtime_t new, delta;
+ ulong_t wcnt;
+
+ new = gethrtime();
+ delta = new - kiop->wlastupdate;
+ kiop->wlastupdate = new;
+ wcnt = kiop->wcnt++;
+ if (wcnt != 0) {
+ kiop->wlentime += delta * wcnt;
+ kiop->wtime += delta;
+ }
+}
+EXPORT_SYMBOL(kstat_waitq_enter);
+
+void
+kstat_waitq_exit(kstat_io_t *kiop)
+{
+ hrtime_t new, delta;
+ ulong_t wcnt;
+
+ new = gethrtime();
+ delta = new - kiop->wlastupdate;
+ kiop->wlastupdate = new;
+ wcnt = kiop->wcnt--;
+ ASSERT((int)wcnt > 0);
+ kiop->wlentime += delta * wcnt;
+ kiop->wtime += delta;
+}
+EXPORT_SYMBOL(kstat_waitq_exit);
+
+void
+kstat_runq_enter(kstat_io_t *kiop)
+{
+ hrtime_t new, delta;
+ ulong_t rcnt;
+
+ new = gethrtime();
+ delta = new - kiop->rlastupdate;
+ kiop->rlastupdate = new;
+ rcnt = kiop->rcnt++;
+ if (rcnt != 0) {
+ kiop->rlentime += delta * rcnt;
+ kiop->rtime += delta;
+ }
+}
+EXPORT_SYMBOL(kstat_runq_enter);
+
+void
+kstat_runq_exit(kstat_io_t *kiop)
+{
+ hrtime_t new, delta;
+ ulong_t rcnt;
+
+ new = gethrtime();
+ delta = new - kiop->rlastupdate;
+ kiop->rlastupdate = new;
+ rcnt = kiop->rcnt--;
+ ASSERT((int)rcnt > 0);
+ kiop->rlentime += delta * rcnt;
+ kiop->rtime += delta;
+}
+EXPORT_SYMBOL(kstat_runq_exit);
+
+static int
kstat_seq_show_headers(struct seq_file *f)
{
kstat_t *ksp = (kstat_t *)f->private;
+ int rc = 0;
+
ASSERT(ksp->ks_magic == KS_MAGIC);
seq_printf(f, "%d %d 0x%02x %d %d %lld %lld\n",
switch (ksp->ks_type) {
case KSTAT_TYPE_RAW:
- seq_printf(f, "raw data");
+restart:
+ if (ksp->ks_raw_ops.headers) {
+ rc = ksp->ks_raw_ops.headers(
+ ksp->ks_raw_buf, ksp->ks_raw_bufsize);
+ if (rc == ENOMEM && !kstat_resize_raw(ksp))
+ goto restart;
+ if (!rc)
+ seq_puts(f, ksp->ks_raw_buf);
+ } else {
+ seq_printf(f, "raw data\n");
+ }
break;
case KSTAT_TYPE_NAMED:
seq_printf(f, "%-31s %-4s %s\n",
"min", "max", "start", "stop");
break;
default:
- SBUG(); /* Unreachable */
+ PANIC("Undefined kstat type %d\n", ksp->ks_type);
}
+
+ return -rc;
}
static int
seq_printf(f, "%s", KSTAT_NAMED_STR_PTR(knp));
break;
default:
- SBUG(); /* Unreachable */
+ PANIC("Undefined kstat data type %d\n", knp->data_type);
}
seq_printf(f, "\n");
switch (ksp->ks_type) {
case KSTAT_TYPE_RAW:
- ASSERT(ksp->ks_ndata == 1);
- rc = kstat_seq_show_raw(f, ksp->ks_data,
- ksp->ks_data_size);
+restart:
+ if (ksp->ks_raw_ops.data) {
+ rc = ksp->ks_raw_ops.data(
+ ksp->ks_raw_buf, ksp->ks_raw_bufsize, p);
+ if (rc == ENOMEM && !kstat_resize_raw(ksp))
+ goto restart;
+ if (!rc)
+ seq_puts(f, ksp->ks_raw_buf);
+ } else {
+ ASSERT(ksp->ks_ndata == 1);
+ rc = kstat_seq_show_raw(f, ksp->ks_data,
+ ksp->ks_data_size);
+ }
break;
case KSTAT_TYPE_NAMED:
rc = kstat_seq_show_named(f, (kstat_named_t *)p);
rc = kstat_seq_show_timer(f, (kstat_timer_t *)p);
break;
default:
- SBUG(); /* Unreachable */
+ PANIC("Undefined kstat type %d\n", ksp->ks_type);
}
- return rc;
+ return -rc;
+}
+
+int
+kstat_default_update(kstat_t *ksp, int rw)
+{
+ ASSERT(ksp != NULL);
+
+ if (rw == KSTAT_WRITE)
+ return (EACCES);
+
+ return 0;
}
static void *
kstat_seq_data_addr(kstat_t *ksp, loff_t n)
{
void *rc = NULL;
- ENTRY;
switch (ksp->ks_type) {
case KSTAT_TYPE_RAW:
- rc = ksp->ks_data;
+ if (ksp->ks_raw_ops.addr)
+ rc = ksp->ks_raw_ops.addr(ksp, n);
+ else
+ rc = ksp->ks_data;
break;
case KSTAT_TYPE_NAMED:
rc = ksp->ks_data + n * sizeof(kstat_named_t);
rc = ksp->ks_data + n * sizeof(kstat_timer_t);
break;
default:
- SBUG(); /* Unreachable */
+ PANIC("Undefined kstat type %d\n", ksp->ks_type);
}
- RETURN(rc);
+ return (rc);
}
static void *
loff_t n = *pos;
kstat_t *ksp = (kstat_t *)f->private;
ASSERT(ksp->ks_magic == KS_MAGIC);
- ENTRY;
- spin_lock(&ksp->ks_lock);
+ mutex_enter(ksp->ks_lock);
+
+ if (ksp->ks_type == KSTAT_TYPE_RAW) {
+ ksp->ks_raw_bufsize = PAGE_SIZE;
+ ksp->ks_raw_buf = vmem_alloc(ksp->ks_raw_bufsize, KM_SLEEP);
+ }
+
+ /* Dynamically update kstat, on error existing kstats are used */
+ (void) ksp->ks_update(ksp, KSTAT_READ);
+
ksp->ks_snaptime = gethrtime();
- if (!n)
- kstat_seq_show_headers(f);
+ if (!n && kstat_seq_show_headers(f))
+ return (NULL);
if (n >= ksp->ks_ndata)
- RETURN(NULL);
+ return (NULL);
- RETURN(kstat_seq_data_addr(ksp, n));
+ return (kstat_seq_data_addr(ksp, n));
}
static void *
{
kstat_t *ksp = (kstat_t *)f->private;
ASSERT(ksp->ks_magic == KS_MAGIC);
- ENTRY;
++*pos;
if (*pos >= ksp->ks_ndata)
- RETURN(NULL);
+ return (NULL);
- RETURN(kstat_seq_data_addr(ksp, *pos));
+ return (kstat_seq_data_addr(ksp, *pos));
}
static void
kstat_seq_stop(struct seq_file *f, void *v)
{
- kstat_t *ksp = (kstat_t *)f->private;
- ASSERT(ksp->ks_magic == KS_MAGIC);
+ kstat_t *ksp = (kstat_t *)f->private;
+ ASSERT(ksp->ks_magic == KS_MAGIC);
- spin_unlock(&ksp->ks_lock);
+ if (ksp->ks_type == KSTAT_TYPE_RAW)
+ vmem_free(ksp->ks_raw_buf, ksp->ks_raw_bufsize);
+
+ mutex_exit(ksp->ks_lock);
}
static struct seq_operations kstat_seq_ops = {
.stop = kstat_seq_stop,
};
+static kstat_module_t *
+kstat_find_module(char *name)
+{
+ kstat_module_t *module;
+
+ list_for_each_entry(module, &kstat_module_list, ksm_module_list)
+ if (strncmp(name, module->ksm_name, KSTAT_STRLEN) == 0)
+ return (module);
+
+ return (NULL);
+}
+
+static kstat_module_t *
+kstat_create_module(char *name)
+{
+ kstat_module_t *module;
+ struct proc_dir_entry *pde;
+
+ pde = proc_mkdir(name, proc_spl_kstat);
+ if (pde == NULL)
+ return (NULL);
+
+ module = kmem_alloc(sizeof (kstat_module_t), KM_SLEEP);
+ module->ksm_proc = pde;
+ strlcpy(module->ksm_name, name, KSTAT_STRLEN+1);
+ INIT_LIST_HEAD(&module->ksm_kstat_list);
+ list_add_tail(&module->ksm_module_list, &kstat_module_list);
+
+ return (module);
+
+}
+
+static void
+kstat_delete_module(kstat_module_t *module)
+{
+ ASSERT(list_empty(&module->ksm_kstat_list));
+ remove_proc_entry(module->ksm_name, proc_spl_kstat);
+ list_del(&module->ksm_module_list);
+ kmem_free(module, sizeof(kstat_module_t));
+}
+
static int
proc_kstat_open(struct inode *inode, struct file *filp)
{
return rc;
f = filp->private_data;
- f->private = PDE(inode)->data;
+ f->private = PDE_DATA(inode);
return rc;
}
+static ssize_t
+proc_kstat_write(struct file *filp, const char __user *buf,
+ size_t len, loff_t *ppos)
+{
+ struct seq_file *f = filp->private_data;
+ kstat_t *ksp = f->private;
+ int rc;
+
+ ASSERT(ksp->ks_magic == KS_MAGIC);
+
+ mutex_enter(ksp->ks_lock);
+ rc = ksp->ks_update(ksp, KSTAT_WRITE);
+ mutex_exit(ksp->ks_lock);
+
+ if (rc)
+ return (-rc);
+
+ *ppos += len;
+ return (len);
+}
+
static struct file_operations proc_kstat_operations = {
- .open = proc_kstat_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
+ .open = proc_kstat_open,
+ .write = proc_kstat_write,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
};
+void
+__kstat_set_raw_ops(kstat_t *ksp,
+ int (*headers)(char *buf, size_t size),
+ int (*data)(char *buf, size_t size, void *data),
+ void *(*addr)(kstat_t *ksp, loff_t index))
+{
+ ksp->ks_raw_ops.headers = headers;
+ ksp->ks_raw_ops.data = data;
+ ksp->ks_raw_ops.addr = addr;
+}
+EXPORT_SYMBOL(__kstat_set_raw_ops);
+
kstat_t *
__kstat_create(const char *ks_module, int ks_instance, const char *ks_name,
const char *ks_class, uchar_t ks_type, uint_t ks_ndata,
if (ksp == NULL)
return ksp;
- spin_lock(&kstat_lock);
+ mutex_enter(&kstat_module_lock);
ksp->ks_kid = kstat_id;
kstat_id++;
- spin_unlock(&kstat_lock);
+ mutex_exit(&kstat_module_lock);
ksp->ks_magic = KS_MAGIC;
- spin_lock_init(&ksp->ks_lock);
+ mutex_init(&ksp->ks_private_lock, NULL, MUTEX_DEFAULT, NULL);
+ ksp->ks_lock = &ksp->ks_private_lock;
INIT_LIST_HEAD(&ksp->ks_list);
ksp->ks_crtime = gethrtime();
strncpy(ksp->ks_class, ks_class, KSTAT_STRLEN);
ksp->ks_type = ks_type;
ksp->ks_flags = ks_flags;
+ ksp->ks_update = kstat_default_update;
+ ksp->ks_private = NULL;
+ ksp->ks_raw_ops.headers = NULL;
+ ksp->ks_raw_ops.data = NULL;
+ ksp->ks_raw_ops.addr = NULL;
+ ksp->ks_raw_buf = NULL;
+ ksp->ks_raw_bufsize = 0;
switch (ksp->ks_type) {
case KSTAT_TYPE_RAW:
ksp->ks_data_size = ks_ndata * sizeof(kstat_timer_t);
break;
default:
- SBUG(); /* Unreachable */
+ PANIC("Undefined kstat type %d\n", ksp->ks_type);
}
if (ksp->ks_flags & KSTAT_FLAG_VIRTUAL) {
ksp->ks_data = NULL;
} else {
- ksp->ks_data = kmem_alloc(ksp->ks_data_size, KM_SLEEP);
+ ksp->ks_data = kmem_zalloc(ksp->ks_data_size, KM_SLEEP);
if (ksp->ks_data == NULL) {
kmem_free(ksp, sizeof(*ksp));
ksp = NULL;
}
EXPORT_SYMBOL(__kstat_create);
-void
-__kstat_install(kstat_t *ksp)
+static int
+kstat_detect_collision(kstat_t *ksp)
{
- struct proc_dir_entry *de_module, *de_name;
+ kstat_module_t *module;
kstat_t *tmp;
- int rc = 0;
- ENTRY;
+ char parent[KSTAT_STRLEN+1];
+ char *cp;
- spin_lock(&kstat_lock);
+ (void) strlcpy(parent, ksp->ks_module, sizeof(parent));
- /* Item may only be added to the list once */
- list_for_each_entry(tmp, &kstat_list, ks_list) {
- if (tmp == ksp) {
- spin_unlock(&kstat_lock);
- GOTO(out, rc = -EEXIST);
- }
+ if ((cp = strrchr(parent, '/')) == NULL)
+ return (0);
+
+ cp[0] = '\0';
+ if ((module = kstat_find_module(parent)) != NULL) {
+ list_for_each_entry(tmp, &module->ksm_kstat_list, ks_list)
+ if (strncmp(tmp->ks_name, cp+1, KSTAT_STRLEN) == 0)
+ return (EEXIST);
}
- list_add_tail(&ksp->ks_list, &kstat_list);
- spin_unlock(&kstat_lock);
+ return (0);
+}
- de_module = proc_dir_entry_find(proc_spl_kstat, ksp->ks_module);
- if (de_module == NULL) {
- de_module = proc_mkdir(ksp->ks_module, proc_spl_kstat);
- if (de_module == NULL)
- GOTO(out, rc = -EUNATCH);
- }
+void
+__kstat_install(kstat_t *ksp)
+{
+ kstat_module_t *module;
+ kstat_t *tmp;
- de_name = create_proc_entry(ksp->ks_name, 0444, de_module);
- if (de_name == NULL)
- GOTO(out, rc = -EUNATCH);
+ ASSERT(ksp);
- spin_lock(&ksp->ks_lock);
- ksp->ks_proc = de_name;
- de_name->proc_fops = &proc_kstat_operations;
- de_name->data = (void *)ksp;
- spin_unlock(&ksp->ks_lock);
-out:
- if (rc) {
- spin_lock(&kstat_lock);
- list_del_init(&ksp->ks_list);
- spin_unlock(&kstat_lock);
+ mutex_enter(&kstat_module_lock);
+
+ module = kstat_find_module(ksp->ks_module);
+ if (module == NULL) {
+ if (kstat_detect_collision(ksp) != 0) {
+ cmn_err(CE_WARN, "kstat_create('%s', '%s'): namespace" \
+ " collision", ksp->ks_module, ksp->ks_name);
+ goto out;
+ }
+ module = kstat_create_module(ksp->ks_module);
+ if (module == NULL)
+ goto out;
}
- EXIT;
+ /*
+ * Only one entry by this name per-module, on failure the module
+ * shouldn't be deleted because we know it has at least one entry.
+ */
+ list_for_each_entry(tmp, &module->ksm_kstat_list, ks_list)
+ if (strncmp(tmp->ks_name, ksp->ks_name, KSTAT_STRLEN) == 0)
+ goto out;
+
+ list_add_tail(&ksp->ks_list, &module->ksm_kstat_list);
+
+ mutex_enter(ksp->ks_lock);
+ ksp->ks_owner = module;
+ ksp->ks_proc = proc_create_data(ksp->ks_name, 0644,
+ module->ksm_proc, &proc_kstat_operations, (void *)ksp);
+ if (ksp->ks_proc == NULL) {
+ list_del_init(&ksp->ks_list);
+ if (list_empty(&module->ksm_kstat_list))
+ kstat_delete_module(module);
+ }
+ mutex_exit(ksp->ks_lock);
+out:
+ mutex_exit(&kstat_module_lock);
}
EXPORT_SYMBOL(__kstat_install);
void
__kstat_delete(kstat_t *ksp)
{
- struct proc_dir_entry *de_module;
+ kstat_module_t *module = ksp->ks_owner;
- spin_lock(&kstat_lock);
- list_del_init(&ksp->ks_list);
- spin_unlock(&kstat_lock);
+ mutex_enter(&kstat_module_lock);
+ list_del_init(&ksp->ks_list);
+ mutex_exit(&kstat_module_lock);
- if (ksp->ks_proc) {
- de_module = ksp->ks_proc->parent;
- remove_proc_entry(ksp->ks_name, de_module);
+ if (ksp->ks_proc) {
+ remove_proc_entry(ksp->ks_name, module->ksm_proc);
- /* Remove top level module directory if it's empty */
- if (proc_dir_entries(de_module) == 0)
- remove_proc_entry(de_module->name, de_module->parent);
+ /* Remove top level module directory if it's empty */
+ if (list_empty(&module->ksm_kstat_list))
+ kstat_delete_module(module);
}
if (!(ksp->ks_flags & KSTAT_FLAG_VIRTUAL))
- kmem_free(ksp->ks_data, ksp->ks_data_size);
+ kmem_free(ksp->ks_data, ksp->ks_data_size);
+ ksp->ks_lock = NULL;
+ mutex_destroy(&ksp->ks_private_lock);
kmem_free(ksp, sizeof(*ksp));
return;
}
EXPORT_SYMBOL(__kstat_delete);
-#endif /* DEBUG_KSTAT */
-
int
-kstat_init(void)
+spl_kstat_init(void)
{
- ENTRY;
-#ifdef DEBUG_KSTAT
- spin_lock_init(&kstat_lock);
- INIT_LIST_HEAD(&kstat_list);
+ mutex_init(&kstat_module_lock, NULL, MUTEX_DEFAULT, NULL);
+ INIT_LIST_HEAD(&kstat_module_list);
kstat_id = 0;
-#endif /* DEBUG_KSTAT */
- RETURN(0);
+ return (0);
}
void
-kstat_fini(void)
+spl_kstat_fini(void)
{
- ENTRY;
-#ifdef DEBUG_KSTAT
- ASSERT(list_empty(&kstat_list));
-#endif /* DEBUG_KSTAT */
- EXIT;
+ ASSERT(list_empty(&kstat_module_list));
+ mutex_destroy(&kstat_module_lock);
}
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