Release 4.7 lib/fault-inject.c
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/random.h>
#include <linux/sched.h>
#include <linux/stat.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/stacktrace.h>
#include <linux/fault-inject.h>
/*
* setup_fault_attr() is a helper function for various __setup handlers, so it
* returns 0 on error, because that is what __setup handlers do.
*/
int setup_fault_attr(struct fault_attr *attr, char *str)
{
unsigned long probability;
unsigned long interval;
int times;
int space;
/* "<interval>,<probability>,<space>,<times>" */
if (sscanf(str, "%lu,%lu,%d,%d",
&interval, &probability, &space, ×) < 4) {
printk(KERN_WARNING
"FAULT_INJECTION: failed to parse arguments\n");
return 0;
}
attr->probability = probability;
attr->interval = interval;
atomic_set(&attr->times, times);
atomic_set(&attr->space, space);
return 1;
}
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| akinobu mita | akinobu mita | 98 | 100.00% | 1 | 100.00% |
| Total | 98 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(setup_fault_attr);
static void fail_dump(struct fault_attr *attr)
{
if (attr->verbose > 0 && __ratelimit(&attr->ratelimit_state)) {
printk(KERN_NOTICE "FAULT_INJECTION: forcing a failure.\n"
"name %pd, interval %lu, probability %lu, "
"space %d, times %d\n", attr->dname,
attr->interval, attr->probability,
atomic_read(&attr->space),
atomic_read(&attr->times));
if (attr->verbose > 1)
dump_stack();
}
}
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| Person | Tokens | Prop | Commits | CommitProp |
| dmitriy monakhov | dmitriy monakhov | 39 | 51.32% | 1 | 33.33% |
| akinobu mita | akinobu mita | 35 | 46.05% | 1 | 33.33% |
| florian westphal | florian westphal | 2 | 2.63% | 1 | 33.33% |
| Total | 76 | 100.00% | 3 | 100.00% |
#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
static bool fail_task(struct fault_attr *attr, struct task_struct *task)
{
return !in_interrupt() && task->make_it_fail;
}
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| akinobu mita | akinobu mita | 24 | 96.00% | 1 | 50.00% |
| don mullis | don mullis | 1 | 4.00% | 1 | 50.00% |
| Total | 25 | 100.00% | 2 | 100.00% |
#define MAX_STACK_TRACE_DEPTH 32
#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
static bool fail_stacktrace(struct fault_attr *attr)
{
struct stack_trace trace;
int depth = attr->stacktrace_depth;
unsigned long entries[MAX_STACK_TRACE_DEPTH];
int n;
bool found = (attr->require_start == 0 && attr->require_end == ULONG_MAX);
if (depth == 0)
return found;
trace.nr_entries = 0;
trace.entries = entries;
trace.max_entries = depth;
trace.skip = 1;
save_stack_trace(&trace);
for (n = 0; n < trace.nr_entries; n++) {
if (attr->reject_start <= entries[n] &&
entries[n] < attr->reject_end)
return false;
if (attr->require_start <= entries[n] &&
entries[n] < attr->require_end)
found = true;
}
return found;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| akinobu mita | akinobu mita | 152 | 98.06% | 1 | 50.00% |
| don mullis | don mullis | 3 | 1.94% | 1 | 50.00% |
| Total | 155 | 100.00% | 2 | 100.00% |
#else
static inline bool fail_stacktrace(struct fault_attr *attr)
{
return true;
}
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| Person | Tokens | Prop | Commits | CommitProp |
| akinobu mita | akinobu mita | 14 | 93.33% | 2 | 66.67% |
| don mullis | don mullis | 1 | 6.67% | 1 | 33.33% |
| Total | 15 | 100.00% | 3 | 100.00% |
#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
/*
* This code is stolen from failmalloc-1.0
* http://www.nongnu.org/failmalloc/
*/
bool should_fail(struct fault_attr *attr, ssize_t size)
{
/* No need to check any other properties if the probability is 0 */
if (attr->probability == 0)
return false;
if (attr->task_filter && !fail_task(attr, current))
return false;
if (atomic_read(&attr->times) == 0)
return false;
if (atomic_read(&attr->space) > size) {
atomic_sub(size, &attr->space);
return false;
}
if (attr->interval > 1) {
attr->count++;
if (attr->count % attr->interval)
return false;
}
if (attr->probability <= prandom_u32() % 100)
return false;
if (!fail_stacktrace(attr))
return false;
fail_dump(attr);
if (atomic_read(&attr->times) != -1)
atomic_dec_not_zero(&attr->times);
return true;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| akinobu mita | akinobu mita | 135 | 81.33% | 3 | 50.00% |
| don mullis | don mullis | 19 | 11.45% | 2 | 33.33% |
| anton blanchard | anton blanchard | 12 | 7.23% | 1 | 16.67% |
| Total | 166 | 100.00% | 6 | 100.00% |
EXPORT_SYMBOL_GPL(should_fail);
#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
static int debugfs_ul_set(void *data, u64 val)
{
*(unsigned long *)data = val;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| akinobu mita | akinobu mita | 22 | 84.62% | 1 | 50.00% |
| christoph hellwig | christoph hellwig | 4 | 15.38% | 1 | 50.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
static int debugfs_ul_get(void *data, u64 *val)
{
*val = *(unsigned long *)data;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| akinobu mita | akinobu mita | 17 | 60.71% | 1 | 50.00% |
| christoph hellwig | christoph hellwig | 11 | 39.29% | 1 | 50.00% |
| Total | 28 | 100.00% | 2 | 100.00% |
DEFINE_SIMPLE_ATTRIBUTE(fops_ul, debugfs_ul_get, debugfs_ul_set, "%llu\n");
static struct dentry *debugfs_create_ul(const char *name, umode_t mode,
struct dentry *parent, unsigned long *value)
{
return debugfs_create_file(name, mode, parent, value, &fops_ul);
}
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| Person | Tokens | Prop | Commits | CommitProp |
| akinobu mita | akinobu mita | 40 | 97.56% | 1 | 50.00% |
| al viro | al viro | 1 | 2.44% | 1 | 50.00% |
| Total | 41 | 100.00% | 2 | 100.00% |
#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
static int debugfs_stacktrace_depth_set(void *data, u64 val)
{
*(unsigned long *)data =
min_t(unsigned long, val, MAX_STACK_TRACE_DEPTH);
return 0;
}
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| Person | Tokens | Prop | Commits | CommitProp |
| akinobu mita | akinobu mita | 33 | 100.00% | 1 | 100.00% |
| Total | 33 | 100.00% | 1 | 100.00% |
DEFINE_SIMPLE_ATTRIBUTE(fops_stacktrace_depth, debugfs_ul_get,
debugfs_stacktrace_depth_set, "%llu\n");
static struct dentry *debugfs_create_stacktrace_depth(
const char *name, umode_t mode,
struct dentry *parent, unsigned long *value)
{
return debugfs_create_file(name, mode, parent, value,
&fops_stacktrace_depth);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| don mullis | don mullis | 38 | 92.68% | 1 | 33.33% |
| akinobu mita | akinobu mita | 2 | 4.88% | 1 | 33.33% |
| al viro | al viro | 1 | 2.44% | 1 | 33.33% |
| Total | 41 | 100.00% | 3 | 100.00% |
#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
struct dentry *fault_create_debugfs_attr(const char *name,
struct dentry *parent, struct fault_attr *attr)
{
umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
struct dentry *dir;
dir = debugfs_create_dir(name, parent);
if (!dir)
return ERR_PTR(-ENOMEM);
if (!debugfs_create_ul("probability", mode, dir, &attr->probability))
goto fail;
if (!debugfs_create_ul("interval", mode, dir, &attr->interval))
goto fail;
if (!debugfs_create_atomic_t("times", mode, dir, &attr->times))
goto fail;
if (!debugfs_create_atomic_t("space", mode, dir, &attr->space))
goto fail;
if (!debugfs_create_ul("verbose", mode, dir, &attr->verbose))
goto fail;
if (!debugfs_create_u32("verbose_ratelimit_interval_ms", mode, dir,
&attr->ratelimit_state.interval))
goto fail;
if (!debugfs_create_u32("verbose_ratelimit_burst", mode, dir,
&attr->ratelimit_state.burst))
goto fail;
if (!debugfs_create_bool("task-filter", mode, dir, &attr->task_filter))
goto fail;
#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
if (!debugfs_create_stacktrace_depth("stacktrace-depth", mode, dir,
&attr->stacktrace_depth))
goto fail;
if (!debugfs_create_ul("require-start", mode, dir,
&attr->require_start))
goto fail;
if (!debugfs_create_ul("require-end", mode, dir, &attr->require_end))
goto fail;
if (!debugfs_create_ul("reject-start", mode, dir, &attr->reject_start))
goto fail;
if (!debugfs_create_ul("reject-end", mode, dir, &attr->reject_end))
goto fail;
#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
attr->dname = dget(dir);
return dir;
fail:
debugfs_remove_recursive(dir);
return ERR_PTR(-ENOMEM);
}
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| Person | Tokens | Prop | Commits | CommitProp |
| akinobu mita | akinobu mita | 299 | 84.70% | 7 | 77.78% |
| dmitriy monakhov | dmitriy monakhov | 53 | 15.01% | 1 | 11.11% |
| al viro | al viro | 1 | 0.28% | 1 | 11.11% |
| Total | 353 | 100.00% | 9 | 100.00% |
EXPORT_SYMBOL_GPL(fault_create_debugfs_attr);
#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| akinobu mita | akinobu mita | 936 | 80.69% | 8 | 38.10% |
| dmitriy monakhov | dmitriy monakhov | 92 | 7.93% | 1 | 4.76% |
| don mullis | don mullis | 75 | 6.47% | 3 | 14.29% |
| per forlin | per forlin | 15 | 1.29% | 2 | 9.52% |
| christoph hellwig | christoph hellwig | 15 | 1.29% | 1 | 4.76% |
| anton blanchard | anton blanchard | 12 | 1.03% | 1 | 4.76% |
| stephen rothwell | stephen rothwell | 6 | 0.52% | 1 | 4.76% |
| al viro | al viro | 3 | 0.26% | 1 | 4.76% |
| alexey dobriyan | alexey dobriyan | 3 | 0.26% | 1 | 4.76% |
| florian westphal | florian westphal | 2 | 0.17% | 1 | 4.76% |
| paul gortmaker | paul gortmaker | 1 | 0.09% | 1 | 4.76% |
| Total | 1160 | 100.00% | 21 | 100.00% |
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