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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677// SPDX-License-Identifier: GPL-2.0#include <linux/fault-inject.h>#include <linux/error-injection.h>#include <linux/debugfs.h>#include <linux/slab.h>#include <linux/mm.h>#include "slab.h"
static struct { struct fault_attr attr; bool ignore_gfp_reclaim; bool cache_filter;} failslab = { .attr = FAULT_ATTR_INITIALIZER, .ignore_gfp_reclaim = true, .cache_filter = false,};
int should_failslab(struct kmem_cache *s, gfp_t gfpflags){ int flags = 0;
/* No fault-injection for bootstrap cache */ if (unlikely(s == kmem_cache)) return 0;
if (gfpflags & __GFP_NOFAIL) return 0;
if (failslab.ignore_gfp_reclaim && (gfpflags & __GFP_DIRECT_RECLAIM)) return 0;
if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB)) return 0;
/* * In some cases, it expects to specify __GFP_NOWARN * to avoid printing any information(not just a warning), * thus avoiding deadlocks. See commit 6b9dbedbe349 for * details. */ if (gfpflags & __GFP_NOWARN) flags |= FAULT_NOWARN;
return should_fail_ex(&failslab.attr, s->object_size, flags) ? -ENOMEM : 0;}ALLOW_ERROR_INJECTION(should_failslab, ERRNO);
static int __init setup_failslab(char *str){ return setup_fault_attr(&failslab.attr, str);}__setup("failslab=", setup_failslab);
#ifdef CONFIG_FAULT_INJECTION_DEBUG_FSstatic int __init failslab_debugfs_init(void){ struct dentry *dir; umode_t mode = S_IFREG | 0600;
dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr); if (IS_ERR(dir)) return PTR_ERR(dir);
debugfs_create_bool("ignore-gfp-wait", mode, dir, &failslab.ignore_gfp_reclaim); debugfs_create_bool("cache-filter", mode, dir, &failslab.cache_filter);
return 0;}
late_initcall(failslab_debugfs_init);
#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */